<div class="refentry" id="memoryBarrier">

<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">

<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>

{$pipelinestall}{$examples}

<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; " 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="3">

<span class="bold"><strong>OpenGL ES 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>1.00</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.00</strong></span>

</th>

<th style="text-align: center; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.10</strong></span>

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; ">

<code class="function">memoryBarrier</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; ">✔</td>

</tr>

</tbody>

</table>

</div>

</div>

<div class="refsect1" id="seealso">

<h2>See Also</h2>

<p>

<a class="citerefentry" href="imageLoad"><span class="citerefentry"><span class="refentrytitle">imageLoad</span></span></a>,

<a class="citerefentry" href="imageStore"><span class="citerefentry"><span class="refentrytitle">imageStore</span></span></a>,

<a class="citerefentry" href="imageAtomicAdd"><span class="citerefentry"><span class="refentrytitle">imageAtomicAdd</span></span></a>,

<a class="citerefentry" href="imageAtomicMin"><span class="citerefentry"><span class="refentrytitle">imageAtomicMin</span></span></a>,

<a class="citerefentry" href="imageAtomicMax"><span class="citerefentry"><span class="refentrytitle">imageAtomicMax</span></span></a>,

<a class="citerefentry" href="imageAtomicXor"><span class="citerefentry"><span class="refentrytitle">imageAtomicXor</span></span></a>,

<a class="citerefentry" href="imageAtomicOr"><span class="citerefentry"><span class="refentrytitle">imageAtomicOr</span></span></a>,

<a class="citerefentry" href="imageAtomicAnd"><span class="citerefentry"><span class="refentrytitle">imageAtomicAnd</span></span></a>,

<a class="citerefentry" href="imageAtomicExchange"><span class="citerefentry"><span class="refentrytitle">imageAtomicExchange</span></span></a>,

<a class="citerefentry" href="imageAtomicCompSwap"><span class="citerefentry"><span class="refentrytitle">imageAtomicCompSwap</span></span></a>,

<a class="citerefentry" href="memoryBarrier"><span class="citerefentry"><span class="refentrytitle">memoryBarrier</span></span></a>

</p>

</div>

<div class="refsect1" id="Copyright">

<h2>Copyright</h2>

<p>

Copyright © 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="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.

</p>

</div>

</div>