src/mesa/math/m_debug_clip.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.1
   4  *
   5  * Copyright (C) 1999-2005  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  * Authors:
  25  *    Gareth Hughes
  26  */
  27
  28 #include "main/glheader.h"
  29 #include "main/context.h"
  30 #include "main/macros.h"
  31 #include "main/imports.h"
  32
  33 #include "m_matrix.h"
  34 #include "m_xform.h"
  35
  36 #include "m_debug.h"
  37 #include "m_debug_util.h"
  38
  39 #ifdef __UNIXOS2__
  40 /* The linker doesn't like empty files */
  41 static char dummy;
  42 #endif
  43
  44 #ifdef DEBUG_MATH  /* This code only used for debugging */
  45
  46 static clip_func *clip_tab[2] = {
  47    _mesa_clip_tab,
  48    _mesa_clip_np_tab
  49 };
  50 static char *cnames[2] = {
  51    "_mesa_clip_tab",
  52    "_mesa_clip_np_tab"
  53 };
  54 #ifdef RUN_DEBUG_BENCHMARK
  55 static char *cstrings[2] = {
  56    "clip, perspective divide",
  57    "clip, no divide"
  58 };
  59 #endif
  60
  61
  62 /* =============================================================
  63  * Reference cliptests
  64  */
  65
  66 static GLvector4f *ref_cliptest_points4( GLvector4f *clip_vec,
  67                                          GLvector4f *proj_vec,
  68                                          GLubyte clipMask[],
  69                                          GLubyte *orMask,
  70                                          GLubyte *andMask,
  71                                          GLboolean viewport_z_clip )
  72 {
  73    const GLuint stride = clip_vec->stride;
  74    const GLuint count = clip_vec->count;
  75    const GLfloat *from = (GLfloat *)clip_vec->start;
  76    GLuint c = 0;
  77    GLfloat (*vProj)[4] = (GLfloat (*)[4])proj_vec->start;
  78    GLubyte tmpAndMask = *andMask;
  79    GLubyte tmpOrMask = *orMask;
  80    GLuint i;
  81    for ( i = 0 ; i < count ; i++, STRIDE_F(from, stride) ) {
  82       const GLfloat cx = from[0];
  83       const GLfloat cy = from[1];
  84       const GLfloat cz = from[2];
  85       const GLfloat cw = from[3];
  86       GLubyte mask = 0;
  87       if ( -cx + cw < 0 ) mask |= CLIP_RIGHT_BIT;
  88       if (  cx + cw < 0 ) mask |= CLIP_LEFT_BIT;
  89       if ( -cy + cw < 0 ) mask |= CLIP_TOP_BIT;
  90       if (  cy + cw < 0 ) mask |= CLIP_BOTTOM_BIT;
  91       if (viewport_z_clip) {
  92          if ( -cz + cw < 0 ) mask |= CLIP_FAR_BIT;
  93          if (  cz + cw < 0 ) mask |= CLIP_NEAR_BIT;
  94       }
  95       clipMask[i] = mask;
  96       if ( mask ) {
  97          c++;
  98          tmpAndMask &= mask;
  99          tmpOrMask |= mask;
 100          vProj[i][0] = 0;
 101          vProj[i][1] = 0;
 102          vProj[i][2] = 0;
 103          vProj[i][3] = 1;
 104       } else {
 105          GLfloat oow = 1.0F / cw;
 106          vProj[i][0] = cx * oow;
 107          vProj[i][1] = cy * oow;
 108          vProj[i][2] = cz * oow;
 109          vProj[i][3] = oow;
 110       }
 111    }
 112
 113    *orMask = tmpOrMask;
 114    *andMask = (GLubyte) (c < count ? 0 : tmpAndMask);
 115
 116    proj_vec->flags |= VEC_SIZE_4;
 117    proj_vec->size = 4;
 118    proj_vec->count = clip_vec->count;
 119    return proj_vec;
 120 }
 121
 122 /* Keep these here for now, even though we don't use them...
