Add sprite limit hack.

2 files changed, 17 insertions, 2 deletions

diff --git a/libretro.c b/libretro.c
index 42e316d..c5895c6 100644
--- a/libretro.c
+++ b/libretro.c
@@ -37,6 +37,7 @@ struct retro_perf_callback perf_cb;
 char retro_save_directory[PATH_MAX];
 char retro_base_name[PATH_MAX];
 bool overclock_cycles = false;
+bool reduce_sprite_flicker = false;
 
 #ifdef _WIN32
    char slash = '\\';
@@ -296,6 +297,7 @@ void retro_init(void)
    {
       { "catsfc_VideoMode", "Video Mode; auto|NTSC|PAL" },
       { "catsfc_overclock_cycles", "CPU Overclock (Hack, Unsafe, Restart); disabled|enabled" },
+      { "catsfc_reduce_sprite_flicker", "Reduce Flickering (Hack, Unsafe); disabled|enabled" },
       { NULL, NULL },
    };
 
@@ -391,6 +393,17 @@ static void check_variables(void)
         else
           overclock_cycles = false;
       }
+
+   var.key = "catsfc_reduce_sprite_flicker";
+   var.value = NULL;
+
+   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
+      {
+        if (strcmp(var.value, "enabled") == 0)
+          reduce_sprite_flicker = true;
+        else
+          reduce_sprite_flicker = false;
+      }
 }
 
 #ifdef PSP
diff --git a/source/gfx.c b/source/gfx.c
index 6dd9ff5..1b9928d 100644
--- a/source/gfx.c
+++ b/source/gfx.c
@@ -36,6 +36,8 @@ extern SLineMatrixData LineMatrixData [240];
 
 extern uint8_t  Mode7Depths [2];
 
+extern bool reduce_sprite_flicker;
+
 #define CLIP_10_BIT_SIGNED(a) \
    ((a) & ((1 << 10) - 1)) + (((((a) & (1 << 13)) ^ (1 << 13)) - (1 << 13)) >> 3)
 
@@ -611,7 +613,7 @@ void S9xSetupOBJ(void)
       for (i = 0; i < SNES_HEIGHT_EXTENDED; i++)
       {
          GFX.OBJLines[i].RTOFlags = 0;
-         GFX.OBJLines[i].Tiles = 34;
+         GFX.OBJLines[i].Tiles = (reduce_sprite_flicker ? 60 : 34);
       }
       FirstSprite = PPU.FirstSprite;
       S = FirstSprite;
@@ -733,7 +735,7 @@ void S9xSetupOBJ(void)
       for (Y = 0; Y < SNES_HEIGHT_EXTENDED; Y++)
       {
          GFX.OBJLines[Y].RTOFlags = Y ? GFX.OBJLines[Y - 1].RTOFlags : 0;
-         GFX.OBJLines[Y].Tiles = 34;
+         GFX.OBJLines[Y].Tiles = (reduce_sprite_flicker ? 60 : 34);
          j = 0;
          if (AnyOBJOnLine[Y])
          {