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Emulate a new APU glitch, tweak another. Fixes #617 (Telefang sample audio being broken on CGB-D and CGB-E)

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Lior Halphon
2024-06-03 00:19:26 +03:00
parent b1fec62564
commit 5be5bc4709
1 changed files with 6 additions and 1 deletions
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7
Core/apu.c
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@@ -1215,8 +1215,12 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
case GB_IO_NR13:
case GB_IO_NR23: {
GB_channel_t index = reg == GB_IO_NR23? GB_SQUARE_2: GB_SQUARE_1;
bool just_reloaded = gb->apu.square_channels[index].sample_countdown == (gb->apu.square_channels[index].sample_length ^ 0x7FF) * 2 + 1;
gb->apu.square_channels[index].sample_length &= ~0xFF;
gb->apu.square_channels[index].sample_length |= value & 0xFF;
if (just_reloaded) {
gb->apu.square_channels[index].sample_countdown = (gb->apu.square_channels[index].sample_length ^ 0x7FF) * 2 + 1;
}
break;
}
@@ -1264,7 +1268,8 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
else {
unsigned extra_delay = 0;
if (gb->model == GB_MODEL_CGB_E || gb->model == GB_MODEL_CGB_D) {
if (!(value & 4) && !(((gb->apu.square_channels[index].sample_countdown - 1 - gb->apu.square_channels[index].delay) / 2) & 0x400)) {
bool just_reloaded = gb->apu.square_channels[index].sample_countdown == (old_sample_length ^ 0x7FF) * 2 + 1;
if (!just_reloaded && !(value & 4) && !(((gb->apu.square_channels[index].sample_countdown - 1 - gb->apu.square_channels[index].delay) / 2) & 0x400)) {
gb->apu.square_channels[index].current_sample_index++;
gb->apu.square_channels[index].current_sample_index &= 0x7;
gb->apu.square_channels[index].sample_surpressed = false;