 123  */
 124 static GLvector4f *ref_cliptest_points3( GLvector4f *clip_vec,
 125                                          GLvector4f *proj_vec,
 126                                          GLubyte clipMask[],
 127                                          GLubyte *orMask,
 128                                          GLubyte *andMask,
 129                                          GLboolean viewport_z_clip )
 130 {
 131    const GLuint stride = clip_vec->stride;
 132    const GLuint count = clip_vec->count;
 133    const GLfloat *from = (GLfloat *)clip_vec->start;
 134
 135    GLubyte tmpOrMask = *orMask;
 136    GLubyte tmpAndMask = *andMask;
 137    GLuint i;
 138    for ( i = 0 ; i < count ; i++, STRIDE_F(from, stride) ) {
 139       const GLfloat cx = from[0], cy = from[1], cz = from[2];
 140       GLubyte mask = 0;
 141       if ( cx >  1.0 )          mask |= CLIP_RIGHT_BIT;
 142       else if ( cx < -1.0 )     mask |= CLIP_LEFT_BIT;
 143       if ( cy >  1.0 )          mask |= CLIP_TOP_BIT;
 144       else if ( cy < -1.0 )     mask |= CLIP_BOTTOM_BIT;
 145       if (viewport_z_clip) {
 146          if ( cz >  1.0 )               mask |= CLIP_FAR_BIT;
 147          else if ( cz < -1.0 )  mask |= CLIP_NEAR_BIT;
 148       }
 149       clipMask[i] = mask;
 150       tmpOrMask |= mask;
 151       tmpAndMask &= mask;
 152    }
 153
 154    *orMask = tmpOrMask;
 155    *andMask = tmpAndMask;
 156    return clip_vec;
 157 }
 158
 159 static GLvector4f * ref_cliptest_points2( GLvector4f *clip_vec,
 160                                           GLvector4f *proj_vec,
 161                                           GLubyte clipMask[],
 162                                           GLubyte *orMask,
 163                                           GLubyte *andMask,
 164                                           GLboolean viewport_z_clip )
 165 {
 166    const GLuint stride = clip_vec->stride;
 167    const GLuint count = clip_vec->count;
 168    const GLfloat *from = (GLfloat *)clip_vec->start;
 169
 170    GLubyte tmpOrMask = *orMask;
 171    GLubyte tmpAndMask = *andMask;
 172    GLuint i;
 173
 174    (void) viewport_z_clip;
 175
 176    for ( i = 0 ; i < count ; i++, STRIDE_F(from, stride) ) {
 177       const GLfloat cx = from[0], cy = from[1];
 178       GLubyte mask = 0;
 179       if ( cx >  1.0 )          mask |= CLIP_RIGHT_BIT;
 180       else if ( cx < -1.0 )     mask |= CLIP_LEFT_BIT;
 181       if ( cy >  1.0 )          mask |= CLIP_TOP_BIT;
 182       else if ( cy < -1.0 )     mask |= CLIP_BOTTOM_BIT;
 183       clipMask[i] = mask;
 184       tmpOrMask |= mask;
 185       tmpAndMask &= mask;
 186    }
 187
 188    *orMask = tmpOrMask;
 189    *andMask = tmpAndMask;
 190    return clip_vec;
 191 }
 192
 193 static clip_func ref_cliptest[5] = {
 194    0,
 195    0,
 196    ref_cliptest_points2,
 197    ref_cliptest_points3,
 198    ref_cliptest_points4
 199 };
 200
 201
 202 /* =============================================================
 203  * Cliptest tests
 204  */
 205
 206 ALIGN16(static GLfloat, s[TEST_COUNT][4]);
 207 ALIGN16(static GLfloat, d[TEST_COUNT][4]);
 208 ALIGN16(static GLfloat, r[TEST_COUNT][4]);
 209
 210
 211 static int test_cliptest_function( clip_func func, int np,
 212                                    int psize, long *cycles )
 213 {
 214    GLvector4f source[1], dest[1], ref[1];
 215    GLubyte dm[TEST_COUNT], dco, dca;
 216    GLubyte rm[TEST_COUNT], rco, rca;
 217    int i, j;
 218 #ifdef  RUN_DEBUG_BENCHMARK
 219    int cycle_i;                /* the counter for the benchmarks we run */
 220 #endif
 221    GLboolean viewport_z_clip = GL_TRUE;
 222
 223    (void) cycles;
 224
 225    if ( psize > 4 ) {
 226       _mesa_problem( NULL, "test_cliptest_function called with psize > 4\n" );
 227       return 0;
 228    }
 229
 230    for ( i = 0 ; i < TEST_COUNT ; i++) {
 231       ASSIGN_4V( d[i], 0.0, 0.0, 0.0, 1.0 );
 232       ASSIGN_4V( s[i], 0.0, 0.0, 0.0, 1.0 );
 233       for ( j = 0 ; j < psize ; j++ )
 234          s[i][j] = rnd();
 235    }
 236
 237    source->data = (GLfloat(*)[4])s;
 238    source->start = (GLfloat *)s;
 239    source->count = TEST_COUNT;
 240    source->stride = sizeof(s[0]);
 241    source->size = 4;
 242    source->flags = 0;
 243
 244    dest->data = (GLfloat(*)[4])d;
 245    dest->start = (GLfloat *)d;
 246    dest->count = TEST_COUNT;
 247    dest->stride = sizeof(float[4]);
 248    dest->size = 0;
 249    dest->flags = 0;
 250
 251    ref->data = (GLfloat(*)[4])r;
 252    ref->start = (GLfloat *)r;
 253    ref->count = TEST_COUNT;
 254    ref->stride = sizeof(float[4]);
 255    ref->size = 0;
 256    ref->flags = 0;
 257
 258    dco = rco = 0;
 259    dca = rca = CLIP_FRUSTUM_BITS;
 260
 261    ref_cliptest[psize]( source, ref, rm, &rco, &rca, viewport_z_clip );
 262
 263    if ( mesa_profile ) {
 264       BEGIN_RACE( *cycles );
 265       func( source, dest, dm, &dco, &dca, viewport_z_clip );
 266       END_RACE( *cycles );
 267    }
 268    else {
 269       func( source, dest, dm, &dco, &dca, viewport_z_clip );
 270    }
 271
 272    if ( dco != rco ) {
 273       printf( "\n-----------------------------\n" );
 274       printf( "dco = 0x%02x   rco = 0x%02x\n", dco, rco );
 275       return 0;
 276    }
 277    if ( dca != rca ) {
 278       printf( "\n-----------------------------\n" );
 279       printf( "dca = 0x%02x   rca = 0x%02x\n", dca, rca );
 280       return 0;
 281    }
 282    for ( i = 0 ; i < TEST_COUNT ; i++ ) {
 283       if ( dm[i] != rm[i] ) {
 284          printf( "\n-----------------------------\n" );
 285          printf( "(i = %i)\n", i );
 286          printf( "dm = 0x%02x   rm = 0x%02x\n", dm[i], rm[i] );
 287          return 0;
 288       }
 289    }
 290
 291    /* Only verify output on projected points4 case.  FIXME: Do we need
 292     * to test other cases?
