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 "main/macros.h"
  37 #include "glapi/dispatch.h"
  38
  39 #include "vbo_context.h"
  40
  41
  42 /**
  43  * Compute min and max elements for glDraw[Range]Elements() calls.
  44  */
  45 void
  46 vbo_get_minmax_index(GLcontext *ctx,
  47                      const struct _mesa_prim *prim,
  48                      const struct _mesa_index_buffer *ib,
  49                      GLuint *min_index, GLuint *max_index)
  50 {
  51    GLuint i;
  52    GLsizei count = prim->count;
  53    const void *indices;
  54
  55    if (_mesa_is_bufferobj(ib->obj)) {
  56       const GLvoid *map = ctx->Driver.MapBuffer(ctx,
  57                                                 GL_ELEMENT_ARRAY_BUFFER_ARB,
  58                                                 GL_READ_ONLY,
  59                                                 ib->obj);
  60       indices = ADD_POINTERS(map, ib->ptr);
  61    } else {
  62       indices = ib->ptr;
  63    }
  64
  65    switch (ib->type) {
  66    case GL_UNSIGNED_INT: {
  67       const GLuint *ui_indices = (const GLuint *)indices;
  68       GLuint max_ui = ui_indices[count-1];
  69       GLuint min_ui = ui_indices[0];
  70       for (i = 0; i < count; i++) {
  71          if (ui_indices[i] > max_ui) max_ui = ui_indices[i];
  72          if (ui_indices[i] < min_ui) min_ui = ui_indices[i];
  73       }
  74       *min_index = min_ui;
  75       *max_index = max_ui;
  76       break;
  77    }
  78    case GL_UNSIGNED_SHORT: {
  79       const GLushort *us_indices = (const GLushort *)indices;
  80       GLuint max_us = us_indices[count-1];
  81       GLuint min_us = us_indices[0];
  82       for (i = 0; i < count; i++) {
  83          if (us_indices[i] > max_us) max_us = us_indices[i];
  84          if (us_indices[i] < min_us) min_us = us_indices[i];
  85       }
  86       *min_index = min_us;
  87       *max_index = max_us;
  88       break;
  89    }
  90    case GL_UNSIGNED_BYTE: {
  91       const GLubyte *ub_indices = (const GLubyte *)indices;
  92       GLuint max_ub = ub_indices[count-1];
  93       GLuint min_ub = ub_indices[0];
  94       for (i = 0; i < count; i++) {
  95          if (ub_indices[i] > max_ub) max_ub = ub_indices[i];
  96          if (ub_indices[i] < min_ub) min_ub = ub_indices[i];
  97       }
  98       *min_index = min_ub;
  99       *max_index = max_ub;
 100       break;
 101    }
 102    default:
 103       assert(0);
 104       break;
 105    }
 106
 107    if (_mesa_is_bufferobj(ib->obj)) {
 108       ctx->Driver.UnmapBuffer(ctx,
 109                               GL_ELEMENT_ARRAY_BUFFER_ARB,
 110                               ib->obj);
 111    }
 112 }
 113
 114
 115 /**
 116  * Check that element 'j' of the array has reasonable data.
 117  * Map VBO if needed.
 118  */
 119 static void
 120 check_array_data(GLcontext *ctx, struct gl_client_array *array,
 121                  GLuint attrib, GLuint j)
 122 {
 123    if (array->Enabled) {
 124       const void *data = array->Ptr;
 125       if (_mesa_is_bufferobj(array->BufferObj)) {
 126          if (!array->BufferObj->Pointer) {
 127             /* need to map now */
 128             array->BufferObj->Pointer = ctx->Driver.MapBuffer(ctx,
 129                                                               GL_ARRAY_BUFFER_ARB,
 130                                                               GL_READ_ONLY,
 131                                                               array->BufferObj);
 132          }
 133          data = ADD_POINTERS(data, array->BufferObj->Pointer);
 134       }
 135       switch (array->Type) {
 136       case GL_FLOAT:
 137          {
 138             GLfloat *f = (GLfloat *) ((GLubyte *) data + array->StrideB * j);
 139             GLuint k;
 140             for (k = 0; k < array->Size; k++) {
 141                if (IS_INF_OR_NAN(f[k]) ||
 142                    f[k] >= 1.0e20 || f[k] <= -1.0e10) {
 143                   _mesa_printf("Bad array data:\n");
 144                   _mesa_printf("  Element[%u].%u = %f\n", j, k, f[k]);
 145                   _mesa_printf("  Array %u at %p\n", attrib, (void* ) array);
 146                   _mesa_printf("  Type 0x%x, Size %d, Stride %d\n",
 147                                array->Type, array->Size, array->Stride);
 148                   _mesa_printf("  Address/offset %p in Buffer Object %u\n",
 149                                array->Ptr, array->BufferObj->Name);
 150                   f[k] = 1.0; /* XXX replace the bad value! */
 151                }
 152                //assert(!IS_INF_OR_NAN(f[k]));
 153             }
 154          }
 155          break;
 156       default:
 157          ;
 158       }
 159    }
 160 }
 161
 162
 163 /**
 164  * Unmap the buffer object referenced by given array, if mapped.
