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 #include "util/bitscan.h"
  56
  57
  58 /**
  59  * Look up the array object for the given ID.
  60  *
  61  * \returns
  62  * Either a pointer to the array object with the specified ID or \c NULL for
  63  * a non-existent ID.  The spec defines ID 0 as being technically
  64  * non-existent.
  65  */
  66
  67 struct gl_vertex_array_object *
  68 _mesa_lookup_vao(struct gl_context *ctx, GLuint id)
  69 {
  70    if (id == 0)
  71       return NULL;
  72    else
  73       return (struct gl_vertex_array_object *)
  74          _mesa_HashLookup(ctx->Array.Objects, id);
  75 }
  76
  77
  78 /**
  79  * Looks up the array object for the given ID.
  80  *
  81  * Unlike _mesa_lookup_vao, this function generates a GL_INVALID_OPERATION
  82  * error if the array object does not exist. It also returns the default
  83  * array object when ctx is a compatibility profile context and id is zero.
  84  */
  85 struct gl_vertex_array_object *
  86 _mesa_lookup_vao_err(struct gl_context *ctx, GLuint id, const char *caller)
  87 {
  88    /* The ARB_direct_state_access specification says:
  89     *
  90     *    "<vaobj> is [compatibility profile:
  91     *     zero, indicating the default vertex array object, or]
  92     *     the name of the vertex array object."
  93     */
  94    if (id == 0) {
  95       if (ctx->API == API_OPENGL_CORE) {
  96          _mesa_error(ctx, GL_INVALID_OPERATION,
  97                      "%s(zero is not valid vaobj name in a core profile "
  98                      "context)", caller);
  99          return NULL;
 100       }
 101
 102       return ctx->Array.DefaultVAO;
 103    } else {
 104       struct gl_vertex_array_object *vao;
 105
 106       if (ctx->Array.LastLookedUpVAO &&
 107           ctx->Array.LastLookedUpVAO->Name == id) {
 108          vao = ctx->Array.LastLookedUpVAO;
 109       } else {
 110          vao = (struct gl_vertex_array_object *)
 111             _mesa_HashLookup(ctx->Array.Objects, id);
 112
 113          /* The ARB_direct_state_access specification says:
 114           *
 115           *    "An INVALID_OPERATION error is generated if <vaobj> is not
 116           *     [compatibility profile: zero or] the name of an existing
 117           *     vertex array object."
 118           */
 119          if (!vao || !vao->EverBound) {
 120             _mesa_error(ctx, GL_INVALID_OPERATION,
 121                         "%s(non-existent vaobj=%u)", caller, id);
 122             return NULL;
 123          }
 124
 125          _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
 126       }
 127
 128       return vao;
 129    }
 130 }
 131
 132
 133 /**
 134  * For all the vertex binding points in the array object, unbind any pointers
 135  * to any buffer objects (VBOs).
 136  * This is done just prior to array object destruction.
 137  */
 138 static void
 139 unbind_array_object_vbos(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 140 {
 141    GLuint i;
 142
 143    for (i = 0; i < ARRAY_SIZE(obj->VertexBinding); i++)
 144       _mesa_reference_buffer_object(ctx, &obj->VertexBinding[i].BufferObj, NULL);
 145
 146    for (i = 0; i < ARRAY_SIZE(obj->_VertexAttrib); i++)
 147       _mesa_reference_buffer_object(ctx, &obj->_VertexAttrib[i].BufferObj, NULL);
 148 }
 149
 150
 151 /**
 152  * Allocate and initialize a new vertex array object.
 153  */
 154 struct gl_vertex_array_object *
 155 _mesa_new_vao(struct gl_context *ctx, GLuint name)
 156 {
 157    struct gl_vertex_array_object *obj = CALLOC_STRUCT(gl_vertex_array_object);
 158    if (obj)
 159       _mesa_initialize_vao(ctx, obj, name);
 160    return obj;
 161 }
 162
 163
 164 /**
 165  * Delete an array object.
 166  */
 167 void
 168 _mesa_delete_vao(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 169 {
 170    unbind_array_object_vbos(ctx, obj);
 171    _mesa_reference_buffer_object(ctx, &obj->IndexBufferObj, NULL);
 172    mtx_destroy(&obj->Mutex);
 173    free(obj->Label);
 174    free(obj);
 175 }
 176
 177
 178 /**
 179  * Set ptr to vao w/ reference counting.
