Add overclock and sprite limit options.

gfx.cpp

@@ -827,7 +827,7 @@ static void SetupOBJ (void)
 		for (int i = 0; i < SNES_HEIGHT_EXTENDED; i++)
 		{
 			GFX.OBJLines[i].RTOFlags = 0;
-			GFX.OBJLines[i].Tiles = 34;
+			GFX.OBJLines[i].Tiles = Settings.MaxSpriteTilesPerLine;
 			for (int j = 0; j < 32; j++)
 				GFX.OBJLines[i].OBJ[j].Sprite = -1;
 		}
@@ -959,7 +959,7 @@ static void SetupOBJ (void)
 		for (int 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 = Settings.MaxSpriteTilesPerLine;
 
 			uint8	FirstSprite = (PPU.FirstSprite + Y) & 0x7f;
 			S = FirstSprite;

libretro/Makefile

@@ -479,7 +479,7 @@ else
 endif
 
 CXXFLAGS	+= $(CODE_DEFINES) $(WARNINGS_DEFINES) $(fpic)
-CXXFLAGS	+= -DRIGHTSHIFT_IS_SAR -D__LIBRETRO__
+CXXFLAGS	+= -DRIGHTSHIFT_IS_SAR -D__LIBRETRO__ -DALLOW_CPU_OVERCLOCK
 CFLAGS		= $(CXXFLAGS)
 
 ifeq (,$(findstring msvc,$(platform)))

libretro/libretro.cpp

@@ -168,6 +168,8 @@ void retro_set_environment(retro_environment_t cb)
         // Adding more variables and rearranging them is safe.
         { "snes9x_up_down_allowed", "Allow Opposing Directions; disabled|enabled" },
         { "snes9x_overclock_superfx", "SuperFX Overclocking; 100%|150%|200%|250%|300%|350%|400%|450%|500%|50%" },
+        { "snes9x_overclock_cycles", "Reduce Slowdown (Hack, Unsafe); disabled|compatible|max" },
+        { "snes9x_reduce_sprite_flicker", "Reduce Flickering (Hack, Unsafe); disabled|enabled" },
         { "snes9x_hires_blend", "Hires Blending; disabled|enabled" },
         { "snes9x_audio_interpolation", "Audio Interpolation; gaussian|cubic|sinc|none|linear" },
         { "snes9x_layer_1", "Show layer 1; enabled|disabled" },
@@ -332,6 +334,36 @@ static void update_variables(void)
     else
         Settings.InterpolationMethod = DSP_INTERPOLATION_GAUSSIAN;
 
+
+    Settings.OneClockCycle      = 6;
+    Settings.OneSlowClockCycle  = 8;
+    Settings.TwoClockCycles     = 12;
+
+    var.key="snes9x_overclock_cycles";
+    var.value=NULL;
+    if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
+    {
+        if (strcmp(var.value, "max") == 0)
+        {
+            Settings.OneClockCycle      = 3;
+            Settings.OneSlowClockCycle  = 3;
+            Settings.TwoClockCycles     = 3;
+        }
+        else if (strcmp(var.value, "compatible"))
+        {
+            Settings.OneClockCycle      = 4;
+            Settings.OneSlowClockCycle  = 5;
+            Settings.TwoClockCycles     = 6;
+        }
+    }
+
+    Settings.MaxSpriteTilesPerLine = 34;
+    var.key="snes9x_overclock_cycles";
+    var.value=NULL;
+    if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
+        if (strcmp(var.value, "enabled") == 0)
+            Settings.MaxSpriteTilesPerLine = 60;
+
     var.key = "snes9x_overscan";
 
     if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)

snes9x.cpp

@@ -497,6 +497,7 @@ void S9xLoadConfigFiles (char **argv, int argc)
 	Settings.DisableGameSpecificHacks       = !conf.GetBool("Hack::EnableGameSpecificHacks",       true);
 	Settings.BlockInvalidVRAMAccessMaster   = !conf.GetBool("Hack::AllowInvalidVRAMAccess",        false);
 	Settings.HDMATimingHack                 =  conf.GetInt ("Hack::HDMATiming",                    100);
+	Settings.MaxSpriteTilesPerLine          =  conf.GetInt ("Hack::MaxSpriteTilesPerLine",         34);
 
 	// Netplay
 

snes9x.h

@@ -254,9 +254,15 @@
 #define SNES_MAX_PAL_VCOUNTER		312
 #define SNES_HCOUNTER_MAX			341
 
+#ifndef ALLOW_CPU_OVERCLOCK
 #define ONE_CYCLE					6
 #define SLOW_ONE_CYCLE				8
 #define TWO_CYCLES					12
+#else
+#define ONE_CYCLE      (Settings.OneClockCycle)
+#define SLOW_ONE_CYCLE (Settings.OneSlowClockCycle)
+#define TWO_CYCLES     (Settings.TwoClockCycles)
+#endif
 #define	ONE_DOT_CYCLE				4
 
 #define SNES_CYCLES_PER_SCANLINE	(SNES_HCOUNTER_MAX * ONE_DOT_CYCLE)
@@ -480,7 +486,12 @@ struct SSettings
 	bool8	UpAndDown;
 
 	bool8	OpenGLEnable;
+
 	uint32	SuperFXClockMultiplier;
+	int	OneClockCycle;
+	int	OneSlowClockCycle;
+	int	TwoClockCycles;
+	int	MaxSpriteTilesPerLine;
 };
 
 struct SSNESGameFixes