src/mesa/vbo/vbo_exec_array.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright 2009 VMware, Inc.
   5  * 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
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * 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
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include "main/glheader.h"
  30 #include "main/context.h"
  31 #include "main/state.h"
  32 #include "main/api_validate.h"
  33 #include "main/api_noop.h"
  34 #include "main/varray.h"
  35 #include "main/bufferobj.h"
  36 #include "glapi/dispatch.h"
  37
  38 #include "vbo_context.h"
  39
  40
  41 /**
  42  * Compute min and max elements for glDraw[Range]Elements() calls.
  43  */
  44 void
  45 vbo_get_minmax_index(GLcontext *ctx,
  46                      const struct _mesa_prim *prim,
  47                      const struct _mesa_index_buffer *ib,
  48                      GLuint *min_index, GLuint *max_index)
  49 {
  50    GLuint i;
  51    GLsizei count = prim->count;
  52    const void *indices;
  53
  54    if (_mesa_is_bufferobj(ib->obj)) {
  55       const GLvoid *map = ctx->Driver.MapBuffer(ctx,
  56                                                 GL_ELEMENT_ARRAY_BUFFER_ARB,
  57                                                 GL_READ_ONLY,
  58                                                 ib->obj);
  59       indices = ADD_POINTERS(map, ib->ptr);
  60    } else {
  61       indices = ib->ptr;
  62    }
  63
  64    switch (ib->type) {
  65    case GL_UNSIGNED_INT: {
  66       const GLuint *ui_indices = (const GLuint *)indices;
  67       GLuint max_ui = ui_indices[count-1];
  68       GLuint min_ui = ui_indices[0];
  69       for (i = 0; i < count; i++) {
  70          if (ui_indices[i] > max_ui) max_ui = ui_indices[i];
  71          if (ui_indices[i] < min_ui) min_ui = ui_indices[i];
  72       }
  73       *min_index = min_ui;
  74       *max_index = max_ui;
  75       break;
  76    }
  77    case GL_UNSIGNED_SHORT: {
  78       const GLushort *us_indices = (const GLushort *)indices;
  79       GLuint max_us = us_indices[count-1];
  80       GLuint min_us = us_indices[0];
  81       for (i = 0; i < count; i++) {
  82          if (us_indices[i] > max_us) max_us = us_indices[i];
  83          if (us_indices[i] < min_us) min_us = us_indices[i];
  84       }
  85       *min_index = min_us;
  86       *max_index = max_us;
  87       break;
  88    }
  89    case GL_UNSIGNED_BYTE: {
  90       const GLubyte *ub_indices = (const GLubyte *)indices;
  91       GLuint max_ub = ub_indices[count-1];
  92       GLuint min_ub = ub_indices[0];
  93       for (i = 0; i < count; i++) {
  94          if (ub_indices[i] > max_ub) max_ub = ub_indices[i];
  95          if (ub_indices[i] < min_ub) min_ub = ub_indices[i];
  96       }
  97       *min_index = min_ub;
  98       *max_index = max_ub;
  99       break;
 100    }
 101    default:
 102       assert(0);
 103       break;
 104    }
 105
 106    if (_mesa_is_bufferobj(ib->obj)) {
 107       ctx->Driver.UnmapBuffer(ctx,
 108                               GL_ELEMENT_ARRAY_BUFFER_ARB,
 109                               ib->obj);
 110    }
 111 }
 112
 113
 114 /**
 115  * Check that element 'j' of the array has reasonable data.
 116  * Map VBO if needed.
