src/mesa/main/arrayobj.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * (C) Copyright IBM Corporation 2006
   6  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  * OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 /**
  29  * \file arrayobj.c
  30  *
  31  * Implementation of Vertex Array Objects (VAOs), from OpenGL 3.1+,
  32  * the GL_ARB_vertex_array_object extension, or the older
  33  * GL_APPLE_vertex_array_object extension.
  34  *
  35  * \todo
  36  * The code in this file borrows a lot from bufferobj.c.  There's a certain
  37  * amount of cruft left over from that origin that may be unnecessary.
  38  *
  39  * \author Ian Romanick <idr@us.ibm.com>
  40  * \author Brian Paul
  41  */
  42
  43
  44 #include "glheader.h"
  45 #include "hash.h"
  46 #include "image.h"
  47 #include "imports.h"
  48 #include "context.h"
  49 #include "bufferobj.h"
  50 #include "arrayobj.h"
  51 #include "macros.h"
  52 #include "mtypes.h"
  53 #include "varray.h"
  54 #include "main/dispatch.h"
  55
  56
  57 /**
  58  * Look up the array object for the given ID.
  59  *
  60  * \returns
  61  * Either a pointer to the array object with the specified ID or \c NULL for
  62  * a non-existent ID.  The spec defines ID 0 as being technically
  63  * non-existent.
  64  */
  65
  66 struct gl_vertex_array_object *
  67 _mesa_lookup_vao(struct gl_context *ctx, GLuint id)
  68 {
  69    if (id == 0)
  70       return NULL;
  71    else
  72       return (struct gl_vertex_array_object *)
  73          _mesa_HashLookup(ctx->Array.Objects, id);
  74 }
  75
  76
  77 /**
  78  * Looks up the array object for the given ID.
  79  *
  80  * Unlike _mesa_lookup_vao, this function generates a GL_INVALID_OPERATION
  81  * error if the array object does not exist. It also returns the default
  82  * array object when ctx is a compatibility profile context and id is zero.
  83  */
  84 struct gl_vertex_array_object *
  85 _mesa_lookup_vao_err(struct gl_context *ctx, GLuint id, const char *caller)
  86 {
  87    /* The ARB_direct_state_access specification says:
  88     *
  89     *    "<vaobj> is [compatibility profile:
  90     *     zero, indicating the default vertex array object, or]
  91     *     the name of the vertex array object."
  92     */
  93    if (id == 0) {
  94       if (ctx->API == API_OPENGL_CORE) {
  95          _mesa_error(ctx, GL_INVALID_OPERATION,
  96                      "%s(zero is not valid vaobj name in a core profile "
  97                      "context)", caller);
  98          return NULL;
  99       }
 100
 101       return ctx->Array.DefaultVAO;
 102    } else {
 103       struct gl_vertex_array_object *vao;
 104
 105       if (ctx->Array.LastLookedUpVAO &&
 106           ctx->Array.LastLookedUpVAO->Name == id) {
 107          vao = ctx->Array.LastLookedUpVAO;
 108       } else {
 109          vao = (struct gl_vertex_array_object *)
 110             _mesa_HashLookup(ctx->Array.Objects, id);
 111
 112          /* The ARB_direct_state_access specification says:
 113           *
 114           *    "An INVALID_OPERATION error is generated if <vaobj> is not
 115           *     [compatibility profile: zero or] the name of an existing
 116           *     vertex array object."
 117           */
 118          if (!vao || !vao->EverBound) {
 119             _mesa_error(ctx, GL_INVALID_OPERATION,
 120                         "%s(non-existent vaobj=%u)", caller, id);
 121             return NULL;
 122          }
 123
 124          _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
 125       }
 126
 127       return vao;
 128    }
 129 }
 130
 131
 132 /**
 133  * For all the vertex binding points in the array object, unbind any pointers
 134  * to any buffer objects (VBOs).
 135  * This is done just prior to array object destruction.
 136  */
 137 static void
 138 unbind_array_object_vbos(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 139 {
 140    GLuint i;
 141
 142    for (i = 0; i < ARRAY_SIZE(obj->VertexBinding); i++)
 143       _mesa_reference_buffer_object(ctx, &obj->VertexBinding[i].BufferObj, NULL);
 144
 145    for (i = 0; i < ARRAY_SIZE(obj->_VertexAttrib); i++)
 146       _mesa_reference_buffer_object(ctx, &obj->_VertexAttrib[i].BufferObj, NULL);
 147 }
 148
 149
 150 /**
 151  * Allocate and initialize a new vertex array object.
