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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="gluCheckExtension">
<refmeta>
<refmetainfo>
<copyright>
<year>1991-2006</year>
<holder>Silicon Graphics, Inc.</holder>
</copyright>
</refmetainfo>
<refentrytitle>gluCheckExtension</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>gluCheckExtension</refname>
<refpurpose>determines if an extension name is supported</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>GLboolean <function>gluCheckExtension</function></funcdef>
<paramdef>const GLubyte * <parameter>extName</parameter></paramdef>
<paramdef>const GLubyte * <parameter>extString</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>extName</parameter></term>
<listitem>
<para>
Specifies an extension name.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>extString</parameter></term>
<listitem>
<para>
Specifies a space-separated list of extension names supported.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
<function>gluCheckExtension</function> returns <constant>GLU_TRUE</constant> if <parameter>extName</parameter> is supported otherwise
<constant>GLU_FALSE</constant> is returned.
</para>
<para>
This is used to check for the presence for OpenGL, GLU, or GLX extension names
by passing the extension strings returned by <citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>gluGetString</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glXGetClientString</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glXQueryExtensionsString</refentrytitle></citerefentry>, or <citerefentry><refentrytitle>glXQueryServerString</refentrytitle></citerefentry>,
respectively, as <parameter>extString</parameter>.
</para>
</refsect1>
<refsect1 id="notes"><title>Notes</title>
<para>
Cases where one extension name is a substring of another are
correctly handled.
</para>
<para>
There may or may not be leading or trailing blanks in <parameter>extString</parameter>.
</para>
<para>
Extension names should not contain embedded spaces.
</para>
<para>
All strings are null-terminated.
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>gluGetString</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glXGetClientString</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glXQueryExtensionsString</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glXQueryServerString</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>