 117  */
 118 static void
 119 check_array_data(GLcontext *ctx, struct gl_client_array *array,
 120                  GLuint attrib, GLuint j)
 121 {
 122    if (array->Enabled) {
 123       const void *data = array->Ptr;
 124       if (_mesa_is_bufferobj(array->BufferObj)) {
 125          if (!array->BufferObj->Pointer) {
 126             /* need to map now */
 127             array->BufferObj->Pointer = ctx->Driver.MapBuffer(ctx,
 128                                                               GL_ARRAY_BUFFER_ARB,
 129                                                               GL_READ_ONLY,
 130                                                               array->BufferObj);
 131          }
 132          data = ADD_POINTERS(data, array->BufferObj->Pointer);
 133       }
 134       switch (array->Type) {
 135       case GL_FLOAT:
 136          {
 137             GLfloat *f = (GLfloat *) ((GLubyte *) data + array->StrideB * j);
 138             GLuint k;
 139             for (k = 0; k < array->Size; k++) {
 140                if (IS_INF_OR_NAN(f[k]) ||
 141                    f[k] >= 1.0e20 || f[k] <= -1.0e10) {
 142                   _mesa_printf("Bad array data:\n");
 143                   _mesa_printf("  Element[%u].%u = %f\n", j, k, f[k]);
 144                   _mesa_printf("  Array %u at %p\n", attrib, (void* ) array);
 145                   _mesa_printf("  Type 0x%x, Size %d, Stride %d\n",
 146                                array->Type, array->Size, array->Stride);
 147                   _mesa_printf("  Address/offset %p in Buffer Object %u\n",
 148                                array->Ptr, array->BufferObj->Name);
 149                   f[k] = 1.0; /* XXX replace the bad value! */
 150                }
 151                //assert(!IS_INF_OR_NAN(f[k]));
 152             }
 153          }
 154          break;
 155       default:
 156          ;
 157       }
 158    }
 159 }
 160
 161
 162 /**
 163  * Unmap the buffer object referenced by given array, if mapped.
 164  */
 165 static void
 166 unmap_array_buffer(GLcontext *ctx, struct gl_client_array *array)
 167 {
 168    if (array->Enabled &&
 169        _mesa_is_bufferobj(array->BufferObj) &&
 170        _mesa_bufferobj_mapped(array->BufferObj)) {
 171       ctx->Driver.UnmapBuffer(ctx,
 172                               GL_ARRAY_BUFFER_ARB,
 173                               array->BufferObj);
 174    }
 175 }
 176
 177
 178 /**
 179  * Examine the array's data for NaNs, etc.
 180  */
 181 static void
 182 check_draw_elements_data(GLcontext *ctx, GLsizei count, GLenum elemType,
 183                          const void *elements)
 184 {
 185    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
 186    const void *elemMap;
 187    GLint i, k;
 188
 189    if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {
 190       elemMap = ctx->Driver.MapBuffer(ctx,
 191                                       GL_ELEMENT_ARRAY_BUFFER_ARB,
 192                                       GL_READ_ONLY,
 193                                       ctx->Array.ElementArrayBufferObj);
 194       elements = ADD_POINTERS(elements, elemMap);
 195    }
 196
 197    for (i = 0; i < count; i++) {
 198       GLuint j;
 199
 200       /* j = element[i] */
 201       switch (elemType) {
 202       case GL_UNSIGNED_BYTE:
 203          j = ((const GLubyte *) elements)[i];
 204          break;
 205       case GL_UNSIGNED_SHORT:
 206          j = ((const GLushort *) elements)[i];
 207          break;
 208       case GL_UNSIGNED_INT:
 209          j = ((const GLuint *) elements)[i];
 210          break;
 211       default:
 212          assert(0);
 213       }
 214
 215       /* check element j of each enabled array */
 216       check_array_data(ctx, &arrayObj->Vertex, VERT_ATTRIB_POS, j);
 217       check_array_data(ctx, &arrayObj->Normal, VERT_ATTRIB_NORMAL, j);
 218       check_array_data(ctx, &arrayObj->Color, VERT_ATTRIB_COLOR0, j);
 219       check_array_data(ctx, &arrayObj->SecondaryColor, VERT_ATTRIB_COLOR1, j);
 220       for (k = 0; k < Elements(arrayObj->TexCoord); k++) {
 221          check_array_data(ctx, &arrayObj->TexCoord[k], VERT_ATTRIB_TEX0 + k, j);
 222       }
 223       for (k = 0; k < Elements(arrayObj->VertexAttrib); k++) {
 224          check_array_data(ctx, &arrayObj->VertexAttrib[k], VERT_ATTRIB_GENERIC0 + k, j);
 225       }
 226    }
 227
 228    if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {
 229       ctx->Driver.UnmapBuffer(ctx,
 230                               GL_ELEMENT_ARRAY_BUFFER_ARB,
 231                               ctx->Array.ElementArrayBufferObj);
 232    }
 233
 234    unmap_array_buffer(ctx, &arrayObj->Vertex);
 235    unmap_array_buffer(ctx, &arrayObj->Normal);
 236    unmap_array_buffer(ctx, &arrayObj->Color);
 237    for (k = 0; k < Elements(arrayObj->TexCoord); k++) {
 238       unmap_array_buffer(ctx, &arrayObj->TexCoord[k]);
 239    }
 240    for (k = 0; k < Elements(arrayObj->VertexAttrib); k++) {
 241       unmap_array_buffer(ctx, &arrayObj->VertexAttrib[k]);
 242    }
 243 }
 244
 245
 246 /**
 247  * Check array data, looking for NaNs, etc.