 152  *
 153  * This function is intended to be called via
 154  * \c dd_function_table::NewArrayObject.
 155  */
 156 struct gl_vertex_array_object *
 157 _mesa_new_vao(struct gl_context *ctx, GLuint name)
 158 {
 159    struct gl_vertex_array_object *obj = CALLOC_STRUCT(gl_vertex_array_object);
 160    if (obj)
 161       _mesa_initialize_vao(ctx, obj, name);
 162    return obj;
 163 }
 164
 165
 166 /**
 167  * Delete an array object.
 168  *
 169  * This function is intended to be called via
 170  * \c dd_function_table::DeleteArrayObject.
 171  */
 172 void
 173 _mesa_delete_vao(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 174 {
 175    unbind_array_object_vbos(ctx, obj);
 176    _mesa_reference_buffer_object(ctx, &obj->IndexBufferObj, NULL);
 177    mtx_destroy(&obj->Mutex);
 178    free(obj->Label);
 179    free(obj);
 180 }
 181
 182
 183 /**
 184  * Set ptr to vao w/ reference counting.
 185  * Note: this should only be called from the _mesa_reference_vao()
 186  * inline function.
 187  */
 188 void
 189 _mesa_reference_vao_(struct gl_context *ctx,
 190                      struct gl_vertex_array_object **ptr,
 191                      struct gl_vertex_array_object *vao)
 192 {
 193    assert(*ptr != vao);
 194
 195    if (*ptr) {
 196       /* Unreference the old array object */
 197       GLboolean deleteFlag = GL_FALSE;
 198       struct gl_vertex_array_object *oldObj = *ptr;
 199
 200       mtx_lock(&oldObj->Mutex);
 201       assert(oldObj->RefCount > 0);
 202       oldObj->RefCount--;
 203 #if 0
 204       printf("ArrayObj %p %d DECR to %d\n",
 205              (void *) oldObj, oldObj->Name, oldObj->RefCount);
 206 #endif
 207       deleteFlag = (oldObj->RefCount == 0);
 208       mtx_unlock(&oldObj->Mutex);
 209
 210       if (deleteFlag) {
 211          assert(ctx->Driver.DeleteArrayObject);
 212          ctx->Driver.DeleteArrayObject(ctx, oldObj);
 213       }
 214
 215       *ptr = NULL;
 216    }
 217    assert(!*ptr);
 218
 219    if (vao) {
 220       /* reference new array object */
 221       mtx_lock(&vao->Mutex);
 222       if (vao->RefCount == 0) {
 223          /* this array's being deleted (look just above) */
 224          /* Not sure this can every really happen.  Warn if it does. */
 225          _mesa_problem(NULL, "referencing deleted array object");
 226          *ptr = NULL;
 227       }
 228       else {
 229          vao->RefCount++;
 230 #if 0
 231          printf("ArrayObj %p %d INCR to %d\n",
 232                 (void *) vao, vao->Name, vao->RefCount);
 233 #endif
 234          *ptr = vao;
 235       }
 236       mtx_unlock(&vao->Mutex);
 237    }
 238 }
 239
 240
 241
 242 static void
 243 init_array(struct gl_context *ctx,
 244            struct gl_vertex_array_object *obj, GLuint index, GLint size, GLint type)
 245 {
 246    struct gl_vertex_attrib_array *array = &obj->VertexAttrib[index];
 247    struct gl_vertex_buffer_binding *binding = &obj->VertexBinding[index];
 248
 249    array->Size = size;
 250    array->Type = type;
 251    array->Format = GL_RGBA; /* only significant for GL_EXT_vertex_array_bgra */
 252    array->Stride = 0;
 253    array->Ptr = NULL;
 254    array->RelativeOffset = 0;
 255    array->Enabled = GL_FALSE;
 256    array->Normalized = GL_FALSE;
 257    array->Integer = GL_FALSE;
 258    array->Doubles = GL_FALSE;
 259    array->_ElementSize = size * _mesa_sizeof_type(type);
 260    array->VertexBinding = index;
 261
 262    binding->Offset = 0;
 263    binding->Stride = array->_ElementSize;
 264    binding->BufferObj = NULL;
 265    binding->_BoundArrays = BITFIELD64_BIT(index);
 266
 267    /* Vertex array buffers */
 268    _mesa_reference_buffer_object(ctx, &binding->BufferObj,
 269                                  ctx->Shared->NullBufferObj);
 270 }
 271
 272
 273 /**
 274  * Initialize a gl_vertex_array_object's arrays.
