New led control

espmusicmouse/lib/ledtl/helpers/BellCurve.h

@@ -0,0 +1,17 @@
+#include <cstdint>
+
+static inline float bellCurveApproximation(float x, float inverseWidth)
+{
+  if (x < 0)
+    x = -x;
+
+  const auto nx = x * inverseWidth * 4;
+  if (nx > 2)
+    return 0.0f;
+
+  const auto x2 = nx * nx;
+  const auto x3 = x2 * nx;
+  const auto res = 1.0f + 0.27606958941084f * x3 - 0.80213917882168f * x2;
+
+  return res < 0.0f ? 0.0f : res;
+}

espmusicmouse/lib/ledtl/helpers/ColorRGBW.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <cstdint>
+
+struct ColorRGBW
+{
+  uint8_t r, g, b, w;
+
+  ColorRGBW operator*(float s) const
+  {
+    return {uint8_t(s * r),
+            uint8_t(s * g),
+            uint8_t(s * b),
+            uint8_t(s * w)};
+  }
+};