chore: broken impl of ch1
This commit is contained in:
parent
c3611a0f00
commit
97a689ab55
403
src/apu.zig
403
src/apu.zig
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@ -32,9 +32,11 @@ pub const Apu = struct {
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stream: *SDL.SDL_AudioStream,
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sched: *Scheduler,
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fs: FrameSequencer,
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pub fn init(sched: *Scheduler) Self {
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const apu: Self = .{
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.ch1 = ToneSweep.init(),
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.ch1 = ToneSweep.init(sched),
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.ch2 = Tone.init(),
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.ch3 = Wave.init(),
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.ch4 = Noise.init(),
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@ -49,9 +51,13 @@ pub const Apu = struct {
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.sampling_cycle = 0b00,
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.stream = SDL.SDL_NewAudioStream(SDL.AUDIO_F32, 2, 1 << 15, SDL.AUDIO_F32, 2, host_sample_rate) orelse unreachable,
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.sched = sched,
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.fs = FrameSequencer.init(),
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};
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sched.push(.SampleAudio, sched.now() + apu.sampleTicks());
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sched.push(.{ .ApuChannel = 0 }, sched.now() + SquareWave.ticks);
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sched.push(.FrameSequencer, sched.now() + ((1 << 24) / 1 << 15));
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return apu;
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}
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@ -67,14 +73,39 @@ pub const Apu = struct {
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self.dma_cnt = new;
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}
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/// NR52
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pub fn setSoundCntX(self: *Self, value: bool) void {
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self.cnt.apu_enable.write(value);
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if (value) {
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self.fs.step = 0; // Reset Frame Sequencer
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// TODO: Reset Duty position for Square channels
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// TODO: Reset Channel 3 offset ptr
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} else {
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// TODO: Reset APU
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}
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}
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/// NR52
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pub fn soundCntX(self: *const Self) u32 {
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const apu_enable = @boolToInt(self.cnt.apu_enable.read());
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const ch1_enable = @boolToInt(self.ch1.enabled);
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const ch2_enable = @boolToInt(self.ch2.enabled);
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const ch3_enable = @boolToInt(self.ch3.enabled);
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const ch4_enable = @boolToInt(self.ch4.enabled);
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return apu_enable << 7 | ch4_enable << 3 | ch3_enable << 2 | ch2_enable << 1 | ch1_enable;
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}
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/// NR50
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pub fn setSoundCntLLow(self: *Self, byte: u8) void {
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self.ch_vol_cnt.raw = (self.ch_vol_cnt.raw & 0xFF00) | byte;
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}
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/// NR51
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pub fn setSoundCntLHigh(self: *Self, byte: u8) void {
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self.ch_vol_cnt.raw = @as(u16, byte) << 8 | (self.ch_vol_cnt.raw & 0xFF);
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}
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@ -84,16 +115,26 @@ pub const Apu = struct {
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}
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pub fn sampleAudio(self: *Self, late: u64) void {
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const chA = if (self.dma_cnt.chA_vol.read()) self.chA.amplitude() else self.chA.amplitude() / 2;
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const chA_left = if (self.dma_cnt.chA_left.read()) chA else 0;
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const chA_right = if (self.dma_cnt.chA_right.read()) chA else 0;
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const chB = if (self.dma_cnt.chB_vol.read()) self.chB.amplitude() else self.chB.amplitude() / 2;
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const chB_left = if (self.dma_cnt.chB_left.read()) chB else 0;
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const chB_right = if (self.dma_cnt.chB_right.read()) chB else 0;
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// Sample Channel 1
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const ch1_sample = self.ch1.amplitude();
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const ch1_left = if (self.ch_vol_cnt.ch1_left.read()) ch1_sample else 0;
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const ch1_right = if (self.ch_vol_cnt.ch1_right.read()) ch1_sample else 0;
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const left = (chA_left + chB_left) / 2;
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const right = (chA_right + chB_right) / 2;
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// Sample Dma Channels
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// const chA = if (self.dma_cnt.chA_vol.read()) self.chA.amplitude() else self.chA.amplitude() / 2;
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// const chA_left = if (self.dma_cnt.chA_left.read()) chA else 0;
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// const chA_right = if (self.dma_cnt.chA_right.read()) chA else 0;
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// const chB = if (self.dma_cnt.chB_vol.read()) self.chB.amplitude() else self.chB.amplitude() / 2;
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// const chB_left = if (self.dma_cnt.chB_left.read()) chB else 0;
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// const chB_right = if (self.dma_cnt.chB_right.read()) chB else 0;
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// Mix all Channels
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// const left = (chA_left + chB_left + ch1_left) / 3;
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// const right = (chA_right + chB_right + ch1_right) / 3
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const left = ch1_left;
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const right = ch1_right;
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if (self.sampling_cycle != self.bias.sampling_cycle.read()) {
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log.warn("Sampling Cycle changed from {} to {}", .{ self.sampling_cycle, self.bias.sampling_cycle.read() });
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@ -121,6 +162,36 @@ pub const Apu = struct {
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return @as(u64, 1) << (15 + @as(u6, self.bias.sampling_cycle.read()));
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}
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pub fn tickFrameSequencer(self: *Self, late: u64) void {
