2 * Mesa 3-D graphics library
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.
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:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
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.
31 * Implementation of Vertex Array Objects (VAOs), from OpenGL 3.1+ /
32 * the GL_ARB_vertex_array_object extension.
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.
38 * \author Ian Romanick <idr@us.ibm.com>
48 #include "bufferobj.h"
54 #include "util/bitscan.h"
55 #include "util/u_atomic.h"
59 _mesa_vao_attribute_map
[ATTRIBUTE_MAP_MODE_MAX
][VERT_ATTRIB_MAX
] =
61 /* ATTRIBUTE_MAP_MODE_IDENTITY
63 * Grab vertex processing attribute VERT_ATTRIB_POS from
64 * the VAO attribute VERT_ATTRIB_POS, and grab vertex processing
65 * attribute VERT_ATTRIB_GENERIC0 from the VAO attribute
66 * VERT_ATTRIB_GENERIC0.
69 VERT_ATTRIB_POS
, /* VERT_ATTRIB_POS */
70 VERT_ATTRIB_NORMAL
, /* VERT_ATTRIB_NORMAL */
71 VERT_ATTRIB_COLOR0
, /* VERT_ATTRIB_COLOR0 */
72 VERT_ATTRIB_COLOR1
, /* VERT_ATTRIB_COLOR1 */
73 VERT_ATTRIB_FOG
, /* VERT_ATTRIB_FOG */
74 VERT_ATTRIB_COLOR_INDEX
, /* VERT_ATTRIB_COLOR_INDEX */
75 VERT_ATTRIB_EDGEFLAG
, /* VERT_ATTRIB_EDGEFLAG */
76 VERT_ATTRIB_TEX0
, /* VERT_ATTRIB_TEX0 */
77 VERT_ATTRIB_TEX1
, /* VERT_ATTRIB_TEX1 */
78 VERT_ATTRIB_TEX2
, /* VERT_ATTRIB_TEX2 */
79 VERT_ATTRIB_TEX3
, /* VERT_ATTRIB_TEX3 */
80 VERT_ATTRIB_TEX4
, /* VERT_ATTRIB_TEX4 */
81 VERT_ATTRIB_TEX5
, /* VERT_ATTRIB_TEX5 */
82 VERT_ATTRIB_TEX6
, /* VERT_ATTRIB_TEX6 */
83 VERT_ATTRIB_TEX7
, /* VERT_ATTRIB_TEX7 */
84 VERT_ATTRIB_POINT_SIZE
, /* VERT_ATTRIB_POINT_SIZE */
85 VERT_ATTRIB_GENERIC0
, /* VERT_ATTRIB_GENERIC0 */
86 VERT_ATTRIB_GENERIC1
, /* VERT_ATTRIB_GENERIC1 */
87 VERT_ATTRIB_GENERIC2
, /* VERT_ATTRIB_GENERIC2 */
88 VERT_ATTRIB_GENERIC3
, /* VERT_ATTRIB_GENERIC3 */
89 VERT_ATTRIB_GENERIC4
, /* VERT_ATTRIB_GENERIC4 */
90 VERT_ATTRIB_GENERIC5
, /* VERT_ATTRIB_GENERIC5 */
91 VERT_ATTRIB_GENERIC6
, /* VERT_ATTRIB_GENERIC6 */
92 VERT_ATTRIB_GENERIC7
, /* VERT_ATTRIB_GENERIC7 */
93 VERT_ATTRIB_GENERIC8
, /* VERT_ATTRIB_GENERIC8 */
94 VERT_ATTRIB_GENERIC9
, /* VERT_ATTRIB_GENERIC9 */
95 VERT_ATTRIB_GENERIC10
, /* VERT_ATTRIB_GENERIC10 */
96 VERT_ATTRIB_GENERIC11
, /* VERT_ATTRIB_GENERIC11 */
97 VERT_ATTRIB_GENERIC12
, /* VERT_ATTRIB_GENERIC12 */
98 VERT_ATTRIB_GENERIC13
, /* VERT_ATTRIB_GENERIC13 */
99 VERT_ATTRIB_GENERIC14
, /* VERT_ATTRIB_GENERIC14 */
100 VERT_ATTRIB_GENERIC15
/* VERT_ATTRIB_GENERIC15 */
103 /* ATTRIBUTE_MAP_MODE_POSITION
105 * Grab vertex processing attribute VERT_ATTRIB_POS as well as
106 * vertex processing attribute VERT_ATTRIB_GENERIC0 from the
107 * VAO attribute VERT_ATTRIB_POS.
