From 7d871ab87d45e535d1512a5834b627cbbce2e66c Mon Sep 17 00:00:00 2001
From: jdgleaver
Date: Fri, 17 Sep 2021 10:37:49 +0100
Subject: Replace direct direct file access with VFS routines

---
 Makefile                                         |    1 +
 Makefile.common                                  |   14 +
 libretro-common/compat/compat_posix_string.c     |  104 +
 libretro-common/compat/compat_strcasestr.c       |   58 +
 libretro-common/compat/compat_strl.c             |   69 +
 libretro-common/compat/fopen_utf8.c              |   63 +
 libretro-common/encodings/encoding_utf.c         |  512 +++
 libretro-common/file/file_path.c                 | 1381 ++++++++
 libretro-common/file/file_path_io.c              |  151 +
 libretro-common/include/boolean.h                |    4 +-
 libretro-common/include/compat/fopen_utf8.h      |   34 +
 libretro-common/include/compat/msvc.h            |   24 +-
 libretro-common/include/compat/msvc/stdint.h     |    3 -
 libretro-common/include/compat/posix_string.h    |   60 +
 libretro-common/include/compat/strcasestr.h      |   48 +
 libretro-common/include/compat/strl.h            |   59 +
 libretro-common/include/encodings/utf.h          |   67 +
 libretro-common/include/file/file_path.h         |  538 +++
 libretro-common/include/libretro.h               | 3822 ++++++++++++++++++++++
 libretro-common/include/retro_assert.h           |   35 +
 libretro-common/include/retro_common_api.h       |  119 +
 libretro-common/include/retro_environment.h      |  114 +
 libretro-common/include/retro_inline.h           |    2 +-
 libretro-common/include/retro_miscellaneous.h    |   72 +-
 libretro-common/include/streams/file_stream.h    |  115 +
 libretro-common/include/string/stdstring.h       |  250 ++
 libretro-common/include/time/rtime.h             |   48 +
 libretro-common/include/vfs/vfs.h                |  111 +
 libretro-common/include/vfs/vfs_implementation.h |   76 +
 libretro-common/streams/file_stream.c            |  663 ++++
 libretro-common/streams/file_stream_transforms.c |  159 +
 libretro-common/string/stdstring.c               |  536 +++
 libretro-common/time/rtime.c                     |   81 +
 libretro-common/vfs/vfs_implementation.c         | 1335 ++++++++
 libretro.c                                       |   14 +
 source/memmap.c                                  |   46 +-
 36 files changed, 10743 insertions(+), 45 deletions(-)
 create mode 100644 libretro-common/compat/compat_posix_string.c
 create mode 100644 libretro-common/compat/compat_strcasestr.c
 create mode 100644 libretro-common/compat/compat_strl.c
 create mode 100644 libretro-common/compat/fopen_utf8.c
 create mode 100644 libretro-common/encodings/encoding_utf.c
 create mode 100644 libretro-common/file/file_path.c
 create mode 100644 libretro-common/file/file_path_io.c
 create mode 100644 libretro-common/include/compat/fopen_utf8.h
 create mode 100644 libretro-common/include/compat/posix_string.h
 create mode 100644 libretro-common/include/compat/strcasestr.h
 create mode 100644 libretro-common/include/compat/strl.h
 create mode 100644 libretro-common/include/encodings/utf.h
 create mode 100644 libretro-common/include/file/file_path.h
 create mode 100644 libretro-common/include/libretro.h
 create mode 100644 libretro-common/include/retro_assert.h
 create mode 100644 libretro-common/include/retro_common_api.h
 create mode 100644 libretro-common/include/retro_environment.h
 create mode 100644 libretro-common/include/streams/file_stream.h
 create mode 100644 libretro-common/include/string/stdstring.h
 create mode 100644 libretro-common/include/time/rtime.h
 create mode 100644 libretro-common/include/vfs/vfs.h
 create mode 100644 libretro-common/include/vfs/vfs_implementation.h
 create mode 100644 libretro-common/streams/file_stream.c
 create mode 100644 libretro-common/streams/file_stream_transforms.c
 create mode 100644 libretro-common/string/stdstring.c
 create mode 100644 libretro-common/time/rtime.c
 create mode 100644 libretro-common/vfs/vfs_implementation.c

diff --git a/Makefile b/Makefile
index b293853..500e62e 100644
--- a/Makefile
+++ b/Makefile
@@ -562,6 +562,7 @@ else
 		-Wno-sign-compare \
 		-Wno-unused-variable \
 		-Wno-unused-function \
+		-Wno-unused-parameter \
 		-Wno-uninitialized \
 		-Wno-strict-aliasing \
 		-Wno-overflow \
diff --git a/Makefile.common b/Makefile.common
index f122bce..eace189 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -50,6 +50,20 @@ endif
 
 ifeq ($(LOAD_FROM_MEMORY),1)
 	FLAGS += -DLOAD_FROM_MEMORY
+else ifneq ($(STATIC_LINKING), 1)
+	SOURCES_C += \
+		$(LIBRETRO_COMM_DIR)/compat/compat_posix_string.c \
+		$(LIBRETRO_COMM_DIR)/compat/compat_strcasestr.c \
+		$(LIBRETRO_COMM_DIR)/compat/compat_strl.c \
+		$(LIBRETRO_COMM_DIR)/compat/fopen_utf8.c \
+		$(LIBRETRO_COMM_DIR)/encodings/encoding_utf.c \
+		$(LIBRETRO_COMM_DIR)/file/file_path.c \
+		$(LIBRETRO_COMM_DIR)/file/file_path_io.c \
+		$(LIBRETRO_COMM_DIR)/streams/file_stream.c \
+		$(LIBRETRO_COMM_DIR)/streams/file_stream_transforms.c \
+		$(LIBRETRO_COMM_DIR)/string/stdstring.c \
+		$(LIBRETRO_COMM_DIR)/time/rtime.c \
+		$(LIBRETRO_COMM_DIR)/vfs/vfs_implementation.c
 endif
 
 ifeq ($(USE_OLD_COLOUR_OPS),1)
diff --git a/libretro-common/compat/compat_posix_string.c b/libretro-common/compat/compat_posix_string.c
new file mode 100644
index 0000000..6a2f07e
--- /dev/null
+++ b/libretro-common/compat/compat_posix_string.c
@@ -0,0 +1,104 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (compat_posix_string.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <ctype.h>
+
+#include <compat/posix_string.h>
+
+#ifdef _WIN32
+
+#undef strcasecmp
+#undef strdup
+#undef isblank
+#undef strtok_r
+#include <ctype.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <compat/strl.h>
+
+#include <string.h>
+
+int retro_strcasecmp__(const char *a, const char *b)
+{
+   while (*a && *b)
+   {
+      int a_ = tolower(*a);
+      int b_ = tolower(*b);
+
+      if (a_ != b_)
+         return a_ - b_;
+
+      a++;
+      b++;
+   }
+
+   return tolower(*a) - tolower(*b);
+}
+
+char *retro_strdup__(const char *orig)
+{
+   size_t len = strlen(orig) + 1;
+   char *ret  = (char*)malloc(len);
+   if (!ret)
+      return NULL;
+
+   strlcpy(ret, orig, len);
+   return ret;
+}
+
+int retro_isblank__(int c)
+{
+   return (c == ' ') || (c == '\t');
+}
+
+char *retro_strtok_r__(char *str, const char *delim, char **saveptr)
+{
+   char *first = NULL;
+   if (!saveptr || !delim)
+      return NULL;
+
+   if (str)
+      *saveptr = str;
+
+   do
+   {
+      char *ptr = NULL;
+      first = *saveptr;
+      while (*first && strchr(delim, *first))
+         *first++ = '\0';
+
+      if (*first == '\0')
+         return NULL;
+
+      ptr = first + 1;
+
+      while (*ptr && !strchr(delim, *ptr))
+         ptr++;
+
+      *saveptr = ptr + (*ptr ? 1 : 0);
+      *ptr     = '\0';
+   } while (strlen(first) == 0);
+
+   return first;
+}
+
+#endif
diff --git a/libretro-common/compat/compat_strcasestr.c b/libretro-common/compat/compat_strcasestr.c
new file mode 100644
index 0000000..4129dab
--- /dev/null
+++ b/libretro-common/compat/compat_strcasestr.c
@@ -0,0 +1,58 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (compat_strcasestr.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <ctype.h>
+
+#include <compat/strcasestr.h>
+
+/* Pretty much strncasecmp. */
+static int casencmp(const char *a, const char *b, size_t n)
+{
+   size_t i;
+
+   for (i = 0; i < n; i++)
+   {
+      int a_lower = tolower(a[i]);
+      int b_lower = tolower(b[i]);
+      if (a_lower != b_lower)
+         return a_lower - b_lower;
+   }
+
+   return 0;
+}
+
+char *strcasestr_retro__(const char *haystack, const char *needle)
+{
+   size_t i, search_off;
+   size_t hay_len    = strlen(haystack);
+   size_t needle_len = strlen(needle);
+
+   if (needle_len > hay_len)
+      return NULL;
+
+   search_off = hay_len - needle_len;
+   for (i = 0; i <= search_off; i++)
+      if (!casencmp(haystack + i, needle, needle_len))
+         return (char*)haystack + i;
+
+   return NULL;
+}
diff --git a/libretro-common/compat/compat_strl.c b/libretro-common/compat/compat_strl.c
new file mode 100644
index 0000000..3172310
--- /dev/null
+++ b/libretro-common/compat/compat_strl.c
@@ -0,0 +1,69 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (compat_strl.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <ctype.h>
+
+#include <compat/strl.h>
+
+/* Implementation of strlcpy()/strlcat() based on OpenBSD. */
+
+#ifndef __MACH__
+
+size_t strlcpy(char *dest, const char *source, size_t size)
+{
+   size_t src_size = 0;
+   size_t        n = size;
+
+   if (n)
+      while (--n && (*dest++ = *source++)) src_size++;
+
+   if (!n)
+   {
+      if (size) *dest = '\0';
+      while (*source++) src_size++;
+   }
+
+   return src_size;
+}
+
+size_t strlcat(char *dest, const char *source, size_t size)
+{
+   size_t len = strlen(dest);
+
+   dest += len;
+
+   if (len > size)
+      size = 0;
+   else
+      size -= len;
+
+   return len + strlcpy(dest, source, size);
+}
+#endif
+
+char *strldup(const char *s, size_t n)
+{
+   char *dst = (char*)malloc(sizeof(char) * (n + 1));
+   strlcpy(dst, s, n);
+   return dst;
+}
diff --git a/libretro-common/compat/fopen_utf8.c b/libretro-common/compat/fopen_utf8.c
new file mode 100644
index 0000000..85abb59
--- /dev/null
+++ b/libretro-common/compat/fopen_utf8.c
@@ -0,0 +1,63 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (fopen_utf8.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <compat/fopen_utf8.h>
+#include <encodings/utf.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500 || defined(_XBOX)
+#ifndef LEGACY_WIN32
+#define LEGACY_WIN32
+#endif
+#endif
+
+#ifdef _WIN32
+#undef fopen
+
+void *fopen_utf8(const char * filename, const char * mode)
+{
+#if defined(LEGACY_WIN32)
+   FILE             *ret = NULL;
+   char * filename_local = utf8_to_local_string_alloc(filename);
+
+   if (!filename_local)
+      return NULL;
+   ret = fopen(filename_local, mode);
+   if (filename_local)
+      free(filename_local);
+   return ret;
+#else
+   wchar_t * filename_w = utf8_to_utf16_string_alloc(filename);
+   wchar_t * mode_w = utf8_to_utf16_string_alloc(mode);
+   FILE* ret = NULL;
+
+   if (filename_w && mode_w)
+      ret = _wfopen(filename_w, mode_w);
+   if (filename_w)
+      free(filename_w);
+   if (mode_w)
+      free(mode_w);
+   return ret;
+#endif
+}
+#endif
diff --git a/libretro-common/encodings/encoding_utf.c b/libretro-common/encodings/encoding_utf.c
new file mode 100644
index 0000000..2760824
--- /dev/null
+++ b/libretro-common/encodings/encoding_utf.c
@@ -0,0 +1,512 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (encoding_utf.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <boolean.h>
+#include <compat/strl.h>
+#include <retro_inline.h>
+
+#include <encodings/utf.h>
+
+#if defined(_WIN32) && !defined(_XBOX)
+#include <windows.h>
+#elif defined(_XBOX)
+#include <xtl.h>
+#endif
+
+#define UTF8_WALKBYTE(string) (*((*(string))++))
+
+static unsigned leading_ones(uint8_t c)
+{
+   unsigned ones = 0;
+   while (c & 0x80)
+   {
+      ones++;
+      c <<= 1;
+   }
+
+   return ones;
+}
+
+/* Simple implementation. Assumes the sequence is
+ * properly synchronized and terminated. */
+
+size_t utf8_conv_utf32(uint32_t *out, size_t out_chars,
+      const char *in, size_t in_size)
+{
+   unsigned i;
+   size_t ret = 0;
+   while (in_size && out_chars)
+   {
+      unsigned extra, shift;
+      uint32_t c;
+      uint8_t first = *in++;
+      unsigned ones = leading_ones(first);
+
+      if (ones > 6 || ones == 1) /* Invalid or desync. */
+         break;
+
+      extra = ones ? ones - 1 : ones;
+      if (1 + extra > in_size) /* Overflow. */
+         break;
+
+      shift = (extra - 1) * 6;
+      c     = (first & ((1 << (7 - ones)) - 1)) << (6 * extra);
+
+      for (i = 0; i < extra; i++, in++, shift -= 6)
+         c |= (*in & 0x3f) << shift;
+
+      *out++ = c;
+      in_size -= 1 + extra;
+      out_chars--;
+      ret++;
+   }
+
+   return ret;
+}
+
+bool utf16_conv_utf8(uint8_t *out, size_t *out_chars,
+     const uint16_t *in, size_t in_size)
+{
+   size_t out_pos            = 0;
+   size_t in_pos             = 0;
+   static const 
+      uint8_t utf8_limits[5] = { 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
+
+   for (;;)
+   {
+      unsigned num_adds;
+      uint32_t value;
+
+      if (in_pos == in_size)
+      {
+         *out_chars = out_pos;
+         return true;
+      }
+      value = in[in_pos++];
+      if (value < 0x80)
+      {
+         if (out)
+            out[out_pos] = (char)value;
+         out_pos++;
+         continue;
+      }
+
+      if (value >= 0xD800 && value < 0xE000)
+      {
+         uint32_t c2;
+
+         if (value >= 0xDC00 || in_pos == in_size)
+            break;
+         c2 = in[in_pos++];
+         if (c2 < 0xDC00 || c2 >= 0xE000)
+            break;
+         value = (((value - 0xD800) << 10) | (c2 - 0xDC00)) + 0x10000;
+      }
+
+      for (num_adds = 1; num_adds < 5; num_adds++)
+         if (value < (((uint32_t)1) << (num_adds * 5 + 6)))
+            break;
+      if (out)
+         out[out_pos] = (char)(utf8_limits[num_adds - 1]
+               + (value >> (6 * num_adds)));
+      out_pos++;
+      do
+      {
+         num_adds--;
+         if (out)
+            out[out_pos] = (char)(0x80
+                  + ((value >> (6 * num_adds)) & 0x3F));
+         out_pos++;
+      }while (num_adds != 0);
+   }
+
+   *out_chars = out_pos;
+   return false;
+}
+
+/* Acts mostly like strlcpy.
+ *
+ * Copies the given number of UTF-8 characters,
+ * but at most d_len bytes.
+ *
+ * Always NULL terminates.
+ * Does not copy half a character.
+ *
+ * Returns number of bytes. 's' is assumed valid UTF-8.
+ * Use only if 'chars' is considerably less than 'd_len'. */
+size_t utf8cpy(char *d, size_t d_len, const char *s, size_t chars)
+{
+   const uint8_t *sb     = (const uint8_t*)s;
+   const uint8_t *sb_org = sb;
+
+   if (!s)
+      return 0;
+
+   while (*sb && chars-- > 0)
+   {
+      sb++;
+      while ((*sb & 0xC0) == 0x80)
+         sb++;
+   }
+
+   if ((size_t)(sb - sb_org) > d_len-1 /* NUL */)
+   {
+      sb = sb_org + d_len-1;
+      while ((*sb & 0xC0) == 0x80)
+         sb--;
+   }
+
+   memcpy(d, sb_org, sb-sb_org);
+   d[sb-sb_org] = '\0';
+
+   return sb-sb_org;
+}
+
+const char *utf8skip(const char *str, size_t chars)
+{
+   const uint8_t *strb = (const uint8_t*)str;
+
+   if (!chars)
+      return str;
+
+   do
+   {
+      strb++;
+      while ((*strb & 0xC0)==0x80)
+         strb++;
+      chars--;
+   }while (chars);
+
+   return (const char*)strb;
+}
+
+size_t utf8len(const char *string)
+{
+   size_t ret = 0;
+
+   if (!string)
+      return 0;
+
+   while (*string)
+   {
+      if ((*string & 0xC0) != 0x80)
+         ret++;
+      string++;
+   }
+   return ret;
+}
+
+/* Does not validate the input, returns garbage if it's not UTF-8. */
+uint32_t utf8_walk(const char **string)
+{
+   uint8_t first = UTF8_WALKBYTE(string);
+   uint32_t ret  = 0;
+
+   if (first < 128)
+      return first;
+
+   ret    = (ret << 6) | (UTF8_WALKBYTE(string) & 0x3F);
+   if (first >= 0xE0)
+   {
+      ret = (ret << 6) | (UTF8_WALKBYTE(string) & 0x3F);
+      if (first >= 0xF0)
+      {
+         ret = (ret << 6) | (UTF8_WALKBYTE(string) & 0x3F);
+         return ret | (first & 7) << 18;
+      }
+      return ret | (first & 15) << 12;
+   }
+
+   return ret | (first & 31) << 6;
+}
+
+static bool utf16_to_char(uint8_t **utf_data,
+      size_t *dest_len, const uint16_t *in)
+{
+   unsigned len    = 0;
+
+   while (in[len] != '\0')
+      len++;
+
+   utf16_conv_utf8(NULL, dest_len, in, len);
+   *dest_len  += 1;
+   *utf_data   = (uint8_t*)malloc(*dest_len);
+   if (*utf_data == 0)
+      return false;
+
+   return utf16_conv_utf8(*utf_data, dest_len, in, len);
+}
+
+bool utf16_to_char_string(const uint16_t *in, char *s, size_t len)
+{
+   size_t     dest_len  = 0;
+   uint8_t *utf16_data  = NULL;
+   bool            ret  = utf16_to_char(&utf16_data, &dest_len, in);
+
+   if (ret)
+   {
+      utf16_data[dest_len] = 0;
+      strlcpy(s, (const char*)utf16_data, len);
+   }
+
+   free(utf16_data);
+   utf16_data = NULL;
+
+   return ret;
+}
+
+#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
+/* Returned pointer MUST be freed by the caller if non-NULL. */
+static char *mb_to_mb_string_alloc(const char *str,
+      enum CodePage cp_in, enum CodePage cp_out)
+{
+   wchar_t *path_buf_wide = NULL;
+   int path_buf_wide_len  = MultiByteToWideChar(cp_in, 0, str, -1, NULL, 0);
+
+   /* Windows 95 will return 0 from these functions with 
+    * a UTF8 codepage set without MSLU.
+    *
+    * From an unknown MSDN version (others omit this info):
+    *   - CP_UTF8 Windows 98/Me, Windows NT 4.0 and later: 
+    *   Translate using UTF-8. When this is set, dwFlags must be zero.
+    *   - Windows 95: Under the Microsoft Layer for Unicode, 
+    *   MultiByteToWideChar also supports CP_UTF7 and CP_UTF8.
+    */
+
+   if (!path_buf_wide_len)
+      return strdup(str);
+
+   path_buf_wide = (wchar_t*)
+      calloc(path_buf_wide_len + sizeof(wchar_t), sizeof(wchar_t));
+
+   if (path_buf_wide)
+   {
+      MultiByteToWideChar(cp_in, 0,
+            str, -1, path_buf_wide, path_buf_wide_len);
+
+      if (*path_buf_wide)
+      {
+         int path_buf_len = WideCharToMultiByte(cp_out, 0,
+               path_buf_wide, -1, NULL, 0, NULL, NULL);
+
+         if (path_buf_len)
+         {
+            char *path_buf = (char*)
+               calloc(path_buf_len + sizeof(char), sizeof(char));
+
+            if (path_buf)
+            {
+               WideCharToMultiByte(cp_out, 0,
+                     path_buf_wide, -1, path_buf,
+                     path_buf_len, NULL, NULL);
+
+               free(path_buf_wide);
+
+               if (*path_buf)
+                  return path_buf;
+
+               free(path_buf);
+               return NULL;
+            }
+         }
+         else
+         {
+            free(path_buf_wide);
+            return strdup(str);
+         }
+      }
+
+      free(path_buf_wide);
+   }
+
+   return NULL;
+}
+#endif
+
+/* Returned pointer MUST be freed by the caller if non-NULL. */
+char* utf8_to_local_string_alloc(const char *str)
+{
+   if (str && *str)
+   {
+#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
+      return mb_to_mb_string_alloc(str, CODEPAGE_UTF8, CODEPAGE_LOCAL);
+#else
+      /* assume string needs no modification if not on Windows */
+      return strdup(str);
+#endif
+   }
+   return NULL;
+}
+
+/* Returned pointer MUST be freed by the caller if non-NULL. */
+char* local_to_utf8_string_alloc(const char *str)
+{
+   if (str && *str)
+   {
+#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
+      return mb_to_mb_string_alloc(str, CODEPAGE_LOCAL, CODEPAGE_UTF8);
+#else
+      /* assume string needs no modification if not on Windows */
+      return strdup(str);
+#endif
+   }
+   return NULL;
+}
+
+/* Returned pointer MUST be freed by the caller if non-NULL. */
+wchar_t* utf8_to_utf16_string_alloc(const char *str)
+{
+#ifdef _WIN32
+   int len        = 0;
+   int out_len    = 0;
+#else
+   size_t len     = 0;
+   size_t out_len = 0;
+#endif
+   wchar_t *buf   = NULL;
+
+   if (!str || !*str)
+      return NULL;
+
+#ifdef _WIN32
+   len = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
+
+   if (len)
+   {
+      buf = (wchar_t*)calloc(len, sizeof(wchar_t));
+
+      if (!buf)
+         return NULL;
+
+      out_len = MultiByteToWideChar(CP_UTF8, 0, str, -1, buf, len);
+   }
+   else
+   {
+      /* fallback to ANSI codepage instead */
+      len = MultiByteToWideChar(CP_ACP, 0, str, -1, NULL, 0);
+
+      if (len)
+      {
+         buf = (wchar_t*)calloc(len, sizeof(wchar_t));
+
+         if (!buf)
+            return NULL;
+
+         out_len = MultiByteToWideChar(CP_ACP, 0, str, -1, buf, len);
+      }
+   }
+
+   if (out_len < 0)
+   {
+      free(buf);
+      return NULL;
+   }
+#else
+   /* NOTE: For now, assume non-Windows platforms' locale is already UTF-8. */
+   len = mbstowcs(NULL, str, 0) + 1;
+
+   if (len)
+   {
+      buf = (wchar_t*)calloc(len, sizeof(wchar_t));
+
+      if (!buf)
+         return NULL;
+
+      out_len = mbstowcs(buf, str, len);
+   }
+
+   if (out_len == (size_t)-1)
+   {
+      free(buf);
+      return NULL;
+   }
+#endif
+
+   return buf;
+}
+
+/* Returned pointer MUST be freed by the caller if non-NULL. */
+char* utf16_to_utf8_string_alloc(const wchar_t *str)
+{
+#ifdef _WIN32
+   int len        = 0;
+#else
+   size_t len     = 0;
+#endif
+   char *buf      = NULL;
+
+   if (!str || !*str)
+      return NULL;
+
+#ifdef _WIN32
+   {
+      UINT code_page = CP_UTF8;
+      len            = WideCharToMultiByte(code_page,
+            0, str, -1, NULL, 0, NULL, NULL);
+
+      /* fallback to ANSI codepage instead */
+      if (!len)
+      {
+         code_page   = CP_ACP;
+         len         = WideCharToMultiByte(code_page,
+               0, str, -1, NULL, 0, NULL, NULL);
+      }
+
+      buf = (char*)calloc(len, sizeof(char));
+
+      if (!buf)
+         return NULL;
+
+      if (WideCharToMultiByte(code_page,
+            0, str, -1, buf, len, NULL, NULL) < 0)
+      {
+         free(buf);
+         return NULL;
+      }
+   }
+#else
+   /* NOTE: For now, assume non-Windows platforms' 
+    * locale is already UTF-8. */
+   len = wcstombs(NULL, str, 0) + 1;
+
+   if (len)
+   {
+      buf = (char*)calloc(len, sizeof(char));
+
+      if (!buf)
+         return NULL;
+
+      if (wcstombs(buf, str, len) == (size_t)-1)
+      {
+         free(buf);
+         return NULL;
+      }
+   }
+#endif
+
+   return buf;
+}
diff --git a/libretro-common/file/file_path.c b/libretro-common/file/file_path.c
new file mode 100644
index 0000000..fc11270
--- /dev/null
+++ b/libretro-common/file/file_path.c
@@ -0,0 +1,1381 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (file_path.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+
+#include <sys/stat.h>
+
+#include <boolean.h>
+#include <file/file_path.h>
+#include <retro_assert.h>
+#include <string/stdstring.h>
+#include <time/rtime.h>
+
+/* TODO: There are probably some unnecessary things on this huge include list now but I'm too afraid to touch it */
+#ifdef __APPLE__
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+#ifdef __HAIKU__
+#include <kernel/image.h>
+#endif
+#ifndef __MACH__
+#include <compat/strl.h>
+#include <compat/posix_string.h>
+#endif
+#include <retro_miscellaneous.h>
+#include <encodings/utf.h>
+
+#ifdef _WIN32
+#include <direct.h>
+#else
+#include <unistd.h> /* stat() is defined here */
+#endif
+
+#if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
+#ifdef __WINRT__
+#include <uwp/uwp_func.h>
+#endif
+#endif
+
+/* Assume W-functions do not work below Win2K and Xbox platforms */
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500 || defined(_XBOX)
+
+#ifndef LEGACY_WIN32
+#define LEGACY_WIN32
+#endif
+
+#endif
+
+/**
+ * path_get_archive_delim:
+ * @path               : path
+ *
+ * Find delimiter of an archive file. Only the first '#'
+ * after a compression extension is considered.
+ *
+ * Returns: pointer to the delimiter in the path if it contains
+ * a path inside a compressed file, otherwise NULL.
+ */
+const char *path_get_archive_delim(const char *path)
+{
+   const char *last_slash = find_last_slash(path);
+   const char *delim      = NULL;
+   char buf[5];
+
+   buf[0] = '\0';
+
+   /* We search for delimiters after the last slash
+    * in the file path to avoid capturing delimiter
+    * characters in any parent directory names.
+    * If there are no slashes in the file name, then
+    * the path is just the file basename - in this
+    * case we search the path in its entirety */
+   if (!last_slash)
+      last_slash = path;
+
+   /* Find delimiter position
+    * > Since filenames may contain '#' characters,
+    *   must loop until we find the first '#' that
+    *   is directly *after* a compression extension */
+   delim = strchr(last_slash, '#');
+
+   while (delim)
+   {
+      /* Check whether this is a known archive type
+       * > Note: The code duplication here is
+       *   deliberate, to maximise performance */
+      if (delim - last_slash > 4)
+      {
+         strlcpy(buf, delim - 4, sizeof(buf));
+         buf[4] = '\0';
+
+         string_to_lower(buf);
+
+         /* Check if this is a '.zip', '.apk' or '.7z' file */
+         if (string_is_equal(buf,     ".zip") ||
+             string_is_equal(buf,     ".apk") ||
+             string_is_equal(buf + 1, ".7z"))
+            return delim;
+      }
+      else if (delim - last_slash > 3)
+      {
+         strlcpy(buf, delim - 3, sizeof(buf));
+         buf[3] = '\0';
+
+         string_to_lower(buf);
+
+         /* Check if this is a '.7z' file */
+         if (string_is_equal(buf, ".7z"))
+            return delim;
+      }
+
+      delim++;
+      delim = strchr(delim, '#');
+   }
+
+   return NULL;
+}
+
+/**
+ * path_get_extension:
+ * @path               : path
+ *
+ * Gets extension of file. Only '.'s
+ * after the last slash are considered.
+ *
+ * Returns: extension part from the path.
+ */
+const char *path_get_extension(const char *path)
+{
+   const char *ext;
+   if (!string_is_empty(path) && ((ext = strrchr(path_basename(path), '.'))))
+      return ext + 1;
+   return "";
+}
+
+/**
+ * path_remove_extension:
+ * @path               : path
+ *
+ * Mutates path by removing its extension. Removes all
+ * text after and including the last '.'.
+ * Only '.'s after the last slash are considered.
+ *
+ * Returns:
+ * 1) If path has an extension, returns path with the
+ *    extension removed.
+ * 2) If there is no extension, returns NULL.
+ * 3) If path is empty or NULL, returns NULL
+ */
+char *path_remove_extension(char *path)
+{
+   char *last = !string_is_empty(path)
+      ? (char*)strrchr(path_basename(path), '.') : NULL;
+   if (!last)
+      return NULL;
+   if (*last)
+      *last = '\0';
+   return path;
+}
+
+/**
+ * path_is_compressed_file:
+ * @path               : path
+ *
+ * Checks if path is a compressed file.
+ *
+ * Returns: true (1) if path is a compressed file, otherwise false (0).
+ **/
+bool path_is_compressed_file(const char* path)
+{
+   const char *ext = path_get_extension(path);
+   if (!string_is_empty(ext))
+      if (  string_is_equal_noncase(ext, "zip") ||
+            string_is_equal_noncase(ext, "apk") ||
+            string_is_equal_noncase(ext, "7z"))
+         return true;
+   return false;
+}
+
+/**
+ * fill_pathname:
+ * @out_path           : output path
+ * @in_path            : input  path
+ * @replace            : what to replace
+ * @size               : buffer size of output path
+ *
+ * FIXME: Verify
+ *
+ * Replaces filename extension with 'replace' and outputs result to out_path.
+ * The extension here is considered to be the string from the last '.'
+ * to the end.
+ *
+ * Only '.'s after the last slash are considered as extensions.
+ * If no '.' is present, in_path and replace will simply be concatenated.
+ * 'size' is buffer size of 'out_path'.
+ * E.g.: in_path = "/foo/bar/baz/boo.c", replace = ".asm" =>
+ * out_path = "/foo/bar/baz/boo.asm"
+ * E.g.: in_path = "/foo/bar/baz/boo.c", replace = ""     =>
+ * out_path = "/foo/bar/baz/boo"
+ */
+void fill_pathname(char *out_path, const char *in_path,
+      const char *replace, size_t size)
+{
+   char tmp_path[PATH_MAX_LENGTH];
+   char *tok                      = NULL;
+
+   tmp_path[0] = '\0';
+
+   strlcpy(tmp_path, in_path, sizeof(tmp_path));
+   if ((tok = (char*)strrchr(path_basename(tmp_path), '.')))
+      *tok = '\0';
+
+   fill_pathname_noext(out_path, tmp_path, replace, size);
+}
+
+/**
+ * fill_pathname_noext:
+ * @out_path           : output path
+ * @in_path            : input  path
+ * @replace            : what to replace
+ * @size               : buffer size of output path
+ *
+ * Appends a filename extension 'replace' to 'in_path', and outputs
+ * result in 'out_path'.
+ *
+ * Assumes in_path has no extension. If an extension is still
+ * present in 'in_path', it will be ignored.
+ *
+ */
+size_t fill_pathname_noext(char *out_path, const char *in_path,
+      const char *replace, size_t size)
+{
+   strlcpy(out_path, in_path, size);
+   return strlcat(out_path, replace, size);
+}
+
+char *find_last_slash(const char *str)
+{
+   const char *slash     = strrchr(str, '/');
+#ifdef _WIN32
+   const char *backslash = strrchr(str, '\\');
+
+   if (!slash || (backslash > slash))
+      return (char*)backslash;
+#endif
+   return (char*)slash;
+}
+
+/**
+ * fill_pathname_slash:
+ * @path               : path
+ * @size               : size of path
+ *
+ * Assumes path is a directory. Appends a slash
+ * if not already there.
+ **/
+void fill_pathname_slash(char *path, size_t size)
+{
+   size_t path_len;
+   const char *last_slash = find_last_slash(path);
+
+   if (!last_slash)
+   {
+      strlcat(path, PATH_DEFAULT_SLASH(), size);
+      return;
+   }
+
+   path_len               = strlen(path);
+   /* Try to preserve slash type. */
+   if (last_slash != (path + path_len - 1))
+   {
+      path[path_len]   = last_slash[0];
+      path[path_len+1] = '\0';
+   }
+}
+
+/**
+ * fill_pathname_dir:
+ * @in_dir             : input directory path
+ * @in_basename        : input basename to be appended to @in_dir
+ * @replace            : replacement to be appended to @in_basename
+ * @size               : size of buffer
+ *
+ * Appends basename of 'in_basename', to 'in_dir', along with 'replace'.
+ * Basename of in_basename is the string after the last '/' or '\\',
+ * i.e the filename without directories.
+ *
+ * If in_basename has no '/' or '\\', the whole 'in_basename' will be used.
+ * 'size' is buffer size of 'in_dir'.
+ *
+ * E.g..: in_dir = "/tmp/some_dir", in_basename = "/some_content/foo.c",
+ * replace = ".asm" => in_dir = "/tmp/some_dir/foo.c.asm"
+ **/
+size_t fill_pathname_dir(char *in_dir, const char *in_basename,
+      const char *replace, size_t size)
+{
+   const char *base = NULL;
+
+   fill_pathname_slash(in_dir, size);
+   base = path_basename(in_basename);
+   strlcat(in_dir, base, size);
+   return strlcat(in_dir, replace, size);
+}
+
+/**
+ * fill_pathname_base:
+ * @out                : output path
+ * @in_path            : input path
+ * @size               : size of output path
+ *
+ * Copies basename of @in_path into @out_path.
+ **/
+size_t fill_pathname_base(char *out, const char *in_path, size_t size)
+{
+   const char     *ptr = path_basename(in_path);
+
+   if (!ptr)
+      ptr = in_path;
+
+   return strlcpy(out, ptr, size);
+}
+
+void fill_pathname_base_noext(char *out,
+      const char *in_path, size_t size)
+{
+   fill_pathname_base(out, in_path, size);
+   path_remove_extension(out);
+}
+
+size_t fill_pathname_base_ext(char *out,
+      const char *in_path, const char *ext,
+      size_t size)
+{
+   fill_pathname_base_noext(out, in_path, size);
+   return strlcat(out, ext, size);
+}
+
+/**
+ * fill_pathname_basedir:
+ * @out_dir            : output directory
+ * @in_path            : input path
+ * @size               : size of output directory
+ *
+ * Copies base directory of @in_path into @out_path.
+ * If in_path is a path without any slashes (relative current directory),
+ * @out_path will get path "./".
+ **/
+void fill_pathname_basedir(char *out_dir,
+      const char *in_path, size_t size)
+{
+   if (out_dir != in_path)
+      strlcpy(out_dir, in_path, size);
+   path_basedir(out_dir);
+}
+
+void fill_pathname_basedir_noext(char *out_dir,
+      const char *in_path, size_t size)
+{
+   fill_pathname_basedir(out_dir, in_path, size);
+   path_remove_extension(out_dir);
+}
+
+/**
+ * fill_pathname_parent_dir_name:
+ * @out_dir            : output directory
+ * @in_dir             : input directory
+ * @size               : size of output directory
+ *
+ * Copies only the parent directory name of @in_dir into @out_dir.
+ * The two buffers must not overlap. Removes trailing '/'.
+ * Returns true on success, false if a slash was not found in the path.
+ **/
+bool fill_pathname_parent_dir_name(char *out_dir,
+      const char *in_dir, size_t size)
+{
+   bool success = false;
+   char *temp   = strdup(in_dir);
+   char *last   = find_last_slash(temp);
+
+   if (last && last[1] == 0)
+   {
+      *last     = '\0';
+      last      = find_last_slash(temp);
+   }
+
+   if (last)
+      *last     = '\0';
+
+   in_dir       = find_last_slash(temp);
+
+   success      = in_dir && in_dir[1];
+
+   if (success)
+      strlcpy(out_dir, in_dir + 1, size);
+
+   free(temp);
+   return success;
+}
+
+/**
+ * fill_pathname_parent_dir:
+ * @out_dir            : output directory
+ * @in_dir             : input directory
+ * @size               : size of output directory
+ *
+ * Copies parent directory of @in_dir into @out_dir.
+ * Assumes @in_dir is a directory. Keeps trailing '/'.
+ * If the path was already at the root directory, @out_dir will be an empty string.
+ **/
+void fill_pathname_parent_dir(char *out_dir,
+      const char *in_dir, size_t size)
+{
+   if (out_dir != in_dir)
+      strlcpy(out_dir, in_dir, size);
+   path_parent_dir(out_dir);
+}
+
+/**
+ * fill_dated_filename:
+ * @out_filename       : output filename
+ * @ext                : extension of output filename
+ * @size               : buffer size of output filename
+ *
+ * Creates a 'dated' filename prefixed by 'RetroArch', and
+ * concatenates extension (@ext) to it.
+ *
+ * E.g.:
+ * out_filename = "RetroArch-{month}{day}-{Hours}{Minutes}.{@ext}"
+ **/
+size_t fill_dated_filename(char *out_filename,
+      const char *ext, size_t size)
+{
+   time_t cur_time = time(NULL);
+   struct tm tm_;
+
+   rtime_localtime(&cur_time, &tm_);
+
+   strftime(out_filename, size,
+         "RetroArch-%m%d-%H%M%S", &tm_);
+   return strlcat(out_filename, ext, size);
+}
+
+/**
+ * fill_str_dated_filename:
+ * @out_filename       : output filename
+ * @in_str             : input string
+ * @ext                : extension of output filename
+ * @size               : buffer size of output filename
+ *
+ * Creates a 'dated' filename prefixed by the string @in_str, and
+ * concatenates extension (@ext) to it.
+ *
+ * E.g.:
+ * out_filename = "RetroArch-{year}{month}{day}-{Hour}{Minute}{Second}.{@ext}"
+ **/
+void fill_str_dated_filename(char *out_filename,
+      const char *in_str, const char *ext, size_t size)
+{
+   char format[256];
+   struct tm tm_;
+   time_t cur_time = time(NULL);
+
+   format[0]       = '\0';
+
+   rtime_localtime(&cur_time, &tm_);
+
+   if (string_is_empty(ext))
+   {
+      strftime(format, sizeof(format), "-%y%m%d-%H%M%S", &tm_);
+      fill_pathname_noext(out_filename, in_str, format, size);
+   }
+   else
+   {
+      strftime(format, sizeof(format), "-%y%m%d-%H%M%S.", &tm_);
+
+      fill_pathname_join_concat_noext(out_filename,
+            in_str, format, ext,
+            size);
+   }
+}
+
+/**
+ * path_basedir:
+ * @path               : path
+ *
+ * Extracts base directory by mutating path.
+ * Keeps trailing '/'.
+ **/
+void path_basedir(char *path)
+{
+   char *last = NULL;
+
+   if (strlen(path) < 2)
+      return;
+
+   last = find_last_slash(path);
+
+   if (last)
+      last[1] = '\0';
+   else
+      strlcpy(path, "." PATH_DEFAULT_SLASH(), 3);
+}
+
+/**
+ * path_parent_dir:
+ * @path               : path
+ *
+ * Extracts parent directory by mutating path.
+ * Assumes that path is a directory. Keeps trailing '/'.
+ * If the path was already at the root directory, returns empty string
+ **/
+void path_parent_dir(char *path)
+{
+   size_t len = 0;
+
+   if (!path)
+      return;
+   
+   len = strlen(path);
+
+   if (len && PATH_CHAR_IS_SLASH(path[len - 1]))
+   {
+      bool path_was_absolute = path_is_absolute(path);
+
+      path[len - 1] = '\0';
+
+      if (path_was_absolute && !find_last_slash(path))
+      {
+         /* We removed the only slash from what used to be an absolute path.
+          * On Linux, this goes from "/" to an empty string and everything works fine,
+          * but on Windows, we went from C:\ to C:, which is not a valid path and that later
+          * gets errornously treated as a relative one by path_basedir and returns "./".
+          * What we really wanted is an empty string. */
+         path[0] = '\0';
+         return;
+      }
+   }
+   path_basedir(path);
+}
+
+/**
+ * path_basename:
+ * @path               : path
+ *
+ * Get basename from @path.
+ *
+ * Returns: basename from path.
+ **/
+const char *path_basename(const char *path)
+{
+   /* We cut at the first compression-related hash */
+   const char *delim = path_get_archive_delim(path);
+   if (delim)
+      return delim + 1;
+
+   {
+      /* We cut at the last slash */
+      const char *last  = find_last_slash(path);
+      if (last)
+         return last + 1;
+   }
+
+   return path;
+}
+
+/* Specialized version */
+const char *path_basename_nocompression(const char *path)
+{
+   /* We cut at the last slash */
+   const char *last  = find_last_slash(path);
+   if (last)
+      return last + 1;
+   return path;
+}
+
+/**
+ * path_is_absolute:
+ * @path               : path
+ *
+ * Checks if @path is an absolute path or a relative path.
+ *
+ * Returns: true if path is absolute, false if path is relative.
+ **/
+bool path_is_absolute(const char *path)
+{
+   if (string_is_empty(path))
+      return false;
+
+   if (path[0] == '/')
+      return true;
+
+#if defined(_WIN32)
+   /* Many roads lead to Rome...
+    * Note: Drive letter can only be 1 character long */
+   if (string_starts_with_size(path,     "\\\\", STRLEN_CONST("\\\\")) ||
+       string_starts_with_size(path + 1, ":/",   STRLEN_CONST(":/"))   ||
+       string_starts_with_size(path + 1, ":\\",  STRLEN_CONST(":\\")))
+      return true;
+#elif defined(__wiiu__) || defined(VITA)
+   {
+      const char *seperator = strchr(path, ':');
+      if (seperator && (seperator[1] == '/'))
+         return true;
+   }
+#endif
+
+   return false;
+}
+
+/**
+ * path_resolve_realpath:
+ * @buf                : input and output buffer for path
+ * @size               : size of buffer
+ * @resolve_symlinks   : whether to resolve symlinks or not
+ *
+ * Resolves use of ".", "..", multiple slashes etc in absolute paths.
+ *
+ * Relative paths are rebased on the current working dir.
+ *
+ * Returns: @buf if successful, NULL otherwise.
+ * Note: Not implemented on consoles
+ * Note: Symlinks are only resolved on Unix-likes
+ * Note: The current working dir might not be what you expect,
+ *       e.g. on Android it is "/"
+ *       Use of fill_pathname_resolve_relative() should be prefered
+ **/
+char *path_resolve_realpath(char *buf, size_t size, bool resolve_symlinks)
+{
+#if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
+#ifdef _WIN32
+   char *ret = NULL;
+   wchar_t abs_path[PATH_MAX_LENGTH];
+   wchar_t *rel_path = utf8_to_utf16_string_alloc(buf);
+
+   if (rel_path)
+   {
+      if (_wfullpath(abs_path, rel_path, PATH_MAX_LENGTH))
+      {
+         char *tmp = utf16_to_utf8_string_alloc(abs_path);
+
+         if (tmp)
+         {
+            strlcpy(buf, tmp, size);
+            free(tmp);
+            ret = buf;
+         }
+      }
+
+      free(rel_path);
+   }
+
+   return ret;
+#else
+   char tmp[PATH_MAX_LENGTH];
+   size_t t;
+   char *p;
+   const char *next;
+   const char *buf_end;
+
+   if (resolve_symlinks)
+   {
+      strlcpy(tmp, buf, sizeof(tmp));
+
+      /* NOTE: realpath() expects at least PATH_MAX_LENGTH bytes in buf.
+       * Technically, PATH_MAX_LENGTH needn't be defined, but we rely on it anyways.
+       * POSIX 2008 can automatically allocate for you,
+       * but don't rely on that. */
+      if (!realpath(tmp, buf))
+      {
+         strlcpy(buf, tmp, size);
+         return NULL;
+      }
+
+      return buf;
+   }
+
+   t = 0; /* length of output */
+   buf_end = buf + strlen(buf);
+
+   if (!path_is_absolute(buf))
+   {
+      size_t len;
+      /* rebase on working directory */
+      if (!getcwd(tmp, PATH_MAX_LENGTH-1))
+         return NULL;
+
+      len = strlen(tmp);
+      t += len;
+
+      if (tmp[len-1] != '/')
+         tmp[t++] = '/';
+
+      if (string_is_empty(buf))
+         goto end;
+
+      p = buf;
+   }
+   else
+   {
+      /* UNIX paths can start with multiple '/', copy those */
+      for (p = buf; *p == '/'; p++)
+         tmp[t++] = '/';
+   }
+
+   /* p points to just after a slash while 'next' points to the next slash
+    * if there are no slashes, they point relative to where one would be */
+   do
+   {
+      next = strchr(p, '/');
+      if (!next)
+         next = buf_end;
+
+      if ((next - p == 2 && p[0] == '.' && p[1] == '.'))
+      {
+         p += 3;
+
+         /* fail for illegal /.., //.. etc */
+         if (t == 1 || tmp[t-2] == '/')
+            return NULL;
+
+         /* delete previous segment in tmp by adjusting size t
+          * tmp[t-1] == '/', find '/' before that */
+         t = t-2;
+         while (tmp[t] != '/')
+            t--;
+         t++;
+      }
+      else if (next - p == 1 && p[0] == '.')
+         p += 2;
+      else if (next - p == 0)
+         p += 1;
+      else
+      {
+         /* fail when truncating */
+         if (t + next-p+1 > PATH_MAX_LENGTH-1)
+            return NULL;
+
+         while (p <= next)
+            tmp[t++] = *p++;
+      }
+
+   }
+   while (next < buf_end);
+
+end:
+   tmp[t] = '\0';
+   strlcpy(buf, tmp, size);
+   return buf;
+#endif
+#endif
+   return NULL;
+}
+
+/**
+ * path_relative_to:
+ * @out                : buffer to write the relative path to
+ * @path               : path to be expressed relatively
+ * @base               : base directory to start out on
+ * @size               : size of output buffer
+ *
+ * Turns @path into a path relative to @base and writes it to @out.
+ *
+ * @base is assumed to be a base directory, i.e. a path ending with '/' or '\'.
+ * Both @path and @base are assumed to be absolute paths without "." or "..".
+ *
+ * E.g. path /a/b/e/f.cg with base /a/b/c/d/ turns into ../../e/f.cg
+ **/
+size_t path_relative_to(char *out,
+      const char *path, const char *base, size_t size)
+{
+   size_t i, j;
+   const char *trimmed_path, *trimmed_base;
+
+#ifdef _WIN32
+   /* For different drives, return absolute path */
+   if (strlen(path) >= 2 && strlen(base) >= 2
+         && path[1] == ':' && base[1] == ':'
+         && path[0] != base[0])
+      return strlcpy(out, path, size);
+#endif
+
+   /* Trim common beginning */
+   for (i = 0, j = 0; path[i] && base[i] && path[i] == base[i]; i++)
+      if (path[i] == PATH_DEFAULT_SLASH_C())
+         j = i + 1;
+
+   trimmed_path = path+j;
+   trimmed_base = base+i;
+
+   /* Each segment of base turns into ".." */
+   out[0] = '\0';
+   for (i = 0; trimmed_base[i]; i++)
+      if (trimmed_base[i] == PATH_DEFAULT_SLASH_C())
+         strlcat(out, ".." PATH_DEFAULT_SLASH(), size);
+
+   return strlcat(out, trimmed_path, size);
+}
+
+/**
+ * fill_pathname_resolve_relative:
+ * @out_path           : output path
+ * @in_refpath         : input reference path
+ * @in_path            : input path
+ * @size               : size of @out_path
+ *
+ * Joins basedir of @in_refpath together with @in_path.
+ * If @in_path is an absolute path, out_path = in_path.
+ * E.g.: in_refpath = "/foo/bar/baz.a", in_path = "foobar.cg",
+ * out_path = "/foo/bar/foobar.cg".
+ **/
+void fill_pathname_resolve_relative(char *out_path,
+      const char *in_refpath, const char *in_path, size_t size)
+{
+   if (path_is_absolute(in_path))
+   {
+      strlcpy(out_path, in_path, size);
+      return;
+   }
+
+   fill_pathname_basedir(out_path, in_refpath, size);
+   strlcat(out_path, in_path, size);
+   path_resolve_realpath(out_path, size, false);
+}
+
+/**
+ * fill_pathname_join:
+ * @out_path           : output path
+ * @dir                : directory
+ * @path               : path
+ * @size               : size of output path
+ *
+ * Joins a directory (@dir) and path (@path) together.
+ * Makes sure not to get  two consecutive slashes
+ * between directory and path.
+ **/
+size_t fill_pathname_join(char *out_path,
+      const char *dir, const char *path, size_t size)
+{
+   if (out_path != dir)
+      strlcpy(out_path, dir, size);
+
+   if (*out_path)
+      fill_pathname_slash(out_path, size);
+
+   return strlcat(out_path, path, size);
+}
+
+size_t fill_pathname_join_special_ext(char *out_path,
+      const char *dir,  const char *path,
+      const char *last, const char *ext,
+      size_t size)
+{
+   fill_pathname_join(out_path, dir, path, size);
+   if (*out_path)
+      fill_pathname_slash(out_path, size);
+
+   strlcat(out_path, last, size);
+   return strlcat(out_path, ext, size);
+}
+
+size_t fill_pathname_join_concat_noext(char *out_path,
+      const char *dir, const char *path,
+      const char *concat,
+      size_t size)
+{
+   fill_pathname_noext(out_path, dir, path, size);
+   return strlcat(out_path, concat, size);
+}
+
+size_t fill_pathname_join_concat(char *out_path,
+      const char *dir, const char *path,
+      const char *concat,
+      size_t size)
+{
+   fill_pathname_join(out_path, dir, path, size);
+   return strlcat(out_path, concat, size);
+}
+
+void fill_pathname_join_noext(char *out_path,
+      const char *dir, const char *path, size_t size)
+{
+   fill_pathname_join(out_path, dir, path, size);
+   path_remove_extension(out_path);
+}
+
+/**
+ * fill_pathname_join_delim:
+ * @out_path           : output path
+ * @dir                : directory
+ * @path               : path
+ * @delim              : delimiter
+ * @size               : size of output path
+ *
+ * Joins a directory (@dir) and path (@path) together
+ * using the given delimiter (@delim).
+ **/
+size_t fill_pathname_join_delim(char *out_path, const char *dir,
+      const char *path, const char delim, size_t size)
+{
+   size_t copied;
+   /* behavior of strlcpy is undefined if dst and src overlap */
+   if (out_path == dir)
+      copied = strlen(dir);
+   else
+      copied = strlcpy(out_path, dir, size);
+
+   out_path[copied]   = delim;
+   out_path[copied+1] = '\0';
+
+   if (path)
+      copied = strlcat(out_path, path, size);
+   return copied;
+}
+
+size_t fill_pathname_join_delim_concat(char *out_path, const char *dir,
+      const char *path, const char delim, const char *concat,
+      size_t size)
+{
+   fill_pathname_join_delim(out_path, dir, path, delim, size);
+   return strlcat(out_path, concat, size);
+}
+
+/**
+ * fill_short_pathname_representation:
+ * @out_rep            : output representation
+ * @in_path            : input path
+ * @size               : size of output representation
+ *
+ * Generates a short representation of path. It should only
+ * be used for displaying the result; the output representation is not
+ * binding in any meaningful way (for a normal path, this is the same as basename)
+ * In case of more complex URLs, this should cut everything except for
+ * the main image file.
+ *
+ * E.g.: "/path/to/game.img" -> game.img
+ *       "/path/to/myarchive.7z#folder/to/game.img" -> game.img
+ */
+size_t fill_short_pathname_representation(char* out_rep,
+      const char *in_path, size_t size)
+{
+   char path_short[PATH_MAX_LENGTH];
+
+   path_short[0] = '\0';
+
+   fill_pathname(path_short, path_basename(in_path), "",
+            sizeof(path_short));
+
+   return strlcpy(out_rep, path_short, size);
+}
+
+void fill_short_pathname_representation_noext(char* out_rep,
+      const char *in_path, size_t size)
+{
+   fill_short_pathname_representation(out_rep, in_path, size);
+   path_remove_extension(out_rep);
+}
+
+void fill_pathname_expand_special(char *out_path,
+      const char *in_path, size_t size)
+{
+#if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
+   if (in_path[0] == '~')
+   {
+      char *home_dir = (char*)malloc(PATH_MAX_LENGTH * sizeof(char));
+
+      home_dir[0] = '\0';
+
+      fill_pathname_home_dir(home_dir,
+         PATH_MAX_LENGTH * sizeof(char));
+
+      if (*home_dir)
+      {
+         size_t src_size = strlcpy(out_path, home_dir, size);
+         retro_assert(src_size < size);
+
+         out_path  += src_size;
+         size      -= src_size;
+
+         if (!PATH_CHAR_IS_SLASH(out_path[-1]))
+         {
+            src_size = strlcpy(out_path, PATH_DEFAULT_SLASH(), size);
+            retro_assert(src_size < size);
+
+            out_path += src_size;
+            size     -= src_size;
+         }
+
+         in_path += 2;
+      }
+
+      free(home_dir);
+   }
+   else if (in_path[0] == ':')
+   {
+      char *application_dir = (char*)malloc(PATH_MAX_LENGTH * sizeof(char));
+
+      application_dir[0]    = '\0';
+
+      fill_pathname_application_dir(application_dir,
+            PATH_MAX_LENGTH * sizeof(char));
+
+      if (*application_dir)
+      {
+         size_t src_size   = strlcpy(out_path, application_dir, size);
+         retro_assert(src_size < size);
+
+         out_path  += src_size;
+         size      -= src_size;
+
+         if (!PATH_CHAR_IS_SLASH(out_path[-1]))
+         {
+            src_size = strlcpy(out_path, PATH_DEFAULT_SLASH(), size);
+            retro_assert(src_size < size);
+
+            out_path += src_size;
+            size     -= src_size;
+         }
+
+         in_path += 2;
+      }
+
+      free(application_dir);
+   }
+#endif
+
+   retro_assert(strlcpy(out_path, in_path, size) < size);
+}
+
+void fill_pathname_abbreviate_special(char *out_path,
+      const char *in_path, size_t size)
+{
+#if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
+   unsigned i;
+   const char *candidates[3];
+   const char *notations[3];
+   char application_dir[PATH_MAX_LENGTH];
+   char home_dir[PATH_MAX_LENGTH];
+
+   application_dir[0] = '\0';
+   home_dir[0]        = '\0';
+
+   /* application_dir could be zero-string. Safeguard against this.
+    *
+    * Keep application dir in front of home, moving app dir to a
+    * new location inside home would break otherwise. */
+
+   /* ugly hack - use application_dir pointer
+    * before filling it in. C89 reasons */
+   candidates[0] = application_dir;
+   candidates[1] = home_dir;
+   candidates[2] = NULL;
+
+   notations [0] = ":";
+   notations [1] = "~";
+   notations [2] = NULL;
+
+   fill_pathname_application_dir(application_dir, sizeof(application_dir));
+   fill_pathname_home_dir(home_dir, sizeof(home_dir));
+
+   for (i = 0; candidates[i]; i++)
+   {
+      if (!string_is_empty(candidates[i]) &&
+          string_starts_with(in_path, candidates[i]))
+      {
+         size_t src_size  = strlcpy(out_path, notations[i], size);
+
+         retro_assert(src_size < size);
+
+         out_path        += src_size;
+         size            -= src_size;
+         in_path         += strlen(candidates[i]);
+
+         if (!PATH_CHAR_IS_SLASH(*in_path))
+         {
+            strcpy_literal(out_path, PATH_DEFAULT_SLASH());
+            out_path++;
+            size--;
+         }
+
+         break; /* Don't allow more abbrevs to take place. */
+      }
+   }
+
+#endif
+
+   retro_assert(strlcpy(out_path, in_path, size) < size);
+}
+
+/* Changes the slashes to the correct kind for the os 
+ * So forward slash on linux and backslash on Windows */
+void pathname_conform_slashes_to_os(char *path)
+{
+   /* Conform slashes to os standard so we get proper matching */
+   char* p;
+   for (p = path; *p; p++)
+      if (*p == '/' || *p == '\\')
+         *p = PATH_DEFAULT_SLASH_C();
+}
+
+/* Change all shashes to forward so they are more portable between windows and linux */
+void pathname_make_slashes_portable(char *path)
+{
+   /* Conform slashes to os standard so we get proper matching */
+   char* p;
+   for (p = path; *p; p++)
+      if (*p == '/' || *p == '\\')
+         *p = '/';
+}
+
+/* Get the number of slashes in a path, returns an integer */
+int get_pathname_num_slashes(const char *in_path)
+{
+   int num_slashes = 0;
+   int i = 0;
+
+   for (i = 0; i < PATH_MAX_LENGTH; i++)
+   {
+      if (PATH_CHAR_IS_SLASH(in_path[i]))
+         num_slashes++;
+      if (in_path[i] == '\0')
+         break;
+   }
+
+   return num_slashes;
+}
+
+/* Fills the supplied path with either the abbreviated path or the relative path, which ever
+ * one is has less depth / number of slashes
+ * If lengths of abbreviated and relative paths are the same the relative path will be used
+ * in_path can be an absolute, relative or abbreviated path */
+void fill_pathname_abbreviated_or_relative(char *out_path, const char *in_refpath, const char *in_path, size_t size)
+{
+   char in_path_conformed[PATH_MAX_LENGTH];
+   char in_refpath_conformed[PATH_MAX_LENGTH];
+   char expanded_path[PATH_MAX_LENGTH];
+   char absolute_path[PATH_MAX_LENGTH];
+   char relative_path[PATH_MAX_LENGTH];
+   char abbreviated_path[PATH_MAX_LENGTH];
+   
+   in_path_conformed[0]    = '\0';
+   in_refpath_conformed[0] = '\0';
+   expanded_path[0]        = '\0';
+   absolute_path[0]        = '\0';
+   relative_path[0]        = '\0';
+   abbreviated_path[0]     = '\0';
+
+   strcpy_literal(in_path_conformed, in_path);
+   strcpy_literal(in_refpath_conformed, in_refpath);
+
+   pathname_conform_slashes_to_os(in_path_conformed);
+   pathname_conform_slashes_to_os(in_refpath_conformed);
+
+   /* Expand paths which start with :\ to an absolute path */
+   fill_pathname_expand_special(expanded_path,
+         in_path_conformed, sizeof(expanded_path));
+
+   /* Get the absolute path if it is not already */
+   if (path_is_absolute(expanded_path))
+      strlcpy(absolute_path, expanded_path, PATH_MAX_LENGTH);
+   else
+      fill_pathname_resolve_relative(absolute_path,
+            in_refpath_conformed, in_path_conformed, PATH_MAX_LENGTH);
+
+   pathname_conform_slashes_to_os(absolute_path);
+
+   /* Get the relative path and see how many directories long it is */
+   path_relative_to(relative_path, absolute_path,
+         in_refpath_conformed, sizeof(relative_path));
+
+   /* Get the abbreviated path and see how many directories long it is */
+   fill_pathname_abbreviate_special(abbreviated_path,
+         absolute_path, sizeof(abbreviated_path));
+
+   /* Use the shortest path, preferring the relative path*/
+   if (  get_pathname_num_slashes(relative_path) <= 
+         get_pathname_num_slashes(abbreviated_path))
+      retro_assert(strlcpy(out_path, relative_path, size) < size);
+   else
+      retro_assert(strlcpy(out_path, abbreviated_path, size) < size);
+}
+
+/**
+ * path_basedir:
+ * @path               : path
+ *
+ * Extracts base directory by mutating path.
+ * Keeps trailing '/'.
+ **/
+void path_basedir_wrapper(char *path)
+{
+   char *last = NULL;
+   if (strlen(path) < 2)
+      return;
+
+#ifdef HAVE_COMPRESSION
+   /* We want to find the directory with the archive in basedir. */
+   last = (char*)path_get_archive_delim(path);
+   if (last)
+      *last = '\0';
+#endif
+
+   last = find_last_slash(path);
+
+   if (last)
+      last[1] = '\0';
+   else
+      strlcpy(path, "." PATH_DEFAULT_SLASH(), 3);
+}
+
+#if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
+void fill_pathname_application_path(char *s, size_t len)
+{
+   size_t i;
+#ifdef __APPLE__
+  CFBundleRef bundle = CFBundleGetMainBundle();
+#endif
+#ifdef _WIN32
+   DWORD ret = 0;
+   wchar_t wstr[PATH_MAX_LENGTH] = {0};
+#endif
+#ifdef __HAIKU__
+   image_info info;
+   int32_t cookie = 0;
+#endif
+   (void)i;
+
+   if (!len)
+      return;
+
+#if defined(_WIN32)
+#ifdef LEGACY_WIN32
+   ret    = GetModuleFileNameA(NULL, s, len);
+#else
+   ret    = GetModuleFileNameW(NULL, wstr, ARRAY_SIZE(wstr));
+
+   if (*wstr)
+   {
+      char *str = utf16_to_utf8_string_alloc(wstr);
+
+      if (str)
+      {
+         strlcpy(s, str, len);
+         free(str);
+      }
+   }
+#endif
+   s[ret] = '\0';
+#elif defined(__APPLE__)
+   if (bundle)
+   {
+      CFURLRef bundle_url     = CFBundleCopyBundleURL(bundle);
+      CFStringRef bundle_path = CFURLCopyPath(bundle_url);
+      CFStringGetCString(bundle_path, s, len, kCFStringEncodingUTF8);
+#ifdef HAVE_COCOATOUCH
+      {
+         /* This needs to be done so that the path becomes 
+          * /private/var/... and this
+          * is used consistently throughout for the iOS bundle path */
+         char resolved_bundle_dir_buf[PATH_MAX_LENGTH] = {0};
+         if (realpath(s, resolved_bundle_dir_buf))
+         {
+            strlcpy(s, resolved_bundle_dir_buf, len - 1);
+            strlcat(s, "/", len);
+         }
+      }
+#endif
+
+      CFRelease(bundle_path);
+      CFRelease(bundle_url);
+#ifndef HAVE_COCOATOUCH
+      /* Not sure what this does but it breaks 
+       * stuff for iOS, so skipping */
+      retro_assert(strlcat(s, "nobin", len) < len);
+#endif
+      return;
+   }
+#elif defined(__HAIKU__)
+   while (get_next_image_info(0, &cookie, &info) == B_OK)
+   {
+      if (info.type == B_APP_IMAGE)
+      {
+         strlcpy(s, info.name, len);
+         return;
+      }
+   }
+#elif defined(__QNX__)
+   char *buff = malloc(len);
+
+   if (_cmdname(buff))
+      strlcpy(s, buff, len);
+
+   free(buff);
+#else
+   {
+      pid_t pid;
+      static const char *exts[] = { "exe", "file", "path/a.out" };
+      char link_path[255];
+
+      link_path[0] = *s = '\0';
+      pid       = getpid();
+
+      /* Linux, BSD and Solaris paths. Not standardized. */
+      for (i = 0; i < ARRAY_SIZE(exts); i++)
+      {
+         ssize_t ret;
+
+         snprintf(link_path, sizeof(link_path), "/proc/%u/%s",
+               (unsigned)pid, exts[i]);
+         ret = readlink(link_path, s, len - 1);
+
+         if (ret >= 0)
+         {
+            s[ret] = '\0';
+            return;
+         }
+      }
+   }
+#endif
+}
+
+void fill_pathname_application_dir(char *s, size_t len)
+{
+#ifdef __WINRT__
+   strlcpy(s, uwp_dir_install, len);
+#else
+   fill_pathname_application_path(s, len);
+   path_basedir_wrapper(s);
+#endif
+}
+
+void fill_pathname_home_dir(char *s, size_t len)
+{
+#ifdef __WINRT__
+   const char *home = uwp_dir_data;
+#else
+   const char *home = getenv("HOME");
+#endif
+   if (home)
+      strlcpy(s, home, len);
+   else
+      *s = 0;
+}
+#endif
+
+bool is_path_accessible_using_standard_io(const char *path)
+{
+#ifdef __WINRT__
+   char relative_path_abbrev[PATH_MAX_LENGTH];
+   fill_pathname_abbreviate_special(relative_path_abbrev,
+         path, sizeof(relative_path_abbrev));
+   return (strlen(relative_path_abbrev) >= 2 )
+      &&  (    relative_path_abbrev[0] == ':'
+            || relative_path_abbrev[0] == '~')
+      && PATH_CHAR_IS_SLASH(relative_path_abbrev[1]);
+#else
+   return true;
+#endif
+}
diff --git a/libretro-common/file/file_path_io.c b/libretro-common/file/file_path_io.c
new file mode 100644
index 0000000..63587e3
--- /dev/null
+++ b/libretro-common/file/file_path_io.c
@@ -0,0 +1,151 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (file_path_io.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+
+#include <sys/stat.h>
+
+#include <boolean.h>
+#include <file/file_path.h>
+#include <retro_assert.h>
+#include <compat/strl.h>
+#include <compat/posix_string.h>
+#include <retro_miscellaneous.h>
+#include <string/stdstring.h>
+#define VFS_FRONTEND
+#include <vfs/vfs_implementation.h>
+
+#ifdef _WIN32
+#include <direct.h>
+#else
+#include <unistd.h> /* stat() is defined here */
+#endif
+
+/* TODO/FIXME - globals */
+static retro_vfs_stat_t path_stat_cb   = retro_vfs_stat_impl;
+static retro_vfs_mkdir_t path_mkdir_cb = retro_vfs_mkdir_impl;
+
+void path_vfs_init(const struct retro_vfs_interface_info* vfs_info)
+{
+   const struct retro_vfs_interface* 
+      vfs_iface           = vfs_info->iface;
+
+   path_stat_cb           = retro_vfs_stat_impl;
+   path_mkdir_cb          = retro_vfs_mkdir_impl;
+
+   if (vfs_info->required_interface_version < PATH_REQUIRED_VFS_VERSION || !vfs_iface)
+      return;
+
+   path_stat_cb           = vfs_iface->stat;
+   path_mkdir_cb          = vfs_iface->mkdir;
+}
+
+int path_stat(const char *path)
+{
+   return path_stat_cb(path, NULL);
+}
+
+/**
+ * path_is_directory:
+ * @path               : path
+ *
+ * Checks if path is a directory.
+ *
+ * Returns: true (1) if path is a directory, otherwise false (0).
+ */
+bool path_is_directory(const char *path)
+{
+   return (path_stat_cb(path, NULL) & RETRO_VFS_STAT_IS_DIRECTORY) != 0;
+}
+
+bool path_is_character_special(const char *path)
+{
+   return (path_stat_cb(path, NULL) & RETRO_VFS_STAT_IS_CHARACTER_SPECIAL) != 0;
+}
+
+bool path_is_valid(const char *path)
+{
+   return (path_stat_cb(path, NULL) & RETRO_VFS_STAT_IS_VALID) != 0;
+}
+
+int32_t path_get_size(const char *path)
+{
+   int32_t filesize = 0;
+   if (path_stat_cb(path, &filesize) != 0)
+      return filesize;
+
+   return -1;
+}
+
+/**
+ * path_mkdir:
+ * @dir                : directory
+ *
+ * Create directory on filesystem.
+ *
+ * Returns: true (1) if directory could be created, otherwise false (0).
+ **/
+bool path_mkdir(const char *dir)
+{
+   bool norecurse     = false;
+   char     *basedir  = NULL;
+
+   if (!(dir && *dir))
+      return false;
+
+   /* Use heap. Real chance of stack 
+    * overflow if we recurse too hard. */
+   basedir            = strdup(dir);
+
+   if (!basedir)
+	   return false;
+
+   path_parent_dir(basedir);
+
+   if (!*basedir || !strcmp(basedir, dir))
+   {
+      free(basedir);
+      return false;
+   }
+
+   if (     path_is_directory(basedir)
+         || path_mkdir(basedir))
+      norecurse = true;
+
+   free(basedir);
+
+   if (norecurse)
+   {
+      int ret = path_mkdir_cb(dir);
+
+      /* Don't treat this as an error. */
+      if (ret == -2 && path_is_directory(dir))
+         return true;
+      else if (ret == 0)
+         return true;
+   }
+   return false;
+}
diff --git a/libretro-common/include/boolean.h b/libretro-common/include/boolean.h
index 2c18ef7..9d0d7c1 100644
--- a/libretro-common/include/boolean.h
+++ b/libretro-common/include/boolean.h
@@ -1,4 +1,4 @@
-/* Copyright  (C) 2010-2017 The RetroArch team
+/* Copyright  (C) 2010-2020 The RetroArch team
  *
  * ---------------------------------------------------------------------------------------
  * The following license statement only applies to this file (boolean.h).
@@ -25,7 +25,7 @@
 
