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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
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3 | <?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 V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glCullFace"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glCullFace — specify whether front- or back-facing facets can be culled</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glCullFace</b>(</code></td><td>GLenum </td><td><var class="pdparam">mode</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>mode</code></em></span></dt><dd><p> | |
4 | Specifies whether front- or back-facing facets are candidates for culling. | |
5 | Symbolic constants | |
6 | <code class="constant">GL_FRONT</code>, <code class="constant">GL_BACK</code>, and <code class="constant">GL_FRONT_AND_BACK</code> are accepted. | |
7 | The initial value is <code class="constant">GL_BACK</code>. | |
8 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
9 | <code class="function">glCullFace</code> specifies whether front- or back-facing facets are culled | |
10 | (as specified by <span class="emphasis"><em>mode</em></span>) when facet culling is enabled. Facet | |
11 | culling is initially disabled. | |
12 | To enable and disable facet culling, call the | |
13 | <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> commands | |
14 | with the argument <code class="constant">GL_CULL_FACE</code>. | |
15 | Facets include triangles, | |
16 | quadrilaterals, | |
17 | polygons, and | |
18 | rectangles. | |
19 | </p><p> | |
20 | <a class="citerefentry" href="glFrontFace.xml"><span class="citerefentry"><span class="refentrytitle">glFrontFace</span></span></a> specifies which of the clockwise and counterclockwise facets | |
21 | are front-facing and back-facing. | |
22 | See <a class="citerefentry" href="glFrontFace.xml"><span class="citerefentry"><span class="refentrytitle">glFrontFace</span></span></a>. | |
23 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
24 | If <em class="parameter"><code>mode</code></em> is <code class="constant">GL_FRONT_AND_BACK</code>, no facets are drawn, but other | |
25 | primitives such as points and lines are drawn. | |
26 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
27 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>mode</code></em> is not an accepted value. | |
28 | </p><p> | |
29 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glCullFace</code> | |
30 | is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> | |
31 | and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
32 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
33 | <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> | |
34 | </p><p> | |
35 | <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> | |
36 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
37 | <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>, | |
38 | <a class="citerefentry" href="glFrontFace.xml"><span class="citerefentry"><span class="refentrytitle">glFrontFace</span></span></a> | |
39 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
40 | Copyright <span class="trademark"></span>© 1991-2006 | |
41 | Silicon Graphics, Inc. This document is licensed under the SGI | |
42 | Free Software B License. For details, see | |
43 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
44 | </p></div></div></body></html> |