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.
  33  *
  34  * \todo
  35  * The code in this file borrows a lot from bufferobj.c.  There's a certain
  36  * amount of cruft left over from that origin that may be unnecessary.
  37  *
  38  * \author Ian Romanick <idr@us.ibm.com>
  39  * \author Brian Paul
  40  */
  41
  42
  43 #include "glheader.h"
  44 #include "hash.h"
  45 #include "image.h"
  46 #include "imports.h"
  47 #include "context.h"
  48 #include "bufferobj.h"
  49 #include "arrayobj.h"
  50 #include "macros.h"
  51 #include "mtypes.h"
  52 #include "varray.h"
  53 #include "main/dispatch.h"
  54 #include "util/bitscan.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       struct gl_vertex_array_object *vao;
  73
  74       if (ctx->Array.LastLookedUpVAO &&
  75           ctx->Array.LastLookedUpVAO->Name == id) {
  76          vao = ctx->Array.LastLookedUpVAO;
  77       } else {
  78          vao = (struct gl_vertex_array_object *)
  79             _mesa_HashLookupLocked(ctx->Array.Objects, id);
  80
  81          _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
  82       }
  83
  84       return vao;
  85    }
  86 }
  87
  88
  89 /**
  90  * Looks up the array object for the given ID.
  91  *
  92  * Unlike _mesa_lookup_vao, this function generates a GL_INVALID_OPERATION
  93  * error if the array object does not exist. It also returns the default
  94  * array object when ctx is a compatibility profile context and id is zero.
  95  */
  96 struct gl_vertex_array_object *
  97 _mesa_lookup_vao_err(struct gl_context *ctx, GLuint id, const char *caller)
  98 {
  99    /* The ARB_direct_state_access specification says:
 100     *
 101     *    "<vaobj> is [compatibility profile:
 102     *     zero, indicating the default vertex array object, or]
 103     *     the name of the vertex array object."
 104     */
 105    if (id == 0) {
 106       if (ctx->API == API_OPENGL_CORE) {
 107          _mesa_error(ctx, GL_INVALID_OPERATION,
 108                      "%s(zero is not valid vaobj name in a core profile "
 109                      "context)", caller);
 110          return NULL;
 111       }
 112
 113       return ctx->Array.DefaultVAO;
 114    } else {
 115       struct gl_vertex_array_object *vao;
 116
 117       if (ctx->Array.LastLookedUpVAO &&
 118           ctx->Array.LastLookedUpVAO->Name == id) {
 119          vao = ctx->Array.LastLookedUpVAO;
 120       } else {
 121          vao = (struct gl_vertex_array_object *)
 122             _mesa_HashLookupLocked(ctx->Array.Objects, id);
 123
 124          /* The ARB_direct_state_access specification says:
 125           *
 126           *    "An INVALID_OPERATION error is generated if <vaobj> is not
 127           *     [compatibility profile: zero or] the name of an existing
 128           *     vertex array object."
 129           */
 130          if (!vao || !vao->EverBound) {
 131             _mesa_error(ctx, GL_INVALID_OPERATION,
 132                         "%s(non-existent vaobj=%u)", caller, id);
 133             return NULL;
 134          }
 135
 136          _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
 137       }
 138
 139       return vao;
 140    }
 141 }
 142
 143
 144 /**
 145  * For all the vertex binding points in the array object, unbind any pointers
 146  * to any buffer objects (VBOs).
 147  * This is done just prior to array object destruction.
 148  */
 149 static void
 150 unbind_array_object_vbos(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 151 {
 152    GLuint i;
 153
 154    for (i = 0; i < ARRAY_SIZE(obj->BufferBinding); i++)
 155       _mesa_reference_buffer_object(ctx, &obj->BufferBinding[i].BufferObj, NULL);
 156
 157    for (i = 0; i < ARRAY_SIZE(obj->_VertexAttrib); i++)
 158       _mesa_reference_buffer_object(ctx, &obj->_VertexAttrib[i].BufferObj, NULL);
 159 }
 160
 161
 162 /**
 163  * Allocate and initialize a new vertex array object.
 164  */
 165 struct gl_vertex_array_object *
 166 _mesa_new_vao(struct gl_context *ctx, GLuint name)
 167 {
 168    struct gl_vertex_array_object *obj = CALLOC_STRUCT(gl_vertex_array_object);
 169    if (obj)
 170       _mesa_initialize_vao(ctx, obj, name);
 171    return obj;
 172 }
 173
 174
 175 /**
 176  * Delete an array object.