 248  */
 249 static void
 250 check_draw_arrays_data(GLcontext *ctx, GLint start, GLsizei count)
 251 {
 252    /* TO DO */
 253 }
 254
 255
 256 /**
 257  * Print info/data for glDrawArrays().
 258  */
 259 static void
 260 print_draw_arrays(GLcontext *ctx, struct vbo_exec_context *exec,
 261                   GLenum mode, GLint start, GLsizei count)
 262 {
 263    int i;
 264
 265    _mesa_printf("vbo_exec_DrawArrays(mode 0x%x, start %d, count %d):\n",
 266                 mode, start, count);
 267
 268    for (i = 0; i < 32; i++) {
 269       GLuint bufName = exec->array.inputs[i]->BufferObj->Name;
 270       GLint stride = exec->array.inputs[i]->Stride;
 271       _mesa_printf("attr %2d: size %d stride %d  enabled %d  "
 272                    "ptr %p  Bufobj %u\n",
 273                    i,
 274                    exec->array.inputs[i]->Size,
 275                    stride,
 276                    /*exec->array.inputs[i]->Enabled,*/
 277                    exec->array.legacy_array[i]->Enabled,
 278                    exec->array.inputs[i]->Ptr,
 279                    bufName);
 280
 281       if (bufName) {
 282          struct gl_buffer_object *buf = _mesa_lookup_bufferobj(ctx, bufName);
 283          GLubyte *p = ctx->Driver.MapBuffer(ctx, GL_ARRAY_BUFFER_ARB,
 284                                             GL_READ_ONLY_ARB, buf);
 285          int offset = (int) (GLintptr) exec->array.inputs[i]->Ptr;
 286          float *f = (float *) (p + offset);
 287          int *k = (int *) f;
 288          int i;
 289          int n = (count * stride) / 4;
 290          if (n > 32)
 291             n = 32;
 292          _mesa_printf("  Data at offset %d:\n", offset);
 293          for (i = 0; i < n; i++) {
 294             _mesa_printf("    float[%d] = 0x%08x %f\n", i, k[i], f[i]);
 295          }
 296          ctx->Driver.UnmapBuffer(ctx, GL_ARRAY_BUFFER_ARB, buf);
 297       }
 298    }
 299 }
 300
 301
 302 /**
 303  * Just translate the arrayobj into a sane layout.
 304  */
 305 static void
 306 bind_array_obj(GLcontext *ctx)
 307 {
 308    struct vbo_context *vbo = vbo_context(ctx);
 309    struct vbo_exec_context *exec = &vbo->exec;
 310    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
 311    GLuint i;
 312
 313    /* TODO: Fix the ArrayObj struct to keep legacy arrays in an array
 314     * rather than as individual named arrays.  Then this function can
 315     * go away.
