1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
|
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>glMemoryBarrier - OpenGL 4 Reference Pages</title>
<link rel="stylesheet" type="text/css" href="opengl-man.css"/>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1"/>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
MathML: {
extensions: ["content-mathml.js"]
},
tex2jax: {
inlineMath: [['$','$'], ['\\(','\\)']]
}
});
</script>
<script type="text/javascript" src="https://c328740.ssl.cf1.rackcdn.com/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"/>
</head>
<body>
<header/>
<div class="refentry" id="glMemoryBarrier">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glMemoryBarrier — defines a barrier ordering memory transactions</p>
</div>
<div class="refsynopsisdiv">
<h2>C Specification</h2>
<div class="funcsynopsis">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glMemoryBarrier</strong>(</code>
</td>
<td>GLbitfield <var class="pdparam">barriers</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glMemoryBarrierByRegion</strong>(</code>
</td>
<td>GLbitfield <var class="pdparam">barriers</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
</div>
<div class="refsect1" id="parameters">
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<em class="parameter">
<code>barriers</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the barriers to insert.
</p>
<p>
For <code class="function">glMemoryBarrier</code>, must be a
bitwise combination of any of
<code class="constant">GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT</code>,
<code class="constant">GL_ELEMENT_ARRAY_BARRIER_BIT</code>,
<code class="constant">GL_UNIFORM_BARRIER_BIT</code>,
<code class="constant">GL_TEXTURE_FETCH_BARRIER_BIT</code>,
<code class="constant">GL_SHADER_IMAGE_ACCESS_BARRIER_BIT</code>,
<code class="constant">GL_COMMAND_BARRIER_BIT</code>,
<code class="constant">GL_PIXEL_BUFFER_BARRIER_BIT</code>,
<code class="constant">GL_TEXTURE_UPDATE_BARRIER_BIT</code>,
<code class="constant">GL_BUFFER_UPDATE_BARRIER_BIT</code>,
<code class="constant">GL_FRAMEBUFFER_BARRIER_BIT</code>,
<code class="constant">GL_TRANSFORM_FEEDBACK_BARRIER_BIT</code>,
<code class="constant">GL_ATOMIC_COUNTER_BARRIER_BIT</code>, or
<code class="constant">GL_SHADER_STORAGE_BARRIER_BIT</code>.
</p>
<p>
For <code class="function">glMemoryBarrier</code>, must be a
bitwise combination of any of
<code class="constant">GL_ATOMIC_COUNTER_BARRIER_BIT</code>, or
<code class="constant">GL_FRAMEBUFFER_BARRIER_BIT</code>,
<code class="constant">GL_SHADER_IMAGE_ACCESS_BARRIER_BIT</code>,
<code class="constant">GL_SHADER_STORAGE_BARRIER_BIT</code>.
<code class="constant">GL_TEXTURE_FETCH_BARRIER_BIT</code>, or
<code class="constant">GL_UNIFORM_BARRIER_BIT</code>.
</p>
<p>
If the special value
<code class="constant">GL_ALL_BARRIER_BITS</code> is specified,
all supported barriers for the corresponding command
will be inserted.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description for <code class="function">glMemoryBarrier</code></h2>
<p>
<code class="function">glMemoryBarrier</code> defines a barrier ordering
the memory transactions issued prior to the command relative to
those issued after the barrier. For the purposes of this
ordering, memory transactions performed by shaders are
considered to be issued by the rendering command that triggered
the execution of the shader. <em class="parameter"><code>barriers</code></em> is
a bitfield indicating the set of operations that are
synchronized with shader stores; the bits used in
<em class="parameter"><code>barriers</code></em> are as follows:
</p>
<p>
</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="constant">GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
If set, vertex data sourced from
buffer objects after the barrier will reflect data written by shaders
prior to the barrier. The set of buffer objects affected by this bit
is derived from the buffer object bindings used for
generic vertex attributes derived from the <code class="constant">GL_VERTEX_ATTRIB_ARRAY_BUFFER</code> bindings.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_ELEMENT_ARRAY_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
If set, vertex array indices sourced from
buffer objects after the barrier will reflect data written by shaders
prior to the barrier. The buffer objects affected by this bit are
derived from the <code class="constant">GL_ELEMENT_ARRAY_BUFFER</code> binding.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_UNIFORM_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Shader uniforms sourced from buffer objects after the barrier will reflect data
written by shaders prior to the barrier.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_TEXTURE_FETCH_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Texture fetches from shaders, including
fetches from buffer object memory via buffer textures, after the
barrier will reflect data written by shaders prior to the barrier.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_SHADER_IMAGE_ACCESS_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Memory accesses using shader image
load, store, and atomic built-in functions issued after the barrier
will reflect data written by shaders prior to the barrier.
