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Backport Only allow instantaneous IRQ when toggling IRQ completely

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bladeoner 2019-01-19 08:43:22 +01:00 committed by GitHub
parent 1d2e9c8836
commit 6d45274416
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1 changed files with 7 additions and 1 deletions
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source/snes9x/ppu.cpp
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@ -1382,7 +1382,13 @@ void S9xSetCPU (uint8 Byte, uint16 Address)
} }
if ((Byte & 0x30) != (Memory.FillRAM[0x4200] & 0x30)) if ((Byte & 0x30) != (Memory.FillRAM[0x4200] & 0x30))
{
// Only allow instantaneous IRQ if turning it completely on or off
if ((Byte & 0x30) == 0 || (Memory.FillRAM[0x4200] & 0x30) == 0)
S9xUpdateIRQPositions(true); S9xUpdateIRQPositions(true);
else
S9xUpdateIRQPositions(false);
}
// NMI can trigger immediately during VBlank as long as NMI_read ($4210) wasn't cleard. // NMI can trigger immediately during VBlank as long as NMI_read ($4210) wasn't cleard.
if ((Byte & 0x80) && !(Memory.FillRAM[0x4200] & 0x80) && if ((Byte & 0x80) && !(Memory.FillRAM[0x4200] & 0x80) &&