anki-3d-engine/include/anki/math/Math.h

#ifndef ANKI_MATH_MATH_H
#define ANKI_MATH_MATH_H

#include "anki/math/MathCommonIncludes.h"


namespace anki {


/// @addtogroup Math
/// @{

/// Useful and optimized math functions
class Math
{
public:
	static const float PI;
	static const float EPSILON;

	/// A fast func that given the angle in rads it returns the sin and cos
	static void sinCos(const float rad, float& sin_, float& cos_);

	/// Optimized square root
	static float sqrt(const float f);

	/// Convert
	static float toRad(const float degrees);

	/// Convert
	static float toDegrees(const float rad);

	/// Optimized sine
	static float sin(const float rad);

	/// Optimized cosine
	static float cos(const float rad);

	/// The proper way to test if a float is zero
	static bool isZero(const float f);

	/// Mat4(t0,r0,s0) * Mat4(t1, r1, s1) == Mat4(tf, rf, sf)
	static void combineTransformations(
		const Vec3& t0, const Mat3& r0, const float s0, // in 0
		const Vec3& t1, const Mat3& r1, const float s1, // in 1
		Vec3& tf, Mat3& rf, float& sf); // out

	/// Mat4(t0, r0, 1.0) * Mat4(t1, r1, 1.0) == Mat4(tf, rf, sf)
	static void combineTransformations(
		const Vec3& t0, const Mat3& r0, // in 0
		const Vec3& t1, const Mat3& r1, // in 1
		Vec3& tf, Mat3& rf); // out

private:
	static float polynomialSinQuadrant(const float a);
};
/// @}


} // end namespace


#include "anki/math/Math.inl.h"


#endif