<div class="refentry" id="glCopyBufferSubData">

<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 style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glCopyBufferSubData</strong>(</code>

</td>

<td>GLenum <var class="pdparam">readtarget</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLenum <var class="pdparam">writetarget</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLintptr <var class="pdparam">readoffset</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLintptr <var class="pdparam">writeoffset</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLsizeiptr <var class="pdparam">size</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

</div>

<div class="refsect1" id="parameters">

<h2>Parameters</h2>

<div class="variablelist">

<dl class="variablelist">

<dt>

<span class="term">

<em class="parameter">

<code>readtarget</code>

</em>

</span>

</dt>

<dd>

<p>

Specifies the target from whose data store data should be read.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>writetarget</code>

</em>

</span>

</dt>

<dd>

<p>

Specifies the target to whose data store data should be written.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>readoffset</code>

</em>

</span>

</dt>

<dd>

<p>

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.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>writeoffset</code>

</em>

</span>

</dt>

<dd>

<p>

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.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>size</code>

</em>

</span>

</dt>

<dd>

<p>

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>.

</p>

</dd>

</dl>

</div>

</div>

<div class="refsect1" id="description">

<h2>Description</h2>

<p>

<code class="function">glCopyBufferSubData</code> copies part of the data store attached to <em class="parameter"><code>readtarget</code></em> to the

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>

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>,

also in basic machine units.

</p>

<p>

<em class="parameter"><code>readtarget</code></em> and <em class="parameter"><code>writetarget</code></em> must be <code class="constant">GL_ARRAY_BUFFER</code>,

<code class="constant">GL_COPY_READ_BUFFER</code>, <code class="constant">GL_COPY_WRITE_BUFFER</code>, <code class="constant">GL_ELEMENT_ARRAY_BUFFER</code>,

<code class="constant">GL_PIXEL_PACK_BUFFER</code>, <code class="constant">GL_PIXEL_UNPACK_BUFFER</code>,

<code class="constant">GL_TRANSFORM_FEEDBACK_BUFFER</code> or <code class="constant">GL_UNIFORM_BUFFER</code>. Any of these targets may be used,

although the targets <code class="constant">GL_COPY_READ_BUFFER</code> and <code class="constant">GL_COPY_WRITE_BUFFER</code> are provided

specifically to allow copies between buffers without disturbing other GL state.

</p>

<p>

<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

zero. Furthermore, <em class="parameter"><code>readoffset</code></em> + <em class="parameter"><code>size</code></em> must not exceeed the size of the buffer

object bound to <em class="parameter"><code>readtarget</code></em>, and <em class="parameter"><code>writeoffset</code></em> + <em class="parameter"><code>size</code></em> must not exceeed the

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>

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>

and <em class="parameter"><code>size</code></em> must not overlap.

</p>

</div>

<div class="refsect1" id="errors">

<h2>Errors</h2>

<p>

<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>

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

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>

exceeds the size of the buffer object bound to <em class="parameter"><code>writetarget</code></em>.

</p>

<p>

<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>

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> +

<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>)

overlap.

</p>

<p>

<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>.

</p>

<p>

<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>

is mapped.

</p>

</div>

{$pipelinestall}{$examples}

<div class="refsect1" id="versions">

<h2>API Version Support</h2>

<div class="informaltable">

<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">

<colgroup>

<col style="text-align: left; "/>

<col style="text-align: center; " class="firstvers"/>

<col style="text-align: center; "/>

<col style="text-align: center; " class="lastvers"/>

</colgroup>

<thead>

<tr>

<th style="text-align: left; border-right: 2px solid ; ">

</th>

<th style="text-align: center; border-bottom: 2px solid ; " colspan="3">

<span class="bold"><strong>OpenGL ES API Version</strong></span>

</th>

</tr>

<tr>

<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>Function Name</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>2.0</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.0</strong></span>

</th>

<th style="text-align: center; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.1</strong></span>

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; ">glCopyBufferSubData</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; ">✔</td>

</tr>

</tbody>

</table>

</div>

</div>

<div class="refsect1" id="seealso">

<h2>See Also</h2>

<p>

<a class="citerefentry" href="glGenBuffers"><span class="citerefentry"><span class="refentrytitle">glGenBuffers</span></span></a>,

<a class="citerefentry" href="glBindBuffer"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>,

<a class="citerefentry" href="glBufferData"><span class="citerefentry"><span class="refentrytitle">glBufferData</span></span></a>,

<a class="citerefentry" href="glBufferSubData"><span class="citerefentry"><span class="refentrytitle">glBufferSubData</span></span></a>,

</p>

</div>

<div class="refsect1" id="Copyright">

<h2>Copyright</h2>

<p>

Copyright © 2010-2014 Khronos Group.

This material may be distributed subject to the terms and conditions set forth in

the Open Publication License, v 1.0, 8 June 1999.

<a class="link" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.

</p>

</div>

</div>