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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="glGetBufferSubData"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>2005</year> | |
9 | <holder>Sams Publishing</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glGetBufferSubData</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glGetBufferSubData</refname> | |
17 | <refpurpose>returns a subset of a buffer object's data store</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>glGetBufferSubData</function></funcdef> | |
23 | <paramdef>GLenum <parameter>target</parameter></paramdef> | |
24 | <paramdef>GLintptr <parameter>offset</parameter></paramdef> | |
25 | <paramdef>GLsizeiptr <parameter>size</parameter></paramdef> | |
26 | <paramdef>GLvoid * <parameter>data</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>target</parameter></term> | |
35 | <listitem> | |
36 | <para> | |
37 | Specifies the target buffer object. | |
38 | The symbolic constant must be <constant>GL_ARRAY_BUFFER</constant>, | |
39 | <constant>GL_ELEMENT_ARRAY_BUFFER</constant>, | |
40 | <constant>GL_PIXEL_PACK_BUFFER</constant>, or | |
41 | <constant>GL_PIXEL_UNPACK_BUFFER</constant>. | |
42 | </para> | |
43 | </listitem> | |
44 | </varlistentry> | |
45 | <varlistentry> | |
46 | <term><parameter>offset</parameter></term> | |
47 | <listitem> | |
48 | <para> | |
49 | Specifies the offset into the buffer object's data store from which data will be returned, | |
50 | measured in bytes. | |
51 | </para> | |
52 | </listitem> | |
53 | </varlistentry> | |
54 | <varlistentry> | |
55 | <term><parameter>size</parameter></term> | |
56 | <listitem> | |
57 | <para> | |
58 | Specifies the size in bytes of the data store region being returned. | |
59 | </para> | |
60 | </listitem> | |
61 | </varlistentry> | |
62 | <varlistentry> | |
63 | <term><parameter>data</parameter></term> | |
64 | <listitem> | |
65 | <para> | |
66 | Specifies a pointer to the location where buffer object data is returned. | |
67 | </para> | |
68 | </listitem> | |
69 | </varlistentry> | |
70 | </variablelist> | |
71 | </refsect1> | |
72 | <refsect1 id="description"><title>Description</title> | |
73 | <para> | |
74 | <function>glGetBufferSubData</function> returns some or all of the data from the buffer object currently | |
75 | bound to <parameter>target</parameter>. Data starting at byte offset <parameter>offset</parameter> and | |
76 | extending for <parameter>size</parameter> bytes is copied from the data store to the memory pointed to by | |
77 | <parameter>data</parameter>. An error is thrown if the buffer object is currently mapped, or if | |
78 | <parameter>offset</parameter> and <parameter>size</parameter> together define a range beyond the bounds | |
79 | of the buffer object's data store. | |
80 | </para> | |
81 | </refsect1> | |
82 | <refsect1 id="notes"><title>Notes</title> | |
83 | <para> | |
84 | If an error is generated, | |
85 | no change is made to the contents of <parameter>data</parameter>. | |
86 | </para> | |
87 | <para> | |
88 | <function>glGetBufferSubData</function> is available only if the GL version is 1.5 or greater. | |
89 | </para> | |
90 | <para> | |
91 | Targets <constant>GL_PIXEL_PACK_BUFFER</constant> and <constant>GL_PIXEL_UNPACK_BUFFER</constant> are available | |
92 | only if the GL version is 2.1 or greater. | |
93 | </para> | |
94 | </refsect1> | |
95 | <refsect1 id="errors"><title>Errors</title> | |
96 | <para> | |
97 | <constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not | |
98 | <constant>GL_ARRAY_BUFFER</constant>, <constant>GL_ELEMENT_ARRAY_BUFFER</constant>, | |
99 | <constant>GL_PIXEL_PACK_BUFFER</constant>, or <constant>GL_PIXEL_UNPACK_BUFFER</constant>. | |
100 | </para> | |
101 | <para> | |
102 | <constant>GL_INVALID_VALUE</constant> is generated if <parameter>offset</parameter> or | |
103 | <parameter>size</parameter> is negative, or if together they define a region of memory | |
104 | that extends beyond the buffer object's allocated data store. | |
105 | </para> | |
106 | <para> | |
107 | <constant>GL_INVALID_OPERATION</constant> is generated if the reserved buffer object name 0 is bound to <parameter>target</parameter>. | |
108 | </para> | |
109 | <para> | |
110 | <constant>GL_INVALID_OPERATION</constant> is generated if the buffer object being queried is mapped. | |
111 | </para> | |
112 | <para> | |
113 | <constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetBufferSubData</function> | |
114 | is executed between the execution of | |
115 | <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding execution of | |
116 | <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>. | |
117 | </para> | |
118 | </refsect1> | |
119 | <refsect1 id="seealso"><title>See Also</title> | |
120 | <para> | |
121 | <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>, | |
122 | <citerefentry><refentrytitle>glBufferData</refentrytitle></citerefentry>, | |
123 | <citerefentry><refentrytitle>glBufferSubData</refentrytitle></citerefentry>, | |
124 | <citerefentry><refentrytitle>glMapBuffer</refentrytitle></citerefentry>, | |
125 | <citerefentry><refentrytitle>glUnmapBuffer</refentrytitle></citerefentry> | |
126 | </para> | |
127 | </refsect1> | |
128 | <refsect1 id="Copyright"><title>Copyright</title> | |
129 | <para> | |
130 | Copyright <trademark class="copyright"></trademark> 2005 Addison-Wesley. | |
131 | This material may be distributed subject to the terms and conditions set forth in | |
132 | the Open Publication License, v 1.0, 8 June 1999. | |
133 | <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>. | |
134 | </para> | |
135 | </refsect1> | |
136 | </refentry> |