 180  * Note: this should only be called from the _mesa_reference_vao()
 181  * inline function.
 182  */
 183 void
 184 _mesa_reference_vao_(struct gl_context *ctx,
 185                      struct gl_vertex_array_object **ptr,
 186                      struct gl_vertex_array_object *vao)
 187 {
 188    assert(*ptr != vao);
 189
 190    if (*ptr) {
 191       /* Unreference the old array object */
 192       GLboolean deleteFlag = GL_FALSE;
 193       struct gl_vertex_array_object *oldObj = *ptr;
 194
 195       mtx_lock(&oldObj->Mutex);
 196       assert(oldObj->RefCount > 0);
 197       oldObj->RefCount--;
 198       deleteFlag = (oldObj->RefCount == 0);
 199       mtx_unlock(&oldObj->Mutex);
 200
 201       if (deleteFlag)
 202          _mesa_delete_vao(ctx, oldObj);
 203
 204       *ptr = NULL;
 205    }
 206    assert(!*ptr);
 207
 208    if (vao) {
 209       /* reference new array object */
 210       mtx_lock(&vao->Mutex);
 211       if (vao->RefCount == 0) {
 212          /* this array's being deleted (look just above) */
 213          /* Not sure this can every really happen.  Warn if it does. */
 214          _mesa_problem(NULL, "referencing deleted array object");
 215          *ptr = NULL;
 216       }
 217       else {
 218          vao->RefCount++;
 219          *ptr = vao;
 220       }
 221       mtx_unlock(&vao->Mutex);
 222    }
 223 }
 224
 225
 226 /**
 227  * Initialize attribtes of a vertex array within a vertex array object.
 228  * \param vao  the container vertex array object
 229  * \param index  which array in the VAO to initialize
 230  * \param size  number of components (1, 2, 3 or 4) per attribute
 231  * \param type  datatype of the attribute (GL_FLOAT, GL_INT, etc).
 232  */
 233 static void
 234 init_array(struct gl_context *ctx,
 235            struct gl_vertex_array_object *vao,
 236            GLuint index, GLint size, GLint type)
 237 {
 238    struct gl_vertex_attrib_array *array = &vao->VertexAttrib[index];
 239    struct gl_vertex_buffer_binding *binding = &vao->VertexBinding[index];
 240
 241    array->Size = size;
 242    array->Type = type;
 243    array->Format = GL_RGBA; /* only significant for GL_EXT_vertex_array_bgra */
 244    array->Stride = 0;
 245    array->Ptr = NULL;
 246    array->RelativeOffset = 0;
 247    array->Enabled = GL_FALSE;
 248    array->Normalized = GL_FALSE;
 249    array->Integer = GL_FALSE;
 250    array->Doubles = GL_FALSE;
 251    array->_ElementSize = size * _mesa_sizeof_type(type);
 252    array->BufferBindingIndex = index;
 253
 254    binding->Offset = 0;
 255    binding->Stride = array->_ElementSize;
 256    binding->BufferObj = NULL;
 257    binding->_BoundArrays = BITFIELD64_BIT(index);
 258
 259    /* Vertex array buffers */
 260    _mesa_reference_buffer_object(ctx, &binding->BufferObj,
 261                                  ctx->Shared->NullBufferObj);
 262 }
 263
 264
 265 /**
 266  * Initialize a gl_vertex_array_object's arrays.
 267  */
 268 void
 269 _mesa_initialize_vao(struct gl_context *ctx,
 270                      struct gl_vertex_array_object *vao,
 271                      GLuint name)
 272 {
 273    GLuint i;
 274
 275    vao->Name = name;
 276
 277    mtx_init(&vao->Mutex, mtx_plain);
 278    vao->RefCount = 1;
 279
 280    /* Init the individual arrays */
 281    for (i = 0; i < ARRAY_SIZE(vao->VertexAttrib); i++) {
 282       switch (i) {
 283       case VERT_ATTRIB_WEIGHT:
 284          init_array(ctx, vao, VERT_ATTRIB_WEIGHT, 1, GL_FLOAT);
 285          break;
 286       case VERT_ATTRIB_NORMAL:
 287          init_array(ctx, vao, VERT_ATTRIB_NORMAL, 3, GL_FLOAT);
 288          break;
 289       case VERT_ATTRIB_COLOR1:
 290          init_array(ctx, vao, VERT_ATTRIB_COLOR1, 3, GL_FLOAT);
 291          break;
 292       case VERT_ATTRIB_FOG:
 293          init_array(ctx, vao, VERT_ATTRIB_FOG, 1, GL_FLOAT);
 294          break;
 295       case VERT_ATTRIB_COLOR_INDEX:
 296          init_array(ctx, vao, VERT_ATTRIB_COLOR_INDEX, 1, GL_FLOAT);
 297          break;
 298       case VERT_ATTRIB_EDGEFLAG:
 299          init_array(ctx, vao, VERT_ATTRIB_EDGEFLAG, 1, GL_BOOL);
 300          break;
 301       case VERT_ATTRIB_POINT_SIZE:
 302          init_array(ctx, vao, VERT_ATTRIB_POINT_SIZE, 1, GL_FLOAT);
 303          break;
 304       default:
 305          init_array(ctx, vao, i, 4, GL_FLOAT);
 306          break;
 307       }
 308    }
 309
 310    _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj,
 311                                  ctx->Shared->NullBufferObj);
 312 }
 313
 314
 315 /**
 316  * Add the given array object to the array object pool.
