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This is probably not correct (and makes no sense from an hardware design perspective), but this correctly emulates my analog test cases and fixes the pops introduced by the last commit.

This commit is contained in:
Lior Halphon 2018-02-13 23:13:15 +02:00
parent bfb37884e1
commit 0c231db9e7
1 changed files with 7 additions and 3 deletions
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10
Core/apu.c
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@ -24,13 +24,13 @@ static void refresh_channel(GB_gameboy_t *gb, unsigned index, unsigned cycles_of
static void update_sample(GB_gameboy_t *gb, unsigned index, uint8_t value, unsigned cycles_offset) static void update_sample(GB_gameboy_t *gb, unsigned index, uint8_t value, unsigned cycles_offset)
{ {
gb->apu.samples[index] = value; gb->apu.samples[index] = value;
if (gb->apu_output.sample_rate) { if (gb->apu.is_active[index] && gb->apu_output.sample_rate) {
unsigned left_volume = 0; unsigned left_volume = 0;
if (gb->apu.is_active[index] && (gb->io_registers[GB_IO_NR51] & (1 << index))) { if (gb->io_registers[GB_IO_NR51] & (1 << index)) {
left_volume = (gb->io_registers[GB_IO_NR50] & 7) + 1; left_volume = (gb->io_registers[GB_IO_NR50] & 7) + 1;
} }
unsigned right_volume = 0; unsigned right_volume = 0;
if (gb->apu.is_active[index] && (gb->io_registers[GB_IO_NR51] & (0x10 << index))) { if (gb->io_registers[GB_IO_NR51] & (0x10 << index)) {
right_volume = ((gb->io_registers[GB_IO_NR50] >> 4) & 7) + 1; right_volume = ((gb->io_registers[GB_IO_NR50] >> 4) & 7) + 1;
} }
GB_sample_t output = {(0xf - value) * left_volume, (0xf - value) * right_volume}; GB_sample_t output = {(0xf - value) * left_volume, (0xf - value) * right_volume};
@ -90,6 +90,10 @@ static void render(GB_gameboy_t *gb)
right_volume += ((gb->io_registers[GB_IO_NR50] >> 4) & 7) * CH_STEP * 0xF; right_volume += ((gb->io_registers[GB_IO_NR50] >> 4) & 7) * CH_STEP * 0xF;
} }
} }
else {
left_volume += gb->apu_output.current_sample[i].left * CH_STEP;
right_volume += gb->apu_output.current_sample[i].right * CH_STEP;
}
mask >>= 1; mask >>= 1;
} }
gb->apu_output.highpass_diff = (GB_double_sample_t) gb->apu_output.highpass_diff = (GB_double_sample_t)