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Merge pull request #155 from alexguirre/synthesizer
Synthesizer progress
This commit is contained in:
dexyfex
GitHub
commit
cb92346762
@ -432,8 +432,25 @@ namespace CodeWalker.Utils
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a[i] = Lerp(a[i], min, max);
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}
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break;
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//case Dat10Synth.Opcode.LERP_BUFFER_2:
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// break;
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case Dat10Synth.Opcode.LERP_BUFFER_2: // TODO: some better name for LERP_BUFFER_2
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{
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var t = GetScalar(param[1]);
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float[] min, max;
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if ((param[0].Value & 0xFF) == (param[2].Value & 0xFF))
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{
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min = GetBuffer(param[2]);
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max = GetBuffer(param[3]);
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}
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else
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{
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min = GetBuffer(param[3]);
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max = GetBuffer(param[2]);
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}
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for (int i = 0; i < BufferSize; i++)
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min[i] = Lerp(t, min[i], max[i]);
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}
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break;
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case Dat10Synth.Opcode.LERP_SCALAR:
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{
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var t = GetScalar(param[1]);
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@ -567,18 +584,24 @@ namespace CodeWalker.Utils
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GetScalar(param[5]),
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ref StateBlocks[param[6].Value]);
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break;
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//case Dat10Synth.Opcode.OnePole_LPF_BUFFER_BUFFER:
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// break;
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//case Dat10Synth.Opcode.OnePole_LPF_BUFFER_SCALAR:
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// break;
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//case Dat10Synth.Opcode.OnePole_LPF_SCALAR_SCALAR:
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// break;
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//case Dat10Synth.Opcode.OnePole_HPF_BUFFER_BUFFER:
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// break;
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//case Dat10Synth.Opcode.OnePole_HPF_BUFFER_SCALAR:
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// break;
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//case Dat10Synth.Opcode.OnePole_HPF_SCALAR_SCALAR:
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// break;
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case Dat10Synth.Opcode.OnePole_LPF_BUFFER_BUFFER:
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OnePoleLPF(GetBuffer(param[0]), GetBuffer(param[1]), ref StateBlocks[param[2].Value]);
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break;
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case Dat10Synth.Opcode.OnePole_LPF_BUFFER_SCALAR:
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OnePoleLPF(GetBuffer(param[0]), GetScalar(param[1]), ref StateBlocks[param[2].Value]);
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break;
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case Dat10Synth.Opcode.OnePole_LPF_SCALAR_SCALAR:
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SetRegister(param[0], OnePoleLPF(GetScalar(param[1]), GetScalar(param[2]), ref StateBlocks[param[3].Value]));
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break;
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case Dat10Synth.Opcode.OnePole_HPF_BUFFER_BUFFER:
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OnePoleHPF(GetBuffer(param[0]), GetBuffer(param[1]), ref StateBlocks[param[2].Value]);
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break;
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case Dat10Synth.Opcode.OnePole_HPF_BUFFER_SCALAR:
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OnePoleHPF(GetBuffer(param[0]), GetScalar(param[1]), ref StateBlocks[param[2].Value]);
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break;
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case Dat10Synth.Opcode.OnePole_HPF_SCALAR_SCALAR:
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SetRegister(param[0], OnePoleHPF(GetScalar(param[1]), GetScalar(param[2]), ref StateBlocks[param[3].Value]));
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break;
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case Dat10Synth.Opcode.OSC_RAMP_BUFFER_BUFFER:
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OscillatorRamp(GetBuffer(param[0]), ref StateBlocks[param[1].Value]);
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break;
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@ -816,8 +839,9 @@ namespace CodeWalker.Utils
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for (int i = 0; i < BufferSize; i++)
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a[i] = scalar;
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break;
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//case Dat10Synth.Opcode.AWProcess:
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// break;
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case Dat10Synth.Opcode.AWProcess:
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AWFilter(GetBuffer(param[0]), GetBuffer(param[1]), GetBuffer(param[2]), ref StateBlocks[param[3].Value]);
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break;
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case Dat10Synth.Opcode.LERP_BUFFER_BUFFER:
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{
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var t = GetBuffer(param[0]);
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@ -910,10 +934,12 @@ namespace CodeWalker.Utils
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SetRegister(param[0], result);
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}
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break;
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//case Dat10Synth.Opcode.AllpassProcess_BUFFER_SCALAR:
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// break;
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//case Dat10Synth.Opcode.AllpassProcess_BUFFER_BUFFER:
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// break;
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case Dat10Synth.Opcode.AllpassProcess_BUFFER_SCALAR:
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AllpassFilter(GetBuffer(param[0]), GetScalar(param[1]), ref StateBlocks[param[2].Value]);
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break;
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case Dat10Synth.Opcode.AllpassProcess_BUFFER_BUFFER:
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AllpassFilter(GetBuffer(param[0]), GetBuffer(param[1]), ref StateBlocks[param[2].Value]);
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break;
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case Dat10Synth.Opcode.FINISH:
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frameFinished = true;
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break;
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@ -1007,32 +1033,19 @@ namespace CodeWalker.Utils
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return (max - min) * t + min;
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}
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private float HardKnee(float y, float threshold)
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private float HardKnee(float sample, float threshold)
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{
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/*
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ENVELOPE_GEN__R_LINEAR_T_ONE_SHOT 0, 0.025, 0, 1, 0, 0, 1 => B0 [0]
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COPY_BUFFER B0 => B1
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HARD_KNEE_BUFFER B1, 0.25 => B1
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COPY_BUFFER B0 => B2
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HARD_KNEE_BUFFER B2, 0.85 => B2
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COPY_BUFFER B0 => B4
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HARD_KNEE_BUFFER B4, 0.75 => B4
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FILL_BUFFER 0 => B3
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FINISH =>
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*/
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// TODO(alexguirre): better names for HardKnee and maybe some comments
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float result;
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if (y < 0.0f)
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if (sample < 0.0f)
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result = 0.0f;
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else
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result = (y / threshold) * 0.5f;
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result = (sample / threshold) * 0.5f;
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if ((y - threshold) >= 0.0f)
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result = (((y - threshold) / (1.0f - threshold)) + 1.0f) * 0.5f;
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if (sample >= threshold)
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result = (((sample - threshold) / (1.0f - threshold)) + 1.0f) * 0.5f;
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if (y >= 1.0f)
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if (sample >= 1.0f)
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result = 1.0f;
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return result;
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@ -1048,10 +1061,11 @@ FINISH =>
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return (float)Math.Pow(Math.Max(0, a), b);
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}
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private float NoteToFrequency(float note)
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// https://newt.phys.unsw.edu.au/jw/notes.html
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private float NoteToFrequency(float midiNote)
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{
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// TODO(alexguirre): figure out the meaning of this formula and constants in NoteToFrequency
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return (float)Math.Pow(2.0f, (note + 36.376301f) / 12.0f);
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// A4 (note #69) = 440Hz
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return 440.0f * (float)Math.Pow(2.0f, (midiNote - 69) / 12.0f);
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}
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private void Decimate(float[] buffer, float scalar1, float deltaPerSample, ref StateBlock stateBlock)
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@ -1220,7 +1234,7 @@ FINISH =>
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float w = (float)(2.0 * Math.PI * centerFrequency / SampleRate);
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float cosW = (float)Math.Cos(w);
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float v14 = 1.0f / (float)Math.Tan((freq2 * 0.000020833333f) * Math.PI);
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float v14 = 1.0f / (float)Math.Tan(Math.PI * freq2 / SampleRate);
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b0 = 1.0f;
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b1 = 0.0f;
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@ -1243,7 +1257,7 @@ FINISH =>
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float w = (float)(2.0f * Math.PI * centerFrequency / SampleRate);
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float cosW = (float)Math.Cos(w);
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float v15 = (float)Math.Tan((freq2 * 0.000020833333f) * Math.PI);
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float v15 = (float)Math.Tan(Math.PI * freq2 / SampleRate);
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b0 = 1.0f;
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b1 = -2.0f * cosW;
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@ -1268,7 +1282,7 @@ FINISH =>
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float q = centerFrequency / freq2;
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float alpha = (float)Math.Sin(w) / (2.0f * q);
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float cosW = (float)Math.Cos(w);
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float A = Math.Max(0.000001f, gain * 1.4141999f); // TODO(alexguirre): this should be amp = 10.0 ** (gain_db/40.0), where does 1.41 come from? maybe gain not in dB?
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float A = Math.Max(0.000001f, gain * (float)Math.Sqrt(2)); // TODO(alexguirre): this should be amp = 10.0 ** (gain_db/40.0), where does sqrt(2) come from? maybe gain not in dB?
