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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="gl_LocalInvocationIndex">
<info>
<copyright>
<year>2012-2014</year>
<holder>Khronos Group</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>gl_LocalInvocationIndex</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>gl_LocalInvocationIndex</refname>
<refpurpose>contains the local linear index of work item currently being operated on by a compute shader</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Declaration</title>
<fieldsynopsis>
<modifier>in</modifier>
<type>uint</type>
<varname>gl_LocalInvocationIndex</varname>
</fieldsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="description"><title>Description</title>
<para>
In the compute language, <varname>gl_LocalInvocationIndex</varname>
is a derived input variable containing the 1-dimensional linearized index of the
work invocation within the work group that the current shader is
executing on. The value of <varname>gl_LocalInvocationIndex</varname> is equal to
<varname>gl_LocalInvocationID.z</varname> * <varname>gl_WorkGroupSize.x</varname> * <varname>gl_WorkGroupSize.y</varname> +
<varname>gl_LocalInvocationID.y</varname> * <varname>gl_WorkGroupSize.x</varname> +
<varname>gl_LocalInvocationID.x</varname>.
</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_LocalInvocationIndex</entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="version.xml" xpointer="xpointer(/*/*[@role='43']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>gl_NumWorkGroups</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>gl_WorkGroupID</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>gl_WorkGroupSize</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>gl_LocalInvocationID</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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