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<title>cl_khr_gl_event</title>
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<a xmlns="http://www.w3.org/1999/xhtml" id="cl_khr_gl_event"></a>
<h1>cl_khr_gl_event</h1>
<p>
Create an OpenCL event object from a GL sync object.
</p>
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<div class="refsect2">
<a id="synopsis"></a>
<h3>
</h3>
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cl_khr_gl_event
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<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
This extension enables the function
<a class="citerefentry" href="clCreateEventFromGLsyncKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateEventFromGLsyncKHR</span></span></a>.
</p>
<p>
This extension allows creating OpenCL event objects linked to OpenGL fence sync objects,
potentially improving efficiency of sharing images and buffers between the two APIs. The
companion <code class="function">GL_ARB_cl_event</code> OpenGL extension provides the
complementary functionality of creating an OpenGL sync object from an OpenCL event object.
</p>
<p>
In addition, this extension modifies the behavior of
<a class="citerefentry" href="clEnqueueAcquireGLObjects.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueAcquireGLObjects</span></span></a>
and <a class="citerefentry" href="clEnqueueReleaseGLObjects.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseGLObjects</span></span></a>
to implicitly guarantee synchronization with an OpenGL context bound
in the same thread as the OpenCL context.
</p>
<p>
If this extension is supported by an implementation, the
string <code class="function">cl_khr_gl_event</code>
will be present in the <code class="constant">CL_PLATFORM_EXTENSIONS</code>
(see <a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a>)
or <code class="constant">CL_DEVICE_EXTENSIONS</code> string
(see <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>).
</p>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
Event objects can also be used to reflect the
status of an OpenGL sync object. The sync object
in turn refers to a fence command executing
in an OpenGL command stream. This provides
another method of coordinating sharing of
buffers and images between OpenGL and OpenCL
(see section 9.7.6.1).
</p>
<p>
If the <code class="function">cl_khr_gl_event</code> extension is supported,
then the OpenCL implementation will ensure that
any such pending OpenGL operations are complete
for an OpenGL context bound to the same
thread as the OpenCL context. This is referred
to as implicit synchronization.
</p>
<p>
If the <code class="function">cl_khr_gl_event</code> extension is
supported and the OpenGL context in question supports
fence sync objects, completion of OpenGL commands may also
be determined by placing a GL fence command after
those commands using <code class="function">glFenceSync</code>,
creating an event from the resulting GL sync object using
<a class="citerefentry" href="clCreateEventFromGLsyncKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateEventFromGLsyncKHR</span></span></a>,
and determining completion of that event object via
<a class="citerefentry" href="clEnqueueAcquireGLObjects.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueAcquireGLObjects</span></span></a>.
This method may be considerably more efficient than calling
<code class="function">glFinish</code>, and is referred to as
<code class="varname">explicit synchronization</code>. Explicit
synchronization is most useful when an OpenGL context
bound to another thread is accessing the memory objects.
</p>
<p>
If the <code class="function">cl_khr_gl_event</code> extension
is not supported, completion of OpenGL commands may be
determined by issuing and waiting for completion of a
<code class="function">glFinish</code> command on all OpenGL
contexts with pending references to these objects. Some
implementations may offer other efficient synchronization
methods. If such methods exist they will be described
in platform-specific documentation.
</p>
<p>
Note that no synchronization method other than
<code class="function">glFinish</code> is portable between all OpenGL
implementations and all OpenCL implementations.
While this is the only way to ensure completion that is portable
to all platforms, <code class="function">glFinish</code> is
an expensive operation and its use should be avoided if the
<code class="function">cl_khr_gl_event</code> extension is supported on a platform.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="https://www.khronos.org/registry/cl/specs/opencl-2.1-extensions.pdf#page=59" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</span></span></a>,
<a class="citerefentry" href="clCreateEventFromGLsyncKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateEventFromGLsyncKHR</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 © 2007-2015 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
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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