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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>glCullFace</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glCullFace"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCullFace — specify whether front- or back-facing polygons are
        culled</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">glCullFace</strong>(</code></td><td>GLenum <var class="pdparam">mode</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>mode</code></em>
                </span></dt><dd><p>Specifies whether front- or back-facing polygons are
                    culled. Symbolic constants
                    <code class="constant">GL_FRONT</code>,
                    <code class="constant">GL_BACK</code>, and
                    <code class="constant">GL_FRONT_AND_BACK</code>
                    are accepted. The initial value is
                    <code class="constant">GL_BACK</code>.</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
        <code class="function">glCullFace</code>
        specifies whether front- or back-facing polygons are culled (as
        specified by <em class="parameter"><code>mode</code></em>)
        when culling is enabled.
        To enable and disable culling, call
        <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
        and
        <a class="citerefentry" href="glDisable.xml"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a>
        with argument <code class="constant">GL_CULL_FACE</code>.
        Culling is initially disabled.
        </p><p>
        <a class="citerefentry" href="glFrontFace.xml"><span class="citerefentry"><span class="refentrytitle">glFrontFace</span></span></a>
        specifies which of the clockwise and counterclockwise polygons
        are front-facing and back-facing.</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>If <em class="parameter"><code>mode</code></em> is
        <code class="constant">GL_FRONT_AND_BACK</code>,
        no polygons are drawn, but other primitives such as points and
        lines are drawn.</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>mode</code></em> is not an accepted value.</p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
            <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_CULL_FACE</code>
        </p><p>
            <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_CULL_FACE_MODE</code>
        </p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
        <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
        <a class="citerefentry" href="glFrontFace.xml"><span class="citerefentry"><span class="refentrytitle">glFrontFace</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>