110 VERT_ATTRIB_POS
, /* VERT_ATTRIB_POS */
111 VERT_ATTRIB_NORMAL
, /* VERT_ATTRIB_NORMAL */
112 VERT_ATTRIB_COLOR0
, /* VERT_ATTRIB_COLOR0 */
113 VERT_ATTRIB_COLOR1
, /* VERT_ATTRIB_COLOR1 */
114 VERT_ATTRIB_FOG
, /* VERT_ATTRIB_FOG */
115 VERT_ATTRIB_COLOR_INDEX
, /* VERT_ATTRIB_COLOR_INDEX */
116 VERT_ATTRIB_EDGEFLAG
, /* VERT_ATTRIB_EDGEFLAG */
117 VERT_ATTRIB_TEX0
, /* VERT_ATTRIB_TEX0 */
118 VERT_ATTRIB_TEX1
, /* VERT_ATTRIB_TEX1 */
119 VERT_ATTRIB_TEX2
, /* VERT_ATTRIB_TEX2 */
120 VERT_ATTRIB_TEX3
, /* VERT_ATTRIB_TEX3 */
121 VERT_ATTRIB_TEX4
, /* VERT_ATTRIB_TEX4 */
122 VERT_ATTRIB_TEX5
, /* VERT_ATTRIB_TEX5 */
123 VERT_ATTRIB_TEX6
, /* VERT_ATTRIB_TEX6 */
124 VERT_ATTRIB_TEX7
, /* VERT_ATTRIB_TEX7 */
125 VERT_ATTRIB_POINT_SIZE
, /* VERT_ATTRIB_POINT_SIZE */
126 VERT_ATTRIB_POS
, /* VERT_ATTRIB_GENERIC0 */
127 VERT_ATTRIB_GENERIC1
, /* VERT_ATTRIB_GENERIC1 */
128 VERT_ATTRIB_GENERIC2
, /* VERT_ATTRIB_GENERIC2 */
129 VERT_ATTRIB_GENERIC3
, /* VERT_ATTRIB_GENERIC3 */
130 VERT_ATTRIB_GENERIC4
, /* VERT_ATTRIB_GENERIC4 */
131 VERT_ATTRIB_GENERIC5
, /* VERT_ATTRIB_GENERIC5 */
132 VERT_ATTRIB_GENERIC6
, /* VERT_ATTRIB_GENERIC6 */
133 VERT_ATTRIB_GENERIC7
, /* VERT_ATTRIB_GENERIC7 */
134 VERT_ATTRIB_GENERIC8
, /* VERT_ATTRIB_GENERIC8 */
135 VERT_ATTRIB_GENERIC9
, /* VERT_ATTRIB_GENERIC9 */
136 VERT_ATTRIB_GENERIC10
, /* VERT_ATTRIB_GENERIC10 */
137 VERT_ATTRIB_GENERIC11
, /* VERT_ATTRIB_GENERIC11 */
138 VERT_ATTRIB_GENERIC12
, /* VERT_ATTRIB_GENERIC12 */
139 VERT_ATTRIB_GENERIC13
, /* VERT_ATTRIB_GENERIC13 */
140 VERT_ATTRIB_GENERIC14
, /* VERT_ATTRIB_GENERIC14 */
141 VERT_ATTRIB_GENERIC15
/* VERT_ATTRIB_GENERIC15 */
144 /* ATTRIBUTE_MAP_MODE_GENERIC0
146 * Grab vertex processing attribute VERT_ATTRIB_POS as well as
147 * vertex processing attribute VERT_ATTRIB_GENERIC0 from the
148 * VAO attribute VERT_ATTRIB_GENERIC0.
151 VERT_ATTRIB_GENERIC0
, /* VERT_ATTRIB_POS */
152 VERT_ATTRIB_NORMAL
, /* VERT_ATTRIB_NORMAL */
153 VERT_ATTRIB_COLOR0
, /* VERT_ATTRIB_COLOR0 */
154 VERT_ATTRIB_COLOR1
, /* VERT_ATTRIB_COLOR1 */
155 VERT_ATTRIB_FOG
, /* VERT_ATTRIB_FOG */
156 VERT_ATTRIB_COLOR_INDEX
, /* VERT_ATTRIB_COLOR_INDEX */
157 VERT_ATTRIB_EDGEFLAG
, /* VERT_ATTRIB_EDGEFLAG */
158 VERT_ATTRIB_TEX0
, /* VERT_ATTRIB_TEX0 */
159 VERT_ATTRIB_TEX1
, /* VERT_ATTRIB_TEX1 */
160 VERT_ATTRIB_TEX2
, /* VERT_ATTRIB_TEX2 */
161 VERT_ATTRIB_TEX3
, /* VERT_ATTRIB_TEX3 */
162 VERT_ATTRIB_TEX4
, /* VERT_ATTRIB_TEX4 */
163 VERT_ATTRIB_TEX5
, /* VERT_ATTRIB_TEX5 */
164 VERT_ATTRIB_TEX6
, /* VERT_ATTRIB_TEX6 */
165 VERT_ATTRIB_TEX7
, /* VERT_ATTRIB_TEX7 */
166 VERT_ATTRIB_POINT_SIZE
, /* VERT_ATTRIB_POINT_SIZE */
167 VERT_ATTRIB_GENERIC0
, /* VERT_ATTRIB_GENERIC0 */
168 VERT_ATTRIB_GENERIC1
, /* VERT_ATTRIB_GENERIC1 */
169 VERT_ATTRIB_GENERIC2
, /* VERT_ATTRIB_GENERIC2 */
170 VERT_ATTRIB_GENERIC3
, /* VERT_ATTRIB_GENERIC3 */
171 VERT_ATTRIB_GENERIC4
, /* VERT_ATTRIB_GENERIC4 */
172 VERT_ATTRIB_GENERIC5
, /* VERT_ATTRIB_GENERIC5 */
173 VERT_ATTRIB_GENERIC6
, /* VERT_ATTRIB_GENERIC6 */
174 VERT_ATTRIB_GENERIC7
, /* VERT_ATTRIB_GENERIC7 */
175 VERT_ATTRIB_GENERIC8
, /* VERT_ATTRIB_GENERIC8 */
176 VERT_ATTRIB_GENERIC9
, /* VERT_ATTRIB_GENERIC9 */
177 VERT_ATTRIB_GENERIC10
, /* VERT_ATTRIB_GENERIC10 */
178 VERT_ATTRIB_GENERIC11
, /* VERT_ATTRIB_GENERIC11 */
179 VERT_ATTRIB_GENERIC12
, /* VERT_ATTRIB_GENERIC12 */
180 VERT_ATTRIB_GENERIC13
, /* VERT_ATTRIB_GENERIC13 */
181 VERT_ATTRIB_GENERIC14
, /* VERT_ATTRIB_GENERIC14 */
182 VERT_ATTRIB_GENERIC15
/* VERT_ATTRIB_GENERIC15 */
188 * Look up the array object for the given ID.
191 * Either a pointer to the array object with the specified ID or \c NULL for
192 * a non-existent ID. The spec defines ID 0 as being technically
196 struct gl_vertex_array_object
*
197 _mesa_lookup_vao(struct gl_context
*ctx
, GLuint id
)
202 struct gl_vertex_array_object
*vao
;
204 if (ctx
->Array
.LastLookedUpVAO
&&
205 ctx
->Array
.LastLookedUpVAO
->Name
== id
) {
206 vao
= ctx
->Array
.LastLookedUpVAO
;
208 vao
= (struct gl_vertex_array_object
*)
209 _mesa_HashLookupLocked(ctx
->Array
.Objects
, id
);
211 _mesa_reference_vao(ctx
, &ctx
->Array
.LastLookedUpVAO
, vao
);
220 * Looks up the array object for the given ID.
222 * Unlike _mesa_lookup_vao, this function generates a GL_INVALID_OPERATION
223 * error if the array object does not exist. It also returns the default
224 * array object when ctx is a compatibility profile context and id is zero.
