80 lines
1.8 KiB
C++
80 lines
1.8 KiB
C++
/*
|
|
Copyright (c) 2020 Electrosmith, Corp, Emilie Gillet
|
|
|
|
Use of this source code is governed by an MIT-style
|
|
license that can be found in the LICENSE file or at
|
|
https://opensource.org/licenses/MIT.
|
|
*/
|
|
|
|
#pragma once
|
|
#ifndef DSY_VARISAWOSCILLATOR_H
|
|
#define DSY_VARISAWOSCILLATOR_H
|
|
|
|
#include <stdint.h>
|
|
#ifdef __cplusplus
|
|
|
|
/** @file variablesawosc.h */
|
|
namespace daisysp
|
|
{
|
|
/**
|
|
@brief Variable Saw Oscillator.
|
|
@author Ben Sergentanis
|
|
@date Dec 2020
|
|
Saw with variable slope or notch. \n \n
|
|
Ported from pichenettes/eurorack/plaits/dsp/oscillator/variable_saw_oscillator.h \n
|
|
\n to an independent module. \n
|
|
Original code written by Emilie Gillet in 2016. \n
|
|
*/
|
|
class VariableSawOscillator
|
|
{
|
|
public:
|
|
VariableSawOscillator() {}
|
|
~VariableSawOscillator() {}
|
|
|
|
void Init(float sample_rate);
|
|
|
|
/** Get the next sample */
|
|
float Process();
|
|
|
|
/** Set master freq.
|
|
\param frequency Freq in Hz.
|
|
*/
|
|
void SetFreq(float frequency);
|
|
|
|
/** Adjust the wave depending on the shape
|
|
\param pw Notch or slope. Works best -1 to 1.
|
|
*/
|
|
void SetPW(float pw);
|
|
|
|
/** Slope or notch
|
|
\param waveshape 0 = notch, 1 = slope
|
|
*/
|
|
void SetWaveshape(float waveshape);
|
|
|
|
|
|
private:
|
|
float ComputeNaiveSample(float phase,
|
|
float pw,
|
|
float slope_up,
|
|
float slope_down,
|
|
float triangle_amount,
|
|
float notch_amount);
|
|
|
|
float sample_rate_;
|
|
|
|
// Oscillator state.
|
|
float phase_;
|
|
float next_sample_;
|
|
float previous_pw_;
|
|
bool high_;
|
|
|
|
const float kVariableSawNotchDepth = 0.2f;
|
|
|
|
// For interpolation of parameters.
|
|
float frequency_;
|
|
float pw_;
|
|
float waveshape_;
|
|
};
|
|
} // namespace daisysp
|
|
#endif
|
|
#endif |