rename upstream-man-pages to upstream-doc

[clinton/guile-figl.git] / upstream-man-pages / man3 / glFrontFace.xml

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-<?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="glFrontFace">
-    <refmeta>
-        <refmetainfo>
-            <copyright>
-                <year>1991-2006</year>
-                <holder>Silicon Graphics, Inc.</holder>
-            </copyright>
-        </refmetainfo>
-        <refentrytitle>glFrontFace</refentrytitle>
-        <manvolnum>3G</manvolnum>
-    </refmeta>
-    <refnamediv>
-        <refname>glFrontFace</refname>
-        <refpurpose>define front- and back-facing polygons</refpurpose>
-    </refnamediv>
-    <refsynopsisdiv><title>C Specification</title>
-        <funcsynopsis>
-            <funcprototype>
-                <funcdef>void <function>glFrontFace</function></funcdef>
-                <paramdef>GLenum <parameter>mode</parameter></paramdef>
-            </funcprototype>
-        </funcsynopsis>
-    </refsynopsisdiv>
-    <!-- eqn: ignoring delim $$ -->
-    <refsect1 id="parameters"><title>Parameters</title>
-        <variablelist>
-        <varlistentry>
-            <term><parameter>mode</parameter></term>
-            <listitem>
-                <para>
-                    Specifies the orientation of front-facing polygons.
-                    <constant>GL_CW</constant> and <constant>GL_CCW</constant> are accepted.
-                    The initial value is <constant>GL_CCW</constant>.
-                </para>
-            </listitem>
-        </varlistentry>
-        </variablelist>
-    </refsect1>
-    <refsect1 id="description"><title>Description</title>
-        <para>
-            In a scene composed entirely of opaque closed surfaces,
-            back-facing polygons are never visible.
-            Eliminating these invisible polygons has the obvious benefit
-            of speeding up the rendering of the image.
-            To enable and disable elimination of back-facing polygons, call <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
-            and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry> with argument <constant>GL_CULL_FACE</constant>.
-        </para>
-        <para>
-            The projection of a polygon to window coordinates is said to have
-            clockwise winding if an imaginary object following the path
-            from its first vertex,
-            its second vertex,
-            and so on,
-            to its last vertex,
-            and finally back to its first vertex,
-            moves in a clockwise direction about the interior of the polygon.
-            The polygon's winding is said to be counterclockwise if the imaginary
-            object following the same path moves in a counterclockwise direction
-            about the interior of the polygon.
-            <function>glFrontFace</function> specifies whether polygons with clockwise winding in window coordinates,
-            or counterclockwise winding in window coordinates,
-            are taken to be front-facing.
-            Passing <constant>GL_CCW</constant> to <parameter>mode</parameter> selects counterclockwise polygons as
-            front-facing;
-            <constant>GL_CW</constant> selects clockwise polygons as front-facing.
-            By default, counterclockwise polygons are taken to be front-facing.
-        </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>
-    </refsect1>
-    <refsect1 id="associatedgets"><title>Associated Gets</title>
-        <para>
-            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_FRONT_FACE</constant>
-        </para>
-    </refsect1>
-    <refsect1 id="seealso"><title>See Also</title>
-        <para>
-            <citerefentry><refentrytitle>glCullFace</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>