Added DaisySP

daisysp/Noise/whitenoise.h

@@ -0,0 +1,54 @@
+/*
+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_WHITENOISE_H
+#define DSY_WHITENOISE_H
+#include <stdint.h>
+#ifdef __cplusplus
+namespace daisysp
+{
+/** fast white noise generator
+
+    I think this came from musicdsp.org at some point
+*/
+class WhiteNoise
+{
+  public:
+    WhiteNoise() {}
+    ~WhiteNoise() {}
+    /** Initializes the WhiteNoise object
+    */
+    void Init()
+    {
+        amp_      = 1.0f;
+        randseed_ = 1;
+    }
+
+    /** sets the amplitude of the noise output
+    */
+    inline void SetAmp(float a) { amp_ = a; }
+    /** returns a new sample of noise in the range of -amp_ to amp_
+    */
+    inline float Process()
+    {
+        randseed_ *= 16807;
+        return (randseed_ * coeff_) * amp_;
+    }
+
+    /** sets the seed (and corrects a seed of 0 to 1) */
+    inline void SetSeed(int32_t s) { randseed_ = s == 0 ? 1 : s; }
+
+  private:
+    static constexpr float coeff_ = 4.6566129e-010f;
+    float                  amp_;
+    int32_t                randseed_;
+};
+} // namespace daisysp
+#endif
+#endif