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GB Audio: Fix some channel 4 timing edge cases

This commit is contained in:
Vicki Pfau 2021-03-15 20:45:21 -07:00
parent 47728c7a8d
commit 3ca82b64af
2 changed files with 8 additions and 4 deletions
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1
CHANGES
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@ -29,6 +29,7 @@ Emulation fixes:
- GB: Downgrade DMG-only ROMs from CGB mode even without boot ROM
- GB: Fix marking BIOS as unmapped when skipping BIOS (fixes mgba.io/i/2061)
- GB Audio: Fix serializing sweep time
- GB Audio: Fix some channel 4 timing edge cases
- GB MBC: Fix MBC1 mode changing behavior
- GB MBC: Fix some MBC3 bit masking
- GB Video: Fix state after skipping BIOS (fixes mgba.io/i/1715 and mgba.io/i/1716)

11
src/gb/audio.c
View File

@ -390,6 +390,7 @@ void GBAudioWriteNR44(struct GBAudio* audio, uint8_t value) {
}
}
if (audio->playingCh4 && audio->ch4.envelope.dead != 2) {
audio->ch4.lastEvent = mTimingCurrentTime(audio->timing);
mTimingDeschedule(audio->timing, &audio->ch4Event);
mTimingSchedule(audio->timing, &audio->ch4Event, 0);
}
@ -581,14 +582,16 @@ void GBAudioUpdateFrame(struct GBAudio* audio, struct mTiming* timing) {
if (audio->playingCh4 && !audio->ch4.envelope.dead) {
--audio->ch4.envelope.nextStep;
if (audio->ch4.envelope.nextStep == 0) {
int8_t sample = audio->ch4.sample > 0;
audio->ch4.samples -= audio->ch4.sample;
int8_t sample = audio->ch4.sample;
_updateEnvelope(&audio->ch4.envelope);
if (audio->ch4.envelope.dead == 2) {
mTimingDeschedule(timing, &audio->ch4Event);
}
audio->ch4.sample = sample * audio->ch4.envelope.currentVolume;
audio->ch4.samples += audio->ch4.sample;
audio->ch4.sample = (sample > 0) * audio->ch4.envelope.currentVolume;
if (audio->ch4.nSamples) {
audio->ch4.samples -= sample;
audio->ch4.samples += audio->ch4.sample;
}
}
}
break;