#pragma once
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#include <iostream>
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#include <cmath>
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#define PI 3.14159265358979323846
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/**
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* Low Frequency Oscillator Class
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*
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*/
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class LFO
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{
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public:
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/**
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* @brief Contructor
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*
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*/
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LFO();
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/**
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* @brief Constructor
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*
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* Sets waveform type during object declaration
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*
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* @param waveformType Waveform type index
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*/
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LFO(int waveformType);
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/**
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* @brief Prepares object for processing
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*
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* @param sampleRate Current sample rate
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*/
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void prepare(double sampleRate);
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/**
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* @brief Generates and returns the next oscillator sample
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*
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* @param phaseType Oscillator phase
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*/
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double getNextOutputSample(int phaseType);
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/**
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* @brief Sets oscillator waveform type
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*
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* @param waveformType Waveform type index
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*/
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void setWaveformType(int waveformType);
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/**
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* @brief Returns waveform type index
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*/
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int getWaveformType();
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/**
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* @brief Sets oscillation rate
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*
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* @param freq New Rate
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*/
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void setFrequency(double freq);
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/**
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* @brief Returns oscillation rate
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*/
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double getFrequency();
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/**
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* @brief Sets the Sample Rate
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*
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* @param sampleRate New sample rate
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*/
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void setSampleRate(double sampleRate);
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/**
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* @brief Returns the current sample rate the object is operating on
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*/
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double getSampleRate();
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/**
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* @brief Converts unipolar oscilation type to bipolar
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*
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* @param value Value to convert
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*/
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double unipolarToBipolar(double value);
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enum Waveforms
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{
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Triangle = 0,
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Sine,
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Saw
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};
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enum LFOPhase
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{
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Normal = 0,
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Inverted,
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QuadPhase,
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QuadPhaseInverted
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};
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private:
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void generateNextOutputSample();
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// Advabce the mod counter
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void moduloAdvance(double& modCounter, double phaceInc);
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// Check the mod counter and wrap
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void moduloWrap(double& modCounter, double phaceInc);
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// Advance the mod counter and wrap
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void moduloAdvanceAndWrap(double& modCounter, double phaceInc);
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// Parabolic Sine Calculation Function (Angle ragnes from -pi to pi)
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double parabolicSine(double angle);
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// Oscillator Parameters
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double modCounter, modCounter90, phaseInc;
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double frequency {1.0}, sampleRate;
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int waveformType {Waveforms::Sine};
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// Output Values
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double outNormal, outInverted, outQuadPhase, outQuadPhaseInverted;
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};
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