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<refentry id="glEnableClientState">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glEnableClientState</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glEnableClientState</refname>
        <refpurpose>enable or disable client-side capability</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glEnableClientState</function></funcdef>
                <paramdef>GLenum <parameter>cap</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <!-- eqn: ignoring delim $$ -->
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>cap</parameter></term>
            <listitem>
                <para>
                    Specifies the capability to enable.
                    Symbolic constants
                    <constant>GL_COLOR_ARRAY</constant>,
                    <constant>GL_EDGE_FLAG_ARRAY</constant>,
                    <constant>GL_FOG_COORD_ARRAY</constant>,
                    <constant>GL_INDEX_ARRAY</constant>,
                    <constant>GL_NORMAL_ARRAY</constant>,
                    <constant>GL_SECONDARY_COLOR_ARRAY</constant>,
                    <constant>GL_TEXTURE_COORD_ARRAY</constant>, and
                    <constant>GL_VERTEX_ARRAY</constant>
                    are accepted.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glDisableClientState</function></funcdef>
                <paramdef>GLenum <parameter>cap</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters2"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>cap</parameter></term>
            <listitem>
                <para>
                    Specifies the capability to disable.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glEnableClientState</function> and <citerefentry><refentrytitle>glDisableClientState</refentrytitle></citerefentry>
            enable or disable individual client-side capabilities. By default, all
            client-side capabilities are disabled.
            Both
            <function>glEnableClientState</function> and <citerefentry><refentrytitle>glDisableClientState</refentrytitle></citerefentry> take a
            single argument, <parameter>cap</parameter>, which can assume one of the following
            values:
        </para>
        <variablelist>
            <varlistentry>
                <term><constant>GL_COLOR_ARRAY</constant></term>
                <listitem>
                    <para>
                        If enabled, the color array is enabled for writing and used during
                        rendering when <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
                        <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or
                        <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry> is called. See <citerefentry><refentrytitle>glColorPointer</refentrytitle></citerefentry>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GL_EDGE_FLAG_ARRAY</constant></term>
                <listitem>
                    <para>
                        If enabled, the edge flag array is enabled for writing and used during
                        rendering when <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
                        <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or
                        <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry> is called. See <citerefentry><refentrytitle>glEdgeFlagPointer</refentrytitle></citerefentry>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GL_FOG_COORD_ARRAY</constant></term>
                <listitem>
                    <para>
                        If enabled, the fog coordinate array is enabled for writing and used during
                        rendering when <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
                        <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or
                        <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry> is called. See <citerefentry><refentrytitle>glFogCoordPointer</refentrytitle></citerefentry>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GL_INDEX_ARRAY</constant></term>
                <listitem>
                    <para>
                        If enabled, the index array is enabled for writing and used during
                        rendering when <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
                        <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or
                        <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry> is called. See <citerefentry><refentrytitle>glIndexPointer</refentrytitle></citerefentry>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GL_NORMAL_ARRAY</constant></term>
                <listitem>
                    <para>
                        If enabled, the normal array is enabled for writing and used during
                        rendering when <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
                        <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or
                        <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry> is called. See <citerefentry><refentrytitle>glNormalPointer</refentrytitle></citerefentry>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GL_SECONDARY_COLOR_ARRAY</constant></term>
                <listitem>
                    <para>
                        If enabled, the secondary color array is enabled for writing and used
                        during rendering when <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
                        <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or
                        <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry> is called. See <citerefentry><refentrytitle>glColorPointer</refentrytitle></citerefentry>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GL_TEXTURE_COORD_ARRAY</constant></term>
                <listitem>
                    <para>
                        If enabled, the texture coordinate array is enabled for writing and used
                        during rendering when <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
                        <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or
                        <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry> is called. See <citerefentry><refentrytitle>glTexCoordPointer</refentrytitle></citerefentry>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term><constant>GL_VERTEX_ARRAY</constant></term>
                <listitem>
                    <para>
                        If enabled, the vertex array is enabled for writing and used during
                        rendering when <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
                        <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> <citerefentry><refentrytitle>glMultiDrawArrays</refentrytitle></citerefentry>, or
                        <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry> is called.  See <citerefentry><refentrytitle>glVertexPointer</refentrytitle></citerefentry>.
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para>
            <function>glEnableClientState</function> is available only if the GL version is 1.1 or greater.
        </para>
        <para>
            <constant>GL_FOG_COORD_ARRAY</constant> and <constant>GL_SECONDARY_COLOR_ARRAY</constant> are available only if the GL version is 1.4 or
            greater.
        </para>
        <para>
            For OpenGL versions 1.3 and greater, or when <code>ARB_multitexture</code> is supported, enabling and disabling
            <constant>GL_TEXTURE_COORD_ARRAY</constant> affects the active client texture unit.
            The active client texture unit is controlled with
            <citerefentry><refentrytitle>glClientActiveTexture</refentrytitle></citerefentry>.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>cap</parameter> is not an accepted value.
        </para>
        <para>
            <function>glEnableClientState</function> is not allowed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the
            corresponding <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>, but an error may or may not be generated. If
            no error is generated, the behavior is undefined.
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glArrayElement</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glClientActiveTexture</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glColorPointer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glEdgeFlagPointer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glFogCoordPointer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGetPointerv</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glIndexPointer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glInterleavedArrays</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glNormalPointer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glSecondaryColorPointer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glTexCoordPointer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glVertexPointer</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>