formatting cleanup
This commit is contained in:
Gordon JC Pearce
parent
36c27f14d8
commit
ad7b7f4405
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@ -48,50 +48,74 @@ class Module {
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float saw = 0, square = 0, sub = 0, noise = 0;
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#if 0
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struct {
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uint8_t lfoRate = 0x58;
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uint8_t lfoDelay = 0x00;
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uint8_t vcoLfo = 0x00;
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uint8_t pwmLfo = 0x3b;
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uint8_t noise = 0x00;
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uint8_t vcfFreq = 0x25; // 1c; // 0x3f80
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uint8_t vcfReso = 0x6a;
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uint8_t vcfEnv = 0x25; // 4e;
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uint8_t vcfLfo = 0x00;
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uint8_t vcfKey = 0x00; // 47;
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uint8_t vca = 0x35;
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uint8_t env_a = 0x00;
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uint8_t env_d = 0x3c;
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uint8_t env_s = 0x00; // 0x3f80
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uint8_t env_r = 0x3c;
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uint8_t sub = 0x7f;
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uint8_t switch1 = 0x4a;
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uint8_t switch2 = 0x18;
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} patchRam;
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/*
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#if 0
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struct {
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uint8_t lfoRate = 0x58;
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uint8_t lfoDelay = 0x00;
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uint8_t vcoLfo = 0x00;
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uint8_t pwmLfo = 0x3b;
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uint8_t noise = 0x00;
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uint8_t vcfFreq = 0x25; // 1c; // 0x3f80
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uint8_t vcfReso = 0x6a;
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uint8_t vcfEnv = 0x25; // 4e;
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uint8_t vcfLfo = 0x00;
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uint8_t vcfKey = 0x00; // 47;
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uint8_t vca = 0x35;
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uint8_t env_a = 0x00;
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uint8_t env_d = 0x3c;
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uint8_t env_s = 0x00; // 0x3f80
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uint8_t env_r = 0x3c;
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uint8_t sub = 0x7f;
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uint8_t switch1 = 0x4a;
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uint8_t switch2 = 0x18;
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} patchRam;
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#else
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struct {
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uint8_t lfoRate = 0x40;
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uint8_t lfoDelay = 0x00;
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uint8_t vcoLfo = 0x00;
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uint8_t pwmLfo = 0x00;
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uint8_t noise = 0x01;
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uint8_t vcfFreq = 0x31;
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uint8_t vcfReso = 0x7f;
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uint8_t vcfEnv = 0x00;
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uint8_t vcfLfo = 0x00;
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uint8_t vcfKey = 0x7f;
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uint8_t vca = 0x40;
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uint8_t env_a = 0x00;
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uint8_t env_d = 0x00;
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uint8_t env_s = 0x00; // 0x3f80
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uint8_t env_r = 0x00;
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uint8_t sub = 0x00;
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uint8_t switch1 = 0x22;
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uint8_t switch2 = 0x1d;
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} patchRam;
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#endif
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*/
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#else
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struct {
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uint8_t lfoRate = 0x40;
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uint8_t lfoRate = 0x58;
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uint8_t lfoDelay = 0x00;
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uint8_t vcoLfo = 0x00;
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uint8_t pwmLfo = 0x00;
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uint8_t noise = 0x01;
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uint8_t vcfFreq = 0x31;
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uint8_t noise = 0x00;
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uint8_t vcfFreq = 0x00; // 1c; // 0x3f80
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uint8_t vcfReso = 0x7f;
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uint8_t vcfEnv = 0x00;
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uint8_t vcfEnv = 0x7f; // 4e;
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uint8_t vcfLfo = 0x00;
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uint8_t vcfKey = 0x7f;
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uint8_t vca = 0x40;
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uint8_t vcfKey = 0x00; // 47;
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uint8_t vca = 0x20;
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uint8_t env_a = 0x00;
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uint8_t env_d = 0x00;
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uint8_t env_d = 0x5c;
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uint8_t env_s = 0x00; // 0x3f80
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uint8_t env_r = 0x00;
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uint8_t sub = 0x00;
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uint8_t switch1 = 0x22;
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uint8_t switch2 = 0x1d;
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uint8_t env_r = 0x3c;
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uint8_t sub = 0x7f;
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uint8_t switch1 = 0x3a;