226 struct gl_vertex_array_object
*
227 _mesa_lookup_vao_err(struct gl_context
*ctx
, GLuint id
, const char *caller
)
229 /* The ARB_direct_state_access specification says:
231 * "<vaobj> is [compatibility profile:
232 * zero, indicating the default vertex array object, or]
233 * the name of the vertex array object."
236 if (ctx
->API
== API_OPENGL_CORE
) {
237 _mesa_error(ctx
, GL_INVALID_OPERATION
,
238 "%s(zero is not valid vaobj name in a core profile "
243 return ctx
->Array
.DefaultVAO
;
245 struct gl_vertex_array_object
*vao
;
247 if (ctx
->Array
.LastLookedUpVAO
&&
248 ctx
->Array
.LastLookedUpVAO
->Name
== id
) {
249 vao
= ctx
->Array
.LastLookedUpVAO
;
251 vao
= (struct gl_vertex_array_object
*)
252 _mesa_HashLookupLocked(ctx
->Array
.Objects
, id
);
254 /* The ARB_direct_state_access specification says:
256 * "An INVALID_OPERATION error is generated if <vaobj> is not
257 * [compatibility profile: zero or] the name of an existing
258 * vertex array object."
260 if (!vao
|| !vao
->EverBound
) {
261 _mesa_error(ctx
, GL_INVALID_OPERATION
,
262 "%s(non-existent vaobj=%u)", caller
, id
);
266 _mesa_reference_vao(ctx
, &ctx
->Array
.LastLookedUpVAO
, vao
);
275 * For all the vertex binding points in the array object, unbind any pointers
276 * to any buffer objects (VBOs).
277 * This is done just prior to array object destruction.
280 unbind_array_object_vbos(struct gl_context
*ctx
, struct gl_vertex_array_object
*obj
)
284 for (i
= 0; i
< ARRAY_SIZE(obj
->BufferBinding
); i
++)
285 _mesa_reference_buffer_object(ctx
, &obj
->BufferBinding
[i
].BufferObj
, NULL
);
290 * Allocate and initialize a new vertex array object.
292 struct gl_vertex_array_object
*
293 _mesa_new_vao(struct gl_context
*ctx
, GLuint name
)
295 struct gl_vertex_array_object
*obj
= CALLOC_STRUCT(gl_vertex_array_object
);
297 _mesa_initialize_vao(ctx
, obj
, name
);
303 * Delete an array object.
306 _mesa_delete_vao(struct gl_context
*ctx
, struct gl_vertex_array_object
*obj
)
308 unbind_array_object_vbos(ctx
, obj
);
309 _mesa_reference_buffer_object(ctx
, &obj
->IndexBufferObj
, NULL
);
316 * Set ptr to vao w/ reference counting.
317 * Note: this should only be called from the _mesa_reference_vao()
321 _mesa_reference_vao_(struct gl_context
*ctx
,
322 struct gl_vertex_array_object
**ptr
,
323 struct gl_vertex_array_object
*vao
)
328 /* Unreference the old array object */
329 struct gl_vertex_array_object
*oldObj
= *ptr
;
332 if (oldObj
->SharedAndImmutable
) {
333 deleteFlag
= p_atomic_dec_zero(&oldObj
->RefCount
);
335 assert(oldObj
->RefCount
> 0);
337 deleteFlag
= (oldObj
->RefCount
== 0);
341 _mesa_delete_vao(ctx
, oldObj
);
348 /* reference new array object */
349 if (vao
->SharedAndImmutable
) {
350 p_atomic_inc(&vao
->RefCount
);
352 assert(vao
->RefCount
> 0);
362 * Initialize attributes of a vertex array within a vertex array object.
363 * \param vao the container vertex array object
364 * \param index which array in the VAO to initialize
365 * \param size number of components (1, 2, 3 or 4) per attribute
366 * \param type datatype of the attribute (GL_FLOAT, GL_INT, etc).
369 init_array(struct gl_context
*ctx
,
370 struct gl_vertex_array_object
*vao
,
371 gl_vert_attrib index
, GLint size
, GLint type
)
373 assert(index
< ARRAY_SIZE(vao
->VertexAttrib
));
374 struct gl_array_attributes
*array
= &vao
->VertexAttrib
[index
];
375 assert(index
< ARRAY_SIZE(vao
->BufferBinding
));
376 struct gl_vertex_buffer_binding
*binding
= &vao
->BufferBinding
[index
];
380 array
->Format
= GL_RGBA
; /* only significant for GL_EXT_vertex_array_bgra */
383 array
->RelativeOffset
= 0;
384 array
->Enabled
= GL_FALSE
;
385 array
->Normalized
= GL_FALSE
;
386 array
->Integer
= GL_FALSE
;
387 array
->Doubles
= GL_FALSE
;
388 array
->_ElementSize
= size
* _mesa_sizeof_type(type
);
389 ASSERT_BITFIELD_SIZE(struct gl_array_attributes
, BufferBindingIndex
,
390 VERT_ATTRIB_MAX
- 1);
391 array
->BufferBindingIndex
= index
;
394 binding
->Stride
= array
->_ElementSize
;
395 binding
->BufferObj
= NULL
;
396 binding
->_BoundArrays
= BITFIELD_BIT(index
);
398 /* Vertex array buffers */
399 _mesa_reference_buffer_object(ctx
, &binding
->BufferObj
,
400 ctx
->Shared
->NullBufferObj
);
405 * Initialize a gl_vertex_array_object's arrays.
