reactos/lib/mesa32/src/math/m_xform.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  5.1
   4  *
   5  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /*
  27  * Matrix/vertex/vector transformation stuff
  28  *
  29  *
  30  * NOTES:
  31  * 1. 4x4 transformation matrices are stored in memory in column major order.
  32  * 2. Points/vertices are to be thought of as column vectors.
  33  * 3. Transformation of a point p by a matrix M is: p' = M * p
  34  */
  35
  36 #include "glheader.h"
  37 #include "macros.h"
  38
  39 #include "m_eval.h"
  40 #include "m_matrix.h"
  41 #include "m_translate.h"
  42 #include "m_xform.h"
  43 #include "mathmod.h"
  44
  45
  46 #ifdef DEBUG
  47 #include "m_debug.h"
  48 #endif
  49
  50 #ifdef USE_X86_ASM
  51 #include "x86/common_x86_asm.h"
  52 #endif
  53
  54 #ifdef USE_SPARC_ASM
  55 #include "sparc/sparc.h"
  56 #endif
  57
  58 clip_func _mesa_clip_tab[5];
  59 clip_func _mesa_clip_np_tab[5];
  60 dotprod_func _mesa_dotprod_tab[5];
  61 vec_copy_func _mesa_copy_tab[0x10];
  62 normal_func _mesa_normal_tab[0xf];
  63 transform_func *_mesa_transform_tab[5];
  64
  65
  66 /* Raw data format used for:
  67  *    - Object-to-eye transform prior to culling, although this too
  68  *      could be culled under some circumstances.
  69  *    - Eye-to-clip transform (via the function above).
  70  *    - Cliptesting
  71  *    - And everything else too, if culling happens to be disabled.
  72  *
  73  * GH: It's used for everything now, as clipping/culling is done
  74  *     elsewhere (most often by the driver itself).
  75  */
  76 #define TAG(x) x
  77 #define TAG2(x,y) x##y
  78 #define STRIDE_LOOP for ( i = 0 ; i < count ; i++, STRIDE_F(from, stride) )
  79 #define LOOP for ( i = 0 ; i < n ; i++ )
  80 #define ARGS
  81 #include "m_xform_tmp.h"
  82 #include "m_clip_tmp.h"
  83 #include "m_norm_tmp.h"
  84 #include "m_dotprod_tmp.h"
  85 #include "m_copy_tmp.h"
  86 #undef TAG
  87 #undef TAG2
  88 #undef LOOP
  89 #undef ARGS
  90
  91
  92
  93
  94 GLvector4f *_mesa_project_points( GLvector4f *proj_vec,
  95                                   const GLvector4f *clip_vec )
  96 {
  97    const GLuint stride = clip_vec->stride;
  98    const GLfloat *from = (GLfloat *)clip_vec->start;
  99    const GLuint count = clip_vec->count;
 100    GLfloat (*vProj)[4] = (GLfloat (*)[4])proj_vec->start;
 101    GLuint i;
 102
 103    for (i = 0 ; i < count ; i++, STRIDE_F(from, stride))
 104    {
 105          GLfloat oow = 1.0F / from[3];
 106          vProj[i][3] = oow;
 107          vProj[i][0] = from[0] * oow;
 108          vProj[i][1] = from[1] * oow;
 109          vProj[i][2] = from[2] * oow;
 110    }
 111
 112    proj_vec->flags |= VEC_SIZE_4;
 113    proj_vec->size = 3;
 114    proj_vec->count = clip_vec->count;
 115    return proj_vec;
 116 }
 117
 118
 119
 120
 121
 122
 123 /*
 124  * Transform a 4-element row vector (1x4 matrix) by a 4x4 matrix.  This
 125  * function is used for transforming clipping plane equations and spotlight
 126  * directions.
 127  * Mathematically,  u = v * m.
 128  * Input:  v - input vector
 129  *         m - transformation matrix
 130  * Output:  u - transformed vector
 131  */
 132 void _mesa_transform_vector( GLfloat u[4], const GLfloat v[4], const GLfloat m[16] )
 133 {
 134    GLfloat v0=v[0], v1=v[1], v2=v[2], v3=v[3];
 135 #define M(row,col)  m[row + col*4]
 136    u[0] = v0 * M(0,0) + v1 * M(1,0) + v2 * M(2,0) + v3 * M(3,0);
 137    u[1] = v0 * M(0,1) + v1 * M(1,1) + v2 * M(2,1) + v3 * M(3,1);
 138    u[2] = v0 * M(0,2) + v1 * M(1,2) + v2 * M(2,2) + v3 * M(3,2);
 139    u[3] = v0 * M(0,3) + v1 * M(1,3) + v2 * M(2,3) + v3 * M(3,3);
 140 #undef M
 141 }
 142
 143
 144 /* Useful for one-off point transformations, as in clipping.
 145  * Note that because the matrix isn't analysed we do too many
 146  * multiplies, and that the result is always 4-clean.
 147  */
 148 void _mesa_transform_point_sz( GLfloat Q[4], const GLfloat M[16],
 149                             const GLfloat P[4], GLuint sz )
 150 {
 151    if (Q == P)
 152       return;
 153
 154    if (sz == 4)
 155    {
 156       Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] *  P[2] + M[12] * P[3];
 157       Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] *  P[2] + M[13] * P[3];
 158       Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14] * P[3];
 159       Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15] * P[3];
 160    }
 161    else if (sz == 3)
 162    {
 163       Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] *  P[2] + M[12];
 164       Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] *  P[2] + M[13];
 165       Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14];
 166       Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15];
 167    }
 168    else if (sz == 2)
 169    {
 170       Q[0] = M[0] * P[0] + M[4] * P[1] +                M[12];
 171       Q[1] = M[1] * P[0] + M[5] * P[1] +                M[13];
 172       Q[2] = M[2] * P[0] + M[6] * P[1] +                M[14];
 173       Q[3] = M[3] * P[0] + M[7] * P[1] +                M[15];
 174    }
 175    else if (sz == 1)
 176    {
 177       Q[0] = M[0] * P[0] +                              M[12];
 178       Q[1] = M[1] * P[0] +                              M[13];
 179       Q[2] = M[2] * P[0] +                              M[14];
 180       Q[3] = M[3] * P[0] +                              M[15];
 181    }
 182 }
 183
 184
 185 /*
 186  * This is called only once.  It initializes several tables with pointers
 187  * to optimized transformation functions.  This is where we can test for
 188  * AMD 3Dnow! capability, Intel SSE, etc. and hook in the right code.
 189  */
 190 void
 191 _math_init_transformation( void )
 192 {
 193    init_c_transformations();
 194    init_c_norm_transform();
 195    init_c_cliptest();
 196    init_copy0();
 197    init_dotprod();
 198
 199 #ifdef DEBUG
 200    _math_test_all_transform_functions( "default" );
 201    _math_test_all_normal_transform_functions( "default" );
 202    _math_test_all_cliptest_functions( "default" );
 203 #endif
 204
 205 #ifdef USE_X86_ASM
 206    _mesa_init_all_x86_transform_asm();
 207 #endif
 208 #ifdef USE_SPARC_ASM
 209    _mesa_init_all_sparc_transform_asm();
 210 #endif
 211 }
 212
 213 void
 214 _math_init( void )
 215 {
 216    _math_init_transformation();
 217    _math_init_translate();
 218    _math_init_eval();
 219 }