 275  */
 276 void
 277 _mesa_initialize_vao(struct gl_context *ctx,
 278                      struct gl_vertex_array_object *obj,
 279                      GLuint name)
 280 {
 281    GLuint i;
 282
 283    obj->Name = name;
 284
 285    mtx_init(&obj->Mutex, mtx_plain);
 286    obj->RefCount = 1;
 287
 288    /* Init the individual arrays */
 289    for (i = 0; i < ARRAY_SIZE(obj->VertexAttrib); i++) {
 290       switch (i) {
 291       case VERT_ATTRIB_WEIGHT:
 292          init_array(ctx, obj, VERT_ATTRIB_WEIGHT, 1, GL_FLOAT);
 293          break;
 294       case VERT_ATTRIB_NORMAL:
 295          init_array(ctx, obj, VERT_ATTRIB_NORMAL, 3, GL_FLOAT);
 296          break;
 297       case VERT_ATTRIB_COLOR1:
 298          init_array(ctx, obj, VERT_ATTRIB_COLOR1, 3, GL_FLOAT);
 299          break;
 300       case VERT_ATTRIB_FOG:
 301          init_array(ctx, obj, VERT_ATTRIB_FOG, 1, GL_FLOAT);
 302          break;
 303       case VERT_ATTRIB_COLOR_INDEX:
 304          init_array(ctx, obj, VERT_ATTRIB_COLOR_INDEX, 1, GL_FLOAT);
 305          break;
 306       case VERT_ATTRIB_EDGEFLAG:
 307          init_array(ctx, obj, VERT_ATTRIB_EDGEFLAG, 1, GL_BOOL);
 308          break;
 309       case VERT_ATTRIB_POINT_SIZE:
 310          init_array(ctx, obj, VERT_ATTRIB_POINT_SIZE, 1, GL_FLOAT);
 311          break;
 312       default:
 313          init_array(ctx, obj, i, 4, GL_FLOAT);
 314          break;
 315       }
 316    }
 317
 318    _mesa_reference_buffer_object(ctx, &obj->IndexBufferObj,
 319                                  ctx->Shared->NullBufferObj);
 320 }
 321
 322
 323 /**
 324  * Add the given array object to the array object pool.
 325  */
 326 static void
 327 save_array_object( struct gl_context *ctx, struct gl_vertex_array_object *obj )
 328 {
 329    if (obj->Name > 0) {
 330       /* insert into hash table */
 331       _mesa_HashInsert(ctx->Array.Objects, obj->Name, obj);
 332    }
 333 }
 334
 335
 336 /**
 337  * Remove the given array object from the array object pool.
 338  * Do not deallocate the array object though.
 339  */
 340 static void
 341 remove_array_object( struct gl_context *ctx, struct gl_vertex_array_object *obj )
 342 {
 343    if (obj->Name > 0) {
 344       /* remove from hash table */
 345       _mesa_HashRemove(ctx->Array.Objects, obj->Name);
 346    }
 347 }
 348
 349
 350 /**
 351  * Updates the derived gl_client_arrays when a gl_vertex_attrib_array
 352  * or a gl_vertex_buffer_binding has changed.
 353  */
 354 void
 355 _mesa_update_vao_client_arrays(struct gl_context *ctx,
 356                                struct gl_vertex_array_object *vao)
 357 {
 358    GLbitfield64 arrays = vao->NewArrays;
 359
 360    while (arrays) {
 361       struct gl_client_array *client_array;
 362       struct gl_vertex_attrib_array *attrib_array;
 363       struct gl_vertex_buffer_binding *buffer_binding;
 364
 365       GLint attrib = ffsll(arrays) - 1;
 366       arrays ^= BITFIELD64_BIT(attrib);
 367
 368       attrib_array = &vao->VertexAttrib[attrib];
 369       buffer_binding = &vao->VertexBinding[attrib_array->VertexBinding];
 370       client_array = &vao->_VertexAttrib[attrib];
 371
 372       _mesa_update_client_array(ctx, client_array, attrib_array,
 373                                 buffer_binding);
 374    }
 375 }
 376
 377
 378 /**********************************************************************/
 379 /* API Functions                                                      */
 380 /**********************************************************************/
 381
 382
 383 /**
 384  * Helper for _mesa_BindVertexArray() and _mesa_BindVertexArrayAPPLE().
