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    <title>clEnqueueAcquireEGLObjectsKHR</title>
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    <div class="refentry">
      <a id="id-1"></a>
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      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clEnqueueAcquireEGLObjectsKHR"></a>
        <h1>clEnqueueAcquireEGLObjectsKHR</h1>
        <p>
            Acquire OpenCL memory objects that have been created from EGL resources.
        </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="scalarDataTypes.html" target="pagedisplay">cl_int</a>

                    <strong class="fsfunc">
                        clEnqueueAcquireEGLObjectsKHR
                    </strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_objects</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*mem_objects</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_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event_wait_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</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">command_queue</code>
                </span>
            </dt>
            <dd>
              <p>A valid command-queue.</p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">num_objects</code>
                </span>
            </dt>
            <dd>
              <p>
                        The number of memory objects to be acquired in <code class="varname">mem_objects</code>.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">mem_objects</code>
                </span>
            </dt>
            <dd>
              <p>
                        A pointer to a list of OpenCL memory objects 
                        that were created from EGL 
                        resources, within the context associate with 
                        <code class="varname">command_queue</code>.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">event_wait_list</code>
                , </span>
              <span class="term">
                    <code class="varname">num_events_in_wait_list</code>
                </span>
            </dt>
            <dd>
              <p>
                        Specify events that need to complete before this
                        particular command can be executed. If 
                        <code class="varname">event_wait_list</code> is NULL, 
                        then this particular command
                        does not wait on any event to complete. 
                        If <code class="varname">event_wait_list</code> is NULL,
                        <code class="varname">num_events_in_wait_list</code>
                        must be 0. If <code class="varname">event_wait_list</code> 
                        is not NULL, the list of events pointed to by 
                        <code class="varname">event_wait_list</code> must
                        be valid and <code class="varname">num_events_in_wait_list</code> 
                        must be greater than 0. The events specified in
                        <code class="varname">event_wait_list</code> act 
                        as synchronization points.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">event</code>
                </span>
            </dt>
            <dd>
              <p>
                      Returns an event object that identifies
                      this command and can be used to query or queue a wait for the command
                      to complete. <code class="varname">event</code> can be NULL in which case
                      it will not be possible for the application to query the status of
                      this command or queue a wait for this command to complete.
                    </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
            This function is used to acquire OpenCL memory objects 
            that have been created from EGL resources. The 
            EGL objects are acquired by the OpenCL context 
            associated with <code class="varname">command_queue</code> and can 
            therefore be used by all command-queues 
            associated with the OpenCL context.
        </p>
        <p>
            OpenCL memory objects created from EGL resources 
            must be acquired before they can be used 
            by any OpenCL commands queued to a command-queue. 
            If an OpenCL memory object created 
            from a EGL resource is used while it is not 
            currently acquired by OpenCL, the call attempting to 
            use that OpenCL memory object will return 
            <span class="errorname">CL_EGL_RESOURCE_NOT_ACQUIRED_KHR</span>.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns <span class="errorname">CL_SUCCESS</span> if the function is executed successfully. If
          <code class="varname">num_objects</code> is 0 and <code class="varname">mem_objects</code> is NULL the
          function does nothing and returns <span class="errorname">CL_SUCCESS</span>. Otherwise,
          it returns one of the following errors:
        </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_VALUE</span> if <code class="varname">num_objects</code>
              is zero and <code class="varname">mem_objects</code> is not a NULL value or if
              <code class="varname">num_objects</code> &gt; 0 and <code class="varname">mem_objects</code> is NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if memory objects in
              <code class="varname">mem_objects</code> are not valid OpenCL memory objects
              in the context associated with <code class="varname">command_queue</code>.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EGL_OBJECT_KHR</span> if memory objects in
              <code class="varname">mem_objects</code> have not been 
              created from EGL resources.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if <code class="varname">command_queue</code>
              is not a valid command-queue.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT_WAIT_LIST</span>
              if <code class="varname">event_wait_list</code> is NULL and
              <code class="varname">num_events_in_wait_list</code> &gt; 0,
              or <code class="varname">event_wait_list</code> is not NULL and
              <code class="varname">num_events_in_wait_list</code> is 0, or if event objects in
              <code class="varname">event_wait_list</code> are not valid events.
            </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="https://www.khronos.org/registry/cl/specs/opencl-2.0-extensions.pdf#page=154" 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_egl_image.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_image</span></span></a>,
            <a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a>,
            <a class="citerefentry" href="clEnqueueReleaseEGLObjectsKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseEGLObjectsKHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromEGLImageKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromEGLImageKHR</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 © 2007-2013 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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