408 _mesa_initialize_vao(struct gl_context
*ctx
,
409 struct gl_vertex_array_object
*vao
,
417 vao
->SharedAndImmutable
= false;
419 /* Init the individual arrays */
420 for (i
= 0; i
< ARRAY_SIZE(vao
->VertexAttrib
); i
++) {
422 case VERT_ATTRIB_NORMAL
:
423 init_array(ctx
, vao
, VERT_ATTRIB_NORMAL
, 3, GL_FLOAT
);
425 case VERT_ATTRIB_COLOR1
:
426 init_array(ctx
, vao
, VERT_ATTRIB_COLOR1
, 3, GL_FLOAT
);
428 case VERT_ATTRIB_FOG
:
429 init_array(ctx
, vao
, VERT_ATTRIB_FOG
, 1, GL_FLOAT
);
431 case VERT_ATTRIB_COLOR_INDEX
:
432 init_array(ctx
, vao
, VERT_ATTRIB_COLOR_INDEX
, 1, GL_FLOAT
);
434 case VERT_ATTRIB_EDGEFLAG
:
435 init_array(ctx
, vao
, VERT_ATTRIB_EDGEFLAG
, 1, GL_BOOL
);
437 case VERT_ATTRIB_POINT_SIZE
:
438 init_array(ctx
, vao
, VERT_ATTRIB_POINT_SIZE
, 1, GL_FLOAT
);
441 init_array(ctx
, vao
, i
, 4, GL_FLOAT
);
446 vao
->_AttributeMapMode
= ATTRIBUTE_MAP_MODE_IDENTITY
;
448 _mesa_reference_buffer_object(ctx
, &vao
->IndexBufferObj
,
449 ctx
->Shared
->NullBufferObj
);
454 * Compute the offset range for the provided binding.
456 * This is a helper function for the below.
459 compute_vbo_offset_range(const struct gl_vertex_array_object
*vao
,
460 const struct gl_vertex_buffer_binding
*binding
,
461 GLsizeiptr
* min
, GLsizeiptr
* max
)
463 /* The function is meant to work on VBO bindings */
464 assert(_mesa_is_bufferobj(binding
->BufferObj
));
466 /* Start with an inverted range of relative offsets. */
467 GLuint min_offset
= ~(GLuint
)0;
468 GLuint max_offset
= 0;
470 /* We work on the unmapped originaly VAO array entries. */
471 GLbitfield mask
= vao
->_Enabled
& binding
->_BoundArrays
;
472 /* The binding should be active somehow, not to return inverted ranges */
475 const int i
= u_bit_scan(&mask
);
476 const GLuint off
= vao
->VertexAttrib
[i
].RelativeOffset
;
477 min_offset
= MIN2(off
, min_offset
);
478 max_offset
= MAX2(off
, max_offset
);
481 *min
= binding
->Offset
+ (GLsizeiptr
)min_offset
;
482 *max
= binding
->Offset
+ (GLsizeiptr
)max_offset
;
487 * Update the unique binding and pos/generic0 map tracking in the vao.
489 * The idea is to build up information in the vao so that a consuming
490 * backend can execute the following to set up buffer and vertex element
493 * const GLbitfield inputs_read = VERT_BIT_ALL; // backend vp inputs
495 * // Attribute data is in a VBO.
496 * GLbitfield vbomask = inputs_read & _mesa_draw_vbo_array_bits(ctx);
498 * // The attribute index to start pulling a binding
499 * const gl_vert_attrib i = ffs(vbomask) - 1;
500 * const struct gl_vertex_buffer_binding *const binding
501 * = _mesa_draw_buffer_binding(vao, i);
503 * <insert code to handle the vertex buffer object at binding>
505 * const GLbitfield boundmask = _mesa_draw_bound_attrib_bits(binding);
506 * GLbitfield attrmask = vbomask & boundmask;
508 * // Walk attributes belonging to the binding
510 * const gl_vert_attrib attr = u_bit_scan(&attrmask);
511 * const struct gl_array_attributes *const attrib
512 * = _mesa_draw_array_attrib(vao, attr);
514 * <insert code to handle the vertex element refering to the binding>
516 * vbomask &= ~boundmask;
519 * // Process user space buffers
520 * GLbitfield usermask = inputs_read & _mesa_draw_user_array_bits(ctx);
522 * // The attribute index to start pulling a binding
523 * const gl_vert_attrib i = ffs(usermask) - 1;
524 * const struct gl_vertex_buffer_binding *const binding
525 * = _mesa_draw_buffer_binding(vao, i);
527 * <insert code to handle a set of interleaved user space arrays at binding>
529 * const GLbitfield boundmask = _mesa_draw_bound_attrib_bits(binding);
530 * GLbitfield attrmask = usermask & boundmask;
532 * // Walk interleaved attributes with a common stride and instance divisor
534 * const gl_vert_attrib attr = u_bit_scan(&attrmask);
535 * const struct gl_array_attributes *const attrib
536 * = _mesa_draw_array_attrib(vao, attr);
538 * <insert code to handle non vbo vertex arrays>
540 * usermask &= ~boundmask;
543 * // Process values that should have better been uniforms in the application
544 * GLbitfield curmask = inputs_read & _mesa_draw_current_bits(ctx);
546 * const gl_vert_attrib attr = u_bit_scan(&curmask);
547 * const struct gl_array_attributes *const attrib
548 * = _mesa_draw_current_attrib(ctx, attr);
550 * <insert code to handle current values>
554 * Note that the scan below must not incoporate any context state.
555 * The rationale is that once a VAO is finalized it should not
556 * be touched anymore. That means, do not incorporate the
557 * gl_context::Array._DrawVAOEnabledAttribs bitmask into this scan.
558 * A backend driver may further reduce the handled vertex processing
559 * inputs based on their vertex shader inputs. But scanning for
560 * collapsable binding points to reduce relocs is done based on the
562 * Also VAOs may be shared between contexts due to their use in dlists
563 * thus no context state should bleed into the VAO.
566 _mesa_update_vao_derived_arrays(struct gl_context
*ctx
,
567 struct gl_vertex_array_object
*vao
)
569 /* Make sure we do not run into problems with shared objects */
570 assert(!vao
->SharedAndImmutable
|| vao
->NewArrays
== 0);
572 /* Limit used for common binding scanning below. */
573 const GLsizeiptr MaxRelativeOffset
=
574 ctx
->Const
.MaxVertexAttribRelativeOffset
;
576 /* The gl_vertex_array_object::_AttributeMapMode denotes the way
577 * VERT_ATTRIB_{POS,GENERIC0} mapping is done.
579 * This mapping is used to map between the OpenGL api visible
580 * VERT_ATTRIB_* arrays to mesa driver arrayinputs or shader inputs.
581 * The mapping only depends on the enabled bits of the
582 * VERT_ATTRIB_{POS,GENERIC0} arrays and is tracked in the VAO.
584 * This map needs to be applied when finally translating to the bitmasks
585 * as consumed by the driver backends. The duplicate scanning is here
586 * can as well be done in the OpenGL API numbering without this map.
