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feat(apu): add timer/sequencer/LFSR fields for channel output tracking

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Sergey Cherkasov
2026-03-13 16:06:37 +03:00
parent 6f81eb4b08
commit cd0a99a813
4 changed files with 66 additions and 1 deletions
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19
src/native_core/apu/api.rs
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@@ -34,6 +34,12 @@ impl Apu {
frame_reset_delay: 0,
pending_frame_mode_5step: false,
pending_frame_irq_inhibit: false,
pulse_timer_counter: [0; 2],
pulse_duty_step: [0; 2],
triangle_timer_counter: 0,
triangle_step: 0,
noise_timer_counter: 0,
noise_lfsr: 1, // LFSR initialized to 1 per NES hardware
}
}
@@ -227,6 +233,13 @@ impl Apu {
out.push(self.frame_reset_delay);
out.push(u8::from(self.pending_frame_mode_5step));
out.push(u8::from(self.pending_frame_irq_inhibit));
out.extend_from_slice(&self.pulse_timer_counter[0].to_le_bytes());
out.extend_from_slice(&self.pulse_timer_counter[1].to_le_bytes());
out.extend_from_slice(&self.pulse_duty_step);
out.extend_from_slice(&self.triangle_timer_counter.to_le_bytes());
out.push(self.triangle_step);
out.extend_from_slice(&self.noise_timer_counter.to_le_bytes());
out.extend_from_slice(&self.noise_lfsr.to_le_bytes());
}
pub fn load_state_tail(&mut self, state: ApuStateTail) {
@@ -260,5 +273,11 @@ impl Apu {
self.frame_reset_delay = state.frame_reset_delay;
self.pending_frame_mode_5step = state.pending_frame_mode_5step;
self.pending_frame_irq_inhibit = state.pending_frame_irq_inhibit;
self.pulse_timer_counter = state.pulse_timer_counter;
self.pulse_duty_step = [state.pulse_duty_step[0] & 0x07, state.pulse_duty_step[1] & 0x07];
self.triangle_timer_counter = state.triangle_timer_counter;
self.triangle_step = state.triangle_step & 0x1F;
self.noise_timer_counter = state.noise_timer_counter;
self.noise_lfsr = if state.noise_lfsr == 0 { 1 } else { state.noise_lfsr };
}
}