From fea026fec4f6c528ef325c1ea8a38eaf0089f9ed Mon Sep 17 00:00:00 2001
From: negativeExponent
Date: Sun, 5 Apr 2020 14:21:40 +0800
Subject: Fix cheevos support

---
 libretro.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/libretro.c b/libretro.c
index 6018d87..3aacfec 100644
--- a/libretro.c
+++ b/libretro.c
@@ -514,6 +514,27 @@ static void frame_time_cb(retro_usec_t usec)
    frame_time = usec / 1000000.0;
 }
 
+static void set_memory_descriptors(void)
+{
+   const uint64_t mem = RETRO_MEMORY_SYSTEM_RAM;
+   struct retro_memory_descriptor desc[9] = {
+      { mem, iwram, 0x00000 + 0x8000, 0x3000000, 0, 0, 0x8000, NULL },
+      { mem, ewram, 0x00000 + 0x8000, 0x2000000, 0, 0, 0x8000, NULL },
+      { mem, ewram, 0x10000 + 0x8000, 0x2008000, 0, 0, 0x8000, NULL },
+      { mem, ewram, 0x20000 + 0x8000, 0x2010000, 0, 0, 0x8000, NULL },
+      { mem, ewram, 0x30000 + 0x8000, 0x2018000, 0, 0, 0x8000, NULL },
+      { mem, ewram, 0x40000 + 0x8000, 0x2020000, 0, 0, 0x8000, NULL },
+      { mem, ewram, 0x50000 + 0x8000, 0x2028000, 0, 0, 0x8000, NULL },
+      { mem, ewram, 0x60000 + 0x8000, 0x2030000, 0, 0, 0x8000, NULL },
+      { mem, ewram, 0x70000 + 0x8000, 0x2038000, 0, 0, 0x8000, NULL }
+   };
+   struct retro_memory_map retromap = {
+      desc,
+      sizeof(desc) / sizeof(desc[0])
+   };
+   environ_cb(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &retromap);
+}
+
 bool retro_load_game(const struct retro_game_info* info)
 {
    if (!info)
@@ -604,6 +625,8 @@ bool retro_load_game(const struct retro_game_info* info)
 
    init_context_switch();
 
+   set_memory_descriptors();
+
    return true;
 }
 
-- 
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