 316     */
 317    exec->array.legacy_array[VERT_ATTRIB_POS] = &arrayObj->Vertex;
 318    exec->array.legacy_array[VERT_ATTRIB_WEIGHT] = &arrayObj->Weight;
 319    exec->array.legacy_array[VERT_ATTRIB_NORMAL] = &arrayObj->Normal;
 320    exec->array.legacy_array[VERT_ATTRIB_COLOR0] = &arrayObj->Color;
 321    exec->array.legacy_array[VERT_ATTRIB_COLOR1] = &arrayObj->SecondaryColor;
 322    exec->array.legacy_array[VERT_ATTRIB_FOG] = &arrayObj->FogCoord;
 323    exec->array.legacy_array[VERT_ATTRIB_COLOR_INDEX] = &arrayObj->Index;
 324    if (arrayObj->PointSize.Enabled) {
 325       /* this aliases COLOR_INDEX */
 326       exec->array.legacy_array[VERT_ATTRIB_POINT_SIZE] = &arrayObj->PointSize;
 327    }
 328    exec->array.legacy_array[VERT_ATTRIB_EDGEFLAG] = &arrayObj->EdgeFlag;
 329
 330    for (i = 0; i < Elements(arrayObj->TexCoord); i++)
 331       exec->array.legacy_array[VERT_ATTRIB_TEX0 + i] = &arrayObj->TexCoord[i];
 332
 333    for (i = 0; i < Elements(arrayObj->VertexAttrib); i++) {
 334       assert(i < Elements(exec->array.generic_array));
 335       exec->array.generic_array[i] = &arrayObj->VertexAttrib[i];
 336    }
 337
 338    exec->array.array_obj = arrayObj->Name;
 339 }
 340
 341
 342 static void
 343 recalculate_input_bindings(GLcontext *ctx)
 344 {
 345    struct vbo_context *vbo = vbo_context(ctx);
 346    struct vbo_exec_context *exec = &vbo->exec;
 347    const struct gl_client_array **inputs = &exec->array.inputs[0];
 348    GLbitfield const_inputs = 0x0;
 349    GLuint i;
 350
 351    exec->array.program_mode = get_program_mode(ctx);
 352    exec->array.enabled_flags = ctx->Array.ArrayObj->_Enabled;
 353
 354    switch (exec->array.program_mode) {
 355    case VP_NONE:
 356       /* When no vertex program is active (or the vertex program is generated
 357        * from fixed-function state).  We put the material values into the
 358        * generic slots.  This is the only situation where material values
 359        * are available as per-vertex attributes.
 360        */
 361       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 362          if (exec->array.legacy_array[i]->Enabled)
 363             inputs[i] = exec->array.legacy_array[i];
 364          else {
 365             inputs[i] = &vbo->legacy_currval[i];
 366             const_inputs |= 1 << i;
 367          }
 368       }
 369
 370       for (i = 0; i < MAT_ATTRIB_MAX; i++) {
 371          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->mat_currval[i];
 372          const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 373       }
 374
 375       /* Could use just about anything, just to fill in the empty
 376        * slots:
 377        */
 378       for (i = MAT_ATTRIB_MAX; i < VERT_ATTRIB_MAX - VERT_ATTRIB_GENERIC0; i++) {
 379          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 380          const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 381       }
 382       break;
 383
 384    case VP_NV:
 385       /* NV_vertex_program - attribute arrays alias and override
 386        * conventional, legacy arrays.  No materials, and the generic
 387        * slots are vacant.
 388        */
 389       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 390          if (exec->array.generic_array[i]->Enabled)
 391             inputs[i] = exec->array.generic_array[i];
 392          else if (exec->array.legacy_array[i]->Enabled)
 393             inputs[i] = exec->array.legacy_array[i];
 394          else {
 395             inputs[i] = &vbo->legacy_currval[i];
 396             const_inputs |= 1 << i;
 397          }
 398       }
 399
 400       /* Could use just about anything, just to fill in the empty
 401        * slots:
 402        */
 403       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 404          inputs[i] = &vbo->generic_currval[i - VERT_ATTRIB_GENERIC0];
 405          const_inputs |= 1 << i;
 406       }
 407       break;
 408
 409    case VP_ARB:
 410       /* GL_ARB_vertex_program or GLSL vertex shader - Only the generic[0]
 411        * attribute array aliases and overrides the legacy position array.
 412        *
 413        * Otherwise, legacy attributes available in the legacy slots,
 414        * generic attributes in the generic slots and materials are not
 415        * available as per-vertex attributes.
