1 /* $Id: xform.h,v 1.4 1997/04/02 03:15:02 brianp Exp $ */ 2 3 /* 4 * Mesa 3-D graphics library 5 * Version: 2.0 6 * Copyright (C) 1995-1996 Brian Paul 7 * 8 * This library is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Library General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This library is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Library General Public License for more details. 17 * 18 * You should have received a copy of the GNU Library General Public 19 * License along with this library; if not, write to the Free 20 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 24 /* 25 * $Log: xform.h,v $ 26 * Revision 1.4 1997/04/02 03:15:02 brianp 27 * removed gl_xform_texcoords_4fv() 28 * 29 * Revision 1.3 1996/11/08 02:20:39 brianp 30 * added gl_xform_texcoords_4fv() 31 * 32 * Revision 1.2 1996/11/04 01:39:46 brianp 33 * removed MAP_X(), MAP_Y() and MAP_Z() macros 34 * 35 * Revision 1.1 1996/09/13 01:38:16 brianp 36 * Initial revision 37 * 38 */ 39 40 41 #ifndef XFORM_H 42 #define XFORM_H 43 44 45 #include "types.h" 46 47 48 /* 49 * Transform a point (column vector) by a matrix: Q = M * P 50 */ 51 #define TRANSFORM_POINT( Q, M, P ) \ 52 Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] * P[2] + M[12] * P[3]; \ 53 Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] * P[2] + M[13] * P[3]; \ 54 Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14] * P[3]; \ 55 Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15] * P[3]; 56 57 58 /* 59 * Transform a normal (row vector) by a matrix: [NX NY NZ] = N * MAT 60 */ 61 #define TRANSFORM_NORMAL( NX, NY, NZ, N, MAT ) \ 62 NX = N[0] * MAT[0] + N[1] * MAT[1] + N[2] * MAT[2]; \ 63 NY = N[0] * MAT[4] + N[1] * MAT[5] + N[2] * MAT[6]; \ 64 NZ = N[0] * MAT[8] + N[1] * MAT[9] + N[2] * MAT[10]; \ 65 66 67 68 extern void gl_xform_points_4fv( GLuint n, GLfloat q[][4], const GLfloat m[16], 69 GLfloat p[][4] ); 70 71 72 extern void gl_xform_points_3fv( GLuint n, GLfloat q[][4], const GLfloat m[16], 73 GLfloat p[][3] ); 74 75 76 extern void gl_xform_normals_3fv( GLuint n, GLfloat v[][3], 77 const GLfloat m[16], 78 GLfloat u[][3], GLboolean normalize ); 79 80 81 extern void gl_transform_vector( GLfloat u[4], 82 const GLfloat v[4], const GLfloat m[16] ); 83 84 85 #endif 86