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"text/html; charset=UTF-8" /><title>glXQueryContextInfoEXT
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glXQueryContextInfoEXT"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glXQueryContextInfoEXT — 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">glXQueryContextInfoEXT
</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>
4 Specifies the connection to the X server.
5 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>ctx
</code></em></span></dt><dd><p>
6 Specifies a GLX rendering context.
7 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>attribute
</code></em></span></dt><dd><p>
8 Specifies that a context parameter should be retrieved. Must be one of
9 <code class=
"constant">GLX_SHARED_CONTEXT_EXT
</code>,
<code class=
"constant">GLX_VISUAL_ID_EXT
</code>, or
<code class=
"constant">GLX_SCREEN_EXT
</code>.
10 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>value
</code></em></span></dt><dd><p>
11 Contains the return value for
<em class=
"parameter"><code>attribute
</code></em>.
12 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
13 <code class=
"function">glXQueryContextInfoEXT
</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>.
14 <code class=
"function">glXQueryContextInfoEXT
</code> returns an error code if it fails for any reason. Otherwise,
15 <code class=
"constant">Success
</code> is returned.
17 <em class=
"parameter"><code>attribute
</code></em> may be one of the following:
18 </p><div class=
"variablelist"><dl><dt><span class=
"term"><code class=
"constant">GLX_SHARED_CONTEXT_EXT
</code></span></dt><dd><p>
19 Returns the XID of the share list context associated with
<em class=
"parameter"><code>ctx
</code></em> at its
21 </p></dd><dt><span class=
"term"><code class=
"constant">GLX_VISUAL_ID_EXT
</code></span></dt><dd><p>
22 Returns the XID of the GLX Visual associated with
<em class=
"parameter"><code>ctx
</code></em>.
23 </p></dd><dt><span class=
"term"><code class=
"constant">GLX_SCREEN_EXT
</code></span></dt><dd><p>
24 Returns the screen number associated with
<em class=
"parameter"><code>ctx
</code></em>.
25 </p></dd></dl></div><p>
26 This call may cause a round-trip to the server.
28 <code class=
"function">glXQueryContextInfoEXT
</code> is part of the
<code class=
"code">EXT_import_context
</code> extension,
29 not part of the core GLX command set. If _glxextstring(EXT_import_context)
30 is included in the string returned by
<a class=
"citerefentry" href=
"glXQueryExtensionsString.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glXQueryExtensionsString
</span></span></a>,
31 when called with argument
<code class=
"constant">GLX_EXTENSIONS
</code>,
32 extension
<code class=
"code">EXT_import_context
</code> is supported.
33 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
34 <code class=
"constant">GLXBadContext
</code> is generated if
<em class=
"parameter"><code>ctx
</code></em> does not
35 refer to a valid context.
37 <code class=
"constant">GLX_BAD_ATTRIBUTE
</code> is returned if
<em class=
"parameter"><code>attribute
</code></em> is not a valid GLX
40 fred
<code class=
"constant">GLX_BAD_CONTEXT
</code> is returned if
<em class=
"parameter"><code>attribute
</code></em> is not a valid context.
41 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
42 <a class=
"citerefentry" href=
"glXCreateContext.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glXCreateContext
</span></span></a>,
43 <a class=
"citerefentry" href=
"glXQueryVersion.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glXQueryVersion
</span></span></a>,
44 <a class=
"citerefentry" href=
"glXQueryExtensionsString.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glXQueryExtensionsString
</span></span></a>
45 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
46 Copyright
<span class=
"trademark"></span>©
1991-
2006
47 Silicon Graphics, Inc. This document is licensed under the SGI
48 Free Software B License. For details, see
49 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
50 </p></div></div></body></html>