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