 177  */
 178 void
 179 _mesa_delete_vao(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 180 {
 181    unbind_array_object_vbos(ctx, obj);
 182    _mesa_reference_buffer_object(ctx, &obj->IndexBufferObj, NULL);
 183    free(obj->Label);
 184    free(obj);
 185 }
 186
 187
 188 /**
 189  * Set ptr to vao w/ reference counting.
 190  * Note: this should only be called from the _mesa_reference_vao()
 191  * inline function.
 192  */
 193 void
 194 _mesa_reference_vao_(struct gl_context *ctx,
 195                      struct gl_vertex_array_object **ptr,
 196                      struct gl_vertex_array_object *vao)
 197 {
 198    assert(*ptr != vao);
 199
 200    if (*ptr) {
 201       /* Unreference the old array object */
 202       struct gl_vertex_array_object *oldObj = *ptr;
 203
 204       assert(oldObj->RefCount > 0);
 205       oldObj->RefCount--;
 206
 207       if (oldObj->RefCount == 0)
 208          _mesa_delete_vao(ctx, oldObj);
 209
 210       *ptr = NULL;
 211    }
 212    assert(!*ptr);
 213
 214    if (vao) {
 215       /* reference new array object */
 216       assert(vao->RefCount > 0);
 217
 218       vao->RefCount++;
 219       *ptr = vao;
 220    }
 221 }
 222
 223
 224 /**
 225  * Initialize attribtes of a vertex array within a vertex array object.
 226  * \param vao  the container vertex array object
 227  * \param index  which array in the VAO to initialize
 228  * \param size  number of components (1, 2, 3 or 4) per attribute
 229  * \param type  datatype of the attribute (GL_FLOAT, GL_INT, etc).
 230  */
 231 static void
 232 init_array(struct gl_context *ctx,
 233            struct gl_vertex_array_object *vao,
 234            GLuint index, GLint size, GLint type)
 235 {
 236    struct gl_array_attributes *array = &vao->VertexAttrib[index];
 237    struct gl_vertex_buffer_binding *binding = &vao->BufferBinding[index];
 238
 239    array->Size = size;
 240    array->Type = type;
 241    array->Format = GL_RGBA; /* only significant for GL_EXT_vertex_array_bgra */
 242    array->Stride = 0;
 243    array->Ptr = NULL;
 244    array->RelativeOffset = 0;
 245    array->Enabled = GL_FALSE;
 246    array->Normalized = GL_FALSE;
 247    array->Integer = GL_FALSE;
 248    array->Doubles = GL_FALSE;
 249    array->_ElementSize = size * _mesa_sizeof_type(type);
 250    array->BufferBindingIndex = index;
 251
 252    binding->Offset = 0;
 253    binding->Stride = array->_ElementSize;
 254    binding->BufferObj = NULL;
 255    binding->_BoundArrays = BITFIELD64_BIT(index);
 256
 257    /* Vertex array buffers */
 258    _mesa_reference_buffer_object(ctx, &binding->BufferObj,
 259                                  ctx->Shared->NullBufferObj);
 260 }
 261
 262
 263 /**
 264  * Initialize a gl_vertex_array_object's arrays.
