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      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clGetDeviceIDsFromD3D10KHR"></a>
        <h1>clGetDeviceIDsFromD3D11KHR</h1>
        <p>Querying OpenCL Devices Corresponding to Direct3D 11 Devices.</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">clGetDeviceIDsFromD3D11KHR</strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_platform_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">platform</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_d3d10_device_source_khr" target="pagedisplay">cl_d3d11_device_source_khr</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">d3d_device_source</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*d3d_object</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_d3d10_device_set_khr" target="pagedisplay">cl_d3d11_device_set_khr</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">d3d_device_set</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_entries</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_device_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*devices</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_devices</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">platform</code>
              </span>
            </dt>
            <dd>
              <p>
                    Refers to the platform ID returned by
                    <a class="citerefentry" href="clGetPlatformIDs.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformIDs</span></span></a>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">d3d_device_source</code>
              </span>
            </dt>
            <dd>
              <p>
              Specifies the type of <code class="varname">d3d_object</code> and may be one of the following:.
            </p>
              <div class="informaltable">
                <table class="informaltable" border="1">
                  <colgroup>
                    <col align="left" class="col1" />
                    <col align="left" class="col2" />
                  </colgroup>
                  <thead>
                    <tr>
                      <th align="left">cl_d3d_device_source_khr</th>
                      <th align="left">Type of <code class="varname">d3d_object</code></th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_D3D11_DEVICE_KHR</code>
                      </td>
                      <td align="left">ID3D11Device *</td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_D3D11_DXGI_ADAPTER_KHR</code>
                      </td>
                      <td align="left">IDXGIAdapter *</td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">d3d_object</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the object whose corresponding OpenCL devices are being queried. The type of
                    <code class="varname">d3d_object</code> must be as specified in the table above.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">d3d_device_set</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the set of devices to return, and must be one of the following:
                </p>
              <div class="informaltable">
                <table class="informaltable" border="1">
                  <colgroup>
                    <col align="left" class="col1" />
                    <col align="left" class="col2" />
                  </colgroup>
                  <thead>
                    <tr>
                      <th align="left">cl_d3d_device_set_khr</th>
                      <th align="left">Devices returned in <code class="varname">devices</code></th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_PREFERRED_DEVICES_FOR_D3D11_KHR</code>
                      </td>
                      <td align="left">
                                The OpenCL devices associated with the specified Direct3D object.
                            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_ALL_DEVICES_FOR_D3D11_KHR</code>
                      </td>
                      <td align="left">
                                All OpenCL devices which may interoperate with the specified Direct3D object.
                                Performance of sharing data on these devices may be considerably less than on the
                                preferred devices.
                            </td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">num_entries</code>
              </span>
            </dt>
            <dd>
              <p>
                  The number of <span class="type">cl_device_id</span> entries that can be added to
                  <code class="varname">devices</code>. If <code class="varname">devices</code> is not NULL, the
                  <code class="varname">num_entries</code> must be greater than zero.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">devices</code>
              </span>
            </dt>
            <dd>
              <p>
                  Returns a list of OpenCL devices found. The <span class="type">cl_device_id</span> values
                  returned in <code class="varname">devices</code> can be used to identify a specific
                  OpenCL device. If <code class="varname">devices</code> is NULL, this argument is
                  ignored. The number of OpenCL devices returned is the mininum of the value
                  specified by <code class="varname">num_entries</code> and the number of OpenCL devices
                  corresponding to <code class="varname">d3d_object</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">num_devices</code>
              </span>
            </dt>
            <dd>
              <p>
                  Returns the number of OpenCL devices available that correspond to
                  <code class="varname">d3d_object</code>. If <code class="varname">num_devices</code> is NULL,
                  this argument is ignored.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
          The OpenCL devices corresponding to a Direct3D 11 device may be queried. The OpenCL
          devices corresponding to a DXGI adapter may also be queried. The OpenCL devices
          corresponding to a Direct3D 11 device will be a subset of the OpenCL devices
          corresponding to the DXGI adapter against which the Direct3D 11 device was created.
        </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
      General information about sharing memory objects with Direct3D 11 follows.
    </p>
        <p>
       The goal of this extension is to provide
      interoperability between OpenCL and Direct3D 11. This is designed to function analogously
      to the OpenGL interoperability. If this extension is
      supported by an implementation, the string       
      <a class="citerefentry" href="cl_khr_d3d11_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d11_sharing</span></span></a>
      will be present in the
      <code class="constant">CL_PLATFORM_EXTENSIONS</code> or <code class="constant">CL_DEVICE_EXTENSIONS</code> 
      string described in the table of allowed 
      values for <code class="varname">param_name</code> for 
      <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>.

    </p>
        <p>
      As currently proposed the interfaces for this extension would be provided in
      <code class="code">cl_d3d11.h</code>.
    </p>
        <p>
       This section discusses OpenCL functions that allow
      applications to use Direct3D 11 resources as OpenCL memory objects. This allows efficient
      sharing of data between OpenCL and Direct3D 11. The OpenCL API may be used to execute
      kernels that read and/or write memory objects that are also Direct3D 11 resources. An
      OpenCL image object may be created from a Direct3D 11 texture resource. An OpenCL buffer
      object may be created from a Direct3D 11 buffer resource. OpenCL memory objects may be
      created from Direct3D 11 objects if and only if the OpenCL context has been created from
      a Direct3D 11 device.
    </p>
        <p>
       An OpenCL memory object created from a
      Direct3D 11 resource remains valid as long as the corresponding Direct3D 11 resource has
      not been deleted. If the Direct3D 11 resource is deleted through the Direct3D 11 API,
      subsequent use of the OpenCL memory object will result in undefined behavior, including
      but not limited to possible OpenCL errors, data corruption, and program termination.