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self.fs.tick();
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switch (self.fs.step) {
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7 => self.tickEnvelopes(), // Clock Envelope
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0, 4 => self.tickLengths(), // Clock Length
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2, 6 => {
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// Clock Length and Sweep
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self.tickLengths();
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self.ch1.tickSweep();
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},
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1, 3, 5 => {},
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}
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self.sched.push(.FrameSequencer, self.sched.now() + ((1 << 24) / 1 << 15) - late);
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}
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fn tickLengths(self: *Self) void {
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self.ch1.tickLength();
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self.ch2.tickLength();
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self.ch3.tickLength();
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self.ch4.tickLength();
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}
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fn tickEnvelopes(self: *Self) void {
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self.ch1.tickEnvelope();
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self.ch2.tickEnvelope();
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self.ch4.tickEnvelope();
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}
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pub fn handleTimerOverflow(self: *Self, cpu: *Arm7tdmi, tim_id: u3) void {
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if (!self.cnt.apu_enable.read()) return;
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@ -148,21 +219,159 @@ const ToneSweep = struct {
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/// NR13, NR14
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freq: io.Frequency,
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fn init() Self {
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/// Length Functionality
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len_dev: Length,
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/// Sweep Functionality
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sweep_dev: Sweep,
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/// Envelope Functionality
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env_dev: Envelope,
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square: SquareWave,
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enabled: bool,
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sample: u8,
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const Sweep = struct {
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const This = @This();
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timer: u8,
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enabled: bool,
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shadow: u11,
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pub fn init() This {
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return .{
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.timer = 0,
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.enabled = false,
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.shadow = 0,
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};
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}
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pub fn tick(this: *This, ch1: *Self) void {
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if (this.timer != 0) this.timer -= 1;
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if (this.timer == 0) {
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const period = ch1.sweep.period.read();
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this.timer = if (period == 0) 8 else period;
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if (this.enabled and period != 0) {
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const new_freq: u11 = this.calcFrequency(ch1);
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if (new_freq <= 0x7FF and ch1.sweep.shift.read() != 0) {
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ch1.freq.frequency.write(new_freq);
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this.shadow = new_freq;
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_ = this.calcFrequency(ch1);
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}
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}
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}
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}
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fn calcFrequency(this: *This, ch1: *Self) u11 {
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const shadow_shifted = this.shadow >> ch1.sweep.shift.read();
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const decrease = ch1.sweep.direction.read();
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const freq = if (decrease) this.shadow - shadow_shifted else this.shadow + shadow_shifted;
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if (freq > 0x7FF) ch1.enabled = false;
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return freq;
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}
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};
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fn init(sched: *Scheduler) Self {
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return .{
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.sweep = .{ .raw = 0 },
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.duty = .{ .raw = 0 },
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.envelope = .{ .raw = 0 },
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.freq = .{ .raw = 0 },
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.sample = 0,
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.enabled = false,
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.square = SquareWave.init(sched),
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.len_dev = Length.init(),
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.sweep_dev = Sweep.init(),
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.env_dev = Envelope.init(),
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};
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}
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fn tickSweep(self: *Self) void {
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self.sweep_dev.tick(self);
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}
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pub fn tickLength(self: *Self) void {
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self.len_dev.tick(self.freq, &self.enabled);
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}
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pub fn tickEnvelope(self: *Self) void {
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self.env_dev.tick(self.envelope);
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}
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pub fn channelTimerOverflow(self: *Self, late: u64) void {
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self.square.handleTimerOverflow(self.freq, late);
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self.sample = 0;
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if (!self.isDacEnabled()) return;
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self.sample = if (self.enabled) self.square.getSample(self.duty) * self.env_dev.vol else 0;
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}
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fn amplitude(self: *const Self) f32 {
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return (@intToFloat(f32, self.sample) / 7.5) - 1.0;
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}
