#include "pspmath.h"

// simple ease in/out function
// input will be clamped to range of 0 < t < 1

float vfpu_ease_in_out(float t) {
	float r;
	__asm__ volatile (
		"mtv     %1, S000\n"
		"vmov.q  C000[0:1,,,], C000[x, 2, 1, 1/2]\n"	// C000 = [0<t<1, 2, 1, 1/2]
		"vmul.s  S000, S000, S001\n"				// raise S000 to 0..2 range
		"vsub.s  S000, S000, S002\n"				// S000 now in -1 to 1 range
		"vsin.s  S000, S000\n"						// S000 = sin(S000)
		"vmul.s  S000, S000, S003\n"				// S000 = sin(t)/2
		"vadd.s  S000, S000, S003\n"				// S000 = 0.5 + sin(t)/2
		"mfv     %0, S000\n"
	: "=r"(r) : "r"(t));
	return r;
}