MT_CmMatrix4x4.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
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 * The Original Code is: all of this file.
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 * ***** END GPL LICENSE BLOCK *****
 */

#include "MT_CmMatrix4x4.h"
#include "MT_Vector3.h"
#include "MT_Point3.h"


MT_CmMatrix4x4::MT_CmMatrix4x4()
{
    Identity();
}



MT_CmMatrix4x4::MT_CmMatrix4x4(const float value[4][4])
{
    for (int i=0;i<4;i++)
    {
        for (int j=0;j<4;j++)
            m_V[i][j] = value[i][j];
    }
}



MT_CmMatrix4x4::MT_CmMatrix4x4(const double value[16])
{
    for (int i=0;i<16;i++)
        m_Vflat[i] = value[i];
}



MT_CmMatrix4x4::MT_CmMatrix4x4(const MT_CmMatrix4x4& other)
{
    SetMatrix(other);
}



MT_CmMatrix4x4::MT_CmMatrix4x4(const MT_Point3& orig,
                             const MT_Vector3& dir,
                             const MT_Vector3 up)
{
    MT_Vector3 z = -(dir.normalized());
    MT_Vector3 x = (up.cross(z)).normalized();
    MT_Vector3 y = (z.cross(x));
    
    m_V[0][0] = x.x();
    m_V[0][1] = y.x();
    m_V[0][2] = z.x();
    m_V[0][3] = 0.0f;
    
    m_V[1][0] = x.y();
    m_V[1][1] = y.y();
    m_V[1][2] = z.y();
    m_V[1][3] = 0.0f;
    
    m_V[2][0] = x.z();
    m_V[2][1] = y.z();
    m_V[2][2] = z.z();
    m_V[2][3] = 0.0f;
    
    m_V[3][0] = orig.x();//0.0f;
    m_V[3][1] = orig.y();//0.0f;
    m_V[3][2] = orig.z();//0.0f;
    m_V[3][3] = 1.0f;
    
    //Translate(-orig);
}



MT_Vector3 MT_CmMatrix4x4::GetRight() const
{
    return MT_Vector3(m_V[0][0], m_V[0][1], m_V[0][2]);
}



MT_Vector3 MT_CmMatrix4x4::GetUp() const
{
    return MT_Vector3(m_V[1][0], m_V[1][1], m_V[1][2]);
}



MT_Vector3 MT_CmMatrix4x4::GetDir() const
{
    return MT_Vector3(m_V[2][0], m_V[2][1], m_V[2][2]);
}



MT_Point3 MT_CmMatrix4x4::GetPos() const
{
    return MT_Point3(m_V[3][0], m_V[3][1], m_V[3][2]);
}



void MT_CmMatrix4x4::Identity()
{
    for (int i=0; i<4; i++)
    {
        for (int j=0; j<4; j++)
            m_V[i][j] = (i==j?1.0f:0.0f);
    } 
}



void MT_CmMatrix4x4::SetMatrix(const MT_CmMatrix4x4& other)
{
    for (int i=0; i<16; i++)
        m_Vflat[i] = other.m_Vflat[i];
}



double* MT_CmMatrix4x4::getPointer()
{
    return &m_V[0][0];
}



const double* MT_CmMatrix4x4::getPointer() const
{
    return &m_V[0][0];
}   



void MT_CmMatrix4x4::setElem(int pos,double newvalue)
{
    m_Vflat[pos] = newvalue;
}   

MT_CmMatrix4x4 MT_CmMatrix4x4::Perspective(
    MT_Scalar inLeft,
    MT_Scalar inRight,
    MT_Scalar inBottom,
    MT_Scalar inTop,
    MT_Scalar inNear,
    MT_Scalar inFar
){

    MT_CmMatrix4x4 mat;
    
    // Column 0
    mat(0, 0) = -(2.0*inNear)           / (inRight-inLeft);
    mat(1, 0) = 0;
    mat(2, 0) = 0;
    mat(3, 0) = 0;

    // Column 1
    mat(0, 1) = 0;
    mat(1, 1) = (2.0*inNear)            / (inTop-inBottom);
    mat(2, 1) = 0;
    mat(3, 1) = 0;

    // Column 2
    mat(0, 2) =  (inRight+inLeft)       / (inRight-inLeft);
    mat(1, 2) =  (inTop+inBottom)       / (inTop-inBottom);
    mat(2, 2) = -(inFar+inNear)         / (inFar-inNear);
    mat(3, 2) = -1;

    // Column 3
    mat(0, 3) = 0;
    mat(1, 3) = 0;
    mat(2, 3) = -(2.0*inFar*inNear)     / (inFar-inNear);
    mat(3, 3) = 0;

    return mat;
}