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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
2 | <!-- saved from url=(0013)about:internet --> | |
3 | <?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>glXCopyContext</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glXCopyContext"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glXCopyContext — copy state from one rendering context to another</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">void <b class="fsfunc">glXCopyContext</b>(</code></td><td>Display * </td><td><var class="pdparam">dpy</var>, </td></tr><tr><td> </td><td>GLXContext </td><td><var class="pdparam">src</var>, </td></tr><tr><td> </td><td>GLXContext </td><td><var class="pdparam">dst</var>, </td></tr><tr><td> </td><td>unsigned long </td><td><var class="pdparam">mask</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>src</code></em></span></dt><dd><p> | |
6 | Specifies the source context. | |
7 | </p></dd><dt><span class="term"><em class="parameter"><code>dst</code></em></span></dt><dd><p> | |
8 | Specifies the destination context. | |
9 | </p></dd><dt><span class="term"><em class="parameter"><code>mask</code></em></span></dt><dd><p> | |
10 | Specifies which portions of <em class="parameter"><code>src</code></em> state are to be copied to <em class="parameter"><code>dst</code></em>. | |
11 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
12 | <code class="function">glXCopyContext</code> copies selected groups of state variables from <em class="parameter"><code>src</code></em> to <em class="parameter"><code>dst</code></em>. | |
13 | <em class="parameter"><code>mask</code></em> indicates which groups of state variables are to be copied. | |
14 | <em class="parameter"><code>mask</code></em> contains the bitwise OR of the same symbolic names that are | |
15 | passed to the GL command <a class="citerefentry" href="glPushAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPushAttrib</span></span></a>. | |
16 | The single symbolic constant <code class="constant">GLX_ALL_ATTRIB_BITS</code> can be used to | |
17 | copy the maximum possible portion of rendering state. | |
18 | </p><p> | |
19 | The copy can be done only if the renderers named by <em class="parameter"><code>src</code></em> and <em class="parameter"><code>dst</code></em> | |
20 | share an address space. | |
21 | Two rendering contexts share an address space if both are nondirect | |
22 | using the same server, | |
23 | or if both are direct and owned by a single process. | |
24 | Note that in the nondirect case it is not necessary for the calling | |
25 | threads to share an address space, | |
26 | only for their related rendering contexts to share an address space. | |
27 | </p><p> | |
28 | Not all values for GL state can be copied. | |
29 | For example, | |
30 | pixel pack and unpack state, | |
31 | render mode state, | |
32 | and select and feedback state are not copied. | |
33 | The state that can be copied is exactly the state that is manipulated | |
34 | by the GL command | |
35 | <a class="citerefentry" href="glPushAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPushAttrib</span></span></a>. | |
36 | </p><p> | |
37 | An implicit <a class="citerefentry" href="glFlush.xml"><span class="citerefentry"><span class="refentrytitle">glFlush</span></span></a> is done by <code class="function">glXCopyContext</code> if <em class="parameter"><code>src</code></em> is the current | |
38 | context for the calling thread. | |
39 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
40 | </p><p> | |
41 | A <span class="emphasis"><em>process</em></span> is a single execution environment, | |
42 | implemented in a single address space, | |
43 | consisting of one or more threads. | |
44 | </p><p> | |
45 | A <span class="emphasis"><em>thread</em></span> is one of a set of subprocesses that share | |
46 | a single address space, | |
47 | but maintain separate program counters, | |
48 | stack spaces, | |
49 | and other related global data. | |
50 | A <span class="emphasis"><em>thread</em></span> that is the only member of its subprocess group | |
51 | is equivalent to a <span class="emphasis"><em>process</em></span>. | |
52 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
53 | <code class="constant">BadMatch</code> is generated if rendering contexts <em class="parameter"><code>src</code></em> and <em class="parameter"><code>dst</code></em> | |
54 | do not share an address space | |
55 | or were not created with respect to the same screen. | |
56 | </p><p> | |
57 | <code class="constant">BadAccess</code> is generated if <em class="parameter"><code>dst</code></em> is current to any thread | |
58 | (including the calling thread) at the time <code class="function">glXCopyContext</code> is called. | |
59 | </p><p> | |
60 | <code class="constant">GLXBadCurrentWindow</code> is generated if <em class="parameter"><code>src</code></em> is the current | |
61 | context and the current drawable is a window that is no longer valid. | |
62 | </p><p> | |
63 | <code class="constant">GLXBadContext</code> is generated if either <em class="parameter"><code>src</code></em> or <em class="parameter"><code>dst</code></em> is not | |
64 | a valid GLX context. | |
65 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
66 | <a class="citerefentry" href="glPushAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPushAttrib</span></span></a>, | |
67 | <a class="citerefentry" href="glXCreateContext.xml"><span class="citerefentry"><span class="refentrytitle">glXCreateContext</span></span></a>, | |
68 | <a class="citerefentry" href="glXIsDirect.xml"><span class="citerefentry"><span class="refentrytitle">glXIsDirect</span></span></a> | |
69 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
70 | Copyright <span class="trademark"></span>© 1991-2006 | |
71 | Silicon Graphics, Inc. This document is licensed under the SGI | |
72 | Free Software B License. For details, see | |
73 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
74 | </p></div></div></body></html> |