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<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glClientActiveTexture</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glClientActiveTexture"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glClientActiveTexture — select client-side active texture unit</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glClientActiveTexture</strong>(</code></td><td>GLenum <var class="pdparam">texture</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">
                    <em class="parameter"><code>texture</code></em>
                </span></dt><dd><p>
                    Specifies which texture unit to make active. The
                    number of texture units is implementation dependent, but
                    must be at least two.
                    <em class="parameter"><code>texture</code></em> must be one of
                    <code class="constant">GL_TEXTURE</code><em class="replaceable"><code>i</code></em>,
                    <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                        <mml:mn>0</mml:mn>
                        <mml:mo>&lt;=</mml:mo>
                        <mml:mi>i</mml:mi>
                        <mml:mo>&lt;</mml:mo>
                        <mml:mi>GL_MAX_TEXTURE_UNITS</mml:mi>
                    </mml:math>,
                    which is an implementation-dependent value. The initial
                    value is <code class="constant">GL_TEXTURE0</code>.
                    </p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
        <code class="function">glClientActiveTexture</code>
        selects the vertex array client state parameters to be modified
        by
        <a class="citerefentry" href="glTexCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</span></span></a>,
        and enabled or disabled with
        <a class="citerefentry" href="glEnableClientState.xml"><span class="citerefentry"><span class="refentrytitle">glEnableClientState</span></span></a>
        or
        <a class="citerefentry" href="glDisableClientState.xml"><span class="citerefentry"><span class="refentrytitle">glDisableClientState</span></span></a>,
        respectively, when called with a parameter of
        <code class="constant">GL_TEXTURE_COORD_ARRAY</code>.</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
        <code class="constant">GL_INVALID_ENUM</code> is generated if
        <em class="parameter"><code>texture</code></em> is not one of
            <code class="constant">GL_TEXTURE</code><em class="replaceable"><code>i</code></em>,
            where
            <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <mml:mn>0</mml:mn>
                <mml:mo>&lt;=</mml:mo>
                <mml:mi>i</mml:mi>
                <mml:mo>&lt;</mml:mo>
                <mml:mi>GL_MAX_TEXTURE_UNITS</mml:mi>
            </mml:math>.
        </p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>It is always the case that
        <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
            <mml:mi>GL_TEXTURE</mml:mi><mml:mi>i</mml:mi> <mml:mo>=</mml:mo>
            <mml:mi>GL_TEXTURE0</mml:mi><mml:mo>+</mml:mo><mml:mi>i</mml:mi>
        </mml:math>.</p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
        <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>
        with argument <code class="constant">GL_CLIENT_ACTIVE_TEXTURE</code> or 
        <code class="constant">GL_MAX_TEXTURE_UNITS</code>
        </p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
        <a class="citerefentry" href="glActiveTexture.xml"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>,
        <a class="citerefentry" href="glEnableClientState.xml"><span class="citerefentry"><span class="refentrytitle">glEnableClientState</span></span></a>,
        <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>,
        <a class="citerefentry" href="glMultiTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glMultiTexCoord</span></span></a>,
        <a class="citerefentry" href="glTexCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</span></span></a>
        </p></div><div class="refsect1"><a id="copyright"></a><h2>Copyright</h2><p>
            Copyright <span class="trademark"></span>© 2003-2004
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
        </p></div></div></body></html>