Imported more code from the old engine.

[peakengine.git] / engine / include / support / matrix4.h

// Copyright (C) 2002-2007 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __IRR_MATRIX_H_INCLUDED__
#define __IRR_MATRIX_H_INCLUDED__

#include "irrTypes.h"
#include "vector3d.h"
#include "vector2d.h"
#include "plane3d.h"
#include "aabbox3d.h"
#include "rect.h"
#include <string.h>

namespace irr
{
namespace core
{

        //! 4x4 matrix. Mostly used as transformation matrix for 3d calculations.
        /* Matrix4 is mainly used by the Irrlicht engine for doing transformations.
        The matrix is a D3D style matrix, row major with translations in the 4th row.
        */
        template <class T>
        class CMatrix4
        {
                public:

                        //! Constructor Flags
                        enum eConstructor
                        {
                                EM4CONST_NOTHING = 0,
                                EM4CONST_COPY,
                                EM4CONST_IDENTITY,
                                EM4CONST_TRANSPOSED,
                                EM4CONST_INVERSE,
                                EM4CONST_INVERSE_TRANSPOSED
                        };

                        CMatrix4( eConstructor constructor = EM4CONST_IDENTITY );
                        CMatrix4( const CMatrix4<T>& other,eConstructor constructor = EM4CONST_COPY);

                        //! Simple operator for directly accessing every element of the matrix.
                        T& operator()(const s32 row, const s32 col) { definitelyIdentityMatrix=false; return M[ row * 4 + col ]; }

                        //! Simple operator for directly accessing every element of the matrix.
                        const T& operator()(const s32 row, const s32 col) const { return M[row * 4 + col]; }

                        //! Simple operator for linearly accessing every element of the matrix.
                        T& operator[](u32 index) { definitelyIdentityMatrix=false; return M[index]; }

                        //! Simple operator for linearly accessing every element of the matrix.
                        const T& operator[](u32 index) const { return M[index]; }

                        //! Sets this matrix equal to the other matrix.
                        inline CMatrix4<T>& operator=(const CMatrix4<T> &other);

                        //! Sets all elements of this matrix to the value.
                        inline CMatrix4<T>& operator=(const T& scalar);

                        //! Returns pointer to internal array
                        const T* pointer() const { return M; }
                        T* pointer() { definitelyIdentityMatrix=false; return M; }

                        //! Returns true if other matrix is equal to this matrix.
                        bool operator==(const CMatrix4<T> &other) const;

                        //! Returns true if other matrix is not equal to this matrix.
                        bool operator!=(const CMatrix4<T> &other) const;

                        //! Add another matrix.
                        CMatrix4<T> operator+(const CMatrix4<T>& other) const;

                        //! Add another matrix.
                        CMatrix4<T>& operator+=(const CMatrix4<T>& other);

                        //! Subtract another matrix.
                        CMatrix4<T> operator-(const CMatrix4<T>& other) const;

                        //! Subtract another matrix.
                        CMatrix4<T>& operator-=(const CMatrix4<T>& other);

                        //! set this matrix to the product of two matrices
                        inline void setbyproduct(const CMatrix4<T>& other_a,const CMatrix4<T>& other_b );

                        //! set this matrix to the product of two matrices, no logical optimation
                        //! use it if you know you never have a identity matrix
                        void setbyproduct_nocheck(const CMatrix4<T>& other_a,const CMatrix4<T>& other_b );

                        //! Multiply by another matrix.
                        CMatrix4<T> operator*(const CMatrix4<T>& other) const;

                        //! Multiply by another matrix.
                        CMatrix4<T>& operator*=(const CMatrix4<T>& other);

                        //! Multiply by scalar.
                        CMatrix4<T> operator*(const T& scalar) const;

                        //! Multiply by scalar.
                        CMatrix4<T>& operator*=(const T& scalar);

                        //! Set matrix to identity.
                        inline void makeIdentity();

                        //! Returns true if the matrix is the identity matrix
                        inline bool isIdentity() const;

                        //! Returns true if the matrix is the identity matrix
                        bool isIdentity_integer_base () const;

                        //! Set the translation of the current matrix. Will erase any previous values.
                        void setTranslation( const vector3d<T>& translation );

                        //! Gets the current translation
                        vector3d<T> getTranslation() const;

                        //! Set the inverse translation of the current matrix. Will erase any previous values.
                        void setInverseTranslation( const vector3d<T>& translation );

                        //! Make a rotation matrix from Euler angles. The 4th row and column are unmodified.
                        inline void setRotationRadians( const vector3d<T>& rotation );

                        //! Make a rotation matrix from Euler angles. The 4th row and column are unmodified.
                        void setRotationDegrees( const vector3d<T>& rotation );

                        //! Returns the rotation, as set by setRotation(). This code was orginally written by by Chev.
                        core::vector3d<T> getRotationDegrees() const;

                        //! Make an inverted rotation matrix from Euler angles. The 4th row and column are unmodified.
                        inline void setInverseRotationRadians( const vector3d<T>& rotation );

                        //! Make an inverted rotation matrix from Euler angles. The 4th row and column are unmodified.
                        void setInverseRotationDegrees( const vector3d<T>& rotation );

                        //! Set Scale
                        void setScale( const vector3d<T>& scale );

                        //! Get Scale
                        core::vector3d<T> getScale() const;

                        //! Translate a vector by the inverse of the translation part of this matrix.
                        void inverseTranslateVect( vector3df& vect ) const;

                        //! Rotate a vector by the inverse of the rotation part of this matrix.
                        void inverseRotateVect( vector3df& vect ) const;

                        //! Rotate a vector by the rotation part of this matrix.
                        void rotateVect( vector3df& vect ) const;

                        //! An alternate transform vector method, writing into a second vector
                        void rotateVect(vector3df& out,const core::vector3df& in) const;

                        //! An alternate transform vector method, writing into an array of 3 floats
                        void rotateVect(T *out,const core::vector3df &in) const;

                        //! Transforms the vector by this matrix
                        void transformVect( vector3df& vect) const;

                        //! Transforms input vector by this matrix and stores result in output vector
                        void transformVect( vector3df& out, const vector3df& in ) const;

                        //! An alternate transform vector method, writing into an array of 4 floats
                        void transformVect(T *out,const core::vector3df &in) const;

                        //! Translate a vector by the translation part of this matrix.
                        void translateVect( vector3df& vect ) const;

                        //! Transforms a plane by this matrix
                        void transformPlane( core::plane3d<f32> &plane) const;

                        //! Transforms a plane by this matrix ( some problems to solve..)
                        void transformPlane_new( core::plane3d<f32> &plane) const;

                        //! Transforms a plane by this matrix
                        void transformPlane( const core::plane3d<f32> &in, core::plane3d<f32> &out) const;

                        //! Transforms a axis aligned bounding box
                        /** The result box of this operation may not be very accurate. For
                        accurate results, use transformBoxEx() */
                        void transformBox(core::aabbox3d<f32>& box) const;

                        //! Transforms a axis aligned bounding box more accurately than transformBox()
                        /** The result box of this operation should by quite accurate, but this operation
                        is slower than transformBox(). */
                        void transformBoxEx(core::aabbox3d<f32>& box) const;

                        //! Multiplies this matrix by a 1x4 matrix
                        void multiplyWith1x4Matrix(T* matrix) const;

                        //! Calculates inverse of matrix. Slow.
                        //! \return Returns false if there is no inverse matrix.
                        bool makeInverse();


                        //! Inverts a primitive matrix which only contains a translation and a rotation
                        //! \param out: where result matrix is written to.
                        bool getInversePrimitive ( CMatrix4<T>& out ) const;

                        //! returns the inversed matrix of this one
                        //! \param out: where result matrix is written to.
                        //! \return Returns false if there is no inverse matrix.
                        bool getInverse(CMatrix4<T>& out) const;

                        //! Builds a right-handed perspective projection matrix based on a field of view
                        void buildProjectionMatrixPerspectiveFovRH(f32 fieldOfViewRadians, f32 aspectRatio, f32 zNear, f32 zFar);

