fractal_noise.h

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/*
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_FRACTAL_H
#define DSY_FRACTAL_H
 
#include <stdint.h>
#ifdef __cplusplus
 
namespace daisysp
{
template <typename T, int order>
class FractalRandomGenerator
{
  public:
    FractalRandomGenerator() {}
    ~FractalRandomGenerator() {}
 
    void Init(float sample_rate)
    {
        sample_rate_ = sample_rate;
 
        SetColor(.5f);
        SetFreq(440.f);
        for(int i = 0; i < order; ++i)
        {
            generator_[i].Init(sample_rate_);
        }
    }
 
    float Process()
    {
        float gain      = 0.5f;
        float sum       = 0.0f;
        float frequency = frequency_;
 
        for(int i = 0; i < order; ++i)
        {
            generator_[i].SetFreq(frequency);
            sum += generator_[i].Process() * gain;
            gain *= decay_;
            frequency *= 2.0f;
        }
 
        return sum;
    }
 
    void SetFreq(float freq) { frequency_ = fclamp(freq, 0.f, sample_rate_); }
 
    void SetColor(float color) { decay_ = fclamp(color, 0.f, 1.f); }
 
  private:
    float sample_rate_;
    float frequency_;
    float decay_;
 
    T generator_[order];
};
} // namespace daisysp
#endif
#endif