/* -----------------------------------------------------------------------------
	GSFramework
	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
----------------------------------------------------------------------------- */


#ifndef	__NMATH__
#define	__NMATH__


		#include "unit/nunit.h"


/*
	@short	Math namespace.
	@author	Emmanuel Julien (ejulien@gsworks.fr)
*/
namespace GS {
	namespace Math {

static	const float	Pi = 3.1415926535f;

		/// Euler angles rotation order.
enum	rOrder
{
	rOrder_ZYX = 0,
	rOrder_YZX,
	rOrder_ZXY,
	rOrder_XZY,
	rOrder_YXZ,
	rOrder_XYZ,
	rOrder_XY,

	rOrder_Default = rOrder_YXZ		// Y then X then Z.
};

enum	Axis
{
	AxisX,	// Do not modify X, Y and Z order.
	AxisY,
	AxisZ,
	AxisNone
};

void		Init();

/// Return the reverse rotation order from a given input order.
rOrder		ReverserRotationOrder(rOrder r);

float		Sqrt(float v);
		
float		TestEqual(float a, float b, float e = 0.000001f);
bool		EqualZero(float v, float e = 0.000001f);
		
float		Pow(float v, float exp);
		
float		Ceil(float);
float		Floor(float);
float		Mod(float);
		
float		RangeAdjust(float v, float old_min, float old_max, float new_min, float new_max);

float		Quantize(float v, float q);

float		Sin(float);
float		ASin(float);
float		Cos(float);
float		ACos(float);
float		Tan(float);
float		ATan(float);
		
bool		IsFinite(float);

	} // Math
} // GS


#endif	// __NMATH__