 416        */
 417       if (exec->array.generic_array[0]->Enabled)
 418          inputs[0] = exec->array.generic_array[0];
 419       else if (exec->array.legacy_array[0]->Enabled)
 420          inputs[0] = exec->array.legacy_array[0];
 421       else {
 422          inputs[0] = &vbo->legacy_currval[0];
 423          const_inputs |= 1 << 0;
 424       }
 425
 426       for (i = 1; i <= VERT_ATTRIB_TEX7; i++) {
 427          if (exec->array.legacy_array[i]->Enabled)
 428             inputs[i] = exec->array.legacy_array[i];
 429          else {
 430             inputs[i] = &vbo->legacy_currval[i];
 431             const_inputs |= 1 << i;
 432          }
 433       }
 434
 435       for (i = 0; i < MAX_VERTEX_GENERIC_ATTRIBS; i++) {
 436          if (exec->array.generic_array[i]->Enabled)
 437             inputs[VERT_ATTRIB_GENERIC0 + i] = exec->array.generic_array[i];
 438          else {
 439             inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 440             const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 441          }
 442
 443       }
 444       break;
 445    }
 446
 447    _mesa_set_varying_vp_inputs( ctx, ~const_inputs );
 448 }
 449
 450
 451 static void
 452 bind_arrays(GLcontext *ctx)
 453 {
 454 #if 0
 455    if (ctx->Array.ArrayObj.Name != exec->array.array_obj) {
 456       bind_array_obj(ctx);
 457       recalculate_input_bindings(ctx);
 458    }
 459    else if (exec->array.program_mode != get_program_mode(ctx) ||
 460             exec->array.enabled_flags != ctx->Array.ArrayObj->_Enabled) {
 461
 462       recalculate_input_bindings(ctx);
 463    }
 464 #else
 465    bind_array_obj(ctx);
 466    recalculate_input_bindings(ctx);
 467 #endif
 468 }
 469
 470
 471
 472 /***********************************************************************
 473  * API functions.
 474  */
 475
 476 static void GLAPIENTRY
 477 vbo_exec_DrawArrays(GLenum mode, GLint start, GLsizei count)
 478 {
 479    GET_CURRENT_CONTEXT(ctx);
 480    struct vbo_context *vbo = vbo_context(ctx);
 481    struct vbo_exec_context *exec = &vbo->exec;
 482    struct _mesa_prim prim[1];
 483
 484    if (!_mesa_validate_DrawArrays( ctx, mode, start, count ))
 485       return;
 486
 487    FLUSH_CURRENT( ctx, 0 );
 488
 489    if (ctx->NewState)
 490       _mesa_update_state( ctx );
 491
 492    if (!_mesa_valid_to_render(ctx, "glDrawArrays")) {
 493       return;
 494    }
 495
 496 #if 0
 497    check_draw_arrays_data(ctx, start, count);
 498 #else
 499    (void) check_draw_arrays_data;
 500 #endif
 501
 502    bind_arrays( ctx );
 503
 504    /* Again... because we may have changed the bitmask of per-vertex varying
 505     * attributes.  If we regenerate the fixed-function vertex program now
 506     * we may be able to prune down the number of vertex attributes which we
 507     * need in the shader.
 508     */
 509    if (ctx->NewState)
 510       _mesa_update_state( ctx );
 511
 512    prim[0].begin = 1;
 513    prim[0].end = 1;
 514    prim[0].weak = 0;
 515    prim[0].pad = 0;
 516    prim[0].mode = mode;
 517    prim[0].start = start;
 518    prim[0].count = count;
 519    prim[0].indexed = 0;
 520
 521    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, NULL,
 522                     GL_TRUE, start, start + count - 1 );
 523
 524 #if 0
 525    print_draw_arrays(ctx, exec, mode, start, count);
 526 #else
 527    (void) print_draw_arrays;
 528 #endif
 529 }
 530
 531
 532 /**
 533  * Map GL_ELEMENT_ARRAY_BUFFER and print contents.
