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  <body>
    <div class="refentry">
      <a id="idm1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clCreateSubBuffer"></a>
        <h1>
            clCreateSubBuffer
        </h1>
        <p>
            Creates a new buffer object (referred to as a sub-buffer object) from an existing buffer object.
        </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">clCreateSubBuffer</strong>
                (</code>
                <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">buffer</var>, </td>
              </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><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_buffer_create_type" target="pagedisplay">cl_buffer_create_type</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">buffer_create_type</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <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">*buffer_create_info</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">buffer</code>
              </span>
            </dt>
            <dd>
              <p>A valid object and cannot be a sub-buffer object.</p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname">flags</code>
                </span>
            </dt>
            <dd>
              <p>
                      A bit-field that is used to specify allocation and
                      usage information about the sub-buffer memory object
                      being created and is described in the table below.  If the
                      <code class="constant">CL_MEM_READ_WRITE</code>, <code class="constant">CL_MEM_READ_ONLY</code>
                      or <code class="constant">CL_MEM_WRITE_ONLY</code> values are not
                      specified in <code class="varname">flags</code>, they are inherited
                      from the corresponding memory access qualifers associated with
                      <code class="varname">buffer</code>. The <code class="constant">CL_MEM_USE_HOST_PTR</code>,
                      <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> and
                      <code class="constant">CL_MEM_COPY_HOST_PTR</code> values cannot
                      be specified in <code class="varname">flags</code> but are inherited
                      from the corresponding memory access qualifiers associated with
                      <code class="varname">buffer</code>.  If <code class="constant">CL_MEM_COPY_HOST_PTR</code>
                      is specified in  the memory access qualifier values associated with
                      <code class="varname">buffer</code> it does not imply any additional copies
                      when the sub-buffer is created from <code class="varname">buffer</code>.
                      If the <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> values are not specified in
                      <code class="varname">flags</code>, they are inherited from the corresponding memory
                      access qualifiers associated with <code class="varname">buffer</code>.
                    </p>
              <div class="informaltable">
                <table class="informaltable" border="1">
                  <colgroup>
                    <col align="left" class="col1" />
                    <col />
                  </colgroup>
                  <thead>
                    <tr>
                      <th align="left">cl_mem_flags</th>
                      <th align="left">Description</th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_READ_WRITE</code>
                      </td>
                      <td align="left">
              This flag specifies that the memory object will be read and written by a kernel. This
              is the default.
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_WRITE_ONLY</code>
                      </td>
                      <td align="left">
              <p>
                This flags specifies that the memory object will be written but not read by
                a kernel.
              </p>

              <p>
                Reading from a buffer or image object created with
                <code class="constant">CL_MEM_WRITE_ONLY</code> inside a kernel is undefined.
              </p>

              <p>
                <code class="constant">CL_MEM_READ_WRITE</code> and <code class="constant">CL_MEM_WRITE_ONLY</code>
                are mutually exclusive.
              </p>
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_READ_ONLY</code>
                      </td>
                      <td align="left">
              <p>
                This flag specifies that the memory object is a read-only memory object when
                used inside a kernel.
              </p>

              <p>
                Writing to a buffer or image object created with
                <code class="constant">CL_MEM_READ_ONLY</code> inside a kernel is undefined.
              </p>

              <p>
                <code class="constant">CL_MEM_READ_WRITE</code> or <code class="constant">CL_MEM_WRITE_ONLY</code>
                and <code class="constant">CL_MEM_READ_ONLY</code> are mutually exclusive.
              </p>
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_USE_HOST_PTR</code>
                      </td>
                      <td align="left">
              <p>
                This flag is valid only if <code class="varname">host_ptr</code> is not NULL. If
                specified, it indicates that the application wants the OpenCL implementation
                to use memory referenced by <code class="varname">host_ptr</code> as the storage bits
                for the memory object.
              </p>

              <p>
                OpenCL implementations are allowed to cache the buffer contents pointed to by
                <code class="varname">host_ptr</code> in device memory. This cached copy can be used when
                kernels are executed on a device.
              </p>

              <p>
                The result of OpenCL commands that operate on multiple buffer objects created with
                the same <code class="varname">host_ptr</code> or overlapping host regions is considered
                to be undefined.
              </p>

