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<refentry id="gluCheckExtension">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>gluCheckExtension</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>gluCheckExtension</refname>
        <refpurpose>determines if an extension name is supported</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>GLboolean <function>gluCheckExtension</function></funcdef>
                <paramdef>const GLubyte * <parameter>extName</parameter></paramdef>
                <paramdef>const GLubyte * <parameter>extString</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>extName</parameter></term>
            <listitem>
                <para>
                    Specifies an extension name.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>extString</parameter></term>
            <listitem>
                <para>
                    Specifies a space-separated list of extension names supported. 
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>gluCheckExtension</function> returns <constant>GLU_TRUE</constant> if <parameter>extName</parameter> is supported otherwise 
            <constant>GLU_FALSE</constant> is returned.
        </para>
        <para>
            This is used to check for the presence for OpenGL, GLU, or GLX extension names
            by passing the extension strings returned by <citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>gluGetString</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glXGetClientString</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glXQueryExtensionsString</refentrytitle></citerefentry>, or <citerefentry><refentrytitle>glXQueryServerString</refentrytitle></citerefentry>,
            respectively, as <parameter>extString</parameter>.
        </para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para>
            Cases where one extension name is a substring of another are
            correctly handled.
        </para>
        <para>
            There may or may not be leading or trailing blanks in <parameter>extString</parameter>.
        </para>
        <para>
            Extension names should not contain embedded spaces.
        </para>
        <para>
            All strings are null-terminated.
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>gluGetString</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glXGetClientString</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glXQueryExtensionsString</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glXQueryServerString</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"></trademark> 1991-2006
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
        </para>
    </refsect1>
</refentry>
