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+<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glXQueryContext</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glXQueryContext"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glXQueryContext — query context information</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">int <b class="fsfunc">glXQueryContext</b>(</code></td><td>Display * </td><td><var class="pdparam">dpy</var>, </td></tr><tr><td> </td><td>GLXContext </td><td><var class="pdparam">ctx</var>, </td></tr><tr><td> </td><td>int </td><td><var class="pdparam">attribute</var>, </td></tr><tr><td> </td><td>int * </td><td><var class="pdparam">value</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>dpy</code></em></span></dt><dd><p>
+ Specifies the connection to the X server.
+ </p></dd><dt><span class="term"><em class="parameter"><code>ctx</code></em></span></dt><dd><p>
+ Specifies a GLX rendering context.
+ </p></dd><dt><span class="term"><em class="parameter"><code>attribute</code></em></span></dt><dd><p>
+ Specifies that a context parameter should be retrieved. Must be one of
+ <code class="constant">GLX_FBCONFIG_ID</code>, <code class="constant">GLX_RENDER_TYPE</code>, or <code class="constant">GLX_SCREEN</code>.
+ </p></dd><dt><span class="term"><em class="parameter"><code>value</code></em></span></dt><dd><p>
+ Contains the return value for <em class="parameter"><code>attribute</code></em>.
+ </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
+ <code class="function">glXQueryContext</code> sets <em class="parameter"><code>value</code></em> to the value of <em class="parameter"><code>attribute</code></em> with respect to <em class="parameter"><code>ctx</code></em>.
+ <em class="parameter"><code>attribute</code></em> may be one of the following:
+ </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GLX_FBCONFIG_ID</code></span></dt><dd><p>
+ Returns the XID of the GLXFBConfig associated with <em class="parameter"><code>ctx</code></em>.
+ </p></dd><dt><span class="term"><code class="constant">GLX_RENDER_TYPE</code></span></dt><dd><p>
+ Returns the rendering type supported by <em class="parameter"><code>ctx</code></em>.
+ </p></dd><dt><span class="term"><code class="constant">GLX_SCREEN</code></span></dt><dd><p>
+ Returns the screen number associated with <em class="parameter"><code>ctx</code></em>.
+ </p></dd></dl></div><p>
+ <code class="constant">Success</code> is returned unless <em class="parameter"><code>attribute</code></em> is not a valid GLX
+ context attribute, in which case <code class="constant">GLX_BAD_ATTRIBUTE</code> is returned.
+ </p><p>
+ This call may cause a round-trip to the server.
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
+ <code class="function">glXQueryContext</code> is available only if the GLX version is 1.3 or greater.
+ </p><p>
+ If the GLX version is 1.1 or 1.0, the GL version must be 1.0.
+ If the GLX version is 1.2, then the GL version must be 1.1.
+ If the GLX version is 1.3, then the GL version must be 1.2.
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
+ <code class="constant">GLXBadContext</code> is generated if <em class="parameter"><code>ctx</code></em> does not
+ refer to a valid context.
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
+ <a class="citerefentry" href="glXCreateNewContext.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateNewContext</span></span></a>,
+ <a class="citerefentry" href="glXGetCurrentContext.xml"><span class="citerefentry"><span class="refentrytitle">glXGetCurrentContext</span></span></a>,
+ <a class="citerefentry" href="glXQueryVersion.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryVersion</span></span></a>,
+ <a class="citerefentry" href="glXQueryExtensionsString.xml"><span class="citerefentry"><span class="refentrytitle">glXQueryExtensionsString</span></span></a>
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
+ Copyright <span class="trademark"></span>© 1991-2006
+ Silicon Graphics, Inc. This document is licensed under the SGI
+ Free Software B License. For details, see
+ <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
+ </p></div></div></body></html>
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