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GB Serialize: Fix timing bug loading channel 4 timing

This commit is contained in:
Vicki Pfau 2020-02-01 12:17:45 -08:00
parent 034d4bd43a
commit af59e28f90
2 changed files with 7 additions and 2 deletions
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1
CHANGES
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@ -2,6 +2,7 @@
Emulation fixes:
- ARM: Fix ALU reading PC after shifting
- ARM: Fix STR storing PC after address calculation
- GB Serialize: Fix timing bug loading channel 4 timing
- GBA DMA: Linger last DMA on bus (fixes mgba.io/i/301 and mgba.io/i/1320)
- GBA Memory: Misaligned SRAM writes are ignored
- GBA Memory: Improve gamepak prefetch timing

8
src/gb/audio.c
View File

@ -1078,9 +1078,13 @@ void GBAudioPSGDeserialize(struct GBAudio* audio, const struct GBSerializedPSGSt
LOAD_32LE(audio->ch4.lastEvent, 0, &state->ch4.lastEvent);
LOAD_32LE(when, 0, &state->ch4.nextEvent);
if (audio->ch4.envelope.dead < 2 && audio->playingCh4) {
if (when - audio->ch4.lastEvent > (uint32_t) audio->sampleInterval) {
if (!audio->ch4.lastEvent) {
// Back-compat: fake this value
audio->ch4.lastEvent = when - audio->sampleInterval;
uint32_t currentTime = mTimingCurrentTime(audio->timing);
int32_t cycles = audio->ch4.ratio ? 2 * audio->ch4.ratio : 1;
cycles <<= audio->ch4.frequency;
cycles *= 8 * audio->timingFactor;
audio->ch4.lastEvent = currentTime + (when & (cycles - 1)) - cycles;
}
mTimingSchedule(audio->timing, &audio->ch4Event, when);
}