#ifndef MATH_UTIL_H
#define MATH_UTIL_H

#ifndef PI
#define PI							3.14159265358979323846f
#endif

#define DEGTORAD(a)					((a) * (PI/180.0f))
#define RADTODEG(a)					((a) * (180.0f/PI))
#define SQR(x)						((x) * (x))

template <typename T>
T Interpolate(T& a, T& b, float l)
{
	return a + (b - a) * l;
}

template <typename T>
inline T clamp(T value, T min, T max)
{
	if (value <= min) return min;
	else if (value >= max) return max;
	else return value;
}

static inline int RoundUpToPowerOf2(int x)
{
	if ((x & (x-1)) == 0)
		return x;
	int d = x;
	while (d & (d-1))
		d &= (d-1);
	return d << 1;
}

inline float sgn(float a)
{
    if (a > 0.0f) return 1.0f;
    if (a < 0.0f) return -1.0f;
    return 0.0f;
}

#endif