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 (at) 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 = BITFIELD_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_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 * Updates the derived gl_vertex_arrays when a gl_vertex_attrib_array 311 * or a gl_vertex_buffer_binding has changed. 312 */ 313 void 314 _mesa_update_vao_client_arrays(struct gl_context *ctx, 315 struct gl_vertex_array_object *vao) 316 { 317 GLbitfield arrays = vao->NewArrays; 318 319 while (arrays) { 320 const int attrib = u_bit_scan(&arrays); 321 struct gl_vertex_array *client_array = &vao->_VertexAttrib[attrib]; 322 const struct gl_array_attributes *attrib_array = 323 &vao->VertexAttrib[attrib]; 324 const struct gl_vertex_buffer_binding *buffer_binding = 325 &vao->BufferBinding[attrib_array->BufferBindingIndex]; 326 327 _mesa_update_client_array(ctx, client_array, attrib_array, 328 buffer_binding); 329 } 330 } 331 332 333 bool 334 _mesa_all_varyings_in_vbos(const struct gl_vertex_array_object *vao) 335 { 336 /* Walk those enabled arrays that have the default vbo attached */ 337 GLbitfield mask = vao->_Enabled & ~vao->VertexAttribBufferMask; 338 339 while (mask) { 340 /* Do not use u_bit_scan64 as we can walk multiple 341 * attrib arrays at once 342 */ 343 const int i = ffs(mask) - 1; 344 const struct gl_array_attributes *attrib_array = 345 &vao->VertexAttrib[i]; 346 const struct gl_vertex_buffer_binding *buffer_binding = 347 &vao->BufferBinding[attrib_array->BufferBindingIndex]; 348 349 /* Only enabled arrays shall appear in the _Enabled bitmask */ 350 assert(attrib_array->Enabled); 351 /* We have already masked out vao->VertexAttribBufferMask */ 352 assert(!_mesa_is_bufferobj(buffer_binding->BufferObj)); 353 354 /* Bail out once we find the first non vbo with a non zero stride */ 355 if (buffer_binding->Stride != 0) 356 return false; 357 358 /* Note that we cannot use the xor variant since the _BoundArray mask 359 * may contain array attributes that are bound but not enabled. 360 */ 361 mask &= ~buffer_binding->_BoundArrays; 362 } 363 364 return true; 365 } 366 367 bool 368 _mesa_all_buffers_are_unmapped(const struct gl_vertex_array_object *vao) 369 { 370 /* Walk the enabled arrays that have a vbo attached */ 371 GLbitfield mask = vao->_Enabled & vao->VertexAttribBufferMask; 372 373 while (mask) { 374 const int i = ffs(mask) - 1; 375 const struct gl_array_attributes *attrib_array = 376 &vao->VertexAttrib[i]; 377 const struct gl_vertex_buffer_binding *buffer_binding = 378 &vao->BufferBinding[attrib_array->BufferBindingIndex]; 379 380 /* Only enabled arrays shall appear in the _Enabled bitmask */ 381 assert(attrib_array->Enabled); 382 /* We have already masked with vao->VertexAttribBufferMask */ 383 assert(_mesa_is_bufferobj(buffer_binding->BufferObj)); 384 385 /* Bail out once we find the first disallowed mapping */ 386 if (_mesa_check_disallowed_mapping(buffer_binding->BufferObj)) 387 return false; 388 389 /* We have handled everything that is bound to this buffer_binding. */ 390 mask &= ~buffer_binding->_BoundArrays; 391 } 392 393 return true; 394 } 395 396 /**********************************************************************/ 397 /* API Functions */ 398 /**********************************************************************/ 399 400 401 /** 402 * ARB version of glBindVertexArray() 403 */ 404 static ALWAYS_INLINE void 405 bind_vertex_array(struct gl_context *ctx, GLuint id, bool no_error) 406 { 407 struct gl_vertex_array_object *const oldObj = ctx->Array.VAO; 408 struct gl_vertex_array_object *newObj = NULL; 409 410 assert(oldObj != NULL); 411 412 if (oldObj->Name == id) 413 return; /* rebinding the same array object- no change */ 414 415 /* 416 * Get pointer to new array object (newObj) 417 */ 418 if (id == 0) { 419 /* The spec says there is no array object named 0, but we use 420 * one internally because it simplifies things. 