Additionally, image stores and atomics issued after the barrier will
not execute until all memory accesses (e.g., loads, stores, texture
fetches, vertex fetches) initiated prior to the barrier complete.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_COMMAND_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Command data sourced from buffer objects by
Draw*Indirect commands after the barrier will reflect data written by
shaders prior to the barrier. The buffer objects affected by this bit
are derived from the <code class="constant">GL_DRAW_INDIRECT_BUFFER</code> binding.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_PIXEL_BUFFER_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Reads and writes of buffer objects via the
<code class="constant">GL_PIXEL_PACK_BUFFER</code> and <code class="constant">GL_PIXEL_UNPACK_BUFFER</code>
bindings (via <a class="citerefentry" href="glReadPixels.xhtml"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>,
<a class="citerefentry" href="glTexSubImage.xhtml"><span class="citerefentry"><span class="refentrytitle">glTexSubImage</span></span></a>, etc.) after the
barrier will reflect data written by shaders prior to the barrier.
Additionally, buffer object writes issued after the barrier will wait
on the completion of all shader writes initiated prior to the barrier.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_TEXTURE_UPDATE_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Writes to a texture via <code class="function">glTex(Sub)Image*</code>,
<code class="function">glCopyTex(Sub)Image*</code>, <code class="function">glCompressedTex(Sub)Image*</code>, and reads via
<a class="citerefentry" href="glGetTexImage.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetTexImage</span></span></a> after the barrier will reflect data written by shaders
prior to the barrier. Additionally, texture writes from these
commands issued after the barrier will not execute until all shader
writes initiated prior to the barrier complete.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_BUFFER_UPDATE_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Reads or writes via <a class="citerefentry" href="glBufferSubData.xhtml"><span class="citerefentry"><span class="refentrytitle">glBufferSubData</span></span></a>,
<a class="citerefentry" href="glCopyBufferSubData.xhtml"><span class="citerefentry"><span class="refentrytitle">glCopyBufferSubData</span></span></a>,
or <a class="citerefentry" href="glGetBufferSubData.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetBufferSubData</span></span></a>, or
to buffer object memory mapped by <a class="citerefentry" href="glMapBuffer.xhtml"><span class="citerefentry"><span class="refentrytitle">glMapBuffer</span></span></a>
or <a class="citerefentry" href="glMapBufferRange.xhtml"><span class="citerefentry"><span class="refentrytitle">glMapBufferRange</span></span></a> after the barrier
will reflect data written by shaders prior to the barrier.
Additionally, writes via these commands issued after the barrier will
wait on the completion of any shader writes to the same memory
initiated prior to the barrier.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_FRAMEBUFFER_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Reads and writes via framebuffer object
attachments after the barrier will reflect data written by shaders
prior to the barrier. Additionally, framebuffer writes issued after
the barrier will wait on the completion of all shader writes issued
prior to the barrier.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_TRANSFORM_FEEDBACK_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Writes via transform feedback
bindings after the barrier will reflect data written by shaders prior
to the barrier. Additionally, transform feedback writes issued after
the barrier will wait on the completion of all shader writes issued
prior to the barrier.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_ATOMIC_COUNTER_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Accesses to atomic counters after the
barrier will reflect writes prior to the barrier.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_SHADER_STORAGE_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Accesses to shader storage blocks after the
barrier will reflect writes prior to the barrier.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_QUERY_BUFFER_BARRIER_BIT</code>
</span>
</dt>
<dd>
<p>
Writes of buffer objects via the <code class="constant">GL_QUERY_BUFFER</code>
binding after the barrier will reflect data written
by shaders prior to the barrier. Additionally, buffer object writes
issued after the barrier will wait on the completion of all shader
writes initiated prior to the barrier.
