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GBA DMA: Only update DMA scheduling if needed

This commit is contained in:
Vicki Pfau 2020-08-21 02:41:03 -07:00
parent 5c58186f03
commit 7df5b67a71
1 changed files with 10 additions and 2 deletions
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8
src/gba/dma.c
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@ -134,29 +134,37 @@ void GBADMASchedule(struct GBA* gba, int number, struct GBADMA* info) {
void GBADMARunHblank(struct GBA* gba, int32_t cycles) {
struct GBAMemory* memory = &gba->memory;
struct GBADMA* dma;
bool found = false;
int i;
for (i = 0; i < 4; ++i) {
dma = &memory->dma[i];
if (GBADMARegisterIsEnable(dma->reg) && GBADMARegisterGetTiming(dma->reg) == GBA_DMA_TIMING_HBLANK && !dma->nextCount) {
dma->when = mTimingCurrentTime(&gba->timing) + 3 + cycles;
dma->nextCount = dma->count;
found = true;
}
}
if (found) {
GBADMAUpdate(gba);
}
}
void GBADMARunVblank(struct GBA* gba, int32_t cycles) {
struct GBAMemory* memory = &gba->memory;
struct GBADMA* dma;
bool found = false;
int i;
for (i = 0; i < 4; ++i) {
dma = &memory->dma[i];
if (GBADMARegisterIsEnable(dma->reg) && GBADMARegisterGetTiming(dma->reg) == GBA_DMA_TIMING_VBLANK && !dma->nextCount) {
dma->when = mTimingCurrentTime(&gba->timing) + 3 + cycles;
dma->nextCount = dma->count;
found = true;
}
}
if (found) {
GBADMAUpdate(gba);
}
}
void GBADMARunDisplayStart(struct GBA* gba, int32_t cycles) {