Function crossfade

include/math.hpp:157–159

Linearly interpolates between `a` and `b`, from `p = 0` to `p = 1`. */

/** Linearly interpolates between `a` and `b`, from `p = 0` to `p = 1`.
*/
inline float crossfade(float a, float b, float p) {
	return a + (b - a) * p;
}

/** Linearly interpolates an array `p` with index `x`.
The array at `p` must be at least length `floor(x) + 2`.