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<title>clCreateFromGLBuffer</title>
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<div class="refentry">
<a id="idm1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clCreateFromGLBuffer"></a>
<h1>clCreateFromGLBuffer</h1>
<p>
Creates an OpenCL buffer object from an OpenGL buffer object.
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"><a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a>
<strong class="fsfunc">
clCreateFromGLBuffer
</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_context</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_flags" target="pagedisplay">cl_mem_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>GLuint <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">bufobj</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">* errcode_ret</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="parameters"></a>
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term"> <code class="varname"> context </code> </span>
</dt>
<dd>
<p>
A valid OpenCL context created from an OpenGL context.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> flags </code> </span>
</dt>
<dd>
<p>
A bit-field that is
used to specify usage information. Refer to the table for
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a> for a description of <code class="varname">flags</code>. Only
<code class="constant">CL_MEM_READ_ONLY</code>, <code class="constant">CL_MEM_WRITE_ONLY</code>
and <code class="constant">CL_MEM_READ_WRITE</code> values specified in the table at
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>
can be used.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> bufobj </code> </span>
</dt>
<dd>
<p>
The name of a GL buffer object. The data
store of the GL buffer object must have have been previously created by
calling OpenGL function <code class="function">glBufferData</code>, although its
contents need not be initialized. The size of the data store will be used
to determine the size of the CL buffer object.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> errcode_ret </code> </span>
</dt>
<dd>
<p>
Returns an appropriate error code as described
below. If <code class="varname">errcode_ret</code> is NULL, no error code is returned.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
The size of the GL buffer object data store at the time
<code class="function">clCreateFromGLBuffer</code> is called will be used as the size of buffer
object returned by <code class="function">clCreateFromGLBuffer</code>. If the state of a GL
buffer object is modified through the GL API (e.g. <code class="function">glBufferData</code>)
while there exists a corresponding CL buffer object, subsequent use of the CL buffer
object will result in undefined behavior.
</p>
<p>
The <a class="citerefentry" href="clRetainMemObject.html"><span class="citerefentry"><span class="refentrytitle">clRetainMemObject</span></span></a>
and <a class="citerefentry" href="clReleaseMemObject.html"><span class="citerefentry"><span class="refentrytitle">clReleaseMemObject</span></span></a>
functions can be used to retain and release the buffer object.
</p>
<p>
The CL buffer object created using <code class="function">clCreateFromGLBuffer</code> can also
be used to create a CL 1D image buffer object
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
Returns a valid non-zero OpenCL buffer object and <code class="varname">errcode_ret</code> is set
to CL_SUCCESS if the buffer object is created successfully. Otherwise, it returns a NULL
value with one of the following error values returned in <code class="varname">errcode_ret</code>:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if <code class="varname">context</code> is not
a valid context or was not created from a GL context.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if values specified in
<code class="varname">flags</code> are not valid.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GL_OBJECT</span> if <code class="varname">bufobj</code> is not
a GL buffer object or is a GL buffer object but does not have an existing data
store e or the size of the buffer is 0. .
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate
resources required by the OpenCL implementation on the device.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
</li>
</ul>
</div>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf#page=49" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="cl_khr_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a>,
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>,
<a class="citerefentry" href="clReleaseMemObject.html"><span class="citerefentry"><span class="refentrytitle">clReleaseMemObject</span></span></a>,
<a class="citerefentry" href="clRetainMemObject.html"><span class="citerefentry"><span class="refentrytitle">clRetainMemObject</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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