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Fundamental
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Update indentation

tags/v1.0.1
Ivan COHEN GitHub 7 years ago
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1 changed files with 128 additions and 133 deletions
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      src/VCF.cpp

+ 128
- 133
src/VCF.cpp View File

@@ -18,157 +18,152 @@
// The clipping function of a transistor pair is approximately tanh(x)
// This one is a Pade-approx for tanh(sqrt(x))/sqrt(x)
inline float clip(float x) {
float a = x*x;
return ((a + 105)*a + 945) / ((15*a + 420)*a + 945);
float a = x*x;
return ((a + 105)*a + 945) / ((15*a + 420)*a + 945);
}

struct LadderFilter {
float g = 0.1f;
float resonance = 0.5f;
float state[4] = {};
float zi = 0.f;
float output[3] = {};

void process(float input) {
// input with half delay, for non-linearities
const float ih = 0.5f * (input + zi);

// evaluate the non-linear gains
const float t0 = g * clip(ih - resonance * state[3]);
const float t1 = g * clip(state[0]);
const float t2 = g * clip(state[1]);
const float t3 = g * clip(state[2]);
const float t4 = g * clip(state[3]);

// update last LP1 output
const float t2t3 = t2*t3;
float y3 = (s[3]*(1+t3) + s[2]*t3)*(1+t2);
y3 = (y3 + t2t3*s[1])*(1+t1);
y3 = (y3 + t1*t2t3*(s[0]+t0*input));
y3 = y3 / ((1+t1)*(1+t2)*(1+t3)*(1+t4) + resonance*t0*t1*t2t3);

// update other LP1 outputs
const float xx = t0 * (input - resonance * y3);
const float y0 = t1 * (s[0] + xx) / (1+t1);
const float y1 = t2 * (s[1] + y0) / (1+t2);
const float y2 = t3 * (s[2] + y1) / (1+t3);

// update states
s[0] += 2 * (xx - y0);
s[1] += 2 * (y0 - y1);
s[2] += 2 * (y1 - y2);
s[3] += 2 * (y2 - t4*y3);

// returns LP, HP and BP outputs
float y1t2 = y1/t2;
float y2t3 = y2/t3;
output[0] = y3;
output[1] = xx/t0 - 4*y0/t1 + 6*y1t2 - 4*y2t3 + y3;
output[2] = y1t2 - 2*y2t3 + y3;

// update delay input state
zi = input;
}

void reset() {
for (int i = 0; i < 4; i++) {
state[i] = 0.0f;
}
zi = 0.f;
}
float g = 0.1f;
float resonance = 0.5f;
float state[4] = {};
float zi = 0.f;
float output[3] = {};

void process(float input) {
// input with half delay, for non-linearities
const float ih = 0.5f * (input + zi);

// evaluate the non-linear gains
const float t0 = g * clip(ih - resonance * state[3]);
const float t1 = g * clip(state[0]);
const float t2 = g * clip(state[1]);
const float t3 = g * clip(state[2]);
const float t4 = g * clip(state[3]);

// update last LP1 output
float y3 = (s[3]*(1+t3) + s[2]*t3)*(1+t2);
y3 = (y3 + t2*t3*s[1])*(1+t1);
y3 = (y3 + t1*t2*t3*(s[0]+t0*input));
y3 = y3 / ((1+t1)*(1+t2)*(1+t3)*(1+t4) + resonance*t0*t1*t2*t3);

// update other LP1 outputs
const float xx = t0 * (input - resonance * y3);
const float y0 = t1 * (s[0] + xx) / (1+t1);
const float y1 = t2 * (s[1] + y0) / (1+t2);
const float y2 = t3 * (s[2] + y1) / (1+t3);

// update states
s[0] += 2 * (xx - y0);
s[1] += 2 * (y0 - y1);
s[2] += 2 * (y1 - y2);
s[3] += 2 * (y2 - t4*y3);

// returns LP, HP and BP outputs
output[0] = y3;
output[1] = xx/t0 - 4*y0/t1 + 6*y1/t2 - 4*y2/t3 + y3;
output[2] = y1/t2 - 2*y2/t3 + y3;