 317  */
 318 static void
 319 save_array_object(struct gl_context *ctx, struct gl_vertex_array_object *vao)
 320 {
 321    if (vao->Name > 0) {
 322       /* insert into hash table */
 323       _mesa_HashInsert(ctx->Array.Objects, vao->Name, vao);
 324    }
 325 }
 326
 327
 328 /**
 329  * Remove the given array object from the array object pool.
 330  * Do not deallocate the array object though.
 331  */
 332 static void
 333 remove_array_object(struct gl_context *ctx, struct gl_vertex_array_object *vao)
 334 {
 335    if (vao->Name > 0) {
 336       /* remove from hash table */
 337       _mesa_HashRemove(ctx->Array.Objects, vao->Name);
 338    }
 339 }
 340
 341
 342 /**
 343  * Updates the derived gl_client_arrays when a gl_vertex_attrib_array
 344  * or a gl_vertex_buffer_binding has changed.
 345  */
 346 void
 347 _mesa_update_vao_client_arrays(struct gl_context *ctx,
 348                                struct gl_vertex_array_object *vao)
 349 {
 350    GLbitfield64 arrays = vao->NewArrays;
 351
 352    while (arrays) {
 353       const int attrib = u_bit_scan64(&arrays);
 354
 355       struct gl_client_array *client_array;
 356       struct gl_vertex_attrib_array *attrib_array;
 357       struct gl_vertex_buffer_binding *buffer_binding;
 358
 359       attrib_array = &vao->VertexAttrib[attrib];
 360       buffer_binding = &vao->VertexBinding[attrib_array->BufferBindingIndex];
 361       client_array = &vao->_VertexAttrib[attrib];
 362
 363       _mesa_update_client_array(ctx, client_array, attrib_array,
 364                                 buffer_binding);
 365    }
 366 }
 367
 368
 369 bool
 370 _mesa_all_varyings_in_vbos(const struct gl_vertex_array_object *vao)
 371 {
 372    /* Walk those enabled arrays that have the default vbo attached */
 373    GLbitfield64 mask = vao->_Enabled & ~vao->VertexAttribBufferMask;
 374
 375    while (mask) {
 376       /* Do not use u_bit_scan64 as we can walk multiple
 377        * attrib arrays at once
 378        */
 379       const int i = ffsll(mask) - 1;
 380       const struct gl_vertex_attrib_array *attrib_array =
 381          &vao->VertexAttrib[i];
 382       const struct gl_vertex_buffer_binding *buffer_binding =
 383          &vao->VertexBinding[attrib_array->BufferBindingIndex];
 384
 385       /* Only enabled arrays shall appear in the _Enabled bitmask */
 386       assert(attrib_array->Enabled);
 387       /* We have already masked out vao->VertexAttribBufferMask  */
 388       assert(!_mesa_is_bufferobj(buffer_binding->BufferObj));
 389
 390       /* Bail out once we find the first non vbo with a non zero stride */
 391       if (buffer_binding->Stride != 0)
 392          return false;
 393
 394       /* Note that we cannot use the xor variant since the _BoundArray mask
 395        * may contain array attributes that are bound but not enabled.