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b0 = 1.0f + alpha * A;
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b1 = -2.0f * cosW;
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@ -1338,53 +1352,96 @@ FINISH =>
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private void BiquadFilter2Pole(float[] buffer, float b0, float b1, float b2, float a1, float a2, ref StateBlock stateBlock)
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{
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// State block:
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// X -> ...
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// Y -> ...
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float stateX = stateBlock.X;
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float stateY = stateBlock.Y;
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float pole1 = stateBlock.X;
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float pole2 = stateBlock.Y;
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for (int i = 0; i < BufferSize; i++)
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{
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float x = (buffer[i] * b0) + stateX;
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stateX = (buffer[i] * b1) - (x * a1) + stateY;
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stateY = (buffer[i] * b2) - (x * a2);
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float s = buffer[i];
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float x = (s * b0) + pole1;
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pole1 = (s * b1) - (x * a1) + pole2;
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pole2 = (s * b2) - (x * a2);
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buffer[i] = x;
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}
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stateBlock.X = stateX;
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stateBlock.Y = stateY;
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stateBlock.X = pole1;
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stateBlock.Y = pole2;
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}
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private void BiquadFilter4Pole(float[] buffer, float b0, float b1, float b2, float a1, float a2, ref StateBlock stateBlock)
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{
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// State block:
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// X -> ...
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// Y -> ...
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// Z -> ...
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// W -> ...
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float stateX = stateBlock.X;
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float stateY = stateBlock.Y;
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float stateZ = stateBlock.Z;
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float stateW = stateBlock.W;
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float pole1 = stateBlock.X;
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float pole2 = stateBlock.Y;
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float pole3 = stateBlock.Z;
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float pole4 = stateBlock.W;
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for (int i = 0; i < BufferSize; i++)
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{
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float x = (buffer[i] * b0) + stateX;
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float y = (x * b0) + stateZ;
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stateX = (buffer[i] * b1) - (x * a1) + stateY;
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stateY = (buffer[i] * b2) - (x * a2);
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stateZ = (x * b1) - (y * a1) + stateW;
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stateW = (x * b2) - (y * a2);
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float s = buffer[i];
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float x = (s * b0) + pole1;
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pole1 = (s * b1) - (x * a1) + pole2;
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pole2 = (s * b2) - (x * a2);
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float y = (x * b0) + pole3;
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pole3 = (x * b1) - (y * a1) + pole4;
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pole4 = (x * b2) - (y * a2);
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buffer[i] = y;
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}
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stateBlock.X = stateX;
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stateBlock.Y = stateY;
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stateBlock.Z = stateZ;
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stateBlock.W = stateW;
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stateBlock.X = pole1;
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stateBlock.Y = pole2;
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stateBlock.Z = pole3;
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stateBlock.W = pole4;
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}
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// https://www.earlevel.com/main/2012/12/15/a-one-pole-filter/
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// TODO: verify OnePoleLPF/HPF results
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private void OnePoleLPF(float[] buffer, float[] frequencies, ref StateBlock stateBlock)
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{
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for (int i = 0; i < BufferSize; i++)
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{
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buffer[i] = OnePoleLPF(buffer[i], frequencies[i], ref stateBlock);
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}
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}
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private void OnePoleLPF(float[] buffer, float frequency, ref StateBlock stateBlock)
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{
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for (int i = 0; i < BufferSize; i++)
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{
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buffer[i] = OnePoleLPF(buffer[i], frequency, ref stateBlock);
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}
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}
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private float OnePoleLPF(float sample, float frequency, ref StateBlock stateBlock)
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{
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float previousSample = stateBlock.X;
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float b1 = (float)Math.Exp(-2.0f * Math.PI * frequency * 256.0f / SampleRate);
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float a0 = 1.0f - b1;
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float s = a0 * sample + (b1 * previousSample);
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stateBlock.X = s;
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return s;
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}
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private void OnePoleHPF(float[] buffer, float[] frequencies, ref StateBlock stateBlock)
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{
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for (int i = 0; i < BufferSize; i++)
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{
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buffer[i] = OnePoleHPF(buffer[i], frequencies[i], ref stateBlock);
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}
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}
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private void OnePoleHPF(float[] buffer, float frequency, ref StateBlock stateBlock)
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{
