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<head>
<title>memoryBarrier - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="memoryBarrier">
<div class="titlepage"/>
<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">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">uint <strong class="fsfunc">memoryBarrier</strong>(</code>
</td>
<td>void<code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="function">memoryBarrier</code> waits on the completion of all memory accesses resulting from the use of
image variables or atomic counters and then returns with no other effect. When this function returns, the
results of any memory stores performed using coherent variables performed prior to the call will be visible
to any future coherent memory access to the same addresses from other shader invocations. In particular,
the values written this way in one shader stage are guaranteed to be visible to coherent memory accesses
performed by shader invocations in subsequent stages when those invocations were triggered by the
execution of the original shader invocation (e.g., fragment shader invocations for a primitive resulting
from a particular geometry shader invocation).
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
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</th>
<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
<span class="bold"><strong>OpenGL Shading Language Version</strong></span>
</th>
</tr>
<tr>
<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>Function Name</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>1.10</strong></span>
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<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>1.20</strong></span>
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<span class="bold"><strong>1.30</strong></span>
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<span class="bold"><strong>1.40</strong></span>
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<span class="bold"><strong>1.50</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.30</strong></span>
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<span class="bold"><strong>4.00</strong></span>
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<span class="bold"><strong>4.10</strong></span>
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<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.20</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.30</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.40</strong></span>
</th>
<th style="text-align: center; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.50</strong></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">memoryBarrier</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>
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<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="imageLoad.xhtml"><span class="citerefentry"><span class="refentrytitle">imageLoad</span></span></a>,
<a class="citerefentry" href="imageStore.xhtml"><span class="citerefentry"><span class="refentrytitle">imageStore</span></span></a>,
<a class="citerefentry" href="imageAtomicAdd.xhtml"><span class="citerefentry"><span class="refentrytitle">imageAtomicAdd</span></span></a>,
<a class="citerefentry" href="imageAtomicMin.xhtml"><span class="citerefentry"><span class="refentrytitle">imageAtomicMin</span></span></a>,
<a class="citerefentry" href="imageAtomicMax.xhtml"><span class="citerefentry"><span class="refentrytitle">imageAtomicMax</span></span></a>,
<a class="citerefentry" href="imageAtomicXor.xhtml"><span class="citerefentry"><span class="refentrytitle">imageAtomicXor</span></span></a>,
<a class="citerefentry" href="imageAtomicOr.xhtml"><span class="citerefentry"><span class="refentrytitle">imageAtomicOr</span></span></a>,
<a class="citerefentry" href="imageAtomicAnd.xhtml"><span class="citerefentry"><span class="refentrytitle">imageAtomicAnd</span></span></a>,
<a class="citerefentry" href="imageAtomicExchange.xhtml"><span class="citerefentry"><span class="refentrytitle">imageAtomicExchange</span></span></a>,
<a class="citerefentry" href="imageAtomicCompSwap.xhtml"><span class="citerefentry"><span class="refentrytitle">imageAtomicCompSwap</span></span></a>,
<a class="citerefentry" href="groupMemoryBarrier.xhtml"><span class="citerefentry"><span class="refentrytitle">groupMemoryBarrier</span></span></a>,
<a class="citerefentry" href="memoryBarrierImage.xhtml"><span class="citerefentry"><span class="refentrytitle">memoryBarrierImage</span></span></a>,
<a class="citerefentry" href="memoryBarrierBuffer.xhtml"><span class="citerefentry"><span class="refentrytitle">memoryBarrierBuffer</span></span></a>,
<a class="citerefentry" href="memoryBarrierShared.xhtml"><span class="citerefentry"><span class="refentrytitle">memoryBarrierShared</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>
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