src/mesa/math/m_xform.c

   1 /* $Id: m_xform.c,v 1.8 2001/02/03 08:41:04 gareth Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2000  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 <math.h>
  39
  40 #include "glheader.h"
  41 #include "macros.h"
  42 #include "mmath.h"
  43
  44 #include "m_eval.h"
  45 #include "m_matrix.h"
  46 #include "m_translate.h"
  47 #include "m_xform.h"
  48 #include "mathmod.h"
  49
  50
  51 #ifdef DEBUG
  52 #include "m_debug.h"
  53 #endif
  54
  55 #ifdef USE_X86_ASM
  56 #include "X86/common_x86_asm.h"
  57 #endif
  58
  59 clip_func gl_clip_tab[5];
  60 clip_func gl_clip_np_tab[5];
  61 dotprod_func gl_dotprod_tab[2][5];
  62 vec_copy_func gl_copy_tab[2][0x10];
  63 normal_func gl_normal_tab[0xf][0x4];
  64 transform_func **(gl_transform_tab[2]);
  65 static transform_func *cull_transform_tab[5];
  66 static transform_func *raw_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 #define TAG(x) x##_raw
  77 #define TAG2(x,y) x##y##_raw
  78 #define IDX 0
  79 #define STRIDE_LOOP for (i=0;i<count;i++, STRIDE_F(from, stride))
  80 #define LOOP for (i=0;i<n;i++)
  81 #define CULL_CHECK
  82 #define CLIP_CHECK
  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 CULL_CHECK
  93 #undef CLIP_CHECK
  94 #undef ARGS
  95 #undef IDX
  96
  97 /* Culled data used for:
  98  *    - texture transformations
  99  *    - viewport map transformation
 100  *    - normal transformations prior to lighting
 101  *    - user cliptests
 102  */
 103 #define TAG(x) x##_masked
 104 #define TAG2(x,y) x##y##_masked
 105 #define IDX 1
 106 #define STRIDE_LOOP for (i=0;i<count;i++, STRIDE_F(from, stride))
 107 #define LOOP for (i=0;i<n;i++)
 108 #define CULL_CHECK if (mask[i])
 109 #define CLIP_CHECK if ((mask[i] & flag) == 0)
 110 #define ARGS , const GLubyte mask[]
 111 #include "m_xform_tmp.h"
 112 #include "m_norm_tmp.h"
 113 #include "m_dotprod_tmp.h"
 114 #include "m_copy_tmp.h"
 115 #undef TAG
 116 #undef TAG2
 117 #undef LOOP
 118 #undef CULL_CHECK
 119 #undef CLIP_CHECK
 120 #undef ARGS
 121 #undef IDX
 122
 123
 124
 125
 126
 127
 128 GLvector4f *gl_project_points( GLvector4f *proj_vec,
 129                                const GLvector4f *clip_vec )
 130 {
 131    const GLuint stride = clip_vec->stride;
 132    const GLfloat *from = (GLfloat *)clip_vec->start;
 133    const GLuint count = clip_vec->count;
 134    GLfloat (*vProj)[4] = (GLfloat (*)[4])proj_vec->start;
 135    GLuint i;
 136
 137    for (i = 0 ; i < count ; i++, STRIDE_F(from, stride))
 138    {
 139          GLfloat oow = 1.0F / from[3];
 140          vProj[i][3] = oow;
 141          vProj[i][0] = from[0] * oow;
 142          vProj[i][1] = from[1] * oow;
 143          vProj[i][2] = from[2] * oow;
 144    }
 145
 146    proj_vec->flags |= VEC_SIZE_4;
 147    proj_vec->size = 3;
 148    proj_vec->count = clip_vec->count;
 149    return proj_vec;
 150 }
 151
 152
 153
 154
 155
 156
 157 /*
 158  * Transform a 4-element row vector (1x4 matrix) by a 4x4 matrix.  This
 159  * function is used for transforming clipping plane equations and spotlight
 160  * directions.
 161  * Mathematically,  u = v * m.