588 const gl_attribute_map_mode mode
= vao
->_AttributeMapMode
;
589 /* Enabled array bits. */
590 const GLbitfield enabled
= vao
->_Enabled
;
591 /* VBO array bits. */
592 const GLbitfield vbos
= vao
->VertexAttribBufferMask
;
594 /* Compute and store effectively enabled and mapped vbo arrays */
595 vao
->_EffEnabledVBO
= _mesa_vao_enable_to_vp_inputs(mode
, enabled
& vbos
);
596 /* Walk those enabled arrays that have a real vbo attached */
597 GLbitfield mask
= enabled
;
599 /* Do not use u_bit_scan as we can walk multiple attrib arrays at once */
600 const int i
= ffs(mask
) - 1;
601 /* The binding from the first to be processed attribute. */
602 const GLuint bindex
= vao
->VertexAttrib
[i
].BufferBindingIndex
;
603 struct gl_vertex_buffer_binding
*binding
= &vao
->BufferBinding
[bindex
];
605 /* The scan goes different for user space arrays than vbos */
606 if (_mesa_is_bufferobj(binding
->BufferObj
)) {
607 /* The bound arrays. */
608 const GLbitfield bound
= enabled
& binding
->_BoundArrays
;
610 /* Start this current effective binding with the actual bound arrays */
611 GLbitfield eff_bound_arrays
= bound
;
614 * If there is nothing left to scan just update the effective binding
615 * information. If the VAO is already only using a single binding point
616 * we end up here. So the overhead of this scan for an application
617 * carefully preparing the VAO for draw is low.
620 GLbitfield scanmask
= mask
& vbos
& ~bound
;
621 /* Is there something left to scan? */
623 /* Just update the back reference from the attrib to the binding and
624 * the effective offset.
626 GLbitfield attrmask
= eff_bound_arrays
;
628 const int j
= u_bit_scan(&attrmask
);
629 struct gl_array_attributes
*attrib2
= &vao
->VertexAttrib
[j
];
631 /* Update the index into the common binding point and offset */
632 attrib2
->_EffBufferBindingIndex
= bindex
;
633 attrib2
->_EffRelativeOffset
= attrib2
->RelativeOffset
;
634 assert(attrib2
->_EffRelativeOffset
<= MaxRelativeOffset
);
636 /* Only enabled arrays shall appear in the unique bindings */
637 assert(attrib2
->Enabled
);
639 /* Finally this is the set of effectively bound arrays with the
640 * original binding offset.
642 binding
->_EffOffset
= binding
->Offset
;
643 /* The bound arrays past the VERT_ATTRIB_{POS,GENERIC0} mapping. */
644 binding
->_EffBoundArrays
=
645 _mesa_vao_enable_to_vp_inputs(mode
, eff_bound_arrays
);
648 /* In the VBO case, scan for attribute/binding
649 * combinations with relative bindings in the range of
650 * [0, ctx->Const.MaxVertexAttribRelativeOffset].
651 * Note that this does also go beyond just interleaved arrays
652 * as long as they use the same VBO, binding parameters and the
653 * offsets stay within bounds that the backend still can handle.
656 GLsizeiptr min_offset
, max_offset
;
657 compute_vbo_offset_range(vao
, binding
, &min_offset
, &max_offset
);
658 assert(max_offset
<= min_offset
+ MaxRelativeOffset
);
662 /* Do not use u_bit_scan as we can walk multiple
663 * attrib arrays at once
665 const int j
= ffs(scanmask
) - 1;
666 const struct gl_array_attributes
*attrib2
=
667 &vao
->VertexAttrib
[j
];
668 const struct gl_vertex_buffer_binding
*binding2
=
669 &vao
->BufferBinding
[attrib2
->BufferBindingIndex
];
671 /* Remove those attrib bits from the mask that are bound to the
672 * same effective binding point.
674 const GLbitfield bound2
= enabled
& binding2
->_BoundArrays
;
677 /* Check if we have an identical binding */
678 if (binding
->Stride
!= binding2
->Stride
)
680 if (binding
->InstanceDivisor
!= binding2
->InstanceDivisor
)
682 if (binding
->BufferObj
!= binding2
->BufferObj
)
684 /* Check if we can fold both bindings into a common binding */
685 GLsizeiptr min_offset2
, max_offset2
;
686 compute_vbo_offset_range(vao
, binding2
,
687 &min_offset2
, &max_offset2
);
688 /* If the relative offset is within the limits ... */
689 if (min_offset
+ MaxRelativeOffset
< max_offset2
)
691 if (min_offset2
+ MaxRelativeOffset
< max_offset
)
693 /* ... add this array to the effective binding */
694 eff_bound_arrays
|= bound2
;
695 min_offset
= MIN2(min_offset
, min_offset2
);
696 max_offset
= MAX2(max_offset
, max_offset2
);
697 assert(max_offset
<= min_offset
+ MaxRelativeOffset
);
700 /* Update the back reference from the attrib to the binding */
701 GLbitfield attrmask
= eff_bound_arrays
;
703 const int j
= u_bit_scan(&attrmask
);
704 struct gl_array_attributes
*attrib2
= &vao
->VertexAttrib
[j
];
705 const struct gl_vertex_buffer_binding
*binding2
=
706 &vao
->BufferBinding
[attrib2
->BufferBindingIndex
];
708 /* Update the index into the common binding point and offset */
709 attrib2
->_EffBufferBindingIndex
= bindex
;
710 attrib2
->_EffRelativeOffset
=
711 binding2
->Offset
+ attrib2
->RelativeOffset
- min_offset
;
712 assert(attrib2
->_EffRelativeOffset
<= MaxRelativeOffset
);
714 /* Only enabled arrays shall appear in the unique bindings */
715 assert(attrib2
->Enabled
);
717 /* Finally this is the set of effectively bound arrays */
718 binding
->_EffOffset
= min_offset
;
719 /* The bound arrays past the VERT_ATTRIB_{POS,GENERIC0} mapping. */
720 binding
->_EffBoundArrays
=
721 _mesa_vao_enable_to_vp_inputs(mode
, eff_bound_arrays
);
724 /* Mark all the effective bound arrays as processed. */
725 mask
&= ~eff_bound_arrays
;
728 /* Scanning of common bindings for user space arrays.