 396        */
 397       mask &= ~buffer_binding->_BoundArrays;
 398    }
 399
 400    return true;
 401 }
 402
 403 bool
 404 _mesa_all_buffers_are_unmapped(const struct gl_vertex_array_object *vao)
 405 {
 406    /* Walk the enabled arrays that have a vbo attached */
 407    GLbitfield64 mask = vao->_Enabled & vao->VertexAttribBufferMask;
 408
 409    while (mask) {
 410       const int i = ffsll(mask) - 1;
 411       const struct gl_vertex_attrib_array *attrib_array =
 412          &vao->VertexAttrib[i];
 413       const struct gl_vertex_buffer_binding *buffer_binding =
 414          &vao->VertexBinding[attrib_array->BufferBindingIndex];
 415
 416       /* Only enabled arrays shall appear in the _Enabled bitmask */
 417       assert(attrib_array->Enabled);
 418       /* We have already masked with vao->VertexAttribBufferMask  */
 419       assert(_mesa_is_bufferobj(buffer_binding->BufferObj));
 420
 421       /* Bail out once we find the first disallowed mapping */
 422       if (_mesa_check_disallowed_mapping(buffer_binding->BufferObj))
 423          return false;
 424
 425       /* We have handled everything that is bound to this buffer_binding. */
 426       mask &= ~buffer_binding->_BoundArrays;
 427    }
 428
 429    return true;
 430 }
 431
 432 /**********************************************************************/
 433 /* API Functions                                                      */
 434 /**********************************************************************/
 435
 436
 437 /**
 438  * Helper for _mesa_BindVertexArray() and _mesa_BindVertexArrayAPPLE().
 439  * \param genRequired  specifies behavour when id was not generated with
 440  *                     glGenVertexArrays().
 441  */
 442 static void
 443 bind_vertex_array(struct gl_context *ctx, GLuint id, GLboolean genRequired)
 444 {
 445    struct gl_vertex_array_object * const oldObj = ctx->Array.VAO;
 446    struct gl_vertex_array_object *newObj = NULL;
 447
 448    assert(oldObj != NULL);
 449
 450    if ( oldObj->Name == id )
 451       return;   /* rebinding the same array object- no change */
 452
 453    /*
 454     * Get pointer to new array object (newObj)
 455     */
 456    if (id == 0) {
 457       /* The spec says there is no array object named 0, but we use
 458        * one internally because it simplifies things.
 459        */
 460       newObj = ctx->Array.DefaultVAO;
 461    }
 462    else {
 463       /* non-default array object */
 464       newObj = _mesa_lookup_vao(ctx, id);
 465       if (!newObj) {
 466          if (genRequired) {
 467             _mesa_error(ctx, GL_INVALID_OPERATION,
 468                         "glBindVertexArray(non-gen name)");
 469             return;
 470          }
 471
 472          /* For APPLE version, generate a new array object now */
 473          newObj = _mesa_new_vao(ctx, id);
 474          if (!newObj) {
 475             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindVertexArrayAPPLE");
 476             return;
 477          }
 478
 479          save_array_object(ctx, newObj);
 480       }
 481
 482       if (!newObj->EverBound) {
 483          /* The "Interactions with APPLE_vertex_array_object" section of the
 484           * GL_ARB_vertex_array_object spec says:
 485           *
 486           *     "The first bind call, either BindVertexArray or
 487           *     BindVertexArrayAPPLE, determines the semantic of the object."
 488           */
 489          newObj->ARBsemantics = genRequired;
 490          newObj->EverBound = GL_TRUE;
 491       }
 492    }
 493
 494    if (ctx->Array.DrawMethod == DRAW_ARRAYS) {
 495       /* The _DrawArrays pointer is pointing at the VAO being unbound and
 496        * that VAO may be in the process of being deleted. If it's not going
 497        * to be deleted, this will have no effect, because the pointer needs
 498        * to be updated by the VBO module anyway.
 499        *
 500        * Before the VBO module can update the pointer, we have to set it
 501        * to NULL for drivers not to set up arrays which are not bound,
 502        * or to prevent a crash if the VAO being unbound is going to be
 503        * deleted.
 504        */
 505       ctx->Array._DrawArrays = NULL;
 506       ctx->Array.DrawMethod = DRAW_NONE;
 507    }
 508
 509    ctx->NewState |= _NEW_ARRAY;
 510    _mesa_reference_vao(ctx, &ctx->Array.VAO, newObj);
 511 }
 512
 513
 514 /**
 515  * ARB version of glBindVertexArray()
 516  * This function behaves differently from glBindVertexArrayAPPLE() in
 517  * that this function requires all ids to have been previously generated
 518  * by glGenVertexArrays[APPLE]().
