
<refentry id="glXQueryDrawable">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glXQueryDrawable</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glXQueryDrawable</refname>
        <refpurpose>returns an attribute assoicated with a GLX drawable</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>int <function>glXQueryDrawable</function></funcdef>
                <paramdef>Display * <parameter>dpy</parameter></paramdef>
                <paramdef>GLXDrawable <parameter>draw</parameter></paramdef>
                <paramdef>int <parameter>attribute</parameter></paramdef>
                <paramdef>unsigned int * <parameter>value</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>draw</parameter></term>
            <listitem>
                <para>
                    Specifies the GLX drawable to be queried.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>attribute</parameter></term>
            <listitem>
                <para>
                    Specifies the attribute to be returned.  Must be one of
                    <constant>GLX_WIDTH</constant>,
					<constant>GLX_HEIGHT</constant>,
					<constant>GLX_PRESERVED_CONTENTS</constant>,
					<constant>GLX_LARGEST_PBUFFER</constant>, or
					<constant>GLX_FBCONFIG_ID</constant>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>value</parameter></term>
            <listitem>
                <para>
                    Contains the return value for
					<parameter>attribute</parameter>. 
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glXQueryDrawable</function> sets
			<parameter>value</parameter> to the value of
			<parameter>attribute</parameter> with respect to the GLXDrawable
			<parameter>draw</parameter>.
		</para>
		<para>
            <parameter>attribute</parameter> may be one of the following:
        </para>
        <variablelist>
            <varlistentry>
                <term><constant>GLX_WIDTH</constant></term>
                <listitem>
                    <para>
                        Returns the width of <parameter>ctx</parameter>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GLX_HEIGHT</constant></term>
                <listitem>
                    <para>
                        Returns the height of <parameter>ctx</parameter>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GLX_PRESERVED_CONTENTS</constant></term>
                <listitem>
                    <para>
                        Returns <constant>True</constant> if the contents
						of a GLXPbuffer are preserved when a resource
						conflict occurs; <constant>False</constant> otherwise.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GLX_LARGEST_PBUFFER</constant></term>
                <listitem>
                    <para>
                        Returns the value set when
                        <function>glXCreatePbuffer</function> was called to
                        create the GLXPbuffer. If
                        <constant>False</constant> is returned, then the
                        call to <function>glXCreatePbuffer</function> will
                        fail to create a GLXPbuffer if the requested size
                        is larger than the implementation maximum or
                        available resources.  If <constant>True</constant>
                        is returned, a GLXPbuffer of the maximum availble
                        size (if less than the requested width and height)
                        is created.
                    </para>
                </listitem>
            </varlistentry>
			<varlistentry>
			    <term><constant>GLX_FBCONFIG_ID</constant></term>
				<listitem>
				    <para>
					    Returns the XID for <parameter>draw</parameter>.
					</para>
				</listitem>
			</varlistentry>
        </variablelist>
        <para>
            If <parameter>draw</parameter> is a GLXWindow or GLXPixmap and
            <parameter>attribute</parameter> is set to
            <constant>GLX_PRESERVED_CONTENTS</constant> or
            <constant>GLX_LARGETST_PBUFFER</constant>, the contents of
            <parameter>value</parameter> are undefined.  If
            <parameter>attribute</parameter> is not one of the attributes
            listed above, the contents of <parameter>value</parameter> are
            unedfined.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            A <constant>GLXBadDrawable</constant> is generated if
			<parameter>draw</parameter> is not a valid GLXDrawable.
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
		    <citerefentry><refentrytitle>glXCreateWindow</refentrytitle></citerefentry>,
			<citerefentry><refentrytitle>glXCreatePixmap</refentrytitle></citerefentry>,
			<citerefentry><refentrytitle>glXCreatePbuffer</refentrytitle></citerefentry>,
			<citerefentry><refentrytitle>glXGetFBConfigAttrib</refentrytitle></citerefentry>,
			<citerefentry><refentrytitle>glXChooseFBConfig</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>
