Added DaisySP

daisysp/Noise/particle.h

@@ -0,0 +1,92 @@
+#pragma once
+#ifndef DSY_PARTICLE_H
+#define DSY_PARTICLE_H
+
+#include "Filters/svf.h"
+#include <stdint.h>
+#include <cstdlib>
+#ifdef __cplusplus
+
+/** @file particle.h */
+
+namespace daisysp
+{
+/**  
+       @brief Random impulse train processed by a resonant filter.
+       @author Ported by Ben Sergentanis 
+       @date Jan 2021 
+       Noise processed by a sample and hold running at a target frequency. \n \n
+       Ported from pichenettes/eurorack/plaits/dsp/noise/particle.h \n
+       to an independent module. \n
+       Original code written by Emilie Gillet in 2016. \n
+*/
+class Particle
+{
+  public:
+    Particle() {}
+    ~Particle() {}
+
+    /** Initialize the module
+        \param sample_rate Audio engine sample rate.
+    */
+    void Init(float sample_rate);
+
+    /** Get the next sample */
+    float Process();
+
+    /** Get the raw noise output. Must call Process() first. */
+    float GetNoise();
+
+    /** Set the resonant filter frequency
+        \param freq Frequency in Hz
+    */
+    void SetFreq(float frequency);
+
+    /** Set the filter resonance
+        \param resonance Works 0-1
+    */
+    void SetResonance(float resonance);
+
+    /** How often to randomize filter frequency
+        \param freq Frequency in Hz.
+    */
+    void SetRandomFreq(float freq);
+
+    /** Noise density
+        \param Works 0-1.
+    */
+    void SetDensity(float density);
+
+    /** Overall module gain
+        \param Works 0-1.
+    */
+    void SetGain(float gain);
+
+    /** How much to randomize the set filter frequency.
+        \param spread Works over positive numbers.
+    */
+    void SetSpread(float spread);
+
+    /** Force randomize the frequency.
+        \param sync True to randomize freq.
+    */
+    void SetSync(bool sync);
+
+  private:
+    static constexpr float kRandFrac  = 1.f / (float)RAND_MAX;
+    static constexpr float kRatioFrac = 1.f / 12.f;
+    float                  sample_rate_;
+    float aux_, frequency_, density_, gain_, spread_, resonance_;
+    bool  sync_;
+
+
+    float rand_phase_;
+    float rand_freq_;
+
+
+    float pre_gain_;
+    Svf   filter_;
+};
+} // namespace daisysp
+#endif
+#endif