 519  */
 520 void GLAPIENTRY
 521 _mesa_BindVertexArray( GLuint id )
 522 {
 523    GET_CURRENT_CONTEXT(ctx);
 524    bind_vertex_array(ctx, id, GL_TRUE);
 525 }
 526
 527
 528 /**
 529  * Bind a new array.
 530  *
 531  * \todo
 532  * The binding could be done more efficiently by comparing the non-NULL
 533  * pointers in the old and new objects.  The only arrays that are "dirty" are
 534  * the ones that are non-NULL in either object.
 535  */
 536 void GLAPIENTRY
 537 _mesa_BindVertexArrayAPPLE( GLuint id )
 538 {
 539    GET_CURRENT_CONTEXT(ctx);
 540    bind_vertex_array(ctx, id, GL_FALSE);
 541 }
 542
 543
 544 /**
 545  * Delete a set of array objects.
 546  *
 547  * \param n      Number of array objects to delete.
 548  * \param ids    Array of \c n array object IDs.
 549  */
 550 void GLAPIENTRY
 551 _mesa_DeleteVertexArrays(GLsizei n, const GLuint *ids)
 552 {
 553    GET_CURRENT_CONTEXT(ctx);
 554    GLsizei i;
 555
 556    if (n < 0) {
 557       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteVertexArray(n)");
 558       return;
 559    }
 560
 561    for (i = 0; i < n; i++) {
 562       struct gl_vertex_array_object *obj = _mesa_lookup_vao(ctx, ids[i]);
 563
 564       if ( obj != NULL ) {
 565          assert( obj->Name == ids[i] );
 566
 567          /* If the array object is currently bound, the spec says "the binding
 568           * for that object reverts to zero and the default vertex array
 569           * becomes current."
 570           */
 571          if ( obj == ctx->Array.VAO ) {
 572             _mesa_BindVertexArray(0);
 573          }
 574
 575          /* The ID is immediately freed for re-use */
 576          remove_array_object(ctx, obj);
 577
 578          if (ctx->Array.LastLookedUpVAO == obj)
 579             _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, NULL);
 580
 581          /* Unreference the array object.
 582           * If refcount hits zero, the object will be deleted.
 583           */
 584          _mesa_reference_vao(ctx, &obj, NULL);
 585       }
 586    }
 587 }
 588
 589
 590 /**
 591  * Generate a set of unique array object IDs and store them in \c arrays.
 592  * Helper for _mesa_GenVertexArrays[APPLE]() and _mesa_CreateVertexArrays()
 593  * below.
 594  *
 595  * \param n       Number of IDs to generate.
 596  * \param arrays  Array of \c n locations to store the IDs.
 597  * \param create  Indicates that the objects should also be created.
 598  * \param func    The name of the GL entry point.
 599  */
 600 static void
 601 gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 602                   bool create, const char *func)
 603 {
 604    GLuint first;
 605    GLint i;
 606
 607    if (n < 0) {
 608       _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func);
 609       return;
 610    }
 611
 612    if (!arrays) {
 613       return;
 614    }
 615
 616    first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n);
 617
 618    /* For the sake of simplicity we create the array objects in both
 619     * the Gen* and Create* cases.  The only difference is the value of
 620     * EverBound, which is set to true in the Create* case.
 621     */
 622    for (i = 0; i < n; i++) {
 623       struct gl_vertex_array_object *obj;
 624       GLuint name = first + i;
 625
 626       obj = _mesa_new_vao(ctx, name);
 627       if (!obj) {
 628          _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
 629          return;
 630       }
 631       obj->EverBound = create;
 632       save_array_object(ctx, obj);
 633       arrays[i] = first + i;
 634    }
 635 }
 636
 637
 638 /**
 639  * ARB version of glGenVertexArrays()
 640  * All arrays will be required to live in VBOs.
 641  */
 642 void GLAPIENTRY
 643 _mesa_GenVertexArrays(GLsizei n, GLuint *arrays)
 644 {
 645    GET_CURRENT_CONTEXT(ctx);
 646    gen_vertex_arrays(ctx, n, arrays, false, "glGenVertexArrays");
 647 }
 648
 649
 650 /**
 651  * APPLE version of glGenVertexArraysAPPLE()
 652  * Arrays may live in VBOs or ordinary memory.
