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207 lines
8.3 KiB
XML
207 lines
8.3 KiB
XML
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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glIsEnabled">
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<info>
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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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<copyright>
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<year>2010-2014</year>
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<holder>Khronos Group</holder>
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</copyright>
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</info>
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<refmeta>
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<refentrytitle>glIsEnabled</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glIsEnabled</refname>
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<refpurpose>test whether a capability is enabled</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>GLboolean <function>glIsEnabled</function></funcdef>
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<paramdef>GLenum <parameter>cap</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 xml:id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>cap</parameter></term>
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<listitem>
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<para>
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Specifies a symbolic constant indicating a GL capability.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>index</parameter></term>
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<listitem>
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<para>
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Specifies the index of the capability.
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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 xml:id="description"><title>Description</title>
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<para>
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<function>glIsEnabled</function> returns <constant>GL_TRUE</constant> if <parameter>cap</parameter> is an enabled capability
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and returns <constant>GL_FALSE</constant> otherwise. Initially all capabilities except <constant>GL_DITHER</constant> are disabled;
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<constant>GL_DITHER</constant> is initially enabled.
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</para>
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<para>
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The following capabilities are accepted for <parameter>cap</parameter>:
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</para>
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<para>
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</para>
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<informaltable>
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<tgroup cols="2" align="left">
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<colspec/>
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<colspec/>
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<thead>
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<row>
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<entry>
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<emphasis role="bold"> Constant </emphasis>
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</entry>
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<entry>
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<emphasis role="bold"> See </emphasis>
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</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>
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<constant>GL_BLEND</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_CULL_FACE</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_DEPTH_TEST</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDepthRangef</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_DITHER</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_POLYGON_OFFSET_FILL</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_PRIMITIVE_RESTART_FIXED_INDEX</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_SAMPLE_ALPHA_TO_COVERAGE</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_SAMPLE_COVERAGE</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_SCISSOR_TEST</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>
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</entry>
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</row>
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<row>
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<entry>
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<constant>GL_STENCIL_TEST</constant>
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</entry>
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<entry>
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<citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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</para>
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</refsect1>
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<refsect1 xml:id="notes"><title>Notes</title>
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<para>
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If an error is generated,
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<function>glIsEnabled</function> returns <constant>GL_FALSE</constant>.
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</para>
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</refsect1>
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<refsect1 xml:id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>cap</parameter> is not an accepted value.
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</para>
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</refsect1>
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<refsect1 xml:id="versions">
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<title>API Version Support</title>
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<informaltable>
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<tgroup cols="4" align="left">
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
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<tbody>
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<row>
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<entry>glIsEnabled</entry>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 xml: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>glDisable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 1991-2006 Silicon Graphics, Inc.
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Copyright <trademark class="copyright"/> 2010-2014 Khronos Group.
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This document is licensed under the SGI Free Software B License.
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For details, see
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</link>.
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</para>
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</refsect1>
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</refentry>
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