 #ifndef __cplusplus
 
-#if defined(_MSC_VER) && !defined(SN_TARGET_PS3)
+#if defined(_MSC_VER) && _MSC_VER < 1800 && !defined(SN_TARGET_PS3)
 /* Hack applied for MSVC when compiling in C89 mode as it isn't C99 compliant. */
 #define bool unsigned char
 #define true 1
diff --git a/libretro-common/include/compat/fopen_utf8.h b/libretro-common/include/compat/fopen_utf8.h
new file mode 100644
index 0000000..97d4404
--- /dev/null
+++ b/libretro-common/include/compat/fopen_utf8.h
@@ -0,0 +1,34 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (fopen_utf8.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_COMPAT_FOPEN_UTF8_H
+#define __LIBRETRO_SDK_COMPAT_FOPEN_UTF8_H
+
+#ifdef _WIN32
+/* Defined to error rather than fopen_utf8, to make it clear to everyone reading the code that not worrying about utf16 is fine */
+/* TODO: enable */
+/* #define fopen (use fopen_utf8 instead) */
+void *fopen_utf8(const char * filename, const char * mode);
+#else
+#define fopen_utf8 fopen
+#endif
+#endif
diff --git a/libretro-common/include/compat/msvc.h b/libretro-common/include/compat/msvc.h
index 5175214..a4c93a5 100644
--- a/libretro-common/include/compat/msvc.h
+++ b/libretro-common/include/compat/msvc.h
@@ -1,4 +1,4 @@
-/* Copyright  (C) 2010-2017 The RetroArch team
+/* Copyright  (C) 2010-2020 The RetroArch team
  *
  * ---------------------------------------------------------------------------------------
  * The following license statement only applies to this file (msvc.h).
@@ -29,20 +29,17 @@
 extern "C"  {
 #endif
 
-/* Pre-MSVC 2015 compilers don't implement snprintf in a cross-platform manner. */
+/* Pre-MSVC 2015 compilers don't implement snprintf, vsnprintf in a cross-platform manner. */
 #if _MSC_VER < 1900
+   #include <stdio.h>
+   #include <stdarg.h>
    #include <stdlib.h>
+
    #ifndef snprintf
       #define snprintf c99_snprintf_retro__
    #endif
-
    int c99_snprintf_retro__(char *outBuf, size_t size, const char *format, ...);
-#endif
 
-/* Pre-MSVC 2010 compilers don't implement vsnprintf in a cross-platform manner? Not sure about this one. */
-#if _MSC_VER < 1600
-   #include <stdarg.h>
-   #include <stdlib.h>
    #ifndef vsnprintf
       #define vsnprintf c99_vsnprintf_retro__
    #endif
@@ -56,6 +53,8 @@ extern "C"  {
 #undef UNICODE /* Do not bother with UNICODE at this time. */
 #include <direct.h>
 #include <stddef.h>
+
+#define _USE_MATH_DEFINES
 #include <math.h>
 
 /* Python headers defines ssize_t and sets HAVE_SSIZE_T.
@@ -92,7 +91,7 @@ typedef int ssize_t;
 #define va_copy(x, y) ((x) = (y))
 #endif
 
-#if _MSC_VER <= 1200
+#if _MSC_VER <= 1310
    #ifndef __cplusplus
       /* VC6 math.h doesn't define some functions when in C mode.
        * Trying to define a prototype gives "undefined reference".
@@ -106,11 +105,7 @@ typedef int ssize_t;
       #define ceilf(x) ((float)ceil((double)x))
       #define floorf(x) ((float)floor((double)x))
       #define sqrtf(x) ((float)sqrt((double)x))
-   #endif
-
-   #ifndef _vscprintf
-      #define _vscprintf c89_vscprintf_retro__
-      int c89_vscprintf_retro__(const char *format, va_list pargs);
+      #define fabsf(x)    ((float)fabs((double)(x)))
    #endif
 
    #ifndef _strtoui64
@@ -129,4 +124,3 @@ typedef int ssize_t;
 
 #endif
 #endif
-
diff --git a/libretro-common/include/compat/msvc/stdint.h b/libretro-common/include/compat/msvc/stdint.h
index c791176..7c91a68 100644
--- a/libretro-common/include/compat/msvc/stdint.h
+++ b/libretro-common/include/compat/msvc/stdint.h
@@ -67,7 +67,6 @@ extern "C" {
 #  endif
 #endif
 
-
 /* 7.18.1 Integer types. */
 
 /* 7.18.1.1 Exact-width integer types. */
@@ -94,7 +93,6 @@ extern "C" {
 typedef signed __int64       int64_t;
 typedef unsigned __int64     uint64_t;
 
-
 /* 7.18.1.2 Minimum-width integer types. */
 typedef int8_t    int_least8_t;
 typedef int16_t   int_least16_t;
@@ -255,4 +253,3 @@ typedef uint64_t  uintmax_t;
 #endif
 