 265  */
 266 void
 267 _mesa_initialize_vao(struct gl_context *ctx,
 268                      struct gl_vertex_array_object *vao,
 269                      GLuint name)
 270 {
 271    GLuint i;
 272
 273    vao->Name = name;
 274
 275    vao->RefCount = 1;
 276
 277    /* Init the individual arrays */
 278    for (i = 0; i < ARRAY_SIZE(vao->VertexAttrib); i++) {
 279       switch (i) {
 280       case VERT_ATTRIB_WEIGHT:
 281          init_array(ctx, vao, VERT_ATTRIB_WEIGHT, 1, GL_FLOAT);
 282          break;
 283       case VERT_ATTRIB_NORMAL:
 284          init_array(ctx, vao, VERT_ATTRIB_NORMAL, 3, GL_FLOAT);
 285          break;
 286       case VERT_ATTRIB_COLOR1:
 287          init_array(ctx, vao, VERT_ATTRIB_COLOR1, 3, GL_FLOAT);
 288          break;
 289       case VERT_ATTRIB_FOG:
 290          init_array(ctx, vao, VERT_ATTRIB_FOG, 1, GL_FLOAT);
 291          break;
 292       case VERT_ATTRIB_COLOR_INDEX:
 293          init_array(ctx, vao, VERT_ATTRIB_COLOR_INDEX, 1, GL_FLOAT);
 294          break;
 295       case VERT_ATTRIB_EDGEFLAG:
 296          init_array(ctx, vao, VERT_ATTRIB_EDGEFLAG, 1, GL_BOOL);
 297          break;
 298       case VERT_ATTRIB_POINT_SIZE:
 299          init_array(ctx, vao, VERT_ATTRIB_POINT_SIZE, 1, GL_FLOAT);
 300          break;
 301       default:
 302          init_array(ctx, vao, i, 4, GL_FLOAT);
 303          break;
 304       }
 305    }
 306
 307    _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj,
 308                                  ctx->Shared->NullBufferObj);
 309 }
 310
 311
 312 /**
 313  * Updates the derived gl_vertex_arrays when a gl_vertex_attrib_array
 314  * or a gl_vertex_buffer_binding has changed.
 315  */
 316 void
 317 _mesa_update_vao_client_arrays(struct gl_context *ctx,
 318                                struct gl_vertex_array_object *vao)
 319 {
 320    GLbitfield64 arrays = vao->NewArrays;
 321
 322    while (arrays) {
 323       const int attrib = u_bit_scan64(&arrays);
 324       struct gl_vertex_array *client_array = &vao->_VertexAttrib[attrib];
 325       const struct gl_array_attributes *attrib_array =
 326          &vao->VertexAttrib[attrib];
 327       const struct gl_vertex_buffer_binding *buffer_binding =
 328          &vao->BufferBinding[attrib_array->BufferBindingIndex];
 329
 330       _mesa_update_client_array(ctx, client_array, attrib_array,
 331                                 buffer_binding);
 332    }
 333 }
 334
 335
 336 bool
 337 _mesa_all_varyings_in_vbos(const struct gl_vertex_array_object *vao)
 338 {
 339    /* Walk those enabled arrays that have the default vbo attached */
 340    GLbitfield64 mask = vao->_Enabled & ~vao->VertexAttribBufferMask;
 341
 342    while (mask) {
 343       /* Do not use u_bit_scan64 as we can walk multiple
 344        * attrib arrays at once
 345        */
 346       const int i = ffsll(mask) - 1;
 347       const struct gl_array_attributes *attrib_array =
 348          &vao->VertexAttrib[i];
 349       const struct gl_vertex_buffer_binding *buffer_binding =
 350          &vao->BufferBinding[attrib_array->BufferBindingIndex];
 351
 352       /* Only enabled arrays shall appear in the _Enabled bitmask */
 353       assert(attrib_array->Enabled);
 354       /* We have already masked out vao->VertexAttribBufferMask  */
 355       assert(!_mesa_is_bufferobj(buffer_binding->BufferObj));
 356
 357       /* Bail out once we find the first non vbo with a non zero stride */
 358       if (buffer_binding->Stride != 0)
 359          return false;
 360
 361       /* Note that we cannot use the xor variant since the _BoundArray mask
 362        * may contain array attributes that are bound but not enabled.