 385  * \param genRequired  specifies behavour when id was not generated with
 386  *                     glGenVertexArrays().
 387  */
 388 static void
 389 bind_vertex_array(struct gl_context *ctx, GLuint id, GLboolean genRequired)
 390 {
 391    struct gl_vertex_array_object * const oldObj = ctx->Array.VAO;
 392    struct gl_vertex_array_object *newObj = NULL;
 393
 394    assert(oldObj != NULL);
 395
 396    if ( oldObj->Name == id )
 397       return;   /* rebinding the same array object- no change */
 398
 399    /*
 400     * Get pointer to new array object (newObj)
 401     */
 402    if (id == 0) {
 403       /* The spec says there is no array object named 0, but we use
 404        * one internally because it simplifies things.
 405        */
 406       newObj = ctx->Array.DefaultVAO;
 407    }
 408    else {
 409       /* non-default array object */
 410       newObj = _mesa_lookup_vao(ctx, id);
 411       if (!newObj) {
 412          if (genRequired) {
 413             _mesa_error(ctx, GL_INVALID_OPERATION,
 414                         "glBindVertexArray(non-gen name)");
 415             return;
 416          }
 417
 418          /* For APPLE version, generate a new array object now */
 419          newObj = (*ctx->Driver.NewArrayObject)(ctx, id);
 420          if (!newObj) {
 421             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindVertexArrayAPPLE");
 422             return;
 423          }
 424
 425          save_array_object(ctx, newObj);
 426       }
 427
 428       if (!newObj->EverBound) {
 429          /* The "Interactions with APPLE_vertex_array_object" section of the
 430           * GL_ARB_vertex_array_object spec says:
 431           *
 432           *     "The first bind call, either BindVertexArray or
 433           *     BindVertexArrayAPPLE, determines the semantic of the object."
 434           */
 435          newObj->ARBsemantics = genRequired;
 436          newObj->EverBound = GL_TRUE;
 437       }
 438    }
 439
 440    if (ctx->Array.DrawMethod == DRAW_ARRAYS) {
 441       /* The _DrawArrays pointer is pointing at the VAO being unbound and
 442        * that VAO may be in the process of being deleted. If it's not going
 443        * to be deleted, this will have no effect, because the pointer needs
 444        * to be updated by the VBO module anyway.
 445        *
 446        * Before the VBO module can update the pointer, we have to set it
 447        * to NULL for drivers not to set up arrays which are not bound,
 448        * or to prevent a crash if the VAO being unbound is going to be
 449        * deleted.
 450        */
 451       ctx->Array._DrawArrays = NULL;
 452       ctx->Array.DrawMethod = DRAW_NONE;
 453    }
 454
 455    ctx->NewState |= _NEW_ARRAY;
 456    _mesa_reference_vao(ctx, &ctx->Array.VAO, newObj);
 457
 458    /* Pass BindVertexArray call to device driver */
 459    if (ctx->Driver.BindArrayObject && newObj)
 460       ctx->Driver.BindArrayObject(ctx, newObj);
 461 }
 462
 463
 464 /**
 465  * ARB version of glBindVertexArray()
 466  * This function behaves differently from glBindVertexArrayAPPLE() in
 467  * that this function requires all ids to have been previously generated
 468  * by glGenVertexArrays[APPLE]().
 469  */
 470 void GLAPIENTRY
 471 _mesa_BindVertexArray( GLuint id )
 472 {
 473    GET_CURRENT_CONTEXT(ctx);
 474    bind_vertex_array(ctx, id, GL_TRUE);
 475 }
 476
 477
 478 /**
 479  * Bind a new array.
 480  *
 481  * \todo
 482  * The binding could be done more efficiently by comparing the non-NULL
 483  * pointers in the old and new objects.  The only arrays that are "dirty" are
 484  * the ones that are non-NULL in either object.
 485  */
 486 void GLAPIENTRY
 487 _mesa_BindVertexArrayAPPLE( GLuint id )
 488 {
 489    GET_CURRENT_CONTEXT(ctx);
 490    bind_vertex_array(ctx, id, GL_FALSE);
 491 }
 492
 493
 494 /**
 495  * Delete a set of array objects.
