init

Source/DSP/LFO.h

@@ -0,0 +1,54 @@
+#pragma once
+#include <cmath>
+
+enum class LFODest { FilterCutoff = 0, OSC1Freq, OSC2Freq, BothOsc };
+enum class LFOShape { Sine = 0, Triangle, Saw, Square };
+
+class LFO {
+public:
+    void prepare(double sr) { sampleRate = sr; }
+
+    void setParameters(float rate, float depth, LFOShape s, LFODest d) {
+        lfoRate = rate;
+        lfoDepth = depth;
+        shape = s;
+        dest = d;
+    }
+
+    float getNextSample() {
+        float twoPi = 6.2831853f;
+        phase += lfoRate / static_cast<float>(sampleRate);
+        if (phase >= 1.0f) phase -= 1.0f;
+
+        float out = 0.0f;
+        float p = phase;
+
+        switch (shape) {
+            case LFOShape::Sine:
+                out = std::sin(p * twoPi);
+                break;
+            case LFOShape::Triangle:
+                out = 2.0f * std::abs(2.0f * (p - 0.5f)) - 1.0f;
+                break;
+            case LFOShape::Saw:
+                out = 2.0f * p - 1.0f;
+                break;
+            case LFOShape::Square:
+                out = p < 0.5f ? 1.0f : -1.0f;
+                break;
+        }
+
+        return out * lfoDepth;
+    }
+
+    LFODest getDest() const { return dest; }
+    void reset() { phase = 0.0f; }
+
+private:
+    double sampleRate = 44100.0;
+    float phase = 0.0f;
+    float lfoRate = 2.0f;
+    float lfoDepth = 0.0f;
+    LFOShape shape = LFOShape::Sine;
+    LFODest dest = LFODest::FilterCutoff;
+};