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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
<!-- Converted by db4-upgrade version 1.1 -->
<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="gl_InvocationID">
<info>
<copyright>
<year>2011-2014</year>
<holder>Khronos Group</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>gl_InvocationID</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>gl_InvocationID</refname>
<refpurpose>contains the invocation index of the current shader</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Declaration</title>
<fieldsynopsis>
<modifier>in</modifier>
<type>int</type>
<varname>gl_InvocationID</varname>
</fieldsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="description"><title>Description</title>
<para>
In the tessellation control language, <varname>gl_InvocationID</varname>
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.
</para>
<para>
In the geometry language, <varname>gl_InvocationID</varname> 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.
</para>
</refsect1>
<refsect1 xml:id="versions"><title>Version Support</title>
<informaltable>
<tgroup cols="13" align="left">
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="varhead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry>gl_InvocationID</entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="version.xml" xpointer="xpointer(/*/*[@role='15']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
<para>[1] Versions 1.50 to 3.30 - geometry shaders only.</para>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>gl_InstanceID</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 xml:id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="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.
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
</para>
</refsect1>
</refentry>
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