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| <title>cl_khr_gl_event</title> |
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| <div xmlns="" class="refnamediv"> |
| <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> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
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| cl_khr_gl_event |
| </td> |
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| </table> |
| </div> |
| </div> |
| <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. |
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