 165  */
 166 static void
 167 unmap_array_buffer(GLcontext *ctx, struct gl_client_array *array)
 168 {
 169    if (array->Enabled &&
 170        _mesa_is_bufferobj(array->BufferObj) &&
 171        _mesa_bufferobj_mapped(array->BufferObj)) {
 172       ctx->Driver.UnmapBuffer(ctx,
 173                               GL_ARRAY_BUFFER_ARB,
 174                               array->BufferObj);
 175    }
 176 }
 177
 178
 179 /**
 180  * Examine the array's data for NaNs, etc.
 181  */
 182 static void
 183 check_draw_elements_data(GLcontext *ctx, GLsizei count, GLenum elemType,
 184                          const void *elements)
 185 {
 186    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
 187    const void *elemMap;
 188    GLint i, k;
 189
 190    if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {
 191       elemMap = ctx->Driver.MapBuffer(ctx,
 192                                       GL_ELEMENT_ARRAY_BUFFER_ARB,
 193                                       GL_READ_ONLY,
 194                                       ctx->Array.ElementArrayBufferObj);
 195       elements = ADD_POINTERS(elements, elemMap);
 196    }
 197
 198    for (i = 0; i < count; i++) {
 199       GLuint j;
 200
 201       /* j = element[i] */
 202       switch (elemType) {
 203       case GL_UNSIGNED_BYTE:
 204          j = ((const GLubyte *) elements)[i];
 205          break;
 206       case GL_UNSIGNED_SHORT:
 207          j = ((const GLushort *) elements)[i];
 208          break;
 209       case GL_UNSIGNED_INT:
 210          j = ((const GLuint *) elements)[i];
 211          break;
 212       default:
 213          assert(0);
 214       }
 215
 216       /* check element j of each enabled array */
 217       check_array_data(ctx, &arrayObj->Vertex, VERT_ATTRIB_POS, j);
 218       check_array_data(ctx, &arrayObj->Normal, VERT_ATTRIB_NORMAL, j);
 219       check_array_data(ctx, &arrayObj->Color, VERT_ATTRIB_COLOR0, j);
 220       check_array_data(ctx, &arrayObj->SecondaryColor, VERT_ATTRIB_COLOR1, j);
 221       for (k = 0; k < Elements(arrayObj->TexCoord); k++) {
 222          check_array_data(ctx, &arrayObj->TexCoord[k], VERT_ATTRIB_TEX0 + k, j);
 223       }
 224       for (k = 0; k < Elements(arrayObj->VertexAttrib); k++) {
 225          check_array_data(ctx, &arrayObj->VertexAttrib[k], VERT_ATTRIB_GENERIC0 + k, j);
 226       }
 227    }
 228
 229    if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {
 230       ctx->Driver.UnmapBuffer(ctx,
 231                               GL_ELEMENT_ARRAY_BUFFER_ARB,
 232                               ctx->Array.ElementArrayBufferObj);
 233    }
 234
 235    unmap_array_buffer(ctx, &arrayObj->Vertex);
 236    unmap_array_buffer(ctx, &arrayObj->Normal);
 237    unmap_array_buffer(ctx, &arrayObj->Color);
 238    for (k = 0; k < Elements(arrayObj->TexCoord); k++) {
 239       unmap_array_buffer(ctx, &arrayObj->TexCoord[k]);
 240    }
 241    for (k = 0; k < Elements(arrayObj->VertexAttrib); k++) {
 242       unmap_array_buffer(ctx, &arrayObj->VertexAttrib[k]);
 243    }
 244 }
 245
 246
 247 /**
 248  * Check array data, looking for NaNs, etc.
 249  */
 250 static void
 251 check_draw_arrays_data(GLcontext *ctx, GLint start, GLsizei count)
 252 {
 253    /* TO DO */
 254 }
 255
 256
 257 /**
 258  * Print info/data for glDrawArrays().