731 const struct gl_array_attributes
*attrib
= &vao
->VertexAttrib
[i
];
732 const GLbitfield bound
= VERT_BIT(i
);
734 /* Note that user space array pointers can only happen using a one
735 * to one binding point to array mapping.
736 * The OpenGL 4.x/ARB_vertex_attrib_binding api does not support
737 * user space arrays collected at multiple binding points.
738 * The only provider of user space interleaved arrays with a single
739 * binding point is the mesa internal vbo module. But that one
740 * provides a perfect interleaved set of arrays.
742 * If this would not be true we would potentially get attribute arrays
743 * with user space pointers that may not lie within the
744 * MaxRelativeOffset range but still attached to a single binding.
745 * Then we would need to store the effective attribute and binding
746 * grouping information in a seperate array beside
747 * gl_array_attributes/gl_vertex_buffer_binding.
749 assert(_mesa_bitcount(binding
->_BoundArrays
& vao
->_Enabled
) == 1
750 || (vao
->_Enabled
& ~binding
->_BoundArrays
) == 0);
752 /* Start this current effective binding with the array */
753 GLbitfield eff_bound_arrays
= bound
;
755 const GLubyte
*ptr
= attrib
->Ptr
;
756 unsigned vertex_end
= attrib
->_ElementSize
;
758 /* Walk other user space arrays and see which are interleaved
759 * using the same binding parameters.
761 GLbitfield scanmask
= mask
& ~vbos
& ~bound
;
763 const int j
= u_bit_scan(&scanmask
);
764 const struct gl_array_attributes
*attrib2
= &vao
->VertexAttrib
[j
];
765 const struct gl_vertex_buffer_binding
*binding2
=
766 &vao
->BufferBinding
[attrib2
->BufferBindingIndex
];
768 /* See the comment at the same assert above. */
769 assert(_mesa_bitcount(binding2
->_BoundArrays
& vao
->_Enabled
) == 1
770 || (vao
->_Enabled
& ~binding
->_BoundArrays
) == 0);
772 /* Check if we have an identical binding */
773 if (binding
->Stride
!= binding2
->Stride
)
775 if (binding
->InstanceDivisor
!= binding2
->InstanceDivisor
)
777 if (ptr
<= attrib2
->Ptr
) {
778 if (ptr
+ binding
->Stride
< attrib2
->Ptr
+ attrib2
->_ElementSize
)
780 unsigned end
= attrib2
->Ptr
+ attrib2
->_ElementSize
- ptr
;
781 vertex_end
= MAX2(vertex_end
, end
);
783 if (attrib2
->Ptr
+ binding
->Stride
< ptr
+ vertex_end
)
785 vertex_end
+= (GLsizei
)(ptr
- attrib2
->Ptr
);
789 /* User space buffer object */
790 assert(!_mesa_is_bufferobj(binding2
->BufferObj
));
792 eff_bound_arrays
|= VERT_BIT(j
);
795 /* Update the back reference from the attrib to the binding */
796 GLbitfield attrmask
= eff_bound_arrays
;
798 const int j
= u_bit_scan(&attrmask
);
799 struct gl_array_attributes
*attrib2
= &vao
->VertexAttrib
[j
];
801 /* Update the index into the common binding point and the offset */
802 attrib2
->_EffBufferBindingIndex
= bindex
;
803 attrib2
->_EffRelativeOffset
= attrib2
->Ptr
- ptr
;
804 assert(attrib2
->_EffRelativeOffset
<= binding
->Stride
);
806 /* Only enabled arrays shall appear in the unique bindings */
807 assert(attrib2
->Enabled
);
809 /* Finally this is the set of effectively bound arrays */
810 binding
->_EffOffset
= (GLintptr
)ptr
;
811 /* The bound arrays past the VERT_ATTRIB_{POS,GENERIC0} mapping. */
812 binding
->_EffBoundArrays
=
813 _mesa_vao_enable_to_vp_inputs(mode
, eff_bound_arrays
);
815 /* Mark all the effective bound arrays as processed. */
816 mask
&= ~eff_bound_arrays
;
821 /* Make sure the above code works as expected. */
822 for (gl_vert_attrib attr
= 0; attr
< VERT_ATTRIB_MAX
; ++attr
) {
823 /* Query the original api defined attrib/binding information ... */
824 const unsigned char *const map
=_mesa_vao_attribute_map
[mode
];
825 const struct gl_array_attributes
*attrib
= &vao
->VertexAttrib
[map
[attr
]];
826 if (attrib
->Enabled
) {
827 const struct gl_vertex_buffer_binding
*binding
=
828 &vao
->BufferBinding
[attrib
->BufferBindingIndex
];
829 /* ... and compare that with the computed attrib/binding */
830 const struct gl_vertex_buffer_binding
*binding2
=
831 &vao
->BufferBinding
[attrib
->_EffBufferBindingIndex
];
832 assert(binding
->Stride
== binding2
->Stride
);
833 assert(binding
->InstanceDivisor
== binding2
->InstanceDivisor
);
834 assert(binding
->BufferObj
== binding2
->BufferObj
);
835 if (_mesa_is_bufferobj(binding
->BufferObj
)) {
836 assert(attrib
->_EffRelativeOffset
<= MaxRelativeOffset
);
837 assert(binding
->Offset
+ attrib
->RelativeOffset
==
838 binding2
->_EffOffset
+ attrib
->_EffRelativeOffset
);
840 assert(attrib
->_EffRelativeOffset
< binding
->Stride
);
841 assert((GLintptr
)attrib
->Ptr
==
842 binding2
->_EffOffset
+ attrib
->_EffRelativeOffset
);
851 _mesa_set_vao_immutable(struct gl_context
*ctx
,
852 struct gl_vertex_array_object
*vao
)
854 _mesa_update_vao_derived_arrays(ctx
, vao
);
856 vao
->SharedAndImmutable
= true;
861 _mesa_all_varyings_in_vbos(const struct gl_vertex_array_object
*vao
)
863 /* Walk those enabled arrays that have the default vbo attached */
864 GLbitfield mask
= vao
->_Enabled
& ~vao
->VertexAttribBufferMask
;
867 /* Do not use u_bit_scan64 as we can walk multiple
868 * attrib arrays at once
870 const int i
= ffs(mask
) - 1;
871 const struct gl_array_attributes
*attrib_array
=
872 &vao
->VertexAttrib
[i
];
873 const struct gl_vertex_buffer_binding
*buffer_binding
=
874 &vao
->BufferBinding
[attrib_array
->BufferBindingIndex
];
876 /* Only enabled arrays shall appear in the _Enabled bitmask */
877 assert(attrib_array
->Enabled
);
878 /* We have already masked out vao->VertexAttribBufferMask */
879 assert(!_mesa_is_bufferobj(buffer_binding
->BufferObj
));
881 /* Bail out once we find the first non vbo with a non zero stride */
882 if (buffer_binding
->Stride
!= 0)
885 /* Note that we cannot use the xor variant since the _BoundArray mask
886 * may contain array attributes that are bound but not enabled.