 363        */
 364       mask &= ~buffer_binding->_BoundArrays;
 365    }
 366
 367    return true;
 368 }
 369
 370 bool
 371 _mesa_all_buffers_are_unmapped(const struct gl_vertex_array_object *vao)
 372 {
 373    /* Walk the enabled arrays that have a vbo attached */
 374    GLbitfield64 mask = vao->_Enabled & vao->VertexAttribBufferMask;
 375
 376    while (mask) {
 377       const int i = ffsll(mask) - 1;
 378       const struct gl_array_attributes *attrib_array =
 379          &vao->VertexAttrib[i];
 380       const struct gl_vertex_buffer_binding *buffer_binding =
 381          &vao->BufferBinding[attrib_array->BufferBindingIndex];
 382
 383       /* Only enabled arrays shall appear in the _Enabled bitmask */
 384       assert(attrib_array->Enabled);
 385       /* We have already masked with vao->VertexAttribBufferMask  */
 386       assert(_mesa_is_bufferobj(buffer_binding->BufferObj));
 387
 388       /* Bail out once we find the first disallowed mapping */
 389       if (_mesa_check_disallowed_mapping(buffer_binding->BufferObj))
 390          return false;
 391
 392       /* We have handled everything that is bound to this buffer_binding. */
 393       mask &= ~buffer_binding->_BoundArrays;
 394    }
 395
 396    return true;
 397 }
 398
 399 /**********************************************************************/
 400 /* API Functions                                                      */
 401 /**********************************************************************/
 402
 403
 404 /**
 405  * ARB version of glBindVertexArray()
 406  */
 407 static ALWAYS_INLINE void
 408 bind_vertex_array(struct gl_context *ctx, GLuint id, bool no_error)
 409 {
 410    struct gl_vertex_array_object *const oldObj = ctx->Array.VAO;
 411    struct gl_vertex_array_object *newObj = NULL;
 412
 413    assert(oldObj != NULL);
 414
 415    if (oldObj->Name == id)
 416       return;   /* rebinding the same array object- no change */
 417
 418    /*
 419     * Get pointer to new array object (newObj)
 420     */
 421    if (id == 0) {
 422       /* The spec says there is no array object named 0, but we use
 423        * one internally because it simplifies things.
 424        */
 425       newObj = ctx->Array.DefaultVAO;
 426    }
 427    else {
 428       /* non-default array object */
 429       newObj = _mesa_lookup_vao(ctx, id);
 430       if (!no_error && !newObj) {
 431          _mesa_error(ctx, GL_INVALID_OPERATION,
 432                      "glBindVertexArray(non-gen name)");
 433          return;
 434       }
 435
 436       newObj->EverBound = GL_TRUE;
 437    }
 438
 439    if (ctx->Array.DrawMethod == DRAW_ARRAYS) {
 440       /* The _DrawArrays pointer is pointing at the VAO being unbound and
 441        * that VAO may be in the process of being deleted. If it's not going
 442        * to be deleted, this will have no effect, because the pointer needs
 443        * to be updated by the VBO module anyway.
 444        *
 445        * Before the VBO module can update the pointer, we have to set it
 446        * to NULL for drivers not to set up arrays which are not bound,
 447        * or to prevent a crash if the VAO being unbound is going to be
 448        * deleted.
 449        */
 450       ctx->Array._DrawArrays = NULL;
 451       ctx->Array.DrawMethod = DRAW_NONE;
 452    }
 453
 454    ctx->NewState |= _NEW_ARRAY;
 455    _mesa_reference_vao(ctx, &ctx->Array.VAO, newObj);
 456 }
 457
 458
 459 void GLAPIENTRY
 460 _mesa_BindVertexArray_no_error(GLuint id)
 461 {
 462    GET_CURRENT_CONTEXT(ctx);
 463    bind_vertex_array(ctx, id, true);
 464 }
 465
 466
 467 void GLAPIENTRY
 468 _mesa_BindVertexArray(GLuint id)
 469 {
 470    GET_CURRENT_CONTEXT(ctx);
 471    bind_vertex_array(ctx, id, false);
 472 }
 473
 474
 475 /**
 476  * Delete a set of array objects.
 477  *
 478  * \param n      Number of array objects to delete.
 479  * \param ids    Array of \c n array object IDs.
 480  */
 481 static void
 482 delete_vertex_arrays(struct gl_context *ctx, GLsizei n, const GLuint *ids)
 483 {
 484    GLsizei i;
 485
 486    for (i = 0; i < n; i++) {
 487       struct gl_vertex_array_object *obj = _mesa_lookup_vao(ctx, ids[i]);
 488
 489       if (obj) {
 490          assert(obj->Name == ids[i]);
 491
 492          /* If the array object is currently bound, the spec says "the binding
 493           * for that object reverts to zero and the default vertex array
 494           * becomes current."
 495           */
 496          if (obj == ctx->Array.VAO)
 497             _mesa_BindVertexArray_no_error(0);
 498
 499          /* The ID is immediately freed for re-use */
 500          _mesa_HashRemoveLocked(ctx->Array.Objects, obj->Name);
 501
 502          if (ctx->Array.LastLookedUpVAO == obj)
 503             _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, NULL);
 504
 505          /* Unreference the array object.
 506           * If refcount hits zero, the object will be deleted.
