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Read wave form while playing

This commit is contained in:
Lior Halphon 2016-09-13 17:40:10 +03:00
parent 594aea2d5a
commit f274cbc2ec
1 changed files with 5 additions and 2 deletions
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7
Core/apu.c
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@ -239,7 +239,6 @@ void GB_apu_init(GB_gameboy_t *gb)
uint8_t GB_apu_read(GB_gameboy_t *gb, uint8_t reg)
{
/* Todo: what happens when reading from the wave from while it's playing? */
GB_apu_run_internal(gb);
if (reg == GB_IO_NR52) {
@ -271,7 +270,11 @@ uint8_t GB_apu_read(GB_gameboy_t *gb, uint8_t reg)
};
if (reg >= GB_IO_WAV_START && reg <= GB_IO_WAV_END && gb->apu.wave_channels[2].is_playing) {
return (uint8_t)((gb->display_cycles * 22695477 * reg) >> 8); // Semi-random but deterministic
if (gb->apu.wave_channels[2].wave_length == 0) {
return gb->apu.wave_form[0];
}
gb->apu.wave_channels[2].phase %= gb->apu.wave_channels[2].wave_length;
return gb->apu.wave_form[(int)(gb->apu.wave_channels[2].phase * 32 / gb->apu.wave_channels[2].wave_length)];
}
return gb->io_registers[reg] | read_mask[reg - GB_IO_NR10];