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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="glXCreatePbuffer"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>1991-2006</year> | |
9 | <holder>Silicon Graphics, Inc.</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glXCreatePbuffer</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glXCreatePbuffer</refname> | |
17 | <refpurpose>create an off-screen rendering area</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>GLXPbuffer <function>glXCreatePbuffer</function></funcdef> | |
23 | <paramdef>Display * <parameter>dpy</parameter></paramdef> | |
24 | <paramdef>GLXFBConfig <parameter>config</parameter></paramdef> | |
25 | <paramdef>const int * <parameter>attrib_list</parameter></paramdef> | |
26 | </funcprototype> | |
27 | </funcsynopsis> | |
28 | </refsynopsisdiv> | |
29 | <!-- eqn: ignoring delim $$ --> | |
30 | <refsect1 id="parameters"><title>Parameters</title> | |
31 | <variablelist> | |
32 | <varlistentry> | |
33 | <term><parameter>dpy</parameter></term> | |
34 | <listitem> | |
35 | <para> | |
36 | Specifies the connection to the X server. | |
37 | </para> | |
38 | </listitem> | |
39 | </varlistentry> | |
40 | <varlistentry> | |
41 | <term><parameter>config</parameter></term> | |
42 | <listitem> | |
43 | <para> | |
44 | Specifies a GLXFBConfig structure with the desired attributes for the | |
45 | window. | |
46 | </para> | |
47 | </listitem> | |
48 | </varlistentry> | |
49 | <varlistentry> | |
50 | <term><parameter>attrib_list</parameter></term> | |
51 | <listitem> | |
52 | <para> | |
53 | Specifies a list of attribute value pairs, which must be terminated with | |
54 | <constant>None</constant> or <constant>NULL</constant>. Accepted attributes are | |
55 | <constant>GLX_PBUFFER_WIDTH</constant>, <constant>GLX_PBUFFER_HEIGHT</constant>, | |
56 | <constant>GLX_PRESERVED_CONTENTS</constant>, and <constant>GLX_LARGEST_PBUFFER</constant>. | |
57 | </para> | |
58 | </listitem> | |
59 | </varlistentry> | |
60 | </variablelist> | |
61 | </refsect1> | |
62 | <refsect1 id="description"><title>Description</title> | |
63 | <para> | |
64 | <function>glXCreatePbuffer</function> creates an off-screen rendering area and returns its XID. | |
65 | Any GLX rendering context that was created with respect to <parameter>config</parameter> | |
66 | can be used to render into this window. | |
67 | Use <citerefentry><refentrytitle>glXMakeContextCurrent</refentrytitle></citerefentry> to associate the rendering area with a GLX | |
68 | rendering context. | |
69 | </para> | |
70 | <para> | |
71 | The accepted attributes for a GLXPbuffer are: | |
72 | </para> | |
73 | <variablelist> | |
74 | <varlistentry> | |
75 | <term><constant>GLX_PBUFFER_WIDTH</constant></term> | |
76 | <listitem> | |
77 | <para> | |
78 | Specify the pixel width of the requested GLXPbuffer. The default value | |
79 | is 0. | |
80 | </para> | |
81 | </listitem> | |
82 | </varlistentry> | |
83 | <varlistentry> | |
84 | <term><constant>GLX_PBUFFER_HEIGHT</constant></term> | |
85 | <listitem> | |
86 | <para> | |
87 | Specify the pixel height of the requested GLXPbuffer. The default value | |
88 | is 0. | |
89 | </para> | |
90 | </listitem> | |
91 | </varlistentry> | |
92 | <varlistentry> | |
93 | <term><constant>GLX_LARGEST_PBUFFER</constant></term> | |
94 | <listitem> | |
95 | <para> | |
96 | Specify to obtain the largest available pixel buffer, if the requested | |
97 | allocation would have failed. The width and height of the allocated | |
98 | pixel buffer will never exceed the specified <constant>GLX_PBUFFER_WIDTH</constant> or | |
99 | <constant>GLX_PBUFFER_HEIGHT</constant>, respectively. Use <citerefentry><refentrytitle>glXQueryDrawable</refentrytitle></citerefentry> to | |
