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    <title>clEnqueueCopyBuffer</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="clEnqueueCopyBuffer"></a>
        <h1>
            clEnqueueCopyBuffer
        </h1>
        <p>
            Enqueues a command to copy from one buffer object to another.
        </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">clEnqueueCopyBuffer </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="abstractDataTypes.html" target="pagedisplay">cl_mem</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">src_buffer</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_mem</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">dst_buffer</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">src_offset</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">dst_offset</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">size</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>
                      The host command-queue in which the copy command will be queued. The
                      OpenCL context associated with <code class="varname">command_queue</code>,
                      <code class="varname">src_buffer</code>, and <code class="varname">dst_buffer</code> must be
                      the same.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> src_offset </code> </span>
            </dt>
            <dd>
              <p>
                        The offset where to begin copying data from <code class="varname">src_buffer</code>.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> dst_offset </code> </span>
            </dt>
            <dd>
              <p>
                        The offset where to begin copying data into <code class="varname">dst_buffer</code>.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname">size</code> </span>
            </dt>
            <dd>
              <p>
                        Refers to the size in bytes to copy.
                    </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. The context associated with events in
                      <code class="varname">event_wait_list</code> and <code class="varname">command_queue</code> must
                      be the same.  The memory associated with <code class="varname">event_wait_list</code>
                      can be reused or freed after the function returns.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> event </code> </span>
            </dt>
            <dd>
              <p>
                      Returns an event object that identifies this particular copy command
                      and can be used to query or queue a wait for this particular
                      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.
                      <a class="citerefentry" href="clEnqueueBarrierWithWaitList.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueBarrierWithWaitList</span></span></a>
                      can be used instead.  If the <code class="varname">event_wait_list</code>
                      and the <code class="varname">event</code> arguments are not NULL, the
                      <code class="varname">event</code> argument should not refer to an element of the
                      <code class="varname">event_wait_list</code> array.
                    </p>
            </dd>
          </dl>
        </div>
      </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 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_COMMAND_QUEUE</span> if <code class="varname">command_queue</code>
              is not a valid host command-queue.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if the context associated
              with <code class="varname">command_queue</code>, <code class="varname">src_buffer</code>, and
              <code class="varname">dst_buffer</code> are not the same or if the context associated with
              <code class="varname">command_queue</code> and events in <code class="varname">event_wait_list</code>
              are not the same.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if <code class="varname">src_buffer</code>
              and <code class="varname">dst_buffer</code> are not valid buffer objects.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">src_offset</code>,
              <code class="varname">dst_offset</code>, <code class="varname">size</code>, <code class="varname">src_offset</code>
              + <code class="varname">size</code>, or <code class="varname">dst_offset</code> + <code class="varname">size</code>
              require accessing elements outside the <code class="varname">src_buffer</code> and
              <code class="varname">dst_buffer</code> buffer objects respectively.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">size</code> is 0.
            </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> is &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_MISALIGNED_SUB_BUFFER_OFFSET </span> if
              <code class="varname">src_buffer</code> is a sub-buffer object and <code class="varname">offset</code>
              specified when the sub-buffer object is created is not aligned to
              <code class="constant">CL_DEVICE_MEM_BASE_ADDR_ALIGN</code> value for device associated
              with <code class="varname">queue</code>.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MISALIGNED_SUB_BUFFER_OFFSET </span> if
              <code class="varname">dst_buffer</code> is a sub-buffer object and <code class="varname">offset</code>
              specified when the sub-buffer object is created is not aligned to
              <code class="constant">CL_DEVICE_MEM_BASE_ADDR_ALIGN</code> value for device associated
              with <code class="varname">queue</code>.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_COPY_OVERLAP</span> if <code class="varname">src_buffer</code>
              and <code class="varname">dst_buffer</code> are the same buffer or subbuffer object and
              the source and destination regions overlap or if <code class="varname">src_buffer</code>
              and <code class="varname">dst_buffer</code> are different sub-buffers of the same associated
              buffer object and they overlap. The regions overlap if <code class="varname">src_offset</code>
              ≤ <code class="varname">dst_offset</code> ≤ <code class="varname">src_offset</code> + size -
              1, or if <code class="varname">dst_offset</code> ≤ <code class="varname">src_offset</code> ≤
              <code class="varname">dst_offset</code> + size - 1.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a failure
              to allocate memory for data store associated with <code class="varname">src_buffer</code>
              or <code class="varname">dst_buffer</code>.
            </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.pdf#namedest=clEnqueueCopyBuffer" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <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="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>,
            <a class="citerefentry" href="clCreateSubBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateSubBuffer</span></span></a>,
            <a class="citerefentry" href="clEnqueueCopyBufferToImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBufferToImage</span></span></a>,
            <a class="citerefentry" href="clEnqueueCopyImageToBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImageToBuffer</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
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