 507           */
 508          _mesa_reference_vao(ctx, &obj, NULL);
 509       }
 510    }
 511 }
 512
 513
 514 void GLAPIENTRY
 515 _mesa_DeleteVertexArrays_no_error(GLsizei n, const GLuint *ids)
 516 {
 517    GET_CURRENT_CONTEXT(ctx);
 518    delete_vertex_arrays(ctx, n, ids);
 519 }
 520
 521
 522 void GLAPIENTRY
 523 _mesa_DeleteVertexArrays(GLsizei n, const GLuint *ids)
 524 {
 525    GET_CURRENT_CONTEXT(ctx);
 526
 527    if (n < 0) {
 528       _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteVertexArray(n)");
 529       return;
 530    }
 531
 532    delete_vertex_arrays(ctx, n, ids);
 533 }
 534
 535
 536 /**
 537  * Generate a set of unique array object IDs and store them in \c arrays.
 538  * Helper for _mesa_GenVertexArrays() and _mesa_CreateVertexArrays()
 539  * below.
 540  *
 541  * \param n       Number of IDs to generate.
 542  * \param arrays  Array of \c n locations to store the IDs.
 543  * \param create  Indicates that the objects should also be created.
 544  * \param func    The name of the GL entry point.
 545  */
 546 static void
 547 gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 548                   bool create, const char *func)
 549 {
 550    GLuint first;
 551    GLint i;
 552
 553    if (!arrays)
 554       return;
 555
 556    first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n);
 557
 558    /* For the sake of simplicity we create the array objects in both
 559     * the Gen* and Create* cases.  The only difference is the value of
 560     * EverBound, which is set to true in the Create* case.
 561     */
 562    for (i = 0; i < n; i++) {
 563       struct gl_vertex_array_object *obj;
 564       GLuint name = first + i;
 565
 566       obj = _mesa_new_vao(ctx, name);
 567       if (!obj) {
 568          _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
 569          return;
 570       }
 571       obj->EverBound = create;
 572       _mesa_HashInsertLocked(ctx->Array.Objects, obj->Name, obj);
 573       arrays[i] = first + i;
 574    }
 575 }
 576
 577
 578 static void
 579 gen_vertex_arrays_err(struct gl_context *ctx, GLsizei n, GLuint *arrays,
 580                       bool create, const char *func)
 581 {
 582    if (n < 0) {
 583       _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func);
 584       return;
 585    }
 586
 587    gen_vertex_arrays(ctx, n, arrays, create, func);
 588 }
 589
 590
 591 /**
 592  * ARB version of glGenVertexArrays()
 593  * All arrays will be required to live in VBOs.
 594  */
 595 void GLAPIENTRY
 596 _mesa_GenVertexArrays_no_error(GLsizei n, GLuint *arrays)
 597 {
 598    GET_CURRENT_CONTEXT(ctx);
 599    gen_vertex_arrays(ctx, n, arrays, false, "glGenVertexArrays");
 600 }
 601
 602
 603 void GLAPIENTRY
 604 _mesa_GenVertexArrays(GLsizei n, GLuint *arrays)
 605 {
 606    GET_CURRENT_CONTEXT(ctx);
 607    gen_vertex_arrays_err(ctx, n, arrays, false, "glGenVertexArrays");
 608 }
 609
 610
 611 /**
 612  * ARB_direct_state_access
 613  * Generates ID's and creates the array objects.
 614  */
 615 void GLAPIENTRY
 616 _mesa_CreateVertexArrays_no_error(GLsizei n, GLuint *arrays)
 617 {
 618    GET_CURRENT_CONTEXT(ctx);
 619    gen_vertex_arrays(ctx, n, arrays, true, "glCreateVertexArrays");
 620 }
 621
 622
 623 void GLAPIENTRY
 624 _mesa_CreateVertexArrays(GLsizei n, GLuint *arrays)
 625 {
 626    GET_CURRENT_CONTEXT(ctx);
 627    gen_vertex_arrays_err(ctx, n, arrays, true, "glCreateVertexArrays");
 628 }
 629
 630
 631 /**
 632  * Determine if ID is the name of an array object.
 633  *
 634  * \param id  ID of the potential array object.
 635  * \return  \c GL_TRUE if \c id is the name of a array object,
 636  *          \c GL_FALSE otherwise.