 #endif
-
diff --git a/libretro-common/include/compat/posix_string.h b/libretro-common/include/compat/posix_string.h
new file mode 100644
index 0000000..47964b2
--- /dev/null
+++ b/libretro-common/include/compat/posix_string.h
@@ -0,0 +1,60 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (posix_string.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_COMPAT_POSIX_STRING_H
+#define __LIBRETRO_SDK_COMPAT_POSIX_STRING_H
+
+#include <retro_common_api.h>
+
+#ifdef _MSC_VER
+#include <compat/msvc.h>
+#endif
+
+RETRO_BEGIN_DECLS
+
+#ifdef _WIN32
+#undef strtok_r
+#define strtok_r(str, delim, saveptr) retro_strtok_r__(str, delim, saveptr)
+
+char *strtok_r(char *str, const char *delim, char **saveptr);
+#endif
+
+#ifdef _MSC_VER
+#undef strcasecmp
+#undef strdup
+#define strcasecmp(a, b) retro_strcasecmp__(a, b)
+#define strdup(orig)     retro_strdup__(orig)
+int strcasecmp(const char *a, const char *b);
+char *strdup(const char *orig);
+
+/* isblank is available since MSVC 2013 */
+#if _MSC_VER < 1800
+#undef isblank
+#define isblank(c)       retro_isblank__(c)
+int isblank(int c);
+#endif
+
+#endif
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/include/compat/strcasestr.h b/libretro-common/include/compat/strcasestr.h
new file mode 100644
index 0000000..227e253
--- /dev/null
+++ b/libretro-common/include/compat/strcasestr.h
@@ -0,0 +1,48 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (strcasestr.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_COMPAT_STRCASESTR_H
+#define __LIBRETRO_SDK_COMPAT_STRCASESTR_H
+
+#include <string.h>
+
+#if defined(RARCH_INTERNAL) && defined(HAVE_CONFIG_H)
+#include "../../../config.h"
+#endif
+
+#ifndef HAVE_STRCASESTR
+
+#include <retro_common_api.h>
+
+RETRO_BEGIN_DECLS
+
+/* Avoid possible naming collisions during link
+ * since we prefer to use the actual name. */
+#define strcasestr(haystack, needle) strcasestr_retro__(haystack, needle)
+
+char *strcasestr(const char *haystack, const char *needle);
+
+RETRO_END_DECLS
+
+#endif
+
+#endif
diff --git a/libretro-common/include/compat/strl.h b/libretro-common/include/compat/strl.h
new file mode 100644
index 0000000..5e7a892
--- /dev/null
+++ b/libretro-common/include/compat/strl.h
@@ -0,0 +1,59 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (strl.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_COMPAT_STRL_H
+#define __LIBRETRO_SDK_COMPAT_STRL_H
+
+#include <string.h>
+#include <stddef.h>
+
+#if defined(RARCH_INTERNAL) && defined(HAVE_CONFIG_H)
+#include "../../../config.h"
+#endif
+
+#include <retro_common_api.h>
+
+RETRO_BEGIN_DECLS
+
+#ifdef __MACH__
+#ifndef HAVE_STRL
+#define HAVE_STRL
+#endif
+#endif
+
+#ifndef HAVE_STRL
+/* Avoid possible naming collisions during link since
+ * we prefer to use the actual name. */
+#define strlcpy(dst, src, size) strlcpy_retro__(dst, src, size)
+
+#define strlcat(dst, src, size) strlcat_retro__(dst, src, size)
+
+size_t strlcpy(char *dest, const char *source, size_t size);
+size_t strlcat(char *dest, const char *source, size_t size);
+
+#endif
+
+char *strldup(const char *s, size_t n);
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/include/encodings/utf.h b/libretro-common/include/encodings/utf.h
new file mode 100644
index 0000000..bea4e14
--- /dev/null
+++ b/libretro-common/include/encodings/utf.h
@@ -0,0 +1,67 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (utf.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _LIBRETRO_ENCODINGS_UTF_H
+#define _LIBRETRO_ENCODINGS_UTF_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include <boolean.h>
+
+#include <retro_common_api.h>
+
+RETRO_BEGIN_DECLS
+
+enum CodePage
+{
+   CODEPAGE_LOCAL = 0, /* CP_ACP */
+   CODEPAGE_UTF8  = 65001 /* CP_UTF8 */
+};
+
+size_t utf8_conv_utf32(uint32_t *out, size_t out_chars,
+      const char *in, size_t in_size);
+
+bool utf16_conv_utf8(uint8_t *out, size_t *out_chars,
+      const uint16_t *in, size_t in_size);
+
+size_t utf8len(const char *string);
+
+size_t utf8cpy(char *d, size_t d_len, const char *s, size_t chars);
+
+const char *utf8skip(const char *str, size_t chars);
+
+uint32_t utf8_walk(const char **string);
+
+bool utf16_to_char_string(const uint16_t *in, char *s, size_t len);
+
+char* utf8_to_local_string_alloc(const char *str);
+
+char* local_to_utf8_string_alloc(const char *str);
+
+wchar_t* utf8_to_utf16_string_alloc(const char *str);
+
+char* utf16_to_utf8_string_alloc(const wchar_t *str);
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/include/file/file_path.h b/libretro-common/include/file/file_path.h
new file mode 100644
index 0000000..452763f
--- /dev/null
+++ b/libretro-common/include/file/file_path.h
@@ -0,0 +1,538 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (file_path.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_FILE_PATH_H
+#define __LIBRETRO_SDK_FILE_PATH_H
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <sys/types.h>
+
+#include <libretro.h>
+#include <retro_common_api.h>
+
+#include <boolean.h>
+
+RETRO_BEGIN_DECLS
+
+#define PATH_REQUIRED_VFS_VERSION 3
+
+void path_vfs_init(const struct retro_vfs_interface_info* vfs_info);
+
+/* Order in this enum is equivalent to negative sort order in filelist
+ *  (i.e. DIRECTORY is on top of PLAIN_FILE) */
+enum
+{
+   RARCH_FILETYPE_UNSET,
+   RARCH_PLAIN_FILE,
+   RARCH_COMPRESSED_FILE_IN_ARCHIVE,
+   RARCH_COMPRESSED_ARCHIVE,
+   RARCH_DIRECTORY,
+   RARCH_FILE_UNSUPPORTED
+};
+
+/**
+ * path_is_compressed_file:
+ * @path               : path
+ *
+ * Checks if path is a compressed file.
+ *
+ * Returns: true (1) if path is a compressed file, otherwise false (0).
+ **/
+bool path_is_compressed_file(const char *path);
+
+/**
+ * path_contains_compressed_file:
+ * @path               : path
+ *
+ * Checks if path contains a compressed file.
+ *
+ * Currently we only check for hash symbol (#) inside the pathname.
+ * If path is ever expanded to a general URI, we should check for that here.
+ *
+ * Example:  Somewhere in the path there might be a compressed file
+ * E.g.: /path/to/file.7z#mygame.img
+ *
+ * Returns: true (1) if path contains compressed file, otherwise false (0).
+ **/
+#define path_contains_compressed_file(path) (path_get_archive_delim((path)) != NULL)
+
+/**
+ * path_get_archive_delim:
+ * @path               : path
+ *
+ * Gets delimiter of an archive file. Only the first '#'
+ * after a compression extension is considered.
+ *
+ * Returns: pointer to the delimiter in the path if it contains
+ * a compressed file, otherwise NULL.
+ */
+const char *path_get_archive_delim(const char *path);
+
+/**
+ * path_get_extension:
+ * @path               : path
+ *
+ * Gets extension of file. Only '.'s
+ * after the last slash are considered.
+ *
+ * Returns: extension part from the path.
+ */
+const char *path_get_extension(const char *path);
+
+/**
+ * path_remove_extension:
+ * @path               : path
+ *
+ * Mutates path by removing its extension. Removes all
+ * text after and including the last '.'.
+ * Only '.'s after the last slash are considered.
+ *
+ * Returns:
+ * 1) If path has an extension, returns path with the
+ *    extension removed.
+ * 2) If there is no extension, returns NULL.
+ * 3) If path is empty or NULL, returns NULL
+ */
+char *path_remove_extension(char *path);
+
+/**
+ * path_basename:
+ * @path               : path
+ *
+ * Get basename from @path.
+ *
+ * Returns: basename from path.
+ **/
+const char *path_basename(const char *path);
+const char *path_basename_nocompression(const char *path);
+
+/**
+ * path_basedir:
+ * @path               : path
+ *
+ * Extracts base directory by mutating path.
+ * Keeps trailing '/'.
+ **/
+void path_basedir(char *path);
+
+/**
+ * path_parent_dir:
+ * @path               : path
+ *
+ * Extracts parent directory by mutating path.
+ * Assumes that path is a directory. Keeps trailing '/'.
+ * If the path was already at the root directory, returns empty string
+ **/
+void path_parent_dir(char *path);
+
+/**
+ * path_resolve_realpath:
+ * @buf                : input and output buffer for path
+ * @size               : size of buffer
+ * @resolve_symlinks   : whether to resolve symlinks or not
+ *
+ * Resolves use of ".", "..", multiple slashes etc in absolute paths.
+ *
+ * Relative paths are rebased on the current working dir.
+ *
+ * Returns: @buf if successful, NULL otherwise.
+ * Note: Not implemented on consoles
+ * Note: Symlinks are only resolved on Unix-likes
+ * Note: The current working dir might not be what you expect,
+ *       e.g. on Android it is "/"
+ *       Use of fill_pathname_resolve_relative() should be prefered
+ **/
+char *path_resolve_realpath(char *buf, size_t size, bool resolve_symlinks);
+
+/**
+ * path_relative_to:
+ * @out                : buffer to write the relative path to
+ * @path               : path to be expressed relatively
+ * @base               : relative to this
+ * @size               : size of output buffer
+ *
+ * Turns @path into a path relative to @base and writes it to @out.
+ *
+ * @base is assumed to be a base directory, i.e. a path ending with '/' or '\'.
+ * Both @path and @base are assumed to be absolute paths without "." or "..".
+ *
+ * E.g. path /a/b/e/f.cgp with base /a/b/c/d/ turns into ../../e/f.cgp
+ **/
+size_t path_relative_to(char *out, const char *path, const char *base, size_t size);
+
+/**
+ * path_is_absolute:
+ * @path               : path
+ *
+ * Checks if @path is an absolute path or a relative path.
+ *
+ * Returns: true if path is absolute, false if path is relative.
+ **/
+bool path_is_absolute(const char *path);
+
+/**
+ * fill_pathname:
+ * @out_path           : output path
+ * @in_path            : input  path
+ * @replace            : what to replace
+ * @size               : buffer size of output path
+ *
+ * FIXME: Verify
+ *
+ * Replaces filename extension with 'replace' and outputs result to out_path.
+ * The extension here is considered to be the string from the last '.'
+ * to the end.
+ *
+ * Only '.'s after the last slash are considered as extensions.
+ * If no '.' is present, in_path and replace will simply be concatenated.
+ * 'size' is buffer size of 'out_path'.
+ * E.g.: in_path = "/foo/bar/baz/boo.c", replace = ".asm" =>
+ * out_path = "/foo/bar/baz/boo.asm"
+ * E.g.: in_path = "/foo/bar/baz/boo.c", replace = ""     =>
+ * out_path = "/foo/bar/baz/boo"
+ */
+void fill_pathname(char *out_path, const char *in_path,
+      const char *replace, size_t size);
+
+/**
+ * fill_dated_filename:
+ * @out_filename       : output filename
+ * @ext                : extension of output filename
+ * @size               : buffer size of output filename
+ *
+ * Creates a 'dated' filename prefixed by 'RetroArch', and
+ * concatenates extension (@ext) to it.
+ *
+ * E.g.:
+ * out_filename = "RetroArch-{month}{day}-{Hours}{Minutes}.{@ext}"
+ **/
+size_t fill_dated_filename(char *out_filename,
+      const char *ext, size_t size);
+
+/**
+ * fill_str_dated_filename:
+ * @out_filename       : output filename
+ * @in_str             : input string
+ * @ext                : extension of output filename
+ * @size               : buffer size of output filename
+ *
+ * Creates a 'dated' filename prefixed by the string @in_str, and
+ * concatenates extension (@ext) to it.
+ *
+ * E.g.:
+ * out_filename = "RetroArch-{year}{month}{day}-{Hour}{Minute}{Second}.{@ext}"
+ **/
+void fill_str_dated_filename(char *out_filename,
+      const char *in_str, const char *ext, size_t size);
+
+/**
+ * fill_pathname_noext:
+ * @out_path           : output path
+ * @in_path            : input  path
+ * @replace            : what to replace
+ * @size               : buffer size of output path
+ *
+ * Appends a filename extension 'replace' to 'in_path', and outputs
+ * result in 'out_path'.
+ *
+ * Assumes in_path has no extension. If an extension is still
+ * present in 'in_path', it will be ignored.
+ *
+ */
+size_t fill_pathname_noext(char *out_path, const char *in_path,
+      const char *replace, size_t size);
+
+/**
+ * find_last_slash:
+ * @str : input path
+ *
+ * Gets a pointer to the last slash in the input path.
+ *
+ * Returns: a pointer to the last slash in the input path.
+ **/
+char *find_last_slash(const char *str);
+
+/**
+ * fill_pathname_dir:
+ * @in_dir             : input directory path
+ * @in_basename        : input basename to be appended to @in_dir
+ * @replace            : replacement to be appended to @in_basename
+ * @size               : size of buffer
+ *
+ * Appends basename of 'in_basename', to 'in_dir', along with 'replace'.
+ * Basename of in_basename is the string after the last '/' or '\\',
+ * i.e the filename without directories.
+ *
+ * If in_basename has no '/' or '\\', the whole 'in_basename' will be used.
+ * 'size' is buffer size of 'in_dir'.
+ *
+ * E.g..: in_dir = "/tmp/some_dir", in_basename = "/some_content/foo.c",
+ * replace = ".asm" => in_dir = "/tmp/some_dir/foo.c.asm"
+ **/
+size_t fill_pathname_dir(char *in_dir, const char *in_basename,
+      const char *replace, size_t size);
+
+/**
+ * fill_pathname_base:
+ * @out                : output path
+ * @in_path            : input path
+ * @size               : size of output path
+ *
+ * Copies basename of @in_path into @out_path.
+ **/
+size_t fill_pathname_base(char *out_path, const char *in_path, size_t size);
+
+void fill_pathname_base_noext(char *out_dir,
+      const char *in_path, size_t size);
+
+size_t fill_pathname_base_ext(char *out,
+      const char *in_path, const char *ext,
+      size_t size);
+
+/**
+ * fill_pathname_basedir:
+ * @out_dir            : output directory
+ * @in_path            : input path
+ * @size               : size of output directory
+ *
+ * Copies base directory of @in_path into @out_path.
+ * If in_path is a path without any slashes (relative current directory),
+ * @out_path will get path "./".
+ **/
+void fill_pathname_basedir(char *out_path, const char *in_path, size_t size);
+
+void fill_pathname_basedir_noext(char *out_dir,
+      const char *in_path, size_t size);
+
+/**
+ * fill_pathname_parent_dir_name:
+ * @out_dir            : output directory
+ * @in_dir             : input directory
+ * @size               : size of output directory
+ *
+ * Copies only the parent directory name of @in_dir into @out_dir.
+ * The two buffers must not overlap. Removes trailing '/'.
+ * Returns true on success, false if a slash was not found in the path.
+ **/
+bool fill_pathname_parent_dir_name(char *out_dir,
+      const char *in_dir, size_t size);
+
+/**
+ * fill_pathname_parent_dir:
+ * @out_dir            : output directory
+ * @in_dir             : input directory
+ * @size               : size of output directory
+ *
+ * Copies parent directory of @in_dir into @out_dir.
+ * Assumes @in_dir is a directory. Keeps trailing '/'.
+ * If the path was already at the root directory, @out_dir will be an empty string.
+ **/
+void fill_pathname_parent_dir(char *out_dir,
+      const char *in_dir, size_t size);
+
+/**
+ * fill_pathname_resolve_relative:
+ * @out_path           : output path
+ * @in_refpath         : input reference path
+ * @in_path            : input path
+ * @size               : size of @out_path
+ *
+ * Joins basedir of @in_refpath together with @in_path.
+ * If @in_path is an absolute path, out_path = in_path.
+ * E.g.: in_refpath = "/foo/bar/baz.a", in_path = "foobar.cg",
+ * out_path = "/foo/bar/foobar.cg".
+ **/
+void fill_pathname_resolve_relative(char *out_path, const char *in_refpath,
+      const char *in_path, size_t size);
+
+/**
+ * fill_pathname_join:
+ * @out_path           : output path
+ * @dir                : directory
+ * @path               : path
+ * @size               : size of output path
+ *
+ * Joins a directory (@dir) and path (@path) together.
+ * Makes sure not to get  two consecutive slashes
+ * between directory and path.
+ **/
+size_t fill_pathname_join(char *out_path, const char *dir,
+      const char *path, size_t size);
+
+size_t fill_pathname_join_special_ext(char *out_path,
+      const char *dir,  const char *path,
+      const char *last, const char *ext,
+      size_t size);
+
+size_t fill_pathname_join_concat_noext(char *out_path,
+      const char *dir, const char *path,
+      const char *concat,
+      size_t size);
+
+size_t fill_pathname_join_concat(char *out_path,
+      const char *dir, const char *path,
+      const char *concat,
+      size_t size);
+
+void fill_pathname_join_noext(char *out_path,
+      const char *dir, const char *path, size_t size);
+
+/**
+ * fill_pathname_join_delim:
+ * @out_path           : output path
+ * @dir                : directory
+ * @path               : path
+ * @delim              : delimiter
+ * @size               : size of output path
+ *
+ * Joins a directory (@dir) and path (@path) together
+ * using the given delimiter (@delim).
+ **/
+size_t fill_pathname_join_delim(char *out_path, const char *dir,
+      const char *path, const char delim, size_t size);
+
+size_t fill_pathname_join_delim_concat(char *out_path, const char *dir,
+      const char *path, const char delim, const char *concat,
+      size_t size);
+
+/**
+ * fill_short_pathname_representation:
+ * @out_rep            : output representation
+ * @in_path            : input path
+ * @size               : size of output representation
+ *
+ * Generates a short representation of path. It should only
+ * be used for displaying the result; the output representation is not
+ * binding in any meaningful way (for a normal path, this is the same as basename)
+ * In case of more complex URLs, this should cut everything except for
+ * the main image file.
+ *
+ * E.g.: "/path/to/game.img" -> game.img
+ *       "/path/to/myarchive.7z#folder/to/game.img" -> game.img
+ */
+size_t fill_short_pathname_representation(char* out_rep,
+      const char *in_path, size_t size);
+
+void fill_short_pathname_representation_noext(char* out_rep,
+      const char *in_path, size_t size);
+
+void fill_pathname_expand_special(char *out_path,
+      const char *in_path, size_t size);
+
+void fill_pathname_abbreviate_special(char *out_path,
+      const char *in_path, size_t size);
+
+void fill_pathname_abbreviated_or_relative(char *out_path, const char *in_refpath, const char *in_path, size_t size);
+
+void pathname_conform_slashes_to_os(char *path);
+
+void pathname_make_slashes_portable(char *path);
+
+/**
+ * path_basedir:
+ * @path               : path
+ *
+ * Extracts base directory by mutating path.
+ * Keeps trailing '/'.
+ **/
+void path_basedir_wrapper(char *path);
+
+/**
+ * path_char_is_slash:
+ * @c                  : character
+ *
+ * Checks if character (@c) is a slash.
+ *
+ * Returns: true (1) if character is a slash, otherwise false (0).
+ */
+#ifdef _WIN32
+#define PATH_CHAR_IS_SLASH(c) (((c) == '/') || ((c) == '\\'))
+#else
+#define PATH_CHAR_IS_SLASH(c) ((c) == '/')
+#endif
+
+/**
+ * path_default_slash and path_default_slash_c:
+ *
+ * Gets the default slash separator.
+ *
+ * Returns: default slash separator.
+ */
+#ifdef _WIN32
+#define PATH_DEFAULT_SLASH() "\\"
+#define PATH_DEFAULT_SLASH_C() '\\'
+#else
+#define PATH_DEFAULT_SLASH() "/"
+#define PATH_DEFAULT_SLASH_C() '/'
+#endif
+
+/**
+ * fill_pathname_slash:
+ * @path               : path
+ * @size               : size of path
+ *
+ * Assumes path is a directory. Appends a slash
+ * if not already there.
+ **/
+void fill_pathname_slash(char *path, size_t size);
+
+#if !defined(RARCH_CONSOLE) && defined(RARCH_INTERNAL)
+void fill_pathname_application_path(char *buf, size_t size);
+void fill_pathname_application_dir(char *buf, size_t size);
+void fill_pathname_home_dir(char *buf, size_t size);
+#endif
+
+/**
+ * path_mkdir:
+ * @dir                : directory
+ *
+ * Create directory on filesystem.
+ *
+ * Returns: true (1) if directory could be created, otherwise false (0).
+ **/
+bool path_mkdir(const char *dir);
+
+/**
+ * path_is_directory:
+ * @path               : path
+ *
+ * Checks if path is a directory.
+ *
+ * Returns: true (1) if path is a directory, otherwise false (0).
+ */
+bool path_is_directory(const char *path);
+
+bool path_is_character_special(const char *path);
+
+int path_stat(const char *path);
+
+bool path_is_valid(const char *path);
+
+int32_t path_get_size(const char *path);
+
+bool is_path_accessible_using_standard_io(const char *path);
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/include/libretro.h b/libretro-common/include/libretro.h
new file mode 100644
index 0000000..d9e28bf
--- /dev/null
+++ b/libretro-common/include/libretro.h
@@ -0,0 +1,3822 @@
+/* Copyright (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this libretro API header (libretro.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef LIBRETRO_H__
+#define LIBRETRO_H__
+
+#include <stdint.h>
+#include <stddef.h>
+#include <limits.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __cplusplus
+#if defined(_MSC_VER) && _MSC_VER < 1800 && !defined(SN_TARGET_PS3)
+/* Hack applied for MSVC when compiling in C89 mode
+ * as it isn't C99-compliant. */
+#define bool unsigned char
+#define true 1
+#define false 0
+#else
+#include <stdbool.h>
+#endif
+#endif
+
+#ifndef RETRO_CALLCONV
+#  if defined(__GNUC__) && defined(__i386__) && !defined(__x86_64__)
+#    define RETRO_CALLCONV __attribute__((cdecl))
+#  elif defined(_MSC_VER) && defined(_M_X86) && !defined(_M_X64)
+#    define RETRO_CALLCONV __cdecl
+#  else
+#    define RETRO_CALLCONV /* all other platforms only have one calling convention each */
+#  endif
+#endif
+
+#ifndef RETRO_API
+#  if defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
+#    ifdef RETRO_IMPORT_SYMBOLS
+#      ifdef __GNUC__
+#        define RETRO_API RETRO_CALLCONV __attribute__((__dllimport__))
+#      else
+#        define RETRO_API RETRO_CALLCONV __declspec(dllimport)
+#      endif
+#    else
+#      ifdef __GNUC__
+#        define RETRO_API RETRO_CALLCONV __attribute__((__dllexport__))
+#      else
+#        define RETRO_API RETRO_CALLCONV __declspec(dllexport)
+#      endif
+#    endif
+#  else
+#      if defined(__GNUC__) && __GNUC__ >= 4
+#        define RETRO_API RETRO_CALLCONV __attribute__((__visibility__("default")))
+#      else
+#        define RETRO_API RETRO_CALLCONV
+#      endif
+#  endif
+#endif
+
+/* Used for checking API/ABI mismatches that can break libretro
+ * implementations.
+ * It is not incremented for compatible changes to the API.
+ */
+#define RETRO_API_VERSION         1
+
+/*
+ * Libretro's fundamental device abstractions.
+ *
+ * Libretro's input system consists of some standardized device types,
+ * such as a joypad (with/without analog), mouse, keyboard, lightgun
+ * and a pointer.
+ *
+ * The functionality of these devices are fixed, and individual cores
+ * map their own concept of a controller to libretro's abstractions.
+ * This makes it possible for frontends to map the abstract types to a
+ * real input device, and not having to worry about binding input
+ * correctly to arbitrary controller layouts.
+ */
+
+#define RETRO_DEVICE_TYPE_SHIFT         8
+#define RETRO_DEVICE_MASK               ((1 << RETRO_DEVICE_TYPE_SHIFT) - 1)
+#define RETRO_DEVICE_SUBCLASS(base, id) (((id + 1) << RETRO_DEVICE_TYPE_SHIFT) | base)
+
+/* Input disabled. */
+#define RETRO_DEVICE_NONE         0
+
+/* The JOYPAD is called RetroPad. It is essentially a Super Nintendo
+ * controller, but with additional L2/R2/L3/R3 buttons, similar to a
+ * PS1 DualShock. */
+#define RETRO_DEVICE_JOYPAD       1
+
+/* The mouse is a simple mouse, similar to Super Nintendo's mouse.
+ * X and Y coordinates are reported relatively to last poll (poll callback).
+ * It is up to the libretro implementation to keep track of where the mouse
+ * pointer is supposed to be on the screen.
+ * The frontend must make sure not to interfere with its own hardware
+ * mouse pointer.
+ */
+#define RETRO_DEVICE_MOUSE        2
+
+/* KEYBOARD device lets one poll for raw key pressed.
+ * It is poll based, so input callback will return with the current
+ * pressed state.
+ * For event/text based keyboard input, see
+ * RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK.
+ */
+#define RETRO_DEVICE_KEYBOARD     3
+
+/* LIGHTGUN device is similar to Guncon-2 for PlayStation 2.
+ * It reports X/Y coordinates in screen space (similar to the pointer)
+ * in the range [-0x8000, 0x7fff] in both axes, with zero being center and
+ * -0x8000 being out of bounds.
+ * As well as reporting on/off screen state. It features a trigger,
+ * start/select buttons, auxiliary action buttons and a
+ * directional pad. A forced off-screen shot can be requested for
+ * auto-reloading function in some games.
+ */
+#define RETRO_DEVICE_LIGHTGUN     4
+
+/* The ANALOG device is an extension to JOYPAD (RetroPad).
+ * Similar to DualShock2 it adds two analog sticks and all buttons can
+ * be analog. This is treated as a separate device type as it returns
+ * axis values in the full analog range of [-0x7fff, 0x7fff],
+ * although some devices may return -0x8000.
+ * Positive X axis is right. Positive Y axis is down.
+ * Buttons are returned in the range [0, 0x7fff].
+ * Only use ANALOG type when polling for analog values.
+ */
+#define RETRO_DEVICE_ANALOG       5
+
+/* Abstracts the concept of a pointing mechanism, e.g. touch.
+ * This allows libretro to query in absolute coordinates where on the
+ * screen a mouse (or something similar) is being placed.
+ * For a touch centric device, coordinates reported are the coordinates
+ * of the press.
+ *
+ * Coordinates in X and Y are reported as:
+ * [-0x7fff, 0x7fff]: -0x7fff corresponds to the far left/top of the screen,
+ * and 0x7fff corresponds to the far right/bottom of the screen.
+ * The "screen" is here defined as area that is passed to the frontend and
+ * later displayed on the monitor.
+ *
+ * The frontend is free to scale/resize this screen as it sees fit, however,
+ * (X, Y) = (-0x7fff, -0x7fff) will correspond to the top-left pixel of the
+ * game image, etc.
+ *
+ * To check if the pointer coordinates are valid (e.g. a touch display
+ * actually being touched), PRESSED returns 1 or 0.
+ *
+ * If using a mouse on a desktop, PRESSED will usually correspond to the
+ * left mouse button, but this is a frontend decision.
+ * PRESSED will only return 1 if the pointer is inside the game screen.
+ *
+ * For multi-touch, the index variable can be used to successively query
+ * more presses.
+ * If index = 0 returns true for _PRESSED, coordinates can be extracted
+ * with _X, _Y for index = 0. One can then query _PRESSED, _X, _Y with
+ * index = 1, and so on.
+ * Eventually _PRESSED will return false for an index. No further presses
+ * are registered at this point. */
+#define RETRO_DEVICE_POINTER      6
+
+/* Buttons for the RetroPad (JOYPAD).
+ * The placement of these is equivalent to placements on the
+ * Super Nintendo controller.
+ * L2/R2/L3/R3 buttons correspond to the PS1 DualShock.
+ * Also used as id values for RETRO_DEVICE_INDEX_ANALOG_BUTTON */
+#define RETRO_DEVICE_ID_JOYPAD_B        0
+#define RETRO_DEVICE_ID_JOYPAD_Y        1
+#define RETRO_DEVICE_ID_JOYPAD_SELECT   2
+#define RETRO_DEVICE_ID_JOYPAD_START    3
+#define RETRO_DEVICE_ID_JOYPAD_UP       4
+#define RETRO_DEVICE_ID_JOYPAD_DOWN     5
+#define RETRO_DEVICE_ID_JOYPAD_LEFT     6
+#define RETRO_DEVICE_ID_JOYPAD_RIGHT    7
+#define RETRO_DEVICE_ID_JOYPAD_A        8
+#define RETRO_DEVICE_ID_JOYPAD_X        9
+#define RETRO_DEVICE_ID_JOYPAD_L       10
+#define RETRO_DEVICE_ID_JOYPAD_R       11
+#define RETRO_DEVICE_ID_JOYPAD_L2      12
+#define RETRO_DEVICE_ID_JOYPAD_R2      13
+#define RETRO_DEVICE_ID_JOYPAD_L3      14
+#define RETRO_DEVICE_ID_JOYPAD_R3      15
+
+#define RETRO_DEVICE_ID_JOYPAD_MASK    256
+
+/* Index / Id values for ANALOG device. */
+#define RETRO_DEVICE_INDEX_ANALOG_LEFT       0
+#define RETRO_DEVICE_INDEX_ANALOG_RIGHT      1
+#define RETRO_DEVICE_INDEX_ANALOG_BUTTON     2
+#define RETRO_DEVICE_ID_ANALOG_X             0
+#define RETRO_DEVICE_ID_ANALOG_Y             1
+
+/* Id values for MOUSE. */
+#define RETRO_DEVICE_ID_MOUSE_X                0
+#define RETRO_DEVICE_ID_MOUSE_Y                1
+#define RETRO_DEVICE_ID_MOUSE_LEFT             2
+#define RETRO_DEVICE_ID_MOUSE_RIGHT            3
+#define RETRO_DEVICE_ID_MOUSE_WHEELUP          4
+#define RETRO_DEVICE_ID_MOUSE_WHEELDOWN        5
+#define RETRO_DEVICE_ID_MOUSE_MIDDLE           6
+#define RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELUP    7
+#define RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELDOWN  8
+#define RETRO_DEVICE_ID_MOUSE_BUTTON_4         9
+#define RETRO_DEVICE_ID_MOUSE_BUTTON_5         10
+
+/* Id values for LIGHTGUN. */
+#define RETRO_DEVICE_ID_LIGHTGUN_SCREEN_X        13 /*Absolute Position*/
+#define RETRO_DEVICE_ID_LIGHTGUN_SCREEN_Y        14 /*Absolute*/
+#define RETRO_DEVICE_ID_LIGHTGUN_IS_OFFSCREEN    15 /*Status Check*/
+#define RETRO_DEVICE_ID_LIGHTGUN_TRIGGER          2
+#define RETRO_DEVICE_ID_LIGHTGUN_RELOAD          16 /*Forced off-screen shot*/
+#define RETRO_DEVICE_ID_LIGHTGUN_AUX_A            3
+#define RETRO_DEVICE_ID_LIGHTGUN_AUX_B            4
+#define RETRO_DEVICE_ID_LIGHTGUN_START            6
+#define RETRO_DEVICE_ID_LIGHTGUN_SELECT           7
+#define RETRO_DEVICE_ID_LIGHTGUN_AUX_C            8
+#define RETRO_DEVICE_ID_LIGHTGUN_DPAD_UP          9
+#define RETRO_DEVICE_ID_LIGHTGUN_DPAD_DOWN       10
+#define RETRO_DEVICE_ID_LIGHTGUN_DPAD_LEFT       11
+#define RETRO_DEVICE_ID_LIGHTGUN_DPAD_RIGHT      12
+/* deprecated */
+#define RETRO_DEVICE_ID_LIGHTGUN_X                0 /*Relative Position*/
+#define RETRO_DEVICE_ID_LIGHTGUN_Y                1 /*Relative*/
+#define RETRO_DEVICE_ID_LIGHTGUN_CURSOR           3 /*Use Aux:A*/
+#define RETRO_DEVICE_ID_LIGHTGUN_TURBO            4 /*Use Aux:B*/
+#define RETRO_DEVICE_ID_LIGHTGUN_PAUSE            5 /*Use Start*/
+
+/* Id values for POINTER. */
+#define RETRO_DEVICE_ID_POINTER_X         0
+#define RETRO_DEVICE_ID_POINTER_Y         1
+#define RETRO_DEVICE_ID_POINTER_PRESSED   2
+#define RETRO_DEVICE_ID_POINTER_COUNT     3
+
+/* Returned from retro_get_region(). */
+#define RETRO_REGION_NTSC  0
+#define RETRO_REGION_PAL   1
+
+/* Id values for LANGUAGE */
+enum retro_language
+{
+   RETRO_LANGUAGE_ENGLISH             = 0,
+   RETRO_LANGUAGE_JAPANESE            = 1,
+   RETRO_LANGUAGE_FRENCH              = 2,
+   RETRO_LANGUAGE_SPANISH             = 3,
+   RETRO_LANGUAGE_GERMAN              = 4,
+   RETRO_LANGUAGE_ITALIAN             = 5,
+   RETRO_LANGUAGE_DUTCH               = 6,
+   RETRO_LANGUAGE_PORTUGUESE_BRAZIL   = 7,
+   RETRO_LANGUAGE_PORTUGUESE_PORTUGAL = 8,
+   RETRO_LANGUAGE_RUSSIAN             = 9,
+   RETRO_LANGUAGE_KOREAN              = 10,
+   RETRO_LANGUAGE_CHINESE_TRADITIONAL = 11,
+   RETRO_LANGUAGE_CHINESE_SIMPLIFIED  = 12,
+   RETRO_LANGUAGE_ESPERANTO           = 13,
+   RETRO_LANGUAGE_POLISH              = 14,
+   RETRO_LANGUAGE_VIETNAMESE          = 15,
+   RETRO_LANGUAGE_ARABIC              = 16,
+   RETRO_LANGUAGE_GREEK               = 17,
+   RETRO_LANGUAGE_TURKISH             = 18,
+   RETRO_LANGUAGE_SLOVAK              = 19,
+   RETRO_LANGUAGE_PERSIAN             = 20,
+   RETRO_LANGUAGE_HEBREW              = 21,
+   RETRO_LANGUAGE_ASTURIAN            = 22,
+   RETRO_LANGUAGE_FINNISH             = 23,
+   RETRO_LANGUAGE_LAST,
+
+   /* Ensure sizeof(enum) == sizeof(int) */
+   RETRO_LANGUAGE_DUMMY          = INT_MAX
+};
+
+/* Passed to retro_get_memory_data/size().
+ * If the memory type doesn't apply to the
+ * implementation NULL/0 can be returned.
+ */
+#define RETRO_MEMORY_MASK        0xff
+
+/* Regular save RAM. This RAM is usually found on a game cartridge,
+ * backed up by a battery.
+ * If save game data is too complex for a single memory buffer,
+ * the SAVE_DIRECTORY (preferably) or SYSTEM_DIRECTORY environment
+ * callback can be used. */
+#define RETRO_MEMORY_SAVE_RAM    0
+
+/* Some games have a built-in clock to keep track of time.
+ * This memory is usually just a couple of bytes to keep track of time.
+ */
+#define RETRO_MEMORY_RTC         1
+
+/* System ram lets a frontend peek into a game systems main RAM. */
+#define RETRO_MEMORY_SYSTEM_RAM  2
+
+/* Video ram lets a frontend peek into a game systems video RAM (VRAM). */
+#define RETRO_MEMORY_VIDEO_RAM   3
+
+/* Keysyms used for ID in input state callback when polling RETRO_KEYBOARD. */
+enum retro_key
+{
+   RETROK_UNKNOWN        = 0,
+   RETROK_FIRST          = 0,
+   RETROK_BACKSPACE      = 8,
+   RETROK_TAB            = 9,
+   RETROK_CLEAR          = 12,
+   RETROK_RETURN         = 13,
+   RETROK_PAUSE          = 19,
+   RETROK_ESCAPE         = 27,
+   RETROK_SPACE          = 32,
+   RETROK_EXCLAIM        = 33,
+   RETROK_QUOTEDBL       = 34,
+   RETROK_HASH           = 35,
+   RETROK_DOLLAR         = 36,
+   RETROK_AMPERSAND      = 38,
+   RETROK_QUOTE          = 39,
+   RETROK_LEFTPAREN      = 40,
+   RETROK_RIGHTPAREN     = 41,
+   RETROK_ASTERISK       = 42,
+   RETROK_PLUS           = 43,
+   RETROK_COMMA          = 44,
+   RETROK_MINUS          = 45,
+   RETROK_PERIOD         = 46,
+   RETROK_SLASH          = 47,
+   RETROK_0              = 48,
+   RETROK_1              = 49,
+   RETROK_2              = 50,
+   RETROK_3              = 51,
+   RETROK_4              = 52,
+   RETROK_5              = 53,
+   RETROK_6              = 54,
+   RETROK_7              = 55,
+   RETROK_8              = 56,
+   RETROK_9              = 57,
+   RETROK_COLON          = 58,
+   RETROK_SEMICOLON      = 59,
+   RETROK_LESS           = 60,
+   RETROK_EQUALS         = 61,
+   RETROK_GREATER        = 62,
+   RETROK_QUESTION       = 63,
+   RETROK_AT             = 64,
+   RETROK_LEFTBRACKET    = 91,
+   RETROK_BACKSLASH      = 92,
+   RETROK_RIGHTBRACKET   = 93,
+   RETROK_CARET          = 94,
+   RETROK_UNDERSCORE     = 95,
+   RETROK_BACKQUOTE      = 96,
+   RETROK_a              = 97,
+   RETROK_b              = 98,
+   RETROK_c              = 99,
+   RETROK_d              = 100,
+   RETROK_e              = 101,
+   RETROK_f              = 102,
+   RETROK_g              = 103,
+   RETROK_h              = 104,
+   RETROK_i              = 105,
+   RETROK_j              = 106,
+   RETROK_k              = 107,
+   RETROK_l              = 108,
+   RETROK_m              = 109,
+   RETROK_n              = 110,
+   RETROK_o              = 111,
+   RETROK_p              = 112,
+   RETROK_q              = 113,
+   RETROK_r              = 114,
+   RETROK_s              = 115,
+   RETROK_t              = 116,
+   RETROK_u              = 117,
+   RETROK_v              = 118,
+   RETROK_w              = 119,
+   RETROK_x              = 120,
+   RETROK_y              = 121,
+   RETROK_z              = 122,
+   RETROK_LEFTBRACE      = 123,
+   RETROK_BAR            = 124,
+   RETROK_RIGHTBRACE     = 125,
+   RETROK_TILDE          = 126,
+   RETROK_DELETE         = 127,
+
+   RETROK_KP0            = 256,
+   RETROK_KP1            = 257,
+   RETROK_KP2            = 258,
+   RETROK_KP3            = 259,
+   RETROK_KP4            = 260,
+   RETROK_KP5            = 261,
+   RETROK_KP6            = 262,
+   RETROK_KP7            = 263,
+   RETROK_KP8            = 264,
+   RETROK_KP9            = 265,
+   RETROK_KP_PERIOD      = 266,
+   RETROK_KP_DIVIDE      = 267,
+   RETROK_KP_MULTIPLY    = 268,
+   RETROK_KP_MINUS       = 269,
+   RETROK_KP_PLUS        = 270,
+   RETROK_KP_ENTER       = 271,
+   RETROK_KP_EQUALS      = 272,
+
+   RETROK_UP             = 273,
+   RETROK_DOWN           = 274,
+   RETROK_RIGHT          = 275,
+   RETROK_LEFT           = 276,
+   RETROK_INSERT         = 277,
+   RETROK_HOME           = 278,
+   RETROK_END            = 279,
+   RETROK_PAGEUP         = 280,
+   RETROK_PAGEDOWN       = 281,
+
+   RETROK_F1             = 282,
+   RETROK_F2             = 283,
+   RETROK_F3             = 284,
+   RETROK_F4             = 285,
+   RETROK_F5             = 286,
+   RETROK_F6             = 287,
+   RETROK_F7             = 288,
+   RETROK_F8             = 289,
+   RETROK_F9             = 290,
+   RETROK_F10            = 291,
+   RETROK_F11            = 292,
+   RETROK_F12            = 293,
+   RETROK_F13            = 294,
+   RETROK_F14            = 295,
+   RETROK_F15            = 296,
+
+   RETROK_NUMLOCK        = 300,
+   RETROK_CAPSLOCK       = 301,
+   RETROK_SCROLLOCK      = 302,
+   RETROK_RSHIFT         = 303,
+   RETROK_LSHIFT         = 304,
+   RETROK_RCTRL          = 305,
+   RETROK_LCTRL          = 306,
+   RETROK_RALT           = 307,
+   RETROK_LALT           = 308,
+   RETROK_RMETA          = 309,
+   RETROK_LMETA          = 310,
+   RETROK_LSUPER         = 311,
+   RETROK_RSUPER         = 312,
+   RETROK_MODE           = 313,
+   RETROK_COMPOSE        = 314,
+
+   RETROK_HELP           = 315,
+   RETROK_PRINT          = 316,
+   RETROK_SYSREQ         = 317,
+   RETROK_BREAK          = 318,
+   RETROK_MENU           = 319,
+   RETROK_POWER          = 320,
+   RETROK_EURO           = 321,
+   RETROK_UNDO           = 322,
+   RETROK_OEM_102        = 323,
+
+   RETROK_LAST,
+
+   RETROK_DUMMY          = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
+};
+
+enum retro_mod
+{
+   RETROKMOD_NONE       = 0x0000,
+
+   RETROKMOD_SHIFT      = 0x01,
+   RETROKMOD_CTRL       = 0x02,
+   RETROKMOD_ALT        = 0x04,
+   RETROKMOD_META       = 0x08,
+
+   RETROKMOD_NUMLOCK    = 0x10,
+   RETROKMOD_CAPSLOCK   = 0x20,
+   RETROKMOD_SCROLLOCK  = 0x40,
+
+   RETROKMOD_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
+};
+
+/* If set, this call is not part of the public libretro API yet. It can
+ * change or be removed at any time. */
+#define RETRO_ENVIRONMENT_EXPERIMENTAL 0x10000
+/* Environment callback to be used internally in frontend. */
+#define RETRO_ENVIRONMENT_PRIVATE 0x20000
+
+/* Environment commands. */
+#define RETRO_ENVIRONMENT_SET_ROTATION  1  /* const unsigned * --
+                                            * Sets screen rotation of graphics.
+                                            * Valid values are 0, 1, 2, 3, which rotates screen by 0, 90, 180,
+                                            * 270 degrees counter-clockwise respectively.
+                                            */
+#define RETRO_ENVIRONMENT_GET_OVERSCAN  2  /* bool * --
+                                            * NOTE: As of 2019 this callback is considered deprecated in favor of
+                                            * using core options to manage overscan in a more nuanced, core-specific way.
+                                            *
+                                            * Boolean value whether or not the implementation should use overscan,
+                                            * or crop away overscan.
+                                            */
+#define RETRO_ENVIRONMENT_GET_CAN_DUPE  3  /* bool * --
+                                            * Boolean value whether or not frontend supports frame duping,
+                                            * passing NULL to video frame callback.
+                                            */
+
+                                           /* Environ 4, 5 are no longer supported (GET_VARIABLE / SET_VARIABLES),
+                                            * and reserved to avoid possible ABI clash.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_MESSAGE   6  /* const struct retro_message * --
+                                            * Sets a message to be displayed in implementation-specific manner
+                                            * for a certain amount of 'frames'.
+                                            * Should not be used for trivial messages, which should simply be
+                                            * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a
+                                            * fallback, stderr).
+                                            */
+#define RETRO_ENVIRONMENT_SHUTDOWN      7  /* N/A (NULL) --
+                                            * Requests the frontend to shutdown.
+                                            * Should only be used if game has a specific
+                                            * way to shutdown the game from a menu item or similar.
+                                            */
+#define RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL 8
+                                           /* const unsigned * --
+                                            * Gives a hint to the frontend how demanding this implementation
+                                            * is on a system. E.g. reporting a level of 2 means
+                                            * this implementation should run decently on all frontends
+                                            * of level 2 and up.
+                                            *
+                                            * It can be used by the frontend to potentially warn
+                                            * about too demanding implementations.
+                                            *
+                                            * The levels are "floating".
+                                            *
+                                            * This function can be called on a per-game basis,
+                                            * as certain games an implementation can play might be
+                                            * particularly demanding.
+                                            * If called, it should be called in retro_load_game().
+                                            */
+#define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9
+                                           /* const char ** --
+                                            * Returns the "system" directory of the frontend.
+                                            * This directory can be used to store system specific
+                                            * content such as BIOSes, configuration data, etc.
+                                            * The returned value can be NULL.
+                                            * If so, no such directory is defined,
+                                            * and it's up to the implementation to find a suitable directory.
+                                            *
+                                            * NOTE: Some cores used this folder also for "save" data such as
+                                            * memory cards, etc, for lack of a better place to put it.
+                                            * This is now discouraged, and if possible, cores should try to
+                                            * use the new GET_SAVE_DIRECTORY.
+                                            */
+#define RETRO_ENVIRONMENT_SET_PIXEL_FORMAT 10
+                                           /* const enum retro_pixel_format * --
+                                            * Sets the internal pixel format used by the implementation.
+                                            * The default pixel format is RETRO_PIXEL_FORMAT_0RGB1555.
+                                            * This pixel format however, is deprecated (see enum retro_pixel_format).
+                                            * If the call returns false, the frontend does not support this pixel
+                                            * format.
+                                            *
+                                            * This function should be called inside retro_load_game() or
+                                            * retro_get_system_av_info().
+                                            */
+#define RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS 11
+                                           /* const struct retro_input_descriptor * --
+                                            * Sets an array of retro_input_descriptors.
+                                            * It is up to the frontend to present this in a usable way.
+                                            * The array is terminated by retro_input_descriptor::description
+                                            * being set to NULL.
+                                            * This function can be called at any time, but it is recommended
+                                            * to call it as early as possible.
+                                            */
+#define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12
+                                           /* const struct retro_keyboard_callback * --
+                                            * Sets a callback function used to notify core about keyboard events.
+                                            */
+#define RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE 13
+                                           /* const struct retro_disk_control_callback * --
+                                            * Sets an interface which frontend can use to eject and insert
+                                            * disk images.
+                                            * This is used for games which consist of multiple images and
+                                            * must be manually swapped out by the user (e.g. PSX).
+                                            */
+#define RETRO_ENVIRONMENT_SET_HW_RENDER 14
+                                           /* struct retro_hw_render_callback * --
+                                            * Sets an interface to let a libretro core render with
+                                            * hardware acceleration.
+                                            * Should be called in retro_load_game().
+                                            * If successful, libretro cores will be able to render to a
+                                            * frontend-provided framebuffer.
+                                            * The size of this framebuffer will be at least as large as
+                                            * max_width/max_height provided in get_av_info().
+                                            * If HW rendering is used, pass only RETRO_HW_FRAME_BUFFER_VALID or
+                                            * NULL to retro_video_refresh_t.
+                                            */
+#define RETRO_ENVIRONMENT_GET_VARIABLE 15
+                                           /* struct retro_variable * --
+                                            * Interface to acquire user-defined information from environment
+                                            * that cannot feasibly be supported in a multi-system way.
+                                            * 'key' should be set to a key which has already been set by
+                                            * SET_VARIABLES.
+                                            * 'data' will be set to a value or NULL.
+                                            */
+#define RETRO_ENVIRONMENT_SET_VARIABLES 16
+                                           /* const struct retro_variable * --
+                                            * Allows an implementation to signal the environment
+                                            * which variables it might want to check for later using
+                                            * GET_VARIABLE.
+                                            * This allows the frontend to present these variables to
+                                            * a user dynamically.
+                                            * This should be called the first time as early as
+                                            * possible (ideally in retro_set_environment).
+                                            * Afterward it may be called again for the core to communicate
+                                            * updated options to the frontend, but the number of core
+                                            * options must not change from the number in the initial call.
+                                            *
+                                            * 'data' points to an array of retro_variable structs
+                                            * terminated by a { NULL, NULL } element.
+                                            * retro_variable::key should be namespaced to not collide
+                                            * with other implementations' keys. E.g. A core called
+                                            * 'foo' should use keys named as 'foo_option'.
+                                            * retro_variable::value should contain a human readable
+                                            * description of the key as well as a '|' delimited list
+                                            * of expected values.
+                                            *
+                                            * The number of possible options should be very limited,
+                                            * i.e. it should be feasible to cycle through options
+                                            * without a keyboard.
+                                            *
+                                            * First entry should be treated as a default.
+                                            *
+                                            * Example entry:
+                                            * { "foo_option", "Speed hack coprocessor X; false|true" }
+                                            *
+                                            * Text before first ';' is description. This ';' must be
+                                            * followed by a space, and followed by a list of possible
+                                            * values split up with '|'.
+                                            *
+                                            * Only strings are operated on. The possible values will
+                                            * generally be displayed and stored as-is by the frontend.
+                                            */
+#define RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE 17
+                                           /* bool * --
+                                            * Result is set to true if some variables are updated by
+                                            * frontend since last call to RETRO_ENVIRONMENT_GET_VARIABLE.
+                                            * Variables should be queried with GET_VARIABLE.
+                                            */
+#define RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME 18
+                                           /* const bool * --
+                                            * If true, the libretro implementation supports calls to
+                                            * retro_load_game() with NULL as argument.
+                                            * Used by cores which can run without particular game data.
+                                            * This should be called within retro_set_environment() only.
+                                            */
+#define RETRO_ENVIRONMENT_GET_LIBRETRO_PATH 19
+                                           /* const char ** --
+                                            * Retrieves the absolute path from where this libretro
+                                            * implementation was loaded.
+                                            * NULL is returned if the libretro was loaded statically
+                                            * (i.e. linked statically to frontend), or if the path cannot be
+                                            * determined.
+                                            * Mostly useful in cooperation with SET_SUPPORT_NO_GAME as assets can
+                                            * be loaded without ugly hacks.
+                                            */
+
+                                           /* Environment 20 was an obsolete version of SET_AUDIO_CALLBACK.
+                                            * It was not used by any known core at the time,
+                                            * and was removed from the API. */
+#define RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK 21
+                                           /* const struct retro_frame_time_callback * --
+                                            * Lets the core know how much time has passed since last
+                                            * invocation of retro_run().
+                                            * The frontend can tamper with the timing to fake fast-forward,
+                                            * slow-motion, frame stepping, etc.
+                                            * In this case the delta time will use the reference value
+                                            * in frame_time_callback..
+                                            */
+#define RETRO_ENVIRONMENT_SET_AUDIO_CALLBACK 22
+                                           /* const struct retro_audio_callback * --
+                                            * Sets an interface which is used to notify a libretro core about audio
+                                            * being available for writing.
+                                            * The callback can be called from any thread, so a core using this must
+                                            * have a thread safe audio implementation.
+                                            * It is intended for games where audio and video are completely
+                                            * asynchronous and audio can be generated on the fly.
+                                            * This interface is not recommended for use with emulators which have
+                                            * highly synchronous audio.
+                                            *
+                                            * The callback only notifies about writability; the libretro core still
+                                            * has to call the normal audio callbacks
+                                            * to write audio. The audio callbacks must be called from within the
+                                            * notification callback.
+                                            * The amount of audio data to write is up to the implementation.
+                                            * Generally, the audio callback will be called continously in a loop.
+                                            *
+                                            * Due to thread safety guarantees and lack of sync between audio and
+                                            * video, a frontend  can selectively disallow this interface based on
+                                            * internal configuration. A core using this interface must also
+                                            * implement the "normal" audio interface.
+                                            *
+                                            * A libretro core using SET_AUDIO_CALLBACK should also make use of
+                                            * SET_FRAME_TIME_CALLBACK.
+                                            */
+#define RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE 23
+                                           /* struct retro_rumble_interface * --
+                                            * Gets an interface which is used by a libretro core to set
+                                            * state of rumble motors in controllers.
+                                            * A strong and weak motor is supported, and they can be
+                                            * controlled indepedently.
+                                            * Should be called from either retro_init() or retro_load_game().
+                                            * Should not be called from retro_set_environment().
+                                            * Returns false if rumble functionality is unavailable.
+                                            */
+#define RETRO_ENVIRONMENT_GET_INPUT_DEVICE_CAPABILITIES 24
+                                           /* uint64_t * --
+                                            * Gets a bitmask telling which device type are expected to be
+                                            * handled properly in a call to retro_input_state_t.
+                                            * Devices which are not handled or recognized always return
+                                            * 0 in retro_input_state_t.
+                                            * Example bitmask: caps = (1 << RETRO_DEVICE_JOYPAD) | (1 << RETRO_DEVICE_ANALOG).
+                                            * Should only be called in retro_run().
+                                            */
+#define RETRO_ENVIRONMENT_GET_SENSOR_INTERFACE (25 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* struct retro_sensor_interface * --
+                                            * Gets access to the sensor interface.
+                                            * The purpose of this interface is to allow
+                                            * setting state related to sensors such as polling rate,
+                                            * enabling/disable it entirely, etc.
+                                            * Reading sensor state is done via the normal
+                                            * input_state_callback API.
+                                            */
+#define RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE (26 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* struct retro_camera_callback * --
+                                            * Gets an interface to a video camera driver.
+                                            * A libretro core can use this interface to get access to a
+                                            * video camera.
+                                            * New video frames are delivered in a callback in same
+                                            * thread as retro_run().
+                                            *
+                                            * GET_CAMERA_INTERFACE should be called in retro_load_game().
+                                            *
+                                            * Depending on the camera implementation used, camera frames
+                                            * will be delivered as a raw framebuffer,
+                                            * or as an OpenGL texture directly.
+                                            *
+                                            * The core has to tell the frontend here which types of
+                                            * buffers can be handled properly.
+                                            * An OpenGL texture can only be handled when using a
+                                            * libretro GL core (SET_HW_RENDER).
+                                            * It is recommended to use a libretro GL core when
+                                            * using camera interface.
+                                            *
+                                            * The camera is not started automatically. The retrieved start/stop
+                                            * functions must be used to explicitly
+                                            * start and stop the camera driver.
+                                            */
+#define RETRO_ENVIRONMENT_GET_LOG_INTERFACE 27
+                                           /* struct retro_log_callback * --
+                                            * Gets an interface for logging. This is useful for
+                                            * logging in a cross-platform way
+                                            * as certain platforms cannot use stderr for logging.
+                                            * It also allows the frontend to
+                                            * show logging information in a more suitable way.
+                                            * If this interface is not used, libretro cores should
+                                            * log to stderr as desired.
+                                            */
+#define RETRO_ENVIRONMENT_GET_PERF_INTERFACE 28
+                                           /* struct retro_perf_callback * --
+                                            * Gets an interface for performance counters. This is useful
+                                            * for performance logging in a cross-platform way and for detecting
+                                            * architecture-specific features, such as SIMD support.
+                                            */
+#define RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE 29
+                                           /* struct retro_location_callback * --
+                                            * Gets access to the location interface.
+                                            * The purpose of this interface is to be able to retrieve
+                                            * location-based information from the host device,
+                                            * such as current latitude / longitude.
+                                            */
+#define RETRO_ENVIRONMENT_GET_CONTENT_DIRECTORY 30 /* Old name, kept for compatibility. */
+#define RETRO_ENVIRONMENT_GET_CORE_ASSETS_DIRECTORY 30
+                                           /* const char ** --
+                                            * Returns the "core assets" directory of the frontend.
+                                            * This directory can be used to store specific assets that the
+                                            * core relies upon, such as art assets,
+                                            * input data, etc etc.
+                                            * The returned value can be NULL.
+                                            * If so, no such directory is defined,
+                                            * and it's up to the implementation to find a suitable directory.
+                                            */
+#define RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY 31
+                                           /* const char ** --
+                                            * Returns the "save" directory of the frontend, unless there is no
+                                            * save directory available. The save directory should be used to
+                                            * store SRAM, memory cards, high scores, etc, if the libretro core
+                                            * cannot use the regular memory interface (retro_get_memory_data()).
+                                            *
+                                            * If the frontend cannot designate a save directory, it will return
+                                            * NULL to indicate that the core should attempt to operate without a
+                                            * save directory set.
+                                            *
+                                            * NOTE: early libretro cores used the system directory for save
+                                            * files. Cores that need to be backwards-compatible can still check
+                                            * GET_SYSTEM_DIRECTORY.
+                                            */
+#define RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO 32
+                                           /* const struct retro_system_av_info * --
+                                            * Sets a new av_info structure. This can only be called from
+                                            * within retro_run().
+                                            * This should *only* be used if the core is completely altering the
+                                            * internal resolutions, aspect ratios, timings, sampling rate, etc.
+                                            * Calling this can require a full reinitialization of video/audio
+                                            * drivers in the frontend,
+                                            *
+                                            * so it is important to call it very sparingly, and usually only with
+                                            * the users explicit consent.
+                                            * An eventual driver reinitialize will happen so that video and
+                                            * audio callbacks
+                                            * happening after this call within the same retro_run() call will
+                                            * target the newly initialized driver.
+                                            *
+                                            * This callback makes it possible to support configurable resolutions
+                                            * in games, which can be useful to
+                                            * avoid setting the "worst case" in max_width/max_height.
+                                            *
+                                            * ***HIGHLY RECOMMENDED*** Do not call this callback every time
+                                            * resolution changes in an emulator core if it's
+                                            * expected to be a temporary change, for the reasons of possible
+                                            * driver reinitialization.
+                                            * This call is not a free pass for not trying to provide
+                                            * correct values in retro_get_system_av_info(). If you need to change
+                                            * things like aspect ratio or nominal width/height,
+                                            * use RETRO_ENVIRONMENT_SET_GEOMETRY, which is a softer variant
+                                            * of SET_SYSTEM_AV_INFO.
+                                            *
+                                            * If this returns false, the frontend does not acknowledge a
+                                            * changed av_info struct.
+                                            */
+#define RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK 33
+                                           /* const struct retro_get_proc_address_interface * --
+                                            * Allows a libretro core to announce support for the
+                                            * get_proc_address() interface.
+                                            * This interface allows for a standard way to extend libretro where
+                                            * use of environment calls are too indirect,
+                                            * e.g. for cases where the frontend wants to call directly into the core.
+                                            *
+                                            * If a core wants to expose this interface, SET_PROC_ADDRESS_CALLBACK
+                                            * **MUST** be called from within retro_set_environment().
+                                            */
+#define RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO 34
+                                           /* const struct retro_subsystem_info * --
+                                            * This environment call introduces the concept of libretro "subsystems".
+                                            * A subsystem is a variant of a libretro core which supports
+                                            * different kinds of games.
+                                            * The purpose of this is to support e.g. emulators which might
+                                            * have special needs, e.g. Super Nintendo's Super GameBoy, Sufami Turbo.
+                                            * It can also be used to pick among subsystems in an explicit way
+                                            * if the libretro implementation is a multi-system emulator itself.
+                                            *
+                                            * Loading a game via a subsystem is done with retro_load_game_special(),
+                                            * and this environment call allows a libretro core to expose which
+                                            * subsystems are supported for use with retro_load_game_special().
+                                            * A core passes an array of retro_game_special_info which is terminated
+                                            * with a zeroed out retro_game_special_info struct.
+                                            *
+                                            * If a core wants to use this functionality, SET_SUBSYSTEM_INFO
+                                            * **MUST** be called from within retro_set_environment().
+                                            */
+#define RETRO_ENVIRONMENT_SET_CONTROLLER_INFO 35
+                                           /* const struct retro_controller_info * --
+                                            * This environment call lets a libretro core tell the frontend
+                                            * which controller subclasses are recognized in calls to
+                                            * retro_set_controller_port_device().
+                                            *
+                                            * Some emulators such as Super Nintendo support multiple lightgun
+                                            * types which must be specifically selected from. It is therefore
+                                            * sometimes necessary for a frontend to be able to tell the core
+                                            * about a special kind of input device which is not specifcally
+                                            * provided by the Libretro API.
+                                            *
+                                            * In order for a frontend to understand the workings of those devices,
+                                            * they must be defined as a specialized subclass of the generic device
+                                            * types already defined in the libretro API.
+                                            *
+                                            * The core must pass an array of const struct retro_controller_info which
+                                            * is terminated with a blanked out struct. Each element of the
+                                            * retro_controller_info struct corresponds to the ascending port index
+                                            * that is passed to retro_set_controller_port_device() when that function
+                                            * is called to indicate to the core that the frontend has changed the
+                                            * active device subclass. SEE ALSO: retro_set_controller_port_device()
+                                            *
+                                            * The ascending input port indexes provided by the core in the struct
+                                            * are generally presented by frontends as ascending User # or Player #,
+                                            * such as Player 1, Player 2, Player 3, etc. Which device subclasses are
+                                            * supported can vary per input port.
+                                            *
+                                            * The first inner element of each entry in the retro_controller_info array
+                                            * is a retro_controller_description struct that specifies the names and
+                                            * codes of all device subclasses that are available for the corresponding
+                                            * User or Player, beginning with the generic Libretro device that the
+                                            * subclasses are derived from. The second inner element of each entry is the
+                                            * total number of subclasses that are listed in the retro_controller_description.
+                                            *
+                                            * NOTE: Even if special device types are set in the libretro core,
+                                            * libretro should only poll input based on the base input device types.
+                                            */
+#define RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* const struct retro_memory_map * --
+                                            * This environment call lets a libretro core tell the frontend
+                                            * about the memory maps this core emulates.
+                                            * This can be used to implement, for example, cheats in a core-agnostic way.
+                                            *
+                                            * Should only be used by emulators; it doesn't make much sense for
+                                            * anything else.
+                                            * It is recommended to expose all relevant pointers through
+                                            * retro_get_memory_* as well.
+                                            *
+                                            * Can be called from retro_init and retro_load_game.
+                                            */
+#define RETRO_ENVIRONMENT_SET_GEOMETRY 37
+                                           /* const struct retro_game_geometry * --
+                                            * This environment call is similar to SET_SYSTEM_AV_INFO for changing
+                                            * video parameters, but provides a guarantee that drivers will not be
+                                            * reinitialized.
+                                            * This can only be called from within retro_run().
+                                            *
+                                            * The purpose of this call is to allow a core to alter nominal
+                                            * width/heights as well as aspect ratios on-the-fly, which can be
+                                            * useful for some emulators to change in run-time.
+                                            *
+                                            * max_width/max_height arguments are ignored and cannot be changed
+                                            * with this call as this could potentially require a reinitialization or a
+                                            * non-constant time operation.
+                                            * If max_width/max_height are to be changed, SET_SYSTEM_AV_INFO is required.
+                                            *
+                                            * A frontend must guarantee that this environment call completes in
+                                            * constant time.
+                                            */
+#define RETRO_ENVIRONMENT_GET_USERNAME 38
+                                           /* const char **
+                                            * Returns the specified username of the frontend, if specified by the user.
+                                            * This username can be used as a nickname for a core that has online facilities
+                                            * or any other mode where personalization of the user is desirable.
+                                            * The returned value can be NULL.
+                                            * If this environ callback is used by a core that requires a valid username,
+                                            * a default username should be specified by the core.
+                                            */
+#define RETRO_ENVIRONMENT_GET_LANGUAGE 39
+                                           /* unsigned * --
+                                            * Returns the specified language of the frontend, if specified by the user.
+                                            * It can be used by the core for localization purposes.
+                                            */
+#define RETRO_ENVIRONMENT_GET_CURRENT_SOFTWARE_FRAMEBUFFER (40 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* struct retro_framebuffer * --
+                                            * Returns a preallocated framebuffer which the core can use for rendering
+                                            * the frame into when not using SET_HW_RENDER.
+                                            * The framebuffer returned from this call must not be used
+                                            * after the current call to retro_run() returns.
+                                            *
+                                            * The goal of this call is to allow zero-copy behavior where a core
+                                            * can render directly into video memory, avoiding extra bandwidth cost by copying
+                                            * memory from core to video memory.
+                                            *
+                                            * If this call succeeds and the core renders into it,
+                                            * the framebuffer pointer and pitch can be passed to retro_video_refresh_t.
+                                            * If the buffer from GET_CURRENT_SOFTWARE_FRAMEBUFFER is to be used,
+                                            * the core must pass the exact
+                                            * same pointer as returned by GET_CURRENT_SOFTWARE_FRAMEBUFFER;
+                                            * i.e. passing a pointer which is offset from the
+                                            * buffer is undefined. The width, height and pitch parameters
+                                            * must also match exactly to the values obtained from GET_CURRENT_SOFTWARE_FRAMEBUFFER.
+                                            *
+                                            * It is possible for a frontend to return a different pixel format