888 mask
&= ~buffer_binding
->_BoundArrays
;
895 _mesa_all_buffers_are_unmapped(const struct gl_vertex_array_object
*vao
)
897 /* Walk the enabled arrays that have a vbo attached */
898 GLbitfield mask
= vao
->_Enabled
& vao
->VertexAttribBufferMask
;
901 const int i
= ffs(mask
) - 1;
902 const struct gl_array_attributes
*attrib_array
=
903 &vao
->VertexAttrib
[i
];
904 const struct gl_vertex_buffer_binding
*buffer_binding
=
905 &vao
->BufferBinding
[attrib_array
->BufferBindingIndex
];
907 /* Only enabled arrays shall appear in the _Enabled bitmask */
908 assert(attrib_array
->Enabled
);
909 /* We have already masked with vao->VertexAttribBufferMask */
910 assert(_mesa_is_bufferobj(buffer_binding
->BufferObj
));
912 /* Bail out once we find the first disallowed mapping */
913 if (_mesa_check_disallowed_mapping(buffer_binding
->BufferObj
))
916 /* We have handled everything that is bound to this buffer_binding. */
917 mask
&= ~buffer_binding
->_BoundArrays
;
923 /**********************************************************************/
925 /**********************************************************************/
929 * ARB version of glBindVertexArray()
931 static ALWAYS_INLINE
void
932 bind_vertex_array(struct gl_context
*ctx
, GLuint id
, bool no_error
)
934 struct gl_vertex_array_object
*const oldObj
= ctx
->Array
.VAO
;
935 struct gl_vertex_array_object
*newObj
= NULL
;
937 assert(oldObj
!= NULL
);
939 if (oldObj
->Name
== id
)
940 return; /* rebinding the same array object- no change */
943 * Get pointer to new array object (newObj)
946 /* The spec says there is no array object named 0, but we use
947 * one internally because it simplifies things.
949 newObj
= ctx
->Array
.DefaultVAO
;
952 /* non-default array object */
953 newObj
= _mesa_lookup_vao(ctx
, id
);
954 if (!no_error
&& !newObj
) {
955 _mesa_error(ctx
, GL_INVALID_OPERATION
,
956 "glBindVertexArray(non-gen name)");
960 newObj
->EverBound
= GL_TRUE
;
963 /* The _DrawArrays pointer is pointing at the VAO being unbound and
964 * that VAO may be in the process of being deleted. If it's not going
965 * to be deleted, this will have no effect, because the pointer needs
966 * to be updated by the VBO module anyway.
968 * Before the VBO module can update the pointer, we have to set it
969 * to NULL for drivers not to set up arrays which are not bound,
970 * or to prevent a crash if the VAO being unbound is going to be
973 _mesa_set_draw_vao(ctx
, ctx
->Array
._EmptyVAO
, 0);
975 ctx
->NewState
|= _NEW_ARRAY
;
976 _mesa_reference_vao(ctx
, &ctx
->Array
.VAO
, newObj
);
981 _mesa_BindVertexArray_no_error(GLuint id
)
983 GET_CURRENT_CONTEXT(ctx
);
984 bind_vertex_array(ctx
, id
, true);
989 _mesa_BindVertexArray(GLuint id
)
991 GET_CURRENT_CONTEXT(ctx
);
992 bind_vertex_array(ctx
, id
, false);
997 * Delete a set of array objects.
999 * \param n Number of array objects to delete.
1000 * \param ids Array of \c n array object IDs.
1003 delete_vertex_arrays(struct gl_context
*ctx
, GLsizei n
, const GLuint
*ids
)
1007 for (i
= 0; i
< n
; i
++) {
1008 struct gl_vertex_array_object
*obj
= _mesa_lookup_vao(ctx
, ids
[i
]);
1011 assert(obj
->Name
== ids
[i
]);
1013 /* If the array object is currently bound, the spec says "the binding
1014 * for that object reverts to zero and the default vertex array
1017 if (obj
== ctx
->Array
.VAO
)
1018 _mesa_BindVertexArray_no_error(0);
1020 /* The ID is immediately freed for re-use */
1021 _mesa_HashRemoveLocked(ctx
->Array
.Objects
, obj
->Name
);
1023 if (ctx
->Array
.LastLookedUpVAO
== obj
)
1024 _mesa_reference_vao(ctx
, &ctx
->Array
.LastLookedUpVAO
, NULL
);
1025 if (ctx
->Array
._DrawVAO
== obj
)
1026 _mesa_set_draw_vao(ctx
, ctx
->Array
._EmptyVAO
, 0);
1028 /* Unreference the array object.
1029 * If refcount hits zero, the object will be deleted.
1031 _mesa_reference_vao(ctx
, &obj
, NULL
);
1038 _mesa_DeleteVertexArrays_no_error(GLsizei n
, const GLuint
*ids
)
1040 GET_CURRENT_CONTEXT(ctx
);
1041 delete_vertex_arrays(ctx
, n
, ids
);
1046 _mesa_DeleteVertexArrays(GLsizei n
, const GLuint
*ids
)
1048 GET_CURRENT_CONTEXT(ctx
);
1051 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDeleteVertexArray(n)");
1055 delete_vertex_arrays(ctx
, n
, ids
);
1060 * Generate a set of unique array object IDs and store them in \c arrays.
1061 * Helper for _mesa_GenVertexArrays() and _mesa_CreateVertexArrays()
1064 * \param n Number of IDs to generate.