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/// NR11
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pub fn setDuty(self: *Self, value: u8) void {
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self.duty.raw = value;
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self.len_dev.timer = 64 - self.duty.length.read();
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}
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/// NR12
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pub fn setEnvelope(self: *Self, value: u8) void {
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self.envelope.raw = value;
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if (!self.isDacEnabled()) self.enabled = false;
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}
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/// NR13
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pub fn setFreqLow(self: *Self, byte: u8) void {
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self.freq.raw = (self.freq.raw & 0xFF00) | byte;
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}
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/// NR14
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pub fn setFreqHigh(self: *Self, byte: u8) void {
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self.freq.raw = (@as(u16, byte) << 8) | (self.freq.raw & 0xFF);
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var new: io.Frequency = .{ .raw = (@as(u16, byte) << 8) | (self.freq.raw & 0xFF) };
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if (new.trigger.read()) {
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if (self.len_dev.timer == 0) {
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self.len_dev.timer = 64;
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// FIXME: This conflicts with my GB emulator
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new.length_enable.write(false);
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}
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// TODO: Reload Frequency Timer (last two bits unmodified)
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self.square.reloadTimer(self.freq.frequency.read());
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// Reload Envelope period and timer
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self.env_dev.timer = self.envelope.period.read();
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self.env_dev.vol = self.envelope.init_vol.read();
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// Sweep Trigger Behaviour
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const sw_period = self.sweep.period.read();
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const sw_shift = self.sweep.shift.read();
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self.sweep_dev.shadow = self.freq.frequency.read();
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self.sweep_dev.timer = if (sw_period == 0) 8 else sw_period;
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self.sweep_dev.enabled = sw_period != 0 or sw_shift != 0;
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if (sw_shift != 0) _ = self.sweep_dev.calcFrequency(self);
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self.enabled = self.isDacEnabled();
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}
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self.freq = new;
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}
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fn isDacEnabled(self: *const Self) bool {
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return self.envelope.raw & 0xF8 != 0;
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}
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};
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@ -176,14 +385,34 @@ const Tone = struct {
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/// NR23, NR24
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freq: io.Frequency,
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/// Length Functionarlity
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len_dev: Length,
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/// Envelope Functionality
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env_dev: Envelope,
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enabled: bool,
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fn init() Self {
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return .{
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.duty = .{ .raw = 0 },
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.envelope = .{ .raw = 0 },
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.freq = .{ .raw = 0 },
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.enabled = false,
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.len_dev = Length.init(),
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.env_dev = Envelope.init(),
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};
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}
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pub fn tickLength(self: *Self) void {
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self.len_dev.tick(self.freq, &self.enabled);
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}
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pub fn tickEnvelope(self: *Self) void {
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self.env_dev.tick(self.envelope);
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}
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pub fn setFreqLow(self: *Self, byte: u8) void {
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self.freq.raw = (self.freq.raw & 0xFF00) | byte;
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}
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@ -206,15 +435,27 @@ const Wave = struct {
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/// NR33, NR34
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freq: io.Frequency,
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/// Length Functionarlity
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len_dev: Length,
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enabled: bool,
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fn init() Self {
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return .{
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.select = .{ .raw = 0 },
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.vol = .{ .raw = 0 },
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.freq = .{ .raw = 0 },
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.length = 0,
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.len_dev = Length.init(),
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.enabled = false,
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};
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}
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pub fn tickLength(self: *Self) void {
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self.len_dev.tick(self.freq, &self.enabled);
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}
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pub fn setFreqLow(self: *Self, byte: u8) void {
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self.freq.raw = (self.freq.raw & 0xFF00) | byte;
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}
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@ -237,14 +478,34 @@ const Noise = struct {
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/// NR44
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cnt: io.NoiseControl,
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/// Length Functionarlity
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len_dev: Length,
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/// Envelope Functionality
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env_dev: Envelope,
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enabled: bool,
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fn init() Self {
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return .{
