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Minor APU bug fix

This commit is contained in:
Lior Halphon 2021-01-02 18:27:21 +02:00
parent a9c337264e
commit ecace40fb0
1 changed files with 4 additions and 0 deletions
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4
Core/apu.c
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@ -846,6 +846,10 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
}
else {
/* Timing quirk: if already active, sound starts 2 (2MHz) ticks earlier.*/
if (gb->apu.square_channels[index].sample_countdown <= 1) {
gb->apu.square_channels[index].current_sample_index++;
gb->apu.square_channels[index].current_sample_index &= 0x7;
}
gb->apu.square_channels[index].sample_countdown = (gb->apu.square_channels[index].sample_length ^ 0x7FF) * 2 + 4 - gb->apu.lf_div;
}
gb->apu.square_channels[index].current_volume = gb->io_registers[index == GB_SQUARE_1 ? GB_IO_NR12 : GB_IO_NR22] >> 4;