 293     */
 294    if ( np || psize < 4 )
 295       return 1;
 296
 297    for ( i = 0 ; i < TEST_COUNT ; i++ ) {
 298       for ( j = 0 ; j < 4 ; j++ ) {
 299          if ( significand_match( d[i][j], r[i][j] ) < REQUIRED_PRECISION ) {
 300             printf( "\n-----------------------------\n" );
 301             printf( "(i = %i, j = %i)  dm = 0x%02x   rm = 0x%02x\n",
 302                     i, j, dm[i], rm[i] );
 303             printf( "%f \t %f \t [diff = %e - %i bit missed]\n",
 304                     d[i][0], r[i][0], r[i][0]-d[i][0],
 305                     MAX_PRECISION - significand_match( d[i][0], r[i][0] ) );
 306             printf( "%f \t %f \t [diff = %e - %i bit missed]\n",
 307                     d[i][1], r[i][1], r[i][1]-d[i][1],
 308                     MAX_PRECISION - significand_match( d[i][1], r[i][1] ) );
 309             printf( "%f \t %f \t [diff = %e - %i bit missed]\n",
 310                     d[i][2], r[i][2], r[i][2]-d[i][2],
 311                     MAX_PRECISION - significand_match( d[i][2], r[i][2] ) );
 312             printf( "%f \t %f \t [diff = %e - %i bit missed]\n",
 313                     d[i][3], r[i][3], r[i][3]-d[i][3],
 314                     MAX_PRECISION - significand_match( d[i][3], r[i][3] ) );
 315             return 0;
 316          }
 317       }
 318    }
 319
 320    return 1;
 321 }
 322
 323 void _math_test_all_cliptest_functions( char *description )
 324 {
 325    int np, psize;
 326    long benchmark_tab[2][4];
 327    static int first_time = 1;
 328
 329    if ( first_time ) {
 330       first_time = 0;
 331       mesa_profile = _mesa_getenv( "MESA_PROFILE" );
 332    }
 333
 334 #ifdef RUN_DEBUG_BENCHMARK
 335    if ( mesa_profile ) {
 336       if ( !counter_overhead ) {
 337          INIT_COUNTER();
 338          printf( "counter overhead: %ld cycles\n\n", counter_overhead );
 339       }
 340       printf( "cliptest results after hooking in %s functions:\n", description );
 341    }
 342 #endif
 343
 344 #ifdef RUN_DEBUG_BENCHMARK
 345    if ( mesa_profile ) {
 346       printf( "\n\t" );
 347       for ( psize = 2 ; psize <= 4 ; psize++ ) {
 348          printf( " p%d\t", psize );
 349       }
 350       printf( "\n--------------------------------------------------------\n\t" );
 351    }
 352 #endif
 353
 354    for ( np = 0 ; np < 2 ; np++ ) {
 355       for ( psize = 2 ; psize <= 4 ; psize++ ) {
 356          clip_func func = clip_tab[np][psize];
 357          long *cycles = &(benchmark_tab[np][psize-1]);
 358
 359          if ( test_cliptest_function( func, np, psize, cycles ) == 0 ) {
 360             char buf[100];
 361             sprintf( buf, "%s[%d] failed test (%s)",
 362                      cnames[np], psize, description );
 363             _mesa_problem( NULL, buf );
 364          }
 365 #ifdef RUN_DEBUG_BENCHMARK
 366          if ( mesa_profile )
 367             printf( " %li\t", benchmark_tab[np][psize-1] );
 368 #endif
 369       }
 370 #ifdef RUN_DEBUG_BENCHMARK
 371       if ( mesa_profile )
 372          printf( " | [%s]\n\t", cstrings[np] );
 373 #endif
 374    }
 375 #ifdef RUN_DEBUG_BENCHMARK
 376    if ( mesa_profile )
 377       printf( "\n" );
 378 #endif
 379 }
 380
 381
 382 #endif /* DEBUG_MATH */