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GB Audio: Fix channel 3 volume being changed between samples (fixes #1896)

This commit is contained in:
Vicki Pfau 2022-12-07 01:21:21 -08:00
parent 3385f02b51
commit e9ec009836
2 changed files with 24 additions and 0 deletions
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1
CHANGES
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@ -4,6 +4,7 @@ Features:
- Debugger: Add range watchpoints
Emulation fixes:
- GB Audio: Fix channels 1/2 not playing when resetting volume (fixes mgba.io/i/2614)
- GB Audio: Fix channel 3 volume being changed between samples (fixes mgba.io/i/1896)
- GB Serialize: Don't write BGP/OBP when loading SCGB state (fixes mgba.io/i/2694)
- GB SIO: Further fix bidirectional transfer starting
- GBA: Fix resetting key IRQ state (fixes mgba.io/i/2716)

23
src/gb/audio.c
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@ -269,6 +269,29 @@ void GBAudioWriteNR31(struct GBAudio* audio, uint8_t value) {
void GBAudioWriteNR32(struct GBAudio* audio, uint8_t value) {
GBAudioRun(audio, mTimingCurrentTime(audio->timing), 0x4);
audio->ch3.volume = GBAudioRegisterBankVolumeGetVolumeGB(value);
audio->ch3.sample = audio->ch3.wavedata8[audio->ch3.window >> 1];
if (!(audio->ch3.window & 1)) {
audio->ch3.sample >>= 4;
}
audio->ch3.sample &= 0xF;
int volume;
switch (audio->ch3.volume) {
case 0:
volume = 4;
break;
case 1:
volume = 0;
break;
case 2:
volume = 1;
break;
default:
case 3:
volume = 2;
break;
}
audio->ch3.sample >>= volume;
}
void GBAudioWriteNR33(struct GBAudio* audio, uint8_t value) {