                        //! Builds a left-handed perspective projection matrix based on a field of view
                        void buildProjectionMatrixPerspectiveFovLH(f32 fieldOfViewRadians, f32 aspectRatio, f32 zNear, f32 zFar);

                        //! Builds a right-handed perspective projection matrix.
                        void buildProjectionMatrixPerspectiveRH(f32 widthOfViewVolume, f32 heightOfViewVolume, f32 zNear, f32 zFar);

                        //! Builds a left-handed perspective projection matrix.
                        void buildProjectionMatrixPerspectiveLH(f32 widthOfViewVolume, f32 heightOfViewVolume, f32 zNear, f32 zFar);

                        //! Builds a left-handed orthogonal projection matrix.
                        void buildProjectionMatrixOrthoLH(f32 widthOfViewVolume, f32 heightOfViewVolume, f32 zNear, f32 zFar);

                        //! Builds a right-handed orthogonal projection matrix.
                        void buildProjectionMatrixOrthoRH(f32 widthOfViewVolume, f32 heightOfViewVolume, f32 zNear, f32 zFar);

                        //! Builds a left-handed look-at matrix.
                        void buildCameraLookAtMatrixLH(const vector3df& position, const vector3df& target, const vector3df& upVector);

                        //! Builds a right-handed look-at matrix.
                        void buildCameraLookAtMatrixRH(const vector3df& position, const vector3df& target, const vector3df& upVector);

                        //! Builds a matrix that flattens geometry into a plane.
                        //! \param light: light source
                        //! \param plane: plane into which the geometry if flattened into
                        //! \param point: value between 0 and 1, describing the light source.
                        //! If this is 1, it is a point light, if it is 0, it is a directional light.
                        void buildShadowMatrix(const core::vector3df& light, core::plane3df plane, f32 point=1.0f);

                        //! Builds a matrix which transforms a normalized Device Coordinate to Device Coordinates.
                        /** Used to scale <-1,-1><1,1> to viewport, for example from von <-1,-1> <1,1> to the viewport <0,0><0,640> */
                        void buildNDCToDCMatrix( const core::rect<s32>& area, f32 zScale);

                        //! creates a new matrix as interpolated matrix from two other ones.
                        //! \param b: other matrix to interpolate with
                        //! \param time: Must be a value between 0 and 1.
                        CMatrix4<T> interpolate(const core::CMatrix4<T>& b, f32 time) const;

                        //! returns transposed matrix
                        CMatrix4<T> getTransposed() const;

                        //! returns transposed matrix to a plain 4x4 float matrix
                        inline void getTransposed( CMatrix4<T>& dest ) const;

                        /*!
                                construct 2D Texture transformations
                                rotate about center, scale, and transform.
                        */
                        void setTextureScale( f32 sx, f32 sy );

                        void setTextureRotationCenter( f32 radAngle );
                        void setTextureScaleCenter( f32 sx, f32 sy );

                        void setTextureTranslate( f32 x, f32 y );

                        void buildTextureTransform( f32 rotateRad,
                                        const core::vector2df &rotatecenter,
                                        const core::vector2df &translate,
                                        const core::vector2df &scale);

                        //! sets all matrix data members at once
                        void setM(const T* data);

                        //! sets if the matrix is definitely identity matrix
                        void setDefinitelyIdentityMatrix( bool isDefinitelyIdentityMatrix);

                        //! gets if the matrix is definitely identity matrix
                        bool getDefinitelyIdentityMatrix() const;

                private:
                        //! Matrix data, stored in row-major order
                        T M[16];
                        mutable bool definitelyIdentityMatrix;
        };

        template <class T>
        inline CMatrix4<T>::CMatrix4( eConstructor constructor ) : definitelyIdentityMatrix(false)
        {
                switch ( constructor )
                {
                        case EM4CONST_NOTHING:
                        case EM4CONST_COPY:
                                break;
                        case EM4CONST_IDENTITY:
                        case EM4CONST_INVERSE:
                        default:
                                makeIdentity();
                                break;
                }
        }

        template <class T>
        inline CMatrix4<T>::CMatrix4( const CMatrix4<T>& other, eConstructor constructor) : definitelyIdentityMatrix(false)
        {
                switch ( constructor )
                {
                        case EM4CONST_IDENTITY:
                                makeIdentity();
                                break;
                        case EM4CONST_NOTHING:
                                break;
                        case EM4CONST_COPY:
                                *this = other;
                                break;
                        case EM4CONST_TRANSPOSED:
                                other.getTransposed(*this);
                                break;
                        case EM4CONST_INVERSE:
                                if (!other.getInverse(*this))
                                        memset(M, 0, 16*sizeof(T));
                                break;
                        case EM4CONST_INVERSE_TRANSPOSED:
                                if (!other.getInverse(*this))
                                        memset(M, 0, 16*sizeof(T));
                                else
                                        *this=getTransposed();
                                break;
                }
        }

        //! Add another matrix.
        template <class T>
        inline CMatrix4<T> CMatrix4<T>::operator+(const CMatrix4<T>& other) const
        {
                CMatrix4<T> temp ( EM4CONST_NOTHING );

                temp[0] = M[0]+other[0];
                temp[1] = M[1]+other[1];
                temp[2] = M[2]+other[2];
                temp[3] = M[3]+other[3];
                temp[4] = M[4]+other[4];
                temp[5] = M[5]+other[5];
                temp[6] = M[6]+other[6];
                temp[7] = M[7]+other[7];
                temp[8] = M[8]+other[8];
                temp[9] = M[9]+other[9];
                temp[10] = M[10]+other[10];
                temp[11] = M[11]+other[11];
                temp[12] = M[12]+other[12];
                temp[13] = M[13]+other[13];
                temp[14] = M[14]+other[14];
                temp[15] = M[15]+other[15];

                return temp;
        }

        //! Add another matrix.
        template <class T>
        inline CMatrix4<T>& CMatrix4<T>::operator+=(const CMatrix4<T>& other)
        {
                M[0]+=other[0];
                M[1]+=other[1];
                M[2]+=other[2];
                M[3]+=other[3];
                M[4]+=other[4];
                M[5]+=other[5];
                M[6]+=other[6];
                M[7]+=other[7];
                M[8]+=other[8];
                M[9]+=other[9];
                M[10]+=other[10];
                M[11]+=other[11];
                M[12]+=other[12];
                M[13]+=other[13];
                M[14]+=other[14];
                M[15]+=other[15];

                return *this;
        }

        //! Subtract another matrix.
        template <class T>
        inline CMatrix4<T> CMatrix4<T>::operator-(const CMatrix4<T>& other) const
        {
                CMatrix4<T> temp ( EM4CONST_NOTHING );

                temp[0] = M[0]-other[0];
                temp[1] = M[1]-other[1];
                temp[2] = M[2]-other[2];
                temp[3] = M[3]-other[3];
                temp[4] = M[4]-other[4];
                temp[5] = M[5]-other[5];
                temp[6] = M[6]-other[6];
                temp[7] = M[7]-other[7];
                temp[8] = M[8]-other[8];
                temp[9] = M[9]-other[9];
                temp[10] = M[10]-other[10];
                temp[11] = M[11]-other[11];
                temp[12] = M[12]-other[12];
                temp[13] = M[13]-other[13];
                temp[14] = M[14]-other[14];
                temp[15] = M[15]-other[15];

                return temp;
        }

        //! Subtract another matrix.
        template <class T>
        inline CMatrix4<T>& CMatrix4<T>::operator-=(const CMatrix4<T>& other)
        {
                M[0]-=other[0];
                M[1]-=other[1];
                M[2]-=other[2];
                M[3]-=other[3];
                M[4]-=other[4];
                M[5]-=other[5];
                M[6]-=other[6];
                M[7]-=other[7];
                M[8]-=other[8];
                M[9]-=other[9];
                M[10]-=other[10];
                M[11]-=other[11];
                M[12]-=other[12];
                M[13]-=other[13];
                M[14]-=other[14];
                M[15]-=other[15];

