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snes9x
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Fix IRQ edge cases

This commit is contained in:
OV2 2012-06-02 17:30:35 +02:00
parent ea09fef2b9
commit 0c74e2c437
1 changed files with 5 additions and 4 deletions
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9
cpuexec.h
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@ -278,10 +278,11 @@ static inline void S9xCheckInterrupts (void)
if (CPU.IRQLine && thisIRQ) if (CPU.IRQLine && thisIRQ)
CPU.IRQTransition = TRUE; CPU.IRQTransition = TRUE;
if (PPU.HTimerEnabled) int32 htimepos = PPU.HTimerEnabled ? PPU.HTimerPosition : 10;
if (thisIRQ)
{ {
int32 htimepos = PPU.HTimerPosition; if (CPU.Cycles >= Timings.H_Max && htimepos < CPU.PrevCycles)
if (CPU.Cycles >= Timings.H_Max)
htimepos += Timings.H_Max; htimepos += Timings.H_Max;
if (CPU.PrevCycles >= htimepos || CPU.Cycles < htimepos) if (CPU.PrevCycles >= htimepos || CPU.Cycles < htimepos)
@ -291,7 +292,7 @@ static inline void S9xCheckInterrupts (void)
if (PPU.VTimerEnabled) if (PPU.VTimerEnabled)
{ {
int32 vcounter = CPU.V_Counter; int32 vcounter = CPU.V_Counter;
if (CPU.Cycles >= Timings.H_Max) if (htimepos >= Timings.H_Max)
vcounter++; vcounter++;
if (vcounter != PPU.VTimerPosition) if (vcounter != PPU.VTimerPosition)