+                                            * than the one used in SET_PIXEL_FORMAT. This can happen if the frontend
+                                            * needs to perform conversion.
+                                            *
+                                            * It is still valid for a core to render to a different buffer
+                                            * even if GET_CURRENT_SOFTWARE_FRAMEBUFFER succeeds.
+                                            *
+                                            * A frontend must make sure that the pointer obtained from this function is
+                                            * writeable (and readable).
+                                            */
+#define RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE (41 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* const struct retro_hw_render_interface ** --
+                                            * Returns an API specific rendering interface for accessing API specific data.
+                                            * Not all HW rendering APIs support or need this.
+                                            * The contents of the returned pointer is specific to the rendering API
+                                            * being used. See the various headers like libretro_vulkan.h, etc.
+                                            *
+                                            * GET_HW_RENDER_INTERFACE cannot be called before context_reset has been called.
+                                            * Similarly, after context_destroyed callback returns,
+                                            * the contents of the HW_RENDER_INTERFACE are invalidated.
+                                            */
+#define RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS (42 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* const bool * --
+                                            * If true, the libretro implementation supports achievements
+                                            * either via memory descriptors set with RETRO_ENVIRONMENT_SET_MEMORY_MAPS
+                                            * or via retro_get_memory_data/retro_get_memory_size.
+                                            *
+                                            * This must be called before the first call to retro_run.
+                                            */
+#define RETRO_ENVIRONMENT_SET_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE (43 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* const struct retro_hw_render_context_negotiation_interface * --
+                                            * Sets an interface which lets the libretro core negotiate with frontend how a context is created.
+                                            * The semantics of this interface depends on which API is used in SET_HW_RENDER earlier.
+                                            * This interface will be used when the frontend is trying to create a HW rendering context,
+                                            * so it will be used after SET_HW_RENDER, but before the context_reset callback.
+                                            */
+#define RETRO_ENVIRONMENT_SET_SERIALIZATION_QUIRKS 44
+                                           /* uint64_t * --
+                                            * Sets quirk flags associated with serialization. The frontend will zero any flags it doesn't
+                                            * recognize or support. Should be set in either retro_init or retro_load_game, but not both.
+                                            */
+#define RETRO_ENVIRONMENT_SET_HW_SHARED_CONTEXT (44 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* N/A (null) * --
+                                            * The frontend will try to use a 'shared' hardware context (mostly applicable
+                                            * to OpenGL) when a hardware context is being set up.
+                                            *
+                                            * Returns true if the frontend supports shared hardware contexts and false
+                                            * if the frontend does not support shared hardware contexts.
+                                            *
+                                            * This will do nothing on its own until SET_HW_RENDER env callbacks are
+                                            * being used.
+                                            */
+#define RETRO_ENVIRONMENT_GET_VFS_INTERFACE (45 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* struct retro_vfs_interface_info * --
+                                            * Gets access to the VFS interface.
+                                            * VFS presence needs to be queried prior to load_game or any
+                                            * get_system/save/other_directory being called to let front end know
+                                            * core supports VFS before it starts handing out paths.
+                                            * It is recomended to do so in retro_set_environment
+                                            */
+#define RETRO_ENVIRONMENT_GET_LED_INTERFACE (46 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* struct retro_led_interface * --
+                                            * Gets an interface which is used by a libretro core to set
+                                            * state of LEDs.
+                                            */
+#define RETRO_ENVIRONMENT_GET_AUDIO_VIDEO_ENABLE (47 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* int * --
+                                            * Tells the core if the frontend wants audio or video.
+                                            * If disabled, the frontend will discard the audio or video,
+                                            * so the core may decide to skip generating a frame or generating audio.
+                                            * This is mainly used for increasing performance.
+                                            * Bit 0 (value 1): Enable Video
+                                            * Bit 1 (value 2): Enable Audio
+                                            * Bit 2 (value 4): Use Fast Savestates.
+                                            * Bit 3 (value 8): Hard Disable Audio
+                                            * Other bits are reserved for future use and will default to zero.
+                                            * If video is disabled:
+                                            * * The frontend wants the core to not generate any video,
+                                            *   including presenting frames via hardware acceleration.
+                                            * * The frontend's video frame callback will do nothing.
+                                            * * After running the frame, the video output of the next frame should be
+                                            *   no different than if video was enabled, and saving and loading state
+                                            *   should have no issues.
+                                            * If audio is disabled:
+                                            * * The frontend wants the core to not generate any audio.
+                                            * * The frontend's audio callbacks will do nothing.
+                                            * * After running the frame, the audio output of the next frame should be
+                                            *   no different than if audio was enabled, and saving and loading state
+                                            *   should have no issues.
+                                            * Fast Savestates:
+                                            * * Guaranteed to be created by the same binary that will load them.
+                                            * * Will not be written to or read from the disk.
+                                            * * Suggest that the core assumes loading state will succeed.
+                                            * * Suggest that the core updates its memory buffers in-place if possible.
+                                            * * Suggest that the core skips clearing memory.
+                                            * * Suggest that the core skips resetting the system.
+                                            * * Suggest that the core may skip validation steps.
+                                            * Hard Disable Audio:
+                                            * * Used for a secondary core when running ahead.
+                                            * * Indicates that the frontend will never need audio from the core.
+                                            * * Suggests that the core may stop synthesizing audio, but this should not
+                                            *   compromise emulation accuracy.
+                                            * * Audio output for the next frame does not matter, and the frontend will
+                                            *   never need an accurate audio state in the future.
+                                            * * State will never be saved when using Hard Disable Audio.
+                                            */
+#define RETRO_ENVIRONMENT_GET_MIDI_INTERFACE (48 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* struct retro_midi_interface ** --
+                                            * Returns a MIDI interface that can be used for raw data I/O.
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_FASTFORWARDING (49 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                            /* bool * --
+                                            * Boolean value that indicates whether or not the frontend is in
+                                            * fastforwarding mode.
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_TARGET_REFRESH_RATE (50 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                            /* float * --
+                                            * Float value that lets us know what target refresh rate
+                                            * is curently in use by the frontend.
+                                            *
+                                            * The core can use the returned value to set an ideal
+                                            * refresh rate/framerate.
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_INPUT_BITMASKS (51 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                            /* bool * --
+                                            * Boolean value that indicates whether or not the frontend supports
+                                            * input bitmasks being returned by retro_input_state_t. The advantage
+                                            * of this is that retro_input_state_t has to be only called once to
+                                            * grab all button states instead of multiple times.
+                                            *
+                                            * If it returns true, you can pass RETRO_DEVICE_ID_JOYPAD_MASK as 'id'
+                                            * to retro_input_state_t (make sure 'device' is set to RETRO_DEVICE_JOYPAD).
+                                            * It will return a bitmask of all the digital buttons.
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION 52
+                                           /* unsigned * --
+                                            * Unsigned value is the API version number of the core options
+                                            * interface supported by the frontend. If callback return false,
+                                            * API version is assumed to be 0.
+                                            *
+                                            * In legacy code, core options are set by passing an array of
+                                            * retro_variable structs to RETRO_ENVIRONMENT_SET_VARIABLES.
+                                            * This may be still be done regardless of the core options
+                                            * interface version.
+                                            *
+                                            * If version is >= 1 however, core options may instead be set by
+                                            * passing an array of retro_core_option_definition structs to
+                                            * RETRO_ENVIRONMENT_SET_CORE_OPTIONS, or a 2D array of
+                                            * retro_core_option_definition structs to RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL.
+                                            * This allows the core to additionally set option sublabel information
+                                            * and/or provide localisation support.
+                                            *
+                                            * If version is >= 2, core options may instead be set by passing
+                                            * a retro_core_options_v2 struct to RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2,
+                                            * or an array of retro_core_options_v2 structs to
+                                            * RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2_INTL. This allows the core
+                                            * to additionally set optional core option category information
+                                            * for frontends with core option category support.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS 53
+                                           /* const struct retro_core_option_definition ** --
+                                            * Allows an implementation to signal the environment
+                                            * which variables it might want to check for later using
+                                            * GET_VARIABLE.
+                                            * This allows the frontend to present these variables to
+                                            * a user dynamically.
+                                            * This should only be called if RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION
+                                            * returns an API version of >= 1.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_VARIABLES.
+                                            * This should be called the first time as early as
+                                            * possible (ideally in retro_set_environment).
+                                            * Afterwards it may be called again for the core to communicate
+                                            * updated options to the frontend, but the number of core
+                                            * options must not change from the number in the initial call.
+                                            *
+                                            * 'data' points to an array of retro_core_option_definition structs
+                                            * terminated by a { NULL, NULL, NULL, {{0}}, NULL } element.
+                                            * retro_core_option_definition::key should be namespaced to not collide
+                                            * with other implementations' keys. e.g. A core called
+                                            * 'foo' should use keys named as 'foo_option'.
+                                            * retro_core_option_definition::desc should contain a human readable
+                                            * description of the key.
+                                            * retro_core_option_definition::info should contain any additional human
+                                            * readable information text that a typical user may need to
+                                            * understand the functionality of the option.
+                                            * retro_core_option_definition::values is an array of retro_core_option_value
+                                            * structs terminated by a { NULL, NULL } element.
+                                            * > retro_core_option_definition::values[index].value is an expected option
+                                            *   value.
+                                            * > retro_core_option_definition::values[index].label is a human readable
+                                            *   label used when displaying the value on screen. If NULL,
+                                            *   the value itself is used.
+                                            * retro_core_option_definition::default_value is the default core option
+                                            * setting. It must match one of the expected option values in the
+                                            * retro_core_option_definition::values array. If it does not, or the
+                                            * default value is NULL, the first entry in the
+                                            * retro_core_option_definition::values array is treated as the default.
+                                            *
+                                            * The number of possible option values should be very limited,
+                                            * and must be less than RETRO_NUM_CORE_OPTION_VALUES_MAX.
+                                            * i.e. it should be feasible to cycle through options
+                                            * without a keyboard.
+                                            *
+                                            * Example entry:
+                                            * {
+                                            *     "foo_option",
+                                            *     "Speed hack coprocessor X",
+                                            *     "Provides increased performance at the expense of reduced accuracy",
+                                            * 	  {
+                                            *         { "false",    NULL },
+                                            *         { "true",     NULL },
+                                            *         { "unstable", "Turbo (Unstable)" },
+                                            *         { NULL, NULL },
+                                            *     },
+                                            *     "false"
+                                            * }
+                                            *
+                                            * Only strings are operated on. The possible values will
+                                            * generally be displayed and stored as-is by the frontend.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL 54
+                                           /* const struct retro_core_options_intl * --
+                                            * Allows an implementation to signal the environment
+                                            * which variables it might want to check for later using
+                                            * GET_VARIABLE.
+                                            * This allows the frontend to present these variables to
+                                            * a user dynamically.
+                                            * This should only be called if RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION
+                                            * returns an API version of >= 1.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_VARIABLES.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_CORE_OPTIONS.
+                                            * This should be called the first time as early as
+                                            * possible (ideally in retro_set_environment).
+                                            * Afterwards it may be called again for the core to communicate
+                                            * updated options to the frontend, but the number of core
+                                            * options must not change from the number in the initial call.
+                                            *
+                                            * This is fundamentally the same as RETRO_ENVIRONMENT_SET_CORE_OPTIONS,
+                                            * with the addition of localisation support. The description of the
+                                            * RETRO_ENVIRONMENT_SET_CORE_OPTIONS callback should be consulted
+                                            * for further details.
+                                            *
+                                            * 'data' points to a retro_core_options_intl struct.
+                                            *
+                                            * retro_core_options_intl::us is a pointer to an array of
+                                            * retro_core_option_definition structs defining the US English
+                                            * core options implementation. It must point to a valid array.
+                                            *
+                                            * retro_core_options_intl::local is a pointer to an array of
+                                            * retro_core_option_definition structs defining core options for
+                                            * the current frontend language. It may be NULL (in which case
+                                            * retro_core_options_intl::us is used by the frontend). Any items
+                                            * missing from this array will be read from retro_core_options_intl::us
+                                            * instead.
+                                            *
+                                            * NOTE: Default core option values are always taken from the
+                                            * retro_core_options_intl::us array. Any default values in
+                                            * retro_core_options_intl::local array will be ignored.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY 55
+                                           /* struct retro_core_option_display * --
+                                            *
+                                            * Allows an implementation to signal the environment to show
+                                            * or hide a variable when displaying core options. This is
+                                            * considered a *suggestion*. The frontend is free to ignore
+                                            * this callback, and its implementation not considered mandatory.
+                                            *
+                                            * 'data' points to a retro_core_option_display struct
+                                            *
+                                            * retro_core_option_display::key is a variable identifier
+                                            * which has already been set by SET_VARIABLES/SET_CORE_OPTIONS.
+                                            *
+                                            * retro_core_option_display::visible is a boolean, specifying
+                                            * whether variable should be displayed
+                                            *
+                                            * Note that all core option variables will be set visible by
+                                            * default when calling SET_VARIABLES/SET_CORE_OPTIONS.
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_PREFERRED_HW_RENDER 56
+                                           /* unsigned * --
+                                            *
+                                            * Allows an implementation to ask frontend preferred hardware
+                                            * context to use. Core should use this information to deal
+                                            * with what specific context to request with SET_HW_RENDER.
+                                            *
+                                            * 'data' points to an unsigned variable
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_DISK_CONTROL_INTERFACE_VERSION 57
+                                           /* unsigned * --
+                                            * Unsigned value is the API version number of the disk control
+                                            * interface supported by the frontend. If callback return false,
+                                            * API version is assumed to be 0.
+                                            *
+                                            * In legacy code, the disk control interface is defined by passing
+                                            * a struct of type retro_disk_control_callback to
+                                            * RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE.
+                                            * This may be still be done regardless of the disk control
+                                            * interface version.
+                                            *
+                                            * If version is >= 1 however, the disk control interface may
+                                            * instead be defined by passing a struct of type
+                                            * retro_disk_control_ext_callback to
+                                            * RETRO_ENVIRONMENT_SET_DISK_CONTROL_EXT_INTERFACE.
+                                            * This allows the core to provide additional information about
+                                            * disk images to the frontend and/or enables extra
+                                            * disk control functionality by the frontend.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_DISK_CONTROL_EXT_INTERFACE 58
+                                           /* const struct retro_disk_control_ext_callback * --
+                                            * Sets an interface which frontend can use to eject and insert
+                                            * disk images, and also obtain information about individual
+                                            * disk image files registered by the core.
+                                            * This is used for games which consist of multiple images and
+                                            * must be manually swapped out by the user (e.g. PSX, floppy disk
+                                            * based systems).
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_MESSAGE_INTERFACE_VERSION 59
+                                           /* unsigned * --
+                                            * Unsigned value is the API version number of the message
+                                            * interface supported by the frontend. If callback returns
+                                            * false, API version is assumed to be 0.
+                                            *
+                                            * In legacy code, messages may be displayed in an
+                                            * implementation-specific manner by passing a struct
+                                            * of type retro_message to RETRO_ENVIRONMENT_SET_MESSAGE.
+                                            * This may be still be done regardless of the message
+                                            * interface version.
+                                            *
+                                            * If version is >= 1 however, messages may instead be
+                                            * displayed by passing a struct of type retro_message_ext
+                                            * to RETRO_ENVIRONMENT_SET_MESSAGE_EXT. This allows the
+                                            * core to specify message logging level, priority and
+                                            * destination (OSD, logging interface or both).
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_MESSAGE_EXT 60
+                                           /* const struct retro_message_ext * --
+                                            * Sets a message to be displayed in an implementation-specific
+                                            * manner for a certain amount of 'frames'. Additionally allows
+                                            * the core to specify message logging level, priority and
+                                            * destination (OSD, logging interface or both).
+                                            * Should not be used for trivial messages, which should simply be
+                                            * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a
+                                            * fallback, stderr).
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_INPUT_MAX_USERS 61
+                                           /* unsigned * --
+                                            * Unsigned value is the number of active input devices
+                                            * provided by the frontend. This may change between
+                                            * frames, but will remain constant for the duration
+                                            * of each frame.
+                                            * If callback returns true, a core need not poll any
+                                            * input device with an index greater than or equal to
+                                            * the number of active devices.
+                                            * If callback returns false, the number of active input
+                                            * devices is unknown. In this case, all input devices
+                                            * should be considered active.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK 62
+                                           /* const struct retro_audio_buffer_status_callback * --
+                                            * Lets the core know the occupancy level of the frontend
+                                            * audio buffer. Can be used by a core to attempt frame
+                                            * skipping in order to avoid buffer under-runs.
+                                            * A core may pass NULL to disable buffer status reporting
+                                            * in the frontend.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_MINIMUM_AUDIO_LATENCY 63
+                                           /* const unsigned * --
+                                            * Sets minimum frontend audio latency in milliseconds.
+                                            * Resultant audio latency may be larger than set value,
+                                            * or smaller if a hardware limit is encountered. A frontend
+                                            * is expected to honour requests up to 512 ms.
+                                            *
+                                            * - If value is less than current frontend
+                                            *   audio latency, callback has no effect
+                                            * - If value is zero, default frontend audio
+                                            *   latency is set
+                                            *
+                                            * May be used by a core to increase audio latency and
+                                            * therefore decrease the probability of buffer under-runs
+                                            * (crackling) when performing 'intensive' operations.
+                                            * A core utilising RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK
+                                            * to implement audio-buffer-based frame skipping may achieve
+                                            * optimal results by setting the audio latency to a 'high'
+                                            * (typically 6x or 8x) integer multiple of the expected
+                                            * frame time.
+                                            *
+                                            * WARNING: This can only be called from within retro_run().
+                                            * Calling this can require a full reinitialization of audio
+                                            * drivers in the frontend, so it is important to call it very
+                                            * sparingly, and usually only with the users explicit consent.
+                                            * An eventual driver reinitialize will happen so that audio
+                                            * callbacks happening after this call within the same retro_run()
+                                            * call will target the newly initialized driver.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_FASTFORWARDING_OVERRIDE 64
+                                           /* const struct retro_fastforwarding_override * --
+                                            * Used by a libretro core to override the current
+                                            * fastforwarding mode of the frontend.
+                                            * If NULL is passed to this function, the frontend
+                                            * will return true if fastforwarding override
+                                            * functionality is supported (no change in
+                                            * fastforwarding state will occur in this case).
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_CONTENT_INFO_OVERRIDE 65
+                                           /* const struct retro_system_content_info_override * --
+                                            * Allows an implementation to override 'global' content
+                                            * info parameters reported by retro_get_system_info().
+                                            * Overrides also affect subsystem content info parameters
+                                            * set via RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO.
+                                            * This function must be called inside retro_set_environment().
+                                            * If callback returns false, content info overrides
+                                            * are unsupported by the frontend, and will be ignored.
+                                            * If callback returns true, extended game info may be
+                                            * retrieved by calling RETRO_ENVIRONMENT_GET_GAME_INFO_EXT
+                                            * in retro_load_game() or retro_load_game_special().
+                                            *
+                                            * 'data' points to an array of retro_system_content_info_override
+                                            * structs terminated by a { NULL, false, false } element.
+                                            * If 'data' is NULL, no changes will be made to the frontend;
+                                            * a core may therefore pass NULL in order to test whether
+                                            * the RETRO_ENVIRONMENT_SET_CONTENT_INFO_OVERRIDE and
+                                            * RETRO_ENVIRONMENT_GET_GAME_INFO_EXT callbacks are supported
+                                            * by the frontend.
+                                            *
+                                            * For struct member descriptions, see the definition of
+                                            * struct retro_system_content_info_override.
+                                            *
+                                            * Example:
+                                            *
+                                            * - struct retro_system_info:
+                                            * {
+                                            *    "My Core",                      // library_name
+                                            *    "v1.0",                         // library_version
+                                            *    "m3u|md|cue|iso|chd|sms|gg|sg", // valid_extensions
+                                            *    true,                           // need_fullpath
+                                            *    false                           // block_extract
+                                            * }
+                                            *
+                                            * - Array of struct retro_system_content_info_override:
+                                            * {
+                                            *    {
+                                            *       "md|sms|gg", // extensions
+                                            *       false,       // need_fullpath
+                                            *       true         // persistent_data
+                                            *    },
+                                            *    {
+                                            *       "sg",        // extensions
+                                            *       false,       // need_fullpath
+                                            *       false        // persistent_data
+                                            *    },
+                                            *    { NULL, false, false }
+                                            * }
+                                            *
+                                            * Result:
+                                            * - Files of type m3u, cue, iso, chd will not be
+                                            *   loaded by the frontend. Frontend will pass a
+                                            *   valid path to the core, and core will handle
+                                            *   loading internally
+                                            * - Files of type md, sms, gg will be loaded by
+                                            *   the frontend. A valid memory buffer will be
+                                            *   passed to the core. This memory buffer will
+                                            *   remain valid until retro_deinit() returns
+                                            * - Files of type sg will be loaded by the frontend.
+                                            *   A valid memory buffer will be passed to the core.
+                                            *   This memory buffer will remain valid until
+                                            *   retro_load_game() (or retro_load_game_special())
+                                            *   returns
+                                            *
+                                            * NOTE: If an extension is listed multiple times in
+                                            * an array of retro_system_content_info_override
+                                            * structs, only the first instance will be registered
+                                            */
+
+#define RETRO_ENVIRONMENT_GET_GAME_INFO_EXT 66
+                                           /* const struct retro_game_info_ext ** --
+                                            * Allows an implementation to fetch extended game
+                                            * information, providing additional content path
+                                            * and memory buffer status details.
+                                            * This function may only be called inside
+                                            * retro_load_game() or retro_load_game_special().
+                                            * If callback returns false, extended game information
+                                            * is unsupported by the frontend. In this case, only
+                                            * regular retro_game_info will be available.
+                                            * RETRO_ENVIRONMENT_GET_GAME_INFO_EXT is guaranteed
+                                            * to return true if RETRO_ENVIRONMENT_SET_CONTENT_INFO_OVERRIDE
+                                            * returns true.
+                                            *
+                                            * 'data' points to an array of retro_game_info_ext structs.
+                                            *
+                                            * For struct member descriptions, see the definition of
+                                            * struct retro_game_info_ext.
+                                            *
+                                            * - If function is called inside retro_load_game(),
+                                            *   the retro_game_info_ext array is guaranteed to
+                                            *   have a size of 1 - i.e. the returned pointer may
+                                            *   be used to access directly the members of the
+                                            *   first retro_game_info_ext struct, for example:
+                                            *
+                                            *      struct retro_game_info_ext *game_info_ext;
+                                            *      if (environ_cb(RETRO_ENVIRONMENT_GET_GAME_INFO_EXT, &game_info_ext))
+                                            *         printf("Content Directory: %s\n", game_info_ext->dir);
+                                            *
+                                            * - If the function is called inside retro_load_game_special(),
+                                            *   the retro_game_info_ext array is guaranteed to have a
+                                            *   size equal to the num_info argument passed to
+                                            *   retro_load_game_special()
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2 67
+                                           /* const struct retro_core_options_v2 * --
+                                            * Allows an implementation to signal the environment
+                                            * which variables it might want to check for later using
+                                            * GET_VARIABLE.
+                                            * This allows the frontend to present these variables to
+                                            * a user dynamically.
+                                            * This should only be called if RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION
+                                            * returns an API version of >= 2.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_VARIABLES.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_CORE_OPTIONS.
+                                            * This should be called the first time as early as
+                                            * possible (ideally in retro_set_environment).
+                                            * Afterwards it may be called again for the core to communicate
+                                            * updated options to the frontend, but the number of core
+                                            * options must not change from the number in the initial call.
+                                            * If RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION returns an API
+                                            * version of >= 2, this callback is guaranteed to succeed
+                                            * (i.e. callback return value does not indicate success)
+                                            * If callback returns true, frontend has core option category
+                                            * support.
+                                            * If callback returns false, frontend does not have core option
+                                            * category support.
+                                            *
+                                            * 'data' points to a retro_core_options_v2 struct, containing
+                                            * of two pointers:
+                                            * - retro_core_options_v2::categories is an array of
+                                            *   retro_core_option_v2_category structs terminated by a
+                                            *   { NULL, NULL, NULL } element. If retro_core_options_v2::categories
+                                            *   is NULL, all core options will have no category and will be shown
+                                            *   at the top level of the frontend core option interface. If frontend
+                                            *   does not have core option category support, categories array will
+                                            *   be ignored.
+                                            * - retro_core_options_v2::definitions is an array of
+                                            *   retro_core_option_v2_definition structs terminated by a
+                                            *   { NULL, NULL, NULL, NULL, NULL, NULL, {{0}}, NULL }
+                                            *   element.
+                                            *
+                                            * >> retro_core_option_v2_category notes:
+                                            *
+                                            * - retro_core_option_v2_category::key should contain string
+                                            *   that uniquely identifies the core option category. Valid
+                                            *   key characters are [a-z, A-Z, 0-9, _, -]
+                                            *   Namespace collisions with other implementations' category
+                                            *   keys are permitted.
+                                            * - retro_core_option_v2_category::desc should contain a human
+                                            *   readable description of the category key.
+                                            * - retro_core_option_v2_category::info should contain any
+                                            *   additional human readable information text that a typical
+                                            *   user may need to understand the nature of the core option
+                                            *   category.
+                                            *
+                                            * Example entry:
+                                            * {
+                                            *     "advanced_settings",
+                                            *     "Advanced",
+                                            *     "Options affecting low-level emulation performance and accuracy."
+                                            * }
+                                            *
+                                            * >> retro_core_option_v2_definition notes:
+                                            *
+                                            * - retro_core_option_v2_definition::key should be namespaced to not
+                                            *   collide with other implementations' keys. e.g. A core called
+                                            *   'foo' should use keys named as 'foo_option'. Valid key characters
+                                            *   are [a-z, A-Z, 0-9, _, -].
+                                            * - retro_core_option_v2_definition::desc should contain a human readable
+                                            *   description of the key. Will be used when the frontend does not
+                                            *   have core option category support. Examples: "Aspect Ratio" or
+                                            *   "Video > Aspect Ratio".
+                                            * - retro_core_option_v2_definition::desc_categorized should contain a
+                                            *   human readable description of the key, which will be used when
+                                            *   frontend has core option category support. Example: "Aspect Ratio",
+                                            *   where associated retro_core_option_v2_category::desc is "Video".
+                                            *   If empty or NULL, the string specified by
+                                            *   retro_core_option_v2_definition::desc will be used instead.
+                                            *   retro_core_option_v2_definition::desc_categorized will be ignored
+                                            *   if retro_core_option_v2_definition::category_key is empty or NULL.
+                                            * - retro_core_option_v2_definition::info should contain any additional
+                                            *   human readable information text that a typical user may need to
+                                            *   understand the functionality of the option.
+                                            * - retro_core_option_v2_definition::info_categorized should contain
+                                            *   any additional human readable information text that a typical user
+                                            *   may need to understand the functionality of the option, and will be
+                                            *   used when frontend has core option category support. This is provided
+                                            *   to accommodate the case where info text references an option by
+                                            *   name/desc, and the desc/desc_categorized text for that option differ.
+                                            *   If empty or NULL, the string specified by
+                                            *   retro_core_option_v2_definition::info will be used instead.
+                                            *   retro_core_option_v2_definition::info_categorized will be ignored
+                                            *   if retro_core_option_v2_definition::category_key is empty or NULL.
+                                            * - retro_core_option_v2_definition::category_key should contain a
+                                            *   category identifier (e.g. "video" or "audio") that will be
+                                            *   assigned to the core option if frontend has core option category
+                                            *   support. A categorized option will be shown in a subsection/
+                                            *   submenu of the frontend core option interface. If key is empty
+                                            *   or NULL, or if key does not match one of the
+                                            *   retro_core_option_v2_category::key values in the associated
+                                            *   retro_core_option_v2_category array, option will have no category
+                                            *   and will be shown at the top level of the frontend core option
+                                            *   interface.
+                                            * - retro_core_option_v2_definition::values is an array of
+                                            *   retro_core_option_value structs terminated by a { NULL, NULL }
+                                            *   element.
+                                            * --> retro_core_option_v2_definition::values[index].value is an
+                                            *     expected option value.
+                                            * --> retro_core_option_v2_definition::values[index].label is a
+                                            *     human readable label used when displaying the value on screen.
+                                            *     If NULL, the value itself is used.
+                                            * - retro_core_option_v2_definition::default_value is the default
+                                            *   core option setting. It must match one of the expected option
+                                            *   values in the retro_core_option_v2_definition::values array. If
+                                            *   it does not, or the default value is NULL, the first entry in the
+                                            *   retro_core_option_v2_definition::values array is treated as the
+                                            *   default.
+                                            *
+                                            * The number of possible option values should be very limited,
+                                            * and must be less than RETRO_NUM_CORE_OPTION_VALUES_MAX.
+                                            * i.e. it should be feasible to cycle through options
+                                            * without a keyboard.
+                                            *
+                                            * Example entries:
+                                            *
+                                            * - Uncategorized:
+                                            *
+                                            * {
+                                            *     "foo_option",
+                                            *     "Speed hack coprocessor X",
+                                            *     NULL,
+                                            *     "Provides increased performance at the expense of reduced accuracy.",
+                                            *     NULL,
+                                            *     NULL,
+                                            * 	  {
+                                            *         { "false",    NULL },
+                                            *         { "true",     NULL },
+                                            *         { "unstable", "Turbo (Unstable)" },
+                                            *         { NULL, NULL },
+                                            *     },
+                                            *     "false"
+                                            * }
+                                            *
+                                            * - Categorized:
+                                            *
+                                            * {
+                                            *     "foo_option",
+                                            *     "Advanced > Speed hack coprocessor X",
+                                            *     "Speed hack coprocessor X",
+                                            *     "Setting 'Advanced > Speed hack coprocessor X' to 'true' or 'Turbo' provides increased performance at the expense of reduced accuracy",
+                                            *     "Setting 'Speed hack coprocessor X' to 'true' or 'Turbo' provides increased performance at the expense of reduced accuracy",
+                                            *     "advanced_settings",
+                                            * 	  {
+                                            *         { "false",    NULL },
+                                            *         { "true",     NULL },
+                                            *         { "unstable", "Turbo (Unstable)" },
+                                            *         { NULL, NULL },
+                                            *     },
+                                            *     "false"
+                                            * }
+                                            *
+                                            * Only strings are operated on. The possible values will
+                                            * generally be displayed and stored as-is by the frontend.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2_INTL 68
+                                           /* const struct retro_core_options_v2_intl * --
+                                            * Allows an implementation to signal the environment
+                                            * which variables it might want to check for later using
+                                            * GET_VARIABLE.
+                                            * This allows the frontend to present these variables to
+                                            * a user dynamically.
+                                            * This should only be called if RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION
+                                            * returns an API version of >= 2.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_VARIABLES.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_CORE_OPTIONS.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL.
+                                            * This should be called instead of RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2.
+                                            * This should be called the first time as early as
+                                            * possible (ideally in retro_set_environment).
+                                            * Afterwards it may be called again for the core to communicate
+                                            * updated options to the frontend, but the number of core
+                                            * options must not change from the number in the initial call.
+                                            * If RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION returns an API
+                                            * version of >= 2, this callback is guaranteed to succeed
+                                            * (i.e. callback return value does not indicate success)
+                                            * If callback returns true, frontend has core option category
+                                            * support.
+                                            * If callback returns false, frontend does not have core option
+                                            * category support.
+                                            *
+                                            * This is fundamentally the same as RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2,
+                                            * with the addition of localisation support. The description of the
+                                            * RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2 callback should be consulted
+                                            * for further details.
+                                            *
+                                            * 'data' points to a retro_core_options_v2_intl struct.
+                                            *
+                                            * - retro_core_options_v2_intl::us is a pointer to a
+                                            *   retro_core_options_v2 struct defining the US English
+                                            *   core options implementation. It must point to a valid struct.
+                                            *
+                                            * - retro_core_options_v2_intl::local is a pointer to a
+                                            *   retro_core_options_v2 struct defining core options for
+                                            *   the current frontend language. It may be NULL (in which case
+                                            *   retro_core_options_v2_intl::us is used by the frontend). Any items
+                                            *   missing from this struct will be read from
+                                            *   retro_core_options_v2_intl::us instead.
+                                            *
+                                            * NOTE: Default core option values are always taken from the
+                                            * retro_core_options_v2_intl::us struct. Any default values in
+                                            * the retro_core_options_v2_intl::local struct will be ignored.
+                                            */
+
+#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_UPDATE_DISPLAY_CALLBACK 69
+                                           /* const struct retro_core_options_update_display_callback * --
+                                            * Allows a frontend to signal that a core must update
+                                            * the visibility of any dynamically hidden core options,
+                                            * and enables the frontend to detect visibility changes.
+                                            * Used by the frontend to update the menu display status
+                                            * of core options without requiring a call of retro_run().
+                                            * Must be called in retro_set_environment().
+                                            */
+
+/* VFS functionality */
+
+/* File paths:
+ * File paths passed as parameters when using this API shall be well formed UNIX-style,
+ * using "/" (unquoted forward slash) as directory separator regardless of the platform's native separator.
+ * Paths shall also include at least one forward slash ("game.bin" is an invalid path, use "./game.bin" instead).
+ * Other than the directory separator, cores shall not make assumptions about path format:
+ * "C:/path/game.bin", "http://example.com/game.bin", "#game/game.bin", "./game.bin" (without quotes) are all valid paths.
+ * Cores may replace the basename or remove path components from the end, and/or add new components;
+ * however, cores shall not append "./", "../" or multiple consecutive forward slashes ("//") to paths they request to front end.
+ * The frontend is encouraged to make such paths work as well as it can, but is allowed to give up if the core alters paths too much.
+ * Frontends are encouraged, but not required, to support native file system paths (modulo replacing the directory separator, if applicable).
+ * Cores are allowed to try using them, but must remain functional if the front rejects such requests.
+ * Cores are encouraged to use the libretro-common filestream functions for file I/O,
+ * as they seamlessly integrate with VFS, deal with directory separator replacement as appropriate
+ * and provide platform-specific fallbacks in cases where front ends do not support VFS. */
+
+/* Opaque file handle
+ * Introduced in VFS API v1 */
+struct retro_vfs_file_handle;
+
+/* Opaque directory handle
+ * Introduced in VFS API v3 */
+struct retro_vfs_dir_handle;
+
+/* File open flags
+ * Introduced in VFS API v1 */
+#define RETRO_VFS_FILE_ACCESS_READ            (1 << 0) /* Read only mode */
+#define RETRO_VFS_FILE_ACCESS_WRITE           (1 << 1) /* Write only mode, discard contents and overwrites existing file unless RETRO_VFS_FILE_ACCESS_UPDATE is also specified */
+#define RETRO_VFS_FILE_ACCESS_READ_WRITE      (RETRO_VFS_FILE_ACCESS_READ | RETRO_VFS_FILE_ACCESS_WRITE) /* Read-write mode, discard contents and overwrites existing file unless RETRO_VFS_FILE_ACCESS_UPDATE is also specified*/
+#define RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING (1 << 2) /* Prevents discarding content of existing files opened for writing */
+
+/* These are only hints. The frontend may choose to ignore them. Other than RAM/CPU/etc use,
+   and how they react to unlikely external interference (for example someone else writing to that file,
+   or the file's server going down), behavior will not change. */
+#define RETRO_VFS_FILE_ACCESS_HINT_NONE              (0)
+/* Indicate that the file will be accessed many times. The frontend should aggressively cache everything. */
+#define RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS   (1 << 0)
+
+/* Seek positions */
+#define RETRO_VFS_SEEK_POSITION_START    0
+#define RETRO_VFS_SEEK_POSITION_CURRENT  1
+#define RETRO_VFS_SEEK_POSITION_END      2
+
+/* stat() result flags
+ * Introduced in VFS API v3 */
+#define RETRO_VFS_STAT_IS_VALID               (1 << 0)
+#define RETRO_VFS_STAT_IS_DIRECTORY           (1 << 1)
+#define RETRO_VFS_STAT_IS_CHARACTER_SPECIAL   (1 << 2)
+
+/* Get path from opaque handle. Returns the exact same path passed to file_open when getting the handle
+ * Introduced in VFS API v1 */
+typedef const char *(RETRO_CALLCONV *retro_vfs_get_path_t)(struct retro_vfs_file_handle *stream);
+
+/* Open a file for reading or writing. If path points to a directory, this will
+ * fail. Returns the opaque file handle, or NULL for error.
+ * Introduced in VFS API v1 */
+typedef struct retro_vfs_file_handle *(RETRO_CALLCONV *retro_vfs_open_t)(const char *path, unsigned mode, unsigned hints);
+
+/* Close the file and release its resources. Must be called if open_file returns non-NULL. Returns 0 on success, -1 on failure.
+ * Whether the call succeeds ot not, the handle passed as parameter becomes invalid and should no longer be used.
+ * Introduced in VFS API v1 */
+typedef int (RETRO_CALLCONV *retro_vfs_close_t)(struct retro_vfs_file_handle *stream);
+
+/* Return the size of the file in bytes, or -1 for error.
+ * Introduced in VFS API v1 */
+typedef int64_t (RETRO_CALLCONV *retro_vfs_size_t)(struct retro_vfs_file_handle *stream);
+
+/* Truncate file to specified size. Returns 0 on success or -1 on error
+ * Introduced in VFS API v2 */
+typedef int64_t (RETRO_CALLCONV *retro_vfs_truncate_t)(struct retro_vfs_file_handle *stream, int64_t length);
+
+/* Get the current read / write position for the file. Returns -1 for error.
+ * Introduced in VFS API v1 */
+typedef int64_t (RETRO_CALLCONV *retro_vfs_tell_t)(struct retro_vfs_file_handle *stream);
+
+/* Set the current read/write position for the file. Returns the new position, -1 for error.
+ * Introduced in VFS API v1 */
+typedef int64_t (RETRO_CALLCONV *retro_vfs_seek_t)(struct retro_vfs_file_handle *stream, int64_t offset, int seek_position);
+
+/* Read data from a file. Returns the number of bytes read, or -1 for error.
+ * Introduced in VFS API v1 */
+typedef int64_t (RETRO_CALLCONV *retro_vfs_read_t)(struct retro_vfs_file_handle *stream, void *s, uint64_t len);
+
+/* Write data to a file. Returns the number of bytes written, or -1 for error.
+ * Introduced in VFS API v1 */
+typedef int64_t (RETRO_CALLCONV *retro_vfs_write_t)(struct retro_vfs_file_handle *stream, const void *s, uint64_t len);
+
+/* Flush pending writes to file, if using buffered IO. Returns 0 on sucess, or -1 on failure.
+ * Introduced in VFS API v1 */
+typedef int (RETRO_CALLCONV *retro_vfs_flush_t)(struct retro_vfs_file_handle *stream);
+
+/* Delete the specified file. Returns 0 on success, -1 on failure
+ * Introduced in VFS API v1 */
+typedef int (RETRO_CALLCONV *retro_vfs_remove_t)(const char *path);
+
+/* Rename the specified file. Returns 0 on success, -1 on failure
+ * Introduced in VFS API v1 */
+typedef int (RETRO_CALLCONV *retro_vfs_rename_t)(const char *old_path, const char *new_path);
+
+/* Stat the specified file. Retruns a bitmask of RETRO_VFS_STAT_* flags, none are set if path was not valid.
+ * Additionally stores file size in given variable, unless NULL is given.
+ * Introduced in VFS API v3 */
+typedef int (RETRO_CALLCONV *retro_vfs_stat_t)(const char *path, int32_t *size);
+
+/* Create the specified directory. Returns 0 on success, -1 on unknown failure, -2 if already exists.
+ * Introduced in VFS API v3 */
+typedef int (RETRO_CALLCONV *retro_vfs_mkdir_t)(const char *dir);
+
+/* Open the specified directory for listing. Returns the opaque dir handle, or NULL for error.
+ * Support for the include_hidden argument may vary depending on the platform.
+ * Introduced in VFS API v3 */
+typedef struct retro_vfs_dir_handle *(RETRO_CALLCONV *retro_vfs_opendir_t)(const char *dir, bool include_hidden);
+
+/* Read the directory entry at the current position, and move the read pointer to the next position.
+ * Returns true on success, false if already on the last entry.
+ * Introduced in VFS API v3 */
+typedef bool (RETRO_CALLCONV *retro_vfs_readdir_t)(struct retro_vfs_dir_handle *dirstream);
+
+/* Get the name of the last entry read. Returns a string on success, or NULL for error.
+ * The returned string pointer is valid until the next call to readdir or closedir.
+ * Introduced in VFS API v3 */
+typedef const char *(RETRO_CALLCONV *retro_vfs_dirent_get_name_t)(struct retro_vfs_dir_handle *dirstream);
+
+/* Check if the last entry read was a directory. Returns true if it was, false otherwise (or on error).
+ * Introduced in VFS API v3 */
+typedef bool (RETRO_CALLCONV *retro_vfs_dirent_is_dir_t)(struct retro_vfs_dir_handle *dirstream);
+
+/* Close the directory and release its resources. Must be called if opendir returns non-NULL. Returns 0 on success, -1 on failure.
+ * Whether the call succeeds ot not, the handle passed as parameter becomes invalid and should no longer be used.
+ * Introduced in VFS API v3 */
+typedef int (RETRO_CALLCONV *retro_vfs_closedir_t)(struct retro_vfs_dir_handle *dirstream);
+
+struct retro_vfs_interface
+{
+   /* VFS API v1 */
+	retro_vfs_get_path_t get_path;
+	retro_vfs_open_t open;
+	retro_vfs_close_t close;
+	retro_vfs_size_t size;
+	retro_vfs_tell_t tell;
+	retro_vfs_seek_t seek;
+	retro_vfs_read_t read;
+	retro_vfs_write_t write;
+	retro_vfs_flush_t flush;
+	retro_vfs_remove_t remove;
+	retro_vfs_rename_t rename;
+   /* VFS API v2 */
+   retro_vfs_truncate_t truncate;
+   /* VFS API v3 */
+   retro_vfs_stat_t stat;
+   retro_vfs_mkdir_t mkdir;
+   retro_vfs_opendir_t opendir;
+   retro_vfs_readdir_t readdir;
+   retro_vfs_dirent_get_name_t dirent_get_name;
+   retro_vfs_dirent_is_dir_t dirent_is_dir;
+   retro_vfs_closedir_t closedir;
+};
+
+struct retro_vfs_interface_info
+{
+   /* Set by core: should this be higher than the version the front end supports,
+    * front end will return false in the RETRO_ENVIRONMENT_GET_VFS_INTERFACE call
+    * Introduced in VFS API v1 */
+   uint32_t required_interface_version;
+
+   /* Frontend writes interface pointer here. The frontend also sets the actual
+    * version, must be at least required_interface_version.
+    * Introduced in VFS API v1 */
+   struct retro_vfs_interface *iface;
+};
+
+enum retro_hw_render_interface_type
+{
+	RETRO_HW_RENDER_INTERFACE_VULKAN = 0,
+	RETRO_HW_RENDER_INTERFACE_D3D9   = 1,
+	RETRO_HW_RENDER_INTERFACE_D3D10  = 2,
+	RETRO_HW_RENDER_INTERFACE_D3D11  = 3,
+	RETRO_HW_RENDER_INTERFACE_D3D12  = 4,
+   RETRO_HW_RENDER_INTERFACE_GSKIT_PS2  = 5,
+   RETRO_HW_RENDER_INTERFACE_DUMMY  = INT_MAX
+};
+
+/* Base struct. All retro_hw_render_interface_* types
+ * contain at least these fields. */
+struct retro_hw_render_interface
+{
+   enum retro_hw_render_interface_type interface_type;
+   unsigned interface_version;
+};
+
+typedef void (RETRO_CALLCONV *retro_set_led_state_t)(int led, int state);
+struct retro_led_interface
+{
+    retro_set_led_state_t set_led_state;
+};
+
+/* Retrieves the current state of the MIDI input.
+ * Returns true if it's enabled, false otherwise. */
+typedef bool (RETRO_CALLCONV *retro_midi_input_enabled_t)(void);
+
+/* Retrieves the current state of the MIDI output.
+ * Returns true if it's enabled, false otherwise */
+typedef bool (RETRO_CALLCONV *retro_midi_output_enabled_t)(void);
+
+/* Reads next byte from the input stream.
+ * Returns true if byte is read, false otherwise. */
+typedef bool (RETRO_CALLCONV *retro_midi_read_t)(uint8_t *byte);
+
+/* Writes byte to the output stream.
+ * 'delta_time' is in microseconds and represent time elapsed since previous write.
+ * Returns true if byte is written, false otherwise. */
+typedef bool (RETRO_CALLCONV *retro_midi_write_t)(uint8_t byte, uint32_t delta_time);
+
+/* Flushes previously written data.
+ * Returns true if successful, false otherwise. */
+typedef bool (RETRO_CALLCONV *retro_midi_flush_t)(void);
+
+struct retro_midi_interface
+{
+   retro_midi_input_enabled_t input_enabled;
+   retro_midi_output_enabled_t output_enabled;
+   retro_midi_read_t read;
+   retro_midi_write_t write;
+   retro_midi_flush_t flush;
+};
+
+enum retro_hw_render_context_negotiation_interface_type
+{
+   RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_VULKAN = 0,
+   RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_DUMMY = INT_MAX
+};
+
+/* Base struct. All retro_hw_render_context_negotiation_interface_* types
+ * contain at least these fields. */
+struct retro_hw_render_context_negotiation_interface
+{
+   enum retro_hw_render_context_negotiation_interface_type interface_type;
+   unsigned interface_version;
+};
+
+/* Serialized state is incomplete in some way. Set if serialization is
+ * usable in typical end-user cases but should not be relied upon to
+ * implement frame-sensitive frontend features such as netplay or
+ * rerecording. */
+#define RETRO_SERIALIZATION_QUIRK_INCOMPLETE (1 << 0)
+/* The core must spend some time initializing before serialization is
+ * supported. retro_serialize() will initially fail; retro_unserialize()
+ * and retro_serialize_size() may or may not work correctly either. */
+#define RETRO_SERIALIZATION_QUIRK_MUST_INITIALIZE (1 << 1)
+/* Serialization size may change within a session. */
+#define RETRO_SERIALIZATION_QUIRK_CORE_VARIABLE_SIZE (1 << 2)
+/* Set by the frontend to acknowledge that it supports variable-sized
+ * states. */
+#define RETRO_SERIALIZATION_QUIRK_FRONT_VARIABLE_SIZE (1 << 3)
+/* Serialized state can only be loaded during the same session. */
+#define RETRO_SERIALIZATION_QUIRK_SINGLE_SESSION (1 << 4)
+/* Serialized state cannot be loaded on an architecture with a different
+ * endianness from the one it was saved on. */
+#define RETRO_SERIALIZATION_QUIRK_ENDIAN_DEPENDENT (1 << 5)
+/* Serialized state cannot be loaded on a different platform from the one it
+ * was saved on for reasons other than endianness, such as word size
+ * dependence */
+#define RETRO_SERIALIZATION_QUIRK_PLATFORM_DEPENDENT (1 << 6)
+
+#define RETRO_MEMDESC_CONST      (1 << 0)   /* The frontend will never change this memory area once retro_load_game has returned. */
+#define RETRO_MEMDESC_BIGENDIAN  (1 << 1)   /* The memory area contains big endian data. Default is little endian. */
+#define RETRO_MEMDESC_SYSTEM_RAM (1 << 2)   /* The memory area is system RAM.  This is main RAM of the gaming system. */
+#define RETRO_MEMDESC_SAVE_RAM   (1 << 3)   /* The memory area is save RAM. This RAM is usually found on a game cartridge, backed up by a battery. */
+#define RETRO_MEMDESC_VIDEO_RAM  (1 << 4)   /* The memory area is video RAM (VRAM) */
+#define RETRO_MEMDESC_ALIGN_2    (1 << 16)  /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */
+#define RETRO_MEMDESC_ALIGN_4    (2 << 16)
+#define RETRO_MEMDESC_ALIGN_8    (3 << 16)
+#define RETRO_MEMDESC_MINSIZE_2  (1 << 24)  /* All memory in this region is accessed at least 2 bytes at the time. */
+#define RETRO_MEMDESC_MINSIZE_4  (2 << 24)
+#define RETRO_MEMDESC_MINSIZE_8  (3 << 24)
+struct retro_memory_descriptor
+{
+   uint64_t flags;
+
+   /* Pointer to the start of the relevant ROM or RAM chip.
+    * It's strongly recommended to use 'offset' if possible, rather than
+    * doing math on the pointer.
+    *
+    * If the same byte is mapped my multiple descriptors, their descriptors
+    * must have the same pointer.
+    * If 'start' does not point to the first byte in the pointer, put the
+    * difference in 'offset' instead.
+    *
+    * May be NULL if there's nothing usable here (e.g. hardware registers and
+    * open bus). No flags should be set if the pointer is NULL.
+    * It's recommended to minimize the number of descriptors if possible,
+    * but not mandatory. */
+   void *ptr;
+   size_t offset;
+
+   /* This is the location in the emulated address space
+    * where the mapping starts. */
+   size_t start;
+
+   /* Which bits must be same as in 'start' for this mapping to apply.
+    * The first memory descriptor to claim a certain byte is the one
+    * that applies.
+    * A bit which is set in 'start' must also be set in this.
+    * Can be zero, in which case each byte is assumed mapped exactly once.
+    * In this case, 'len' must be a power of two. */
+   size_t select;
+
+   /* If this is nonzero, the set bits are assumed not connected to the
+    * memory chip's address pins. */
+   size_t disconnect;
+
+   /* This one tells the size of the current memory area.
+    * If, after start+disconnect are applied, the address is higher than
+    * this, the highest bit of the address is cleared.
+    *
+    * If the address is still too high, the next highest bit is cleared.
+    * Can be zero, in which case it's assumed to be infinite (as limited
+    * by 'select' and 'disconnect'). */
+   size_t len;
+
+   /* To go from emulated address to physical address, the following
+    * order applies:
+    * Subtract 'start', pick off 'disconnect', apply 'len', add 'offset'. */
+
+   /* The address space name must consist of only a-zA-Z0-9_-,
+    * should be as short as feasible (maximum length is 8 plus the NUL),
+    * and may not be any other address space plus one or more 0-9A-F
+    * at the end.
+    * However, multiple memory descriptors for the same address space is
+    * allowed, and the address space name can be empty. NULL is treated
+    * as empty.
+    *
+    * Address space names are case sensitive, but avoid lowercase if possible.
+    * The same pointer may exist in multiple address spaces.
