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feat: schedule audio sampling on scheduler

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DMA sound in games like Pokemon Emerald, Chobits, Love Hina, and Kirby:
Nightmare in Dream Land sound great save for conerns about resampling
This commit is contained in:
Rekai Nyangadzayi Musuka
2022-04-14 05:58:32 -03:00
parent 92cabd248b
commit 172a59aefb
6 changed files with 67 additions and 69 deletions
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20
src/bus/io.zig
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@@ -595,20 +595,20 @@ pub const ChannelVolumeControl = extern union {
/// Read / Write
pub const DmaSoundControl = extern union {
ch_vol: Bitfield(u16, 0, 2),
sa_vol: Bit(u16, 2),
sb_vol: Bit(u16, 3),
chA_vol: Bit(u16, 2),
chB_vol: Bit(u16, 3),
sa_right_enable: Bit(u16, 8),
sa_left_enable: Bit(u16, 9),
sa_timer: Bit(u16, 10),
chA_right: Bit(u16, 8),
chA_left: Bit(u16, 9),
chA_timer: Bit(u16, 10),
/// Write only?
sa_reset: Bit(u16, 11),
chA_reset: Bit(u16, 11),
sb_right_enable: Bit(u16, 12),
sb_left_enable: Bit(u16, 13),
sb_timer: Bit(u16, 14),
chB_right: Bit(u16, 12),
chB_left: Bit(u16, 13),
chB_timer: Bit(u16, 14),
/// Write only?
sb_reset: Bit(u16, 15),
chB_reset: Bit(u16, 15),
raw: u16,
};

8
src/bus/timer.zig
View File

@@ -109,13 +109,7 @@ fn Timer(comptime id: u2) type {
// DMA Sound Things
if (id == 0 or id == 1) {
const apu = &cpu.bus.apu;
const a_tim = @boolToInt(apu.dma_cnt.sa_timer.read());
const b_tim = @boolToInt(apu.dma_cnt.sb_timer.read());
if (a_tim == id) apu.handleTimerOverflow(.A, cpu);
if (b_tim == id) apu.handleTimerOverflow(.B, cpu);
cpu.bus.apu.handleTimerOverflow(cpu, id);
}
// Perform Cascade Behaviour