                return *this;
        }

        //! Multiply by scalar.
        template <class T>
        inline CMatrix4<T> CMatrix4<T>::operator*(const T& scalar) const
        {
                CMatrix4<T> temp ( EM4CONST_NOTHING );

                temp[0] = M[0]*scalar;
                temp[1] = M[1]*scalar;
                temp[2] = M[2]*scalar;
                temp[3] = M[3]*scalar;
                temp[4] = M[4]*scalar;
                temp[5] = M[5]*scalar;
                temp[6] = M[6]*scalar;
                temp[7] = M[7]*scalar;
                temp[8] = M[8]*scalar;
                temp[9] = M[9]*scalar;
                temp[10] = M[10]*scalar;
                temp[11] = M[11]*scalar;
                temp[12] = M[12]*scalar;
                temp[13] = M[13]*scalar;
                temp[14] = M[14]*scalar;
                temp[15] = M[15]*scalar;

                return temp;
        }

        //! Multiply by scalar.
        template <class T>
        inline CMatrix4<T>& CMatrix4<T>::operator*=(const T& scalar)
        {
                M[0]*=scalar;
                M[1]*=scalar;
                M[2]*=scalar;
                M[3]*=scalar;
                M[4]*=scalar;
                M[5]*=scalar;
                M[6]*=scalar;
                M[7]*=scalar;
                M[8]*=scalar;
                M[9]*=scalar;
                M[10]*=scalar;
                M[11]*=scalar;
                M[12]*=scalar;
                M[13]*=scalar;
                M[14]*=scalar;
                M[15]*=scalar;

                return *this;
        }

        //! Multiply by another matrix.
        template <class T>
        inline CMatrix4<T>& CMatrix4<T>::operator*=(const CMatrix4<T>& other)
        {
                // do chacks on your own in order to avoid copy creation
                if ( !other.isIdentity() )
                {
                        if ( this->isIdentity() )
                        {
                                *this = other;
                        }
                        else
                        {
                                CMatrix4<T> temp ( *this );
                                setbyproduct_nocheck( temp, other );
                        }
                }
                return *this;
        }

        //! multiply by another matrix
        // set this matrix to the product of two other matrices
        // goal is to reduce stack use and copy
        template <class T>
        inline void CMatrix4<T>::setbyproduct_nocheck(const CMatrix4<T>& other_a,const CMatrix4<T>& other_b )
        {
                const T *m1 = other_a.M;
                const T *m2 = other_b.M;

                M[0] = m1[0]*m2[0] + m1[4]*m2[1] + m1[8]*m2[2] + m1[12]*m2[3];
                M[1] = m1[1]*m2[0] + m1[5]*m2[1] + m1[9]*m2[2] + m1[13]*m2[3];
                M[2] = m1[2]*m2[0] + m1[6]*m2[1] + m1[10]*m2[2] + m1[14]*m2[3];
                M[3] = m1[3]*m2[0] + m1[7]*m2[1] + m1[11]*m2[2] + m1[15]*m2[3];

                M[4] = m1[0]*m2[4] + m1[4]*m2[5] + m1[8]*m2[6] + m1[12]*m2[7];
                M[5] = m1[1]*m2[4] + m1[5]*m2[5] + m1[9]*m2[6] + m1[13]*m2[7];
                M[6] = m1[2]*m2[4] + m1[6]*m2[5] + m1[10]*m2[6] + m1[14]*m2[7];
                M[7] = m1[3]*m2[4] + m1[7]*m2[5] + m1[11]*m2[6] + m1[15]*m2[7];

                M[8] = m1[0]*m2[8] + m1[4]*m2[9] + m1[8]*m2[10] + m1[12]*m2[11];
                M[9] = m1[1]*m2[8] + m1[5]*m2[9] + m1[9]*m2[10] + m1[13]*m2[11];
                M[10] = m1[2]*m2[8] + m1[6]*m2[9] + m1[10]*m2[10] + m1[14]*m2[11];
                M[11] = m1[3]*m2[8] + m1[7]*m2[9] + m1[11]*m2[10] + m1[15]*m2[11];

                M[12] = m1[0]*m2[12] + m1[4]*m2[13] + m1[8]*m2[14] + m1[12]*m2[15];
                M[13] = m1[1]*m2[12] + m1[5]*m2[13] + m1[9]*m2[14] + m1[13]*m2[15];
                M[14] = m1[2]*m2[12] + m1[6]*m2[13] + m1[10]*m2[14] + m1[14]*m2[15];
                M[15] = m1[3]*m2[12] + m1[7]*m2[13] + m1[11]*m2[14] + m1[15]*m2[15];
                definitelyIdentityMatrix=false;
        }


        //! multiply by another matrix
        // set this matrix to the product of two other matrices
        // goal is to reduce stack use and copy
        template <class T>
        inline void CMatrix4<T>::setbyproduct(const CMatrix4<T>& other_a,const CMatrix4<T>& other_b )
        {
                if ( other_a.isIdentity () )
                {
                        *this = other_b;
                        return;
                }
                else
                if ( other_b.isIdentity () )
                {
                        *this = other_a;
                        return;
                }
                setbyproduct_nocheck(other_a,other_b);
        }

        //! multiply by another matrix
        template <class T>
        inline CMatrix4<T> CMatrix4<T>::operator*(const CMatrix4<T>& m2) const
        {
                // Testing purpose..
                if ( this->isIdentity() )
                        return m2;
                if ( m2.isIdentity() )
                        return *this;

                CMatrix4<T> m3 ( EM4CONST_NOTHING );

                const T *m1 = M;

                m3[0] = m1[0]*m2[0] + m1[4]*m2[1] + m1[8]*m2[2] + m1[12]*m2[3];
                m3[1] = m1[1]*m2[0] + m1[5]*m2[1] + m1[9]*m2[2] + m1[13]*m2[3];
                m3[2] = m1[2]*m2[0] + m1[6]*m2[1] + m1[10]*m2[2] + m1[14]*m2[3];
                m3[3] = m1[3]*m2[0] + m1[7]*m2[1] + m1[11]*m2[2] + m1[15]*m2[3];

                m3[4] = m1[0]*m2[4] + m1[4]*m2[5] + m1[8]*m2[6] + m1[12]*m2[7];
                m3[5] = m1[1]*m2[4] + m1[5]*m2[5] + m1[9]*m2[6] + m1[13]*m2[7];
                m3[6] = m1[2]*m2[4] + m1[6]*m2[5] + m1[10]*m2[6] + m1[14]*m2[7];
                m3[7] = m1[3]*m2[4] + m1[7]*m2[5] + m1[11]*m2[6] + m1[15]*m2[7];

                m3[8] = m1[0]*m2[8] + m1[4]*m2[9] + m1[8]*m2[10] + m1[12]*m2[11];
                m3[9] = m1[1]*m2[8] + m1[5]*m2[9] + m1[9]*m2[10] + m1[13]*m2[11];
                m3[10] = m1[2]*m2[8] + m1[6]*m2[9] + m1[10]*m2[10] + m1[14]*m2[11];
                m3[11] = m1[3]*m2[8] + m1[7]*m2[9] + m1[11]*m2[10] + m1[15]*m2[11];

                m3[12] = m1[0]*m2[12] + m1[4]*m2[13] + m1[8]*m2[14] + m1[12]*m2[15];
                m3[13] = m1[1]*m2[12] + m1[5]*m2[13] + m1[9]*m2[14] + m1[13]*m2[15];
                m3[14] = m1[2]*m2[12] + m1[6]*m2[13] + m1[10]*m2[14] + m1[14]*m2[15];
                m3[15] = m1[3]*m2[12] + m1[7]*m2[13] + m1[11]*m2[14] + m1[15]*m2[15];
                return m3;
        }



        template <class T>
        inline vector3d<T> CMatrix4<T>::getTranslation() const
        {
                return vector3d<T>(M[12], M[13], M[14]);
        }


        template <class T>
        inline void CMatrix4<T>::setTranslation( const vector3d<T>& translation )
        {
                M[12] = translation.X;
                M[13] = translation.Y;
                M[14] = translation.Z;
                definitelyIdentityMatrix=false;
        }