 534  */
 535 static void
 536 dump_element_buffer(GLcontext *ctx, GLenum type)
 537 {
 538    const GLvoid *map = ctx->Driver.MapBuffer(ctx,
 539                                              GL_ELEMENT_ARRAY_BUFFER_ARB,
 540                                              GL_READ_ONLY,
 541                                              ctx->Array.ElementArrayBufferObj);
 542    switch (type) {
 543    case GL_UNSIGNED_BYTE:
 544       {
 545          const GLubyte *us = (const GLubyte *) map;
 546          GLuint i;
 547          for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size; i++) {
 548             _mesa_printf("%02x ", us[i]);
 549             if (i % 32 == 31)
 550                _mesa_printf("\n");
 551          }
 552          _mesa_printf("\n");
 553       }
 554       break;
 555    case GL_UNSIGNED_SHORT:
 556       {
 557          const GLushort *us = (const GLushort *) map;
 558          GLuint i;
 559          for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size / 2; i++) {
 560             _mesa_printf("%04x ", us[i]);
 561             if (i % 16 == 15)
 562                _mesa_printf("\n");
 563          }
 564          _mesa_printf("\n");
 565       }
 566       break;
 567    case GL_UNSIGNED_INT:
 568       {
 569          const GLuint *us = (const GLuint *) map;
 570          GLuint i;
 571          for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size / 4; i++) {
 572             _mesa_printf("%08x ", us[i]);
 573             if (i % 8 == 7)
 574                _mesa_printf("\n");
 575          }
 576          _mesa_printf("\n");
 577       }
 578       break;
 579    default:
 580       ;
 581    }
 582
 583    ctx->Driver.UnmapBuffer(ctx,
 584                            GL_ELEMENT_ARRAY_BUFFER_ARB,
 585                            ctx->Array.ElementArrayBufferObj);
 586 }
 587
 588 /* Inner support for both _mesa_DrawElements and _mesa_DrawRangeElements */
 589 static void
 590 vbo_validated_drawrangeelements(GLcontext *ctx, GLenum mode,
 591                                 GLboolean index_bounds_valid,
 592                                 GLuint start, GLuint end,
 593                                 GLsizei count, GLenum type,
 594                                 const GLvoid *indices)
 595 {
 596    struct vbo_context *vbo = vbo_context(ctx);
 597    struct vbo_exec_context *exec = &vbo->exec;
 598    struct _mesa_index_buffer ib;
 599    struct _mesa_prim prim[1];
 600
 601    FLUSH_CURRENT( ctx, 0 );
 602
 603    if (ctx->NewState)
 604       _mesa_update_state( ctx );
 605
 606    if (!_mesa_valid_to_render(ctx, "glDraw[Range]Elements")) {
 607       return;
 608    }
 609
 610    if (ctx->NewState)
 611       _mesa_update_state( ctx );
 612
 613    bind_arrays( ctx );
 614
 615    ib.count = count;
 616    ib.type = type;
 617    ib.obj = ctx->Array.ElementArrayBufferObj;
 618    ib.ptr = indices;
 619
 620    prim[0].begin = 1;
 621    prim[0].end = 1;
 622    prim[0].weak = 0;
 623    prim[0].pad = 0;
 624    prim[0].mode = mode;
 625    prim[0].start = 0;
 626    prim[0].count = count;
 627    prim[0].indexed = 1;
 628
 629    /* Need to give special consideration to rendering a range of
 630     * indices starting somewhere above zero.  Typically the
 631     * application is issuing multiple DrawRangeElements() to draw
 632     * successive primitives layed out linearly in the vertex arrays.
 633     * Unless the vertex arrays are all in a VBO (or locked as with
 634     * CVA), the OpenGL semantics imply that we need to re-read or
 635     * re-upload the vertex data on each draw call.
 636     *
 637     * In the case of hardware tnl, we want to avoid starting the
 638     * upload at zero, as it will mean every draw call uploads an
 639     * increasing amount of not-used vertex data.  Worse - in the
 640     * software tnl module, all those vertices might be transformed and
 641     * lit but never rendered.
 642     *
 643     * If we just upload or transform the vertices in start..end,
 644     * however, the indices will be incorrect.
 645     *
 646     * At this level, we don't know exactly what the requirements of
 647     * the backend are going to be, though it will likely boil down to
 648     * either:
 649     *
 650     * 1) Do nothing, everything is in a VBO and is processed once
 651     *       only.
 652     *
 653     * 2) Adjust the indices and vertex arrays so that start becomes
 654     *    zero.
 655     *
 656     * Rather than doing anything here, I'll provide a helper function
 657     * for the latter case elsewhere.