 653  */
 654 void GLAPIENTRY
 655 _mesa_GenVertexArraysAPPLE(GLsizei n, GLuint *arrays)
 656 {
 657    GET_CURRENT_CONTEXT(ctx);
 658    gen_vertex_arrays(ctx, n, arrays, false, "glGenVertexArraysAPPLE");
 659 }
 660
 661
 662 /**
 663  * ARB_direct_state_access
 664  * Generates ID's and creates the array objects.
 665  */
 666 void GLAPIENTRY
 667 _mesa_CreateVertexArrays(GLsizei n, GLuint *arrays)
 668 {
 669    GET_CURRENT_CONTEXT(ctx);
 670    gen_vertex_arrays(ctx, n, arrays, true, "glCreateVertexArrays");
 671 }
 672
 673
 674 /**
 675  * Determine if ID is the name of an array object.
 676  *
 677  * \param id  ID of the potential array object.
 678  * \return  \c GL_TRUE if \c id is the name of a array object,
 679  *          \c GL_FALSE otherwise.
 680  */
 681 GLboolean GLAPIENTRY
 682 _mesa_IsVertexArray( GLuint id )
 683 {
 684    struct gl_vertex_array_object * obj;
 685    GET_CURRENT_CONTEXT(ctx);
 686    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 687
 688    if (id == 0)
 689       return GL_FALSE;
 690
 691    obj = _mesa_lookup_vao(ctx, id);
 692    if (obj == NULL)
 693       return GL_FALSE;
 694
 695    return obj->EverBound;
 696 }
 697
 698
 699 /**
 700  * Sets the element array buffer binding of a vertex array object.
 701  *
 702  * This is the ARB_direct_state_access equivalent of
 703  * glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer).
 704  */
 705 void GLAPIENTRY
 706 _mesa_VertexArrayElementBuffer(GLuint vaobj, GLuint buffer)
 707 {
 708    GET_CURRENT_CONTEXT(ctx);
 709    struct gl_vertex_array_object *vao;
 710    struct gl_buffer_object *bufObj;
 711
 712    ASSERT_OUTSIDE_BEGIN_END(ctx);
 713
 714    /* The GL_ARB_direct_state_access specification says:
 715     *
 716     *    "An INVALID_OPERATION error is generated by VertexArrayElementBuffer
 717     *     if <vaobj> is not [compatibility profile: zero or] the name of an
 718     *     existing vertex array object."
 719     */
 720    vao =_mesa_lookup_vao_err(ctx, vaobj, "glVertexArrayElementBuffer");
 721    if (!vao)
 722       return;
 723
 724    /* The GL_ARB_direct_state_access specification says:
 725     *
 726     *    "An INVALID_OPERATION error is generated if <buffer> is not zero or
 727     *     the name of an existing buffer object."
 728     */
 729    if (buffer != 0)
 730       bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
 731                                           "glVertexArrayElementBuffer");
 732    else
 733       bufObj = ctx->Shared->NullBufferObj;
 734
 735    if (bufObj)
 736       _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj, bufObj);
 737 }
 738
 739
 740 void GLAPIENTRY
 741 _mesa_GetVertexArrayiv(GLuint vaobj, GLenum pname, GLint *param)
 742 {
 743    GET_CURRENT_CONTEXT(ctx);
 744    struct gl_vertex_array_object *vao;
 745
 746    ASSERT_OUTSIDE_BEGIN_END(ctx);
 747
 748    /* The GL_ARB_direct_state_access specification says:
 749     *
 750     *   "An INVALID_OPERATION error is generated if <vaobj> is not
 751     *    [compatibility profile: zero or] the name of an existing
 752     *    vertex array object."
 753     */
 754    vao =_mesa_lookup_vao_err(ctx, vaobj, "glGetVertexArrayiv");
 755    if (!vao)
 756       return;
 757
 758    /* The GL_ARB_direct_state_access specification says:
 759     *
 760     *   "An INVALID_ENUM error is generated if <pname> is not
 761     *    ELEMENT_ARRAY_BUFFER_BINDING."
 762     */
 763    if (pname != GL_ELEMENT_ARRAY_BUFFER_BINDING) {
 764       _mesa_error(ctx, GL_INVALID_ENUM,
 765                   "glGetVertexArrayiv(pname != "
 766                   "GL_ELEMENT_ARRAY_BUFFER_BINDING)");
 767       return;
 768    }
 769
 770    param[0] = vao->IndexBufferObj->Name;
 771 }