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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="gl_GlobalInvocationID">
    <info>
        <copyright>
            <year>2011-2014</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>gl_GlobalInvocationID</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>gl_GlobalInvocationID</refname>
        <refpurpose>contains the global index of work item currently being operated on by a compute shader</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Declaration</title>
        <fieldsynopsis>
            <modifier>in</modifier>
            <type>uvec3</type>
            <varname>gl_GlobalInvocationID</varname>
        </fieldsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            In the compute language, <varname>gl_GlobalInvocationID</varname>
            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 <varname>gl_GlobalInvocationID</varname> is equal to
            <varname>gl_WorkGroupID</varname> * <varname>gl_WorkGroupSize</varname> + <varname>gl_LocalInvocationID</varname>.
        </para>
    </refsect1>
    <refsect1 xml:id="versions">
        <title>Version Support</title>
        <informaltable>
            <tgroup cols="4" align="left">
                <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="funchead.xml" xpointer="xpointer(/*/*)"/>
                <tbody>
                    <row>
                        <entry><varname>gl_GlobalInvocationID</varname></entry>
                        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="version.xml" xpointer="xpointer(/*/*[@role='es31']/*)"/>
                    </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>