100 | retrieve the dimensions of the allocated pixel buffer. The default value is | |
101 | <constant>False</constant>. | |
102 | </para> | |
103 | </listitem> | |
104 | </varlistentry> | |
105 | <varlistentry> | |
106 | <term><constant>GLX_PRESERVED_CONTENTS</constant></term> | |
107 | <listitem> | |
108 | <para> | |
109 | Specify if the contents of the pixel buffer should be preserved when a | |
110 | resource conflict occurs. If set to <constant>False</constant>, the contents of the | |
111 | pixel buffer may be lost at any time. If set to <constant>True</constant>, or not | |
112 | specified in <parameter>attrib_list</parameter>, then the contents of the pixel buffer will be preserved | |
113 | (most likely by copying the contents into main system memory from the | |
114 | frame buffer). In either case, the client can register (using | |
115 | <citerefentry><refentrytitle>glXSelectEvent</refentrytitle></citerefentry>, to receive | |
116 | pixel buffer clobber events that are generated when the pbuffer contents have | |
117 | been preserved or damaged. | |
118 | </para> | |
119 | </listitem> | |
120 | </varlistentry> | |
121 | </variablelist> | |
122 | <para> | |
123 | GLXPbuffers contain the color and ancillary buffers specified by | |
124 | <parameter>config</parameter>. It is possible to create a pixel buffer with back buffers and | |
125 | to swap those buffers using <citerefentry><refentrytitle>glXSwapBuffers</refentrytitle></citerefentry>. | |
126 | </para> | |
127 | </refsect1> | |
128 | <refsect1 id="notes"><title>Notes</title> | |
129 | <para> | |
130 | <function>glXCreatePbuffer</function> is available only if the GLX version is 1.3 or greater. | |
131 | </para> | |
132 | <para> | |
133 | If the GLX version is 1.1 or 1.0, the GL version must be 1.0. | |
134 | If the GLX version is 1.2, then the GL version must be 1.1. | |
135 | If the GLX version is 1.3, then the GL version must be 1.2. | |
136 | </para> | |
137 | <para> | |
138 | GLXPbuffers are allocated from frame buffer resources; applications | |
139 | should consider deallocating them when they are not in use. | |
140 | </para> | |
141 | </refsect1> | |
142 | <refsect1 id="errors"><title>Errors</title> | |
143 | <para> | |
144 | <constant>BadAlloc</constant> is generated if there are insufficient resources to | |
145 | allocate the requested GLXPbuffer. | |
146 | </para> | |
147 | <para> | |
148 | <constant>GLXBadFBConfig</constant> is generated if <parameter>config</parameter> is not a valid | |
149 | GLXFBConfig. | |
150 | </para> | |
151 | <para> | |
152 | <constant>BadMatch</constant> is generated if <parameter>config</parameter> does not support rendering to | |
153 | pixel buffers (e.g., <constant>GLX_DRAWABLE_TYPE</constant> does not contain | |
154 | <constant>GLX_PBUFFER_BIT</constant>). | |
155 | </para> | |
156 | </refsect1> | |
157 | <refsect1 id="seealso"><title>See Also</title> | |
158 | <para> | |
159 | <citerefentry><refentrytitle>glXChooseFBConfig</refentrytitle></citerefentry>, | |
160 | <function>glXCreatePbuffer</function>, | |
161 | <citerefentry><refentrytitle>glXMakeContextCurrent</refentrytitle></citerefentry>, | |
162 | <citerefentry><refentrytitle>glXSelectEvent</refentrytitle></citerefentry> | |
163 | </para> | |
164 | </refsect1> | |
165 | <refsect1 id="Copyright"><title>Copyright</title> | |
166 | <para> | |
167 | Copyright <trademark class="copyright"></trademark> 1991-2006 | |
168 | Silicon Graphics, Inc. This document is licensed under the SGI | |
169 | Free Software B License. For details, see | |
170 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. | |
171 | </para> | |
172 | </refsect1> | |
173 | </refentry> |