        template <class T>
        inline void CMatrix4<T>::setInverseTranslation( const vector3d<T>& translation )
        {
                M[12] = -translation.X;
                M[13] = -translation.Y;
                M[14] = -translation.Z;
                definitelyIdentityMatrix=false;
        }

        template <class T>
        inline void CMatrix4<T>::setScale( const vector3d<T>& scale )
        {
                M[0] = scale.X;
                M[5] = scale.Y;
                M[10] = scale.Z;
                definitelyIdentityMatrix=false;
        }

        template <class T>
        inline vector3d<T> CMatrix4<T>::getScale() const
        {
                return vector3d<T>(M[0],M[5],M[10]);
        }

        template <class T>
        inline void CMatrix4<T>::setRotationDegrees( const vector3d<T>& rotation )
        {
                setRotationRadians( rotation * core::DEGTORAD );
        }

        template <class T>
        inline void CMatrix4<T>::setInverseRotationDegrees( const vector3d<T>& rotation )
        {
                setInverseRotationRadians( rotation * core::DEGTORAD );
        }

        template <class T>
        inline void CMatrix4<T>::setRotationRadians( const vector3d<T>& rotation )
        {
                f64 cr = cos( rotation.X );
                f64 sr = sin( rotation.X );
                f64 cp = cos( rotation.Y );
                f64 sp = sin( rotation.Y );
                f64 cy = cos( rotation.Z );
                f64 sy = sin( rotation.Z );

                M[0] = (T)( cp*cy );
                M[1] = (T)( cp*sy );
                M[2] = (T)( -sp );

                f64 srsp = sr*sp;
                f64 crsp = cr*sp;

                M[4] = (T)( srsp*cy-cr*sy );
                M[5] = (T)( srsp*sy+cr*cy );
                M[6] = (T)( sr*cp );

                M[8] = (T)( crsp*cy+sr*sy );
                M[9] = (T)( crsp*sy-sr*cy );
                M[10] = (T)( cr*cp );
                definitelyIdentityMatrix=false;
        }



        //! Returns the rotation, as set by setRotation(). This code was sent
        //! in by Chev.
        template <class T>
        inline core::vector3d<T> CMatrix4<T>::getRotationDegrees() const
        {
                const CMatrix4<T> &mat = *this;

                f64 Y = -asin(mat(0,2));
                f64 C = cos(Y);
                Y *= RADTODEG64;

                f64 rotx, roty, X, Z;

                if (fabs(C)>0.0005f)
                {
                        rotx = mat(2,2) / C;
                        roty = mat(1,2) / C;
                        X = atan2( roty, rotx ) * RADTODEG64;
                        rotx = mat(0,0) / C;
                        roty = mat(0,1) / C;
                        Z = atan2( roty, rotx ) * RADTODEG64;
                }
                else
                {
                        X = 0.0;
                        rotx = mat(1,1);
                        roty = -mat(1,0);
                        Z = atan2( roty, rotx ) * RADTODEG64;
                }

                // fix values that get below zero
                // before it would set (!) values to 360
                // that where above 360:
                if (X < 0.0) X += 360.0;
                if (Y < 0.0) Y += 360.0;
                if (Z < 0.0) Z += 360.0;

                return vector3d<T>((f32)X,(f32)Y,(f32)Z);
        }

        template <class T>
        inline void CMatrix4<T>::setInverseRotationRadians( const vector3d<T>& rotation )
        {
                f64 cr = cos( rotation.X );
                f64 sr = sin( rotation.X );
                f64 cp = cos( rotation.Y );
                f64 sp = sin( rotation.Y );
                f64 cy = cos( rotation.Z );
                f64 sy = sin( rotation.Z );

                M[0] = (T)( cp*cy );
                M[4] = (T)( cp*sy );
                M[8] = (T)( -sp );

                f64 srsp = sr*sp;
                f64 crsp = cr*sp;

                M[1] = (T)( srsp*cy-cr*sy );
                M[5] = (T)( srsp*sy+cr*cy );
                M[9] = (T)( sr*cp );

                M[2] = (T)( crsp*cy+sr*sy );
                M[6] = (T)( crsp*sy-sr*cy );
                M[10] = (T)( cr*cp );
                definitelyIdentityMatrix=false;
        }


        /*!
        */
        template <class T>
        inline void CMatrix4<T>::makeIdentity()
        {
                memset(M, 0, 16*sizeof(T));
                M[0] = M[5] = M[10] = M[15] = (T)1;
                definitelyIdentityMatrix=true;
        }


        /*
                check identity with epsilon
                solve floating range problems..
        */
        template <class T>
        inline bool CMatrix4<T>::isIdentity() const
        {
                if (definitelyIdentityMatrix)
                        return true;
                if (    !equals ( M[ 0], (T)1 ) ||
                                !equals ( M[ 5], (T)1 ) ||
                                !equals ( M[10], (T)1 ) ||
                                !equals ( M[15], (T)1 )
                        )
                        return false;

                for (s32 i=0; i<4; ++i)
                        for (s32 j=0; j<4; ++j)
                                if (j != i)
                                        if (!iszero((*this)(i,j)))
                                                return false;

                definitelyIdentityMatrix=true;
                return true;
        }

        /*
                doesn't solve floating range problems..
                but takes care on +/- 0 on translation because we are changing it..
                reducing floating point branches
                but it needs the floats in memory..
        */
        template <class T>
        inline bool CMatrix4<T>::isIdentity_integer_base() const
        {
                if (definitelyIdentityMatrix)
                        return true;
                if(IR(M[0])!=F32_VALUE_1)       return false;
                if(IR(M[1])!=0)                 return false;
                if(IR(M[2])!=0)                 return false;
                if(IR(M[3])!=0)                 return false;

                if(IR(M[4])!=0)                 return false;
                if(IR(M[5])!=F32_VALUE_1)       return false;
                if(IR(M[6])!=0)                 return false;
                if(IR(M[7])!=0)                 return false;

                if(IR(M[8])!=0)                 return false;
                if(IR(M[9])!=0)                 return false;
                if(IR(M[10])!=F32_VALUE_1)      return false;
                if(IR(M[11])!=0)                return false;

                if(IR(M[12])!=0)                return false;
                if(IR(M[13])!=0)                return false;
                if(IR(M[13])!=0)                return false;
                if(IR(M[15])!=F32_VALUE_1)      return false;
                definitelyIdentityMatrix=true;
                return true;
        }



        template <class T>
        inline void CMatrix4<T>::rotateVect( vector3df& vect ) const
        {
                vector3df tmp = vect;
                vect.X = tmp.X*M[0] + tmp.Y*M[4] + tmp.Z*M[8];
                vect.Y = tmp.X*M[1] + tmp.Y*M[5] + tmp.Z*M[9];
                vect.Z = tmp.X*M[2] + tmp.Y*M[6] + tmp.Z*M[10];
        }

        //! An alternate transform vector method, writing into a second vector
        template <class T>
        inline void CMatrix4<T>::rotateVect(core::vector3df& out, const core::vector3df& in) const
        {
                out.X = in.X*M[0] + in.Y*M[4] + in.Z*M[8];
                out.Y = in.X*M[1] + in.Y*M[5] + in.Z*M[9];
                out.Z = in.X*M[2] + in.Y*M[6] + in.Z*M[10];
        }

