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<refentry id="glXQueryVersion">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glXQueryVersion</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glXQueryVersion</refname>
        <refpurpose>return the version numbers of the GLX extension</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>Bool <function>glXQueryVersion</function></funcdef>
                <paramdef>Display * <parameter>dpy</parameter></paramdef>
                <paramdef>int * <parameter>major</parameter></paramdef>
                <paramdef>int * <parameter>minor</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <!-- eqn: ignoring delim $$ -->
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>dpy</parameter></term>
            <listitem>
                <para>
                    Specifies the connection to the X server.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>major</parameter></term>
            <listitem>
                <para>
                    Returns the major version number of the GLX server extension.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>minor</parameter></term>
            <listitem>
                <para>
                    Returns the minor version number of the GLX server extension.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glXQueryVersion</function> returns the major and minor version numbers of the GLX extension
            implemented by the server associated with connection <parameter>dpy</parameter>.
            Implementations with the same major version number are upward compatible,
            meaning that the implementation with the higher minor number is a superset
            of the version with the lower minor number.
        </para>
        <para>
            <parameter>major</parameter> and <parameter>minor</parameter> do not return values if they are specified as
            <constant>NULL</constant>. 
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <function>glXQueryVersion</function> returns <constant>False</constant> if it fails,
            <constant>True</constant> otherwise.
        </para>
        <para>
            <parameter>major</parameter> and <parameter>minor</parameter> are not updated when <constant>False</constant> is returned.
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glXQueryExtension</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>
