Added DaisySP

daisysp/Synthesis/oscillatorbank.h

@@ -0,0 +1,88 @@
+/*
+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_OSCILLATORBANK_H
+#define DSY_OSCILLATORBANK_H
+
+#include <stdint.h>
+#ifdef __cplusplus
+
+/** @file oscillatorbank.h */
+
+namespace daisysp
+{
+/**  
+       @brief Oscillator Bank module.
+       @author Ben Sergentanis
+       @date Dec 2020 
+       A mixture of 7 sawtooth and square waveforms in the style of divide-down organs \n \n
+       Ported from pichenettes/eurorack/plaits/dsp/oscillator/string_synth_oscillator.h \n 
+       \n to an independent module. \n
+       Original code written by Emilie Gillet in 2016. \n
+*/
+
+class OscillatorBank
+{
+  public:
+    OscillatorBank() {}
+    ~OscillatorBank() {}
+
+    /** Init string synth module
+        \param sample_rate Audio engine sample rate
+    */
+    void Init(float sample_rate);
+
+    /** Get next floating point sample 
+    */
+    float Process();
+
+    /** Set oscillator frequency (8' oscillator)
+        \param freq Frequency in Hz
+    */
+    void SetFreq(float freq);
+
+    /** Set amplitudes of 7 oscillators. 0-6 are Saw 8', Square 8', Saw 4', Square 4', Saw 2', Square 2', Saw 1'
+        \param amplitudes array of 7 floating point amplitudes. Must sum to 1.
+    */
+    void SetAmplitudes(const float* amplitudes);
+
+    /** Set a single amplitude
+        \param amp Amplitude to set.
+        \param idx Which wave's amp to set
+    */
+    void SetSingleAmp(float amp, int idx);
+
+    /** Set overall gain.
+        \param gain Gain to set. 0-1.
+    */
+    void SetGain(float gain);
+
+  private:
+    // Oscillator state.
+    float phase_;
+    float next_sample_;
+    int   segment_;
+    float gain_;
+    float registration_[7];
+    float unshifted_registration_[7];
+
+    float frequency_;
+    float saw_8_gain_;
+    float saw_4_gain_;
+    float saw_2_gain_;
+    float saw_1_gain_;
+
+    float sample_rate_;
+    bool  recalc_, recalc_gain_;
+
+    bool cmp(float a, float b) { return fabsf(a - b) > .0000001; }
+};
+} // namespace daisysp
+#endif
+#endif