From c9099d020a1e523d97541f426f7d44da1392526f Mon Sep 17 00:00:00 2001
From: notaz
Date: Sun, 18 Nov 2012 00:31:30 +0200
Subject: frontend: overlay improvements

work directly on psx vram
---
 plugins/gpulib/cspace.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)

(limited to 'plugins/gpulib/cspace.c')

diff --git a/plugins/gpulib/cspace.c b/plugins/gpulib/cspace.c
index 1d5718c..8e3bee9 100644
--- a/plugins/gpulib/cspace.c
+++ b/plugins/gpulib/cspace.c
@@ -1,3 +1,13 @@
+/*
+ * (C) Gražvydas "notaz" Ignotas, 2011,2012
+ *
+ * This work is licensed under the terms of any of these licenses
+ * (at your option):
+ *  - GNU GPL, version 2 or later.
+ *  - GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
 #include "cspace.h"
 
 /*
@@ -5,6 +15,8 @@
  * in favor of NEON version or platform-specific conversion
  */
 
+#ifndef __ARM_NEON__
+
 void bgr555_to_rgb565(void *dst_, const void *src_, int bytes)
 {
 	const unsigned int *src = src_;
@@ -42,3 +54,92 @@ void bgr888_to_rgb565(void *dst_, const void *src_, int bytes)
 void rgb888_to_rgb565(void *dst, const void *src, int bytes) {}
 void bgr888_to_rgb888(void *dst, const void *src, int bytes) {}
 
+#endif // __ARM_NEON__
+
+/* YUV stuff */
+static int yuv_ry[32], yuv_gy[32], yuv_by[32];
+static unsigned char yuv_u[32 * 2], yuv_v[32 * 2];
+
+void bgr_to_uyvy_init(void)
+{
+  int i, v;
+
+  /* init yuv converter:
+    y0 = (int)((0.299f * r0) + (0.587f * g0) + (0.114f * b0));
+    y1 = (int)((0.299f * r1) + (0.587f * g1) + (0.114f * b1));
+    u = (int)(8 * 0.565f * (b0 - y0)) + 128;
+    v = (int)(8 * 0.713f * (r0 - y0)) + 128;
+  */
+  for (i = 0; i < 32; i++) {
+    yuv_ry[i] = (int)(0.299f * i * 65536.0f + 0.5f);
+    yuv_gy[i] = (int)(0.587f * i * 65536.0f + 0.5f);
+    yuv_by[i] = (int)(0.114f * i * 65536.0f + 0.5f);
+  }
+  for (i = -32; i < 32; i++) {
+    v = (int)(8 * 0.565f * i) + 128;
+    if (v < 0)
+      v = 0;
+    if (v > 255)
+      v = 255;
+    yuv_u[i + 32] = v;
+    v = (int)(8 * 0.713f * i) + 128;
+    if (v < 0)
+      v = 0;
+    if (v > 255)
+      v = 255;
+    yuv_v[i + 32] = v;
+  }
+}
+
+void bgr555_to_uyvy(void *d, const void *s, int pixels)
+{
+  unsigned int *dst = d;
+  const unsigned short *src = s;
+  const unsigned char *yu = yuv_u + 32;
+  const unsigned char *yv = yuv_v + 32;
+  int r0, g0, b0, r1, g1, b1;
+  int y0, y1, u, v;
+
+  for (; pixels > 0; src += 2, dst++, pixels -= 2)
+  {
+    b0 = (src[0] >> 10) & 0x1f;
+    g0 = (src[0] >> 5) & 0x1f;
+    r0 =  src[0] & 0x1f;
+    b1 = (src[1] >> 10) & 0x1f;
+    g1 = (src[1] >> 5) & 0x1f;
+    r1 =  src[1] & 0x1f;
+    y0 = (yuv_ry[r0] + yuv_gy[g0] + yuv_by[b0]) >> 16;
+    y1 = (yuv_ry[r1] + yuv_gy[g1] + yuv_by[b1]) >> 16;
+    u = yu[b0 - y0];
+    v = yv[r0 - y0];
+    // valid Y range seems to be 16..235
+    y0 = 16 + 219 * y0 / 31;
+    y1 = 16 + 219 * y1 / 31;
+
+    *dst = (y1 << 24) | (v << 16) | (y0 << 8) | u;
+  }
+}
+
+void bgr888_to_uyvy(void *d, const void *s, int pixels)
+{
+  unsigned int *dst = d;
+  const unsigned char *src8 = s;
+  const unsigned char *yu = yuv_u + 32;
+  const unsigned char *yv = yuv_v + 32;
+  int r0, g0, b0, r1, g1, b1;
+  int y0, y1, u, v;
+
+  for (; pixels > 0; src8 += 3*2, dst++, pixels -= 2)
+  {
+    r0 = src8[0], g0 = src8[1], b0 = src8[2];
+    r1 = src8[3], g1 = src8[4], b1 = src8[5];
+    y0 = (r0 * 19595 + g0 * 38470 + b0 * 7471) >> 16;
+    y1 = (r1 * 19595 + g1 * 38470 + b1 * 7471) >> 16;
+    u = yu[(b0 - y0) / 8];
+    v = yv[(r0 - y0) / 8];
+    y0 = 16 + 219 * y0 / 255;
+    y1 = 16 + 219 * y1 / 255;
+
+    *dst = (y1 << 24) | (v << 16) | (y0 << 8) | u;
+  }
+}
-- 
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