owl_patch 0.8.0

Rust SDK for Rebel Technology Owl2/3 devices
Documentation 
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#ifndef __RampOscillator_h
#define __RampOscillator_h

#include "Oscillator.h"

/**
 * Ramp oscillator generates rising output values from -1 to 1.
 */
class RampOscillator : public OscillatorTemplate<RampOscillator> {
public:
  static constexpr float begin_phase = -1;
  static constexpr float end_phase = 1;
  RampOscillator(){}
  RampOscillator(float sr){
    setSampleRate(sr);
  }  
  float getSample(){
    return phase;
  }
};

/**
 * Inverted ramp oscillator generates falling output values from 1 to -1.
 */
class InvertedRampOscillator : public OscillatorTemplate<InvertedRampOscillator> {
public:
  static constexpr float begin_phase = -1;
  static constexpr float end_phase = 1;
  InvertedRampOscillator(){}
  InvertedRampOscillator(float sr){
    setSampleRate(sr);
  }  
  float getSample(){
    return -phase;
  }
};

class AntialiasedRampOscillator : public OscillatorTemplate<AntialiasedRampOscillator> {
protected:
  float lastblep;
public:
  static constexpr float begin_phase = 0;
  static constexpr float end_phase = 1;
  AntialiasedRampOscillator(){}
  AntialiasedRampOscillator(float sr){
    setSampleRate(sr);
  }  
  void setPhase(float ph){
    lastblep = 0;
    OscillatorTemplate<AntialiasedRampOscillator>::setPhase(ph);
  }
  void reset(){
    lastblep = 0;
    OscillatorTemplate<AntialiasedRampOscillator>::reset();
  }
  float getSample(){
    float sample = 2*phase-1; // naive ramp
    sample -= polyblep(phase, incr);
    return sample;
  }
  /**
   * Note: mixing sample based and block based generate() calls is not supported
   * by this class.
   */
  void generate(FloatArray output){
    size_t len = output.getSize();
    float blep = lastblep;
    for(size_t i=0; i<len; ++i){
      float sample = 2*phase-1;
      sample -= blep;
      phase += incr;
      if(phase >= 1){
	// wrap phase
	phase -= 1;
	// correct current sample
	float t = (phase - incr) / incr;
	sample -= t*t + t+t + 1;
	// correct next sample
	t = phase / incr;
	blep = t+t - t*t - 1;
      }else{
	blep = 0;
      }
      output[i] = sample;
    }
    lastblep = blep; // carry over polyblep correction
  }
  using OscillatorTemplate<AntialiasedRampOscillator>::generate;  
};
  
#endif /* __RampOscillator_h */