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4 Reference Pages
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.69.1" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glCopyBufferSubData"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glCopyBufferSubData — copy part of the data store of a buffer object to the data store of another buffer object
</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">glCopyBufferSubData
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">readtarget
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">writetarget
</var>,
</td></tr><tr><td> </td><td>GLintptr
</td><td><var class=
"pdparam">readoffset
</var>,
</td></tr><tr><td> </td><td>GLintptr
</td><td><var class=
"pdparam">writeoffset
</var>,
</td></tr><tr><td> </td><td>GLsizeiptr
</td><td><var class=
"pdparam">size
</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>readtarget
</code></em></span></dt><dd><p>
5 Specifies the target from whose data store data should be read.
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>writetarget
</code></em></span></dt><dd><p>
7 Specifies the target to whose data store data should be written.
8 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>readoffset
</code></em></span></dt><dd><p>
9 Specifies the offset, in basic machine units, within the data store of
<em class=
"parameter"><code>readtarget
</code></em> from which data should be read.
10 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>writeoffset
</code></em></span></dt><dd><p>
11 Specifies the offset, in basic machine units, within the data store of
<em class=
"parameter"><code>writetarget
</code></em> to which data should be written.
12 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>size
</code></em></span></dt><dd><p>
13 Specifies the size, in basic machine units, of the data to be copied from
<em class=
"parameter"><code>readtarget
</code></em> to
<em class=
"parameter"><code>writetarget
</code></em>.
14 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
15 <code class=
"function">glCopyBufferSubData
</code> copies part of the data store attached to
<em class=
"parameter"><code>readtarget
</code></em> to the
16 data store attached to
<em class=
"parameter"><code>writetarget
</code></em>. The number of basic machine units indicated by
<em class=
"parameter"><code>size
</code></em>
17 is copied from the source, at offset
<em class=
"parameter"><code>readoffset
</code></em> to the destination at
<em class=
"parameter"><code>writeoffset
</code></em>,
18 also in basic machine units.
20 <em class=
"parameter"><code>readtarget
</code></em> and
<em class=
"parameter"><code>writetarget
</code></em> must be
<code class=
"constant">GL_ARRAY_BUFFER
</code>,
21 <code class=
"constant">GL_COPY_READ_BUFFER
</code>,
<code class=
"constant">GL_COPY_WRITE_BUFFER
</code>,
<code class=
"constant">GL_ELEMENT_ARRAY_BUFFER
</code>,
22 <code class=
"constant">GL_PIXEL_PACK_BUFFER
</code>,
<code class=
"constant">GL_PIXEL_UNPACK_BUFFER
</code>,
<code class=
"constant">GL_TEXTURE_BUFFER
</code>,
23 <code class=
"constant">GL_TRANSFORM_FEEDBACK_BUFFER
</code> or
<code class=
"constant">GL_UNIFORM_BUFFER
</code>. Any of these targets may be used,
24 although the targets
<code class=
"constant">GL_COPY_READ_BUFFER
</code> and
<code class=
"constant">GL_COPY_WRITE_BUFFER
</code> are provided
25 specifically to allow copies between buffers without disturbing other GL state.
27 <em class=
"parameter"><code>readoffset
</code></em>,
<em class=
"parameter"><code>writeoffset
</code></em> and
<em class=
"parameter"><code>size
</code></em> must all be greater than or equal to
28 zero. Furthermore,
<em class=
"parameter"><code>readoffset
</code></em> +
<em class=
"parameter"><code>size
</code></em> must not exceeed the size of the buffer
29 object bound to
<em class=
"parameter"><code>readtarget
</code></em>, and
<em class=
"parameter"><code>readoffset
</code></em> +
<em class=
"parameter"><code>size
</code></em> must not exceeed the
30 size of the buffer bound to
<em class=
"parameter"><code>writetarget
</code></em>. If the same buffer object is bound to both
<em class=
"parameter"><code>readtarget
</code></em>
31 and
<em class=
"parameter"><code>writetarget
</code></em>, then the ranges specified by
<em class=
"parameter"><code>readoffset
</code></em>,
<em class=
"parameter"><code>writeoffset
</code></em>
32 and
<em class=
"parameter"><code>size
</code></em> must not overlap.
33 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
34 <code class=
"function">glCopyBufferSubData
</code> is available only if the GL version is
3.1 or greater.
35 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
36 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if any of
<em class=
"parameter"><code>readoffset
</code></em>,
<em class=
"parameter"><code>writeoffset
</code></em>
37 or
<em class=
"parameter"><code>size
</code></em> is negative, if
<em class=
"parameter"><code>readoffset
</code></em> +
<em class=
"parameter"><code>size
</code></em> exceeds the
38 size of the buffer object bound to
<em class=
"parameter"><code>readtarget
</code></em> or if
<em class=
"parameter"><code>writeoffset
</code></em> +
<em class=
"parameter"><code>size
</code></em>
39 exceeds the size of the buffer object bound to
<em class=
"parameter"><code>writetarget
</code></em>.
41 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if the same buffer object is bound to both
<em class=
"parameter"><code>readtarget
</code></em>
42 and
<em class=
"parameter"><code>writetarget
</code></em> and the ranges [
<em class=
"parameter"><code>readoffset
</code></em>,
<em class=
"parameter"><code>readoffset
</code></em> +
43 <em class=
"parameter"><code>size
</code></em>) and [
<em class=
"parameter"><code>writeoffset
</code></em>,
<em class=
"parameter"><code>writeoffset
</code></em> +
<em class=
"parameter"><code>size
</code></em>)
46 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if zero is bound to
<em class=
"parameter"><code>readtarget
</code></em> or
<em class=
"parameter"><code>writetarget
</code></em>.
48 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if the buffer object bound to either
<em class=
"parameter"><code>readtarget
</code></em> or
<em class=
"parameter"><code>writetarget
</code></em>
50 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
51 <a href=
"glGenBuffers.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGenBuffers
</span></span></a>,
52 <a href=
"glBindBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindBuffer
</span></span></a>,
53 <a href=
"glBufferData.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBufferData
</span></span></a>,
54 <a href=
"glBufferSubData.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBufferSubData
</span></span></a>,
55 <a href=
"glGetBufferSubData.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetBufferSubData
</span></span></a>
56 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
57 Copyright
<span class=
"trademark"></span>©
2010 Khronos Group.
58 This material may be distributed subject to the terms and conditions set forth in
59 the Open Publication License, v
1.0,
8 June
1999.
60 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
61 </p></div></div></body></html>
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