139 lines
5.7 KiB
XML
139 lines
5.7 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="glXQueryContext">
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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>glXQueryContext</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glXQueryContext</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>glXQueryContext</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_FBCONFIG_ID</constant>, <constant>GLX_RENDER_TYPE</constant>, or <constant>GLX_SCREEN</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>glXQueryContext</function> sets <parameter>value</parameter> to the value of <parameter>attribute</parameter> with respect to <parameter>ctx</parameter>.
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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_FBCONFIG_ID</constant></term>
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<listitem>
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<para>
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Returns the XID of the GLXFBConfig 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_RENDER_TYPE</constant></term>
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<listitem>
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<para>
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Returns the rendering type supported by <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</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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<constant>Success</constant> is returned unless <parameter>attribute</parameter> is not a valid GLX
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context attribute, in which case <constant>GLX_BAD_ATTRIBUTE</constant> is returned.
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</para>
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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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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glXQueryContext</function> is available only if the GLX version is 1.3 or greater.
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</para>
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<para>
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If the GLX version is 1.1 or 1.0, the GL version must be 1.0.
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If the GLX version is 1.2, then the GL version must be 1.1.
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If the GLX version is 1.3, then the GL version must be 1.2.
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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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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glXCreateNewContext</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glXGetCurrentContext</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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