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uint8_t switch2 = 0x19;
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} patchRam;
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#endif
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Chorus* chorus;
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float vcaTC;
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@ -128,7 +152,7 @@ class Voice {
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uint8_t envPhase = 0;
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int16_t env = 0; // output amplitude
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int16_t vcfCut;
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uint16_t vcfCut;
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int16_t vcaEnv;
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float vcaRC = 0, vcfRC = 0;
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@ -137,6 +161,7 @@ class Voice {
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// filter
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float y0 = 0, y1 = 0, y2 = 0, y3 = 0;
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double s[4] = {0, 0, 0, 0};
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float zi = 0;
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};
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#endif
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121
plugin/voice.cpp
121
plugin/voice.cpp
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@ -41,7 +41,7 @@ Voice::Voice() {
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void Voice::on(uint8_t midiNote) {
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while (midiNote < 24) midiNote += 12;
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while (midiNote > 108) midiNote -=12;
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while (midiNote > 108) midiNote -= 12;
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note = midiNote - 24;
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envPhase = 1;
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}
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@ -50,45 +50,26 @@ void Voice::off() {
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envPhase = 0;
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}
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// tanh(x)/x approximation, flatline at very high inputs
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// so might not be safe for very large feedback gains
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// [limit is 1/15 so very large means ~15 or +23dB]
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double tanhXdX(double x) {
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float s = 0.0333, d = 30.0;
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return 1.0f - s * (d + 1.0f) * x * x / (d + x * x);
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return 1-0.1*abs(x);
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double a = x*x;
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// IIRC I got this as Pade-approx for tanh(sqrt(x))/sqrt(x)
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return ((a + 105)*a + 945) / ((15*a + 420)*a + 945);
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}
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void Voice::run(Module* m, float* buffer, uint32_t samples) {
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// carry out per-voice calculations for each block of samples
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float out, t, fb;
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double zi;
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// calculate cutoff frequency
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float cut = 248.0f * (powf(2, (vcfCut - 0x1880) / 1143.0f));
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float cut = 261.0f * (powf(2, (vcfCut - 0x1880) / 1143.0f));
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cut = M_PI * cut / sampleRate;
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cut = cut / (1 + cut); // correct tuning warp
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// printf("%f\n", cut);
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//if (cut > 0.5) cut = 0.5;
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// double f = tan(cut);
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//printf("cut = %4f f = %4f\n", cut, f);
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double r = (40.0/9.0) * m->res;
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cut = cut / (1 + cut); // correct tuning warp
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// if (cut > 0.7) cut = 0.7;
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double r = 5 * m->res;
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float amp = vcaEnv / 4096.0f;
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@ -125,45 +106,48 @@ double zi;
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// FIXME DC offset removal
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delay += m->saw * (1 - (2 * theta));
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delay += m->square * ((pulseStage ? -1.f : 1.f) - m->pwmBuf[i] + 0.5);
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delay += m->subBuf[i] * subosc ;
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delay += m->subBuf[i] * subosc;
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out += m->noise * (0.8 - 1.6 * (rand() & 0xffff) / 65536.0);
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out *= 0.01;
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// out *= 0.1;
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// same time constant for both VCF and VCF RC circuits
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vcfRC = (cut - vcfRC) * m->vcaTC + vcfRC;
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#if 1
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//// LICENSE TERMS: Copyright 2012 Teemu Voipio
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//
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// You can use this however you like for pretty much any purpose,
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// as long as you don't claim you wrote it. There is no warranty.
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//
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// Distribution of substantial portions of this code in source form
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// must include this copyright notice and list of conditions.
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//
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//// LICENSE TERMS: Copyright 2012 Teemu Voipio
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//
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// You can use this however you like for pretty much any purpose,
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// as long as you don't claim you wrote it. There is no warranty.
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//
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// Distribution of substantial portions of this code in source form
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// must include this copyright notice and list of conditions.
