src/mesa/math/m_xform.c

   1 /* $Id: m_xform.c,v 1.18 2002/10/24 23:57:24 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 /*
  29  * Matrix/vertex/vector transformation stuff
  30  *
  31  *
  32  * NOTES:
  33  * 1. 4x4 transformation matrices are stored in memory in column major order.
  34  * 2. Points/vertices are to be thought of as column vectors.
  35  * 3. Transformation of a point p by a matrix M is: p' = M * p
  36  */
  37
  38 #include "glheader.h"
  39 #include "macros.h"
  40 #include "mmath.h"
  41
  42 #include "m_eval.h"
  43 #include "m_matrix.h"
  44 #include "m_translate.h"
  45 #include "m_xform.h"
  46 #include "mathmod.h"
  47
  48
  49 #ifdef DEBUG
  50 #include "m_debug.h"
  51 #endif
  52
  53 #ifdef USE_X86_ASM
  54 #include "X86/common_x86_asm.h"
  55 #endif
  56
  57 #ifdef USE_SPARC_ASM
  58 #include "SPARC/sparc.h"
  59 #endif
  60
  61 clip_func _mesa_clip_tab[5];
  62 clip_func _mesa_clip_np_tab[5];
  63 dotprod_func _mesa_dotprod_tab[5];
  64 vec_copy_func _mesa_copy_tab[0x10];
  65 normal_func _mesa_normal_tab[0xf];
  66 transform_func *_mesa_transform_tab[5];
  67
  68
  69 /* Raw data format used for:
  70  *    - Object-to-eye transform prior to culling, although this too
  71  *      could be culled under some circumstances.
  72  *    - Eye-to-clip transform (via the function above).
  73  *    - Cliptesting
  74  *    - And everything else too, if culling happens to be disabled.
  75  *
  76  * GH: It's used for everything now, as clipping/culling is done
  77  *     elsewhere (most often by the driver itself).
  78  */
  79 #define TAG(x) x
  80 #define TAG2(x,y) x##y
  81 #define STRIDE_LOOP for ( i = 0 ; i < count ; i++, STRIDE_F(from, stride) )
  82 #define LOOP for ( i = 0 ; i < n ; i++ )
  83 #define ARGS
  84 #include "m_xform_tmp.h"
  85 #include "m_clip_tmp.h"
  86 #include "m_norm_tmp.h"
  87 #include "m_dotprod_tmp.h"
  88 #include "m_copy_tmp.h"
  89 #undef TAG
  90 #undef TAG2
  91 #undef LOOP
  92 #undef ARGS
  93
  94
  95
  96
  97 GLvector4f *_mesa_project_points( GLvector4f *proj_vec,
  98                                   const GLvector4f *clip_vec )
  99 {
 100    const GLuint stride = clip_vec->stride;
 101    const GLfloat *from = (GLfloat *)clip_vec->start;
 102    const GLuint count = clip_vec->count;
 103    GLfloat (*vProj)[4] = (GLfloat (*)[4])proj_vec->start;
 104    GLuint i;
 105
 106    for (i = 0 ; i < count ; i++, STRIDE_F(from, stride))
 107    {
 108          GLfloat oow = 1.0F / from[3];
 109          vProj[i][3] = oow;
 110          vProj[i][0] = from[0] * oow;
 111          vProj[i][1] = from[1] * oow;
 112          vProj[i][2] = from[2] * oow;
 113    }
 114
 115    proj_vec->flags |= VEC_SIZE_4;
 116    proj_vec->size = 3;
 117    proj_vec->count = clip_vec->count;
 118    return proj_vec;
 119 }
 120
 121
 122
 123
 124
 125
 126 /*
 127  * Transform a 4-element row vector (1x4 matrix) by a 4x4 matrix.  This
 128  * function is used for transforming clipping plane equations and spotlight
 129  * directions.
 130  * Mathematically,  u = v * m.
 131  * Input:  v - input vector
 132  *         m - transformation matrix
 133  * Output:  u - transformed vector
 134  */
 135 void _mesa_transform_vector( GLfloat u[4], const GLfloat v[4], const GLfloat m[16] )
 136 {
 137    GLfloat v0=v[0], v1=v[1], v2=v[2], v3=v[3];
 138 #define M(row,col)  m[row + col*4]
 139    u[0] = v0 * M(0,0) + v1 * M(1,0) + v2 * M(2,0) + v3 * M(3,0);
 140    u[1] = v0 * M(0,1) + v1 * M(1,1) + v2 * M(2,1) + v3 * M(3,1);
 141    u[2] = v0 * M(0,2) + v1 * M(1,2) + v2 * M(2,2) + v3 * M(3,2);
 142    u[3] = v0 * M(0,3) + v1 * M(1,3) + v2 * M(2,3) + v3 * M(3,3);
 143 #undef M
 144 }
 145
 146
 147 /* Useful for one-off point transformations, as in clipping.
 148  * Note that because the matrix isn't analysed we do too many
 149  * multiplies, and that the result is always 4-clean.
 150  */
 151 void _mesa_transform_point_sz( GLfloat Q[4], const GLfloat M[16],
 152                             const GLfloat P[4], GLuint sz )
 153 {
 154    if (Q == P)
 155       return;
 156
 157    if (sz == 4)
 158    {
 159       Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] *  P[2] + M[12] * P[3];
 160       Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] *  P[2] + M[13] * P[3];
 161       Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14] * P[3];
 162       Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15] * P[3];
 163    }
 164    else if (sz == 3)
 165    {
 166       Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] *  P[2] + M[12];
 167       Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] *  P[2] + M[13];
 168       Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14];
 169       Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15];
 170    }
 171    else if (sz == 2)
 172    {
 173       Q[0] = M[0] * P[0] + M[4] * P[1] +                M[12];
 174       Q[1] = M[1] * P[0] + M[5] * P[1] +                M[13];
 175       Q[2] = M[2] * P[0] + M[6] * P[1] +                M[14];
 176       Q[3] = M[3] * P[0] + M[7] * P[1] +                M[15];
 177    }
 178    else if (sz == 1)
 179    {
 180       Q[0] = M[0] * P[0] +                              M[12];
 181       Q[1] = M[1] * P[0] +                              M[13];
 182       Q[2] = M[2] * P[0] +                              M[14];
 183       Q[3] = M[3] * P[0] +                              M[15];
 184    }
 185 }
 186
 187
 188 /*
 189  * This is called only once.  It initializes several tables with pointers
 190  * to optimized transformation functions.  This is where we can test for
 191  * AMD 3Dnow! capability, Intel Katmai, etc. and hook in the right code.
 192  */
 193 void
 194 _math_init_transformation( void )
 195 {
 196    init_c_transformations();
 197    init_c_norm_transform();
 198    init_c_cliptest();
 199    init_copy0();
 200    init_dotprod();
 201
 202 #ifdef DEBUG
 203    _math_test_all_transform_functions( "default" );
 204    _math_test_all_normal_transform_functions( "default" );
 205    _math_test_all_cliptest_functions( "default" );
 206 #endif
 207
 208 #ifdef USE_X86_ASM
 209    _mesa_init_all_x86_transform_asm();
 210 #endif
 211 #ifdef USE_SPARC_ASM
 212    _mesa_init_all_sparc_transform_asm();
 213 #endif
 214 }
 215
 216 void
 217 _math_init( void )
 218 {
 219    _math_init_transformation();
 220    _math_init_translate();
 221    _math_init_eval();
 222 }