Prototype

Source/dsp/WaveTables.h

@@ -2,6 +2,7 @@
 
 #include <cmath>
 #include <algorithm>
+#include <random>
 
 namespace monostep
 {
@@ -11,7 +12,11 @@ enum class Waveform : int
     sine = 0,
     triangle = 1,
     saw = 2,
-    square = 3
+    square = 3,
+    pulse = 4,
+    noise = 5,
+    sub = 6,
+    pluck = 7
 };
 
 inline float frac (float x)
@@ -63,6 +68,31 @@ inline float renderWave (Waveform w, float phase, float inc)
             v -= polyBlep (frac (f + 0.5f), inc);
             return v;
         }
+
+        case Waveform::pulse:
+        {
+            const float f = frac (phase);
+            return (f < 0.3f) ? 1.0f : -1.0f;
+        }
+
+        case Waveform::sub:
+        {
+            const float f = frac (phase * 0.25f);
+            return 4.0f * std::min (f, 1.0f - f) - 1.0f;
+        }
+
+        case Waveform::noise:
+        {
+            thread_local static std::mt19937 rng { std::random_device {}() };
+            thread_local static std::uniform_real_distribution<float> dist (-1.0f, 1.0f);
+            return dist (rng);
+        }
+
+        case Waveform::pluck:
+        {
+            const float f = frac (phase);
+            return 2.0f * std::sin (f * 6.283185307179586f * 2.0f) * std::exp (-10.0f * f);
+        }
     }
 
     return 0.0f;