 496  *
 497  * \param n      Number of array objects to delete.
 498  * \param ids    Array of \c n array object IDs.
 499  */
 500 void GLAPIENTRY
 501 _mesa_DeleteVertexArrays(GLsizei n, const GLuint *ids)
 502 {
 503    GET_CURRENT_CONTEXT(ctx);
 504    GLsizei i;
 505
 506    if (n < 0) {
 507       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteVertexArray(n)");
 508       return;
 509    }
 510
 511    for (i = 0; i < n; i++) {
 512       struct gl_vertex_array_object *obj = _mesa_lookup_vao(ctx, ids[i]);
 513
 514       if ( obj != NULL ) {
 515          assert( obj->Name == ids[i] );
 516
 517          /* If the array object is currently bound, the spec says "the binding
 518           * for that object reverts to zero and the default vertex array
 519           * becomes current."
 520           */
 521          if ( obj == ctx->Array.VAO ) {
 522             _mesa_BindVertexArray(0);
 523          }
 524
 525          /* The ID is immediately freed for re-use */
 526          remove_array_object(ctx, obj);
 527
 528          if (ctx->Array.LastLookedUpVAO == obj)
 529             _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, NULL);
 530
 531          /* Unreference the array object.
 532           * If refcount hits zero, the object will be deleted.
 533           */
 534          _mesa_reference_vao(ctx, &obj, NULL);
 535       }
 536    }
 537 }
 538
 539
 540 /**
 541  * Generate a set of unique array object IDs and store them in \c arrays.
 542  * Helper for _mesa_GenVertexArrays[APPLE]() and _mesa_CreateVertexArrays()
 543  * below.
 544  *
 545  * \param n       Number of IDs to generate.
 546  * \param arrays  Array of \c n locations to store the IDs.
 547  * \param create  Indicates that the objects should also be created.
 548  * \param func    The name of the GL entry point.
 549  */
 550 static void
 551 gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 552                   bool create, const char *func)
 553 {
 554    GLuint first;
 555    GLint i;
 556
 557    if (n < 0) {
 558       _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func);
 559       return;
 560    }
 561
 562    if (!arrays) {
 563       return;
 564    }
 565
 566    first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n);
 567
 568    /* For the sake of simplicity we create the array objects in both
 569     * the Gen* and Create* cases.  The only difference is the value of
 570     * EverBound, which is set to true in the Create* case.
 571     */
 572    for (i = 0; i < n; i++) {
 573       struct gl_vertex_array_object *obj;
 574       GLuint name = first + i;
 575
 576       obj = (*ctx->Driver.NewArrayObject)( ctx, name );
 577       if (!obj) {
 578          _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
 579          return;
 580       }
 581       obj->EverBound = create;
 582       save_array_object(ctx, obj);
 583       arrays[i] = first + i;
 584    }
 585 }
 586
 587
 588 /**
 589  * ARB version of glGenVertexArrays()
 590  * All arrays will be required to live in VBOs.
 591  */
 592 void GLAPIENTRY
 593 _mesa_GenVertexArrays(GLsizei n, GLuint *arrays)
 594 {
 595    GET_CURRENT_CONTEXT(ctx);
 596    gen_vertex_arrays(ctx, n, arrays, false, "glGenVertexArrays");
 597 }
 598
 599
 600 /**
 601  * APPLE version of glGenVertexArraysAPPLE()
 602  * Arrays may live in VBOs or ordinary memory.
 603  */
 604 void GLAPIENTRY
 605 _mesa_GenVertexArraysAPPLE(GLsizei n, GLuint *arrays)
 606 {
 607    GET_CURRENT_CONTEXT(ctx);
 608    gen_vertex_arrays(ctx, n, arrays, false, "glGenVertexArraysAPPLE");
 609 }
 610
 611
 612 /**
 613  * ARB_direct_state_access
 614  * Generates ID's and creates the array objects.
 615  */
 616 void GLAPIENTRY
 617 _mesa_CreateVertexArrays(GLsizei n, GLuint *arrays)
 618 {
 619    GET_CURRENT_CONTEXT(ctx);
 620
 621    if (!ctx->Extensions.ARB_direct_state_access) {
 622       _mesa_error(ctx, GL_INVALID_OPERATION,
 623                    "glCreateVertexArrays(GL_ARB_direct_state_access "
 624                    "is not supported");
 625       return;
 626    }
 627
 628    gen_vertex_arrays(ctx, n, arrays, true, "glCreateVertexArrays");
 629 }
 630
 631
 632 /**
 633  * Determine if ID is the name of an array object.
