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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="gl_PointCoord">
    <info>
        <copyright>
            <year>2011-2013</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>gl_PointCoord</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>gl_PointCoord</refname>
        <refpurpose>contains the coordinate of a fragment within a point</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Declaration</title>
        <fieldsynopsis>
            <modifier>in</modifier>
            <type>vec2</type>
            <varname>gl_PointCoord</varname>
        </fieldsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            <varname>gl_PointCoord</varname> is a fragment language input variable that contains
            the two-dimensional coordinates indicating where within a point primitive the current
            fragment is located. If the current primitive is not a point, then values read
            from <varname>gl_PointCoord</varname> are undefined.
        </para>
        <para>
            <varname>gl_PointCoord.s</varname> ranges from 0.0 to 1.0 across the point horizontally
            from left to right. If <constant>GL_POINT_SPRITE_COORD_ORIGIN</constant> is
            <constant>GL_LOWER_LEFT</constant>, <varname>gl_PointCoord.t</varname> varies
            from 0.0 to 1.0 vertically from bottom to top. Otherwise, if <constant>GL_POINT_SPRITE_COORD_ORIGIN</constant>
            is <constant>GL_UPPER_LEFT</constant> then <varname>gl_PointCoord.t</varname> varies
            from 0.0 to 1.0 vertically from top to bottom. The default value of <constant>GL_POINT_SPRITE_COORD_ORIGIN</constant>
            is <constant>GL_UPPER_LEFT</constant>.
        </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="varhead.xml" xpointer="xpointer(/*/*)"/>
                <tbody>
                    <row>
                        <entry>gl_PointCoord</entry>
                        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="version.xml" xpointer="xpointer(/*/*[@role='11']/*)"/>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>gl_FragCoord</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>gl_FragDepth</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>