421 */ 422 newObj = ctx->Array.DefaultVAO; 423 } 424 else { 425 /* non-default array object */ 426 newObj = _mesa_lookup_vao(ctx, id); 427 if (!no_error && !newObj) { 428 _mesa_error(ctx, GL_INVALID_OPERATION, 429 "glBindVertexArray(non-gen name)"); 430 return; 431 } 432 433 newObj->EverBound = GL_TRUE; 434 } 435 436 if (ctx->Array.DrawMethod == DRAW_ARRAYS) { 437 /* The _DrawArrays pointer is pointing at the VAO being unbound and 438 * that VAO may be in the process of being deleted. If it's not going 439 * to be deleted, this will have no effect, because the pointer needs 440 * to be updated by the VBO module anyway. 441 * 442 * Before the VBO module can update the pointer, we have to set it 443 * to NULL for drivers not to set up arrays which are not bound, 444 * or to prevent a crash if the VAO being unbound is going to be 445 * deleted. 446 */ 447 ctx->Array._DrawArrays = NULL; 448 ctx->Array.DrawMethod = DRAW_NONE; 449 } 450 451 ctx->NewState |= _NEW_ARRAY; 452 _mesa_reference_vao(ctx, &ctx->Array.VAO, newObj); 453 } 454 455 456 void GLAPIENTRY 457 _mesa_BindVertexArray_no_error(GLuint id) 458 { 459 GET_CURRENT_CONTEXT(ctx); 460 bind_vertex_array(ctx, id, true); 461 } 462 463 464 void GLAPIENTRY 465 _mesa_BindVertexArray(GLuint id) 466 { 467 GET_CURRENT_CONTEXT(ctx); 468 bind_vertex_array(ctx, id, false); 469 } 470 471 472 /** 473 * Delete a set of array objects. 474 * 475 * \param n Number of array objects to delete. 476 * \param ids Array of \c n array object IDs. 477 */ 478 static void 479 delete_vertex_arrays(struct gl_context *ctx, GLsizei n, const GLuint *ids) 480 { 481 GLsizei i; 482 483 for (i = 0; i < n; i++) { 484 struct gl_vertex_array_object *obj = _mesa_lookup_vao(ctx, ids[i]); 485 486 if (obj) { 487 assert(obj->Name == ids[i]); 488 489 /* If the array object is currently bound, the spec says "the binding 490 * for that object reverts to zero and the default vertex array 491 * becomes current." 492 */ 493 if (obj == ctx->Array.VAO) 494 _mesa_BindVertexArray_no_error(0); 495 496 /* The ID is immediately freed for re-use */ 497 _mesa_HashRemoveLocked(ctx->Array.Objects, obj->Name); 498 499 if (ctx->Array.LastLookedUpVAO == obj) 500 _mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, NULL); 501 502 /* Unreference the array object. 503 * If refcount hits zero, the object will be deleted. 504 */ 505 _mesa_reference_vao(ctx, &obj, NULL); 506 } 507 } 508 } 509 510 511 void GLAPIENTRY 512 _mesa_DeleteVertexArrays_no_error(GLsizei n, const GLuint *ids) 513 { 514 GET_CURRENT_CONTEXT(ctx); 515 delete_vertex_arrays(ctx, n, ids); 516 } 517 518 519 void GLAPIENTRY 520 _mesa_DeleteVertexArrays(GLsizei n, const GLuint *ids) 521 { 522 GET_CURRENT_CONTEXT(ctx); 523 524 if (n < 0) { 525 _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteVertexArray(n)"); 526 return; 527 } 528 529 delete_vertex_arrays(ctx, n, ids); 530 } 531 532 533 /** 534 * Generate a set of unique array object IDs and store them in \c arrays. 535 * Helper for _mesa_GenVertexArrays() and _mesa_CreateVertexArrays() 536 * below. 537 * 538 * \param n Number of IDs to generate. 539 * \param arrays Array of \c n locations to store the IDs. 540 * \param create Indicates that the objects should also be created. 541 * \param func The name of the GL entry point. 542 */ 543 static void 544 gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays, 545 bool create, const char *func) 546 { 547 GLuint first; 548 GLint i; 549 550 if (!arrays) 551 return; 552 553 first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n); 554 555 /* For the sake of simplicity we create the array objects in both 556 * the Gen* and Create* cases. The only difference is the value of 557 * EverBound, which is set to true in the Create* case. 558 */ 559 for (i = 0; i < n; i++) { 560 struct gl_vertex_array_object *obj; 561 GLuint name = first + i; 562 563 obj = _mesa_new_vao(ctx, name); 564 if (!obj) { 565 _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func); 566 return; 567 } 568 obj->EverBound = create; 569 _mesa_HashInsertLocked(ctx->Array.Objects, obj->Name, obj); 570 arrays[i] = first + i; 571 } 572 } 573 574 575 static void 576 gen_vertex_arrays_err(struct gl_context *ctx, GLsizei n, GLuint *arrays, 577 bool create, const char *func) 578 { 579 if (n < 0) { 580 _mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func); 581 return; 582 } 583 584 gen_vertex_arrays(ctx, n, arrays, create, func); 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_no_error(GLsizei n, GLuint *arrays) 594 { 595 GET_CURRENT_CONTEXT(ctx); 596 gen_vertex_arrays(ctx, n, arrays, false, "glGenVertexArrays"); 597 } 598 599 600 void GLAPIENTRY 601 _mesa_GenVertexArrays(GLsizei n, GLuint *arrays) 602 { 603 GET_CURRENT_CONTEXT(ctx); 604 gen_vertex_arrays_err(ctx, n, arrays, false, "glGenVertexArrays"); 605 } 606 607 608 /** 609 * ARB_direct_state_access 610 * Generates ID's and creates the array objects. 