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GB: Improve stepping timing accuracy

This commit is contained in:
Vicki Pfau 2017-11-13 23:27:05 -08:00
parent 5d9e4d217a
commit 60a2f49cda
1 changed files with 5 additions and 5 deletions
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10
src/lr35902/lr35902.c
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@ -137,22 +137,22 @@ static void _LR35902Step(struct LR35902Core* cpu) {
}
void LR35902Tick(struct LR35902Core* cpu) {
if (cpu->cycles >= cpu->nextEvent) {
cpu->irqh.processEvents(cpu);
}
_LR35902Step(cpu);
if (cpu->cycles + 2 >= cpu->nextEvent) {
int32_t diff = cpu->nextEvent - cpu->cycles;
cpu->cycles = cpu->nextEvent;
cpu->executionState += diff;
cpu->irqh.processEvents(cpu);
cpu->cycles += 2 - diff;
cpu->cycles += LR35902_CORE_EXECUTE - cpu->executionState;
} else {
cpu->cycles += 2;
}
cpu->executionState = LR35902_CORE_FETCH;
cpu->instruction(cpu);
++cpu->cycles;
if (cpu->cycles >= cpu->nextEvent) {
cpu->irqh.processEvents(cpu);
}
}
void LR35902Run(struct LR35902Core* cpu) {
@ -168,7 +168,7 @@ void LR35902Run(struct LR35902Core* cpu) {
cpu->cycles = cpu->nextEvent;
cpu->executionState += diff;
cpu->irqh.processEvents(cpu);
cpu->cycles += 2 - diff;
cpu->cycles += LR35902_CORE_EXECUTE - cpu->executionState;
running = false;
} else {
cpu->cycles += 2;