+    *
+    * Examples:
+    * blank+blank - valid (multiple things may be mapped in the same namespace)
+    * 'Sp'+'Sp' - valid (multiple things may be mapped in the same namespace)
+    * 'A'+'B' - valid (neither is a prefix of each other)
+    * 'S'+blank - valid ('S' is not in 0-9A-F)
+    * 'a'+blank - valid ('a' is not in 0-9A-F)
+    * 'a'+'A' - valid (neither is a prefix of each other)
+    * 'AR'+blank - valid ('R' is not in 0-9A-F)
+    * 'ARB'+blank - valid (the B can't be part of the address either, because
+    *                      there is no namespace 'AR')
+    * blank+'B' - not valid, because it's ambigous which address space B1234
+    *             would refer to.
+    * The length can't be used for that purpose; the frontend may want
+    * to append arbitrary data to an address, without a separator. */
+   const char *addrspace;
+
+   /* TODO: When finalizing this one, add a description field, which should be
+    * "WRAM" or something roughly equally long. */
+
+   /* TODO: When finalizing this one, replace 'select' with 'limit', which tells
+    * which bits can vary and still refer to the same address (limit = ~select).
+    * TODO: limit? range? vary? something else? */
+
+   /* TODO: When finalizing this one, if 'len' is above what 'select' (or
+    * 'limit') allows, it's bankswitched. Bankswitched data must have both 'len'
+    * and 'select' != 0, and the mappings don't tell how the system switches the
+    * banks. */
+
+   /* TODO: When finalizing this one, fix the 'len' bit removal order.
+    * For len=0x1800, pointer 0x1C00 should go to 0x1400, not 0x0C00.
+    * Algorithm: Take bits highest to lowest, but if it goes above len, clear
+    * the most recent addition and continue on the next bit.
+    * TODO: Can the above be optimized? Is "remove the lowest bit set in both
+    * pointer and 'len'" equivalent? */
+
+   /* TODO: Some emulators (MAME?) emulate big endian systems by only accessing
+    * the emulated memory in 32-bit chunks, native endian. But that's nothing
+    * compared to Darek Mihocka <http://www.emulators.com/docs/nx07_vm101.htm>
+    * (section Emulation 103 - Nearly Free Byte Reversal) - he flips the ENTIRE
+    * RAM backwards! I'll want to represent both of those, via some flags.
+    *
+    * I suspect MAME either didn't think of that idea, or don't want the #ifdef.
+    * Not sure which, nor do I really care. */
+
+   /* TODO: Some of those flags are unused and/or don't really make sense. Clean
+    * them up. */
+};
+
+/* The frontend may use the largest value of 'start'+'select' in a
+ * certain namespace to infer the size of the address space.
+ *
+ * If the address space is larger than that, a mapping with .ptr=NULL
+ * should be at the end of the array, with .select set to all ones for
+ * as long as the address space is big.
+ *
+ * Sample descriptors (minus .ptr, and RETRO_MEMFLAG_ on the flags):
+ * SNES WRAM:
+ * .start=0x7E0000, .len=0x20000
+ * (Note that this must be mapped before the ROM in most cases; some of the
+ * ROM mappers
+ * try to claim $7E0000, or at least $7E8000.)
+ * SNES SPC700 RAM:
+ * .addrspace="S", .len=0x10000
+ * SNES WRAM mirrors:
+ * .flags=MIRROR, .start=0x000000, .select=0xC0E000, .len=0x2000
+ * .flags=MIRROR, .start=0x800000, .select=0xC0E000, .len=0x2000
+ * SNES WRAM mirrors, alternate equivalent descriptor:
+ * .flags=MIRROR, .select=0x40E000, .disconnect=~0x1FFF
+ * (Various similar constructions can be created by combining parts of
+ * the above two.)
+ * SNES LoROM (512KB, mirrored a couple of times):
+ * .flags=CONST, .start=0x008000, .select=0x408000, .disconnect=0x8000, .len=512*1024
+ * .flags=CONST, .start=0x400000, .select=0x400000, .disconnect=0x8000, .len=512*1024
+ * SNES HiROM (4MB):
+ * .flags=CONST,                 .start=0x400000, .select=0x400000, .len=4*1024*1024
+ * .flags=CONST, .offset=0x8000, .start=0x008000, .select=0x408000, .len=4*1024*1024
+ * SNES ExHiROM (8MB):
+ * .flags=CONST, .offset=0,                  .start=0xC00000, .select=0xC00000, .len=4*1024*1024
+ * .flags=CONST, .offset=4*1024*1024,        .start=0x400000, .select=0xC00000, .len=4*1024*1024
+ * .flags=CONST, .offset=0x8000,             .start=0x808000, .select=0xC08000, .len=4*1024*1024
+ * .flags=CONST, .offset=4*1024*1024+0x8000, .start=0x008000, .select=0xC08000, .len=4*1024*1024
+ * Clarify the size of the address space:
+ * .ptr=NULL, .select=0xFFFFFF
+ * .len can be implied by .select in many of them, but was included for clarity.
+ */
+
+struct retro_memory_map
+{
+   const struct retro_memory_descriptor *descriptors;
+   unsigned num_descriptors;
+};
+
+struct retro_controller_description
+{
+   /* Human-readable description of the controller. Even if using a generic
+    * input device type, this can be set to the particular device type the
+    * core uses. */
+   const char *desc;
+
+   /* Device type passed to retro_set_controller_port_device(). If the device
+    * type is a sub-class of a generic input device type, use the
+    * RETRO_DEVICE_SUBCLASS macro to create an ID.
+    *
+    * E.g. RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1). */
+   unsigned id;
+};
+
+struct retro_controller_info
+{
+   const struct retro_controller_description *types;
+   unsigned num_types;
+};
+
+struct retro_subsystem_memory_info
+{
+   /* The extension associated with a memory type, e.g. "psram". */
+   const char *extension;
+
+   /* The memory type for retro_get_memory(). This should be at
+    * least 0x100 to avoid conflict with standardized
+    * libretro memory types. */
+   unsigned type;
+};
+
+struct retro_subsystem_rom_info
+{
+   /* Describes what the content is (SGB BIOS, GB ROM, etc). */
+   const char *desc;
+
+   /* Same definition as retro_get_system_info(). */
+   const char *valid_extensions;
+
+   /* Same definition as retro_get_system_info(). */
+   bool need_fullpath;
+
+   /* Same definition as retro_get_system_info(). */
+   bool block_extract;
+
+   /* This is set if the content is required to load a game.
+    * If this is set to false, a zeroed-out retro_game_info can be passed. */
+   bool required;
+
+   /* Content can have multiple associated persistent
+    * memory types (retro_get_memory()). */
+   const struct retro_subsystem_memory_info *memory;
+   unsigned num_memory;
+};
+
+struct retro_subsystem_info
+{
+   /* Human-readable string of the subsystem type, e.g. "Super GameBoy" */
+   const char *desc;
+
+   /* A computer friendly short string identifier for the subsystem type.
+    * This name must be [a-z].
+    * E.g. if desc is "Super GameBoy", this can be "sgb".
+    * This identifier can be used for command-line interfaces, etc.
+    */
+   const char *ident;
+
+   /* Infos for each content file. The first entry is assumed to be the
+    * "most significant" content for frontend purposes.
+    * E.g. with Super GameBoy, the first content should be the GameBoy ROM,
+    * as it is the most "significant" content to a user.
+    * If a frontend creates new file paths based on the content used
+    * (e.g. savestates), it should use the path for the first ROM to do so. */
+   const struct retro_subsystem_rom_info *roms;
+
+   /* Number of content files associated with a subsystem. */
+   unsigned num_roms;
+
+   /* The type passed to retro_load_game_special(). */
+   unsigned id;
+};
+
+typedef void (RETRO_CALLCONV *retro_proc_address_t)(void);
+
+/* libretro API extension functions:
+ * (None here so far).
+ *
+ * Get a symbol from a libretro core.
+ * Cores should only return symbols which are actual
+ * extensions to the libretro API.
+ *
+ * Frontends should not use this to obtain symbols to standard
+ * libretro entry points (static linking or dlsym).
+ *
+ * The symbol name must be equal to the function name,
+ * e.g. if void retro_foo(void); exists, the symbol must be called "retro_foo".
+ * The returned function pointer must be cast to the corresponding type.
+ */
+typedef retro_proc_address_t (RETRO_CALLCONV *retro_get_proc_address_t)(const char *sym);
+
+struct retro_get_proc_address_interface
+{
+   retro_get_proc_address_t get_proc_address;
+};
+
+enum retro_log_level
+{
+   RETRO_LOG_DEBUG = 0,
+   RETRO_LOG_INFO,
+   RETRO_LOG_WARN,
+   RETRO_LOG_ERROR,
+
+   RETRO_LOG_DUMMY = INT_MAX
+};
+
+/* Logging function. Takes log level argument as well. */
+typedef void (RETRO_CALLCONV *retro_log_printf_t)(enum retro_log_level level,
+      const char *fmt, ...);
+
+struct retro_log_callback
+{
+   retro_log_printf_t log;
+};
+
+/* Performance related functions */
+
+/* ID values for SIMD CPU features */
+#define RETRO_SIMD_SSE      (1 << 0)
+#define RETRO_SIMD_SSE2     (1 << 1)
+#define RETRO_SIMD_VMX      (1 << 2)
+#define RETRO_SIMD_VMX128   (1 << 3)
+#define RETRO_SIMD_AVX      (1 << 4)
+#define RETRO_SIMD_NEON     (1 << 5)
+#define RETRO_SIMD_SSE3     (1 << 6)
+#define RETRO_SIMD_SSSE3    (1 << 7)
+#define RETRO_SIMD_MMX      (1 << 8)
+#define RETRO_SIMD_MMXEXT   (1 << 9)
+#define RETRO_SIMD_SSE4     (1 << 10)
+#define RETRO_SIMD_SSE42    (1 << 11)
+#define RETRO_SIMD_AVX2     (1 << 12)
+#define RETRO_SIMD_VFPU     (1 << 13)
+#define RETRO_SIMD_PS       (1 << 14)
+#define RETRO_SIMD_AES      (1 << 15)
+#define RETRO_SIMD_VFPV3    (1 << 16)
+#define RETRO_SIMD_VFPV4    (1 << 17)
+#define RETRO_SIMD_POPCNT   (1 << 18)
+#define RETRO_SIMD_MOVBE    (1 << 19)
+#define RETRO_SIMD_CMOV     (1 << 20)
+#define RETRO_SIMD_ASIMD    (1 << 21)
+
+typedef uint64_t retro_perf_tick_t;
+typedef int64_t retro_time_t;
+
+struct retro_perf_counter
+{
+   const char *ident;
+   retro_perf_tick_t start;
+   retro_perf_tick_t total;
+   retro_perf_tick_t call_cnt;
+
+   bool registered;
+};
+
+/* Returns current time in microseconds.
+ * Tries to use the most accurate timer available.
+ */
+typedef retro_time_t (RETRO_CALLCONV *retro_perf_get_time_usec_t)(void);
+
+/* A simple counter. Usually nanoseconds, but can also be CPU cycles.
+ * Can be used directly if desired (when creating a more sophisticated
+ * performance counter system).
+ * */
+typedef retro_perf_tick_t (RETRO_CALLCONV *retro_perf_get_counter_t)(void);
+
+/* Returns a bit-mask of detected CPU features (RETRO_SIMD_*). */
+typedef uint64_t (RETRO_CALLCONV *retro_get_cpu_features_t)(void);
+
+/* Asks frontend to log and/or display the state of performance counters.
+ * Performance counters can always be poked into manually as well.
+ */
+typedef void (RETRO_CALLCONV *retro_perf_log_t)(void);
+
+/* Register a performance counter.
+ * ident field must be set with a discrete value and other values in
+ * retro_perf_counter must be 0.
+ * Registering can be called multiple times. To avoid calling to
+ * frontend redundantly, you can check registered field first. */
+typedef void (RETRO_CALLCONV *retro_perf_register_t)(struct retro_perf_counter *counter);
+
+/* Starts a registered counter. */
+typedef void (RETRO_CALLCONV *retro_perf_start_t)(struct retro_perf_counter *counter);
+
+/* Stops a registered counter. */
+typedef void (RETRO_CALLCONV *retro_perf_stop_t)(struct retro_perf_counter *counter);
+
+/* For convenience it can be useful to wrap register, start and stop in macros.
+ * E.g.:
+ * #ifdef LOG_PERFORMANCE
+ * #define RETRO_PERFORMANCE_INIT(perf_cb, name) static struct retro_perf_counter name = {#name}; if (!name.registered) perf_cb.perf_register(&(name))
+ * #define RETRO_PERFORMANCE_START(perf_cb, name) perf_cb.perf_start(&(name))
+ * #define RETRO_PERFORMANCE_STOP(perf_cb, name) perf_cb.perf_stop(&(name))
+ * #else
+ * ... Blank macros ...
+ * #endif
+ *
+ * These can then be used mid-functions around code snippets.
+ *
+ * extern struct retro_perf_callback perf_cb;  * Somewhere in the core.
+ *
+ * void do_some_heavy_work(void)
+ * {
+ *    RETRO_PERFORMANCE_INIT(cb, work_1;
+ *    RETRO_PERFORMANCE_START(cb, work_1);
+ *    heavy_work_1();
+ *    RETRO_PERFORMANCE_STOP(cb, work_1);
+ *
+ *    RETRO_PERFORMANCE_INIT(cb, work_2);
+ *    RETRO_PERFORMANCE_START(cb, work_2);
+ *    heavy_work_2();
+ *    RETRO_PERFORMANCE_STOP(cb, work_2);
+ * }
+ *
+ * void retro_deinit(void)
+ * {
+ *    perf_cb.perf_log();  * Log all perf counters here for example.
+ * }
+ */
+
+struct retro_perf_callback
+{
+   retro_perf_get_time_usec_t    get_time_usec;
+   retro_get_cpu_features_t      get_cpu_features;
+
+   retro_perf_get_counter_t      get_perf_counter;
+   retro_perf_register_t         perf_register;
+   retro_perf_start_t            perf_start;
+   retro_perf_stop_t             perf_stop;
+   retro_perf_log_t              perf_log;
+};
+
+/* FIXME: Document the sensor API and work out behavior.
+ * It will be marked as experimental until then.
+ */
+enum retro_sensor_action
+{
+   RETRO_SENSOR_ACCELEROMETER_ENABLE = 0,
+   RETRO_SENSOR_ACCELEROMETER_DISABLE,
+   RETRO_SENSOR_GYROSCOPE_ENABLE,
+   RETRO_SENSOR_GYROSCOPE_DISABLE,
+   RETRO_SENSOR_ILLUMINANCE_ENABLE,
+   RETRO_SENSOR_ILLUMINANCE_DISABLE,
+
+   RETRO_SENSOR_DUMMY = INT_MAX
+};
+
+/* Id values for SENSOR types. */
+#define RETRO_SENSOR_ACCELEROMETER_X 0
+#define RETRO_SENSOR_ACCELEROMETER_Y 1
+#define RETRO_SENSOR_ACCELEROMETER_Z 2
+#define RETRO_SENSOR_GYROSCOPE_X 3
+#define RETRO_SENSOR_GYROSCOPE_Y 4
+#define RETRO_SENSOR_GYROSCOPE_Z 5
+#define RETRO_SENSOR_ILLUMINANCE 6
+
+typedef bool (RETRO_CALLCONV *retro_set_sensor_state_t)(unsigned port,
+      enum retro_sensor_action action, unsigned rate);
+
+typedef float (RETRO_CALLCONV *retro_sensor_get_input_t)(unsigned port, unsigned id);
+
+struct retro_sensor_interface
+{
+   retro_set_sensor_state_t set_sensor_state;
+   retro_sensor_get_input_t get_sensor_input;
+};
+
+enum retro_camera_buffer
+{
+   RETRO_CAMERA_BUFFER_OPENGL_TEXTURE = 0,
+   RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER,
+
+   RETRO_CAMERA_BUFFER_DUMMY = INT_MAX
+};
+
+/* Starts the camera driver. Can only be called in retro_run(). */
+typedef bool (RETRO_CALLCONV *retro_camera_start_t)(void);
+
+/* Stops the camera driver. Can only be called in retro_run(). */
+typedef void (RETRO_CALLCONV *retro_camera_stop_t)(void);
+
+/* Callback which signals when the camera driver is initialized
+ * and/or deinitialized.
+ * retro_camera_start_t can be called in initialized callback.
+ */
+typedef void (RETRO_CALLCONV *retro_camera_lifetime_status_t)(void);
+
+/* A callback for raw framebuffer data. buffer points to an XRGB8888 buffer.
+ * Width, height and pitch are similar to retro_video_refresh_t.
+ * First pixel is top-left origin.
+ */
+typedef void (RETRO_CALLCONV *retro_camera_frame_raw_framebuffer_t)(const uint32_t *buffer,
+      unsigned width, unsigned height, size_t pitch);
+
+/* A callback for when OpenGL textures are used.
+ *
+ * texture_id is a texture owned by camera driver.
+ * Its state or content should be considered immutable, except for things like
+ * texture filtering and clamping.
+ *
+ * texture_target is the texture target for the GL texture.
+ * These can include e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE, and possibly
+ * more depending on extensions.
+ *
+ * affine points to a packed 3x3 column-major matrix used to apply an affine
+ * transform to texture coordinates. (affine_matrix * vec3(coord_x, coord_y, 1.0))
+ * After transform, normalized texture coord (0, 0) should be bottom-left
+ * and (1, 1) should be top-right (or (width, height) for RECTANGLE).
+ *
+ * GL-specific typedefs are avoided here to avoid relying on gl.h in
+ * the API definition.
+ */
+typedef void (RETRO_CALLCONV *retro_camera_frame_opengl_texture_t)(unsigned texture_id,
+      unsigned texture_target, const float *affine);
+
+struct retro_camera_callback
+{
+   /* Set by libretro core.
+    * Example bitmask: caps = (1 << RETRO_CAMERA_BUFFER_OPENGL_TEXTURE) | (1 << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER).
+    */
+   uint64_t caps;
+
+   /* Desired resolution for camera. Is only used as a hint. */
+   unsigned width;
+   unsigned height;
+
+   /* Set by frontend. */
+   retro_camera_start_t start;
+   retro_camera_stop_t stop;
+
+   /* Set by libretro core if raw framebuffer callbacks will be used. */
+   retro_camera_frame_raw_framebuffer_t frame_raw_framebuffer;
+
+   /* Set by libretro core if OpenGL texture callbacks will be used. */
+   retro_camera_frame_opengl_texture_t frame_opengl_texture;
+
+   /* Set by libretro core. Called after camera driver is initialized and
+    * ready to be started.
+    * Can be NULL, in which this callback is not called.
+    */
+   retro_camera_lifetime_status_t initialized;
+
+   /* Set by libretro core. Called right before camera driver is
+    * deinitialized.
+    * Can be NULL, in which this callback is not called.
+    */
+   retro_camera_lifetime_status_t deinitialized;
+};
+
+/* Sets the interval of time and/or distance at which to update/poll
+ * location-based data.
+ *
+ * To ensure compatibility with all location-based implementations,
+ * values for both interval_ms and interval_distance should be provided.
+ *
+ * interval_ms is the interval expressed in milliseconds.
+ * interval_distance is the distance interval expressed in meters.
+ */
+typedef void (RETRO_CALLCONV *retro_location_set_interval_t)(unsigned interval_ms,
+      unsigned interval_distance);
+
+/* Start location services. The device will start listening for changes to the
+ * current location at regular intervals (which are defined with
+ * retro_location_set_interval_t). */
+typedef bool (RETRO_CALLCONV *retro_location_start_t)(void);
+
+/* Stop location services. The device will stop listening for changes
+ * to the current location. */
+typedef void (RETRO_CALLCONV *retro_location_stop_t)(void);
+
+/* Get the position of the current location. Will set parameters to
+ * 0 if no new  location update has happened since the last time. */
+typedef bool (RETRO_CALLCONV *retro_location_get_position_t)(double *lat, double *lon,
+      double *horiz_accuracy, double *vert_accuracy);
+
+/* Callback which signals when the location driver is initialized
+ * and/or deinitialized.
+ * retro_location_start_t can be called in initialized callback.
+ */
+typedef void (RETRO_CALLCONV *retro_location_lifetime_status_t)(void);
+
+struct retro_location_callback
+{
+   retro_location_start_t         start;
+   retro_location_stop_t          stop;
+   retro_location_get_position_t  get_position;
+   retro_location_set_interval_t  set_interval;
+
+   retro_location_lifetime_status_t initialized;
+   retro_location_lifetime_status_t deinitialized;
+};
+
+enum retro_rumble_effect
+{
+   RETRO_RUMBLE_STRONG = 0,
+   RETRO_RUMBLE_WEAK = 1,
+
+   RETRO_RUMBLE_DUMMY = INT_MAX
+};
+
+/* Sets rumble state for joypad plugged in port 'port'.
+ * Rumble effects are controlled independently,
+ * and setting e.g. strong rumble does not override weak rumble.
+ * Strength has a range of [0, 0xffff].
+ *
+ * Returns true if rumble state request was honored.
+ * Calling this before first retro_run() is likely to return false. */
+typedef bool (RETRO_CALLCONV *retro_set_rumble_state_t)(unsigned port,
+      enum retro_rumble_effect effect, uint16_t strength);
+
+struct retro_rumble_interface
+{
+   retro_set_rumble_state_t set_rumble_state;
+};
+
+/* Notifies libretro that audio data should be written. */
+typedef void (RETRO_CALLCONV *retro_audio_callback_t)(void);
+
+/* True: Audio driver in frontend is active, and callback is
+ * expected to be called regularily.
+ * False: Audio driver in frontend is paused or inactive.
+ * Audio callback will not be called until set_state has been
+ * called with true.
+ * Initial state is false (inactive).
+ */
+typedef void (RETRO_CALLCONV *retro_audio_set_state_callback_t)(bool enabled);
+
+struct retro_audio_callback
+{
+   retro_audio_callback_t callback;
+   retro_audio_set_state_callback_t set_state;
+};
+
+/* Notifies a libretro core of time spent since last invocation
+ * of retro_run() in microseconds.
+ *
+ * It will be called right before retro_run() every frame.
+ * The frontend can tamper with timing to support cases like
+ * fast-forward, slow-motion and framestepping.
+ *
+ * In those scenarios the reference frame time value will be used. */
+typedef int64_t retro_usec_t;
+typedef void (RETRO_CALLCONV *retro_frame_time_callback_t)(retro_usec_t usec);
+struct retro_frame_time_callback
+{
+   retro_frame_time_callback_t callback;
+   /* Represents the time of one frame. It is computed as
+    * 1000000 / fps, but the implementation will resolve the
+    * rounding to ensure that framestepping, etc is exact. */
+   retro_usec_t reference;
+};
+
+/* Notifies a libretro core of the current occupancy
+ * level of the frontend audio buffer.
+ *
+ * - active: 'true' if audio buffer is currently
+ *           in use. Will be 'false' if audio is
+ *           disabled in the frontend
+ *
+ * - occupancy: Given as a value in the range [0,100],
+ *              corresponding to the occupancy percentage
+ *              of the audio buffer
+ *
+ * - underrun_likely: 'true' if the frontend expects an
+ *                    audio buffer underrun during the
+ *                    next frame (indicates that a core
+ *                    should attempt frame skipping)
+ *
+ * It will be called right before retro_run() every frame. */
+typedef void (RETRO_CALLCONV *retro_audio_buffer_status_callback_t)(
+      bool active, unsigned occupancy, bool underrun_likely);
+struct retro_audio_buffer_status_callback
+{
+   retro_audio_buffer_status_callback_t callback;
+};
+
+/* Pass this to retro_video_refresh_t if rendering to hardware.
+ * Passing NULL to retro_video_refresh_t is still a frame dupe as normal.
+ * */
+#define RETRO_HW_FRAME_BUFFER_VALID ((void*)-1)
+
+/* Invalidates the current HW context.
+ * Any GL state is lost, and must not be deinitialized explicitly.
+ * If explicit deinitialization is desired by the libretro core,
+ * it should implement context_destroy callback.
+ * If called, all GPU resources must be reinitialized.
+ * Usually called when frontend reinits video driver.
+ * Also called first time video driver is initialized,
+ * allowing libretro core to initialize resources.
+ */
+typedef void (RETRO_CALLCONV *retro_hw_context_reset_t)(void);
+
+/* Gets current framebuffer which is to be rendered to.
+ * Could change every frame potentially.
+ */
+typedef uintptr_t (RETRO_CALLCONV *retro_hw_get_current_framebuffer_t)(void);
+
+/* Get a symbol from HW context. */
+typedef retro_proc_address_t (RETRO_CALLCONV *retro_hw_get_proc_address_t)(const char *sym);
+
+enum retro_hw_context_type
+{
+   RETRO_HW_CONTEXT_NONE             = 0,
+   /* OpenGL 2.x. Driver can choose to use latest compatibility context. */
+   RETRO_HW_CONTEXT_OPENGL           = 1,
+   /* OpenGL ES 2.0. */
+   RETRO_HW_CONTEXT_OPENGLES2        = 2,
+   /* Modern desktop core GL context. Use version_major/
+    * version_minor fields to set GL version. */
+   RETRO_HW_CONTEXT_OPENGL_CORE      = 3,
+   /* OpenGL ES 3.0 */
+   RETRO_HW_CONTEXT_OPENGLES3        = 4,
+   /* OpenGL ES 3.1+. Set version_major/version_minor. For GLES2 and GLES3,
+    * use the corresponding enums directly. */
+   RETRO_HW_CONTEXT_OPENGLES_VERSION = 5,
+
+   /* Vulkan, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE. */
+   RETRO_HW_CONTEXT_VULKAN           = 6,
+
+   /* Direct3D, set version_major to select the type of interface
+    * returned by RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE */
+   RETRO_HW_CONTEXT_DIRECT3D         = 7,
+
+   RETRO_HW_CONTEXT_DUMMY = INT_MAX
+};
+
+struct retro_hw_render_callback
+{
+   /* Which API to use. Set by libretro core. */
+   enum retro_hw_context_type context_type;
+
+   /* Called when a context has been created or when it has been reset.
+    * An OpenGL context is only valid after context_reset() has been called.
+    *
+    * When context_reset is called, OpenGL resources in the libretro
+    * implementation are guaranteed to be invalid.
+    *
+    * It is possible that context_reset is called multiple times during an
+    * application lifecycle.
+    * If context_reset is called without any notification (context_destroy),
+    * the OpenGL context was lost and resources should just be recreated
+    * without any attempt to "free" old resources.
+    */
+   retro_hw_context_reset_t context_reset;
+
+   /* Set by frontend.
+    * TODO: This is rather obsolete. The frontend should not
+    * be providing preallocated framebuffers. */
+   retro_hw_get_current_framebuffer_t get_current_framebuffer;
+
+   /* Set by frontend.
+    * Can return all relevant functions, including glClear on Windows. */
+   retro_hw_get_proc_address_t get_proc_address;
+
+   /* Set if render buffers should have depth component attached.
+    * TODO: Obsolete. */
+   bool depth;
+
+   /* Set if stencil buffers should be attached.
+    * TODO: Obsolete. */
+   bool stencil;
+
+   /* If depth and stencil are true, a packed 24/8 buffer will be added.
+    * Only attaching stencil is invalid and will be ignored. */
+
+   /* Use conventional bottom-left origin convention. If false,
+    * standard libretro top-left origin semantics are used.
+    * TODO: Move to GL specific interface. */
+   bool bottom_left_origin;
+
+   /* Major version number for core GL context or GLES 3.1+. */
+   unsigned version_major;
+
+   /* Minor version number for core GL context or GLES 3.1+. */
+   unsigned version_minor;
+
+   /* If this is true, the frontend will go very far to avoid
+    * resetting context in scenarios like toggling fullscreen, etc.
+    * TODO: Obsolete? Maybe frontend should just always assume this ...
+    */
+   bool cache_context;
+
+   /* The reset callback might still be called in extreme situations
+    * such as if the context is lost beyond recovery.
+    *
+    * For optimal stability, set this to false, and allow context to be
+    * reset at any time.
+    */
+
+   /* A callback to be called before the context is destroyed in a
+    * controlled way by the frontend. */
+   retro_hw_context_reset_t context_destroy;
+
+   /* OpenGL resources can be deinitialized cleanly at this step.
+    * context_destroy can be set to NULL, in which resources will
+    * just be destroyed without any notification.
+    *
+    * Even when context_destroy is non-NULL, it is possible that
+    * context_reset is called without any destroy notification.
+    * This happens if context is lost by external factors (such as
+    * notified by GL_ARB_robustness).
+    *
+    * In this case, the context is assumed to be already dead,
+    * and the libretro implementation must not try to free any OpenGL
+    * resources in the subsequent context_reset.
+    */
+
+   /* Creates a debug context. */
+   bool debug_context;
+};
+
+/* Callback type passed in RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK.
+ * Called by the frontend in response to keyboard events.
+ * down is set if the key is being pressed, or false if it is being released.
+ * keycode is the RETROK value of the char.
+ * character is the text character of the pressed key. (UTF-32).
+ * key_modifiers is a set of RETROKMOD values or'ed together.
+ *
+ * The pressed/keycode state can be indepedent of the character.
+ * It is also possible that multiple characters are generated from a
+ * single keypress.
+ * Keycode events should be treated separately from character events.
+ * However, when possible, the frontend should try to synchronize these.
+ * If only a character is posted, keycode should be RETROK_UNKNOWN.
+ *
+ * Similarily if only a keycode event is generated with no corresponding
+ * character, character should be 0.
+ */
+typedef void (RETRO_CALLCONV *retro_keyboard_event_t)(bool down, unsigned keycode,
+      uint32_t character, uint16_t key_modifiers);
+
+struct retro_keyboard_callback
+{
+   retro_keyboard_event_t callback;
+};
+
+/* Callbacks for RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE &
+ * RETRO_ENVIRONMENT_SET_DISK_CONTROL_EXT_INTERFACE.
+ * Should be set for implementations which can swap out multiple disk
+ * images in runtime.
+ *
+ * If the implementation can do this automatically, it should strive to do so.
+ * However, there are cases where the user must manually do so.
+ *
+ * Overview: To swap a disk image, eject the disk image with
+ * set_eject_state(true).
+ * Set the disk index with set_image_index(index). Insert the disk again
+ * with set_eject_state(false).
+ */
+
+/* If ejected is true, "ejects" the virtual disk tray.
+ * When ejected, the disk image index can be set.
+ */
+typedef bool (RETRO_CALLCONV *retro_set_eject_state_t)(bool ejected);
+
+/* Gets current eject state. The initial state is 'not ejected'. */
+typedef bool (RETRO_CALLCONV *retro_get_eject_state_t)(void);
+
+/* Gets current disk index. First disk is index 0.
+ * If return value is >= get_num_images(), no disk is currently inserted.
+ */
+typedef unsigned (RETRO_CALLCONV *retro_get_image_index_t)(void);
+
+/* Sets image index. Can only be called when disk is ejected.
+ * The implementation supports setting "no disk" by using an
+ * index >= get_num_images().
+ */
+typedef bool (RETRO_CALLCONV *retro_set_image_index_t)(unsigned index);
+
+/* Gets total number of images which are available to use. */
+typedef unsigned (RETRO_CALLCONV *retro_get_num_images_t)(void);
+
+struct retro_game_info;
+
+/* Replaces the disk image associated with index.
+ * Arguments to pass in info have same requirements as retro_load_game().
+ * Virtual disk tray must be ejected when calling this.
+ *
+ * Replacing a disk image with info = NULL will remove the disk image
+ * from the internal list.
+ * As a result, calls to get_image_index() can change.
+ *
+ * E.g. replace_image_index(1, NULL), and previous get_image_index()
+ * returned 4 before.
+ * Index 1 will be removed, and the new index is 3.
+ */
+typedef bool (RETRO_CALLCONV *retro_replace_image_index_t)(unsigned index,
+      const struct retro_game_info *info);
+
+/* Adds a new valid index (get_num_images()) to the internal disk list.
+ * This will increment subsequent return values from get_num_images() by 1.
+ * This image index cannot be used until a disk image has been set
+ * with replace_image_index. */
+typedef bool (RETRO_CALLCONV *retro_add_image_index_t)(void);
+
+/* Sets initial image to insert in drive when calling
+ * core_load_game().
+ * Since we cannot pass the initial index when loading
+ * content (this would require a major API change), this
+ * is set by the frontend *before* calling the core's
+ * retro_load_game()/retro_load_game_special() implementation.
+ * A core should therefore cache the index/path values and handle
+ * them inside retro_load_game()/retro_load_game_special().
+ * - If 'index' is invalid (index >= get_num_images()), the
+ *   core should ignore the set value and instead use 0
+ * - 'path' is used purely for error checking - i.e. when
+ *   content is loaded, the core should verify that the
+ *   disk specified by 'index' has the specified file path.
+ *   This is to guard against auto selecting the wrong image
+ *   if (for example) the user should modify an existing M3U
+ *   playlist. We have to let the core handle this because
+ *   set_initial_image() must be called before loading content,
+ *   i.e. the frontend cannot access image paths in advance
+ *   and thus cannot perform the error check itself.
+ *   If set path and content path do not match, the core should
+ *   ignore the set 'index' value and instead use 0
+ * Returns 'false' if index or 'path' are invalid, or core
+ * does not support this functionality
+ */
+typedef bool (RETRO_CALLCONV *retro_set_initial_image_t)(unsigned index, const char *path);
+
+/* Fetches the path of the specified disk image file.
+ * Returns 'false' if index is invalid (index >= get_num_images())
+ * or path is otherwise unavailable.
+ */
+typedef bool (RETRO_CALLCONV *retro_get_image_path_t)(unsigned index, char *path, size_t len);
+
+/* Fetches a core-provided 'label' for the specified disk
+ * image file. In the simplest case this may be a file name
+ * (without extension), but for cores with more complex
+ * content requirements information may be provided to
+ * facilitate user disk swapping - for example, a core
+ * running floppy-disk-based content may uniquely label
+ * save disks, data disks, level disks, etc. with names
+ * corresponding to in-game disk change prompts (so the
+ * frontend can provide better user guidance than a 'dumb'
+ * disk index value).
+ * Returns 'false' if index is invalid (index >= get_num_images())
+ * or label is otherwise unavailable.
+ */
+typedef bool (RETRO_CALLCONV *retro_get_image_label_t)(unsigned index, char *label, size_t len);
+
+struct retro_disk_control_callback
+{
+   retro_set_eject_state_t set_eject_state;
+   retro_get_eject_state_t get_eject_state;
+
+   retro_get_image_index_t get_image_index;
+   retro_set_image_index_t set_image_index;
+   retro_get_num_images_t  get_num_images;
+
+   retro_replace_image_index_t replace_image_index;
+   retro_add_image_index_t add_image_index;
+};
+
+struct retro_disk_control_ext_callback
+{
+   retro_set_eject_state_t set_eject_state;
+   retro_get_eject_state_t get_eject_state;
+
+   retro_get_image_index_t get_image_index;
+   retro_set_image_index_t set_image_index;
+   retro_get_num_images_t  get_num_images;
+
+   retro_replace_image_index_t replace_image_index;
+   retro_add_image_index_t add_image_index;
+
+   /* NOTE: Frontend will only attempt to record/restore
+    * last used disk index if both set_initial_image()
+    * and get_image_path() are implemented */
+   retro_set_initial_image_t set_initial_image; /* Optional - may be NULL */
+
+   retro_get_image_path_t get_image_path;       /* Optional - may be NULL */
+   retro_get_image_label_t get_image_label;     /* Optional - may be NULL */
+};
+
+enum retro_pixel_format
+{
+   /* 0RGB1555, native endian.
+    * 0 bit must be set to 0.
+    * This pixel format is default for compatibility concerns only.
+    * If a 15/16-bit pixel format is desired, consider using RGB565. */
+   RETRO_PIXEL_FORMAT_0RGB1555 = 0,
+
+   /* XRGB8888, native endian.
+    * X bits are ignored. */
+   RETRO_PIXEL_FORMAT_XRGB8888 = 1,
+
+   /* RGB565, native endian.
+    * This pixel format is the recommended format to use if a 15/16-bit
+    * format is desired as it is the pixel format that is typically
+    * available on a wide range of low-power devices.
+    *
+    * It is also natively supported in APIs like OpenGL ES. */
+   RETRO_PIXEL_FORMAT_RGB565   = 2,
+
+   /* Ensure sizeof() == sizeof(int). */
+   RETRO_PIXEL_FORMAT_UNKNOWN  = INT_MAX
+};
+
+struct retro_message
+{
+   const char *msg;        /* Message to be displayed. */
+   unsigned    frames;     /* Duration in frames of message. */
+};
+
+enum retro_message_target
+{
+   RETRO_MESSAGE_TARGET_ALL = 0,
+   RETRO_MESSAGE_TARGET_OSD,
+   RETRO_MESSAGE_TARGET_LOG
+};
+
+enum retro_message_type
+{
+   RETRO_MESSAGE_TYPE_NOTIFICATION = 0,
+   RETRO_MESSAGE_TYPE_NOTIFICATION_ALT,
+   RETRO_MESSAGE_TYPE_STATUS,
+   RETRO_MESSAGE_TYPE_PROGRESS
+};
+
+struct retro_message_ext
+{
+   /* Message string to be displayed/logged */
+   const char *msg;
+   /* Duration (in ms) of message when targeting the OSD */
+   unsigned duration;
+   /* Message priority when targeting the OSD
+    * > When multiple concurrent messages are sent to
+    *   the frontend and the frontend does not have the
+    *   capacity to display them all, messages with the
+    *   *highest* priority value should be shown
+    * > There is no upper limit to a message priority
+    *   value (within the bounds of the unsigned data type)
+    * > In the reference frontend (RetroArch), the same
+    *   priority values are used for frontend-generated
+    *   notifications, which are typically assigned values
+    *   between 0 and 3 depending upon importance */
+   unsigned priority;
+   /* Message logging level (info, warn, error, etc.) */
+   enum retro_log_level level;
+   /* Message destination: OSD, logging interface or both */
+   enum retro_message_target target;
+   /* Message 'type' when targeting the OSD
+    * > RETRO_MESSAGE_TYPE_NOTIFICATION: Specifies that a
+    *   message should be handled in identical fashion to
+    *   a standard frontend-generated notification
+    * > RETRO_MESSAGE_TYPE_NOTIFICATION_ALT: Specifies that
+    *   message is a notification that requires user attention
+    *   or action, but that it should be displayed in a manner
+    *   that differs from standard frontend-generated notifications.
+    *   This would typically correspond to messages that should be
+    *   displayed immediately (independently from any internal
+    *   frontend message queue), and/or which should be visually
+    *   distinguishable from frontend-generated notifications.
+    *   For example, a core may wish to inform the user of
+    *   information related to a disk-change event. It is
+    *   expected that the frontend itself may provide a
+    *   notification in this case; if the core sends a
+    *   message of type RETRO_MESSAGE_TYPE_NOTIFICATION, an
+    *   uncomfortable 'double-notification' may occur. A message
+    *   of RETRO_MESSAGE_TYPE_NOTIFICATION_ALT should therefore
+    *   be presented such that visual conflict with regular
+    *   notifications does not occur
+    * > RETRO_MESSAGE_TYPE_STATUS: Indicates that message
+    *   is not a standard notification. This typically
+    *   corresponds to 'status' indicators, such as a core's
+    *   internal FPS, which are intended to be displayed
+    *   either permanently while a core is running, or in
+    *   a manner that does not suggest user attention or action
+    *   is required. 'Status' type messages should therefore be
+    *   displayed in a different on-screen location and in a manner
+    *   easily distinguishable from both standard frontend-generated
+    *   notifications and messages of type RETRO_MESSAGE_TYPE_NOTIFICATION_ALT
+    * > RETRO_MESSAGE_TYPE_PROGRESS: Indicates that message reports
+    *   the progress of an internal core task. For example, in cases
+    *   where a core itself handles the loading of content from a file,
+    *   this may correspond to the percentage of the file that has been
+    *   read. Alternatively, an audio/video playback core may use a
+    *   message of type RETRO_MESSAGE_TYPE_PROGRESS to display the current
+    *   playback position as a percentage of the runtime. 'Progress' type
+    *   messages should therefore be displayed as a literal progress bar,
+    *   where:
+    *   - 'retro_message_ext.msg' is the progress bar title/label
+    *   - 'retro_message_ext.progress' determines the length of
+    *     the progress bar
+    * NOTE: Message type is a *hint*, and may be ignored
+    * by the frontend. If a frontend lacks support for
+    * displaying messages via alternate means than standard
+    * frontend-generated notifications, it will treat *all*
+    * messages as having the type RETRO_MESSAGE_TYPE_NOTIFICATION */
+   enum retro_message_type type;
+   /* Task progress when targeting the OSD and message is
+    * of type RETRO_MESSAGE_TYPE_PROGRESS
+    * > -1:    Unmetered/indeterminate
+    * > 0-100: Current progress percentage
+    * NOTE: Since message type is a hint, a frontend may ignore
+    * progress values. Where relevant, a core should therefore
+    * include progress percentage within the message string,
+    * such that the message intent remains clear when displayed
+    * as a standard frontend-generated notification */
+   int8_t progress;
+};
+
+/* Describes how the libretro implementation maps a libretro input bind
+ * to its internal input system through a human readable string.
+ * This string can be used to better let a user configure input. */
+struct retro_input_descriptor
+{
+   /* Associates given parameters with a description. */
+   unsigned port;
+   unsigned device;
+   unsigned index;
+   unsigned id;
+
+   /* Human readable description for parameters.
+    * The pointer must remain valid until
+    * retro_unload_game() is called. */
+   const char *description;
+};
+
+struct retro_system_info
+{
+   /* All pointers are owned by libretro implementation, and pointers must
+    * remain valid until it is unloaded. */
+
+   const char *library_name;      /* Descriptive name of library. Should not
+                                   * contain any version numbers, etc. */
+   const char *library_version;   /* Descriptive version of core. */
+
+   const char *valid_extensions;  /* A string listing probably content
+                                   * extensions the core will be able to
+                                   * load, separated with pipe.
+                                   * I.e. "bin|rom|iso".
+                                   * Typically used for a GUI to filter
+                                   * out extensions. */
+
+   /* Libretro cores that need to have direct access to their content
+    * files, including cores which use the path of the content files to
+    * determine the paths of other files, should set need_fullpath to true.
+    *
+    * Cores should strive for setting need_fullpath to false,
+    * as it allows the frontend to perform patching, etc.
+    *
+    * If need_fullpath is true and retro_load_game() is called:
+    *    - retro_game_info::path is guaranteed to have a valid path
+    *    - retro_game_info::data and retro_game_info::size are invalid
+    *
+    * If need_fullpath is false and retro_load_game() is called:
+    *    - retro_game_info::path may be NULL
+    *    - retro_game_info::data and retro_game_info::size are guaranteed
+    *      to be valid
+    *
+    * See also:
+    *    - RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY
+    *    - RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY
+    */
+   bool        need_fullpath;
+
+   /* If true, the frontend is not allowed to extract any archives before
+    * loading the real content.
+    * Necessary for certain libretro implementations that load games
+    * from zipped archives. */
+   bool        block_extract;
+};
+
+/* Defines overrides which modify frontend handling of
+ * specific content file types.
+ * An array of retro_system_content_info_override is
+ * passed to RETRO_ENVIRONMENT_SET_CONTENT_INFO_OVERRIDE
+ * NOTE: In the following descriptions, references to
+ *       retro_load_game() may be replaced with
+ *       retro_load_game_special() */
+struct retro_system_content_info_override
+{
+   /* A list of file extensions for which the override
+    * should apply, delimited by a 'pipe' character
+    * (e.g. "md|sms|gg")
+    * Permitted file extensions are limited to those
+    * included in retro_system_info::valid_extensions
+    * and/or retro_subsystem_rom_info::valid_extensions */
+   const char *extensions;
+
+   /* Overrides the need_fullpath value set in
+    * retro_system_info and/or retro_subsystem_rom_info.
+    * To reiterate:
+    *
+    * If need_fullpath is true and retro_load_game() is called:
+    *    - retro_game_info::path is guaranteed to contain a valid
+    *      path to an existent file
+    *    - retro_game_info::data and retro_game_info::size are invalid
+    *
+    * If need_fullpath is false and retro_load_game() is called:
+    *    - retro_game_info::path may be NULL
+    *    - retro_game_info::data and retro_game_info::size are guaranteed
+    *      to be valid
+    *
+    * In addition:
+    *
+    * If need_fullpath is true and retro_load_game() is called:
+    *    - retro_game_info_ext::full_path is guaranteed to contain a valid
+    *      path to an existent file
+    *    - retro_game_info_ext::archive_path may be NULL
+    *    - retro_game_info_ext::archive_file may be NULL
+    *    - retro_game_info_ext::dir is guaranteed to contain a valid path
+    *      to the directory in which the content file exists
+    *    - retro_game_info_ext::name is guaranteed to contain the
+    *      basename of the content file, without extension
+    *    - retro_game_info_ext::ext is guaranteed to contain the
+    *      extension of the content file in lower case format
+    *    - retro_game_info_ext::data and retro_game_info_ext::size
+    *      are invalid
+    *
+    * If need_fullpath is false and retro_load_game() is called:
+    *    - If retro_game_info_ext::file_in_archive is false:
+    *       - retro_game_info_ext::full_path is guaranteed to contain
+    *         a valid path to an existent file
+    *       - retro_game_info_ext::archive_path may be NULL
+    *       - retro_game_info_ext::archive_file may be NULL
+    *       - retro_game_info_ext::dir is guaranteed to contain a
+    *         valid path to the directory in which the content file exists
+    *       - retro_game_info_ext::name is guaranteed to contain the
+    *         basename of the content file, without extension
+    *       - retro_game_info_ext::ext is guaranteed to contain the
+    *         extension of the content file in lower case format
+    *    - If retro_game_info_ext::file_in_archive is true:
+    *       - retro_game_info_ext::full_path may be NULL
+    *       - retro_game_info_ext::archive_path is guaranteed to
+    *         contain a valid path to an existent compressed file
+    *         inside which the content file is located
+    *       - retro_game_info_ext::archive_file is guaranteed to
+    *         contain a valid path to an existent content file
+    *         inside the compressed file referred to by
+    *         retro_game_info_ext::archive_path
+    *            e.g. for a compressed file '/path/to/foo.zip'
+    *            containing 'bar.sfc'
+    *             > retro_game_info_ext::archive_path will be '/path/to/foo.zip'
+    *             > retro_game_info_ext::archive_file will be 'bar.sfc'
+    *       - retro_game_info_ext::dir is guaranteed to contain a
+    *         valid path to the directory in which the compressed file
+    *         (containing the content file) exists
+    *       - retro_game_info_ext::name is guaranteed to contain
+    *         EITHER
+    *         1) the basename of the compressed file (containing
+    *            the content file), without extension
+    *         OR
+    *         2) the basename of the content file inside the
+    *            compressed file, without extension
+    *         In either case, a core should consider 'name' to
+    *         be the canonical name/ID of the the content file
+    *       - retro_game_info_ext::ext is guaranteed to contain the
+    *         extension of the content file inside the compressed file,
+    *         in lower case format
+    *    - retro_game_info_ext::data and retro_game_info_ext::size are
+    *      guaranteed to be valid */
+   bool need_fullpath;
+
+   /* If need_fullpath is false, specifies whether the content
+    * data buffer available in retro_load_game() is 'persistent'
+    *
+    * If persistent_data is false and retro_load_game() is called:
+    *    - retro_game_info::data and retro_game_info::size
+    *      are valid only until retro_load_game() returns
+    *    - retro_game_info_ext::data and retro_game_info_ext::size
+    *      are valid only until retro_load_game() returns
+    *
+    * If persistent_data is true and retro_load_game() is called:
+    *    - retro_game_info::data and retro_game_info::size
+    *      are valid until retro_deinit() returns
+    *    - retro_game_info_ext::data and retro_game_info_ext::size
+    *      are valid until retro_deinit() returns */
+   bool persistent_data;
+};
+
+/* Similar to retro_game_info, but provides extended
+ * information about the source content file and
+ * game memory buffer status.
+ * And array of retro_game_info_ext is returned by
+ * RETRO_ENVIRONMENT_GET_GAME_INFO_EXT
+ * NOTE: In the following descriptions, references to
+ *       retro_load_game() may be replaced with
+ *       retro_load_game_special() */
+struct retro_game_info_ext
+{
+   /* - If file_in_archive is false, contains a valid
+    *   path to an existent content file (UTF-8 encoded)
+    * - If file_in_archive is true, may be NULL */
+   const char *full_path;
+
+   /* - If file_in_archive is false, may be NULL
+    * - If file_in_archive is true, contains a valid path
+    *   to an existent compressed file inside which the
+    *   content file is located (UTF-8 encoded) */
+   const char *archive_path;
+
+   /* - If file_in_archive is false, may be NULL
+    * - If file_in_archive is true, contain a valid path
+    *   to an existent content file inside the compressed
+    *   file referred to by archive_path (UTF-8 encoded)
+    *      e.g. for a compressed file '/path/to/foo.zip'
+    *      containing 'bar.sfc'
+    *      > archive_path will be '/path/to/foo.zip'
+    *      > archive_file will be 'bar.sfc' */
+   const char *archive_file;
+
+   /* - If file_in_archive is false, contains a valid path
+    *   to the directory in which the content file exists
+    *   (UTF-8 encoded)
+    * - If file_in_archive is true, contains a valid path
+    *   to the directory in which the compressed file
+    *   (containing the content file) exists (UTF-8 encoded) */
+   const char *dir;
+
+   /* Contains the canonical name/ID of the content file
+    * (UTF-8 encoded). Intended for use when identifying
+    * 'complementary' content named after the loaded file -
+    * i.e. companion data of a different format (a CD image
+    * required by a ROM), texture packs, internally handled
+    * save files, etc.
+    * - If file_in_archive is false, contains the basename
+    *   of the content file, without extension
+    * - If file_in_archive is true, then string is
+    *   implementation specific. A frontend may choose to
+    *   set a name value of:
+    *   EITHER
+    *   1) the basename of the compressed file (containing
+    *      the content file), without extension
+    *   OR
+    *   2) the basename of the content file inside the
+    *      compressed file, without extension
+    *   RetroArch sets the 'name' value according to (1).
+    *   A frontend that supports routine loading of
+    *   content from archives containing multiple unrelated
+    *   content files may set the 'name' value according
+    *   to (2). */
+   const char *name;
+
+   /* - If file_in_archive is false, contains the extension
+    *   of the content file in lower case format
+    * - If file_in_archive is true, contains the extension
+    *   of the content file inside the compressed file,
+    *   in lower case format */
+   const char *ext;
+
+   /* String of implementation specific meta-data. */
+   const char *meta;
+
+   /* Memory buffer of loaded game content. Will be NULL:
+    * IF
+    * - retro_system_info::need_fullpath is true and
+    *   retro_system_content_info_override::need_fullpath
+    *   is unset
+    * OR
+    * - retro_system_content_info_override::need_fullpath
+    *   is true */
+   const void *data;
+
+   /* Size of game content memory buffer, in bytes */
+   size_t size;
+
+   /* True if loaded content file is inside a compressed
+    * archive */
+   bool file_in_archive;
+
+   /* - If data is NULL, value is unset/ignored
+    * - If data is non-NULL:
+    *   - If persistent_data is false, data and size are
+    *     valid only until retro_load_game() returns
+    *   - If persistent_data is true, data and size are
+    *     are valid until retro_deinit() returns */
+   bool persistent_data;
+};
+
+struct retro_game_geometry
+{
+   unsigned base_width;    /* Nominal video width of game. */
+   unsigned base_height;   /* Nominal video height of game. */
+   unsigned max_width;     /* Maximum possible width of game. */
+   unsigned max_height;    /* Maximum possible height of game. */
+
+   float    aspect_ratio;  /* Nominal aspect ratio of game. If
+                            * aspect_ratio is <= 0.0, an aspect ratio
+                            * of base_width / base_height is assumed.
+                            * A frontend could override this setting,
+                            * if desired. */
+};
+
+struct retro_system_timing
+{
+   double fps;             /* FPS of video content. */
+   double sample_rate;     /* Sampling rate of audio. */
+};
+
+struct retro_system_av_info
+{
+   struct retro_game_geometry geometry;
+   struct retro_system_timing timing;
+};
+
+struct retro_variable
+{
+   /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE.
+    * If NULL, obtains the complete environment string if more
+    * complex parsing is necessary.
+    * The environment string is formatted as key-value pairs
+    * delimited by semicolons as so:
+    * "key1=value1;key2=value2;..."
+    */
+   const char *key;
+
+   /* Value to be obtained. If key does not exist, it is set to NULL. */
+   const char *value;
+};
+
+struct retro_core_option_display
+{
+   /* Variable to configure in RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY */
+   const char *key;
+
+   /* Specifies whether variable should be displayed
+    * when presenting core options to the user */
+   bool visible;
+};
+
+/* Maximum number of values permitted for a core option
+ * > Note: We have to set a maximum value due the limitations
+ *   of the C language - i.e. it is not possible to create an
+ *   array of structs each containing a variable sized array,
+ *   so the retro_core_option_definition values array must
+ *   have a fixed size. The size limit of 128 is a balancing
+ *   act - it needs to be large enough to support all 'sane'
+ *   core options, but setting it too large may impact low memory
+ *   platforms. In practise, if a core option has more than
+ *   128 values then the implementation is likely flawed.
+ *   To quote the above API reference:
+ *      "The number of possible options should be very limited
+ *       i.e. it should be feasible to cycle through options
+ *       without a keyboard."
+ */
+#define RETRO_NUM_CORE_OPTION_VALUES_MAX 128
+
+struct retro_core_option_value
+{
+   /* Expected option value */
+   const char *value;
+
+   /* Human-readable value label. If NULL, value itself
+    * will be displayed by the frontend */
+   const char *label;
+};
+
+struct retro_core_option_definition
+{
+   /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE. */
+   const char *key;
+
+   /* Human-readable core option description (used as menu label) */
+   const char *desc;
+
+   /* Human-readable core option information (used as menu sublabel) */
+   const char *info;
+
+   /* Array of retro_core_option_value structs, terminated by NULL */
+   struct retro_core_option_value values[RETRO_NUM_CORE_OPTION_VALUES_MAX];
+
+   /* Default core option value. Must match one of the values
+    * in the retro_core_option_value array, otherwise will be
+    * ignored */
+   const char *default_value;
+};
+
+struct retro_core_options_intl
+{
+   /* Pointer to an array of retro_core_option_definition structs
+    * - US English implementation
+    * - Must point to a valid array */
+   struct retro_core_option_definition *us;
+
+   /* Pointer to an array of retro_core_option_definition structs
+    * - Implementation for current frontend language
+    * - May be NULL */
+   struct retro_core_option_definition *local;
+};
+
+struct retro_core_option_v2_category
+{
+   /* Variable uniquely identifying the
+    * option category. Valid key characters
+    * are [a-z, A-Z, 0-9, _, -] */
+   const char *key;
+
+   /* Human-readable category description
+    * > Used as category menu label when
+    *   frontend has core option category
+    *   support */
+   const char *desc;
+
+   /* Human-readable category information
+    * > Used as category menu sublabel when
+    *   frontend has core option category
+    *   support
+    * > Optional (may be NULL or an empty
+    *   string) */
+   const char *info;
+};
+
+struct retro_core_option_v2_definition
+{
+   /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE.
+    * Valid key characters are [a-z, A-Z, 0-9, _, -] */
+   const char *key;
+
+   /* Human-readable core option description
+    * > Used as menu label when frontend does
+    *   not have core option category support
+    *   e.g. "Video > Aspect Ratio" */
+   const char *desc;
+
+   /* Human-readable core option description
+    * > Used as menu label when frontend has
+    *   core option category support
+    *   e.g. "Aspect Ratio", where associated
+    *   retro_core_option_v2_category::desc
+    *   is "Video"
+    * > If empty or NULL, the string specified by
+    *   desc will be used as the menu label
+    * > Will be ignored (and may be set to NULL)
+    *   if category_key is empty or NULL */
+   const char *desc_categorized;
+
+   /* Human-readable core option information
+    * > Used as menu sublabel */
+   const char *info;
+
+   /* Human-readable core option information
+    * > Used as menu sublabel when frontend
+    *   has core option category support
+    *   (e.g. may be required when info text
+    *   references an option by name/desc,
+    *   and the desc/desc_categorized text
+    *   for that option differ)
+    * > If empty or NULL, the string specified by
+    *   info will be used as the menu sublabel
+    * > Will be ignored (and may be set to NULL)
+    *   if category_key is empty or NULL */
+   const char *info_categorized;
+
+   /* Variable specifying category (e.g. "video",
+    * "audio") that will be assigned to the option
+    * if frontend has core option category support.
+    * > Categorized options will be displayed in a
+    *   subsection/submenu of the frontend core
+    *   option interface
+    * > Specified string must match one of the
+    *   retro_core_option_v2_category::key values
+    *   in the associated retro_core_option_v2_category
+    *   array; If no match is not found, specified
+    *   string will be considered as NULL
+    * > If specified string is empty or NULL, option will
+    *   have no category and will be shown at the top
+    *   level of the frontend core option interface */
+   const char *category_key;
+
+   /* Array of retro_core_option_value structs, terminated by NULL */
+   struct retro_core_option_value values[RETRO_NUM_CORE_OPTION_VALUES_MAX];
+
+   /* Default core option value. Must match one of the values
+    * in the retro_core_option_value array, otherwise will be
+    * ignored */
+   const char *default_value;
+};
+
+struct retro_core_options_v2
+{
+   /* Array of retro_core_option_v2_category structs,
+    * terminated by NULL
+    * > If NULL, all entries in definitions array
+    *   will have no category and will be shown at
+    *   the top level of the frontend core option
+    *   interface
+    * > Will be ignored if frontend does not have
+    *   core option category support */
+   struct retro_core_option_v2_category *categories;
+
+   /* Array of retro_core_option_v2_definition structs,
+    * terminated by NULL */
+   struct retro_core_option_v2_definition *definitions;
+};
+
+struct retro_core_options_v2_intl
+{
+   /* Pointer to a retro_core_options_v2 struct
+    * > US English implementation
+    * > Must point to a valid struct */
+   struct retro_core_options_v2 *us;
+
+   /* Pointer to a retro_core_options_v2 struct
+    * - Implementation for current frontend language
+    * - May be NULL */
+   struct retro_core_options_v2 *local;
+};
+
+/* Used by the frontend to monitor changes in core option
+ * visibility. May be called each time any core option
+ * value is set via the frontend.
+ * - On each invocation, the core must update the visibility
+ *   of any dynamically hidden options using the
+ *   RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY environment
+ *   callback.
+ * - On the first invocation, returns 'true' if the visibility
+ *   of any core option has changed since the last call of
+ *   retro_load_game() or retro_load_game_special().
+ * - On each subsequent invocation, returns 'true' if the
+ *   visibility of any core option has changed since the last
+ *   time the function was called. */
+typedef bool (RETRO_CALLCONV *retro_core_options_update_display_callback_t)(void);
+struct retro_core_options_update_display_callback
+{
+   retro_core_options_update_display_callback_t callback;
+};
+
+struct retro_game_info
+{
+   const char *path;       /* Path to game, UTF-8 encoded.
+                            * Sometimes used as a reference for building other paths.
+                            * May be NULL if game was loaded from stdin or similar,
+                            * but in this case some cores will be unable to load `data`.
+                            * So, it is preferable to fabricate something here instead
+                            * of passing NULL, which will help more cores to succeed.
+                            * retro_system_info::need_fullpath requires
+                            * that this path is valid. */
+   const void *data;       /* Memory buffer of loaded game. Will be NULL
+                            * if need_fullpath was set. */
+   size_t      size;       /* Size of memory buffer. */
+   const char *meta;       /* String of implementation specific meta-data. */
+};
+
+#define RETRO_MEMORY_ACCESS_WRITE (1 << 0)
+   /* The core will write to the buffer provided by retro_framebuffer::data. */
+#define RETRO_MEMORY_ACCESS_READ (1 << 1)
+   /* The core will read from retro_framebuffer::data. */
+#define RETRO_MEMORY_TYPE_CACHED (1 << 0)
+   /* The memory in data is cached.
+    * If not cached, random writes and/or reading from the buffer is expected to be very slow. */
+struct retro_framebuffer
+{
+   void *data;                      /* The framebuffer which the core can render into.
+                                       Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER.
+                                       The initial contents of data are unspecified. */
+   unsigned width;                  /* The framebuffer width used by the core. Set by core. */
+   unsigned height;                 /* The framebuffer height used by the core. Set by core. */
+   size_t pitch;                    /* The number of bytes between the beginning of a scanline,
+                                       and beginning of the next scanline.
+                                       Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
+   enum retro_pixel_format format;  /* The pixel format the core must use to render into data.
+                                       This format could differ from the format used in
+                                       SET_PIXEL_FORMAT.
+                                       Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
+
+   unsigned access_flags;           /* How the core will access the memory in the framebuffer.
+                                       RETRO_MEMORY_ACCESS_* flags.
+                                       Set by core. */
+   unsigned memory_flags;           /* Flags telling core how the memory has been mapped.
+                                       RETRO_MEMORY_TYPE_* flags.
+                                       Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
+};
+
+/* Used by a libretro core to override the current
+ * fastforwarding mode of the frontend */
+struct retro_fastforwarding_override
+{
+   /* Specifies the runtime speed multiplier that
+    * will be applied when 'fastforward' is true.
+    * For example, a value of 5.0 when running 60 FPS
+    * content will cap the fast-forward rate at 300 FPS.
+    * Note that the target multiplier may not be achieved
+    * if the host hardware has insufficient processing
+    * power.
+    * Setting a value of 0.0 (or greater than 0.0 but
+    * less than 1.0) will result in an uncapped
+    * fast-forward rate (limited only by hardware
+    * capacity).
+    * If the value is negative, it will be ignored
+    * (i.e. the frontend will use a runtime speed
+    * multiplier of its own choosing) */
+   float ratio;
+
+   /* If true, fastforwarding mode will be enabled.
+    * If false, fastforwarding mode will be disabled. */
+   bool fastforward;
+
+   /* If true, and if supported by the frontend, an
+    * on-screen notification will be displayed while
+    * 'fastforward' is true.
+    * If false, and if supported by the frontend, any
+    * on-screen fast-forward notifications will be
+    * suppressed */
+   bool notification;
+
+   /* If true, the core will have sole control over
+    * when fastforwarding mode is enabled/disabled;
+    * the frontend will not be able to change the
+    * state set by 'fastforward' until either
+    * 'inhibit_toggle' is set to false, or the core
+    * is unloaded */
+   bool inhibit_toggle;
+};
+
+/* Callbacks */
+
+/* Environment callback. Gives implementations a way of performing
+ * uncommon tasks. Extensible. */
+typedef bool (RETRO_CALLCONV *retro_environment_t)(unsigned cmd, void *data);
+
+/* Render a frame. Pixel format is 15-bit 0RGB1555 native endian
+ * unless changed (see RETRO_ENVIRONMENT_SET_PIXEL_FORMAT).
+ *
+ * Width and height specify dimensions of buffer.
+ * Pitch specifices length in bytes between two lines in buffer.
+ *
+ * For performance reasons, it is highly recommended to have a frame
+ * that is packed in memory, i.e. pitch == width * byte_per_pixel.
+ * Certain graphic APIs, such as OpenGL ES, do not like textures
+ * that are not packed in memory.
+ */
+typedef void (RETRO_CALLCONV *retro_video_refresh_t)(const void *data, unsigned width,
+      unsigned height, size_t pitch);
+
+/* Renders a single audio frame. Should only be used if implementation
+ * generates a single sample at a time.
+ * Format is signed 16-bit native endian.
+ */
+typedef void (RETRO_CALLCONV *retro_audio_sample_t)(int16_t left, int16_t right);
+
+/* Renders multiple audio frames in one go.
+ *
+ * One frame is defined as a sample of left and right channels, interleaved.
+ * I.e. int16_t buf[4] = { l, r, l, r }; would be 2 frames.
+ * Only one of the audio callbacks must ever be used.
+ */
+typedef size_t (RETRO_CALLCONV *retro_audio_sample_batch_t)(const int16_t *data,
+      size_t frames);
+
+/* Polls input. */
+typedef void (RETRO_CALLCONV *retro_input_poll_t)(void);
+
+/* Queries for input for player 'port'. device will be masked with
+ * RETRO_DEVICE_MASK.
+ *
+ * Specialization of devices such as RETRO_DEVICE_JOYPAD_MULTITAP that
+ * have been set with retro_set_controller_port_device()
+ * will still use the higher level RETRO_DEVICE_JOYPAD to request input.
+ */
+typedef int16_t (RETRO_CALLCONV *retro_input_state_t)(unsigned port, unsigned device,
+      unsigned index, unsigned id);
+
+/* Sets callbacks. retro_set_environment() is guaranteed to be called
+ * before retro_init().
+ *
+ * The rest of the set_* functions are guaranteed to have been called
+ * before the first call to retro_run() is made. */
+RETRO_API void retro_set_environment(retro_environment_t);
+RETRO_API void retro_set_video_refresh(retro_video_refresh_t);
+RETRO_API void retro_set_audio_sample(retro_audio_sample_t);
+RETRO_API void retro_set_audio_sample_batch(retro_audio_sample_batch_t);
+RETRO_API void retro_set_input_poll(retro_input_poll_t);
+RETRO_API void retro_set_input_state(retro_input_state_t);
+
+/* Library global initialization/deinitialization. */
+RETRO_API void retro_init(void);
+RETRO_API void retro_deinit(void);
+
+/* Must return RETRO_API_VERSION. Used to validate ABI compatibility
+ * when the API is revised. */
+RETRO_API unsigned retro_api_version(void);
+
+/* Gets statically known system info. Pointers provided in *info
+ * must be statically allocated.
+ * Can be called at any time, even before retro_init(). */
+RETRO_API void retro_get_system_info(struct retro_system_info *info);
+
+/* Gets information about system audio/video timings and geometry.
+ * Can be called only after retro_load_game() has successfully completed.
+ * NOTE: The implementation of this function might not initialize every
+ * variable if needed.
+ * E.g. geom.aspect_ratio might not be initialized if core doesn't
+ * desire a particular aspect ratio. */
+RETRO_API void retro_get_system_av_info(struct retro_system_av_info *info);
+
+/* Sets device to be used for player 'port'.
+ * By default, RETRO_DEVICE_JOYPAD is assumed to be plugged into all
+ * available ports.
+ * Setting a particular device type is not a guarantee that libretro cores
+ * will only poll input based on that particular device type. It is only a
+ * hint to the libretro core when a core cannot automatically detect the
+ * appropriate input device type on its own. It is also relevant when a
+ * core can change its behavior depending on device type.
+ *
+ * As part of the core's implementation of retro_set_controller_port_device,
+ * the core should call RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS to notify the
+ * frontend if the descriptions for any controls have changed as a
+ * result of changing the device type.
+ */
+RETRO_API void retro_set_controller_port_device(unsigned port, unsigned device);
+
+/* Resets the current game. */
+RETRO_API void retro_reset(void);
+
+/* Runs the game for one video frame.
+ * During retro_run(), input_poll callback must be called at least once.
+ *
+ * If a frame is not rendered for reasons where a game "dropped" a frame,
+ * this still counts as a frame, and retro_run() should explicitly dupe
+ * a frame if GET_CAN_DUPE returns true.
+ * In this case, the video callback can take a NULL argument for data.
+ */
+RETRO_API void retro_run(void);
+
+/* Returns the amount of data the implementation requires to serialize
+ * internal state (save states).
+ * Between calls to retro_load_game() and retro_unload_game(), the
+ * returned size is never allowed to be larger than a previous returned
+ * value, to ensure that the frontend can allocate a save state buffer once.
+ */
+RETRO_API size_t retro_serialize_size(void);
+
+/* Serializes internal state. If failed, or size is lower than
+ * retro_serialize_size(), it should return false, true otherwise. */
+RETRO_API bool retro_serialize(void *data, size_t size);
+RETRO_API bool retro_unserialize(const void *data, size_t size);
+
+RETRO_API void retro_cheat_reset(void);
+RETRO_API void retro_cheat_set(unsigned index, bool enabled, const char *code);
+
+/* Loads a game.
+ * Return true to indicate successful loading and false to indicate load failure.
+ */
+RETRO_API bool retro_load_game(const struct retro_game_info *game);
+
+/* Loads a "special" kind of game. Should not be used,
+ * except in extreme cases. */
+RETRO_API bool retro_load_game_special(
+  unsigned game_type,
+  const struct retro_game_info *info, size_t num_info
+);
+
+/* Unloads the currently loaded game. Called before retro_deinit(void). */
+RETRO_API void retro_unload_game(void);
+
+/* Gets region of game. */
+RETRO_API unsigned retro_get_region(void);
+
+/* Gets region of memory. */
+RETRO_API void *retro_get_memory_data(unsigned id);
+RETRO_API size_t retro_get_memory_size(unsigned id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libretro-common/include/retro_assert.h b/libretro-common/include/retro_assert.h
new file mode 100644
index 0000000..79dbb32
--- /dev/null
+++ b/libretro-common/include/retro_assert.h
@@ -0,0 +1,35 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (retro_assert.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __RETRO_ASSERT_H
+#define __RETRO_ASSERT_H
+
+#include <assert.h>
+
+#ifdef RARCH_INTERNAL
+#include <stdio.h>
+#define retro_assert(cond) ((void)( (cond) || (printf("Assertion failed at %s:%d.\n", __FILE__, __LINE__), abort(), 0) ))
+#else
+#define retro_assert(cond) assert(cond)
+#endif
+
+#endif
diff --git a/libretro-common/include/retro_common_api.h b/libretro-common/include/retro_common_api.h
new file mode 100644
index 0000000..0f68b7d
--- /dev/null
+++ b/libretro-common/include/retro_common_api.h
@@ -0,0 +1,119 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (retro_common_api.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _LIBRETRO_COMMON_RETRO_COMMON_API_H
+#define _LIBRETRO_COMMON_RETRO_COMMON_API_H
+
+/*
+This file is designed to normalize the libretro-common compiling environment
+for public API headers. This should be leaner than a normal compiling environment,
+since it gets #included into other project's sources.
+*/
+
+/* ------------------------------------ */
+
+/*
+Ordinarily we want to put #ifdef __cplusplus extern "C" in C library
+headers to enable them to get used by c++ sources.
+However, we want to support building this library as C++ as well, so a
+special technique is called for.
+*/
+
+#define RETRO_BEGIN_DECLS
+#define RETRO_END_DECLS
+
+#ifdef __cplusplus
+
+#ifdef CXX_BUILD
+/* build wants everything to be built as c++, so no extern "C" */
+#else
+#undef RETRO_BEGIN_DECLS
+#undef RETRO_END_DECLS
+#define RETRO_BEGIN_DECLS extern "C" {
+#define RETRO_END_DECLS }
+#endif
+
+#else
+
+/* header is included by a C source file, so no extern "C" */
+
+#endif
+
+/*
+IMO, this non-standard ssize_t should not be used.
+However, it's a good example of how to handle something like this.
+*/
+#ifdef _MSC_VER
+#ifndef HAVE_SSIZE_T
+#define HAVE_SSIZE_T
+#if defined(_WIN64)
+typedef __int64 ssize_t;
+#elif defined(_WIN32)
+typedef int ssize_t;
+#endif
+#endif
+#elif defined(__MACH__)
+#include <sys/types.h>
+#endif
+
+#ifdef _MSC_VER
+#if _MSC_VER >= 1800
+#include <inttypes.h>
+#else
+#ifndef PRId64
+#define PRId64 "I64d"
+#define PRIu64 "I64u"
+#define PRIuPTR "Iu"
+#endif
+#endif
+#else
+/* C++11 says this one isn't needed, but apparently (some versions of) mingw require it anyways */
+/* https://stackoverflow.com/questions/8132399/how-to-printf-uint64-t-fails-with-spurious-trailing-in-format */
+/* https://github.com/libretro/RetroArch/issues/6009 */
+#ifndef __STDC_FORMAT_MACROS
+#define __STDC_FORMAT_MACROS 1
+#endif
+#include <inttypes.h>
+#endif
+#ifndef PRId64
+#error "inttypes.h is being screwy"
+#endif
+#define STRING_REP_INT64 "%" PRId64
+#define STRING_REP_UINT64 "%" PRIu64
+#define STRING_REP_USIZE "%" PRIuPTR
+
+/*
+I would like to see retro_inline.h moved in here; possibly boolean too.
+
+rationale: these are used in public APIs, and it is easier to find problems
+and write code that works the first time portably when theyre included uniformly
+than to do the analysis from scratch each time you think you need it, for each feature.
+
+Moreover it helps force you to make hard decisions: if you EVER bring in boolean.h,
+then you should pay the price everywhere, so you can see how much grief it will cause.
+
+Of course, another school of thought is that you should do as little damage as possible
+in as few places as possible...
+*/
+
+/* _LIBRETRO_COMMON_RETRO_COMMON_API_H */
+#endif
diff --git a/libretro-common/include/retro_environment.h b/libretro-common/include/retro_environment.h
new file mode 100644
index 0000000..1389eb5
--- /dev/null
+++ b/libretro-common/include/retro_environment.h
@@ -0,0 +1,114 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (retro_environment.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_ENVIRONMENT_H
+#define __LIBRETRO_SDK_ENVIRONMENT_H
+
+/*
+This file is designed to create a normalized environment for compiling
+libretro-common's private implementations, or any other sources which might
+enjoy use of it's environment (RetroArch for instance).
+This should be an elaborately crafted environment so that sources don't
+need to be full of platform-specific workarounds.
+*/
+
+#if defined (__cplusplus)
+#if 0
+printf("This is C++, version %d.\n", __cplusplus);
+#endif
+/* The expected values would be
+ *   199711L, for ISO/IEC 14882:1998 or 14882:2003
+ */
+
+#elif defined(__STDC__)
+/* This is standard C. */
+
+#if (__STDC__ == 1)
+/* The implementation is ISO-conforming. */
+#define __STDC_ISO__
+#else
+/* The implementation is not ISO-conforming. */
+#endif
+
+#if defined(__STDC_VERSION__)
+#if (__STDC_VERSION__ >= 201112L)
+/* This is C11. */
+#define __STDC_C11__
+#elif (__STDC_VERSION__ >= 199901L)
+/* This is C99. */
+#define __STDC_C99__
+#elif (__STDC_VERSION__ >= 199409L)
+/* This is C89 with amendment 1. */
+#define __STDC_C89__
+#define __STDC_C89_AMENDMENT_1__
+#else
+/* This is C89 without amendment 1. */
+#define __STDC_C89__
+#endif
+#else /* !defined(__STDC_VERSION__) */
+/* This is C89. __STDC_VERSION__ is not defined. */
+#define __STDC_C89__
+#endif
+
+#else   /* !defined(__STDC__) */
+/* This is not standard C. __STDC__ is not defined. */
+#endif
+
+#if defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
+/* Try to find out if we're compiling for WinRT or non-WinRT */
+#if defined(_MSC_VER) && defined(__has_include)
+#if __has_include(<winapifamily.h>)
+#define HAVE_WINAPIFAMILY_H 1
+#else
+#define HAVE_WINAPIFAMILY_H 0
+#endif
+
+/* If _USING_V110_SDK71_ is defined it means we are using the Windows XP toolset. */
+#elif defined(_MSC_VER) && (_MSC_VER >= 1700 && !_USING_V110_SDK71_)    /* _MSC_VER == 1700 for Visual Studio 2012 */
+#define HAVE_WINAPIFAMILY_H 1
+#else
+#define HAVE_WINAPIFAMILY_H 0
+#endif
+
+#if HAVE_WINAPIFAMILY_H
+#include <winapifamily.h>
+#define WINAPI_FAMILY_WINRT (!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP))
+#else
+#define WINAPI_FAMILY_WINRT 0
+#endif /* HAVE_WINAPIFAMILY_H */
+
+#if WINAPI_FAMILY_WINRT
+#undef __WINRT__
+#define __WINRT__ 1
+#endif
+
+/* MSVC obviously has to have some non-standard constants... */
+#if _M_IX86_FP == 1
+#define __SSE__ 1
+#elif _M_IX86_FP == 2 || (defined(_M_AMD64) || defined(_M_X64))
+#define __SSE__ 1
+#define __SSE2__ 1
+#endif
+
+#endif
+
+#endif
diff --git a/libretro-common/include/retro_inline.h b/libretro-common/include/retro_inline.h
index e4a21f6..b27d6dd 100644
--- a/libretro-common/include/retro_inline.h
+++ b/libretro-common/include/retro_inline.h
@@ -1,4 +1,4 @@
-/* Copyright  (C) 2010-2018 The RetroArch team
+/* Copyright  (C) 2010-2020 The RetroArch team
  *
  * ---------------------------------------------------------------------------------------
  * The following license statement only applies to this file (retro_inline.h).
diff --git a/libretro-common/include/retro_miscellaneous.h b/libretro-common/include/retro_miscellaneous.h
index 02aa521..f0dfb5c 100644
--- a/libretro-common/include/retro_miscellaneous.h
+++ b/libretro-common/include/retro_miscellaneous.h
@@ -1,4 +1,4 @@
-/* Copyright  (C) 2010-2017 The RetroArch team
+/* Copyright  (C) 2010-2020 The RetroArch team
  *
  * ---------------------------------------------------------------------------------------
  * The following license statement only applies to this file (retro_miscellaneous.h).
@@ -23,17 +23,24 @@
 #ifndef __RARCH_MISCELLANEOUS_H
 #define __RARCH_MISCELLANEOUS_H
 