        //! An alternate transform vector method, writing into an array of 3 floats
        template <class T>
        inline void CMatrix4<T>::rotateVect(T *out, const core::vector3df& in) const
        {
                out[0] = in.X*M[0] + in.Y*M[4] + in.Z*M[8];
                out[1] = in.X*M[1] + in.Y*M[5] + in.Z*M[9];
                out[2] = in.X*M[2] + in.Y*M[6] + in.Z*M[10];
        }

        template <class T>
        inline void CMatrix4<T>::inverseRotateVect( vector3df& vect ) const
        {
                vector3df tmp = vect;
                vect.X = tmp.X*M[0] + tmp.Y*M[1] + tmp.Z*M[2];
                vect.Y = tmp.X*M[4] + tmp.Y*M[5] + tmp.Z*M[6];
                vect.Z = tmp.X*M[8] + tmp.Y*M[9] + tmp.Z*M[10];
        }

        template <class T>
        inline void CMatrix4<T>::transformVect( vector3df& vect) const
        {
                f32 vector[3];

                vector[0] = vect.X*M[0] + vect.Y*M[4] + vect.Z*M[8] + M[12];
                vector[1] = vect.X*M[1] + vect.Y*M[5] + vect.Z*M[9] + M[13];
                vector[2] = vect.X*M[2] + vect.Y*M[6] + vect.Z*M[10] + M[14];

                vect.X = vector[0];
                vect.Y = vector[1];
                vect.Z = vector[2];
        }

        template <class T>
        inline void CMatrix4<T>::transformVect( vector3df& out, const vector3df& in) const
        {
                out.X = in.X*M[0] + in.Y*M[4] + in.Z*M[8] + M[12];
                out.Y = in.X*M[1] + in.Y*M[5] + in.Z*M[9] + M[13];
                out.Z = in.X*M[2] + in.Y*M[6] + in.Z*M[10] + M[14];
        }


        template <class T>
        inline void CMatrix4<T>::transformVect(T *out,const vector3df &in) const
        {
                out[0] = in.X*M[0] + in.Y*M[4] + in.Z*M[8] + M[12];
                out[1] = in.X*M[1] + in.Y*M[5] + in.Z*M[9] + M[13];
                out[2] = in.X*M[2] + in.Y*M[6] + in.Z*M[10] + M[14];
                out[3] = in.X*M[3] + in.Y*M[7] + in.Z*M[11] + M[15];
        }


        //! Transforms a plane by this matrix
        template <class T>
        inline void CMatrix4<T>::transformPlane( core::plane3d<f32> &plane) const
        {
                vector3df member;
                transformVect(member, plane.getMemberPoint());

                vector3df origin(0,0,0);
                transformVect(plane.Normal);
                transformVect(origin);

                plane.Normal -= origin;
                plane.D = - member.dotProduct(plane.Normal);
        }

        //! Transforms a plane by this matrix
        template <class T>
        inline void CMatrix4<T>::transformPlane_new( core::plane3d<f32> &plane) const
        {
                // rotate normal -> rotateVect ( plane.n );
                vector3df n;
                n.X = plane.Normal.X*M[0] + plane.Normal.Y*M[4] + plane.Normal.Z*M[8];
                n.Y = plane.Normal.X*M[1] + plane.Normal.Y*M[5] + plane.Normal.Z*M[9];
                n.Z = plane.Normal.X*M[2] + plane.Normal.Y*M[6] + plane.Normal.Z*M[10];

                // compute new d. -> getTranslation(). dotproduct ( plane.n )
                plane.D -= M[12] * n.X + M[13] * n.Y + M[14] * n.Z;
                plane.Normal.X = n.X;
                plane.Normal.Y = n.Y;
                plane.Normal.Z = n.Z;
        }

        //! Transforms a plane by this matrix
        template <class T>
        inline void CMatrix4<T>::transformPlane( const core::plane3d<f32> &in, core::plane3d<f32> &out) const
        {
                out = in;
                transformPlane( out );
        }

        //! Transforms a axis aligned bounding box
        template <class T>
        inline void CMatrix4<T>::transformBox(core::aabbox3d<f32>& box) const
        {
                if (isIdentity() )
                        return;

                transformVect(box.MinEdge);
                transformVect(box.MaxEdge);
                box.repair();
        }

        //! Transforms a axis aligned bounding box more accurately than transformBox()
        template <class T>
        inline void CMatrix4<T>::transformBoxEx(core::aabbox3d<f32>& box) const
        {
                f32 Amin[3];
                f32 Amax[3];
                f32 Bmin[3];
                f32 Bmax[3];

                Amin[0] = box.MinEdge.X;
                Amin[1] = box.MinEdge.Y;
                Amin[2] = box.MinEdge.Z;

                Amax[0] = box.MaxEdge.X;
                Amax[1] = box.MaxEdge.Y;
                Amax[2] = box.MaxEdge.Z;

                Bmin[0] = Bmax[0] = M[12];
                Bmin[1] = Bmax[1] = M[13];
                Bmin[2] = Bmax[2] = M[14];

                u32 i, j;
                const CMatrix4<T> &m = *this;

                for (i = 0; i < 3; ++i)
                {
                        for (j = 0; j < 3; ++j)
                        {
                                f32 a = m(j,i) * Amin[j];
                                f32 b = m(j,i) * Amax[j];

                                if (a < b)
                                {
                                        Bmin[i] += a;
                                        Bmax[i] += b;
                                }
                                else
                                {
                                        Bmin[i] += b;
                                        Bmax[i] += a;
                                }
                        }
                }

                box.MinEdge.X = Bmin[0];
                box.MinEdge.Y = Bmin[1];
                box.MinEdge.Z = Bmin[2];

                box.MaxEdge.X = Bmax[0];
                box.MaxEdge.Y = Bmax[1];
                box.MaxEdge.Z = Bmax[2];
        }


        //! Multiplies this matrix by a 1x4 matrix
        template <class T>
        inline void CMatrix4<T>::multiplyWith1x4Matrix(T* matrix) const
        {
                /*
                0  1  2  3
                4  5  6  7
                8  9  10 11
                12 13 14 15
                */

                T mat[4];
                mat[0] = matrix[0];
                mat[1] = matrix[1];
                mat[2] = matrix[2];
                mat[3] = matrix[3];

                matrix[0] = M[0]*mat[0] + M[4]*mat[1] + M[8]*mat[2] + M[12]*mat[3];
                matrix[1] = M[1]*mat[0] + M[5]*mat[1] + M[9]*mat[2] + M[13]*mat[3];
                matrix[2] = M[2]*mat[0] + M[6]*mat[1] + M[10]*mat[2] + M[14]*mat[3];
                matrix[3] = M[3]*mat[0] + M[7]*mat[1] + M[11]*mat[2] + M[15]*mat[3];
        }

        template <class T>
        inline void CMatrix4<T>::inverseTranslateVect( vector3df& vect ) const
        {
                vect.X = vect.X-M[12];
                vect.Y = vect.Y-M[13];
                vect.Z = vect.Z-M[14];
        }

        template <class T>
        inline void CMatrix4<T>::translateVect( vector3df& vect ) const
        {
                vect.X = vect.X+M[12];
                vect.Y = vect.Y+M[13];
                vect.Z = vect.Z+M[14];
        }


        template <class T>
        inline bool CMatrix4<T>::getInverse(CMatrix4<T>& out) const
        {
                /// Calculates the inverse of this Matrix
                /// The inverse is calculated using Cramers rule.
                /// If no inverse exists then 'false' is returned.

                if ( this->isIdentity() )
                {
                        out=*this;
                        return true;
                }

                const CMatrix4<T> &m = *this;

                f32 d = (m(0, 0) * m(1, 1) - m(0, 1) * m(1, 0)) * (m(2, 2) * m(3, 3) - m(2, 3) * m(3, 2)) -
                        (m(0, 0) * m(1, 2) - m(0, 2) * m(1, 0)) * (m(2, 1) * m(3, 3) - m(2, 3) * m(3, 1)) +
                        (m(0, 0) * m(1, 3) - m(0, 3) * m(1, 0)) * (m(2, 1) * m(3, 2) - m(2, 2) * m(3, 1)) +
                        (m(0, 1) * m(1, 2) - m(0, 2) * m(1, 1)) * (m(2, 0) * m(3, 3) - m(2, 3) * m(3, 0)) -
                        (m(0, 1) * m(1, 3) - m(0, 3) * m(1, 1)) * (m(2, 0) * m(3, 2) - m(2, 2) * m(3, 0)) +
                        (m(0, 2) * m(1, 3) - m(0, 3) * m(1, 2)) * (m(2, 0) * m(3, 1) - m(2, 1) * m(3, 0));

                if( core::iszero ( d ) )
                        return false;

                d = core::reciprocal ( d );