 259  */
 260 static void
 261 print_draw_arrays(GLcontext *ctx, struct vbo_exec_context *exec,
 262                   GLenum mode, GLint start, GLsizei count)
 263 {
 264    int i;
 265
 266    _mesa_printf("vbo_exec_DrawArrays(mode 0x%x, start %d, count %d):\n",
 267                 mode, start, count);
 268
 269    for (i = 0; i < 32; i++) {
 270       GLuint bufName = exec->array.inputs[i]->BufferObj->Name;
 271       GLint stride = exec->array.inputs[i]->Stride;
 272       _mesa_printf("attr %2d: size %d stride %d  enabled %d  "
 273                    "ptr %p  Bufobj %u\n",
 274                    i,
 275                    exec->array.inputs[i]->Size,
 276                    stride,
 277                    /*exec->array.inputs[i]->Enabled,*/
 278                    exec->array.legacy_array[i]->Enabled,
 279                    exec->array.inputs[i]->Ptr,
 280                    bufName);
 281
 282       if (bufName) {
 283          struct gl_buffer_object *buf = _mesa_lookup_bufferobj(ctx, bufName);
 284          GLubyte *p = ctx->Driver.MapBuffer(ctx, GL_ARRAY_BUFFER_ARB,
 285                                             GL_READ_ONLY_ARB, buf);
 286          int offset = (int) (GLintptr) exec->array.inputs[i]->Ptr;
 287          float *f = (float *) (p + offset);
 288          int *k = (int *) f;
 289          int i;
 290          int n = (count * stride) / 4;
 291          if (n > 32)
 292             n = 32;
 293          _mesa_printf("  Data at offset %d:\n", offset);
 294          for (i = 0; i < n; i++) {
 295             _mesa_printf("    float[%d] = 0x%08x %f\n", i, k[i], f[i]);
 296          }
 297          ctx->Driver.UnmapBuffer(ctx, GL_ARRAY_BUFFER_ARB, buf);
 298       }
 299    }
 300 }
 301
 302
 303 /**
 304  * Just translate the arrayobj into a sane layout.
 305  */
 306 static void
 307 bind_array_obj(GLcontext *ctx)
 308 {
 309    struct vbo_context *vbo = vbo_context(ctx);
 310    struct vbo_exec_context *exec = &vbo->exec;
 311    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
 312    GLuint i;
 313
 314    /* TODO: Fix the ArrayObj struct to keep legacy arrays in an array
 315     * rather than as individual named arrays.  Then this function can
 316     * go away.
 317     */
 318    exec->array.legacy_array[VERT_ATTRIB_POS] = &arrayObj->Vertex;
 319    exec->array.legacy_array[VERT_ATTRIB_WEIGHT] = &arrayObj->Weight;
 320    exec->array.legacy_array[VERT_ATTRIB_NORMAL] = &arrayObj->Normal;
 321    exec->array.legacy_array[VERT_ATTRIB_COLOR0] = &arrayObj->Color;
 322    exec->array.legacy_array[VERT_ATTRIB_COLOR1] = &arrayObj->SecondaryColor;
 323    exec->array.legacy_array[VERT_ATTRIB_FOG] = &arrayObj->FogCoord;
 324    exec->array.legacy_array[VERT_ATTRIB_COLOR_INDEX] = &arrayObj->Index;
 325    if (arrayObj->PointSize.Enabled) {
 326       /* this aliases COLOR_INDEX */
 327       exec->array.legacy_array[VERT_ATTRIB_POINT_SIZE] = &arrayObj->PointSize;
 328    }
 329    exec->array.legacy_array[VERT_ATTRIB_EDGEFLAG] = &arrayObj->EdgeFlag;
 330
 331    for (i = 0; i < Elements(arrayObj->TexCoord); i++)
 332       exec->array.legacy_array[VERT_ATTRIB_TEX0 + i] = &arrayObj->TexCoord[i];
 333
 334    for (i = 0; i < Elements(arrayObj->VertexAttrib); i++) {
 335       assert(i < Elements(exec->array.generic_array));
 336       exec->array.generic_array[i] = &arrayObj->VertexAttrib[i];
 337    }
 338
 339    exec->array.array_obj = arrayObj->Name;
 340 }
 341
 342
 343 static void
 344 recalculate_input_bindings(GLcontext *ctx)
 345 {
 346    struct vbo_context *vbo = vbo_context(ctx);
 347    struct vbo_exec_context *exec = &vbo->exec;
 348    const struct gl_client_array **inputs = &exec->array.inputs[0];
 349    GLbitfield const_inputs = 0x0;
 350    GLuint i;
 351
 352    exec->array.program_mode = get_program_mode(ctx);
 353    exec->array.enabled_flags = ctx->Array.ArrayObj->_Enabled;
 354
 355    switch (exec->array.program_mode) {
 356    case VP_NONE:
 357       /* When no vertex program is active (or the vertex program is generated
 358        * from fixed-function state).  We put the material values into the
 359        * generic slots.  This is the only situation where material values
 360        * are available as per-vertex attributes.