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//
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// input delay and state for member variables
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// input delay and state for member variables
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// cutoff as normalized frequency (eg 0.5 = Nyquist)
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// resonance from 0 to 1, self-oscillates at settings over 0.9
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//void transistorLadder(
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// double cutoff, double resonance,
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// double * in, double * out, unsigned nsamples)
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//{
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// tuning and feedback
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// cutoff as normalized frequency (eg 0.5 = Nyquist)
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// resonance from 0 to 1, self-oscillates at settings over 0.9
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// void transistorLadder(
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// double cutoff, double resonance,
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// double * in, double * out, unsigned nsamples)
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//{
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// tuning and feedback
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//------------------------------------------------------------------------------ sample loop
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//for(unsigned n = 0; n < nsamples; ++n)
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//{
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//------------------------------------------------------------------------------ sample loop
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// for(unsigned n = 0; n < nsamples; ++n)
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//{
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out *= 0.025;
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// input with half delay, for non-linearities
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double ih = 0.5 * (out + zi); zi = out;
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double ih = 0.5 * (out + zi);
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zi = out;
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//double ih = out;
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// double ih = out;
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// evaluate the non-linear gains
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double t0 = tanhXdX((ih * (r+1))- r * s[3]);
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double t0 = tanhXdX((ih * (r + 1)) - r * s[3]);
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double t1 = tanhXdX(s[0]);
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double t2 = tanhXdX(s[1]);
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@ -173,37 +157,40 @@ double zi;
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double f = vcfRC;
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// g# the denominators for solutions of individual stages
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double g0 = 1 / (1 + f*t1), g1 = 1 / (1 + f*t2);
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double g2 = 1 / (1 + f*t3), g3 = 1 / (1 + f*t4);
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double g0 = 1 / (1 + f * t1), g1 = 1 / (1 + f * t2);
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double g2 = 1 / (1 + f * t3), g3 = 1 / (1 + f * t4);
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// f# are just factored out of the feedback solution
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double f3 = f*t3*g3, f2 = f*t2*g2*f3, f1 = f*t1*g1*f2, f0 = f*t0*g0*f1;
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double f3 = f * t3 * g3, f2 = f * t2 * g2 * f3, f1 = f * t1 * g1 * f2, f0 = f * t0 * g0 * f1;
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// solve feedback
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double y3 = (g3*s[3] + f3*g2*s[2] + f2*g1*s[1] + f1*g0*s[0] + f0*out) / (1 + r*f0);
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double y3 = (g3 * s[3] + f3 * g2 * s[2] + f2 * g1 * s[1] + f1 * g0 * s[0] + f0 * out) / (1 + r * f0);
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// then solve the remaining outputs (with the non-linear gains here)
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double xx = t0*((out * (r+1)) - r*y3);
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double y0 = t1*g0*(s[0] + f*xx);
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double y1 = t2*g1*(s[1] + f*y0);
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double y2 = t3*g2*(s[2] + f*y1);
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double xx = t0 * ((out * (r + 1)) - r * y3);
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double y0 = t1 * g0 * (s[0] + f * xx);
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double y1 = t2 * g1 * (s[1] + f * y0);
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double y2 = t3 * g2 * (s[2] + f * y1);
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// update state
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s[0] += 2*f * (xx - y0);
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s[1] += 2*f * (y0 - y1);
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s[2] += 2*f * (y1 - y2);
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s[3] += 2*f * (y2 - t4*y3);
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s[0] += 2 * f * (xx - y0);
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s[1] += 2 * f * (y0 - y1);
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s[2] += 2 * f * (y1 - y2);
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s[3] += 2 * f * (y2 - t4 * y3);
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//out[n] = y3;
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// }
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// out[n] = y3;
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// }
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// out *= 0.1;
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out = y3;
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#else
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for (uint8_t ovs = 0; ovs < 4; ovs++) {
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out *= 0.5;
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for (uint8_t ovs = 0; ovs < 2; ovs++) {
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fb = y3;
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// hard clip
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fb = ((out * 0.5) - fb) * m->res;
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fb = ((out * 0.5) - fb) * r;
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if (fb > 4) fb = 4;
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if (fb < -4) fb = -4;
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// fb = 1.5 * fb - 0.5 * fb * fb * fb;
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@ -216,7 +203,7 @@ double zi;
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}
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#endif
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vcaRC = (amp - vcaRC) * m->vcaTC + vcaRC;
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buffer[i] += 1 * m->vcaBuf[i] * vcaRC * y3;
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buffer[i] += m->vcaBuf[i] * vcaRC * out;
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lastpw = m->pwmBuf[i];
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}
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