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