                out(0, 0) = d * (m(1, 1) * (m(2, 2) * m(3, 3) - m(2, 3) * m(3, 2)) + m(1, 2) * (m(2, 3) * m(3, 1) - m(2, 1) * m(3, 3)) + m(1, 3) * (m(2, 1) * m(3, 2) - m(2, 2) * m(3, 1)));
                out(0, 1) = d * (m(2, 1) * (m(0, 2) * m(3, 3) - m(0, 3) * m(3, 2)) + m(2, 2) * (m(0, 3) * m(3, 1) - m(0, 1) * m(3, 3)) + m(2, 3) * (m(0, 1) * m(3, 2) - m(0, 2) * m(3, 1)));
                out(0, 2) = d * (m(3, 1) * (m(0, 2) * m(1, 3) - m(0, 3) * m(1, 2)) + m(3, 2) * (m(0, 3) * m(1, 1) - m(0, 1) * m(1, 3)) + m(3, 3) * (m(0, 1) * m(1, 2) - m(0, 2) * m(1, 1)));
                out(0, 3) = d * (m(0, 1) * (m(1, 3) * m(2, 2) - m(1, 2) * m(2, 3)) + m(0, 2) * (m(1, 1) * m(2, 3) - m(1, 3) * m(2, 1)) + m(0, 3) * (m(1, 2) * m(2, 1) - m(1, 1) * m(2, 2)));
                out(1, 0) = d * (m(1, 2) * (m(2, 0) * m(3, 3) - m(2, 3) * m(3, 0)) + m(1, 3) * (m(2, 2) * m(3, 0) - m(2, 0) * m(3, 2)) + m(1, 0) * (m(2, 3) * m(3, 2) - m(2, 2) * m(3, 3)));
                out(1, 1) = d * (m(2, 2) * (m(0, 0) * m(3, 3) - m(0, 3) * m(3, 0)) + m(2, 3) * (m(0, 2) * m(3, 0) - m(0, 0) * m(3, 2)) + m(2, 0) * (m(0, 3) * m(3, 2) - m(0, 2) * m(3, 3)));
                out(1, 2) = d * (m(3, 2) * (m(0, 0) * m(1, 3) - m(0, 3) * m(1, 0)) + m(3, 3) * (m(0, 2) * m(1, 0) - m(0, 0) * m(1, 2)) + m(3, 0) * (m(0, 3) * m(1, 2) - m(0, 2) * m(1, 3)));
                out(1, 3) = d * (m(0, 2) * (m(1, 3) * m(2, 0) - m(1, 0) * m(2, 3)) + m(0, 3) * (m(1, 0) * m(2, 2) - m(1, 2) * m(2, 0)) + m(0, 0) * (m(1, 2) * m(2, 3) - m(1, 3) * m(2, 2)));
                out(2, 0) = d * (m(1, 3) * (m(2, 0) * m(3, 1) - m(2, 1) * m(3, 0)) + m(1, 0) * (m(2, 1) * m(3, 3) - m(2, 3) * m(3, 1)) + m(1, 1) * (m(2, 3) * m(3, 0) - m(2, 0) * m(3, 3)));
                out(2, 1) = d * (m(2, 3) * (m(0, 0) * m(3, 1) - m(0, 1) * m(3, 0)) + m(2, 0) * (m(0, 1) * m(3, 3) - m(0, 3) * m(3, 1)) + m(2, 1) * (m(0, 3) * m(3, 0) - m(0, 0) * m(3, 3)));
                out(2, 2) = d * (m(3, 3) * (m(0, 0) * m(1, 1) - m(0, 1) * m(1, 0)) + m(3, 0) * (m(0, 1) * m(1, 3) - m(0, 3) * m(1, 1)) + m(3, 1) * (m(0, 3) * m(1, 0) - m(0, 0) * m(1, 3)));
                out(2, 3) = d * (m(0, 3) * (m(1, 1) * m(2, 0) - m(1, 0) * m(2, 1)) + m(0, 0) * (m(1, 3) * m(2, 1) - m(1, 1) * m(2, 3)) + m(0, 1) * (m(1, 0) * m(2, 3) - m(1, 3) * m(2, 0)));
                out(3, 0) = d * (m(1, 0) * (m(2, 2) * m(3, 1) - m(2, 1) * m(3, 2)) + m(1, 1) * (m(2, 0) * m(3, 2) - m(2, 2) * m(3, 0)) + m(1, 2) * (m(2, 1) * m(3, 0) - m(2, 0) * m(3, 1)));
                out(3, 1) = d * (m(2, 0) * (m(0, 2) * m(3, 1) - m(0, 1) * m(3, 2)) + m(2, 1) * (m(0, 0) * m(3, 2) - m(0, 2) * m(3, 0)) + m(2, 2) * (m(0, 1) * m(3, 0) - m(0, 0) * m(3, 1)));
                out(3, 2) = d * (m(3, 0) * (m(0, 2) * m(1, 1) - m(0, 1) * m(1, 2)) + m(3, 1) * (m(0, 0) * m(1, 2) - m(0, 2) * m(1, 0)) + m(3, 2) * (m(0, 1) * m(1, 0) - m(0, 0) * m(1, 1)));
                out(3, 3) = d * (m(0, 0) * (m(1, 1) * m(2, 2) - m(1, 2) * m(2, 1)) + m(0, 1) * (m(1, 2) * m(2, 0) - m(1, 0) * m(2, 2)) + m(0, 2) * (m(1, 0) * m(2, 1) - m(1, 1) * m(2, 0)));
                out.definitelyIdentityMatrix = definitelyIdentityMatrix;
                return true;
        }


        //! Inverts a primitive matrix which only contains a translation and a rotation
        //! \param out: where result matrix is written to.
        template <class T>
        inline bool CMatrix4<T>::getInversePrimitive ( CMatrix4<T>& out ) const
        {
                out.M[0 ]       = M[0];
                out.M[1 ]       = M[4];
                out.M[2 ]       = M[8];
                out.M[3 ]       = 0;

                out.M[4 ]       = M[1];
                out.M[5 ]       = M[5];
                out.M[6 ]       = M[9];
                out.M[7 ]       = 0;

                out.M[8 ]       = M[2];
                out.M[9 ]       = M[6];
                out.M[10]       = M[10];
                out.M[11]       = 0;

                out.M[12]       = (T)-(M[12]*M[0] + M[13]*M[1] + M[14]*M[2]);
                out.M[13]       = (T)-(M[12]*M[4] + M[13]*M[5] + M[14]*M[6]);
                out.M[14]       = (T)-(M[12]*M[8] + M[13]*M[9] + M[14]*M[10]);
                out.M[15]       = 1;
                out.definitelyIdentityMatrix = definitelyIdentityMatrix;
                return true;
        }

        /*!
        */
        template <class T>
        inline bool CMatrix4<T>::makeInverse()
        {
                if (definitelyIdentityMatrix)
                        return true;

                CMatrix4<T> temp ( EM4CONST_NOTHING );

                if (getInverse(temp))
                {
                        *this = temp;
                        return true;
                }

                return false;
        }



        template <class T>
        inline CMatrix4<T>& CMatrix4<T>::operator=(const CMatrix4<T> &other)
        {
                if (this==&other)
                        return *this;
                memcpy(M, other.M, 16*sizeof(T));
                definitelyIdentityMatrix=other.definitelyIdentityMatrix;
                return *this;
        }



        template <class T>
        inline CMatrix4<T>& CMatrix4<T>::operator=(const T& scalar)
        {
                for (s32 i = 0; i < 16; ++i)
                        M[i]=scalar;
                definitelyIdentityMatrix=false;
                return *this;
        }



        template <class T>
        inline bool CMatrix4<T>::operator==(const CMatrix4<T> &other) const
        {
                if (definitelyIdentityMatrix && other.definitelyIdentityMatrix)
                        return true;
                for (s32 i = 0; i < 16; ++i)
                        if (M[i] != other.M[i])
                                return false;

                return true;
        }



        template <class T>
        inline bool CMatrix4<T>::operator!=(const CMatrix4<T> &other) const
        {
                return !(*this == other);
        }



