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    <title>clCreateFromEGLImageKHR</title>
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    <div class="refentry">
      <a id="id-1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clCreateFromEGLImageKHR"></a>
        <h1>clCreateFromEGLImageKHR</h1>
        <p>
            Creates an EGLImage target from an EGLImage source.
        </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">
                        clCreateFromEGLImageKHR
                    </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>CLeglDisplayKHR <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">display</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>CLeglImageKHR <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>, </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>const cl_egl_image_properties_khr <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">* properties</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> 
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname">display</code> </span>
            </dt>
            <dd>
              <p>
                        Should be of type <span class="type">EGLDisplay</span>, cast into the type <span class="type">CLeglDisplayKHR</span>.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname">image</code> </span>
            </dt>
            <dd>
              <p>
                        Should be of type <span class="type">EGLImageKHR</span>, cast into
                        the type <span class="type">CLeglImageKHR</span>. Assuming no
                        errors are generated in this function, the resulting
                        image object will be an EGLImage target of
                        the specified EGLImage <code class="varname">image</code>. The resulting
                        <span class="type">cl_mem</span> is an image object which may be used
                        normally by all OpenCL operations. This maps to an
                        <span class="type">image2d_t</span> type in OpenCL kernel code.
                    </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 about the memory object being created.
                        The possible values for <code class="varname">flags</code> are:
                        <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>.
                    </p>
              <p>
                        For OpenCL 1.2 <code class="varname">flags</code> also accepts:
                        <code class="constant">CL_MEM_HOST_WRITE_ONLY</code>,
                        <code class="constant">CL_MEM_HOST_READ_ONLY</code> or
                        <code class="constant">CL_MEM_HOST_NO_ACCESS</code>.
                    </p>
              <p>
                        This extension only requires support for
                        <code class="constant">CL_MEM_READ_ONLY</code>,
                        and for OpenCL 1.2
                        <code class="constant">CL_MEM_HOST_NO_ACCESS</code>.
                        For OpenCL 1.1, a
                        <span class="errorname">CL_INVALID_OPERATION</span>
                        will be returned
                        for images which do not support host mapping.
                    </p>
              <p>
                        If the value passed in <code class="varname">flags</code> is not
                        supported by the OpenCL implementation it will return
                        <span class="errorname">CL_INVALID_VALUE</span>. The
                        accepted <code class="varname">flags</code> may be dependent upon
                        the texture format used.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname">properties</code> </span>
            </dt>
            <dd>
              <p>
                        Specifies a list of property names and their
                        corresponding values. Each property name
                        is immediately followed by the corresponding
                        desired value. The list is terminated with 0. No
                        properties are currently supported with this
                        version of the extension.
                        <code class="varname">properties</code> can be NULL.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> errcode_ret </code> </span>
            </dt>
            <dd>
              <p>
                    </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
            <code class="function">clCreateFromEGLImageKHR</code> creates an
            EGLImage target of type <span class="type">cl_mem</span> from the
            EGLImage source provided as <code class="varname">image</code>.
        </p>
        <h4><a id="id-1.6.3"></a>Lifetime of Shared Objects</h4>
        <p>
            An OpenCL memory object created from an EGL image
            remains valid according to the lifetime
            behaviour as described in EGL_KHR_image_base.
        </p>
        <p>
            "Any EGLImage siblings exist in any client API context"
        </p>
        <p>
            For OpenCL this means that while the application
            retains a reference on the <span class="type">cl_mem</span> (EGL
            sibling) the image remains valid.
        </p>
        <h4><a id="id-1.6.7"></a>Synchronizing OpenCL and EGL Access to Shared Objects</h4>
        <p>
            In order to ensure data integrity, the application is responsible for synchronizing access to shared
            CL/EGL objects by their respective APIs. Failure to provide such synchronization may result in
            race conditions and other undefined behavior including non-portability between
            implementations.
        </p>
        <p>
            Prior to calling
            <a class="citerefentry" href="clEnqueueAcquireEGLObjectsKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueAcquireEGLObjectsKHR</span></span></a>,
            the application must ensure that any
            pending operations which access the objects specified in
            <code class="varname">mem_objects</code> have completed. This may
            be accomplished in a portable way by ceasing all client
            operations on the resource, and issuing
            and waiting for completion of a <code class="function">glFinish</code>
            command on all GL contexts with pending references to
            these objects. Implementations may offer more efficient
            synchronization methods, such as
            synchronisation primitives or fence operations.
        </p>
        <p>
            
            Similarly, after calling
            <code class="function">clEnqueueReleaseEGLImageObjects</code>,
            the application is responsible for
            ensuring that any pending OpenCL operations which access
            the objects specified in <code class="varname">mem_objects</code>
            have completed prior to executing subsequent
            commands in other APIs which reference these
            objects. This may be accomplished in a portable way by calling
            <a class="citerefentry" href="clWaitForEvents.html"><span class="citerefentry"><span class="refentrytitle">clWaitForEvents</span></span></a>
            with the event
            object returned by
            <a class="citerefentry" href="clEnqueueReleaseGLObjects.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseGLObjects</span></span></a> ,
             or by calling
            <a class="citerefentry" href="clFinish.html"><span class="citerefentry"><span class="refentrytitle">clFinish</span></span></a>.
            As above, some
            implementations may offer more efficient methods.
        </p>
        <p>
            Attempting to access the data store of an EGLImage object after it has been acquired by OpenCL
            and before it has been released will result in undefined behavior. Similarly, attempting to access
            a shared EGLImage object from OpenCL before it has been acquired by the OpenCL command
            queue or after it has been released, will result in undefined behavior.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <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 OpenCL context.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">properties</code>
                contains invalid values, if <code class="varname">display</code> is not a valid
                display object or if <code class="varname">flags</code> are
                not in the set defined above.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EGL_OBJECT_KHR</span> if <code class="varname">image</code>
                    is not a valid EGLImage object.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_IMAGE_FORMAT_NOT_SUPPORTED</span>
                if the OpenCL implementation is not able to
                create a <span class="type">cl_mem</span> compatible with the provided
                <span class="type">CLeglImageKHR</span> for an implementation-dependent
                reason (this could be caused by, but not limited to, reasons such as
                unsupported texture formats, etc).
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if there are
                no devices in <code class="varname">context</code> that support images (i.e.
                <code class="constant">CL_DEVICE_IMAGE_SUPPORT</code> specified in
                table 4.3 (see <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>) is
                <code class="constant">CL_FALSE</code>) or if the
                flags passed are not supported for that image type.
            </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-2.1-extensions.pdf#page=167" 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>
        </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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