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<title>gl_InvocationID - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="gl_InvocationID">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>gl_InvocationID — contains the invocation index of the current shader</p>
</div>
<div class="refsynopsisdiv">
<h2>Declaration</h2>
<code class="fieldsynopsis"><span class="modifier">in </span><span class="type">int </span><span class="varname">gl_InvocationID </span>;</code>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
In the tessellation control language, <code class="varname">gl_InvocationID</code>
contains the index of the output patch vertex assigned to the shader invocation.
It is assigned an integer value in the range [0, N-1] where N is the number of output
patch vertices.
</p>
<p>
In the geometry language, <code class="varname">gl_InvocationID</code> identifies
the invocation number assigned to the geometry shader invocation. It is assigned
an integer value in the range [0, N-1] where N is the number of geometry shader
invocations per primitive.
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
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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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<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>
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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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<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_InvocationID</td>
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<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; ">✔</td>
</tr>
</tbody>
</table>
</div>
<p>[1] Versions 1.50 to 3.30 - geometry shaders only.</p>
</div>
<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="gl_InstanceID.xhtml"><span class="citerefentry"><span class="refentrytitle">gl_InstanceID</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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