+#define RARCH_MAX_SUBSYSTEMS 10
+#define RARCH_MAX_SUBSYSTEM_ROMS 10
+
 #include <stdint.h>
 #include <boolean.h>
 #include <retro_inline.h>
 
-#if defined(_WIN32) && !defined(_XBOX)
+#if defined(_WIN32)
+
+#if defined(_XBOX)
+#include <Xtl.h>
+#else
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
-#elif defined(_WIN32) && defined(_XBOX)
-#include <Xtl.h>
+#endif
+
 #endif
 
 #include <limits.h>
@@ -68,7 +75,7 @@ static INLINE bool bits_any_set(uint32_t* ptr, uint32_t count)
 }
 
 #ifndef PATH_MAX_LENGTH
-#if defined(_XBOX1) || defined(_3DS) || defined(PSP) || defined(GEKKO)|| defined(WIIU)
+#if defined(_XBOX1) || defined(_3DS) || defined(PSP) || defined(PS2) || defined(GEKKO)|| defined(WIIU) || defined(ORBIS) || defined(__PSL1GHT__) || defined(__PS3__)
 #define PATH_MAX_LENGTH 512
 #else
 #define PATH_MAX_LENGTH 4096
@@ -97,8 +104,8 @@ static INLINE bool bits_any_set(uint32_t* ptr, uint32_t count)
 #define BIT16_GET(a, bit)    (((a) >> ((bit) & 15)) & 1)
 #define BIT16_CLEAR_ALL(a)   ((a) = 0)
 
-#define BIT32_SET(a, bit)    ((a) |=  (1 << ((bit) & 31)))
-#define BIT32_CLEAR(a, bit)  ((a) &= ~(1 << ((bit) & 31)))
+#define BIT32_SET(a, bit)    ((a) |=  (UINT32_C(1) << ((bit) & 31)))
+#define BIT32_CLEAR(a, bit)  ((a) &= ~(UINT32_C(1) << ((bit) & 31)))
 #define BIT32_GET(a, bit)    (((a) >> ((bit) & 31)) & 1)
 #define BIT32_CLEAR_ALL(a)   ((a) = 0)
 
@@ -107,8 +114,8 @@ static INLINE bool bits_any_set(uint32_t* ptr, uint32_t count)
 #define BIT64_GET(a, bit)    (((a) >> ((bit) & 63)) & 1)
 #define BIT64_CLEAR_ALL(a)   ((a) = 0)
 
-#define BIT128_SET(a, bit)   ((a).data[(bit) >> 5] |=  (1 << ((bit) & 31)))
-#define BIT128_CLEAR(a, bit) ((a).data[(bit) >> 5] &= ~(1 << ((bit) & 31)))
+#define BIT128_SET(a, bit)   ((a).data[(bit) >> 5] |=  (UINT32_C(1) << ((bit) & 31)))
+#define BIT128_CLEAR(a, bit) ((a).data[(bit) >> 5] &= ~(UINT32_C(1) << ((bit) & 31)))
 #define BIT128_GET(a, bit)   (((a).data[(bit) >> 5] >> ((bit) & 31)) & 1)
 #define BIT128_CLEAR_ALL(a)  memset(&(a), 0, sizeof(a))
 
@@ -127,6 +134,16 @@ static INLINE bool bits_any_set(uint32_t* ptr, uint32_t count)
 #define BIT256_GET_PTR(a, bit)   BIT256_GET(*a, bit)
 #define BIT256_CLEAR_ALL_PTR(a)  BIT256_CLEAR_ALL(*a)
 
+#define BIT512_SET(a, bit)       BIT256_SET(a, bit)
+#define BIT512_CLEAR(a, bit)     BIT256_CLEAR(a, bit)
+#define BIT512_GET(a, bit)       BIT256_GET(a, bit)
+#define BIT512_CLEAR_ALL(a)      BIT256_CLEAR_ALL(a)
+
+#define BIT512_SET_PTR(a, bit)   BIT512_SET(*a, bit)
+#define BIT512_CLEAR_PTR(a, bit) BIT512_CLEAR(*a, bit)
+#define BIT512_GET_PTR(a, bit)   BIT512_GET(*a, bit)
+#define BIT512_CLEAR_ALL_PTR(a)  BIT512_CLEAR_ALL(*a)
+
 #define BITS_COPY16_PTR(a,bits) \
 { \
    BIT128_CLEAR_ALL_PTR(a); \
@@ -139,6 +156,13 @@ static INLINE bool bits_any_set(uint32_t* ptr, uint32_t count)
    BITS_GET_ELEM_PTR(a, 0) = (bits); \
 }
 
+#define BITS_COPY64_PTR(a,bits) \
+{ \
+   BIT128_CLEAR_ALL_PTR(a); \
+   BITS_GET_ELEM_PTR(a, 0) = (bits); \
+   BITS_GET_ELEM_PTR(a, 1) = (bits >> 32); \
+}
+
 /* Helper macros and struct to keep track of many booleans. */
 /* This struct has 256 bits. */
 typedef struct
@@ -146,4 +170,34 @@ typedef struct
    uint32_t data[8];
 } retro_bits_t;
 