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for (int i = 0; i < BufferSize; i++)
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{
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buffer[i] = OnePoleHPF(buffer[i], frequency, ref stateBlock);
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}
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}
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private float OnePoleHPF(float sample, float frequency, ref StateBlock stateBlock)
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{
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return sample - OnePoleLPF(sample, frequency, ref stateBlock);
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}
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private void EnvelopeFollower(float[] buffer, float a2, float a3, ref StateBlock stateBlock)
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@ -1469,13 +1526,12 @@ FINISH =>
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// State block:
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// X -> latch SET
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// TODO(alexguirre): understand logic of TriggerLatch
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float stateSet = stateBlock.X;
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bool set = stateBlock.X != 0.0f;
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float latch = 0.0f;
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if (triggered && stateSet == 0.0f)
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if (triggered && !set)
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latch = 1.0f;
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if (triggered != (stateSet != 0.0f))
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if (triggered != set)
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{
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stateBlock.X = triggered ? 1.0f : 0.0f;
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}
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@ -1811,21 +1867,6 @@ FINISH =>
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// TODO(alexguirre): TimedTrigger may not be equivalent, game code has like 10 states, here I'm using the same states as the envelope gen
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// TODO(alexguirre): verify how TimedTrigger works in-game
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/*
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ENVELOPE_GEN__R_LINEAR_T_ONE_SHOT 0.1, 0.2, 0.3, 0.5, 0.4, 0.35, 1 => B6, R0 [1]
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TIMED_TRIGGER__T_ONE_SHOT 1, 0.1, 0.2, 0.3, 0.4, 0.35 => R1, R2, R3, R4, R5 [2]
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;FILL_BUFFER R0 => B0 ; envelope finished
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FILL_BUFFER R1 => B1 ; timed trigger finished
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;FILL_BUFFER R2 => B2 ; attack
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;FILL_BUFFER R3 => B3 ; decay
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;FILL_BUFFER R4 => B4 ; hold
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;FILL_BUFFER R5 => B5 ; release
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FILL_BUFFER 0 => B7
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FINISH =>
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*/
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private TimedTriggerResult TimedTrigger(EnvelopeTriggerMode triggerMode, ref StateBlock stateBlock, float trigger, float predelay, float attack, float decay, float hold, float release)
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{
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// State block:
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@ -2070,6 +2111,65 @@ FINISH =>
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}
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}
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private void AWFilter(float[] buffer, float[] buffer2, float[] buffer3, ref StateBlock stateBlock)
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{
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var s = stateBlock.X;
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for (int i = 0; i < BufferSize; i++)
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{
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var v10 = buffer3[i] * 64.0f;
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var v12 = (float)rnd.NextDouble() * v10 + buffer2[i] * 127.0f + 1.0f;
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var v13 = 1.0f / v12;
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var v14 = (1.0f - (v13 * v12)) * v13 + v13;
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s = s - ((s - buffer[i]) * v14);
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buffer[i] = s;
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}
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stateBlock.X = s;
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}
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// https://thewolfsound.com/allpass-filter/#first-order-iir-allpass
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private void AllpassFilter(float[] buffer, float breakFrequency, ref StateBlock stateBlock)
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{
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float previousUnfilteredSample = stateBlock.X;
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float previousSample = stateBlock.Y;
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float a1 = (float)Math.Tan(Math.PI * breakFrequency / SampleRate);
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a1 = (a1 - 1.0f) / (a1 + 1.0f);
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for (int i = 0; i < BufferSize; i++)
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{
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float sample = a1 * buffer[i] + previousUnfilteredSample - a1 * previousSample;
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sample = Math.Max(Math.Min(sample, 1.0f), -1.0f);
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previousUnfilteredSample = buffer[i];
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previousSample = sample;
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buffer[i] = sample;
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}
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stateBlock.X = previousUnfilteredSample;
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stateBlock.Y = previousSample;
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}
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private void AllpassFilter(float[] buffer, float[] breakFrequencies, ref StateBlock stateBlock)
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{
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float previousUnfilteredSample = stateBlock.X;
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float previousSample = stateBlock.Y;
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for (int i = 0; i < BufferSize; i++)
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{
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float a1 = (float)Math.Tan(Math.PI * breakFrequencies[i] / SampleRate);
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a1 = (a1 - 1.0f) / (a1 + 1.0f);
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float sample = a1 * buffer[i] + previousUnfilteredSample - a1 * previousSample;
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sample = Math.Max(Math.Min(sample, 1.0f), -1.0f);
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previousUnfilteredSample = buffer[i];
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previousSample = sample;
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buffer[i] = sample;
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}
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stateBlock.X = previousUnfilteredSample;
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stateBlock.Y = previousSample;
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}
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