Added DaisySP

daisysp/Synthesis/fm2.h

@@ -0,0 +1,73 @@
+/*
+Copyright (c) 2020 Electrosmith, Corp
+
+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_FM2_H
+#define DSY_FM2_H
+
+#include <stdint.h>
+#include "Synthesis/oscillator.h"
+#ifdef __cplusplus
+
+namespace daisysp
+{
+/** Simple 2 operator FM synth voice.
+     
+    Date: November, 2020
+
+    Author: Ben Sergentanis
+*/
+
+class Fm2
+{
+  public:
+    Fm2() {}
+    ~Fm2() {}
+
+    /** Initializes the FM2 module.
+        \param samplerate - The sample rate of the audio engine being run. 
+    */
+    void Init(float samplerate);
+
+
+    /**  Returns the next sample
+    */
+    float Process();
+
+    /** Carrier freq. setter
+        \param freq Carrier frequency in Hz
+    */
+    void SetFrequency(float freq);
+
+    /** Set modulator freq. relative to carrier
+        \param ratio New modulator freq = carrier freq. * ratio
+    */
+    void SetRatio(float ratio);
+
+    /** Index setter
+      \param FM depth, 5 = 2PI rads
+  */
+    void SetIndex(float index);
+
+    /** Returns the current FM index. */
+    float GetIndex();
+
+    /** Resets both oscillators */
+    void Reset();
+
+  private:
+    static constexpr float kIdxScalar      = 0.2f;
+    static constexpr float kIdxScalarRecip = 1.f / kIdxScalar;
+
+    Oscillator mod_, car_;
+    float      idx_;
+    float      freq_, lfreq_, ratio_, lratio_;
+};
+} // namespace daisysp
+#endif
+#endif