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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="glFogCoord">
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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>glFogCoord</refentrytitle>
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        <manvolnum>3G</manvolnum>
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    </refmeta>
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    <refnamediv>
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        <refname>glFogCoord</refname>
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        <refpurpose>set the current fog coordinates</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>glFogCoordd</function></funcdef>
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                <paramdef>GLdouble <parameter>coord</parameter></paramdef>
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            </funcprototype>
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        </funcsynopsis>
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        <funcsynopsis>
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            <funcprototype>
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                <funcdef>void <function>glFogCoordf</function></funcdef>
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                <paramdef>GLfloat <parameter>coord</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>coord</parameter></term>
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            <listitem>
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                <para>
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                    Specify the fog distance.
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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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    <refsynopsisdiv><title>C Specification</title>
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        <funcsynopsis>
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            <funcprototype>
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                <funcdef>void <function>glFogCoorddv</function></funcdef>
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                <paramdef>GLdouble * <parameter>coord</parameter></paramdef>
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            </funcprototype>
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        </funcsynopsis>
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        <funcsynopsis>
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            <funcprototype>
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                <funcdef>void <function>glFogCoordfv</function></funcdef>
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                <paramdef>GLfloat * <parameter>coord</parameter></paramdef>
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            </funcprototype>
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        </funcsynopsis>
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    </refsynopsisdiv>
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    <refsect1 id="parameters2"><title>Parameters</title>
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        <variablelist>
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        <varlistentry>
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            <term><parameter>coord</parameter></term>
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            <listitem>
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                <para>
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                    Specifies a pointer to an array containing a single value representing the
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                    fog distance.
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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>glFogCoord</function> specifies the fog coordinate that is associated with each vertex and
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            the current raster position.  The value specified is interpolated and used
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            in computing the fog color (see <citerefentry><refentrytitle>glFog</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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            <function>glFogCoord</function> is available only if the GL version is 1.4 or greater.
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        </para>
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        <para>
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            The current fog coordinate can be updated at any time.  In particular,
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            <function>glFogCoord</function> can be called between a call to <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding
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            call to <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>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_FOG_COORD</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>glFog</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>glFogCoordPointer</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>glVertex</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>