        //! Builds a right-handed perspective projection matrix based on a field of view
        template <class T>
        inline void CMatrix4<T>::buildProjectionMatrixPerspectiveFovRH(f32 fieldOfViewRadians, f32 aspectRatio, f32 zNear, f32 zFar)
        {
                f64 h = 1.0/tan(fieldOfViewRadians/2.0);
                T w = h / aspectRatio;

                M[0] = w;
                M[1] = 0;
                M[2] = 0;
                M[3] = 0;

                M[4] = 0;
                M[5] = (T)h;
                M[6] = 0;
                M[7] = 0;

                M[8] = 0;
                M[9] = 0;
                M[10] = (T)(zFar/(zNear-zFar)); // DirectX version
//              M[10] = (T)(zFar+zNear/(zNear-zFar)); // OpenGL version
                M[11] = -1;

                M[12] = 0;
                M[13] = 0;
                M[14] = (T)(zNear*zFar/(zNear-zFar)); // DirectX version
//              M[14] = (T)(2.0f*zNear*zFar/(zNear-zFar)); // OpenGL version
                M[15] = 0;
                definitelyIdentityMatrix=false;
        }



        //! Builds a left-handed perspective projection matrix based on a field of view
        template <class T>
        inline void CMatrix4<T>::buildProjectionMatrixPerspectiveFovLH(f32 fieldOfViewRadians, f32 aspectRatio, f32 zNear, f32 zFar)
        {
                f64 h = 1.0/tan(fieldOfViewRadians/2.0);
                T w = (T)(h / aspectRatio);

                M[0] = w;
                M[1] = 0;
                M[2] = 0;
                M[3] = 0;

                M[4] = 0;
                M[5] = (T)h;
                M[6] = 0;
                M[7] = 0;

                M[8] = 0;
                M[9] = 0;
                M[10] = (T)(zFar/(zFar-zNear));
                M[11] = 1;

                M[12] = 0;
                M[13] = 0;
                M[14] = (T)(-zNear*zFar/(zFar-zNear));
                M[15] = 0;
                definitelyIdentityMatrix=false;
        }



        //! Builds a left-handed orthogonal projection matrix.
        template <class T>
        inline void CMatrix4<T>::buildProjectionMatrixOrthoLH(f32 widthOfViewVolume, f32 heightOfViewVolume, f32 zNear, f32 zFar)
        {
                M[0] = (T)(2/widthOfViewVolume);
                M[1] = 0;
                M[2] = 0;
                M[3] = 0;

                M[4] = 0;
                M[5] = (T)(2/heightOfViewVolume);
                M[6] = 0;
                M[7] = 0;

                M[8] = 0;
                M[9] = 0;
                M[10] = (T)(1/(zFar-zNear));
                M[11] = 0;

                M[12] = 0;
                M[13] = 0;
                M[14] = (T)(zNear/(zNear-zFar));
                M[15] = 1;
                definitelyIdentityMatrix=false;
        }



        //! Builds a right-handed orthogonal projection matrix.
        template <class T>
        inline void CMatrix4<T>::buildProjectionMatrixOrthoRH(f32 widthOfViewVolume, f32 heightOfViewVolume, f32 zNear, f32 zFar)
        {
                M[0] = (T)(2/widthOfViewVolume);
                M[1] = 0;
                M[2] = 0;
                M[3] = 0;

                M[4] = 0;
                M[5] = (T)(2/heightOfViewVolume);
                M[6] = 0;
                M[7] = 0;

                M[8] = 0;
                M[9] = 0;
                M[10] = (T)(1/(zNear-zFar));
                M[11] = 0;

                M[12] = 0;
                M[13] = 0;
                M[14] = (T)(zNear/(zNear-zFar));
                M[15] = -1;
                definitelyIdentityMatrix=false;
        }


        //! Builds a right-handed perspective projection matrix.
        template <class T>
        inline void CMatrix4<T>::buildProjectionMatrixPerspectiveRH(f32 widthOfViewVolume, f32 heightOfViewVolume, f32 zNear, f32 zFar)
        {
                M[0] = (T)(2*zNear/widthOfViewVolume);
                M[1] = 0;
                M[2] = 0;
                M[3] = 0;

                M[4] = 0;
                M[5] = (T)(2*zNear/heightOfViewVolume);
                M[6] = 0;
                M[7] = 0;

                M[8] = 0;
                M[9] = 0;
                M[10] = (T)(zFar/(zNear-zFar));
                M[11] = -1;

                M[12] = 0;
                M[13] = 0;
                M[14] = (T)(zNear*zFar/(zNear-zFar));
                M[15] = 0;
                definitelyIdentityMatrix=false;
        }


        //! Builds a left-handed perspective projection matrix.
        template <class T>
        inline void CMatrix4<T>::buildProjectionMatrixPerspectiveLH(f32 widthOfViewVolume, f32 heightOfViewVolume, f32 zNear, f32 zFar)
        {
                M[0] = (T)(2*zNear/widthOfViewVolume);
                M[1] = 0;
                M[2] = 0;
                M[3] = 0;

                M[4] = 0;
                M[5] = (T)(2*zNear/heightOfViewVolume);
                M[6] = 0;
                M[7] = 0;

                M[8] = 0;
                M[9] = 0;
                M[10] = (T)(zFar/(zFar-zNear));
                M[11] = 1;

                M[12] = 0;
                M[13] = 0;
                M[14] = (T)(zNear*zFar/(zNear-zFar));
                M[15] = 0;
                definitelyIdentityMatrix=false;
        }


        //! Builds a matrix that flattens geometry into a plane.
        template <class T>
        inline void CMatrix4<T>::buildShadowMatrix(const core::vector3df& light, core::plane3df plane, f32 point)
        {
                plane.Normal.normalize();
                f32 d = plane.Normal.dotProduct(light);

                M[ 0] = (T)(-plane.Normal.X * light.X + d);
                M[ 1] = (T)(-plane.Normal.X * light.Y);
                M[ 2] = (T)(-plane.Normal.X * light.Z);
                M[ 3] = (T)(-plane.Normal.X * point);

                M[ 4] = (T)(-plane.Normal.Y * light.X);
                M[ 5] = (T)(-plane.Normal.Y * light.Y + d);
                M[ 6] = (T)(-plane.Normal.Y * light.Z);
                M[ 7] = (T)(-plane.Normal.Y * point);

                M[ 8] = (T)(-plane.Normal.Z * light.X);
                M[ 9] = (T)(-plane.Normal.Z * light.Y);
                M[10] = (T)(-plane.Normal.Z * light.Z + d);
                M[11] = (T)(-plane.Normal.Z * point);

                M[12] = (T)(-plane.D * light.X);
                M[13] = (T)(-plane.D * light.Y);
                M[14] = (T)(-plane.D * light.Z);
                M[15] = (T)(-plane.D * point + d);
                definitelyIdentityMatrix=false;
        }

        //! Builds a left-handed look-at matrix.
        template <class T>
        inline void CMatrix4<T>::buildCameraLookAtMatrixLH(
                                const vector3df& position,
                                const vector3df& target,
                                const vector3df& upVector)
        {
                vector3df zaxis = target - position;
                zaxis.normalize();

                vector3df xaxis = upVector.crossProduct(zaxis);
                xaxis.normalize();

                vector3df yaxis = zaxis.crossProduct(xaxis);

                M[0] = (T)xaxis.X;
                M[1] = (T)yaxis.X;
                M[2] = (T)zaxis.X;
                M[3] = 0;

                M[4] = (T)xaxis.Y;
                M[5] = (T)yaxis.Y;
                M[6] = (T)zaxis.Y;
                M[7] = 0;

                M[8] = (T)xaxis.Z;
                M[9] = (T)yaxis.Z;
                M[10] = (T)zaxis.Z;
                M[11] = 0;

                M[12] = (T)-xaxis.dotProduct(position);
                M[13] = (T)-yaxis.dotProduct(position);
                M[14] = (T)-zaxis.dotProduct(position);
                M[15] = 1;
                definitelyIdentityMatrix=false;
        }