+/* This struct has 512 bits. */
+typedef struct
+{
+   uint32_t data[16];
+} retro_bits_512_t;
+
+#ifdef _WIN32
+#  ifdef _WIN64
+#    define PRI_SIZET PRIu64
+#  else
+#    if _MSC_VER == 1800
+#      define PRI_SIZET PRIu32
+#    else
+#      define PRI_SIZET "u"
+#    endif
+#  endif
+#elif defined(PS2)
+#  define PRI_SIZET "u"
+#else
+#  if (SIZE_MAX == 0xFFFF)
+#    define PRI_SIZET "hu"
+#  elif (SIZE_MAX == 0xFFFFFFFF)
+#    define PRI_SIZET "u"
+#  elif (SIZE_MAX == 0xFFFFFFFFFFFFFFFF)
+#    define PRI_SIZET "lu"
+#  else
+#    error PRI_SIZET: unknown SIZE_MAX
+#  endif
+#endif
+
 #endif
diff --git a/libretro-common/include/streams/file_stream.h b/libretro-common/include/streams/file_stream.h
new file mode 100644
index 0000000..ab198b2
--- /dev/null
+++ b/libretro-common/include/streams/file_stream.h
@@ -0,0 +1,115 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (file_stream.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_FILE_STREAM_H
+#define __LIBRETRO_SDK_FILE_STREAM_H
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stddef.h>
+
+#include <sys/types.h>
+
+#include <libretro.h>
+#include <retro_common_api.h>
+#include <retro_inline.h>
+#include <boolean.h>
+
+#include <stdarg.h>
+#include <vfs/vfs_implementation.h>
+
+#define FILESTREAM_REQUIRED_VFS_VERSION 2
+
+RETRO_BEGIN_DECLS
+
+typedef struct RFILE RFILE;
+
+#define FILESTREAM_REQUIRED_VFS_VERSION 2
+
+void filestream_vfs_init(const struct retro_vfs_interface_info* vfs_info);
+
+int64_t filestream_get_size(RFILE *stream);
+
+int64_t filestream_truncate(RFILE *stream, int64_t length);
+
+/**
+ * filestream_open:
+ * @path               : path to file
+ * @mode               : file mode to use when opening (read/write)
+ * @bufsize            : optional buffer size (-1 or 0 to use default)
+ *
+ * Opens a file for reading or writing, depending on the requested mode.
+ * Returns a pointer to an RFILE if opened successfully, otherwise NULL.
+ **/
+RFILE* filestream_open(const char *path, unsigned mode, unsigned hints);
+
+int64_t filestream_seek(RFILE *stream, int64_t offset, int seek_position);
+
+int64_t filestream_read(RFILE *stream, void *data, int64_t len);
+
+int64_t filestream_write(RFILE *stream, const void *data, int64_t len);
+
+int64_t filestream_tell(RFILE *stream);
+
+void filestream_rewind(RFILE *stream);
+
+int filestream_close(RFILE *stream);
+
+int64_t filestream_read_file(const char *path, void **buf, int64_t *len);
+
+char* filestream_gets(RFILE *stream, char *s, size_t len);
+
+int filestream_getc(RFILE *stream);
+
+int filestream_scanf(RFILE *stream, const char* format, ...);
+
+int filestream_eof(RFILE *stream);
+
+bool filestream_write_file(const char *path, const void *data, int64_t size);
+
+int filestream_putc(RFILE *stream, int c);
+
+int filestream_vprintf(RFILE *stream, const char* format, va_list args);
+
+int filestream_printf(RFILE *stream, const char* format, ...);
+
+int filestream_error(RFILE *stream);
+
+int filestream_flush(RFILE *stream);
+
+int filestream_delete(const char *path);
+
+int filestream_rename(const char *old_path, const char *new_path);
+
+const char* filestream_get_path(RFILE *stream);
+
+bool filestream_exists(const char *path);
+
+/* Returned pointer must be freed by the caller. */
+char* filestream_getline(RFILE *stream);
+
+libretro_vfs_implementation_file* filestream_get_vfs_handle(RFILE *stream);
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/include/string/stdstring.h b/libretro-common/include/string/stdstring.h
new file mode 100644
index 0000000..e7087d6
--- /dev/null
+++ b/libretro-common/include/string/stdstring.h
@@ -0,0 +1,250 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (stdstring.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_STDSTRING_H
+#define __LIBRETRO_SDK_STDSTRING_H
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <ctype.h>
+#include <string.h>
+#include <boolean.h>
+
+#include <retro_common_api.h>
+#include <retro_inline.h>
+#include <compat/strl.h>
+
+RETRO_BEGIN_DECLS
+
+#define STRLEN_CONST(x)                   ((sizeof((x))-1))
+
+#define strcpy_literal(a, b)              strcpy(a, b)
+
+#define string_is_not_equal(a, b)         !string_is_equal((a), (b))
+
+#define string_is_not_equal_fast(a, b, size) (memcmp(a, b, size) != 0)
+#define string_is_equal_fast(a, b, size)     (memcmp(a, b, size) == 0)
+
+#define TOLOWER(c)   ((c) |  (lr_char_props[(unsigned char)(c)] & 0x20))
+#define TOUPPER(c)   ((c) & ~(lr_char_props[(unsigned char)(c)] & 0x20))
+
+/* C standard says \f \v are space, but this one disagrees */
+#define ISSPACE(c)   (lr_char_props[(unsigned char)(c)] & 0x80) 
+
+#define ISDIGIT(c)   (lr_char_props[(unsigned char)(c)] & 0x40)
+#define ISALPHA(c)   (lr_char_props[(unsigned char)(c)] & 0x20)
+#define ISLOWER(c)   (lr_char_props[(unsigned char)(c)] & 0x04)
+#define ISUPPER(c)   (lr_char_props[(unsigned char)(c)] & 0x02)
+#define ISALNUM(c)   (lr_char_props[(unsigned char)(c)] & 0x60)
+#define ISUALPHA(c)  (lr_char_props[(unsigned char)(c)] & 0x28)
+#define ISUALNUM(c)  (lr_char_props[(unsigned char)(c)] & 0x68)
+#define IS_XDIGIT(c) (lr_char_props[(unsigned char)(c)] & 0x01)
+
+/* Deprecated alias, all callers should use string_is_equal_case_insensitive instead */
+#define string_is_equal_noncase string_is_equal_case_insensitive
+
+static INLINE bool string_is_empty(const char *data)
+{
+   return !data || (*data == '\0');
+}
+
+static INLINE bool string_is_equal(const char *a, const char *b)
+{
+   return (a && b) ? !strcmp(a, b) : false;
+}
+
+static INLINE bool string_starts_with_size(const char *str, const char *prefix,
+      size_t size)
+{
+   return (str && prefix) ? !strncmp(prefix, str, size) : false;
+}
+
+static INLINE bool string_starts_with(const char *str, const char *prefix)
+{
+   return (str && prefix) ? !strncmp(prefix, str, strlen(prefix)) : false;
+}
+
+static INLINE bool string_ends_with_size(const char *str, const char *suffix,
+      size_t str_len, size_t suffix_len)
+{
+   return (str_len < suffix_len) ? false :
+         !memcmp(suffix, str + (str_len - suffix_len), suffix_len);
+}
+
+static INLINE bool string_ends_with(const char *str, const char *suffix)
+{
+   if (!str || !suffix)
+      return false;
+   return string_ends_with_size(str, suffix, strlen(str), strlen(suffix));
+}
+
+/* Returns the length of 'str' (c.f. strlen()), but only
+ * checks the first 'size' characters
+ * - If 'str' is NULL, returns 0
+ * - If 'str' is not NULL and no '\0' character is found
+ *   in the first 'size' characters, returns 'size' */
+static INLINE size_t strlen_size(const char *str, size_t size)
+{
+   size_t i = 0;
+   if (str)
+      while (i < size && str[i]) i++;
+   return i;
+}
+
+
+static INLINE bool string_is_equal_case_insensitive(const char *a,
+      const char *b)
+{
+   int result              = 0;
+   const unsigned char *p1 = (const unsigned char*)a;
+   const unsigned char *p2 = (const unsigned char*)b;
+
+   if (!a || !b)
+      return false;
+   if (p1 == p2)
+      return true;
+
+   while ((result = tolower (*p1) - tolower (*p2++)) == 0)
+      if (*p1++ == '\0')
+         break;
+
+   return (result == 0);
+}
+
+char *string_to_upper(char *s);
+
+char *string_to_lower(char *s);
+
+char *string_ucwords(char *s);
+
+char *string_replace_substring(const char *in, const char *pattern,
+      const char *by);
+
+/* Remove leading whitespaces */
+char *string_trim_whitespace_left(char *const s);
+
+/* Remove trailing whitespaces */
+char *string_trim_whitespace_right(char *const s);
+
+/* Remove leading and trailing whitespaces */
+char *string_trim_whitespace(char *const s);
+
+/*
+ * Wraps string specified by 'src' to destination buffer
+ * specified by 'dst' and 'dst_size'.
+ * This function assumes that all glyphs in the string
+ * have an on-screen pixel width similar to that of
+ * regular Latin characters - i.e. it will not wrap
+ * correctly any text containing so-called 'wide' Unicode
+ * characters (e.g. CJK languages, emojis, etc.).
+ *
+ * @param dst             pointer to destination buffer.
+ * @param dst_size        size of destination buffer.
+ * @param src             pointer to input string.
+ * @param line_width      max number of characters per line.
+ * @param wideglyph_width not used, but is necessary to keep
+ *                        compatibility with word_wrap_wideglyph().
+ * @param max_lines       max lines of destination string.
+ *                        0 means no limit.
+ */
+void word_wrap(char *dst, size_t dst_size, const char *src,
+      int line_width, int wideglyph_width, unsigned max_lines);
+
+/*
+ * Wraps string specified by 'src' to destination buffer
+ * specified by 'dst' and 'dst_size'.
+ * This function assumes that all glyphs in the string
+ * are:
+ * - EITHER 'non-wide' Unicode glyphs, with an on-screen
+ *   pixel width similar to that of regular Latin characters
+ * - OR 'wide' Unicode glyphs (e.g. CJK languages, emojis, etc.)
+ *   with an on-screen pixel width defined by 'wideglyph_width'
+ * Note that wrapping may occur in inappropriate locations
+ * if 'src' string contains 'wide' Unicode characters whose
+ * on-screen pixel width deviates greatly from the set
+ * 'wideglyph_width' value.
+ *
+ * @param dst             pointer to destination buffer.
+ * @param dst_size        size of destination buffer.
+ * @param src             pointer to input string.
+ * @param line_width      max number of characters per line.
+ * @param wideglyph_width effective width of 'wide' Unicode glyphs.
+ *                        the value here is normalised relative to the
+ *                        typical on-screen pixel width of a regular
+ *                        Latin character:
+ *                        - a regular Latin character is defined to
+ *                          have an effective width of 100
+ *                        - wideglyph_width = 100 * (wide_character_pixel_width / latin_character_pixel_width)
+ *                        - e.g. if 'wide' Unicode characters in 'src'
+ *                          have an on-screen pixel width twice that of
+ *                          regular Latin characters, wideglyph_width
+ *                          would be 200
+ * @param max_lines       max lines of destination string.
+ *                        0 means no limit.
+ */
+void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src,
+      int line_width, int wideglyph_width, unsigned max_lines);
+
+/* Splits string into tokens seperated by 'delim'
+ * > Returned token string must be free()'d
+ * > Returns NULL if token is not found
+ * > After each call, 'str' is set to the position after the
+ *   last found token
+ * > Tokens *include* empty strings
+ * Usage example:
+ *    char *str      = "1,2,3,4,5,6,7,,,10,";
+ *    char **str_ptr = &str;
+ *    char *token    = NULL;
+ *    while ((token = string_tokenize(str_ptr, ",")))
+ *    {
+ *        printf("%s\n", token);
+ *        free(token);
+ *        token = NULL;
+ *    }
+ */
+char* string_tokenize(char **str, const char *delim);
+
+/* Removes every instance of character 'c' from 'str' */
+void string_remove_all_chars(char *str, char c);
+
+/* Replaces every instance of character 'find' in 'str'
+ * with character 'replace' */
+void string_replace_all_chars(char *str, char find, char replace);
+
+/* Converts string to unsigned integer.
+ * Returns 0 if string is invalid  */
+unsigned string_to_unsigned(const char *str);
+
+/* Converts hexadecimal string to unsigned integer.
+ * Handles optional leading '0x'.
+ * Returns 0 if string is invalid  */
+unsigned string_hex_to_unsigned(const char *str);
+
+char *string_init(const char *src);
+
+void string_set(char **string, const char *src);
+
+extern const unsigned char lr_char_props[256];
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/include/time/rtime.h b/libretro-common/include/time/rtime.h
new file mode 100644
index 0000000..7629c1e
--- /dev/null
+++ b/libretro-common/include/time/rtime.h
@@ -0,0 +1,48 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (rtime.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_RTIME_H__
+#define __LIBRETRO_SDK_RTIME_H__
+
+#include <retro_common_api.h>
+
+#include <stdint.h>
+#include <stddef.h>
+#include <time.h>
+
+RETRO_BEGIN_DECLS
+
+/* TODO/FIXME: Move all generic time handling functions
+ * to this file */
+
+/* Must be called before using rtime_localtime() */
+void rtime_init(void);
+
+/* Must be called upon program termination */
+void rtime_deinit(void);
+
+/* Thread-safe wrapper for localtime() */
+struct tm *rtime_localtime(const time_t *timep, struct tm *result);
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/include/vfs/vfs.h b/libretro-common/include/vfs/vfs.h
new file mode 100644
index 0000000..5366f33
--- /dev/null
+++ b/libretro-common/include/vfs/vfs.h
@@ -0,0 +1,111 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+*
+* ---------------------------------------------------------------------------------------
+* The following license statement only applies to this file (vfs_implementation.h).
+* ---------------------------------------------------------------------------------------
+*
+* Permission is hereby granted, free of charge,
+* to any person obtaining a copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef __LIBRETRO_SDK_VFS_H
+#define __LIBRETRO_SDK_VFS_H
+
+#include <retro_common_api.h>
+#include <boolean.h>
+
+#ifdef RARCH_INTERNAL
+#ifndef VFS_FRONTEND
+#define VFS_FRONTEND
+#endif
+#endif
+
+RETRO_BEGIN_DECLS
+
+#ifdef _WIN32
+typedef void* HANDLE;
+#endif
+
+#ifdef HAVE_CDROM
+typedef struct
+{
+   int64_t byte_pos;
+   char *cue_buf;
+   size_t cue_len;
+   unsigned cur_lba;
+   unsigned last_frame_lba;
+   unsigned char cur_min;
+   unsigned char cur_sec;
+   unsigned char cur_frame;
+   unsigned char cur_track;
+   unsigned char last_frame[2352];
+   char drive;
+   bool last_frame_valid;
+} vfs_cdrom_t;
+#endif
+
+enum vfs_scheme
+{
+   VFS_SCHEME_NONE = 0,
+   VFS_SCHEME_CDROM
+};
+
+#ifndef __WINRT__
+#ifdef VFS_FRONTEND
+struct retro_vfs_file_handle
+#else
+struct libretro_vfs_implementation_file
+#endif
+{
+#ifdef HAVE_CDROM
+   vfs_cdrom_t cdrom; /* int64_t alignment */
+#endif
+   int64_t size;
+   uint64_t mappos;
+   uint64_t mapsize;
+   FILE *fp;
+#ifdef _WIN32
+   HANDLE fh;
+#endif
+   char *buf;
+   char* orig_path;
+   uint8_t *mapped;
+   int fd;
+   unsigned hints;
+   enum vfs_scheme scheme;
+};
+#endif
+
+/* Replace the following symbol with something appropriate
+ * to signify the file is being compiled for a front end instead of a core.
+ * This allows the same code to act as reference implementation
+ * for VFS and as fallbacks for when the front end does not provide VFS functionality.
+ */
+
+#ifdef VFS_FRONTEND
+typedef struct retro_vfs_file_handle libretro_vfs_implementation_file;
+#else
+typedef struct libretro_vfs_implementation_file libretro_vfs_implementation_file;
+#endif
+
+#ifdef VFS_FRONTEND
+typedef struct retro_vfs_dir_handle libretro_vfs_implementation_dir;
+#else
+typedef struct libretro_vfs_implementation_dir libretro_vfs_implementation_dir;
+#endif
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/include/vfs/vfs_implementation.h b/libretro-common/include/vfs/vfs_implementation.h
new file mode 100644
index 0000000..c7d6bb0
--- /dev/null
+++ b/libretro-common/include/vfs/vfs_implementation.h
@@ -0,0 +1,76 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+*
+* ---------------------------------------------------------------------------------------
+* The following license statement only applies to this file (vfs_implementation.h).
+* ---------------------------------------------------------------------------------------
+*
+* Permission is hereby granted, free of charge,
+* to any person obtaining a copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef __LIBRETRO_SDK_VFS_IMPLEMENTATION_H
+#define __LIBRETRO_SDK_VFS_IMPLEMENTATION_H
+
+#include <stdio.h>
+#include <stdint.h>
+#include <libretro.h>
+#include <retro_environment.h>
+#include <vfs/vfs.h>
+
+RETRO_BEGIN_DECLS
+
+libretro_vfs_implementation_file *retro_vfs_file_open_impl(const char *path, unsigned mode, unsigned hints);
+
+int retro_vfs_file_close_impl(libretro_vfs_implementation_file *stream);
+
+int retro_vfs_file_error_impl(libretro_vfs_implementation_file *stream);
+
+int64_t retro_vfs_file_size_impl(libretro_vfs_implementation_file *stream);
+
+int64_t retro_vfs_file_truncate_impl(libretro_vfs_implementation_file *stream, int64_t length);
+
+int64_t retro_vfs_file_tell_impl(libretro_vfs_implementation_file *stream);
+
+int64_t retro_vfs_file_seek_impl(libretro_vfs_implementation_file *stream, int64_t offset, int seek_position);
+
+int64_t retro_vfs_file_read_impl(libretro_vfs_implementation_file *stream, void *s, uint64_t len);
+
+int64_t retro_vfs_file_write_impl(libretro_vfs_implementation_file *stream, const void *s, uint64_t len);
+
+int retro_vfs_file_flush_impl(libretro_vfs_implementation_file *stream);
+
+int retro_vfs_file_remove_impl(const char *path);
+
+int retro_vfs_file_rename_impl(const char *old_path, const char *new_path);
+
+const char *retro_vfs_file_get_path_impl(libretro_vfs_implementation_file *stream);
+
+int retro_vfs_stat_impl(const char *path, int32_t *size);
+
+int retro_vfs_mkdir_impl(const char *dir);
+
+libretro_vfs_implementation_dir *retro_vfs_opendir_impl(const char *dir, bool include_hidden);
+
+bool retro_vfs_readdir_impl(libretro_vfs_implementation_dir *dirstream);
+
+const char *retro_vfs_dirent_get_name_impl(libretro_vfs_implementation_dir *dirstream);
+
+bool retro_vfs_dirent_is_dir_impl(libretro_vfs_implementation_dir *dirstream);
+
+int retro_vfs_closedir_impl(libretro_vfs_implementation_dir *dirstream);
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro-common/streams/file_stream.c b/libretro-common/streams/file_stream.c
new file mode 100644
index 0000000..c434237
--- /dev/null
+++ b/libretro-common/streams/file_stream.c
@@ -0,0 +1,663 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (file_stream.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <errno.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef _MSC_VER
+#include <compat/msvc.h>
+#endif
+
+#include <string/stdstring.h>
+#include <streams/file_stream.h>
+#define VFS_FRONTEND
+#include <vfs/vfs_implementation.h>
+
+#define VFS_ERROR_RETURN_VALUE -1
+
+struct RFILE
+{
+   struct retro_vfs_file_handle *hfile;
+	bool error_flag;
+	bool eof_flag;
+};
+
+static retro_vfs_get_path_t filestream_get_path_cb = NULL;
+static retro_vfs_open_t filestream_open_cb         = NULL;
+static retro_vfs_close_t filestream_close_cb       = NULL;
+static retro_vfs_size_t filestream_size_cb         = NULL;
+static retro_vfs_truncate_t filestream_truncate_cb = NULL;
+static retro_vfs_tell_t filestream_tell_cb         = NULL;
+static retro_vfs_seek_t filestream_seek_cb         = NULL;
+static retro_vfs_read_t filestream_read_cb         = NULL;
+static retro_vfs_write_t filestream_write_cb       = NULL;
+static retro_vfs_flush_t filestream_flush_cb       = NULL;
+static retro_vfs_remove_t filestream_remove_cb     = NULL;
+static retro_vfs_rename_t filestream_rename_cb     = NULL;
+
+/* VFS Initialization */
+
+void filestream_vfs_init(const struct retro_vfs_interface_info* vfs_info)
+{
+   const struct retro_vfs_interface *
+      vfs_iface           = vfs_info->iface;
+
+   filestream_get_path_cb = NULL;
+   filestream_open_cb     = NULL;
+   filestream_close_cb    = NULL;
+   filestream_tell_cb     = NULL;
+   filestream_size_cb     = NULL;
+   filestream_truncate_cb = NULL;
+   filestream_seek_cb     = NULL;
+   filestream_read_cb     = NULL;
+   filestream_write_cb    = NULL;
+   filestream_flush_cb    = NULL;
+   filestream_remove_cb   = NULL;
+   filestream_rename_cb   = NULL;
+
+   if (
+             (vfs_info->required_interface_version < 
+             FILESTREAM_REQUIRED_VFS_VERSION)
+         || !vfs_iface)
+      return;
+
+   filestream_get_path_cb = vfs_iface->get_path;
+   filestream_open_cb     = vfs_iface->open;
+   filestream_close_cb    = vfs_iface->close;
+   filestream_size_cb     = vfs_iface->size;
+   filestream_truncate_cb = vfs_iface->truncate;
+   filestream_tell_cb     = vfs_iface->tell;
+   filestream_seek_cb     = vfs_iface->seek;
+   filestream_read_cb     = vfs_iface->read;
+   filestream_write_cb    = vfs_iface->write;
+   filestream_flush_cb    = vfs_iface->flush;
+   filestream_remove_cb   = vfs_iface->remove;
+   filestream_rename_cb   = vfs_iface->rename;
+}
+
+/* Callback wrappers */
+bool filestream_exists(const char *path)
+{
+   RFILE *dummy           = NULL;
+
+   if (!path || !*path)
+      return false;
+
+   dummy                  = filestream_open(
+         path,
+         RETRO_VFS_FILE_ACCESS_READ,
+         RETRO_VFS_FILE_ACCESS_HINT_NONE);
+
+   if (!dummy)
+      return false;
+
+   if (filestream_close(dummy) != 0)
+      if (dummy)
+         free(dummy);
+
+   dummy = NULL;
+   return true;
+}
+
+int64_t filestream_get_size(RFILE *stream)
+{
+   int64_t output;
+
+   if (filestream_size_cb)
+      output = filestream_size_cb(stream->hfile);
+   else
+      output = retro_vfs_file_size_impl(
+            (libretro_vfs_implementation_file*)stream->hfile);
+
+   if (output == VFS_ERROR_RETURN_VALUE)
+      stream->error_flag = true;
+
+   return output;
+}
+
+int64_t filestream_truncate(RFILE *stream, int64_t length)
+{
+   int64_t output;
+
+   if (filestream_truncate_cb)
+      output = filestream_truncate_cb(stream->hfile, length);
+   else
+      output = retro_vfs_file_truncate_impl(
+            (libretro_vfs_implementation_file*)stream->hfile, length);
+
+   if (output == VFS_ERROR_RETURN_VALUE)
+      stream->error_flag = true;
+
+   return output;
+}
+
+/**
+ * filestream_open:
+ * @path               : path to file
+ * @mode               : file mode to use when opening (read/write)
+ * @hints              :
+ *
+ * Opens a file for reading or writing, depending on the requested mode.
+ * Returns a pointer to an RFILE if opened successfully, otherwise NULL.
+ **/
+RFILE* filestream_open(const char *path, unsigned mode, unsigned hints)
+{
+   struct retro_vfs_file_handle  *fp = NULL;
+   RFILE* output                     = NULL;
+
+   if (filestream_open_cb)
+      fp = (struct retro_vfs_file_handle*)
+         filestream_open_cb(path, mode, hints);
+   else
+      fp = (struct retro_vfs_file_handle*)
+         retro_vfs_file_open_impl(path, mode, hints);
+
+   if (!fp)
+      return NULL;
+
+   output             = (RFILE*)malloc(sizeof(RFILE));
+   output->error_flag = false;
+   output->eof_flag   = false;
+   output->hfile      = fp;
+   return output;
+}
+
+char* filestream_gets(RFILE *stream, char *s, size_t len)
+{
+   int c   = 0;
+   char *p = s;
+   if (!stream)
+      return NULL;
+
+   /* get max bytes or up to a newline */
+
+   for (len--; len > 0; len--)
+   {
+      if ((c = filestream_getc(stream)) == EOF)
+         break;
+      *p++ = c;
+      if (c == '\n')
+         break;
+   }
+   *p = 0;
+
+   if (p == s && c == EOF)
+      return NULL;
+   return (s);
+}
+
+int filestream_getc(RFILE *stream)
+{
+   char c = 0;
+   if (stream && filestream_read(stream, &c, 1) == 1)
+      return (int)(unsigned char)c;
+   return EOF;
+}
+
+int filestream_scanf(RFILE *stream, const char* format, ...)
+{
+   char buf[4096];
+   char subfmt[64];
+   va_list args;
+   const char * bufiter = buf;
+   int        ret       = 0;
+   int64_t startpos     = filestream_tell(stream);
+   int64_t maxlen       = filestream_read(stream, buf, sizeof(buf)-1);
+
+   if (maxlen <= 0)
+      return EOF;
+
+   buf[maxlen] = '\0';
+
+   va_start(args, format);
+
+   while (*format)
+   {
+      if (*format == '%')
+      {
+         int sublen;
+         char* subfmtiter = subfmt;
+         bool asterisk    = false;
+
+         *subfmtiter++    = *format++; /* '%' */
+
+         /* %[*][width][length]specifier */
+
+         if (*format == '*')
+         {
+            asterisk      = true;
+            *subfmtiter++ = *format++;
+         }
+
+         while (ISDIGIT((unsigned char)*format))
+            *subfmtiter++ = *format++; /* width */
+
+         /* length */
+         if (*format == 'h' || *format == 'l')
+         {
+            if (format[1] == format[0])
+               *subfmtiter++ = *format++;
+            *subfmtiter++    = *format++;
+         }
+         else if (
+               *format == 'j' || 
+               *format == 'z' || 
+               *format == 't' || 
+               *format == 'L')
+         {
+            *subfmtiter++ = *format++;
+         }
+
+         /* specifier - always a single character (except ]) */
+         if (*format == '[')
+         {
+            while (*format != ']')
+               *subfmtiter++ = *format++;
+            *subfmtiter++    = *format++;
+         }
+         else
+            *subfmtiter++    = *format++;
+
+         *subfmtiter++       = '%';
+         *subfmtiter++       = 'n';
+         *subfmtiter++       = '\0';
+
+         if (sizeof(void*) != sizeof(long*))
+            abort(); /* all pointers must have the same size */
+
+         if (asterisk)
+         {
+            int v = sscanf(bufiter, subfmt, &sublen);
+            if (v == EOF)
+               return EOF;
+            if (v != 0)
+               break;
+         }
+         else
+         {
+            int v = sscanf(bufiter, subfmt, va_arg(args, void*), &sublen);
+            if (v == EOF)
+               return EOF;
+            if (v != 1)
+               break;
+         }
+
+         ret++;
+         bufiter += sublen;
+      }
+      else if (isspace((unsigned char)*format))
+      {
+         while (isspace((unsigned char)*bufiter))
+            bufiter++;
+         format++;
+      }
+      else
+      {
+         if (*bufiter != *format)
+            break;
+         bufiter++;
+         format++;
+      }
+   }
+
+   va_end(args);
+   filestream_seek(stream, startpos+(bufiter-buf),
+         RETRO_VFS_SEEK_POSITION_START);
+
+   return ret;
+}
+
+int64_t filestream_seek(RFILE *stream, int64_t offset, int seek_position)
+{
+   int64_t output;
+
+   if (filestream_seek_cb)
+      output = filestream_seek_cb(stream->hfile, offset, seek_position);
+   else
+      output = retro_vfs_file_seek_impl(
+            (libretro_vfs_implementation_file*)stream->hfile,
+            offset, seek_position);
+
+   if (output == VFS_ERROR_RETURN_VALUE)
+      stream->error_flag = true;
+
+   stream->eof_flag      = false;
+
+   return output;
+}
+
+int filestream_eof(RFILE *stream)
+{
+   return stream->eof_flag;
+}
+
+int64_t filestream_tell(RFILE *stream)
+{
+   int64_t output;
+
+   if (filestream_size_cb)
+      output = filestream_tell_cb(stream->hfile);
+   else
+      output = retro_vfs_file_tell_impl(
+            (libretro_vfs_implementation_file*)stream->hfile);
+
+   if (output == VFS_ERROR_RETURN_VALUE)
+      stream->error_flag = true;
+
+   return output;
+}
+
+void filestream_rewind(RFILE *stream)
+{
+   if (!stream)
+      return;
+   filestream_seek(stream, 0L, RETRO_VFS_SEEK_POSITION_START);
+   stream->error_flag = false;
+   stream->eof_flag   = false;
+}
+
+int64_t filestream_read(RFILE *stream, void *s, int64_t len)
+{
+   int64_t output;
+
+   if (filestream_read_cb)
+      output = filestream_read_cb(stream->hfile, s, len);
+   else
+      output = retro_vfs_file_read_impl(
+            (libretro_vfs_implementation_file*)stream->hfile, s, len);
+
+   if (output == VFS_ERROR_RETURN_VALUE)
+      stream->error_flag = true;
+   if (output < len)
+      stream->eof_flag   = true;
+
+   return output;
+}
+
+int filestream_flush(RFILE *stream)
+{
+   int output;
+
+   if (filestream_flush_cb)
+      output = filestream_flush_cb(stream->hfile);
+   else
+      output = retro_vfs_file_flush_impl(
+            (libretro_vfs_implementation_file*)stream->hfile);
+
+   if (output == VFS_ERROR_RETURN_VALUE)
+      stream->error_flag = true;
+
+   return output;
+}
+
+int filestream_delete(const char *path)
+{
+   if (filestream_remove_cb)
+      return filestream_remove_cb(path);
+
+   return retro_vfs_file_remove_impl(path);
+}
+
+int filestream_rename(const char *old_path, const char *new_path)
+{
+   if (filestream_rename_cb)
+      return filestream_rename_cb(old_path, new_path);
+
+   return retro_vfs_file_rename_impl(old_path, new_path);
+}
+
+const char* filestream_get_path(RFILE *stream)
+{
+   if (filestream_get_path_cb)
+      return filestream_get_path_cb(stream->hfile);
+
+   return retro_vfs_file_get_path_impl(
+         (libretro_vfs_implementation_file*)stream->hfile);
+}
+
+int64_t filestream_write(RFILE *stream, const void *s, int64_t len)
+{
+   int64_t output;
+
+   if (filestream_write_cb)
+      output = filestream_write_cb(stream->hfile, s, len);
+   else
+      output = retro_vfs_file_write_impl(
+            (libretro_vfs_implementation_file*)stream->hfile, s, len);
+
+   if (output == VFS_ERROR_RETURN_VALUE)
+      stream->error_flag = true;
+
+   return output;
+}
+
+int filestream_putc(RFILE *stream, int c)
+{
+   char c_char = (char)c;
+   if (!stream)
+      return EOF;
+   return filestream_write(stream, &c_char, 1) == 1 
+      ? (int)(unsigned char)c 
+      : EOF;
+}
+
+int filestream_vprintf(RFILE *stream, const char* format, va_list args)
+{
+   static char buffer[8 * 1024];
+   int64_t num_chars = vsnprintf(buffer, sizeof(buffer),
+         format, args);
+
+   if (num_chars < 0)
+      return -1;
+   else if (num_chars == 0)
+      return 0;
+
+   return (int)filestream_write(stream, buffer, num_chars);
+}
+
+int filestream_printf(RFILE *stream, const char* format, ...)
+{
+   va_list vl;
+   int result;
+   va_start(vl, format);
+   result = filestream_vprintf(stream, format, vl);
+   va_end(vl);
+   return result;
+}
+
+int filestream_error(RFILE *stream)
+{
+   if (stream && stream->error_flag)
+      return 1;
+   return 0;
+}
+
+int filestream_close(RFILE *stream)
+{
+   int output;
+   struct retro_vfs_file_handle* fp = stream->hfile;
+
+   if (filestream_close_cb)
+      output = filestream_close_cb(fp);
+   else
+      output = retro_vfs_file_close_impl(
+            (libretro_vfs_implementation_file*)fp);
+
+   if (output == 0)
+      free(stream);
+
+   return output;
+}
+
+/**
+ * filestream_read_file:
+ * @path             : path to file.
+ * @buf              : buffer to allocate and read the contents of the
+ *                     file into. Needs to be freed manually.
+ * @len              : optional output integer containing bytes read.
+ *
+ * Read the contents of a file into @buf.
+ *
+ * Returns: non zero on success.
+ */
+int64_t filestream_read_file(const char *path, void **buf, int64_t *len)
+{
+   int64_t ret              = 0;
+   int64_t content_buf_size = 0;
+   void *content_buf        = NULL;
+   RFILE *file              = filestream_open(path,
+         RETRO_VFS_FILE_ACCESS_READ,
+         RETRO_VFS_FILE_ACCESS_HINT_NONE);
+
+   if (!file)
+   {
+      *buf = NULL;
+      return 0;
+   }
+
+   content_buf_size = filestream_get_size(file);
+
+   if (content_buf_size < 0)
+      goto error;
+
+   content_buf      = malloc((size_t)(content_buf_size + 1));
+
+   if (!content_buf)
+      goto error;
+   if ((int64_t)(uint64_t)(content_buf_size + 1) != (content_buf_size + 1))
+      goto error;
+
+   ret = filestream_read(file, content_buf, (int64_t)content_buf_size);
+   if (ret < 0)
+      goto error;
+
+   if (filestream_close(file) != 0)
+      if (file)
+         free(file);
+
+   *buf    = content_buf;
+
+   /* Allow for easy reading of strings to be safe.
+    * Will only work with sane character formatting (Unix). */
+   ((char*)content_buf)[ret] = '\0';
+
+   if (len)
+      *len = ret;
+
+   return 1;
+
+error:
+   if (file)
+      if (filestream_close(file) != 0)
+         free(file);
+   if (content_buf)
+      free(content_buf);
+   if (len)
+      *len = -1;
+   *buf = NULL;
+   return 0;
+}
+
+/**
+ * filestream_write_file:
+ * @path             : path to file.
+ * @data             : contents to write to the file.
+ * @size             : size of the contents.
+ *
+ * Writes data to a file.
+ *
+ * Returns: true (1) on success, false (0) otherwise.
+ */
+bool filestream_write_file(const char *path, const void *data, int64_t size)
+{
+   int64_t ret   = 0;
+   RFILE *file   = filestream_open(path,
+         RETRO_VFS_FILE_ACCESS_WRITE,
+         RETRO_VFS_FILE_ACCESS_HINT_NONE);
+   if (!file)
+      return false;
+
+   ret = filestream_write(file, data, size);
+   if (filestream_close(file) != 0)
+      if (file)
+         free(file);
+
+   if (ret != size)
+      return false;
+
+   return true;
+}
+
+/* Returned pointer must be freed by the caller. */
+char* filestream_getline(RFILE *stream)
+{
+   char *newline_tmp  = NULL;
+   size_t cur_size    = 8;
+   size_t idx         = 0;
+   int in             = 0;
+   char *newline      = (char*)malloc(9);
+
+   if (!stream || !newline)
+   {
+      if (newline)
+         free(newline);
+      return NULL;
+   }
+
+   in                 = filestream_getc(stream);
+
+   while (in != EOF && in != '\n')
+   {
+      if (idx == cur_size)
+      {
+         cur_size    *= 2;
+         newline_tmp  = (char*)realloc(newline, cur_size + 1);
+
+         if (!newline_tmp)
+         {
+            free(newline);
+            return NULL;
+         }
+
+         newline     = newline_tmp;
+      }
+
+      newline[idx++] = in;
+      in             = filestream_getc(stream);
+   }
+
+   newline[idx]      = '\0';
+   return newline;
+}
+
+libretro_vfs_implementation_file* filestream_get_vfs_handle(RFILE *stream)
+{
+   return (libretro_vfs_implementation_file*)stream->hfile;
+}
diff --git a/libretro-common/streams/file_stream_transforms.c b/libretro-common/streams/file_stream_transforms.c
new file mode 100644
index 0000000..099b27b
--- /dev/null
+++ b/libretro-common/streams/file_stream_transforms.c
@@ -0,0 +1,159 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+*
+* ---------------------------------------------------------------------------------------
+* The following license statement only applies to this file (file_stream_transforms.c).
+* ---------------------------------------------------------------------------------------
+*
+* Permission is hereby granted, free of charge,
+* to any person obtaining a copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <string.h>
+#include <stdarg.h>
+
+#include <libretro.h>
+#include <streams/file_stream.h>
+
+RFILE* rfopen(const char *path, const char *mode)
+{
+   RFILE          *output  = NULL;
+   unsigned int retro_mode = RETRO_VFS_FILE_ACCESS_READ;
+   bool position_to_end    = false;
+
+   if (strstr(mode, "r"))
+   {
+      retro_mode = RETRO_VFS_FILE_ACCESS_READ;
+      if (strstr(mode, "+"))
+      {
+         retro_mode = RETRO_VFS_FILE_ACCESS_READ_WRITE |
+            RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING;
+      }
+   }
+   else if (strstr(mode, "w"))
+   {
+      retro_mode = RETRO_VFS_FILE_ACCESS_WRITE;
+      if (strstr(mode, "+"))
+         retro_mode = RETRO_VFS_FILE_ACCESS_READ_WRITE;
+   }
+   else if (strstr(mode, "a"))
+   {
+      retro_mode = RETRO_VFS_FILE_ACCESS_WRITE |
+         RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING;
+      position_to_end = true;
+      if (strstr(mode, "+"))
+      {
+         retro_mode = RETRO_VFS_FILE_ACCESS_READ_WRITE |
+            RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING;
+      }
+   }
+
+   output = filestream_open(path, retro_mode,
+         RETRO_VFS_FILE_ACCESS_HINT_NONE);
+   if (output && position_to_end)
+      filestream_seek(output, 0, RETRO_VFS_SEEK_POSITION_END);
+
+   return output;
+}
+
+int rfclose(RFILE* stream)
+{
+   return filestream_close(stream);
+}
+
+int64_t rftell(RFILE* stream)
+{
+   return filestream_tell(stream);
+}
+
+int64_t rfseek(RFILE* stream, int64_t offset, int origin)
+{
+   int seek_position = -1;
+   switch (origin)
+   {
+      case SEEK_SET:
+         seek_position = RETRO_VFS_SEEK_POSITION_START;
+         break;
+      case SEEK_CUR:
+         seek_position = RETRO_VFS_SEEK_POSITION_CURRENT;
+         break;
+      case SEEK_END:
+         seek_position = RETRO_VFS_SEEK_POSITION_END;
+         break;
+   }
+
+   return filestream_seek(stream, offset, seek_position);
+}
+
+int64_t rfread(void* buffer,
+   size_t elem_size, size_t elem_count, RFILE* stream)
+{
+   return (filestream_read(stream, buffer, elem_size * elem_count) / elem_size);
+}
+
+char *rfgets(char *buffer, int maxCount, RFILE* stream)
+{
+   return filestream_gets(stream, buffer, maxCount);
+}
+
+int rfgetc(RFILE* stream)
+{
+   return filestream_getc(stream);
+}
+
+int64_t rfwrite(void const* buffer,
+   size_t elem_size, size_t elem_count, RFILE* stream)
+{
+   return filestream_write(stream, buffer, elem_size * elem_count);
+}
+
+int rfputc(int character, RFILE * stream)
+{
+    return filestream_putc(stream, character);
+}
+
+int64_t rfflush(RFILE * stream)
+{
+    return filestream_flush(stream);
+}
+
+int rfprintf(RFILE * stream, const char * format, ...)
+{
+   int result;
+   va_list vl;
+   va_start(vl, format);
+   result = filestream_vprintf(stream, format, vl);
+   va_end(vl);
+   return result;
+}
+
+int rferror(RFILE* stream)
+{
+   return filestream_error(stream);
+}
+
+int rfeof(RFILE* stream)
+{
+   return filestream_eof(stream);
+}
+
+int rfscanf(RFILE * stream, const char * format, ...)
+{
+   int result;
+   va_list vl;
+   va_start(vl, format);
+   result = filestream_scanf(stream, format, vl);
+   va_end(vl);
+   return result;
+}
diff --git a/libretro-common/string/stdstring.c b/libretro-common/string/stdstring.c
new file mode 100644
index 0000000..d637988
--- /dev/null
+++ b/libretro-common/string/stdstring.c
@@ -0,0 +1,536 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (stdstring.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <ctype.h>
+#include <string.h>
+
+#include <string/stdstring.h>
+#include <encodings/utf.h>
+
+const uint8_t lr_char_props[256] = {
+	/*x0   x1   x2   x3   x4   x5   x6   x7   x8   x9   xA   xB   xC   xD   xE   xF */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x80,0x00,0x00, /* 0x                  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 1x                  */
+	0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 2x  !"#$%&'()*+,-./ */
+	0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x41,0x00,0x00,0x00,0x00,0x00,0x00, /* 3x 0123456789:;<=>? */
+	0x00,0x23,0x23,0x23,0x23,0x23,0x23,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22, /* 4x @ABCDEFGHIJKLMNO */
+	0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x22,0x00,0x00,0x00,0x00,0x08, /* 5x PQRSTUVWXYZ[\]^_ */
+	0x00,0x25,0x25,0x25,0x25,0x25,0x25,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x24, /* 6x `abcdefghijklmno */
+	0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x00,0x00,0x00,0x00,0x00, /* 7x pqrstuvwxyz{|}~  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8x                  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 9x                  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Ax                  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Bx                  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Cx                  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Dx                  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Ex                  */
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Fx                  */
+};
+
+char *string_init(const char *src)
+{
+   return src ? strdup(src) : NULL;
+}
+
+void string_set(char **string, const char *src)
+{
+   free(*string);
+   *string = string_init(src);
+}
+
+
+char *string_to_upper(char *s)
+{
+   char *cs = (char *)s;
+   for ( ; *cs != '\0'; cs++)
+      *cs = toupper((unsigned char)*cs);
+   return s;
+}
+
+char *string_to_lower(char *s)
+{
+   char *cs = (char *)s;
+   for ( ; *cs != '\0'; cs++)
+      *cs = tolower((unsigned char)*cs);
+   return s;
+}
+
+char *string_ucwords(char *s)
+{
+   char *cs = (char *)s;
+   for ( ; *cs != '\0'; cs++)
+   {
+      if (*cs == ' ')
+         *(cs+1) = toupper((unsigned char)*(cs+1));
+   }
+
+   s[0] = toupper((unsigned char)s[0]);
+   return s;
+}
+
+char *string_replace_substring(const char *in,
+      const char *pattern, const char *replacement)
+{
+   size_t numhits, pattern_len, replacement_len, outlen;
+   const char *inat   = NULL;
+   const char *inprev = NULL;
+   char          *out = NULL;
+   char        *outat = NULL;
+
+   /* if either pattern or replacement is NULL,
+    * duplicate in and let caller handle it. */
+   if (!pattern || !replacement)
+      return strdup(in);
+
+   pattern_len     = strlen(pattern);
+   replacement_len = strlen(replacement);
+   numhits         = 0;
+   inat            = in;
+
+   while ((inat = strstr(inat, pattern)))
+   {
+      inat += pattern_len;
+      numhits++;
+   }
+
+   outlen          = strlen(in) - pattern_len*numhits + replacement_len*numhits;
+   out             = (char *)malloc(outlen+1);
+
+   if (!out)
+      return NULL;
+
+   outat           = out;
+   inat            = in;
+   inprev          = in;
+
+   while ((inat = strstr(inat, pattern)))
+   {
+      memcpy(outat, inprev, inat-inprev);
+      outat += inat-inprev;
+      memcpy(outat, replacement, replacement_len);
+      outat += replacement_len;
+      inat += pattern_len;
+      inprev = inat;
+   }
+   strcpy(outat, inprev);
+
+   return out;
+}
+
+/* Remove leading whitespaces */
+char *string_trim_whitespace_left(char *const s)
+{
+   if (s && *s)
+   {
+      size_t len     = strlen(s);
+      char *current  = s;
+
+      while (*current && ISSPACE((unsigned char)*current))
+      {
+         ++current;
+         --len;
+      }
+
+      if (s != current)
+         memmove(s, current, len + 1);
+   }
+
+   return s;
+}
+
+/* Remove trailing whitespaces */
+char *string_trim_whitespace_right(char *const s)
+{
+   if (s && *s)
+   {
+      size_t len     = strlen(s);
+      char  *current = s + len - 1;
+
+      while (current != s && ISSPACE((unsigned char)*current))
+      {
+         --current;
+         --len;
+      }
+
+      current[ISSPACE((unsigned char)*current) ? 0 : 1] = '\0';
+   }
+
+   return s;
+}
+
+/* Remove leading and trailing whitespaces */
+char *string_trim_whitespace(char *const s)
+{
+   string_trim_whitespace_right(s);  /* order matters */
+   string_trim_whitespace_left(s);
+
+   return s;
+}
+
+void word_wrap(char *dst, size_t dst_size, const char *src, int line_width, int wideglyph_width, unsigned max_lines)
+{
+   char *lastspace     = NULL;
+   unsigned counter    = 0;
+   unsigned lines      = 1;
+   size_t src_len      = strlen(src);
+   const char *src_end = src + src_len;
+
+   /* Prevent buffer overflow */
+   if (dst_size < src_len + 1)
+      return;
+
+   /* Early return if src string length is less
+    * than line width */
+   if (src_len < line_width)
+   {
+      strcpy(dst, src);
+      return;
+   }
+
+   while (*src != '\0')
+   {
+      unsigned char_len;
+
+      char_len = (unsigned)(utf8skip(src, 1) - src);
+      counter++;
+
+      if (*src == ' ')
+         lastspace = dst; /* Remember the location of the whitespace */
+      else if (*src == '\n')
+      {
+         /* If newlines embedded in the input,
+          * reset the index */
+         lines++;
+         counter = 0;
+
+         /* Early return if remaining src string
+          * length is less than line width */
+         if (src_end - src <= line_width)
+         {
+            strcpy(dst, src);
+            return;
+         }
+     }
+
+      while (char_len--)
+         *dst++ = *src++;
+
+      if (counter >= (unsigned)line_width)
+      {
+         counter = 0;
+
+         if (lastspace && (max_lines == 0 || lines < max_lines))
+         {
+            /* Replace nearest (previous) whitespace
+             * with newline character */
+            *lastspace = '\n';
+            lines++;
+
+            src -= dst - lastspace - 1;
+            dst = lastspace + 1;
+            lastspace  = NULL;
+
+            /* Early return if remaining src string
+             * length is less than line width */
+            if (src_end - src < line_width)
+            {
+               strcpy(dst, src);
+               return;
+            }
+         }
+      }
+   }
+
+   *dst = '\0';
+}
+
+void word_wrap_wideglyph(char *dst, size_t dst_size, const char *src, int line_width, int wideglyph_width, unsigned max_lines)
+{
+   char *lastspace                   = NULL;
+   char *lastwideglyph               = NULL;
+   const char *src_end               = src + strlen(src);
+   unsigned lines                    = 1;
+   /* 'line_width' means max numbers of characters per line,
+    * but this metric is only meaningful when dealing with
+    * 'regular' glyphs that have an on-screen pixel width
+    * similar to that of regular Latin characters.
+    * When handing so-called 'wide' Unicode glyphs, it is
+    * necessary to consider the actual on-screen pixel width
+    * of each character.
+    * In order to do this, we create a distinction between
+    * regular Latin 'non-wide' glyphs and 'wide' glyphs, and
+    * normalise all values relative to the on-screen pixel
+    * width of regular Latin characters:
+    * - Regular 'non-wide' glyphs have a normalised width of 100
+    * - 'line_width' is therefore normalised to 100 * (width_in_characters)
+    * - 'wide' glyphs have a normalised width of
+    *   100 * (wide_character_pixel_width / latin_character_pixel_width)
+    * - When a character is detected, the position in the current
+    *   line is incremented by the regular normalised width of 100
+    * - If that character is then determined to be a 'wide'
+    *   glyph, the position in the current line is further incremented
+    *   by the difference between the normalised 'wide' and 'non-wide'
+    *   width values */
+   unsigned counter_normalized       = 0;
+   int line_width_normalized         = line_width * 100;
+   int additional_counter_normalized = wideglyph_width - 100;
+ 
+   /* Early return if src string length is less
+    * than line width */
+   if (src_end - src < line_width)
+   {
+      strlcpy(dst, src, dst_size);
+      return;
+   }
+
+   while (*src != '\0')
+   {
+      unsigned char_len;
+
+      char_len = (unsigned)(utf8skip(src, 1) - src);
+      counter_normalized += 100;
+
+      /* Prevent buffer overflow */
+      if (char_len >= dst_size)
+         break;
+
+      if (*src == ' ')
+         lastspace = dst; /* Remember the location of the whitespace */
+      else if (*src == '\n')
+      {
+         /* If newlines embedded in the input,
+          * reset the index */
+         lines++;
+         counter_normalized = 0;
+
+         /* Early return if remaining src string
+          * length is less than line width */
+         if (src_end - src <= line_width)
+         {
+            strlcpy(dst, src, dst_size);
+            return;
+         }
+      }
+      else if (char_len >= 3)
+      {
+         /* Remember the location of the first byte
+          * whose length as UTF-8 >= 3*/
+         lastwideglyph = dst;
+         counter_normalized += additional_counter_normalized;
+      }
+
+      dst_size -= char_len;
+      while (char_len--)
+         *dst++ = *src++;
+
+      if (counter_normalized >= (unsigned)line_width_normalized)
+      {
+         counter_normalized = 0;
+
+         if (max_lines != 0 && lines >= max_lines)
+            continue;
+         else if (lastwideglyph && (!lastspace || lastwideglyph > lastspace))
+         {
+            /* Insert newline character */
+            *lastwideglyph = '\n';
+            lines++;
+            src -= dst - lastwideglyph;
+            dst = lastwideglyph + 1;
+            lastwideglyph = NULL;
+
+            /* Early return if remaining src string
+             * length is less than line width */
+            if (src_end - src <= line_width)
+            {
+               strlcpy(dst, src, dst_size);
+               return;
+            }
+         }
+         else if (lastspace)
+         {
+            /* Replace nearest (previous) whitespace
+             * with newline character */
+            *lastspace = '\n';
+            lines++;
+            src -= dst - lastspace - 1;
+            dst = lastspace + 1;
+            lastspace = NULL;
+
+            /* Early return if remaining src string
+             * length is less than line width */
+            if (src_end - src < line_width)
+            {
+               strlcpy(dst, src, dst_size);
+               return;
+            }
+         }
+      }
+   }
+
+   *dst = '\0';
+}
+
+/* Splits string into tokens seperated by 'delim'
+ * > Returned token string must be free()'d
+ * > Returns NULL if token is not found
+ * > After each call, 'str' is set to the position after the
+ *   last found token
+ * > Tokens *include* empty strings
+ * Usage example:
+ *    char *str      = "1,2,3,4,5,6,7,,,10,";
+ *    char **str_ptr = &str;
+ *    char *token    = NULL;
+ *    while ((token = string_tokenize(str_ptr, ",")))
+ *    {
+ *        printf("%s\n", token);
+ *        free(token);
+ *        token = NULL;
+ *    }
+ */
+char* string_tokenize(char **str, const char *delim)
+{
+   /* Taken from https://codereview.stackexchange.com/questions/216956/strtok-function-thread-safe-supports-empty-tokens-doesnt-change-string# */
+   char *str_ptr    = NULL;
+   char *delim_ptr  = NULL;
+   char *token      = NULL;
+   size_t token_len = 0;
+
+   /* Sanity checks */
+   if (!str || string_is_empty(delim))
+      return NULL;
+
+   str_ptr = *str;
+
+   /* Note: we don't check string_is_empty() here,
+    * empty strings are valid */
+   if (!str_ptr)
+      return NULL;
+
+   /* Search for delimiter */
+   delim_ptr = strstr(str_ptr, delim);
+
+   if (delim_ptr)
+      token_len = delim_ptr - str_ptr;
+   else
+      token_len = strlen(str_ptr);
+
+   /* Allocate token string */
+   token = (char *)malloc((token_len + 1) * sizeof(char));
+
+   if (!token)
+      return NULL;
+
+   /* Copy token */
+   strlcpy(token, str_ptr, (token_len + 1) * sizeof(char));
+   token[token_len] = '\0';
+
+   /* Update input string pointer */
+   *str = delim_ptr ? delim_ptr + strlen(delim) : NULL;
+
+   return token;
+}
+
+/* Removes every instance of character 'c' from 'str' */
+void string_remove_all_chars(char *str, char c)
+{
+   char *read_ptr  = NULL;
+   char *write_ptr = NULL;
+
+   if (string_is_empty(str))
+      return;
+
+   read_ptr  = str;
+   write_ptr = str;
+
+   while (*read_ptr != '\0')
+   {
+      *write_ptr = *read_ptr++;
+      write_ptr += (*write_ptr != c) ? 1 : 0;
+   }
+
+   *write_ptr = '\0';
+}
+
+/* Replaces every instance of character 'find' in 'str'
+ * with character 'replace' */
+void string_replace_all_chars(char *str, char find, char replace)
+{
+   char *str_ptr = str;
+
+   if (string_is_empty(str))
+      return;
+
+   while ((str_ptr = strchr(str_ptr, find)))
+      *str_ptr++ = replace;
+}
+
+/* Converts string to unsigned integer.
+ * Returns 0 if string is invalid  */
+unsigned string_to_unsigned(const char *str)
+{
+   const char *ptr = NULL;
+
+   if (string_is_empty(str))
+      return 0;
+
+   for (ptr = str; *ptr != '\0'; ptr++)
+   {
+      if (!ISDIGIT((unsigned char)*ptr))
+         return 0;
+   }
+
+   return (unsigned)strtoul(str, NULL, 10);
+}
+
+/* Converts hexadecimal string to unsigned integer.
+ * Handles optional leading '0x'.
+ * Returns 0 if string is invalid  */
+unsigned string_hex_to_unsigned(const char *str)
+{
+   const char *hex_str = str;
+   const char *ptr     = NULL;
+   size_t len;
+
+   if (string_is_empty(str))
+      return 0;
+
+   /* Remove leading '0x', if required */
+   len = strlen(str);
+
+   if (len >= 2)
+      if ((str[0] == '0') &&
+          ((str[1] == 'x') || (str[1] == 'X')))
+         hex_str = str + 2;
+
+   if (string_is_empty(hex_str))
+      return 0;
+
+   /* Check for valid characters */
+   for (ptr = hex_str; *ptr != '\0'; ptr++)
+   {
+      if (!isxdigit((unsigned char)*ptr))
+         return 0;
+   }
+
+   return (unsigned)strtoul(hex_str, NULL, 16);
+}
diff --git a/libretro-common/time/rtime.c b/libretro-common/time/rtime.c
new file mode 100644
index 0000000..d66c228
--- /dev/null
+++ b/libretro-common/time/rtime.c
@@ -0,0 +1,81 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (rtime.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifdef HAVE_THREADS
+#include <rthreads/rthreads.h>
+#include <retro_assert.h>
+#include <stdlib.h>
+#endif
+
+#include <string.h>
+#include <time/rtime.h>
+
+#ifdef HAVE_THREADS
+/* TODO/FIXME - global */
+slock_t *rtime_localtime_lock = NULL;
+#endif
+
+/* Must be called before using rtime_localtime() */
+void rtime_init(void)
+{
+   rtime_deinit();
+#ifdef HAVE_THREADS
+   if (!rtime_localtime_lock)
+      rtime_localtime_lock = slock_new();
+
+   retro_assert(rtime_localtime_lock);
+#endif
+}
+
+/* Must be called upon program termination */
+void rtime_deinit(void)
+{
+#ifdef HAVE_THREADS
+   if (rtime_localtime_lock)
+   {
+      slock_free(rtime_localtime_lock);
+      rtime_localtime_lock = NULL;
+   }
+#endif
+}
+
+/* Thread-safe wrapper for localtime() */
+struct tm *rtime_localtime(const time_t *timep, struct tm *result)
+{
+   struct tm *time_info = NULL;
+
+   /* Lock mutex */
+#ifdef HAVE_THREADS
+   slock_lock(rtime_localtime_lock);
+#endif
+
+   time_info = localtime(timep);
+   if (time_info)
+      memcpy(result, time_info, sizeof(struct tm));
+
+   /* Unlock mutex */
+#ifdef HAVE_THREADS
+   slock_unlock(rtime_localtime_lock);
+#endif
+
+   return result;
+}
diff --git a/libretro-common/vfs/vfs_implementation.c b/libretro-common/vfs/vfs_implementation.c
new file mode 100644
index 0000000..7a24a95
--- /dev/null
+++ b/libretro-common/vfs/vfs_implementation.c
@@ -0,0 +1,1335 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+*
+* ---------------------------------------------------------------------------------------
+* The following license statement only applies to this file (vfs_implementation.c).
+* ---------------------------------------------------------------------------------------
+*
+* Permission is hereby granted, free of charge,
+* to any person obtaining a copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#include <string/stdstring.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#if defined(_WIN32)
+#  ifdef _MSC_VER
+#    define setmode _setmode
+#  endif
+#include <sys/stat.h>
+#  ifdef _XBOX
+#    include <xtl.h>
+#    define INVALID_FILE_ATTRIBUTES -1
+#  else
+
+#    include <fcntl.h>
+#    include <direct.h>
+#    include <windows.h>
+#  endif
+#    include <io.h>
+#else
+#  if defined(PSP)
+#    include <pspiofilemgr.h>
+#  endif
+#  include <sys/types.h>
+#  include <sys/stat.h>
+#  if !defined(VITA)
+#  include <dirent.h>
+#  endif
+#  include <unistd.h>
+#  if defined(ORBIS)
+#  include <sys/fcntl.h>
+#  include <sys/dirent.h>
+#  include <orbisFile.h>
+#  endif
+#  if defined(WIIU)
+#  include <malloc.h>
+#  endif
+#endif
+
+#include <fcntl.h>
+
+/* TODO: Some things are duplicated but I'm really afraid of breaking other platforms by touching this */
+#if defined(VITA)
+#  include <psp2/io/fcntl.h>
+#  include <psp2/io/dirent.h>
+#  include <psp2/io/stat.h>
+#elif defined(ORBIS)
+#  include <orbisFile.h>
+#  include <ps4link.h>
+#  include <sys/dirent.h>
+#  include <sys/fcntl.h>
+#elif !defined(_WIN32)
+#  if defined(PSP)
+#    include <pspiofilemgr.h>
+#  endif
+#  include <sys/types.h>
+#  include <sys/stat.h>
+#  include <dirent.h>
+#  include <unistd.h>
+#endif
+
+#if defined(__QNX__) || defined(PSP)
+#include <unistd.h> /* stat() is defined here */
+#endif
+
+#ifdef __APPLE__
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+#ifdef __HAIKU__
+#include <kernel/image.h>
+#endif
+#ifndef __MACH__
+#include <compat/strl.h>
+#include <compat/posix_string.h>
+#endif
+#include <compat/strcasestr.h>
+#include <retro_miscellaneous.h>
+#include <encodings/utf.h>
+
+#if defined(_WIN32)
+#ifndef _XBOX
+#if defined(_MSC_VER) && _MSC_VER <= 1200
+#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
+#endif
+#endif
+#elif defined(VITA)
+#define SCE_ERROR_ERRNO_EEXIST 0x80010011
+#include <psp2/io/fcntl.h>
+#include <psp2/io/dirent.h>
+#include <psp2/io/stat.h>
+#else
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#endif
+
+#if defined(ORBIS)
+#include <orbisFile.h>
+#include <sys/fcntl.h>
+#include <sys/dirent.h>
+#endif
+#if defined(PSP)
+#include <pspkernel.h>
+#endif
+
+#if defined(__PS3__) || defined(__PSL1GHT__)
+#include <defines/ps3_defines.h>
+#if defined(__PSL1GHT__)
+#include <lv2/sysfs.h>
+#endif
+#endif
+
+#if defined(VITA)
+#define FIO_S_ISDIR SCE_S_ISDIR
+#endif
+
+#if defined(__QNX__) || defined(PSP)
+#include <unistd.h> /* stat() is defined here */
+#endif
+
+/* Assume W-functions do not work below Win2K and Xbox platforms */
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500 || defined(_XBOX)
+
+#ifndef LEGACY_WIN32
+#define LEGACY_WIN32
+#endif
+
+#endif
+
+#if defined(_WIN32)
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+#define ATLEAST_VC2005
+#endif
+#endif
+
+#include <vfs/vfs_implementation.h>
+#include <libretro.h>
+#if defined(HAVE_MMAP)
+#include <memmap.h>
+#endif
+#include <encodings/utf.h>
+#include <compat/fopen_utf8.h>
+#include <file/file_path.h>
+
+#ifdef HAVE_CDROM
+#include <vfs/vfs_implementation_cdrom.h>
+#endif
+
+#if (defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) >= 200112) || (defined(__POSIX_VISIBLE) && __POSIX_VISIBLE >= 200112) || (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112) || __USE_LARGEFILE || (defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64)
+#ifndef HAVE_64BIT_OFFSETS
+#define HAVE_64BIT_OFFSETS
+#endif
+#endif
+
+#define RFILE_HINT_UNBUFFERED (1 << 8)
+
+int64_t retro_vfs_file_seek_internal(
+      libretro_vfs_implementation_file *stream,
+      int64_t offset, int whence)
+{
+   if (!stream)
+      return -1;
+
+   if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
+   {
+#ifdef HAVE_CDROM
+      if (stream->scheme == VFS_SCHEME_CDROM)
+         return retro_vfs_file_seek_cdrom(stream, offset, whence);
+#endif
+#ifdef ATLEAST_VC2005
+      /* VC2005 and up have a special 64-bit fseek */
+      return _fseeki64(stream->fp, offset, whence);
+#elif defined(ORBIS)
+      {
+         int ret = orbisLseek(stream->fd, offset, whence);
+         if (ret < 0)
+            return -1;
+         return 0;
+      }
+#elif defined(HAVE_64BIT_OFFSETS)
+      return fseeko(stream->fp, (off_t)offset, whence);
+#else
+      return fseek(stream->fp, (long)offset, whence);
+#endif
+   }
+#ifdef HAVE_MMAP
+   /* Need to check stream->mapped because this function is
+    * called in filestream_open() */
+   if (stream->mapped && stream->hints &
+         RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
+   {
+      /* fseek() returns error on under/overflow but
+       * allows cursor > EOF for
+       read-only file descriptors. */
+      switch (whence)
+      {
+         case SEEK_SET:
+            if (offset < 0)
+               return -1;
+
+            stream->mappos = offset;
+            break;
+
+         case SEEK_CUR:
+            if (  (offset < 0 && stream->mappos + offset > stream->mappos) ||
+                  (offset > 0 && stream->mappos + offset < stream->mappos))
+               return -1;
+
+            stream->mappos += offset;
+            break;
+
+         case SEEK_END:
+            if (stream->mapsize + offset < stream->mapsize)
+               return -1;
+
+            stream->mappos = stream->mapsize + offset;
+            break;
+      }
+      return stream->mappos;
+   }
+#endif
+
+   if (lseek(stream->fd, (off_t)offset, whence) < 0)
+      return -1;
+
+   return 0;
+}
+
+/**
+ * retro_vfs_file_open_impl:
+ * @path               : path to file
+ * @mode               : file mode to use when opening (read/write)
+ * @hints              :
+ *
+ * Opens a file for reading or writing, depending on the requested mode.
+ * Returns a pointer to an RFILE if opened successfully, otherwise NULL.
+ **/
+
+libretro_vfs_implementation_file *retro_vfs_file_open_impl(
+      const char *path, unsigned mode, unsigned hints)
+{
+#if defined(VFS_FRONTEND) || defined(HAVE_CDROM)
+   int                             path_len = (int)strlen(path);
+#endif
+#ifdef VFS_FRONTEND
+   const char                 *dumb_prefix  = "vfsonly://";
+   size_t                   dumb_prefix_siz = STRLEN_CONST("vfsonly://");
+   int                      dumb_prefix_len = (int)dumb_prefix_siz;
+#endif
+#ifdef HAVE_CDROM
+   const char *cdrom_prefix                 = "cdrom://";
+   size_t cdrom_prefix_siz                  = STRLEN_CONST("cdrom://");
+   int cdrom_prefix_len                     = (int)cdrom_prefix_siz;
+#endif
+   int                                flags = 0;
+   const char                     *mode_str = NULL;
+   libretro_vfs_implementation_file *stream = 
+      (libretro_vfs_implementation_file*)
+      malloc(sizeof(*stream));
+
+   if (!stream)
+      return NULL;
+
+   stream->fd                     = 0;
+   stream->hints                  = hints;
+   stream->size                   = 0;
+   stream->buf                    = NULL;
+   stream->fp                     = NULL;
+#ifdef _WIN32
+   stream->fh                     = 0;
+#endif
+   stream->orig_path              = NULL;
+   stream->mappos                 = 0;
+   stream->mapsize                = 0;
+   stream->mapped                 = NULL;
+   stream->scheme                 = VFS_SCHEME_NONE;
+
+#ifdef VFS_FRONTEND
+   if (path_len >= dumb_prefix_len)
+      if (!memcmp(path, dumb_prefix, dumb_prefix_len))
+         path             += dumb_prefix_siz;
+#endif
+
+#ifdef HAVE_CDROM
+   stream->cdrom.cue_buf          = NULL;
+   stream->cdrom.cue_len          = 0;
+   stream->cdrom.byte_pos         = 0;
+   stream->cdrom.drive            = 0;
+   stream->cdrom.cur_min          = 0;
+   stream->cdrom.cur_sec          = 0;
+   stream->cdrom.cur_frame        = 0;
+   stream->cdrom.cur_track        = 0;
+   stream->cdrom.cur_lba          = 0;
+   stream->cdrom.last_frame_lba   = 0;
+   stream->cdrom.last_frame[0]    = '\0';
+   stream->cdrom.last_frame_valid = false;
+
+   if (path_len > cdrom_prefix_len)
+   {
+      if (!memcmp(path, cdrom_prefix, cdrom_prefix_len))
+      {
+         path             += cdrom_prefix_siz;
+         stream->scheme    = VFS_SCHEME_CDROM;
+      }
+   }
+#endif
+
+   stream->orig_path       = strdup(path);
+
+#ifdef HAVE_MMAP
+   if (stream->hints & RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS && mode == RETRO_VFS_FILE_ACCESS_READ)
+      stream->hints |= RFILE_HINT_UNBUFFERED;
+   else
+#endif
+      stream->hints &= ~RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS;
+
+   switch (mode)
+   {
+      case RETRO_VFS_FILE_ACCESS_READ:
+         mode_str = "rb";
+
+         flags    = O_RDONLY;
+#ifdef _WIN32
+         flags   |= O_BINARY;
+#endif
+         break;
+
+      case RETRO_VFS_FILE_ACCESS_WRITE:
+         mode_str = "wb";
+
+         flags    = O_WRONLY | O_CREAT | O_TRUNC;
+#if !defined(ORBIS)
+#if !defined(_WIN32)
+         flags   |= S_IRUSR | S_IWUSR;
+#else
+         flags   |= O_BINARY;
+#endif
+#endif
+         break;
+
+      case RETRO_VFS_FILE_ACCESS_READ_WRITE:
+         mode_str = "w+b";
+         flags    = O_RDWR | O_CREAT | O_TRUNC;
+#if !defined(ORBIS)
+#if !defined(_WIN32)
+         flags   |= S_IRUSR | S_IWUSR;
+#else
+         flags   |= O_BINARY;
+#endif
+#endif
+         break;
+
+      case RETRO_VFS_FILE_ACCESS_WRITE | RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING:
+      case RETRO_VFS_FILE_ACCESS_READ_WRITE | RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING:
+         mode_str = "r+b";
+
+         flags    = O_RDWR;
+#if !defined(ORBIS)
+#if !defined(_WIN32)
+         flags   |= S_IRUSR | S_IWUSR;
+#else
+         flags   |= O_BINARY;
+#endif
+#endif
+         break;
+
+      default:
+         goto error;
+   }
+
+   if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
+   {
+#ifdef ORBIS
+      int fd = orbisOpen(path, flags, 0644);
+      if (fd < 0)
+      {
+         stream->fd = -1;
+         goto error;
+      }
+      stream->fd    = fd;
+#else
+      FILE *fp;
+#ifdef HAVE_CDROM
+      if (stream->scheme == VFS_SCHEME_CDROM)
+      {
+         retro_vfs_file_open_cdrom(stream, path, mode, hints);
+#if defined(_WIN32) && !defined(_XBOX)
+         if (!stream->fh)
+            goto error;
+#else
+         if (!stream->fp)
+            goto error;
+#endif
+      }
+      else
+#endif
+      {
+         fp = (FILE*)fopen_utf8(path, mode_str);
+
+         if (!fp)
+            goto error;
+
+         stream->fp  = fp;
+      }
+      /* Regarding setvbuf:
+       *
+       * https://www.freebsd.org/cgi/man.cgi?query=setvbuf&apropos=0&sektion=0&manpath=FreeBSD+11.1-RELEASE&arch=default&format=html
+       *
+       * If the size argument is not zero but buf is NULL, 
+       * a buffer of the given size will be allocated immediately, and
+       * released on close. This is an extension to ANSI C.
+       *
+       * Since C89 does not support specifying a NULL buffer 
+       * with a non-zero size, we create and track our own buffer for it.
+       */
+      /* TODO: this is only useful for a few platforms, 
+       * find which and add ifdef */
+#if defined(_3DS)
+      if (stream->scheme != VFS_SCHEME_CDROM)
+      {
+         stream->buf = (char*)calloc(1, 0x10000);
+         if (stream->fp)
+            setvbuf(stream->fp, stream->buf, _IOFBF, 0x10000);
+      }
+#elif defined(WIIU)
+      if (stream->scheme != VFS_SCHEME_CDROM)
+      {
+         const int bufsize = 128*1024;
+         stream->buf = (char*)memalign(0x40, bufsize);
+         if (stream->fp)
+            setvbuf(stream->fp, stream->buf, _IOFBF, bufsize);
+      }
+#elif !defined(PSP)
+      if (stream->scheme != VFS_SCHEME_CDROM)
+      {
+         stream->buf = (char*)calloc(1, 0x4000);
+         if (stream->fp)
+            setvbuf(stream->fp, stream->buf, _IOFBF, 0x4000);
+      }
+#endif
+#endif
+   }
+   else
+   {
+#if defined(_WIN32) && !defined(_XBOX)
+#if defined(LEGACY_WIN32)
+      char *path_local    = utf8_to_local_string_alloc(path);
+      stream->fd          = open(path_local, flags, 0);
+      if (path_local)
+         free(path_local);
+#else
+      wchar_t * path_wide = utf8_to_utf16_string_alloc(path);
+      stream->fd          = _wopen(path_wide, flags, 0);
+      if (path_wide)
+         free(path_wide);
+#endif
+#else
+      stream->fd          = open(path, flags, 0);
+#endif
+
+      if (stream->fd == -1)
+         goto error;
+
+#ifdef HAVE_MMAP
+      if (stream->hints & RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
+      {
+         stream->mappos  = 0;
+         stream->mapped  = NULL;
+         stream->mapsize = retro_vfs_file_seek_internal(stream, 0, SEEK_END);
+
+         if (stream->mapsize == (uint64_t)-1)
+            goto error;
+
+         retro_vfs_file_seek_internal(stream, 0, SEEK_SET);
+
+         stream->mapped = (uint8_t*)mmap((void*)0,
+               stream->mapsize, PROT_READ,  MAP_SHARED, stream->fd, 0);
+
+         if (stream->mapped == MAP_FAILED)
+            stream->hints &= ~RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS;
+      }
+#endif
+   }
+#ifdef ORBIS
+   stream->size = orbisLseek(stream->fd, 0, SEEK_END);
+   orbisLseek(stream->fd, 0, SEEK_SET);
+#else
+#ifdef HAVE_CDROM
+   if (stream->scheme == VFS_SCHEME_CDROM)
+   {
+      retro_vfs_file_seek_cdrom(stream, 0, SEEK_SET);
+      retro_vfs_file_seek_cdrom(stream, 0, SEEK_END);
+
+      stream->size = retro_vfs_file_tell_impl(stream);
+
+      retro_vfs_file_seek_cdrom(stream, 0, SEEK_SET);
+   }
+   else
+#endif
+   {
+      retro_vfs_file_seek_internal(stream, 0, SEEK_SET);
+      retro_vfs_file_seek_internal(stream, 0, SEEK_END);
+
+      stream->size = retro_vfs_file_tell_impl(stream);
+
+      retro_vfs_file_seek_internal(stream, 0, SEEK_SET);
+   }
+#endif
+   return stream;
+
+error:
+   retro_vfs_file_close_impl(stream);
+   return NULL;
+}
+
+int retro_vfs_file_close_impl(libretro_vfs_implementation_file *stream)
+{
+   if (!stream)
+      return -1;
+
+#ifdef HAVE_CDROM
+   if (stream->scheme == VFS_SCHEME_CDROM)
+   {
+      retro_vfs_file_close_cdrom(stream);
+      goto end;
+   }
+#endif
+
+   if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
+   {
+      if (stream->fp)
+         fclose(stream->fp);
+   }
+   else
+   {
+#ifdef HAVE_MMAP
+      if (stream->hints & RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
+         munmap(stream->mapped, stream->mapsize);
+#endif
+   }
+
+   if (stream->fd > 0)
+   {
+#ifdef ORBIS
+      orbisClose(stream->fd);
+      stream->fd = -1;
+#else
+      close(stream->fd);
+#endif
+   }
+#ifdef HAVE_CDROM
+end:
+   if (stream->cdrom.cue_buf)
+      free(stream->cdrom.cue_buf);
+#endif
+   if (stream->buf)
+      free(stream->buf);
+
+   if (stream->orig_path)
+      free(stream->orig_path);
+
+   free(stream);
+
+   return 0;
+}
+
+int retro_vfs_file_error_impl(libretro_vfs_implementation_file *stream)
+{
+#ifdef HAVE_CDROM
+   if (stream->scheme == VFS_SCHEME_CDROM)
+      return retro_vfs_file_error_cdrom(stream);
+#endif
+#ifdef ORBIS
+   /* TODO/FIXME - implement this? */
+   return 0;
+#else
+   return ferror(stream->fp);
+#endif
+}
+
+int64_t retro_vfs_file_size_impl(libretro_vfs_implementation_file *stream)
+{
+   if (stream)
+      return stream->size;
+   return 0;
+}
+
+int64_t retro_vfs_file_truncate_impl(libretro_vfs_implementation_file *stream, int64_t length)
+{
+   if (!stream)
+      return -1;
+
+#ifdef _WIN32
+   if (_chsize(_fileno(stream->fp), length) != 0)
+      return -1;
+#elif !defined(VITA) && !defined(PSP) && !defined(PS2) && !defined(ORBIS) && (!defined(SWITCH) || defined(HAVE_LIBNX))
+   if (ftruncate(fileno(stream->fp), (off_t)length) != 0)
+      return -1;
+#endif
+
+   return 0;
+}
+
+int64_t retro_vfs_file_tell_impl(libretro_vfs_implementation_file *stream)
+{
+   if (!stream)
+      return -1;
+
+   if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
+   {
+#ifdef HAVE_CDROM
+      if (stream->scheme == VFS_SCHEME_CDROM)
+         return retro_vfs_file_tell_cdrom(stream);
+#endif
+#ifdef ORBIS
+      {
+         int64_t ret = orbisLseek(stream->fd, 0, SEEK_CUR);
+         if (ret < 0)
+            return -1;
+         return ret;
+      }
+#else
+#ifdef ATLEAST_VC2005
+      /* VC2005 and up have a special 64-bit ftell */
+      return _ftelli64(stream->fp);
+#elif defined(HAVE_64BIT_OFFSETS)
+      return ftello(stream->fp);
+#else
+      return ftell(stream->fp);
+#endif
+#endif
+   }
+#ifdef HAVE_MMAP
+   /* Need to check stream->mapped because this function
+    * is called in filestream_open() */
+   if (stream->mapped && stream->hints & 
+         RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
+      return stream->mappos;
+#endif
+   if (lseek(stream->fd, 0, SEEK_CUR) < 0)
+      return -1;
+
+   return 0;
+}
+
+int64_t retro_vfs_file_seek_impl(libretro_vfs_implementation_file *stream,
+      int64_t offset, int seek_position)
+{
+   int whence = -1;
+   switch (seek_position)
+   {
+      case RETRO_VFS_SEEK_POSITION_START:
+         whence = SEEK_SET;
+         break;
+      case RETRO_VFS_SEEK_POSITION_CURRENT:
+         whence = SEEK_CUR;
+         break;
+      case RETRO_VFS_SEEK_POSITION_END:
+         whence = SEEK_END;
+         break;
+   }
+
+   return retro_vfs_file_seek_internal(stream, offset, whence);
+}
+
+int64_t retro_vfs_file_read_impl(libretro_vfs_implementation_file *stream,
+      void *s, uint64_t len)
+{
+   if (!stream || !s)
+      return -1;
+
+   if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
+   {
+#ifdef HAVE_CDROM
+      if (stream->scheme == VFS_SCHEME_CDROM)
+         return retro_vfs_file_read_cdrom(stream, s, len);
+#endif
+#ifdef ORBIS
+      if (orbisRead(stream->fd, s, (size_t)len) < 0)
+         return -1;
+      return 0;
+#else
+      return fread(s, 1, (size_t)len, stream->fp);
+#endif
+   }
+#ifdef HAVE_MMAP
+   if (stream->hints & RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
+   {
+      if (stream->mappos > stream->mapsize)
+         return -1;
+
+      if (stream->mappos + len > stream->mapsize)
+         len = stream->mapsize - stream->mappos;
+
+      memcpy(s, &stream->mapped[stream->mappos], len);
+      stream->mappos += len;
+
+      return len;
+   }
+#endif
+
+   return read(stream->fd, s, (size_t)len);
+}
+
+int64_t retro_vfs_file_write_impl(libretro_vfs_implementation_file *stream, const void *s, uint64_t len)
+{
+   if (!stream)
+      return -1;
+
+   if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
+   {
+#ifdef ORBIS
+      if (orbisWrite(stream->fd, s, (size_t)len) < 0)
+         return -1;
+      return 0;
+#else
+      return fwrite(s, 1, (size_t)len, stream->fp);
+#endif
+   }
+
+#ifdef HAVE_MMAP
+   if (stream->hints & RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS)
+      return -1;
+#endif
+   return write(stream->fd, s, (size_t)len);
+}
+
+int retro_vfs_file_flush_impl(libretro_vfs_implementation_file *stream)
+{
+   if (!stream)
+      return -1;
+#ifdef ORBIS
+   return 0;
+#else
+   return fflush(stream->fp) == 0 ? 0 : -1;
+#endif
+}
+
+int retro_vfs_file_remove_impl(const char *path)
+{
+#if defined(_WIN32) && !defined(_XBOX)
+   /* Win32 (no Xbox) */
+
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500
+   char *path_local    = NULL;
+#else
+   wchar_t *path_wide  = NULL;
+#endif
+   if (!path || !*path)
+      return -1;
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500
+   path_local = utf8_to_local_string_alloc(path);
+
+   if (path_local)
+   {
+      int ret = remove(path_local);
+      free(path_local);
+
+      if (ret == 0)
+         return 0;
+   }
+#else
+   path_wide = utf8_to_utf16_string_alloc(path);
+
+   if (path_wide)
+   {
+      int ret = _wremove(path_wide);
+      free(path_wide);
+
+      if (ret == 0)
+         return 0;
+   }
+#endif
+   return -1;
+#elif defined(ORBIS)
+   /* Orbis
+    * TODO/FIXME - stub for now */
+   return 0;
+#else
+   if (remove(path) == 0)
+      return 0;
+   return -1;
+#endif
+}
+
+int retro_vfs_file_rename_impl(const char *old_path, const char *new_path)
+{
+#if defined(_WIN32) && !defined(_XBOX)
+   /* Win32 (no Xbox) */
+   int ret                 = -1;
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500
+   char *old_path_local    = NULL;
+#else
+   wchar_t *old_path_wide  = NULL;
+#endif
+
+   if (!old_path || !*old_path || !new_path || !*new_path)
+      return -1;
+
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0500
+   old_path_local = utf8_to_local_string_alloc(old_path);
+
+   if (old_path_local)
+   {
+      char *new_path_local = utf8_to_local_string_alloc(new_path);
+
+      if (new_path_local)
+      {
+         if (rename(old_path_local, new_path_local) == 0)
+            ret = 0;
+         free(new_path_local);
+      }
+
+      free(old_path_local);
+   }
+#else
+   old_path_wide = utf8_to_utf16_string_alloc(old_path);
+
+   if (old_path_wide)
+   {
+      wchar_t *new_path_wide = utf8_to_utf16_string_alloc(new_path);
+
+      if (new_path_wide)
+      {
+         if (_wrename(old_path_wide, new_path_wide) == 0)
+            ret = 0;
+         free(new_path_wide);
+      }
+
+      free(old_path_wide);
+   }
+#endif
+   return ret;
+
+#elif defined(ORBIS)
+   /* Orbis */
+   /* TODO/FIXME - Stub for now */
+   if (!old_path || !*old_path || !new_path || !*new_path)
+      return -1;
+   return 0;
+
+#else
+   /* Every other platform */
+   if (!old_path || !*old_path || !new_path || !*new_path)
+      return -1;
+   return rename(old_path, new_path) == 0 ? 0 : -1;
+#endif
+}
+
+const char *retro_vfs_file_get_path_impl(
+      libretro_vfs_implementation_file *stream)
+{
+   /* should never happen, do something noisy so caller can be fixed */
+   if (!stream)
+      abort();
+   return stream->orig_path;
+}
+
+int retro_vfs_stat_impl(const char *path, int32_t *size)
+{
+   bool is_dir               = false;
+   bool is_character_special = false;
+#if defined(VITA) || defined(PSP)
+   /* Vita / PSP */
+   SceIoStat buf;
+   int dir_ret;
+   char *tmp                 = NULL;
+   size_t len                = 0;
+
+   if (!path || !*path)
+      return 0;
+
+   tmp                       = strdup(path);
+   len                       = strlen(tmp);
+   if (tmp[len-1] == '/')
+      tmp[len-1] = '\0';
+
+   dir_ret                   = sceIoGetstat(tmp, &buf);
+   free(tmp);
+   if (dir_ret < 0)
+      return 0;
+
+   if (size)
+      *size                  = (int32_t)buf.st_size;
+
+   is_dir                    = FIO_S_ISDIR(buf.st_mode);
+#elif defined(ORBIS)
+   /* Orbis */
+   int dir_ret               = 0;
+
+   if (!path || !*path)
+      return 0;
+
+   if (size)
+      *size                  = (int32_t)buf.st_size;
+
+   dir_ret                   = orbisDopen(path);
+   is_dir                    = dir_ret > 0;
+   orbisDclose(dir_ret);
+
+   is_character_special      = S_ISCHR(buf.st_mode);
+#elif defined(__PSL1GHT__) || defined(__PS3__)
+   /* Lowlevel Lv2 */
+   sysFSStat buf;
+
+   if (!path || !*path)
+      return 0;
+   if (sysFsStat(path, &buf) < 0)
+      return 0;
+
+   if (size)
+      *size                  = (int32_t)buf.st_size;
+
+   is_dir                    = ((buf.st_mode & S_IFMT) == S_IFDIR);
+#elif defined(_WIN32)
+   /* Windows */
+   DWORD file_info;
+   struct _stat buf;
+#if defined(LEGACY_WIN32)
+   char *path_local          = NULL;
+#else
+   wchar_t *path_wide        = NULL;
+#endif
+
+   if (!path || !*path)
+      return 0;
+
+#if defined(LEGACY_WIN32)
+   path_local                = utf8_to_local_string_alloc(path);
+   file_info                 = GetFileAttributes(path_local);
+
+   if (!string_is_empty(path_local))
+      _stat(path_local, &buf);
+
+   if (path_local)
+      free(path_local);
+#else
+   path_wide                 = utf8_to_utf16_string_alloc(path);
+   file_info                 = GetFileAttributesW(path_wide);
+
+   _wstat(path_wide, &buf);
+
+   if (path_wide)
+      free(path_wide);
+#endif
+
+   if (file_info == INVALID_FILE_ATTRIBUTES)
+      return 0;
+
+   if (size)
+      *size = (int32_t)buf.st_size;
+
+   is_dir = (file_info & FILE_ATTRIBUTE_DIRECTORY);
+
+#elif defined(GEKKO)
+   /* On GEKKO platforms, paths cannot have
+    * trailing slashes - we must therefore
+    * remove them */
+   char *path_buf = NULL;
+   int stat_ret   = -1;
+   struct stat stat_buf;
+   size_t len;
+
+   if (string_is_empty(path))
+      return 0;
+
+   path_buf = strdup(path);
+   if (!path_buf)
+      return 0;
+
+   len = strlen(path_buf);
+   if (len > 0)
+      if (path_buf[len - 1] == '/')
+         path_buf[len - 1] = '\0';
+
+   stat_ret = stat(path_buf, &stat_buf);
+   free(path_buf);
+
+   if (stat_ret < 0)
+      return 0;
+
+   if (size)
+      *size             = (int32_t)stat_buf.st_size;
+
+   is_dir               = S_ISDIR(stat_buf.st_mode);
+   is_character_special = S_ISCHR(stat_buf.st_mode);
+
+#else
+   /* Every other platform */
+   struct stat buf;
+
+   if (!path || !*path)
+      return 0;
+   if (stat(path, &buf) < 0)
+      return 0;
+
+   if (size)
+      *size             = (int32_t)buf.st_size;
+
+   is_dir               = S_ISDIR(buf.st_mode);
+   is_character_special = S_ISCHR(buf.st_mode);
+#endif
+   return RETRO_VFS_STAT_IS_VALID | (is_dir ? RETRO_VFS_STAT_IS_DIRECTORY : 0) | (is_character_special ? RETRO_VFS_STAT_IS_CHARACTER_SPECIAL : 0);
+}
+
+#if defined(VITA)
+#define path_mkdir_error(ret) (((ret) == SCE_ERROR_ERRNO_EEXIST))
+#elif defined(PSP) || defined(PS2) || defined(_3DS) || defined(WIIU) || defined(SWITCH) || defined(ORBIS)
+#define path_mkdir_error(ret) ((ret) == -1)
+#else
+#define path_mkdir_error(ret) ((ret) < 0 && errno == EEXIST)
+#endif
+
+int retro_vfs_mkdir_impl(const char *dir)
+{
+#if defined(_WIN32)
+#ifdef LEGACY_WIN32
+   int ret        = _mkdir(dir);
+#else
+   wchar_t *dir_w = utf8_to_utf16_string_alloc(dir);
+   int       ret  = -1;
+
+   if (dir_w)
+   {
+      ret = _wmkdir(dir_w);
+      free(dir_w);
+   }
+#endif
+#elif defined(IOS)
+   int ret = mkdir(dir, 0755);
+#elif defined(VITA) || defined(PSP)
+   int ret = sceIoMkdir(dir, 0777);
+#elif defined(ORBIS)
+   int ret = orbisMkdir(dir, 0755);
+#elif defined(__QNX__)
+   int ret = mkdir(dir, 0777);
+#elif defined(GEKKO)
+   /* On GEKKO platforms, mkdir() fails if
+    * the path has a trailing slash. We must
+    * therefore remove it. */
+   int ret = -1;
+   if (!string_is_empty(dir))
+   {
+      char *dir_buf = strdup(dir);
+
+      if (dir_buf)
+      {
+         size_t len = strlen(dir_buf);
+
+         if (len > 0)
+            if (dir_buf[len - 1] == '/')
+               dir_buf[len - 1] = '\0';
+
+         ret = mkdir(dir_buf, 0750);
+
+         free(dir_buf);
+      }
+   }
+#else
+   int ret = mkdir(dir, 0750);
+#endif
+
+   if (path_mkdir_error(ret))
+      return -2;
+   return ret < 0 ? -1 : 0;
+}
+
+#ifdef VFS_FRONTEND
+struct retro_vfs_dir_handle
+#else
+struct libretro_vfs_implementation_dir
+#endif
+{
+   char* orig_path;
+#if defined(_WIN32)
+#if defined(LEGACY_WIN32)
+   WIN32_FIND_DATA entry;
+#else
+   WIN32_FIND_DATAW entry;
+#endif
+   HANDLE directory;
+   bool next;
+   char path[PATH_MAX_LENGTH];
+#elif defined(VITA) || defined(PSP)
+   SceUID directory;
+   SceIoDirent entry;
+#elif defined(__PSL1GHT__) || defined(__PS3__)
+   int error;
+   int directory;
+   sysFSDirent entry;
+#elif defined(ORBIS)
+   int directory;
+   struct dirent entry;
+#else
+   DIR *directory;
+   const struct dirent *entry;
+#endif
+};
+
+static bool dirent_check_error(libretro_vfs_implementation_dir *rdir)
+{
+#if defined(_WIN32)
+   return (rdir->directory == INVALID_HANDLE_VALUE);
+#elif defined(VITA) || defined(PSP) || defined(ORBIS)
+   return (rdir->directory < 0);
+#elif defined(__PSL1GHT__) || defined(__PS3__)
+   return (rdir->error != FS_SUCCEEDED);
+#else
+   return !(rdir->directory);
+#endif
+}
+
+libretro_vfs_implementation_dir *retro_vfs_opendir_impl(
+      const char *name, bool include_hidden)
+{
+#if defined(_WIN32)
+   unsigned path_len;
+   char path_buf[1024];
+   size_t copied      = 0;
+#if defined(LEGACY_WIN32)
+   char *path_local   = NULL;
+#else
+   wchar_t *path_wide = NULL;
+#endif
+#endif
+   libretro_vfs_implementation_dir *rdir;
+
+   /*Reject null or empty string paths*/
+   if (!name || (*name == 0))
+      return NULL;
+
+   /*Allocate RDIR struct. Tidied later with retro_closedir*/
+   rdir = (libretro_vfs_implementation_dir*)calloc(1, sizeof(*rdir));
+   if (!rdir)
+      return NULL;
+
+   rdir->orig_path       = strdup(name);
+
+#if defined(_WIN32)
+   path_buf[0]           = '\0';
+   path_len              = strlen(name);
+
+   copied                = strlcpy(path_buf, name, sizeof(path_buf));
+
+   /* Non-NT platforms don't like extra slashes in the path */
+   if (name[path_len - 1] != '\\')
+      path_buf[copied++]   = '\\';
+
+   path_buf[copied]        = '*';
+   path_buf[copied+1]      = '\0';
+
+#if defined(LEGACY_WIN32)
+   path_local              = utf8_to_local_string_alloc(path_buf);
+   rdir->directory         = FindFirstFile(path_local, &rdir->entry);
+
+   if (path_local)
+      free(path_local);
+#else
+   path_wide               = utf8_to_utf16_string_alloc(path_buf);
+   rdir->directory         = FindFirstFileW(path_wide, &rdir->entry);
+
+   if (path_wide)
+      free(path_wide);
+#endif
+
+#elif defined(VITA) || defined(PSP)
+   rdir->directory       = sceIoDopen(name);
+#elif defined(_3DS)
+   rdir->directory       = !string_is_empty(name) ? opendir(name) : NULL;
+   rdir->entry           = NULL;
+#elif defined(__PSL1GHT__) || defined(__PS3__)
+   rdir->error           = sysFsOpendir(name, &rdir->directory);
+#elif defined(ORBIS)
+   rdir->directory       = orbisDopen(name);
+#else
+   rdir->directory       = opendir(name);
+   rdir->entry           = NULL;
+#endif
+
+#ifdef _WIN32
+   if (include_hidden)
+      rdir->entry.dwFileAttributes |= FILE_ATTRIBUTE_HIDDEN;
+   else
+      rdir->entry.dwFileAttributes &= ~FILE_ATTRIBUTE_HIDDEN;
+#endif
+
+   if (rdir->directory && !dirent_check_error(rdir))
+      return rdir;
+
+   retro_vfs_closedir_impl(rdir);
+   return NULL;
+}
+
+bool retro_vfs_readdir_impl(libretro_vfs_implementation_dir *rdir)
+{
+#if defined(_WIN32)
+   if (rdir->next)
+#if defined(LEGACY_WIN32)
+      return (FindNextFile(rdir->directory, &rdir->entry) != 0);
+#else
+      return (FindNextFileW(rdir->directory, &rdir->entry) != 0);
+#endif
+
+   rdir->next = true;
+   return (rdir->directory != INVALID_HANDLE_VALUE);
+#elif defined(VITA) || defined(PSP)
+   return (sceIoDread(rdir->directory, &rdir->entry) > 0);
+#elif defined(__PSL1GHT__) || defined(__PS3__)
+   uint64_t nread;
+   rdir->error = sysFsReaddir(rdir->directory, &rdir->entry, &nread);
+   return (nread != 0);
+#elif defined(ORBIS)
+   return (orbisDread(rdir->directory, &rdir->entry) > 0);
+#else
+   return ((rdir->entry = readdir(rdir->directory)) != NULL);
+#endif
+}
+
+const char *retro_vfs_dirent_get_name_impl(libretro_vfs_implementation_dir *rdir)
+{
+#if defined(_WIN32)
+#if defined(LEGACY_WIN32)
+   char *name       = local_to_utf8_string_alloc(rdir->entry.cFileName);
+#else
+   char *name       = utf16_to_utf8_string_alloc(rdir->entry.cFileName);
+#endif
+   memset(rdir->entry.cFileName, 0, sizeof(rdir->entry.cFileName));
+   strlcpy((char*)rdir->entry.cFileName, name, sizeof(rdir->entry.cFileName));
+   if (name)
+      free(name);
+   return (char*)rdir->entry.cFileName;
+#elif defined(VITA) || defined(PSP) || defined(ORBIS) || defined(__PSL1GHT__) || defined(__PS3__)
+   return rdir->entry.d_name;
+#else
+   if (!rdir || !rdir->entry)
+      return NULL;
+   return rdir->entry->d_name;
+#endif
+}
+
+bool retro_vfs_dirent_is_dir_impl(libretro_vfs_implementation_dir *rdir)
+{
+#if defined(_WIN32)
+   const WIN32_FIND_DATA *entry = (const WIN32_FIND_DATA*)&rdir->entry;
+   return entry->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
+#elif defined(PSP) || defined(VITA)
+   const SceIoDirent *entry     = (const SceIoDirent*)&rdir->entry;
+#if defined(PSP)
+   return (entry->d_stat.st_attr & FIO_SO_IFDIR) == FIO_SO_IFDIR;
+#elif defined(VITA)
+   return SCE_S_ISDIR(entry->d_stat.st_mode);
+#endif
+#elif defined(__PSL1GHT__) || defined(__PS3__)
+   sysFSDirent *entry          = (sysFSDirent*)&rdir->entry;
+   return (entry->d_type == FS_TYPE_DIR);
+#elif defined(ORBIS)
+   const struct dirent *entry   = &rdir->entry;
+   if (entry->d_type == DT_DIR)
+      return true;
+   if (!(entry->d_type == DT_UNKNOWN || entry->d_type == DT_LNK))
+      return false;
+#else
+   struct stat buf;
+   char path[PATH_MAX_LENGTH];
+#if defined(DT_DIR)
+   const struct dirent *entry = (const struct dirent*)rdir->entry;
+   if (entry->d_type == DT_DIR)
+      return true;
+   /* This can happen on certain file systems. */
+   if (!(entry->d_type == DT_UNKNOWN || entry->d_type == DT_LNK))
+      return false;
+#endif
+   /* dirent struct doesn't have d_type, do it the slow way ... */
+   path[0] = '\0';
+   fill_pathname_join(path, rdir->orig_path, retro_vfs_dirent_get_name_impl(rdir), sizeof(path));
+   if (stat(path, &buf) < 0)
+      return false;
+   return S_ISDIR(buf.st_mode);
+#endif
+}
+
+int retro_vfs_closedir_impl(libretro_vfs_implementation_dir *rdir)
+{
+   if (!rdir)
+      return -1;
+
+#if defined(_WIN32)
+   if (rdir->directory != INVALID_HANDLE_VALUE)
+      FindClose(rdir->directory);
+#elif defined(VITA) || defined(PSP)
+   sceIoDclose(rdir->directory);
+#elif defined(__PSL1GHT__) || defined(__PS3__)
+   rdir->error = sysFsClosedir(rdir->directory);
+#elif defined(ORBIS)
+   orbisDclose(rdir->directory);
+#else
+   if (rdir->directory)
+      closedir(rdir->directory);
+#endif
+
+   if (rdir->orig_path)
+      free(rdir->orig_path);
+   free(rdir);
+   return 0;
+}
diff --git a/libretro.c b/libretro.c
index 9b4599e..8b05b44 100644
--- a/libretro.c
+++ b/libretro.c
@@ -22,6 +22,10 @@
 #include <libretro.h>
 #include <retro_miscellaneous.h>
 