1065 * \param arrays Array of \c n locations to store the IDs.
1066 * \param create Indicates that the objects should also be created.
1067 * \param func The name of the GL entry point.
1070 gen_vertex_arrays(struct gl_context
*ctx
, GLsizei n
, GLuint
*arrays
,
1071 bool create
, const char *func
)
1079 first
= _mesa_HashFindFreeKeyBlock(ctx
->Array
.Objects
, n
);
1081 /* For the sake of simplicity we create the array objects in both
1082 * the Gen* and Create* cases. The only difference is the value of
1083 * EverBound, which is set to true in the Create* case.
1085 for (i
= 0; i
< n
; i
++) {
1086 struct gl_vertex_array_object
*obj
;
1087 GLuint name
= first
+ i
;
1089 obj
= _mesa_new_vao(ctx
, name
);
1091 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "%s", func
);
1094 obj
->EverBound
= create
;
1095 _mesa_HashInsertLocked(ctx
->Array
.Objects
, obj
->Name
, obj
);
1096 arrays
[i
] = first
+ i
;
1102 gen_vertex_arrays_err(struct gl_context
*ctx
, GLsizei n
, GLuint
*arrays
,
1103 bool create
, const char *func
)
1106 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(n < 0)", func
);
1110 gen_vertex_arrays(ctx
, n
, arrays
, create
, func
);
1115 * ARB version of glGenVertexArrays()
1116 * All arrays will be required to live in VBOs.
1119 _mesa_GenVertexArrays_no_error(GLsizei n
, GLuint
*arrays
)
1121 GET_CURRENT_CONTEXT(ctx
);
1122 gen_vertex_arrays(ctx
, n
, arrays
, false, "glGenVertexArrays");
1127 _mesa_GenVertexArrays(GLsizei n
, GLuint
*arrays
)
1129 GET_CURRENT_CONTEXT(ctx
);
1130 gen_vertex_arrays_err(ctx
, n
, arrays
, false, "glGenVertexArrays");
1135 * ARB_direct_state_access
1136 * Generates ID's and creates the array objects.
1139 _mesa_CreateVertexArrays_no_error(GLsizei n
, GLuint
*arrays
)
1141 GET_CURRENT_CONTEXT(ctx
);
1142 gen_vertex_arrays(ctx
, n
, arrays
, true, "glCreateVertexArrays");
1147 _mesa_CreateVertexArrays(GLsizei n
, GLuint
*arrays
)
1149 GET_CURRENT_CONTEXT(ctx
);
1150 gen_vertex_arrays_err(ctx
, n
, arrays
, true, "glCreateVertexArrays");
1155 * Determine if ID is the name of an array object.
1157 * \param id ID of the potential array object.
1158 * \return \c GL_TRUE if \c id is the name of a array object,
1159 * \c GL_FALSE otherwise.
1161 GLboolean GLAPIENTRY
1162 _mesa_IsVertexArray( GLuint id
)
1164 struct gl_vertex_array_object
* obj
;
1165 GET_CURRENT_CONTEXT(ctx
);
1166 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
1168 obj
= _mesa_lookup_vao(ctx
, id
);
1170 return obj
!= NULL
&& obj
->EverBound
;
1175 * Sets the element array buffer binding of a vertex array object.
1177 * This is the ARB_direct_state_access equivalent of
1178 * glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer).
1180 static ALWAYS_INLINE
void
1181 vertex_array_element_buffer(struct gl_context
*ctx
, GLuint vaobj
, GLuint buffer
,
1184 struct gl_vertex_array_object
*vao
;
1185 struct gl_buffer_object
*bufObj
;
1187 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1190 /* The GL_ARB_direct_state_access specification says:
1192 * "An INVALID_OPERATION error is generated by
1193 * VertexArrayElementBuffer if <vaobj> is not [compatibility profile:
1194 * zero or] the name of an existing vertex array object."
1196 vao
=_mesa_lookup_vao_err(ctx
, vaobj
, "glVertexArrayElementBuffer");
1200 vao
= _mesa_lookup_vao(ctx
, vaobj
);
1205 /* The GL_ARB_direct_state_access specification says:
1207 * "An INVALID_OPERATION error is generated if <buffer> is not zero
1208 * or the name of an existing buffer object."
1210 bufObj
= _mesa_lookup_bufferobj_err(ctx
, buffer
,
1211 "glVertexArrayElementBuffer");
1213 bufObj
= _mesa_lookup_bufferobj(ctx
, buffer
);
1216 bufObj
= ctx
->Shared
->NullBufferObj
;
1220 _mesa_reference_buffer_object(ctx
, &vao
->IndexBufferObj
, bufObj
);
1225 _mesa_VertexArrayElementBuffer_no_error(GLuint vaobj
, GLuint buffer
)
1227 GET_CURRENT_CONTEXT(ctx
);
1228 vertex_array_element_buffer(ctx
, vaobj
, buffer
, true);
1233 _mesa_VertexArrayElementBuffer(GLuint vaobj
, GLuint buffer
)
1235 GET_CURRENT_CONTEXT(ctx
);
1236 vertex_array_element_buffer(ctx
, vaobj
, buffer
, false);
1241 _mesa_GetVertexArrayiv(GLuint vaobj
, GLenum pname
, GLint
*param
)
1243 GET_CURRENT_CONTEXT(ctx
);
1244 struct gl_vertex_array_object
*vao
;
1246 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1248 /* The GL_ARB_direct_state_access specification says:
1250 * "An INVALID_OPERATION error is generated if <vaobj> is not
1251 * [compatibility profile: zero or] the name of an existing
1252 * vertex array object."
1254 vao
=_mesa_lookup_vao_err(ctx
, vaobj
, "glGetVertexArrayiv");
1258 /* The GL_ARB_direct_state_access specification says:
1260 * "An INVALID_ENUM error is generated if <pname> is not
1261 * ELEMENT_ARRAY_BUFFER_BINDING."
1263 if (pname
!= GL_ELEMENT_ARRAY_BUFFER_BINDING
) {
1264 _mesa_error(ctx
, GL_INVALID_ENUM
,
1265 "glGetVertexArrayiv(pname != "
1266 "GL_ELEMENT_ARRAY_BUFFER_BINDING)");
1270 param
[0] = vao
->IndexBufferObj
->Name
;