// The following ifdef block is the standard way of creating macros which make exporting 
// from a DLL simpler. All files within this DLL are compiled with the CCMATH_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see 
// CCMATH_API functions as being imported from a DLL, whereas this DLL sees symbols
// defined with this macro as being exported.
#ifndef ___CCMATH_H___
#define ___CCMATH_H___

//#define CCMATH_DLL_MODE

#ifdef CCMATH_DLL_MODE
#ifdef CCMATH_EXPORTS
#define CCMATH_API __declspec(dllexport)
#else
#define CCMATH_API __declspec(dllimport)
#endif
#else
#define CCMATH_API
#endif

class CCMATH_API Vector
{
public:
	union {
		struct {float x,y,z;};
		float Scalar[3];
	};

	Vector();
	Vector(const float _x, const float _y, const float _z);

	Vector operator+(const Vector &vec2) const;
	Vector operator-(const Vector &vec2) const;
	Vector operator&(const Vector &vec2) const;
	Vector operator*(const float Value) const;
	Vector operator^(const Vector &B) const;

	float	operator*(const Vector &vec2) const;
	void	operator+=(const Vector &vec2);
	void	operator+=(const float Value);
	void	operator-=(const Vector &vec2);
	void	operator*=(const float Value);
	void	operator&=(const Vector &vec2);
	int		operator!=(const Vector &vec2);

	int		CheckNAN();
	void	Clean();
	
	int		isRightXY(const Vector &A,const Vector &B) const;	
	float	DistanceToLineXY(const Vector &A,const Vector &B) const;
	Vector	VectorToLine(const Vector &DirNormalized) const;

	float	SqrNorm() const;
	float	Norm() const;
	
	float	NormXY() const;
	float	SqrNormXY() const;
	
	void	Normalize();

	void	Max(const Vector &vecB);
	void	Min(const Vector &vecB);

	int		IsIn2D(const Vector &Min,const Vector &Max);

	void Rotate90XY()  
	{ 
		float Swap;
		Swap = y;
		y = x;
		x = -Swap;
	};

	int IsRightLeftXY(const Vector &A,const Vector &B, int IsLeft = 0) const 
	{ 
		Vector D,E;
		float R;
		D = *this;
		D -= A;
		E = B;
		E -= A;
		R = (D.y * E.x) - (D.x * E.y);
		if (IsLeft)
			return R > 0 ? 0 : 1;
		else
			return R > 0 ? 1 : 0;
	};

};

class CCMATH_API MATRIX
{
public:
	Vector I,J,K,T;

	MATRIX();

	void	Identity();
	int		CheckNAN();
	void	Clean();
	void	Transp();

	void	Inverse(MATRIX &Dst);
	void	Blend(MATRIX &End, float Factor);
	
	void	GetScale(Vector &V);
	void	SetScale(Vector &V);

	void RotateAround_I(float Alpha);
	void RotateAround_J(float Alpha);
	void RotateAround_K(float Alpha);
	
	void RotateAround_X(float Alpha);
	void RotateAround_Y(float Alpha);
	void RotateAround_Z(float Alpha);

	void RotateAround(int Axis, float Alpha);

	inline	Vector	operator*(const Vector &V) const;
			void	operator*=(MATRIX &M);
			void	operator*=(float Scale);

	void ToEuler(Vector &eulerVect);
	void FromEuler(Vector eulerVect);
};

class CCMATH_API Quat
{
public:
	float x,y,z,w;
	Quat(void);
	Quat(float _x,float _y,float _z,float _w);
	Quat(Vector V,float _w);;
	Quat(Vector V);

	void ComputeFromMatrix(MATRIX *ActualMat);
	void TransforToMatrix(MATRIX *ActualMat);
	void TransforToVector(Vector &V);
	

	void ExtractFrom2Edges(Vector *Src,Vector *Dst);

	void operator*=(const float F);
	void operator+=(const Quat &Q2);
	Quat operator+(const Quat &Q2);

	void Normalize();
	void NormalizeW();

	Quat operator*(const Quat &Q2) const;
	Quat operator*(const float F) const;
	void operator*=(const Quat &Q2);
};

// BIT functions

void ComputeBitNum();
unsigned int GetBitNumberMIT(unsigned int n);
unsigned int GetBitNumberT(unsigned int Value);
unsigned int GetBitNumber(unsigned int n);
unsigned int GetBitReverse(unsigned int Value);
unsigned int GetBitExpand(unsigned int Value);			// Transform 0xFFFF into 0x55555555
unsigned int GetBitContract(unsigned int Value);		// Transform 0x55555555 into 0xFFFF
int	GetLogUpperPO2(float Value);
int GetUpperPO2(float Value);
int GetFirstBit(unsigned int Mask);

_inline float FastInvSqrt(float x)
{
	float xhalf = 0.5f*x;
	int i = *(int*)&x; // get bits for floating value
	i = 0x5f375a86- (i>>1); // gives initial guess y0
	x = *(float*)&i; // convert bits back to float
	x = x*(1.5f-xhalf*x*x); // Newton step, repeating increases accuracy
	return x;
}

_inline float FastSqrt(float number) {
	long i;
	float x, y;
	x = number * 0.5F;
	y  = number;
	i  = * ( long * ) &y;
	i  = 0x5f3759df - ( i >> 1 );
	y  = * ( float * ) &i;
	y  = y * ( 1.5F - ( x * y * y ) );
	y  = y * ( 1.5F - ( x * y * y ) );// 2nd iteration : Can be removed 
	return number * y;
}


#endif