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100 lines
4.5 KiB
XML
100 lines
4.5 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glCullFace">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glCullFace</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glCullFace</refname>
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<refpurpose>specify whether front- or back-facing facets can be culled</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glCullFace</function></funcdef>
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<paramdef>GLenum <parameter>mode</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>mode</parameter></term>
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<listitem>
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<para>
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Specifies whether front- or back-facing facets are candidates for culling.
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Symbolic constants
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<constant>GL_FRONT</constant>, <constant>GL_BACK</constant>, and <constant>GL_FRONT_AND_BACK</constant> are accepted.
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The initial value is <constant>GL_BACK</constant>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glCullFace</function> specifies whether front- or back-facing facets are culled
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(as specified by <emphasis>mode</emphasis>) when facet culling is enabled. Facet
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culling is initially disabled.
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To enable and disable facet culling, call the
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<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry> commands
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with the argument <constant>GL_CULL_FACE</constant>.
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Facets include triangles,
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quadrilaterals,
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polygons, and
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rectangles.
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</para>
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<para>
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<citerefentry><refentrytitle>glFrontFace</refentrytitle></citerefentry> specifies which of the clockwise and counterclockwise facets
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are front-facing and back-facing.
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See <citerefentry><refentrytitle>glFrontFace</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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If <parameter>mode</parameter> is <constant>GL_FRONT_AND_BACK</constant>, no facets are drawn, but other
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primitives such as points and lines are drawn.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>mode</parameter> is not an accepted value.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glCullFace</function>
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is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_CULL_FACE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CULL_FACE_MODE</constant>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glFrontFace</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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