+#ifndef LOAD_FROM_MEMORY
+#include <streams/file_stream.h>
+#endif
+
 #include "libretro_core_options.h"
 
 #ifdef _3DS
@@ -92,6 +96,9 @@ static bool update_audio_latency           = false;
 void retro_set_environment(retro_environment_t cb)
 {
    struct retro_log_callback log;
+#ifndef LOAD_FROM_MEMORY
+   struct retro_vfs_interface_info vfs_iface_info;
+#endif
    environ_cb = cb;
 
    if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
@@ -103,6 +110,13 @@ void retro_set_environment(retro_environment_t cb)
    libretro_set_core_options(environ_cb,
 		   &libretro_supports_option_categories);
    environ_cb(RETRO_ENVIRONMENT_GET_PERF_INTERFACE, &perf_cb);
+
+#ifndef LOAD_FROM_MEMORY
+   vfs_iface_info.required_interface_version = 1;
+   vfs_iface_info.iface                      = NULL;
+   if (environ_cb(RETRO_ENVIRONMENT_GET_VFS_INTERFACE, &vfs_iface_info))
+      filestream_vfs_init(&vfs_iface_info);
+#endif
 }
 
 void retro_set_video_refresh(retro_video_refresh_t cb)
diff --git a/source/memmap.c b/source/memmap.c
index 850bb15..d7986e1 100644
--- a/source/memmap.c
+++ b/source/memmap.c
@@ -7,6 +7,10 @@
 #endif
 #include <ctype.h>
 
+#ifndef LOAD_FROM_MEMORY
+#include <streams/file_stream.h>
+#endif
+
 #include "snes9x.h"
 #include "memmap.h"
 #include "cpuexec.h"
@@ -411,12 +415,12 @@ static void _splitpath (const char* path,
 }
 
 /* Read variable size MSB int from a file */
-static int32_t ReadInt(FILE* f, uint32_t nbytes)
+static int32_t ReadInt(RFILE* f, uint32_t nbytes)
 {
    int32_t v = 0;
    while (nbytes--)
    {
-      int32_t c = fgetc(f);
+      int32_t c = filestream_getc(f);
       if (c == EOF)
          return -1;
       v = (v << 8) | (c & 0xFF);
@@ -443,19 +447,28 @@ static void CheckForIPSPatch(const char* rom_filename, bool header, int32_t* rom
    char  name [_MAX_FNAME + 1];
    char  ext [_MAX_EXT + 1];
    char  fname [_MAX_PATH + 1];
-   FILE*  patch_file  = NULL;
+   RFILE *patch_file = NULL;
    int32_t offset = header ? 512 : 0;
 
    _splitpath(rom_filename, dir, name, ext);
    _makepath(fname, dir, name, "ips");
 
-   if (!(patch_file = fopen(fname, "rb")))
-      if (!(patch_file = fopen(S9xGetFilename("ips"), "rb")))
+   patch_file = filestream_open(fname, RETRO_VFS_FILE_ACCESS_READ,
+         RETRO_VFS_FILE_ACCESS_HINT_NONE);
+
+   if (!patch_file)
+   {
+      patch_file = filestream_open(S9xGetFilename("ips"),
+            RETRO_VFS_FILE_ACCESS_READ, RETRO_VFS_FILE_ACCESS_HINT_NONE);
+
+      if (!patch_file)
          return;
+   }
 
-   if (fread(fname, 1, 5, patch_file) != 5 || strncmp(fname, "PATCH", 5) != 0)
+   if (filestream_read(patch_file, fname, 5) != 5 ||
+       strncmp(fname, "PATCH", 5) != 0)
    {
-      fclose(patch_file);
+      filestream_close(patch_file);
       return;
    }
 
@@ -488,7 +501,7 @@ static void CheckForIPSPatch(const char* rom_filename, bool header, int32_t* rom
 
          while (len--)
          {
-            rchar = fgetc(patch_file);
+            rchar = filestream_getc(patch_file);
             if (rchar == EOF)
                goto err_eof;
             Memory.ROM [ofs++] = (uint8_t) rchar;
@@ -502,7 +515,7 @@ static void CheckForIPSPatch(const char* rom_filename, bool header, int32_t* rom
          if (rlen == -1)
             goto err_eof;
 
-         rchar = fgetc(patch_file);
+         rchar = filestream_getc(patch_file);
          if (rchar == EOF)
             goto err_eof;
 
@@ -521,17 +534,17 @@ static void CheckForIPSPatch(const char* rom_filename, bool header, int32_t* rom
    ofs = ReadInt(patch_file, 3);
    if (ofs != -1 && ofs - offset < *rom_size)
       *rom_size = ofs - offset; /* Need to truncate ROM image */
-   fclose(patch_file);
+   filestream_close(patch_file);
    return;
 
 err_eof:
    if (patch_file)
-      fclose(patch_file);
+      filestream_close(patch_file);
 }
 
 static uint32_t FileLoader(uint8_t* buffer, const char* filename, int32_t maxsize)
 {
-   FILE* ROMFile;
+   RFILE* ROMFile = NULL;
    int32_t len = 0;
 
    char dir [_MAX_DIR + 1];
@@ -549,7 +562,10 @@ static uint32_t FileLoader(uint8_t* buffer, const char* filename, int32_t maxsiz
    memmove(&ext [0], &ext[1], 4);
 #endif
 
-   if ((ROMFile = fopen(fname, "rb")) == NULL)
+   ROMFile = filestream_open(fname, RETRO_VFS_FILE_ACCESS_READ,
+         RETRO_VFS_FILE_ACCESS_HINT_NONE);
+
+   if (!ROMFile)
       return 0;
 
    Memory.HeaderCount = 0;
@@ -557,8 +573,8 @@ static uint32_t FileLoader(uint8_t* buffer, const char* filename, int32_t maxsiz
 
    {
       int32_t calc_size;
-      FileSize = fread(ptr, 1, maxsize + 0x200 - (ptr - Memory.ROM), ROMFile);
-      fclose(ROMFile);
+      FileSize = filestream_read(ROMFile, ptr, maxsize + 0x200 - (ptr - Memory.ROM));
+      filestream_close(ROMFile);
       calc_size = FileSize & ~0x1FFF; /* round to the lower 0x2000 */
 
       if ((FileSize - calc_size == 512 && !Settings.ForceNoHeader) 
-- 
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