611 */ 612 void GLAPIENTRY 613 _mesa_CreateVertexArrays_no_error(GLsizei n, GLuint *arrays) 614 { 615 GET_CURRENT_CONTEXT(ctx); 616 gen_vertex_arrays(ctx, n, arrays, true, "glCreateVertexArrays"); 617 } 618 619 620 void GLAPIENTRY 621 _mesa_CreateVertexArrays(GLsizei n, GLuint *arrays) 622 { 623 GET_CURRENT_CONTEXT(ctx); 624 gen_vertex_arrays_err(ctx, n, arrays, true, "glCreateVertexArrays"); 625 } 626 627 628 /** 629 * Determine if ID is the name of an array object. 630 * 631 * \param id ID of the potential array object. 632 * \return \c GL_TRUE if \c id is the name of a array object, 633 * \c GL_FALSE otherwise. 634 */ 635 GLboolean GLAPIENTRY 636 _mesa_IsVertexArray( GLuint id ) 637 { 638 struct gl_vertex_array_object * obj; 639 GET_CURRENT_CONTEXT(ctx); 640 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); 641 642 obj = _mesa_lookup_vao(ctx, id); 643 644 return obj != NULL && obj->EverBound; 645 } 646 647 648 /** 649 * Sets the element array buffer binding of a vertex array object. 650 * 651 * This is the ARB_direct_state_access equivalent of 652 * glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer). 653 */ 654 static ALWAYS_INLINE void 655 vertex_array_element_buffer(struct gl_context *ctx, GLuint vaobj, GLuint buffer, 656 bool no_error) 657 { 658 struct gl_vertex_array_object *vao; 659 struct gl_buffer_object *bufObj; 660 661 ASSERT_OUTSIDE_BEGIN_END(ctx); 662 663 if (!no_error) { 664 /* The GL_ARB_direct_state_access specification says: 665 * 666 * "An INVALID_OPERATION error is generated by 667 * VertexArrayElementBuffer if <vaobj> is not [compatibility profile: 668 * zero or] the name of an existing vertex array object." 669 */ 670 vao =_mesa_lookup_vao_err(ctx, vaobj, "glVertexArrayElementBuffer"); 671 if (!vao) 672 return; 673 } else { 674 vao = _mesa_lookup_vao(ctx, vaobj); 675 } 676 677 if (buffer != 0) { 678 if (!no_error) { 679 /* The GL_ARB_direct_state_access specification says: 680 * 681 * "An INVALID_OPERATION error is generated if <buffer> is not zero 682 * or the name of an existing buffer object." 683 */ 684 bufObj = _mesa_lookup_bufferobj_err(ctx, buffer, 685 "glVertexArrayElementBuffer"); 686 } else { 687 bufObj = _mesa_lookup_bufferobj(ctx, buffer); 688 } 689 } else { 690 bufObj = ctx->Shared->NullBufferObj; 691 } 692 693 if (bufObj) 694 _mesa_reference_buffer_object(ctx, &vao->IndexBufferObj, bufObj); 695 } 696 697 698 void GLAPIENTRY 699 _mesa_VertexArrayElementBuffer_no_error(GLuint vaobj, GLuint buffer) 700 { 701 GET_CURRENT_CONTEXT(ctx); 702 vertex_array_element_buffer(ctx, vaobj, buffer, true); 703 } 704 705 706 void GLAPIENTRY 707 _mesa_VertexArrayElementBuffer(GLuint vaobj, GLuint buffer) 708 { 709 GET_CURRENT_CONTEXT(ctx); 710 vertex_array_element_buffer(ctx, vaobj, buffer, false); 711 } 712 713 714 void GLAPIENTRY 715 _mesa_GetVertexArrayiv(GLuint vaobj, GLenum pname, GLint *param) 716 { 717 GET_CURRENT_CONTEXT(ctx); 718 struct gl_vertex_array_object *vao; 719 720 ASSERT_OUTSIDE_BEGIN_END(ctx); 721 722 /* The GL_ARB_direct_state_access specification says: 723 * 724 * "An INVALID_OPERATION error is generated if <vaobj> is not 725 * [compatibility profile: zero or] the name of an existing 726 * vertex array object." 727 */ 728 vao =_mesa_lookup_vao_err(ctx, vaobj, "glGetVertexArrayiv"); 729 if (!vao) 730 return; 731 732 /* The GL_ARB_direct_state_access specification says: 733 * 734 * "An INVALID_ENUM error is generated if <pname> is not 735 * ELEMENT_ARRAY_BUFFER_BINDING." 736 */ 737 if (pname != GL_ELEMENT_ARRAY_BUFFER_BINDING) { 738 _mesa_error(ctx, GL_INVALID_ENUM, 739 "glGetVertexArrayiv(pname != " 740 "GL_ELEMENT_ARRAY_BUFFER_BINDING)"); 741 return; 742 } 743 744 param[0] = vao->IndexBufferObj->Name; 745 } 746