        //! Builds a right-handed look-at matrix.
        template <class T>
        inline void CMatrix4<T>::buildCameraLookAtMatrixRH(
                                const vector3df& position,
                                const vector3df& target,
                                const vector3df& upVector)
        {
                vector3df zaxis = position - target;
                zaxis.normalize();

                vector3df xaxis = upVector.crossProduct(zaxis);
                xaxis.normalize();

                vector3df yaxis = zaxis.crossProduct(xaxis);

                M[0] = (T)xaxis.X;
                M[1] = (T)yaxis.X;
                M[2] = (T)zaxis.X;
                M[3] = 0;

                M[4] = (T)xaxis.Y;
                M[5] = (T)yaxis.Y;
                M[6] = (T)zaxis.Y;
                M[7] = 0;

                M[8] = (T)xaxis.Z;
                M[9] = (T)yaxis.Z;
                M[10] = (T)zaxis.Z;
                M[11] = 0;

                M[12] = (T)-xaxis.dotProduct(position);
                M[13] = (T)-yaxis.dotProduct(position);
                M[14] = (T)-zaxis.dotProduct(position);
                M[15] = 1;
                definitelyIdentityMatrix=false;
        }


        //! creates a new matrix as interpolated matrix from to other ones.
        //! \param time: Must be a value between 0 and 1.
        template <class T>
        inline CMatrix4<T> CMatrix4<T>::interpolate(const core::CMatrix4<T>& b, f32 time) const
        {
                CMatrix4<T> mat ( EM4CONST_NOTHING );

                for (u32 i=0; i < 16; i += 4)
                {
                        mat.M[i+0] = (T)(M[i+0] + ( b.M[i+0] - M[i+0] ) * time);
                        mat.M[i+1] = (T)(M[i+1] + ( b.M[i+1] - M[i+1] ) * time);
                        mat.M[i+2] = (T)(M[i+2] + ( b.M[i+2] - M[i+2] ) * time);
                        mat.M[i+3] = (T)(M[i+3] + ( b.M[i+3] - M[i+3] ) * time);
                }
                return mat;
        }

        //! returns transposed matrix
        template <class T>
        inline CMatrix4<T> CMatrix4<T>::getTransposed() const
        {
                CMatrix4<T> t ( EM4CONST_NOTHING );
                getTransposed ( t );
                return t;
        }

        //! returns transposed matrix
        template <class T>
        inline void CMatrix4<T>::getTransposed( CMatrix4<T>& o ) const
        {
                o[ 0] = M[ 0];
                o[ 1] = M[ 4];
                o[ 2] = M[ 8];
                o[ 3] = M[12];

                o[ 4] = M[ 1];
                o[ 5] = M[ 5];
                o[ 6] = M[ 9];
                o[ 7] = M[13];

                o[ 8] = M[ 2];
                o[ 9] = M[ 6];
                o[10] = M[10];
                o[11] = M[14];

                o[12] = M[ 3];
                o[13] = M[ 7];
                o[14] = M[11];
                o[15] = M[15];
                o.definitelyIdentityMatrix=definitelyIdentityMatrix;
        }


        // used to scale <-1,-1><1,1> to viewport
        template <class T>
        inline void CMatrix4<T>::buildNDCToDCMatrix( const core::rect<s32>& viewport, f32 zScale)
        {
                f32 scaleX = (viewport.getWidth() - 0.75f ) / 2.0f;
                f32 scaleY = -(viewport.getHeight() - 0.75f ) / 2.0f;

                f32 dx = -0.5f + ( (viewport.UpperLeftCorner.X + viewport.LowerRightCorner.X ) / 2.0f );
                f32 dy = -0.5f + ( (viewport.UpperLeftCorner.Y + viewport.LowerRightCorner.Y ) / 2.0f );

                makeIdentity();
                M[0] = (T)scaleX;
                M[5] = (T)scaleY;
                M[10] = (T)zScale;
                M[12] = (T)dx;
                M[13] = (T)dy;
                definitelyIdentityMatrix=false;
        }

        /*!
                Generate texture coordinates as linear functions so that:
                        u = Ux*x + Uy*y + Uz*z + Uw
                        v = Vx*x + Vy*y + Vz*z + Vw
                The matrix M for this case is:
                        Ux  Vx  0  0
                        Uy  Vy  0  0
                        Uz  Vz  0  0
                        Uw  Vw  0  0
        */

        template <class T>
        inline void CMatrix4<T>::buildTextureTransform( f32 rotateRad,
                                        const core::vector2df &rotatecenter,
                                        const core::vector2df &translate,
                                        const core::vector2df &scale)
        {
                const f32 c = cosf(rotateRad);
                const f32 s = sinf(rotateRad);

                M[0] = (T)(c * scale.X);
                M[1] = (T)(s * scale.Y);
                M[2] = 0;
                M[3] = 0;

                M[4] = (T)(-s * scale.X);
                M[5] = (T)(c * scale.Y);
                M[6] = 0;
                M[7] = 0;

                M[8] = (T)(c * scale.X * rotatecenter.X + -s * rotatecenter.Y + translate.X);
                M[9] = (T)(s * scale.Y * rotatecenter.X +  c * rotatecenter.Y + translate.Y);
                M[10] = 1;
                M[11] = 0;

                M[12] = 0;
                M[13] = 0;
                M[14] = 0;
                M[15] = 1;
                definitelyIdentityMatrix=false;
        }

        //! rotate about z axis, center ( 0.5, 0.5 )
        template <class T>
        inline void CMatrix4<T>::setTextureRotationCenter( f32 rotateRad )
        {
                const f32 c = cosf(rotateRad);
                const f32 s = sinf(rotateRad);
                M[0] = (T)c;
                M[1] = (T)s;
                M[2] = (T)(-0.5f * ( c + s) + 0.5f);

                M[4] = (T)-s;
                M[5] = (T)c;
                M[6] = (T)(-0.5f * (-s + c) + 0.5f);
                definitelyIdentityMatrix=false;
        }

        template <class T>
        inline void CMatrix4<T>::setTextureTranslate ( f32 x, f32 y )
        {
                M[8] = (T)x;
                M[9] = (T)y;
                definitelyIdentityMatrix = definitelyIdentityMatrix && (x==0.0f) && (y==0.0f) ;
        }

        template <class T>
        inline void CMatrix4<T>::setTextureScale ( f32 sx, f32 sy )
        {
                M[0] = (T)sx;
                M[5] = (T)sy;
                definitelyIdentityMatrix = definitelyIdentityMatrix && (sx==1.0f) && (sy==1.0f) ;
        }

        template <class T>
        inline void CMatrix4<T>::setTextureScaleCenter( f32 sx, f32 sy )
        {
                M[0] = (T)sx;
                M[2] = (T)(-0.5f * sx + 0.5f);
                M[5] = (T)sy;
                M[6] = (T)(-0.5f * sy + 0.5f);
                definitelyIdentityMatrix = definitelyIdentityMatrix && (sx==1.0f) && (sy==1.0f) ;
        }

        //! sets all matrix data members at once
        template <class T>
        inline void CMatrix4<T>::setM(const T* data)
        {
                for (u32 i = 0; i < 16; ++i)
                        M[i] = data[i];

                definitelyIdentityMatrix = false;
        }

        //! sets if the matrix is definitely identity matrix
        template <class T>
        inline void CMatrix4<T>::setDefinitelyIdentityMatrix( bool isDefinitelyIdentityMatrix)
        {
                definitelyIdentityMatrix = isDefinitelyIdentityMatrix;
        }

        //! gets if the matrix is definitely identity matrix
        template <class T>
        inline bool CMatrix4<T>::getDefinitelyIdentityMatrix() const
        {
                return definitelyIdentityMatrix;
        }

        //! Multiply by scalar.
        template <class T>
        inline CMatrix4<T> operator*(const T scalar, const CMatrix4<T>& mat)
        {
                return mat*scalar;
        }

        typedef CMatrix4<f32> matrix4;
        const matrix4 IdentityMatrix(matrix4::EM4CONST_IDENTITY);

} // end namespace core
} // end namespace irr

#endif