</p>
</dd>
</dl>
</div>
<p>
</p>
<p>
If <em class="parameter"><code>barriers</code></em> is
<code class="constant">GL_ALL_BARRIER_BITS</code>, shader memory accesses
will be synchronized relative to all the operations described
above.
</p>
<p>
Implementations may cache buffer object and texture image memory that
could be written by shaders in multiple caches; for example, there may be
separate caches for texture, vertex fetching, and one or more caches for
shader memory accesses. Implementations are not required to keep these
caches coherent with shader memory writes. Stores issued by one
invocation may not be immediately observable by other pipeline stages or
other shader invocations because the value stored may remain in a cache
local to the processor executing the store, or because data overwritten by
the store is still in a cache elsewhere in the system. When
<code class="function">glMemoryBarrier</code> is called, the GL flushes
and/or invalidates any caches relevant to the operations
specified by the <em class="parameter"><code>barriers</code></em> parameter to
ensure consistent ordering of operations across the barrier.
</p>
<p>
To allow for independent shader invocations to communicate by reads and
writes to a common memory address, image variables in the OpenGL Shading
Language may be declared as "coherent". Buffer object or texture image
memory accessed through such variables may be cached only if caches are
automatically updated due to stores issued by any other shader invocation.
If the same address is accessed using both coherent and non-coherent
variables, the accesses using variables declared as coherent will observe
the results stored using coherent variables in other invocations. Using
variables declared as "coherent" guarantees only that the results of
stores will be immediately visible to shader invocations using
similarly-declared variables; calling
<code class="function">glMemoryBarrier</code> is required to ensure that
the stores are visible to other operations.
</p>
<p>
The following guidelines may be helpful in choosing when to use coherent
memory accesses and when to use barriers.
</p>
<p>
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
Data that are read-only or constant may be accessed
without using coherent variables or calling
<code class="function">MemoryBarrier</code>(). Updates to the
read-only data via API calls such as
<code class="function">glBufferSubData</code> will invalidate
shader caches implicitly as required.
</p>
</li>
<li class="listitem">
<p>
Data that are shared between shader invocations at a
fine granularity (e.g., written by one invocation,
consumed by another invocation) should use coherent
variables to read and write the shared data.
</p>
</li>
<li class="listitem">
<p>
Data written by one shader invocation and consumed
by other shader invocations launched as a result of
its execution ("dependent invocations")
should use coherent variables in the producing
shader invocation and call
<code class="function">memoryBarrier</code>() after the last
write. The consuming shader invocation should also
use coherent variables.
</p>
</li>
<li class="listitem">
<p>
Data written to image variables in one rendering
pass and read by the shader in a later pass need not
use coherent variables or memoryBarrier(). Calling
<code class="function">glMemoryBarrier</code> with the
SHADER_IMAGE_ACCESS_BARRIER_BIT set in
<em class="parameter"><code>barriers</code></em> between passes is
necessary.
</p>
</li>
<li class="listitem">
<p>
Data written by the shader in one rendering pass and
read by another mechanism (e.g., vertex or index
buffer pulling) in a later pass need not use
coherent variables or
<code class="function">memoryBarrier</code>(). Calling
<code class="function">glMemoryBarrier</code> with the
appropriate bits set in
<em class="parameter"><code>barriers</code></em> between passes is
necessary.
</p>
</li>
</ul>
</div>
<p>
</p>
</div>
<div class="refsect1" id="description2">
<h2>Description for <code class="function">glMemoryBarrierByRegion</code></h2>
<p>
<code class="function">glMemoryBarrierByRegion</code> behaves as
described above for <code class="function">glMemoryBarrier</code>, with
two differences:
</p>
<p>
First, it narrows the region under consideration so that only
reads and writes of prior fragment shaders that are invoked for
a smaller region of the framebuffer will be completed/reflected
prior to subsequent reads and writes of following fragment
shaders. The size of the region is implementation-dependent and
may be as small as one framebuffer pixel.
