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

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<div class="refnamediv">

<h2>Name</h2>

<p>gl_GlobalInvocationID — contains the global index of work item currently being operated on by a compute shader</p>

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<div class="refsynopsisdiv">

<h2>Declaration</h2>

<code class="fieldsynopsis"><span class="modifier">in </span><span class="type">uvec3 </span><span class="varname">gl_GlobalInvocationID </span>;</code>

</div>

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

<h2>Description</h2>

<p>

In the compute language, <code class="varname">gl_GlobalInvocationID</code>

is a derived input variable containing the n-dimensional index of the

work invocation within the global work group that the current shader is

executing on. The value of <code class="varname">gl_GlobalInvocationID</code> is equal to

<code class="varname">gl_WorkGroupID</code> * <code class="varname">gl_WorkGroupSize</code> + <code class="varname">gl_LocalInvocationID</code>.

</p>

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{$pipelinestall}{$examples}

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

<h2>Version Support</h2>

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<span class="bold"><strong>OpenGL Shading Language Version</strong></span>

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<span class="bold"><strong>Variable Name</strong></span>

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<span class="bold"><strong>1.10</strong></span>

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<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>

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<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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<span class="bold"><strong>4.20</strong></span>

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

<span class="bold"><strong>4.30</strong></span>

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

<span class="bold"><strong>4.40</strong></span>

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

<span class="bold"><strong>4.50</strong></span>

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

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</div>

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

<h2>See Also</h2>

<p>

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

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

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

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