 361        */
 362       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 363          if (exec->array.legacy_array[i]->Enabled)
 364             inputs[i] = exec->array.legacy_array[i];
 365          else {
 366             inputs[i] = &vbo->legacy_currval[i];
 367             const_inputs |= 1 << i;
 368          }
 369       }
 370
 371       for (i = 0; i < MAT_ATTRIB_MAX; i++) {
 372          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->mat_currval[i];
 373          const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 374       }
 375
 376       /* Could use just about anything, just to fill in the empty
 377        * slots:
 378        */
 379       for (i = MAT_ATTRIB_MAX; i < VERT_ATTRIB_MAX - VERT_ATTRIB_GENERIC0; i++) {
 380          inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 381          const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 382       }
 383       break;
 384
 385    case VP_NV:
 386       /* NV_vertex_program - attribute arrays alias and override
 387        * conventional, legacy arrays.  No materials, and the generic
 388        * slots are vacant.
 389        */
 390       for (i = 0; i <= VERT_ATTRIB_TEX7; i++) {
 391          if (exec->array.generic_array[i]->Enabled)
 392             inputs[i] = exec->array.generic_array[i];
 393          else if (exec->array.legacy_array[i]->Enabled)
 394             inputs[i] = exec->array.legacy_array[i];
 395          else {
 396             inputs[i] = &vbo->legacy_currval[i];
 397             const_inputs |= 1 << i;
 398          }
 399       }
 400
 401       /* Could use just about anything, just to fill in the empty
 402        * slots:
 403        */
 404       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 405          inputs[i] = &vbo->generic_currval[i - VERT_ATTRIB_GENERIC0];
 406          const_inputs |= 1 << i;
 407       }
 408       break;
 409
 410    case VP_ARB:
 411       /* GL_ARB_vertex_program or GLSL vertex shader - Only the generic[0]
 412        * attribute array aliases and overrides the legacy position array.
 413        *
 414        * Otherwise, legacy attributes available in the legacy slots,
 415        * generic attributes in the generic slots and materials are not
 416        * available as per-vertex attributes.
 417        */
 418       if (exec->array.generic_array[0]->Enabled)
 419          inputs[0] = exec->array.generic_array[0];
 420       else if (exec->array.legacy_array[0]->Enabled)
 421          inputs[0] = exec->array.legacy_array[0];
 422       else {
 423          inputs[0] = &vbo->legacy_currval[0];
 424          const_inputs |= 1 << 0;
 425       }
 426
 427       for (i = 1; i <= VERT_ATTRIB_TEX7; i++) {
 428          if (exec->array.legacy_array[i]->Enabled)
 429             inputs[i] = exec->array.legacy_array[i];
 430          else {
 431             inputs[i] = &vbo->legacy_currval[i];
 432             const_inputs |= 1 << i;
 433          }
 434       }
 435
 436       for (i = 0; i < MAX_VERTEX_GENERIC_ATTRIBS; i++) {
 437          if (exec->array.generic_array[i]->Enabled)
 438             inputs[VERT_ATTRIB_GENERIC0 + i] = exec->array.generic_array[i];
 439          else {
 440             inputs[VERT_ATTRIB_GENERIC0 + i] = &vbo->generic_currval[i];
 441             const_inputs |= 1 << (VERT_ATTRIB_GENERIC0 + i);
 442          }
 443
 444       }
 445       break;
 446    }
 447
 448    _mesa_set_varying_vp_inputs( ctx, ~const_inputs );
 449 }
 450
 451
 452 static void
 453 bind_arrays(GLcontext *ctx)
 454 {
 455 #if 0
 456    if (ctx->Array.ArrayObj.Name != exec->array.array_obj) {
 457       bind_array_obj(ctx);
 458       recalculate_input_bindings(ctx);
 459    }
 460    else if (exec->array.program_mode != get_program_mode(ctx) ||
 461             exec->array.enabled_flags != ctx->Array.ArrayObj->_Enabled) {
 462
 463       recalculate_input_bindings(ctx);
 464    }
 465 #else
 466    bind_array_obj(ctx);
 467    recalculate_input_bindings(ctx);
 468 #endif
 469 }
 470
 471
 472
 473 /***********************************************************************
 474  * API functions.
