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