// update delay input state
zi = input;
}

void reset() {
for (int i = 0; i < 4; i++) {
state[i] = 0.0f;
}
zi = 0.f;
}
};


struct VCF : Module {
enum ParamIds {
FREQ_PARAM,
FINE_PARAM,
RES_PARAM,
FREQ_CV_PARAM,
DRIVE_PARAM,
NUM_PARAMS
};
enum InputIds {
FREQ_INPUT,
RES_INPUT,
DRIVE_INPUT,
IN_INPUT,
NUM_INPUTS
};
enum OutputIds {
LPF_OUTPUT,
HPF_OUTPUT,
NUM_OUTPUTS
};
LadderFilter filter;
VCF() : Module(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS) {}
void step() override;
void onReset() override {
filter.reset();
}
enum ParamIds {
FREQ_PARAM,
FINE_PARAM,
RES_PARAM,
FREQ_CV_PARAM,
DRIVE_PARAM,
NUM_PARAMS
};
enum InputIds {
FREQ_INPUT,
RES_INPUT,
DRIVE_INPUT,
IN_INPUT,
NUM_INPUTS
};
enum OutputIds {
LPF_OUTPUT,
HPF_OUTPUT,
NUM_OUTPUTS
};
LadderFilter filter;
VCF() : Module(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS) {}
void step() override;
void onReset() override {
filter.reset();
}
};


void VCF::step() {
float input = inputs[IN_INPUT].value / 5.0f;
float drive = params[DRIVE_PARAM].value + inputs[DRIVE_INPUT].value / 10.0f;
float gain = powf(100.0f, drive);
input *= gain;
// Add -60dB noise to bootstrap self-oscillation
input += 1e-6f * (2.0f*randomUniform() - 1.0f);
// Set resonance
float res = params[RES_PARAM].value + inputs[RES_INPUT].value / 5.0f;
res = clamp(res, 0.0f, 1.0f); // resonance must be between 0 and 1
filter.resonance = res;
// Set cutoff frequency
float cutoffExp = params[FREQ_PARAM].value + params[FREQ_CV_PARAM].value * inputs[FREQ_INPUT].value / 5.0f;
cutoffExp = clamp(cutoffExp, 0.0f, 1.0f);
const float minCutoff = 15.0f;
const float maxCutoff = 20000.0f;
float cutoff = minCutoff * powf(maxCutoff / minCutoff, cutoffExp);
filter.g = tanf(float_Pi * cutoff / engineGetSampleRate());
// Push a sample to the state filter
filter.process(input);
// Set outputs
outputs[LPF_OUTPUT].value = 5.0f * filter.output[0];
outputs[HPF_OUTPUT].value = 5.0f * filter.output[1];
//outputs[BPF_OUTPUT].value = 5.0f * filter.output[2];
float input = inputs[IN_INPUT].value / 5.0f;
float drive = params[DRIVE_PARAM].value + inputs[DRIVE_INPUT].value / 10.0f;
float gain = powf(100.0f, drive);
input *= gain;
// Add -60dB noise to bootstrap self-oscillation
input += 1e-6f * (2.0f*randomUniform() - 1.0f);
// Set resonance
float res = params[RES_PARAM].value + inputs[RES_INPUT].value / 5.0f;
res = clamp(res, 0.0f, 1.0f); // resonance must be between 0 and 1
filter.resonance = res;
// Set cutoff frequency
float cutoffExp = params[FREQ_PARAM].value + params[FREQ_CV_PARAM].value * inputs[FREQ_INPUT].value / 5.0f;
cutoffExp = clamp(cutoffExp, 0.0f, 1.0f);
const float minCutoff = 15.0f;
const float maxCutoff = 20000.0f;
float cutoff = minCutoff * powf(maxCutoff / minCutoff, cutoffExp);
filter.g = tanf(float_Pi * cutoff / engineGetSampleRate());
// Push a sample to the state filter
filter.process(input);
// Set outputs
outputs[LPF_OUTPUT].value = 5.0f * filter.output[0];
outputs[HPF_OUTPUT].value = 5.0f * filter.output[1];
//outputs[BPF_OUTPUT].value = 5.0f * filter.output[2];
}


struct VCFWidget : ModuleWidget {
VCFWidget(VCF *module);
VCFWidget(VCF *module);
};