 475  */
 476
 477 static void GLAPIENTRY
 478 vbo_exec_DrawArrays(GLenum mode, GLint start, GLsizei count)
 479 {
 480    GET_CURRENT_CONTEXT(ctx);
 481    struct vbo_context *vbo = vbo_context(ctx);
 482    struct vbo_exec_context *exec = &vbo->exec;
 483    struct _mesa_prim prim[1];
 484
 485    if (!_mesa_validate_DrawArrays( ctx, mode, start, count ))
 486       return;
 487
 488    FLUSH_CURRENT( ctx, 0 );
 489
 490    if (ctx->NewState)
 491       _mesa_update_state( ctx );
 492
 493    if (!_mesa_valid_to_render(ctx, "glDrawArrays")) {
 494       return;
 495    }
 496
 497 #if 0
 498    check_draw_arrays_data(ctx, start, count);
 499 #else
 500    (void) check_draw_arrays_data;
 501 #endif
 502
 503    bind_arrays( ctx );
 504
 505    /* Again... because we may have changed the bitmask of per-vertex varying
 506     * attributes.  If we regenerate the fixed-function vertex program now
 507     * we may be able to prune down the number of vertex attributes which we
 508     * need in the shader.
 509     */
 510    if (ctx->NewState)
 511       _mesa_update_state( ctx );
 512
 513    prim[0].begin = 1;
 514    prim[0].end = 1;
 515    prim[0].weak = 0;
 516    prim[0].pad = 0;
 517    prim[0].mode = mode;
 518    prim[0].start = start;
 519    prim[0].count = count;
 520    prim[0].indexed = 0;
 521
 522    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, NULL,
 523                     GL_TRUE, start, start + count - 1 );
 524
 525 #if 0
 526    print_draw_arrays(ctx, exec, mode, start, count);
 527 #else
 528    (void) print_draw_arrays;
 529 #endif
 530 }
 531
 532
 533 /**
 534  * Map GL_ELEMENT_ARRAY_BUFFER and print contents.
 535  */
 536 static void
 537 dump_element_buffer(GLcontext *ctx, GLenum type)
 538 {
 539    const GLvoid *map = ctx->Driver.MapBuffer(ctx,
 540                                              GL_ELEMENT_ARRAY_BUFFER_ARB,
 541                                              GL_READ_ONLY,
 542                                              ctx->Array.ElementArrayBufferObj);
 543    switch (type) {
 544    case GL_UNSIGNED_BYTE:
 545       {
 546          const GLubyte *us = (const GLubyte *) map;
 547          GLuint i;
 548          for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size; i++) {
 549             _mesa_printf("%02x ", us[i]);
 550             if (i % 32 == 31)
 551                _mesa_printf("\n");
 552          }
 553          _mesa_printf("\n");
 554       }
 555       break;
 556    case GL_UNSIGNED_SHORT:
 557       {
 558          const GLushort *us = (const GLushort *) map;
 559          GLuint i;
 560          for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size / 2; i++) {
 561             _mesa_printf("%04x ", us[i]);
 562             if (i % 16 == 15)
 563                _mesa_printf("\n");
 564          }
 565          _mesa_printf("\n");
 566       }
 567       break;
 568    case GL_UNSIGNED_INT:
 569       {
 570          const GLuint *us = (const GLuint *) map;
 571          GLuint i;
 572          for (i = 0; i < ctx->Array.ElementArrayBufferObj->Size / 4; i++) {
 573             _mesa_printf("%08x ", us[i]);
 574             if (i % 8 == 7)
 575                _mesa_printf("\n");
 576          }
 577          _mesa_printf("\n");
 578       }
 579       break;
 580    default:
 581       ;
 582    }
 583
 584    ctx->Driver.UnmapBuffer(ctx,
 585                            GL_ELEMENT_ARRAY_BUFFER_ARB,
 586                            ctx->Array.ElementArrayBufferObj);
 587 }
 588
 589 /* Inner support for both _mesa_DrawElements and _mesa_DrawRangeElements */
 590 static void
 591 vbo_validated_drawrangeelements(GLcontext *ctx, GLenum mode,
 592                                 GLboolean index_bounds_valid,
 593                                 GLuint start, GLuint end,
 594                                 GLsizei count, GLenum type,
 595                                 const GLvoid *indices)
 596 {
 597    struct vbo_context *vbo = vbo_context(ctx);
 598    struct vbo_exec_context *exec = &vbo->exec;
 599    struct _mesa_index_buffer ib;
 600    struct _mesa_prim prim[1];
 601
 602    FLUSH_CURRENT( ctx, 0 );
 603
 604    if (ctx->NewState)
 605       _mesa_update_state( ctx );
 606
 607    if (!_mesa_valid_to_render(ctx, "glDraw[Range]Elements")) {
 608       return;
 609    }
 610
 611    if (ctx->NewState)
 612       _mesa_update_state( ctx );
 613
 614    bind_arrays( ctx );
 615
 616    ib.count = count;
 617    ib.type = type;
 618    ib.obj = ctx->Array.ElementArrayBufferObj;
 619    ib.ptr = indices;
 620
 621    prim[0].begin = 1;
 622    prim[0].end = 1;
 623    prim[0].weak = 0;
 624    prim[0].pad = 0;
 625    prim[0].mode = mode;
 626    prim[0].start = 0;
 627    prim[0].count = count;
 628    prim[0].indexed = 1;
 629
 630    /* Need to give special consideration to rendering a range of
 631     * indices starting somewhere above zero.  Typically the
 632     * application is issuing multiple DrawRangeElements() to draw
 633     * successive primitives layed out linearly in the vertex arrays.
 634     * Unless the vertex arrays are all in a VBO (or locked as with
 635     * CVA), the OpenGL semantics imply that we need to re-read or
 636     * re-upload the vertex data on each draw call.
 637     *
 638     * In the case of hardware tnl, we want to avoid starting the
 639     * upload at zero, as it will mean every draw call uploads an
 640     * increasing amount of not-used vertex data.  Worse - in the
 641     * software tnl module, all those vertices might be transformed and
 642     * lit but never rendered.
 643     *
 644     * If we just upload or transform the vertices in start..end,
 645     * however, the indices will be incorrect.
 646     *
 647     * At this level, we don't know exactly what the requirements of
 648     * the backend are going to be, though it will likely boil down to
 649     * either:
 650     *
 651     * 1) Do nothing, everything is in a VBO and is processed once
 652     *       only.
 653     *
 654     * 2) Adjust the indices and vertex arrays so that start becomes
 655     *    zero.
 656     *
 657     * Rather than doing anything here, I'll provide a helper function
 658     * for the latter case elsewhere.
 659     */
 660
 661    vbo->draw_prims( ctx, exec->array.inputs, prim, 1, &ib,
 662                     index_bounds_valid, start, end );
 663 }
 664
 665 static void GLAPIENTRY
 666 vbo_exec_DrawRangeElements(GLenum mode,
 667                            GLuint start, GLuint end,
 668                            GLsizei count, GLenum type, const GLvoid *indices)
 669 {
 670    static GLuint warnCount = 0;
 671    GET_CURRENT_CONTEXT(ctx);
 672
 673    if (!_mesa_validate_DrawRangeElements( ctx, mode, start, end, count,
 674                                           type, indices ))
 675       return;
 676
 677    if (end >= ctx->Array.ArrayObj->_MaxElement) {
 678       /* the max element is out of bounds of one or more enabled arrays */
 679       warnCount++;
 680
 681       if (warnCount < 10) {
 682          _mesa_warning(ctx, "glDraw[Range]Elements(start %u, end %u, count %d, "
 683                        "type 0x%x, indices=%p)\n"
 684                        "\tend is out of bounds (max=%u)  "
 685                        "Element Buffer %u (size %d)\n"
 686                        "\tThis should probably be fixed in the application.",
 687                        start, end, count, type, indices,
 688                        ctx->Array.ArrayObj->_MaxElement - 1,
 689                        ctx->Array.ElementArrayBufferObj->Name,
 690                        ctx->Array.ElementArrayBufferObj->Size);
 691       }
 692
 693       if (0)
 694          dump_element_buffer(ctx, type);
 695
 696       if (0)
 697          _mesa_print_arrays(ctx);
 698
 699 #ifdef DEBUG
 700       /* 'end' was out of bounds, but now let's check the actual array
 701        * indexes to see if any of them are out of bounds.  If so, warn
 702        * and skip the draw to avoid potential segfault, etc.
 703        */
 704       {
 705          GLuint max = _mesa_max_buffer_index(ctx, count, type, indices,
 706                                              ctx->Array.ElementArrayBufferObj);
 707          if (max >= ctx->Array.ArrayObj->_MaxElement) {
 708             if (warnCount < 10) {
 709                _mesa_warning(ctx, "glDraw[Range]Elements(start %u, end %u, "
 710                              "count %d, type 0x%x, indices=%p)\n"
 711                              "\tindex=%u is out of bounds (max=%u)  "
 712                              "Element Buffer %u (size %d)\n"
 713                              "\tSkipping the glDrawRangeElements() call",
 714                              start, end, count, type, indices, max,
 715                              ctx->Array.ArrayObj->_MaxElement - 1,
 716                              ctx->Array.ElementArrayBufferObj->Name,
 717                              ctx->Array.ElementArrayBufferObj->Size);
 718             }
 719             return;
 720          }
 721          /* XXX we could also find the min index and compare to 'start'
 722           * to see if start is correct.  But it's more likely to get the
 723           * upper bound wrong.
 724           */
 725       }
 726 #endif
 727    }
 728    else if (0) {
 729       _mesa_printf("glDraw[Range]Elements"
 730                    "(start %u, end %u, type 0x%x, count %d) ElemBuf %u\n",
 731                    start, end, type, count,
 732                    ctx->Array.ElementArrayBufferObj->Name);
 733    }
 734
 735 #if 0
 736    check_draw_elements_data(ctx, count, type, indices);
 737 #else
 738    (void) check_draw_elements_data;
 739 #endif
 740
 741    vbo_validated_drawrangeelements(ctx, mode, GL_TRUE, start, end,
 742                                    count, type, indices);
 743 }
 744
 745
 746 static void GLAPIENTRY
 747 vbo_exec_DrawElements(GLenum mode, GLsizei count, GLenum type,
 748                       const GLvoid *indices)
 749 {
 750    GET_CURRENT_CONTEXT(ctx);
 751
 752    if (!_mesa_validate_DrawElements( ctx, mode, count, type, indices ))
 753       return;
 754
 755    vbo_validated_drawrangeelements(ctx, mode, GL_FALSE, ~0, ~0,
 756                                    count, type, indices);
 757 }
 758
 759 /* Inner support for both _mesa_DrawElements and _mesa_DrawRangeElements */
 760 static void
 761 vbo_validated_multidrawelements(GLcontext *ctx, GLenum mode,
 762                                 const GLsizei *count, GLenum type,
 763                                 const GLvoid **indices, GLsizei primcount)
 764 {
 765    struct vbo_context *vbo = vbo_context(ctx);
 766    struct vbo_exec_context *exec = &vbo->exec;
 767    struct _mesa_index_buffer ib;
 768    struct _mesa_prim *prim;
 769    unsigned int index_type_size = 0;
 770    uintptr_t min_index_ptr, max_index_ptr;
 771    GLboolean fallback = GL_FALSE;
 772    int i;
 773
 774    if (primcount == 0)
 775       return;
 776
 777    FLUSH_CURRENT( ctx, 0 );
 778
 779    if (ctx->NewState)
 780       _mesa_update_state( ctx );
 781
 782    if (!_mesa_valid_to_render(ctx, "glMultiDrawElements")) {
 783       return;
 784    }
 785
 786    if (ctx->NewState)
 787       _mesa_update_state( ctx );
 788
 789    prim = _mesa_calloc(primcount * sizeof(*prim));
 790    if (prim == NULL) {
 791       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glMultiDrawElements");
 792       return;
 793    }
 794
 795    /* Decide if we can do this all as one set of primitives sharing the
 796     * same index buffer, or if we have to reset the index pointer per primitive.
 797     */
 798    bind_arrays( ctx );
 799
 800    switch (type) {
 801    case GL_UNSIGNED_INT:
 802       index_type_size = 4;
 803       break;
 804    case GL_UNSIGNED_SHORT:
 805       index_type_size = 2;
 806       break;
 807    case GL_UNSIGNED_BYTE:
 808       index_type_size = 1;
 809       break;
 810    default:
 811       assert(0);
 812    }
 813
 814    min_index_ptr = (uintptr_t)indices[0];
 815    max_index_ptr = 0;
 816    for (i = 0; i < primcount; i++) {
 817       min_index_ptr = MIN2(min_index_ptr, (uintptr_t)indices[i]);
 818       max_index_ptr = MAX2(max_index_ptr, (uintptr_t)indices[i] +
 819                            index_type_size * count[i]);
 820    }
 821
 822    /* Check if we can handle this thing as a bunch of index offsets from the
 823     * same index pointer.  If we can't, then we have to fall back to doing
 824     * a draw_prims per primitive.
 825     */
 826    if (index_type_size != 1) {
 827       for (i = 0; i < primcount; i++) {
 828          if ((((uintptr_t)indices[i] - min_index_ptr) % index_type_size) != 0) {
 829             fallback = GL_TRUE;
 830             break;
 831          }
 832       }
 833    }
 834
 835    /* If the index buffer isn't in a VBO, then treating the application's
 836     * subranges of the index buffer as one large index buffer may lead to
 837     * us reading unmapped memory.