 634  *
 635  * \param id  ID of the potential array object.
 636  * \return  \c GL_TRUE if \c id is the name of a array object,
 637  *          \c GL_FALSE otherwise.
 638  */
 639 GLboolean GLAPIENTRY
 640 _mesa_IsVertexArray( GLuint id )
 641 {
 642    struct gl_vertex_array_object * obj;
 643    GET_CURRENT_CONTEXT(ctx);
 644    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 645
 646    if (id == 0)
 647       return GL_FALSE;
 648
 649    obj = _mesa_lookup_vao(ctx, id);
 650    if (obj == NULL)
 651       return GL_FALSE;
 652
 653    return obj->EverBound;
 654 }
 655
 656
 657 /**
 658  * Sets the element array buffer binding of a vertex array object.
 659  *
 660  * This is the ARB_direct_state_access equivalent of
 661  * glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer).
 662  */
 663 void GLAPIENTRY
 664 _mesa_VertexArrayElementBuffer(GLuint vaobj, GLuint buffer)
 665 {
 666    GET_CURRENT_CONTEXT(ctx);
 667    struct gl_vertex_array_object *vao;
 668    struct gl_buffer_object *bufObj;
 669
 670    if (!ctx->Extensions.ARB_direct_state_access) {
 671       _mesa_error(ctx, GL_INVALID_OPERATION,
 672                    "glVertexArrayElementBuffer(GL_ARB_direct_state_access "
 673                    "is not supported");
 674       return;
 675    }
 676
 677    ASSERT_OUTSIDE_BEGIN_END(ctx);
 678
 679    /* The GL_ARB_direct_state_access specification says:
 680     *
 681     *    "An INVALID_OPERATION error is generated by VertexArrayElementBuffer
 682     *     if <vaobj> is not [compatibility profile: zero or] the name of an
 683     *     existing vertex array object."
 684     */
 685    vao =_mesa_lookup_vao_err(ctx, vaobj, "glVertexArrayElementBuffer");
 686    if (!vao)
 687       return;
 688
 689    /* The GL_ARB_direct_state_access specification says:
 690     *
 691     *    "An INVALID_OPERATION error is generated if <buffer> is not zero or
 692     *     the name of an existing buffer object."
 693     */
 694    if (buffer != 0)
 695       bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
 696                                           "glVertexArrayElementBuffer");
 697    else
 698       bufObj = ctx->Shared->NullBufferObj;
 699
 700    if (bufObj)
 701       _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj, bufObj);
 702 }
 703
 704
 705 void GLAPIENTRY
 706 _mesa_GetVertexArrayiv(GLuint vaobj, GLenum pname, GLint *param)
 707 {
 708    GET_CURRENT_CONTEXT(ctx);
 709    struct gl_vertex_array_object *vao;
 710
 711    ASSERT_OUTSIDE_BEGIN_END(ctx);
 712
 713    if (!ctx->Extensions.ARB_direct_state_access) {
 714       _mesa_error(ctx, GL_INVALID_OPERATION,
 715                    "glGetVertexArrayiv(GL_ARB_direct_state_access "
 716                    "is not supported");
 717       return;
 718    }
 719
 720    /* The GL_ARB_direct_state_access specification says:
 721     *
 722     *   "An INVALID_OPERATION error is generated if <vaobj> is not
 723     *    [compatibility profile: zero or] the name of an existing
 724     *    vertex array object."
 725     */
 726    vao =_mesa_lookup_vao_err(ctx, vaobj, "glGetVertexArrayiv");
 727    if (!vao)
 728       return;
 729
 730    /* The GL_ARB_direct_state_access specification says:
 731     *
 732     *   "An INVALID_ENUM error is generated if <pname> is not
 733     *    ELEMENT_ARRAY_BUFFER_BINDING."
 734     */
 735    if (pname != GL_ELEMENT_ARRAY_BUFFER_BINDING) {
 736       _mesa_error(ctx, GL_INVALID_ENUM,
 737                   "glGetVertexArrayiv(pname != "
 738                   "GL_ELEMENT_ARRAY_BUFFER_BINDING)");
 739       return;
 740    }
 741
 742    param[0] = vao->IndexBufferObj->Name;
 743 }