 162  * Input:  v - input vector
 163  *         m - transformation matrix
 164  * Output:  u - transformed vector
 165  */
 166 void gl_transform_vector( GLfloat u[4], const GLfloat v[4], const GLfloat m[16] )
 167 {
 168    GLfloat v0=v[0], v1=v[1], v2=v[2], v3=v[3];
 169 #define M(row,col)  m[row + col*4]
 170    u[0] = v0 * M(0,0) + v1 * M(1,0) + v2 * M(2,0) + v3 * M(3,0);
 171    u[1] = v0 * M(0,1) + v1 * M(1,1) + v2 * M(2,1) + v3 * M(3,1);
 172    u[2] = v0 * M(0,2) + v1 * M(1,2) + v2 * M(2,2) + v3 * M(3,2);
 173    u[3] = v0 * M(0,3) + v1 * M(1,3) + v2 * M(2,3) + v3 * M(3,3);
 174 #undef M
 175 }
 176
 177
 178 /* Useful for one-off point transformations, as in clipping.
 179  * Note that because the matrix isn't analysed we do too many
 180  * multiplies, and that the result is always 4-clean.
 181  */
 182 void gl_transform_point_sz( GLfloat Q[4], const GLfloat M[16],
 183                             const GLfloat P[4], GLuint sz )
 184 {
 185    if (Q == P)
 186       return;
 187
 188    if (sz == 4)
 189    {
 190       Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] *  P[2] + M[12] * P[3];
 191       Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] *  P[2] + M[13] * P[3];
 192       Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14] * P[3];
 193       Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15] * P[3];
 194    }
 195    else if (sz == 3)
 196    {
 197       Q[0] = M[0] * P[0] + M[4] * P[1] + M[8] *  P[2] + M[12];
 198       Q[1] = M[1] * P[0] + M[5] * P[1] + M[9] *  P[2] + M[13];
 199       Q[2] = M[2] * P[0] + M[6] * P[1] + M[10] * P[2] + M[14];
 200       Q[3] = M[3] * P[0] + M[7] * P[1] + M[11] * P[2] + M[15];
 201    }
 202    else if (sz == 2)
 203    {
 204       Q[0] = M[0] * P[0] + M[4] * P[1] +                M[12];
 205       Q[1] = M[1] * P[0] + M[5] * P[1] +                M[13];
 206       Q[2] = M[2] * P[0] + M[6] * P[1] +                M[14];
 207       Q[3] = M[3] * P[0] + M[7] * P[1] +                M[15];
 208    }
 209    else if (sz == 1)
 210    {
 211       Q[0] = M[0] * P[0] +                              M[12];
 212       Q[1] = M[1] * P[0] +                              M[13];
 213       Q[2] = M[2] * P[0] +                              M[14];
 214       Q[3] = M[3] * P[0] +                              M[15];
 215    }
 216 }
 217
 218
 219 /*
 220  * This is called only once.  It initializes several tables with pointers
 221  * to optimized transformation functions.  This is where we can test for
 222  * AMD 3Dnow! capability, Intel Katmai, etc. and hook in the right code.
 223  */
 224 void
 225 _math_init_transformation( void )
 226 {
 227    gl_transform_tab[0] = raw_transform_tab;
 228    gl_transform_tab[1] = cull_transform_tab;
 229
 230    init_c_transformations_raw();
 231    init_c_transformations_masked();
 232    init_c_norm_transform_raw();
 233    init_c_norm_transform_masked();
 234    init_c_cliptest_raw();
 235    init_copy0_raw();
 236    init_copy0_masked();
 237    init_dotprod_raw();
 238    init_dotprod_masked();
 239
 240 #ifdef DEBUG
 241    _math_test_all_transform_functions( "default" );
 242    _math_test_all_normal_transform_functions( "default" );
 243 #endif
 244
 245 #ifdef USE_X86_ASM
 246    gl_init_all_x86_transform_asm();
 247 #endif
 248 }
 249
 250 void
 251 _math_init( void )
 252 {
 253    _math_init_transformation();
 254    _math_init_translate();
 255    _math_init_vertices();
 256    _math_init_eval();
 257 }