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.len = 0,
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.envelope = .{ .raw = 0 },
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.poly = .{ .raw = 0 },
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.cnt = .{ .raw = 0 },
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.enabled = false,
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.len_dev = Length.init(),
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.env_dev = Envelope.init(),
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};
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}
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pub fn tickLength(self: *Self) void {
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self.len_dev.ch4Tick(self.cnt, &self.enabled);
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}
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pub fn tickEnvelope(self: *Self) void {
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self.env_dev.tick(self.envelope);
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}
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};
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pub fn DmaSound(comptime kind: DmaSoundKind) type {
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@ -285,3 +546,123 @@ const DmaSoundKind = enum {
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A,
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B,
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};
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const FrameSequencer = struct {
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const Self = @This();
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step: u3,
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pub fn init() Self {
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return .{ .step = 0 };
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}
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pub fn tick(self: *Self) void {
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self.step +%= 1;
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}
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};
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const Length = struct {
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const Self = @This();
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timer: u16,
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pub fn init() Self {
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return .{ .timer = 0 };
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}
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fn tick(self: *Self, freq: io.Frequency, ch_enabled: *bool) void {
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const len_enable = freq.length_enable.read();
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if (len_enable and self.timer > 0) {
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self.timer -= 1;
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// if length timer is now 0
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if (self.timer == 0) ch_enabled.* = false;
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}
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}
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fn ch4Tick(self: *Self, cnt: io.NoiseControl, ch_enabled: *bool) void {
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const len_enable = cnt.length_enable.read();
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if (len_enable and self.timer > 0) {
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self.timer -= 1;
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// if length timer is now 0
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if (self.timer == 0) ch_enabled.* = false;
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}
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}
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};
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const Envelope = struct {
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const Self = @This();
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/// Period Timer
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timer: u3,
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/// Current Volume
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vol: u4,
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pub fn init() Self {
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return .{ .timer = 0, .vol = 0 };
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}
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pub fn tick(self: *Self, cnt: io.Envelope) void {
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if (cnt.period.read() != 0) {
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if (self.timer != 0) self.timer -= 1;
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if (self.timer == 0) {
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self.timer = cnt.period.read();
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if (cnt.direction.read()) {
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if (self.vol > 0x0) self.vol -= 1;
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} else {
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if (self.vol < 0xF) self.vol += 1;
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}
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}
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}
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}
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};
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const SquareWave = struct {
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const Self = @This();
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const ticks: u64 = (1 << 24) / (1 << 18);
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pos: u3,
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sched: *Scheduler,
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pub fn init(sched: *Scheduler) Self {
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return .{
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.pos = 0,
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.sched = sched,
|
||||
};
|
||||
}
|
||||
|
||||
fn handleTimerOverflow(self: *Self, cnt: io.Frequency, late: u64) void {
|
||||
const when = (2048 - @as(u64, cnt.frequency.read())) * 4;
|
||||
|
||||
self.pos = (self.pos +% 1) & 7;
|
||||
self.sched.push(.{ .ApuChannel = 0 }, when * ticks - late);
|
||||
}
|
||||
|
||||
fn reloadTimer(self: *Self, value: u11) void {
|
||||
self.sched.removeScheduledEvent(.{ .ApuChannel = 0 });
|
||||
|
||||
// TODO: Implement Obscure Behaviour
|
||||
const when = (2048 - @as(u64, value)) * 4;
|
||||
|
||||
self.sched.push(.{ .ApuChannel = 0 }, when * ticks);
|
||||
}
|
||||
|
||||
fn getSample(self: *const Self, cnt: io.Duty) u1 {
|
||||
const pattern = cnt.pattern.read(); // 2^18
|
||||
|
||||
const i = self.pos ^ 7; // index of 0 should get highest bit
|
||||
const result = switch (pattern) {
|
||||
0b00 => @as(u8, 0b00000001) >> i, // 1/8th
|
||||
0b01 => @as(u8, 0b10000001) >> i, // 1/4th
|
||||
0b10 => @as(u8, 0b10000111) >> i, // 1/2nd
|
||||
0b11 => @as(u8, 0b01111110) >> i, // 3/4th
|
||||
};
|
||||
|
||||
return @truncate(u1, result);
|
||||
}
|
||||
};
|
||||
|
|
|
|||
|
|
@ -51,6 +51,13 @@ pub const Scheduler = struct {
|
|||
3 => cpu.bus.tim._3.handleOverflow(cpu, late),
|
||||
}
|
||||
},
|
||||
.ApuChannel => |id| {
|
||||
switch (id) {
|
||||
0 => cpu.bus.apu.ch1.channelTimerOverflow(late),
|
||||
else => {},
|
||||
}
|
||||
},
|
||||
.FrameSequencer => cpu.bus.apu.tickFrameSequencer(late),
|
||||
.SampleAudio => cpu.bus.apu.sampleAudio(late),
|
||||
.HBlank => cpu.bus.ppu.handleHBlankEnd(cpu, late), // The end of a HBlank
|
||||
.VBlank => cpu.bus.ppu.handleHDrawEnd(cpu, late), // The end of a VBlank
|
||||
|
|
@ -104,4 +111,6 @@ pub const EventKind = union(enum) {
|
|||
Draw,
|
||||
TimerOverflow: u2,
|
||||
SampleAudio,
|
||||
FrameSequencer,
|
||||
ApuChannel: u2,
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue