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144 lines
6.1 KiB
XML
144 lines
6.1 KiB
XML
<?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="glXQueryContextInfoEXT">
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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>glXQueryContextInfoEXT</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glXQueryContextInfoEXT</refname>
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<refpurpose>query context information</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>int <function>glXQueryContextInfoEXT</function></funcdef>
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<paramdef>Display * <parameter>dpy</parameter></paramdef>
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<paramdef>GLXContext <parameter>ctx</parameter></paramdef>
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<paramdef>int <parameter>attribute</parameter></paramdef>
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<paramdef>int * <parameter>value</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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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>dpy</parameter></term>
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<listitem>
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<para>
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Specifies the connection to the X server.
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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>ctx</parameter></term>
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<listitem>
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<para>
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Specifies a GLX rendering context.
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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>attribute</parameter></term>
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<listitem>
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<para>
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Specifies that a context parameter should be retrieved. Must be one of
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<constant>GLX_SHARED_CONTEXT_EXT</constant>, <constant>GLX_VISUAL_ID_EXT</constant>, or <constant>GLX_SCREEN_EXT</constant>.
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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>value</parameter></term>
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<listitem>
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<para>
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Contains the return value for <parameter>attribute</parameter>.
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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>glXQueryContextInfoEXT</function> sets <parameter>value</parameter> to the value of <parameter>attribute</parameter> with respect to <parameter>ctx</parameter>.
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<function>glXQueryContextInfoEXT</function> returns an error code if it fails for any reason. Otherwise,
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<constant>Success</constant> is returned.
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</para>
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<para>
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<parameter>attribute</parameter> may be one of the following:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GLX_SHARED_CONTEXT_EXT</constant></term>
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<listitem>
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<para>
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Returns the XID of the share list context associated with <parameter>ctx</parameter> at its
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creation.
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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><constant>GLX_VISUAL_ID_EXT</constant></term>
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<listitem>
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<para>
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Returns the XID of the GLX Visual associated with <parameter>ctx</parameter>.
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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><constant>GLX_SCREEN_EXT</constant></term>
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<listitem>
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<para>
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Returns the screen number associated with <parameter>ctx</parameter>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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This call may cause a round-trip to the server.
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</para>
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<para>
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<function>glXQueryContextInfoEXT</function> is part of the <code>EXT_import_context</code> extension,
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not part of the core GLX command set. If _glxextstring(EXT_import_context)
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is included in the string returned by <citerefentry><refentrytitle>glXQueryExtensionsString</refentrytitle></citerefentry>,
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when called with argument <constant>GLX_EXTENSIONS</constant>,
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extension <code>EXT_import_context</code> is supported.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GLXBadContext</constant> is generated if <parameter>ctx</parameter> does not
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refer to a valid context.
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</para>
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<para>
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<constant>GLX_BAD_ATTRIBUTE</constant> is returned if <parameter>attribute</parameter> is not a valid GLX
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context attribute.
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</para>
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<para>
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fred <constant>GLX_BAD_CONTEXT</constant> is returned if <parameter>attribute</parameter> is not a valid context.
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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>glXCreateContext</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXQueryVersion</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXQueryExtensionsString</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>
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