VCFWidget::VCFWidget(VCF *module) : ModuleWidget(module) {
setPanel(SVG::load(assetPlugin(plugin, "res/VCF.svg")));
addChild(Widget::create<ScrewSilver>(Vec(15, 0)));
addChild(Widget::create<ScrewSilver>(Vec(box.size.x-30, 0)));
addChild(Widget::create<ScrewSilver>(Vec(15, 365)));
addChild(Widget::create<ScrewSilver>(Vec(box.size.x-30, 365)));
addParam(ParamWidget::create<RoundHugeBlackKnob>(Vec(33, 61), module, VCF::FREQ_PARAM, 0.0f, 1.0f, 0.5f));
addParam(ParamWidget::create<RoundLargeBlackKnob>(Vec(12, 143), module, VCF::FINE_PARAM, 0.0f, 1.0f, 0.5f));
addParam(ParamWidget::create<RoundLargeBlackKnob>(Vec(71, 143), module, VCF::RES_PARAM, 0.0f, 1.0f, 0.0f));
addParam(ParamWidget::create<RoundLargeBlackKnob>(Vec(12, 208), module, VCF::FREQ_CV_PARAM, -1.0f, 1.0f, 0.0f));
addParam(ParamWidget::create<RoundLargeBlackKnob>(Vec(71, 208), module, VCF::DRIVE_PARAM, 0.0f, 1.0f, 0.0f));
addInput(Port::create<PJ301MPort>(Vec(10, 276), Port::INPUT, module, VCF::FREQ_INPUT));
addInput(Port::create<PJ301MPort>(Vec(48, 276), Port::INPUT, module, VCF::RES_INPUT));
addInput(Port::create<PJ301MPort>(Vec(85, 276), Port::INPUT, module, VCF::DRIVE_INPUT));
addInput(Port::create<PJ301MPort>(Vec(10, 320), Port::INPUT, module, VCF::IN_INPUT));
addOutput(Port::create<PJ301MPort>(Vec(48, 320), Port::OUTPUT, module, VCF::LPF_OUTPUT));
addOutput(Port::create<PJ301MPort>(Vec(85, 320), Port::OUTPUT, module, VCF::HPF_OUTPUT));
setPanel(SVG::load(assetPlugin(plugin, "res/VCF.svg")));
addChild(Widget::create<ScrewSilver>(Vec(15, 0)));
addChild(Widget::create<ScrewSilver>(Vec(box.size.x-30, 0)));
addChild(Widget::create<ScrewSilver>(Vec(15, 365)));
addChild(Widget::create<ScrewSilver>(Vec(box.size.x-30, 365)));
addParam(ParamWidget::create<RoundHugeBlackKnob>(Vec(33, 61), module, VCF::FREQ_PARAM, 0.0f, 1.0f, 0.5f));
addParam(ParamWidget::create<RoundLargeBlackKnob>(Vec(12, 143), module, VCF::FINE_PARAM, 0.0f, 1.0f, 0.5f));
addParam(ParamWidget::create<RoundLargeBlackKnob>(Vec(71, 143), module, VCF::RES_PARAM, 0.0f, 1.0f, 0.0f));
addParam(ParamWidget::create<RoundLargeBlackKnob>(Vec(12, 208), module, VCF::FREQ_CV_PARAM, -1.0f, 1.0f, 0.0f));
addParam(ParamWidget::create<RoundLargeBlackKnob>(Vec(71, 208), module, VCF::DRIVE_PARAM, 0.0f, 1.0f, 0.0f));
addInput(Port::create<PJ301MPort>(Vec(10, 276), Port::INPUT, module, VCF::FREQ_INPUT));
addInput(Port::create<PJ301MPort>(Vec(48, 276), Port::INPUT, module, VCF::RES_INPUT));
addInput(Port::create<PJ301MPort>(Vec(85, 276), Port::INPUT, module, VCF::DRIVE_INPUT));
addInput(Port::create<PJ301MPort>(Vec(10, 320), Port::INPUT, module, VCF::IN_INPUT));
addOutput(Port::create<PJ301MPort>(Vec(48, 320), Port::OUTPUT, module, VCF::LPF_OUTPUT));
addOutput(Port::create<PJ301MPort>(Vec(85, 320), Port::OUTPUT, module, VCF::HPF_OUTPUT));
}




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