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libraries/FastLED/examples/LuminescentGrand/shared/util.h

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+#ifndef UTIL_H_
+#define UTIL_H_
+
+#include <stdint.h>
+
+#include "./ApproximatingFunction.h"
+#include "./settings.h"
+
+#ifndef round
+#define round(x) ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))
+#endif  // round
+
+/*
+// C - 0, C# - 1, D - 2, D# - 3... B - 11.
+// http://cote.cc/w/wp-content/uploads/drupal/blog/logic-midi-note-numbers.png
+*/
+uint8_t FundamentalNote(int midi_note);
+
+float mapf(float x, float in_min, float in_max, float out_min, float out_max);
+
+// Given an input time. 
+float AttackRemapFactor(uint32_t delta_t_ms);
+
+float MapDecayTime(uint8_t key_idx);
+
+// Returns a value in the range 1->0 indicating how intense the note is. This
+// value will go to 0 as time progresses, and will be 1 when the note is first
+// pressed.
+float CalcDecayFactor(bool sustain_pedal_on,
+                      bool key_on,
+                      int key_idx,
+                      float velocity,
+                      bool dampened_key,
+                      float time_elapsed_ms);
+
+float ToBrightness(int velocity);
+
+#endif  // UTIL_H_