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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="gl_TessLevelInner">
    <info>
        <copyright>
            <year>2011-2013</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>gl_TessLevelInner</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>gl_TessLevelInner</refname>
        <refpurpose>contains the inner tessellation levels for the current patch</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Declaration</title>
        <para>
            <programlisting>// In tessellation control shaders</programlisting>
            <fieldsynopsis>
                <modifier>out</modifier>
                <type>float</type>
                <varname>gl_TessLevelInner[2]</varname>
            </fieldsynopsis>
        </para>
        <para>
            <programlisting>// In tessellation evaluation shaders</programlisting>
            <fieldsynopsis>
                <modifier>in</modifier>
                <type>float</type>
                <varname>gl_TessLevelInner[2]</varname>
            </fieldsynopsis>
        </para>
    </refsynopsisdiv>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            Available only in the tessellation control and evaluation languages, <varname>gl_TessLevelInner</varname>
            is used to assign values to the corresponding inner tesellation levels of the current patch. The values written
            into <varname>gl_TessLevelInner</varname> by the tessellation control shader are used by the tessellation
            primitive generator to control primitive tessellation and may be read by the subsequent tessellation evaluation shader.
        </para>
        <para>
            As inputs to the tessellation evaluation shader, <varname>gl_TessLevelInner</varname> contains the values
            written by the tessellation control shader, if present. If no tessellation control shader is present, it
            contains the default tessellation level.
        </para>
    </refsect1>
    <refsect1 xml:id="versions"><title>Version Support</title>
        <informaltable>
            <tgroup cols="11" align="left">
                <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="funchead.xml" xpointer="xpointer(/*/*)"/>
                <tbody>
                    <row>
                        <entry>gl_TessLevelInner</entry>
                        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="version.xml" xpointer="xpointer(/*/*[@role='40']/*)"/>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>gl_TessLevelOuter</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>gl_TessCoord</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 xml:id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"/> 2011-2013 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>