</p>
<p>
Second, it only applies to memory transactions that may be read
by or written by a fragment shader. Therefore, only the barrier
bits
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>
<code class="constant">GL_ATOMIC_COUNTER_BARRIER_BIT</code>
</p>
</li>
<li class="listitem">
<p>
<code class="constant">GL_FRAMEBUFFER_BARRIER_BIT</code>
</p>
</li>
<li class="listitem">
<p>
<code class="constant">GL_SHADER_IMAGE_ACCESS_BARRIER_BIT</code>
</p>
</li>
<li class="listitem">
<p>
<code class="constant">GL_SHADER_STORAGE_BARRIER_BIT</code>
</p>
</li>
<li class="listitem">
<p>
<code class="constant">GL_TEXTURE_FETCH_BARRIER_BIT</code>
</p>
</li>
<li class="listitem">
<p>
<code class="constant">GL_UNIFORM_BARRIER_BIT</code>
</p>
</li>
</ul>
</div>
<p>
are supported.
</p>
<p>
When <em class="parameter"><code>barriers</code></em> is
<code class="constant">GL_ALL_BARRIER_BITS</code>, shader memory accesses
will be synchronized relative to all these barrier bits, but not
to other barrier bits specific to
<code class="function">glMemoryBarrier</code>. This implies that reads
and writes for scatter/gather-like algorithms may or may not be
completed/reflected after a
<code class="function">glMemoryBarrierByRegion</code> command. However,
for uses such as deferred shading, where a linked list of
visible surfaces with the head at a framebuffer address may be
constructed, and the entirety of the list is only dependent on
previous executions at that framebuffer address,
<code class="function">glMemoryBarrierByRegion</code> may be
significantly more efficient than
<code class="function">glMemoryBarrier</code>.
</p>
</div>
<div class="refsect1" id="notes">
<h2>Notes</h2>
<p>
<code class="constant">GL_SHADER_STORAGE_BARRIER_BIT</code> is available only if the GL version is 4.3 or higher.
</p>
<p>
<code class="constant">GL_QUERY_BUFFER_BARRIER_BIT</code> is available only if the GL version is 4.4 or higher.
</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p>
<code class="constant">GL_INVALID_VALUE</code> is generated if
<em class="parameter"><code>barriers</code></em> is not the special value
<code class="constant">GL_ALL_BARRIER_BITS</code>, and has any bits set
other than those described above for
<code class="function">glMemoryBarrier</code> or
<code class="function">glMemoryBarrierByRegion</code> respectively.
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
<colgroup>
<col style="text-align: left; "/>
<col style="text-align: center; " class="firstvers"/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; "/>
<col style="text-align: center; " class="lastvers"/>
</colgroup>
<thead>
<tr>
<th style="text-align: left; border-right: 2px solid ; ">
</th>
<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
<span class="bold"><strong>OpenGL Version</strong></span>
</th>
</tr>
<tr>
<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>Function / Feature Name</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.4</strong></span>
</th>
<th style="text-align: center; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.5</strong></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<code class="function">glMemoryBarrier</code>
</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
<td style="text-align: center; border-bottom: 2px solid ; ">✔</td>
</tr>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">
<code class="function">glMemoryBarrierByRegion</code>
</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; ">✔</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="glBindImageTexture.xhtml"><span class="citerefentry"><span class="refentrytitle">glBindImageTexture</span></span></a>,
<a class="citerefentry" href="glBufferData.xhtml"><span class="citerefentry"><span class="refentrytitle">glBufferData</span></span></a>,
<a class="citerefentry" href="glMapBuffer.xhtml"><span class="citerefentry"><span class="refentrytitle">glMapBuffer</span></span></a>,
<a class="citerefentry" href="glMapBufferRange.xhtml"><span class="citerefentry"><span class="refentrytitle">glMapBufferRange</span></span></a>,
<a class="citerefentry" href="glFlushMappedBufferRange.xhtml"><span class="citerefentry"><span class="refentrytitle">glFlushMappedBufferRange</span></span></a>,
<a class="citerefentry" href="memoryBarrier.xhtml"><span class="citerefentry"><span class="refentrytitle">memoryBarrier</span></span></a>
</p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright <span class="trademark"/>© 2011-2014 Khronos Group.
This material may be distributed subject to the terms and conditions set forth in
the Open Publication License, v 1.0, 8 June 1999.
<a class="link" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
</p>
</div>
</div>
<footer/>
</body>
</html>
|
