RSAlgorithmicVerb/Source/LFO.cpp at main · reillypascal/RSAlgorithmicVerb · GitHub

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// Sine/tri/saw LFO with quadrature output

#include "LFO.h"

LFO::LFO()

{

srand(static_cast<uint32_t>(time(NULL)));

}

LFO::~LFO() = default;

bool LFO::reset(double _sampleRate)

{

sampleRate = _sampleRate;

phaseInc = lfoParameters.frequency_Hz / sampleRate;

modCounter = 0.0;

modCounterQP = 0.25;

return true;

}

OscillatorParameters LFO::getParameters()

{

return lfoParameters;

}

void LFO::setParameters(const OscillatorParameters& params)

{

if (params.frequency_Hz != lfoParameters.frequency_Hz)

phaseInc = params.frequency_Hz / sampleRate;

lfoParameters = params;

}

const SignalGenData LFO::renderAudioOutput()

{

checkAndWrapModulo(modCounter, phaseInc);

modCounterQP = modCounter;

advanceAndCheckWrapModulo(modCounterQP, 0.25);

SignalGenData output;

if (lfoParameters.waveform == generatorWaveform::sin)

{

double angle = modCounter * 2.0 * M_PI - M_PI;

// output.normalOutput = parabolicSine(-angle);

output.normalOutput = std::sin(-angle);

angle = modCounterQP * 2.0 * M_PI - M_PI;

// output.quadPhaseOutput_pos = parabolicSine(-angle);

output.quadPhaseOutput_pos = std::sin(-angle);

}

else if (lfoParameters.waveform == generatorWaveform::triangle)

{

// bipolar saw

output.normalOutput = unipolarToBipolar(modCounter);

// bipolar triangle from saw

output.normalOutput = 2.0 * fabs(output.normalOutput) - 1.0;

output.quadPhaseOutput_pos = unipolarToBipolar(modCounterQP);

output.quadPhaseOutput_pos = 2.0 * fabs(output.quadPhaseOutput_pos) - 1.0;

}

else if (lfoParameters.waveform == generatorWaveform::saw)

{

output.normalOutput = unipolarToBipolar(modCounter);

output.quadPhaseOutput_pos = unipolarToBipolar(modCounterQP);

}

output.quadPhaseOutput_neg = -output.quadPhaseOutput_pos;

output.invertedOutput = -output.normalOutput;

advanceModulo(modCounter, phaseInc);

return output;

}

inline bool LFO::checkAndWrapModulo(double& moduloCounter, double phaseInc)

{

if (phaseInc > 0 && moduloCounter >= 1.0)

{

moduloCounter -= 1.0;

return true;

}

if (phaseInc < 0 && moduloCounter <= 0.0)

{

moduloCounter += 1.0;

return true;

}

return false;

}

inline bool LFO::advanceAndCheckWrapModulo(double& moduloCounter, double phaseInc)

{

moduloCounter += phaseInc;

if (phaseInc > 0 && moduloCounter >= 1.0)

{

moduloCounter -= 1.0;

return true;

}

if (phaseInc < 0 && moduloCounter >= 1.0)

{

moduloCounter += 1.0;

return true;

}

return false;

}

inline void LFO::advanceModulo(double& moduloCounter, double phaseInc)

{

moduloCounter += phaseInc;

}

inline double LFO::parabolicSine(double angle)

{

double y = B * angle + C * angle * fabs(angle);

y = P * (y * fabs(y) - y) + y;

return y;

}

RSAlgorithmicVerb/Source/LFO.cpp at main · reillypascal/RSAlgorithmicVerb · GitHub

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