Added DaisySP

daisysp/Effects/overdrive.cpp

@@ -0,0 +1,32 @@
+#include "dsp.h"
+#include "overdrive.h"
+#include <algorithm>
+
+namespace daisysp
+{
+void Overdrive::Init()
+{
+    SetDrive(.5f);
+}
+
+float Overdrive::Process(float in)
+{
+    float pre = pre_gain_ * in;
+    return SoftClip(pre) * post_gain_;
+}
+
+void Overdrive::SetDrive(float drive)
+{
+    drive  = fclamp(drive, 0.f, 1.f);
+    drive_ = 2.f * drive;
+
+    const float drive_2    = drive_ * drive_;
+    const float pre_gain_a = drive_ * 0.5f;
+    const float pre_gain_b = drive_2 * drive_2 * drive_ * 24.0f;
+    pre_gain_              = pre_gain_a + (pre_gain_b - pre_gain_a) * drive_2;
+
+    const float drive_squashed = drive_ * (2.0f - drive_);
+    post_gain_ = 1.0f / SoftClip(0.33f + drive_squashed * (pre_gain_ - 0.33f));
+}
+
+} // namespace daisysp