    </p>
        <p>
       The successful creation of a
      cl_context against a Direct3D 11 device specified via the context create parameter
      <code class="constant">CL_CONTEXT_D3D11_DEVICE_KHR</code> will increment the internal Direct3D
      reference count on the specified Direct3D 11 device. The internal Direct3D reference
      count on that Direct3D 11 device will be decremented when the OpenCL reference count on
      the returned OpenCL context drops to zero.
    </p>
        <p>
      The OpenCL context and corresponding command-queues are dependent on the
      existence of the Direct3D 11 device from which the OpenCL context was created. If the
      Direct3D 11 device is deleted through the Direct3D 11 API, subsequent use of the OpenCL
      context will result in undefined behavior, including but not limited to possible OpenCL
      errors, data corruption, and program termination.
    </p>
        <p>
       Properties of Direct3D 11 objects may be queried
      using <a class="citerefentry" href="clGetMemObjectInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetMemObjectInfo</span></span></a>
      and <a class="citerefentry" href="clGetImageInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetImageInfo</span></span></a>
      with <code class="varname">param_name</code> <code class="constant">CL_MEM_D3D11_RESOURCE_KHR</code> and
      <code class="constant">CL_IMAGE_D3D11_SUBRESOURCE_KHR</code> as described for <a class="citerefentry" href="clGetImageInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetImageInfo</span></span></a> and in the information 
below about accessing mapped regions of a memory object. 
    </p>
        <h4><a id="idm163"></a>Accessing mapped regions of a memory object</h4>
        <p>
      This section describes the behavior of OpenCL commands that access 
      mapped regions of a memory object.
    </p>
        <p>
        The contents of the region of a memory object and associated memory objects 
        (sub-buffer objects or 1D image buffer objects that overlap this region) mapped 
        for writing (i.e. <code class="constant">CL_MAP_WRITE</code> or 
        <code class="constant">CL_MAP_WRITE_INVALIDATE_REGION</code> is set in <code class="varname">map_flags</code> 
        argument to <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> 
        or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>) are 
        considered to be undefined until this region is unmapped.
    </p>
        <p>
        Multiple commands in command-queues can map a region or overlapping regions of a memory
        object and associated memory objects (sub-buffer objects or 1D image buffer objects that
        overlap this region) for reading (i.e. <code class="varname">map_flags</code> = <code class="constant">CL_MAP_READ</code>). 
        The contents of the regions of a memory object mapped for reading can also be read by kernels 
        and other OpenCL commands (such as 
        <a class="citerefentry" href="clEnqueueCopyBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBuffer</span></span></a>) executing on a device(s).
    </p>
        <p>
        Mapping (and unmapping) overlapped regions in a memory object and/or associated memory
        objects (sub-buffer objects or 1D image buffer objects that overlap this region) for writing 
        is an error and will result in <code class="constant">CL_INVALID_OPERATION</code> error returned by 
        <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> 
        or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>.
    </p>
        <p>
        If a memory object is currently mapped for writing, the application must ensure that the memory
        object is unmapped before any enqueued kernels or commands that read from or write to this
        memory object or any of its associated memory objects (sub-buffer or 1D image buffer objects)
        or its parent object (if the memory object is a sub-buffer or 1D image buffer object) begin
        execution; otherwise the behavior is undefined.
    </p>
        <p>
        If a memory object is currently mapped for reading, the application must ensure that the memory
        object is unmapped before any enqueued kernels or commands that write to this memory object
        or any of its associated memory objects (sub-buffer or 1D image buffer objects) or its parent
        object (if the memory object is a sub-buffer or 1D image buffer object) begin execution;
        otherwise the behavior is undefined.
    </p>
        <p>
        Accessing the contents of the memory region referred to by the mapped pointer that has 
        been unmapped is undefined.
    </p>
        <p>
        The mapped pointer returned by 
        <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> 
        or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> can be used as
        <code class="varname">ptr</code> argument value to 
        <a class="citerefentry" href="clEnqueueReadBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBuffer</span></span></a>, 
        <a class="citerefentry" href="clEnqueueWriteBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBuffer</span></span></a>, 
        <a class="citerefentry" href="clEnqueueReadBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBufferRect</span></span></a>, 
        <a class="citerefentry" href="clEnqueueWriteBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBufferRect</span></span></a>,
        <a class="citerefentry" href="clEnqueueReadImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadImage</span></span></a>, and 
        <a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a>, 
        provided the rules described above are adhered to.
    </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. Otherwise it may return:
        </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_PLATFORM</span> if <code class="varname">platform</code> is not
              a valid platform.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">d3d_device_source</code>
              is not a valid value, <code class="varname">d3d_device_set</code> is not a valid value,
              <code class="varname">num_entries</code> is equal to zero and <code class="varname">devices</code> is
              not NULL, or if both <code class="varname">num_devices</code> and <code class="varname">devices</code>
              are NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_DEVICE_NOT_FOUND</span> if no OpenCL devices that correspond
              to <code class="varname">d3d_object</code> were found.
            </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=102" 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_d3d11_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d11_sharing</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D11BufferKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D11BufferKHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D11Texture2DKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D11Texture2DKHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D11Texture3DKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D11Texture3DKHR</span></span></a>,
            <a class="citerefentry" href="clEnqueueAcquireD3D11ObjectsKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueAcquireD3D11ObjectsKHR</span></span></a>,
            <a class="citerefentry" href="clEnqueueReleaseD3D11ObjectsKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseD3D11ObjectsKHR</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
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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