 637  */
 638 GLboolean GLAPIENTRY
 639 _mesa_IsVertexArray( GLuint id )
 640 {
 641    struct gl_vertex_array_object * obj;
 642    GET_CURRENT_CONTEXT(ctx);
 643    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 644
 645    obj = _mesa_lookup_vao(ctx, id);
 646
 647    return obj != NULL && obj->EverBound;
 648 }
 649
 650
 651 /**
 652  * Sets the element array buffer binding of a vertex array object.
 653  *
 654  * This is the ARB_direct_state_access equivalent of
 655  * glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer).
 656  */
 657 static ALWAYS_INLINE void
 658 vertex_array_element_buffer(struct gl_context *ctx, GLuint vaobj, GLuint buffer,
 659                             bool no_error)
 660 {
 661    struct gl_vertex_array_object *vao;
 662    struct gl_buffer_object *bufObj;
 663
 664    ASSERT_OUTSIDE_BEGIN_END(ctx);
 665
 666    if (!no_error) {
 667       /* The GL_ARB_direct_state_access specification says:
 668        *
 669        *    "An INVALID_OPERATION error is generated by
 670        *     VertexArrayElementBuffer if <vaobj> is not [compatibility profile:
 671        *     zero or] the name of an existing vertex array object."
 672        */
 673       vao =_mesa_lookup_vao_err(ctx, vaobj, "glVertexArrayElementBuffer");
 674       if (!vao)
 675          return;
 676    } else {
 677       vao = _mesa_lookup_vao(ctx, vaobj);
 678    }
 679
 680    if (buffer != 0) {
 681       if (!no_error) {
 682          /* The GL_ARB_direct_state_access specification says:
 683           *
 684           *    "An INVALID_OPERATION error is generated if <buffer> is not zero
 685           *     or the name of an existing buffer object."
 686           */
 687          bufObj = _mesa_lookup_bufferobj_err(ctx, buffer,
 688                                              "glVertexArrayElementBuffer");
 689       } else {
 690          bufObj = _mesa_lookup_bufferobj(ctx, buffer);
 691       }
 692    } else {
 693       bufObj = ctx->Shared->NullBufferObj;
 694    }
 695
 696    if (bufObj)
 697       _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj, bufObj);
 698 }
 699
 700
 701 void GLAPIENTRY
 702 _mesa_VertexArrayElementBuffer_no_error(GLuint vaobj, GLuint buffer)
 703 {
 704    GET_CURRENT_CONTEXT(ctx);
 705    vertex_array_element_buffer(ctx, vaobj, buffer, true);
 706 }
 707
 708
 709 void GLAPIENTRY
 710 _mesa_VertexArrayElementBuffer(GLuint vaobj, GLuint buffer)
 711 {
 712    GET_CURRENT_CONTEXT(ctx);
 713    vertex_array_element_buffer(ctx, vaobj, buffer, false);
 714 }
 715
 716
 717 void GLAPIENTRY
 718 _mesa_GetVertexArrayiv(GLuint vaobj, GLenum pname, GLint *param)
 719 {
 720    GET_CURRENT_CONTEXT(ctx);
 721    struct gl_vertex_array_object *vao;
 722
 723    ASSERT_OUTSIDE_BEGIN_END(ctx);
 724
 725    /* The GL_ARB_direct_state_access specification says:
 726     *
 727     *   "An INVALID_OPERATION error is generated if <vaobj> is not
 728     *    [compatibility profile: zero or] the name of an existing
 729     *    vertex array object."
 730     */
 731    vao =_mesa_lookup_vao_err(ctx, vaobj, "glGetVertexArrayiv");
 732    if (!vao)
 733       return;
 734
 735    /* The GL_ARB_direct_state_access specification says:
 736     *
 737     *   "An INVALID_ENUM error is generated if <pname> is not
 738     *    ELEMENT_ARRAY_BUFFER_BINDING."
 739     */
 740    if (pname != GL_ELEMENT_ARRAY_BUFFER_BINDING) {
 741       _mesa_error(ctx, GL_INVALID_ENUM,
 742                   "glGetVertexArrayiv(pname != "
 743                   "GL_ELEMENT_ARRAY_BUFFER_BINDING)");
 744       return;
 745    }
 746
 747    param[0] = vao->IndexBufferObj->Name;
 748 }