 658     */
 659
 660    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, &ib,
 661                     index_bounds_valid, start, end );
 662 }
 663
 664 static void GLAPIENTRY
 665 vbo_exec_DrawRangeElements(GLenum mode,
 666                            GLuint start, GLuint end,
 667                            GLsizei count, GLenum type, const GLvoid *indices)
 668 {
 669    GET_CURRENT_CONTEXT(ctx);
 670
 671    if (!_mesa_validate_DrawRangeElements( ctx, mode, start, end, count,
 672                                           type, indices ))
 673       return;
 674
 675    if (end >= ctx->Array.ArrayObj->_MaxElement) {
 676       /* the max element is out of bounds of one or more enabled arrays */
 677       _mesa_warning(ctx, "glDraw[Range]Elements(start %u, end %u, count %d, "
 678                     "type 0x%x, indices=%p)\n"
 679                     "\tindex=%u is out of bounds (max=%u)  "
 680                     "Element Buffer %u (size %d)",
 681                     start, end, count, type, indices, end,
 682                     ctx->Array.ArrayObj->_MaxElement - 1,
 683                     ctx->Array.ElementArrayBufferObj->Name,
 684                     ctx->Array.ElementArrayBufferObj->Size);
 685
 686       if (0)
 687          dump_element_buffer(ctx, type);
 688
 689       if (0)
 690          _mesa_print_arrays(ctx);
 691       return;
 692    }
 693    else if (0) {
 694       _mesa_printf("glDraw[Range]Elements"
 695                    "(start %u, end %u, type 0x%x, count %d) ElemBuf %u\n",
 696                    start, end, type, count,
 697                    ctx->Array.ElementArrayBufferObj->Name);
 698    }
 699
 700 #if 0
 701    check_draw_elements_data(ctx, count, type, indices);
 702 #else
 703    (void) check_draw_elements_data;
 704 #endif
 705
 706    vbo_validated_drawrangeelements(ctx, mode, GL_TRUE, start, end,
 707                                    count, type, indices);
 708 }
 709
 710
 711 static void GLAPIENTRY
 712 vbo_exec_DrawElements(GLenum mode, GLsizei count, GLenum type,
 713                       const GLvoid *indices)
 714 {
 715    GET_CURRENT_CONTEXT(ctx);
 716
 717    if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices ))
 718       return;
 719
 720    vbo_validated_drawrangeelements(ctx, mode, GL_FALSE, ~0, ~0,
 721                                    count, type, indices);
 722 }
 723
 724
 725 /***********************************************************************
 726  * Initialization
 727  */
 728
 729 void
 730 vbo_exec_array_init( struct vbo_exec_context *exec )
 731 {
 732 #if 1
 733    exec->vtxfmt.DrawArrays = vbo_exec_DrawArrays;
 734    exec->vtxfmt.DrawElements = vbo_exec_DrawElements;
 735    exec->vtxfmt.DrawRangeElements = vbo_exec_DrawRangeElements;
 736 #else
 737    exec->vtxfmt.DrawArrays = _mesa_noop_DrawArrays;
 738    exec->vtxfmt.DrawElements = _mesa_noop_DrawElements;
 739    exec->vtxfmt.DrawRangeElements = _mesa_noop_DrawRangeElements;
 740 #endif
 741 }
 742
 743
 744 void
 745 vbo_exec_array_destroy( struct vbo_exec_context *exec )
 746 {
 747    /* nothing to do */
 748 }
 749
 750
 751 /* This API entrypoint is not ordinarily used */
 752 void GLAPIENTRY
 753 _mesa_DrawArrays(GLenum mode, GLint first, GLsizei count)
 754 {
 755    vbo_exec_DrawArrays(mode, first, count);
 756 }
 757
 758
 759 /* This API entrypoint is not ordinarily used */
 760 void GLAPIENTRY
 761 _mesa_DrawElements(GLenum mode, GLsizei count, GLenum type,
 762                    const GLvoid *indices)
 763 {
 764    vbo_exec_DrawElements(mode, count, type, indices);
 765 }
 766
 767
 768 /* This API entrypoint is not ordinarily used */
 769 void GLAPIENTRY
 770 _mesa_DrawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count,
 771                         GLenum type, const GLvoid *indices)
 772 {
 773    vbo_exec_DrawRangeElements(mode, start, end, count, type, indices);
 774 }