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"opengl-man.css" /><title>memoryBarrier - OpenGL Shading Language (GLSL)
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.69.1" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"memoryBarrier"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>memoryBarrier — controls the ordering of memory transactions issued by a single shader invocation
</p></div><div class=
"refsynopsisdiv"><h2>Declaration
</h2><div class=
"funcsynopsis"><p><code class=
"funcdef">uint
<b class=
"fsfunc">memoryBarrier
</b>(
</code>void
<code>)
</code>;
</p></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
5 <code class=
"function">memoryBarrier
</code> waits on the completion of all memory accesses resulting from the use of
6 image variables or atomic counters and then returns with no other effect. When this function returns, the
7 results of any memory stores performed using coherent variables performed prior to the call will be visible
8 to any future coherent memory access to the same addresses from other shader invocations. In particular,
9 the values written this way in one shader stage are guaranteed to be visible to coherent memory accesses
10 performed by shader invocations in subsequent stages when those invocations were triggered by the
11 execution of the original shader invocation (e.g., fragment shader invocations for a primitive resulting
12 from a particular geometry shader invocation).
13 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"versions"></a><h2>Version Support
</h2><div class=
"informaltable"><table border=
"1"><colgroup><col align=
"left" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /></colgroup><thead><tr><th align=
"left"><span class=
"bold"><strong>Function
</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.10</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.20</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.30</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.40</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.50</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
3.30</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
4.00</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
4.10</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
4.20</strong></span></th><th align=
"center"><span class=
"bold"><strong>Version
4.30</strong></span></th></tr><tr><th align=
"left">memoryBarrier
</th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th></tr></thead></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
14 <a href=
"imageLoad.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageLoad
</span></span></a>,
15 <a href=
"imageStore.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageStore
</span></span></a>,
16 <a href=
"imageAtomicAdd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicAdd
</span></span></a>,
17 <a href=
"imageAtomicMin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicMin
</span></span></a>,
18 <a href=
"imageAtomicMax.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicMax
</span></span></a>,
19 <a href=
"imageAtomicXor.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicXor
</span></span></a>,
20 <a href=
"imageAtomicOr.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicOr
</span></span></a>,
21 <a href=
"imageAtomicAnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicAnd
</span></span></a>,
22 <a href=
"imageAtomicExchange.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicExchange
</span></span></a>,
23 <a href=
"imageAtomicCompSwap.xml"><span class=
"citerefentry"><span class=
"refentrytitle">imageAtomicCompSwap
</span></span></a>,
24 <a href=
"memoryBarrier.xml"><span class=
"citerefentry"><span class=
"refentrytitle">memoryBarrier
</span></span></a>
25 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
26 Copyright
<span class=
"trademark"></span>©
2011 Khronos Group.
27 This material may be distributed subject to the terms and conditions set forth in
28 the Open Publication License, v
1.0,
8 June
1999.
29 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
30 </p></div></div></body></html>
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