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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> | |
4 | <refentry id="glXCopyContext"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>1991-2006</year> | |
9 | <holder>Silicon Graphics, Inc.</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glXCopyContext</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glXCopyContext</refname> | |
17 | <refpurpose>copy state from one rendering context to another</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>glXCopyContext</function></funcdef> | |
23 | <paramdef>Display * <parameter>dpy</parameter></paramdef> | |
24 | <paramdef>GLXContext <parameter>src</parameter></paramdef> | |
25 | <paramdef>GLXContext <parameter>dst</parameter></paramdef> | |
26 | <paramdef>unsigned long <parameter>mask</parameter></paramdef> | |
27 | </funcprototype> | |
28 | </funcsynopsis> | |
29 | </refsynopsisdiv> | |
30 | <!-- eqn: ignoring delim $$ --> | |
31 | <refsect1 id="parameters"><title>Parameters</title> | |
32 | <variablelist> | |
33 | <varlistentry> | |
34 | <term><parameter>dpy</parameter></term> | |
35 | <listitem> | |
36 | <para> | |
37 | Specifies the connection to the X server. | |
38 | </para> | |
39 | </listitem> | |
40 | </varlistentry> | |
41 | <varlistentry> | |
42 | <term><parameter>src</parameter></term> | |
43 | <listitem> | |
44 | <para> | |
45 | Specifies the source context. | |
46 | </para> | |
47 | </listitem> | |
48 | </varlistentry> | |
49 | <varlistentry> | |
50 | <term><parameter>dst</parameter></term> | |
51 | <listitem> | |
52 | <para> | |
53 | Specifies the destination context. | |
54 | </para> | |
55 | </listitem> | |
56 | </varlistentry> | |
57 | <varlistentry> | |
58 | <term><parameter>mask</parameter></term> | |
59 | <listitem> | |
60 | <para> | |
61 | Specifies which portions of <parameter>src</parameter> state are to be copied to <parameter>dst</parameter>. | |
62 | </para> | |
63 | </listitem> | |
64 | </varlistentry> | |
65 | </variablelist> | |
66 | </refsect1> | |
67 | <refsect1 id="description"><title>Description</title> | |
68 | <para> | |
69 | <function>glXCopyContext</function> copies selected groups of state variables from <parameter>src</parameter> to <parameter>dst</parameter>. | |
70 | <parameter>mask</parameter> indicates which groups of state variables are to be copied. | |
71 | <parameter>mask</parameter> contains the bitwise OR of the same symbolic names that are | |
72 | passed to the GL command <citerefentry><refentrytitle>glPushAttrib</refentrytitle></citerefentry>. | |
73 | The single symbolic constant <constant>GLX_ALL_ATTRIB_BITS</constant> can be used to | |
74 | copy the maximum possible portion of rendering state. | |
75 | </para> | |
76 | <para> | |
77 | The copy can be done only if the renderers named by <parameter>src</parameter> and <parameter>dst</parameter> | |
78 | share an address space. | |
79 | Two rendering contexts share an address space if both are nondirect | |
80 | using the same server, | |
81 | or if both are direct and owned by a single process. | |
82 | Note that in the nondirect case it is not necessary for the calling | |
83 | threads to share an address space, | |
84 | only for their related rendering contexts to share an address space. | |
85 | </para> | |
86 | <para> | |
87 | Not all values for GL state can be copied. | |
88 | For example, | |
89 | pixel pack and unpack state, | |
90 | render mode state, | |
91 | and select and feedback state are not copied. | |
92 | The state that can be copied is exactly the state that is manipulated | |
93 | by the GL command | |
94 | <citerefentry><refentrytitle>glPushAttrib</refentrytitle></citerefentry>. | |
95 | </para> | |
96 | <para> | |
97 | An implicit <citerefentry><refentrytitle>glFlush</refentrytitle></citerefentry> is done by <function>glXCopyContext</function> if <parameter>src</parameter> is the current | |
98 | context for the calling thread. | |
99 | </para> | |
100 | </refsect1> | |
101 | <refsect1 id="notes"><title>Notes</title> | |
102 | <para> | |
103 | </para> | |
104 | <para> | |
105 | A <emphasis>process</emphasis> is a single execution environment, | |
106 | implemented in a single address space, | |
107 | consisting of one or more threads. | |
108 | </para> | |
109 | <para> | |
110 | A <emphasis>thread</emphasis> is one of a set of subprocesses that share | |
111 | a single address space, | |
112 | but maintain separate program counters, | |
113 | stack spaces, | |
114 | and other related global data. | |
115 | A <emphasis>thread</emphasis> that is the only member of its subprocess group | |
116 | is equivalent to a <emphasis>process</emphasis>. | |
117 | </para> | |
118 | </refsect1> | |
119 | <refsect1 id="errors"><title>Errors</title> | |
120 | <para> | |
121 | <constant>BadMatch</constant> is generated if rendering contexts <parameter>src</parameter> and <parameter>dst</parameter> | |
122 | do not share an address space | |
123 | or were not created with respect to the same screen. | |
124 | </para> | |
125 | <para> | |
126 | <constant>BadAccess</constant> is generated if <parameter>dst</parameter> is current to any thread | |
127 | (including the calling thread) at the time <function>glXCopyContext</function> is called. | |
128 | </para> | |
129 | <para> | |
130 | <constant>GLXBadCurrentWindow</constant> is generated if <parameter>src</parameter> is the current | |
131 | context and the current drawable is a window that is no longer valid. | |
132 | </para> | |
133 | <para> | |
134 | <constant>GLXBadContext</constant> is generated if either <parameter>src</parameter> or <parameter>dst</parameter> is not | |
135 | a valid GLX context. | |
136 | </para> | |
137 | </refsect1> | |
138 | <refsect1 id="seealso"><title>See Also</title> | |
139 | <para> | |
140 | <citerefentry><refentrytitle>glPushAttrib</refentrytitle></citerefentry>, | |
141 | <citerefentry><refentrytitle>glXCreateContext</refentrytitle></citerefentry>, | |
142 | <citerefentry><refentrytitle>glXIsDirect</refentrytitle></citerefentry> | |
143 | </para> | |
144 | </refsect1> | |
145 | <refsect1 id="Copyright"><title>Copyright</title> | |
146 | <para> | |
147 | Copyright <trademark class="copyright"></trademark> 1991-2006 | |
148 | Silicon Graphics, Inc. This document is licensed under the SGI | |
149 | Free Software B License. For details, see | |
150 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. | |
151 | </para> | |
152 | </refsect1> | |
153 | </refentry> |