 838     */
 839    if (!_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj))
 840       fallback = GL_TRUE;
 841
 842    if (!fallback) {
 843       ib.count = (max_index_ptr - min_index_ptr) / index_type_size;
 844       ib.type = type;
 845       ib.obj = ctx->Array.ElementArrayBufferObj;
 846       ib.ptr = (void *)min_index_ptr;
 847
 848       for (i = 0; i < primcount; i++) {
 849          prim[i].begin = (i == 0);
 850          prim[i].end = (i == primcount - 1);
 851          prim[i].weak = 0;
 852          prim[i].pad = 0;
 853          prim[i].mode = mode;
 854          prim[i].start = ((uintptr_t)indices[i] - min_index_ptr) / index_type_size;
 855          prim[i].count = count[i];
 856          prim[i].indexed = 1;
 857       }
 858
 859       vbo->draw_prims(ctx, exec->array.inputs, prim, primcount, &ib,
 860                       GL_FALSE, ~0, ~0);
 861    } else {
 862       for (i = 0; i < primcount; i++) {
 863          ib.count = count[i];
 864          ib.type = type;
 865          ib.obj = ctx->Array.ElementArrayBufferObj;
 866          ib.ptr = indices[i];
 867
 868
 869          prim[0].begin = 1;
 870          prim[0].end = 1;
 871          prim[0].weak = 0;
 872          prim[0].pad = 0;
 873          prim[0].mode = mode;
 874          prim[0].start = 0;
 875          prim[0].count = count[i];
 876          prim[0].indexed = 1;
 877       }
 878
 879       vbo->draw_prims(ctx, exec->array.inputs, prim, 1, &ib,
 880                       GL_FALSE, ~0, ~0);
 881    }
 882    _mesa_free(prim);
 883 }
 884
 885 static void GLAPIENTRY
 886 vbo_exec_MultiDrawElements(GLenum mode,
 887                            const GLsizei *count, GLenum type,
 888                            const GLvoid **indices,
 889                            GLsizei primcount)
 890 {
 891    GET_CURRENT_CONTEXT(ctx);
 892    GLint i;
 893
 894    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 895
 896    for (i = 0; i < primcount; i++) {
 897       if (!_mesa_validate_DrawElements( ctx, mode, count[i], type, indices[i] ))
 898          return;
 899    }
 900
 901    vbo_validated_multidrawelements(ctx, mode, count, type, indices, primcount);
 902 }
 903
 904
 905
 906 /***********************************************************************
 907  * Initialization
 908  */
 909
 910 void
 911 vbo_exec_array_init( struct vbo_exec_context *exec )
 912 {
 913 #if 1
 914    exec->vtxfmt.DrawArrays = vbo_exec_DrawArrays;
 915    exec->vtxfmt.DrawElements = vbo_exec_DrawElements;
 916    exec->vtxfmt.DrawRangeElements = vbo_exec_DrawRangeElements;
 917    exec->vtxfmt.MultiDrawElementsEXT = vbo_exec_MultiDrawElements;
 918 #else
 919    exec->vtxfmt.DrawArrays = _mesa_noop_DrawArrays;
 920    exec->vtxfmt.DrawElements = _mesa_noop_DrawElements;
 921    exec->vtxfmt.DrawRangeElements = _mesa_noop_DrawRangeElements;
 922    exec->vtxfmt.MultiDrawElementsEXT = _mesa_noop_MultiDrawElements;
 923 #endif
 924 }
 925
 926
 927 void
 928 vbo_exec_array_destroy( struct vbo_exec_context *exec )
 929 {
 930    /* nothing to do */
 931 }
 932
 933
 934 /* This API entrypoint is not ordinarily used */
 935 void GLAPIENTRY
 936 _mesa_DrawArrays(GLenum mode, GLint first, GLsizei count)
 937 {
 938    vbo_exec_DrawArrays(mode, first, count);
 939 }
 940
 941
 942 /* This API entrypoint is not ordinarily used */
 943 void GLAPIENTRY
 944 _mesa_DrawElements(GLenum mode, GLsizei count, GLenum type,
 945                    const GLvoid *indices)
 946 {
 947    vbo_exec_DrawElements(mode, count, type, indices);
 948 }
 949
 950
 951 /* This API entrypoint is not ordinarily used */
 952 void GLAPIENTRY
 953 _mesa_DrawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count,
 954                         GLenum type, const GLvoid *indices)
 955 {
 956    vbo_exec_DrawRangeElements(mode, start, end, count, type, indices);
 957 }
 958
 959 /* GL_EXT_multi_draw_arrays */
 960 void GLAPIENTRY
 961 _mesa_MultiDrawElementsEXT(GLenum mode, const GLsizei *count, GLenum type,
 962                            const GLvoid **indices, GLsizei primcount)
 963 {
 964    vbo_exec_MultiDrawElements(mode, count, type, indices, primcount);
 965 }