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Fix SuperFX2 Core Speed (#852)

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Commit "Snes9x - SFX: Make SFX2 1/3 faster than 1.59.2." fixes the SuperFX2 speed for Yoshi's Island but it broke the speed for other SuperFX2 games.

This hack will correct that.
This commit is contained in:
bladeoner 2019-06-01 16:33:09 +02:00 committed by dborth
parent 9b3636bbfe
commit 43e3b79937
3 changed files with 16 additions and 2 deletions
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4
source/snes9x/fxemu.cpp
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@ -148,7 +148,9 @@ void S9xSuperFXExec (void)
{
if ((Memory.FillRAM[0x3000 + GSU_SFR] & FLG_G) && (Memory.FillRAM[0x3000 + GSU_SCMR] & 0x18) == 0x18)
{
FxEmulate(((Memory.FillRAM[0x3000 + GSU_CLSR] & 1) ? (SuperFX.speedPerLine * 8 / 3) : SuperFX.speedPerLine) * Settings.SuperFXClockMultiplier / 100);
#ifdef GEKKO
FxEmulate(((Memory.FillRAM[0x3000 + GSU_CLSR] & 1) ? (SuperFX.speedPerLine * Timings.SuperFX2CoreSpeed) : SuperFX.speedPerLine) * Settings.SuperFXClockMultiplier / 100);
#endif
uint16 GSUStatus = Memory.FillRAM[0x3000 + GSU_SFR] | (Memory.FillRAM[0x3000 + GSU_SFR + 1] << 8);
if ((GSUStatus & (FLG_G | FLG_IRQ)) == FLG_IRQ)

11
source/snes9x/memmap.cpp
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@ -3723,7 +3723,16 @@ void CMemory::ApplyROMFixes (void)
Timings.HDMAStart = SNES_HDMA_START_HC + Settings.HDMATimingHack - 100;
Timings.HBlankStart = SNES_HBLANK_START_HC + Timings.HDMAStart - SNES_HDMA_START_HC;
Timings.IRQTriggerCycles = 14;
#ifdef GEKKO
if (match_id("YI ")) { // Super Mario World 2 - Yoshi's Island
Timings.SuperFX2CoreSpeed = 8 / 3;
}
else {
Timings.SuperFX2CoreSpeed = 5 / 2;
}
#endif
if (!Settings.DisableGameSpecificHacks)
{
// The delay to sync CPU and DMA which Snes9x cannot emulate.

3
source/snes9x/snes9x.h
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@ -181,6 +181,9 @@ struct STimings
int32 IRQFlagChanging; // This value is just a hack.
int32 APUSpeedup;
bool8 APUAllowTimeOverflow;
#ifdef GEKKO
int32 SuperFX2CoreSpeed; // Make the SuperFX2 Core Speed adjustable
#endif
};
struct SSettings