mirror of https://github.com/mgba-emu/mgba.git
GB Timer: Batch timer updates as needed
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@ -29,12 +29,11 @@ int32_t GBTimerProcessEvents(struct GBTimer* timer, int32_t cycles) {
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timer->irqPending = false;
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timer->nextEvent += timer->nextDiv;
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}
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if (timer->nextDiv <= 0) {
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while (timer->nextDiv <= 0) {
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if ((timer->internalDiv & 15) == 15) {
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++timer->p->memory.io[REG_DIV];
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}
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timer->nextDiv += GB_DMG_DIV_PERIOD;
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timer->nextEvent += GB_DMG_DIV_PERIOD;
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// Make sure to trigger when the correct bit is a falling edge
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if (timer->timaPeriod > 0 && (timer->internalDiv & (timer->timaPeriod - 1)) == timer->timaPeriod - 1) {
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@ -46,6 +45,18 @@ int32_t GBTimerProcessEvents(struct GBTimer* timer, int32_t cycles) {
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}
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++timer->internalDiv;
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}
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if (timer->nextEvent <= 0) {
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// Batch div increments
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int divsToGo = 16 - (timer->internalDiv & 15);
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int timaToGo = INT_MAX;
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if (timer->timaPeriod) {
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timaToGo = timer->timaPeriod - (timer->internalDiv & (timer->timaPeriod - 1));
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}
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if (timaToGo < divsToGo) {
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divsToGo = timaToGo;
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}
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timer->nextEvent += GB_DMG_DIV_PERIOD * divsToGo;
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}
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timer->eventDiff = 0;
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}
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return timer->nextEvent;
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