Added DaisySP

2026-04-24 14:46:05 +02:00
parent 82190216c3
commit dd63b3aed4
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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
+
+/** @file fractal_noise.h */
+
+namespace daisysp
+{
+/**  
+       @brief Fractal Noise, stacks octaves of a noise source.
+       @author Ported by Ben Sergentanis 
+       @date Jan 2021 
+       T is the noise source to use. T must have SetFreq() and Init(sample_rate) functions. \n
+       Order is the number of noise sources to stack. \n \n
+       Ported from pichenettes/eurorack/plaits/dsp/noise/fractal_random_generator.h \n
+       to an independent module. \n
+       Original code written by Emilie Gillet in 2016. \n
+       
+*/
+template <typename T, int order>
+class FractalRandomGenerator
+{
+  public:
+    FractalRandomGenerator() {}
+    ~FractalRandomGenerator() {}
+
+    /** Initialize the module
+        \param sample_rate Audio engine sample rate.
+    */
+    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_);
+        }
+    }
+
+    /** Get the next sample. */
+    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;
+    }
+
+    /** Set the lowest noise frequency.
+        \param freq Frequency of the lowest noise source in Hz.
+    */
+    void SetFreq(float freq) { frequency_ = fclamp(freq, 0.f, sample_rate_); }
+
+    /** Sets the amount of high frequency noise.
+        \** Works 0-1. 1 is the brightest, and 0 is the darkest.
+    */
+    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