175 lines
8.6 KiB
C++
175 lines
8.6 KiB
C++
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/*
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** Command & Conquer Renegade(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/***********************************************************************************************
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*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
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***********************************************************************************************
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* *
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* Project Name : WWMath *
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* *
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* $Archive:: /Commando/Code/wwmath/matrix4.cpp $*
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* *
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* Author:: Greg_h *
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* *
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* $Modtime:: 11/13/99 10:50a $*
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* *
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* $Revision:: 5 $*
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* *
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*---------------------------------------------------------------------------------------------*
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* Functions: *
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* Matrix4::Multiply -- Multiply two Matrix4's together *
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* Matrix4::Multiply -- Multiply a Matrix3D * Matrix4 *
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* Matrix4::Multiply -- Multiply a Matrix4 * Matrix3D *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#include "matrix4.h"
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#include <assert.h>
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/***********************************************************************************************
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* Matrix4::Multiply -- Multiply two Matrix4's together *
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* *
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* INPUT: *
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* a - first operand *
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* b - second operand *
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* res - pointer to matrix to store the result in (must not point to a or b) *
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* *
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* OUTPUT: *
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* *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 11/13/99 gth : Created. *
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*=============================================================================================*/
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void Matrix4::Multiply(const Matrix4 &a,const Matrix4 &b,Matrix4 * res)
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{
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assert(res != &a);
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assert(res != &b);
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#define ROWCOL(i,j) a[i][0]*b[0][j] + a[i][1]*b[1][j] + a[i][2]*b[2][j] + a[i][3]*b[3][j]
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(*res)[0][0] = ROWCOL(0,0);
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(*res)[0][1] = ROWCOL(0,1);
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(*res)[0][2] = ROWCOL(0,2);
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(*res)[0][3] = ROWCOL(0,3);
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(*res)[1][0] = ROWCOL(1,0);
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(*res)[1][1] = ROWCOL(1,1);
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(*res)[1][2] = ROWCOL(1,2);
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(*res)[1][3] = ROWCOL(1,3);
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(*res)[2][0] = ROWCOL(2,0);
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(*res)[2][1] = ROWCOL(2,1);
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(*res)[2][2] = ROWCOL(2,2);
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(*res)[2][3] = ROWCOL(2,3);
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(*res)[3][0] = ROWCOL(3,0);
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(*res)[3][1] = ROWCOL(3,1);
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(*res)[3][2] = ROWCOL(3,2);
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(*res)[3][3] = ROWCOL(3,3);
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#undef ROWCOL
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}
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/***********************************************************************************************
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* Matrix4::Multiply -- Multiply a Matrix3D * Matrix4 *
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* *
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* INPUT: *
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* *
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* OUTPUT: *
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* *
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* WARNINGS: *
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* *
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* HISTORY: *
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* 11/13/99 gth : Created. *
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*=============================================================================================*/
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void Matrix4::Multiply(const Matrix3D &a,const Matrix4 &b,Matrix4 * res)
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{
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assert(res != &b);
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#define ROWCOL(i,j) a[i][0]*b[0][j] + a[i][1]*b[1][j] + a[i][2]*b[2][j] + a[i][3]*b[3][j]
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(*res)[0][0] = ROWCOL(0,0);
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(*res)[0][1] = ROWCOL(0,1);
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(*res)[0][2] = ROWCOL(0,2);
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(*res)[0][3] = ROWCOL(0,3);
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(*res)[1][0] = ROWCOL(1,0);
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(*res)[1][1] = ROWCOL(1,1);
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(*res)[1][2] = ROWCOL(1,2);
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(*res)[1][3] = ROWCOL(1,3);
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(*res)[2][0] = ROWCOL(2,0);
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(*res)[2][1] = ROWCOL(2,1);
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(*res)[2][2] = ROWCOL(2,2);
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(*res)[2][3] = ROWCOL(2,3);
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(*res)[3][0] = b[3][0]; // last row of a is 0,0,0,1
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(*res)[3][1] = b[3][1]; // this leaves the last row of b unchanged
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(*res)[3][2] = b[3][2];
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(*res)[3][3] = b[3][3];
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#undef ROWCOL
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}
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/***********************************************************************************************
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* Matrix4::Multiply -- Multiply a Matrix4 * Matrix3D *
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* *
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* INPUT: *
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* *
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* OUTPUT: *
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* *
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* WARNINGS: *
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* *
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* HISTORY: *
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*=============================================================================================*/
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void Matrix4::Multiply(const Matrix4 & a,const Matrix3D & b,Matrix4 * res)
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{
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assert(res != &a);
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// ROWCOL multiplies a row of 'a' by one of the first three columns of 'b' (4th entry in b is zero)
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// ROWCOL4 multiplies a row of 'a' by the fourth column of 'b' (4th entry in b is one)
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#define ROWCOL(i,j) a[i][0]*b[0][j] + a[i][1]*b[1][j] + a[i][2]*b[2][j]
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#define ROWCOL4(i,j) a[i][0]*b[0][j] + a[i][1]*b[1][j] + a[i][2]*b[2][j] + a[i][3]
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(*res)[0][0] = ROWCOL(0,0);
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(*res)[0][1] = ROWCOL(0,1);
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(*res)[0][2] = ROWCOL(0,2);
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(*res)[0][3] = ROWCOL4(0,3);
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(*res)[1][0] = ROWCOL(1,0);
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(*res)[1][1] = ROWCOL(1,1);
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(*res)[1][2] = ROWCOL(1,2);
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(*res)[1][3] = ROWCOL4(1,3);
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(*res)[2][0] = ROWCOL(2,0);
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(*res)[2][1] = ROWCOL(2,1);
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(*res)[2][2] = ROWCOL(2,2);
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(*res)[2][3] = ROWCOL4(2,3);
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(*res)[3][0] = ROWCOL(3,0);
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(*res)[3][1] = ROWCOL(3,1);
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(*res)[3][2] = ROWCOL(3,2);
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(*res)[3][3] = ROWCOL4(3,3);
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#undef ROWCOL
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#undef ROWCOL4
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}
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