Added input processing to state

state.h

@@ -1,7 +1,9 @@
 #pragma once
 
-#include <stdint.h>
 #include <stdbool.h>
+#include <stdint.h>
+#include <math.h>
+
 #include "input.h"
 #include "vco.h"
 
@@ -25,5 +27,17 @@ typedef struct {
 	bool		amen_enabled;
 } state_t;
 
+static inline float map_linear(float v, float min, float max) {
+	return min + v * (max - min);
+}
+
+static inline float map_exponential(float v, float min, float max) {
+	return min + powf(max / min, v);
+}
+
+static inline float map_squared(float v, float min, float max) {
+	return min + (v * v) * (max - min);
+}
+
 void update_state(state_t* state, input_t* input);