              <p>
                Refer to the <a class="citerefentry" href="dataTypes.html"><span class="citerefentry"><span class="refentrytitle">description
                of the alignment rules</span></span></a> for
                <code class="varname">host_ptr</code> for memory objects (buffer and images) created
                using <code class="constant">CL_MEM_USE_HOST_PTR</code>.
              </p>
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_ALLOC_HOST_PTR</code>
                      </td>
                      <td align="left">
              <p>
                This flag specifies that the application wants the OpenCL implementation to
                allocate memory from host accessible memory.
              </p>

              <p>
                <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> and
                <code class="constant">CL_MEM_USE_HOST_PTR</code> are mutually exclusive.
              </p>
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_COPY_HOST_PTR</code>
                      </td>
                      <td align="left">
              <p>
                This flag is valid only if <code class="varname">host_ptr</code> is not NULL. If specified,
                it indicates that the application wants the OpenCL implementation to allocate
                memory for the memory object and copy the data from memory referenced by
                <code class="varname">host_ptr</code>.
              </p>

              <p>
                <code class="constant">CL_MEM_COPY_HOST_PTR</code> and
                <code class="constant">CL_MEM_USE_HOST_PTR</code> are mutually exclusive.
              </p>

              <p>
                <code class="constant">CL_MEM_COPY_HOST_PTR</code> can be used with
                <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> to initialize the contents of the
                <span class="type">cl_mem</span> object allocated using host-accessible (e.g.  PCIe) memory.
              </p>
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_HOST_WRITE_ONLY</code>
                      </td>
                      <td align="left">
              <p>
                This flag specifies that the host will only write to the memory object (using
                OpenCL APIs that enqueue a write or a map for write).  This can be used to optimize
                write access from the host (e.g. enable write combined allocations for memory
                objects for devices that communicate with the host over a system bus such as PCIe).
              </p>
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_HOST_READ_ONLY</code>
                      </td>
                      <td align="left">
              <p>
                This flag specifies that the host will only read the memory object (using OpenCL
                APIs that enqueue a read or a map for read).
              </p>

              <p>
                <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> and
                <code class="constant">CL_MEM_HOST_READ_ONLY</code> are mutually exclusive.
              </p>
            </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_MEM_HOST_NO_ACCESS</code>
                      </td>
                      <td align="left">
              <p>
                This flag specifies that the host will not read or write the memory object.
              </p>

              <p>
                <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> or
                <code class="constant">CL_MEM_HOST_READ_ONLY</code> and
                <code class="constant">CL_MEM_HOST_NO_ACCESS</code> are mutually exclusive.
              </p>
            </td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
            <dt>
              <span class="term"><code class="varname">buffer_create_type</code> and <code class="varname">buffer_create_info</code></span>
            </dt>
            <dd>
              <p>
                  Describes the type of buffer object to be created. The list of supported values
                  for <code class="varname">buffer_create_type</code> and corresponding descriptor that
                  <code class="varname">buffer_create_info</code> points to is described below.
                </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_buffer_create_type</th>
                      <th align="left">Description</th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">CL_BUFFER_CREATE_TYPE_REGION</td>
                      <td align="left">
                          <p>
                            Create a buffer object that represents a specific region in
                            <code class="varname">buffer</code>.
                          </p>

                          <p>
                            <code class="varname">buffer_create_info</code> is a pointer to the following
                            structure:
                          </p>

                          <div class="literallayout"><p><br />
typedef struct _cl_buffer_region {<br />
    size_t origin;<br />
    size_t size;<br />
} cl_buffer_region;<br />
                          </p></div>

                          <p>
                            (<code class="varname">origin, size</code>) defines the offset and size in
                            bytes in <code class="varname">buffer</code>.
                          </p>

                          <p>
                            If <code class="varname">buffer</code> is created with
                            <code class="constant">CL_MEM_USE_HOST_PTR</code>, the <code class="varname">host_ptr</code>
                            associated with the buffer object returned is <code class="varname">host_ptr</code>
                            + <code class="varname">origin</code>.
                          </p>

                          <p>
                            The buffer object returned references the data store allocated for
                            <code class="varname">buffer</code> and points to a specific region given by
                            (<code class="varname">origin, size</code>) in this data store.
                          </p>

                          <p>
                            <code class="constant">CL_INVALID_VALUE</code> is returned in
                            <code class="varname">errcode_ret</code> if the region specified by
                            (<code class="varname">origin, size</code>) is out of bounds in
                            <code class="varname">buffer</code>.
                          </p>

                          <p>
                            <code class="constant">CL_INVALID_BUFFER_SIZE</code> if <code class="varname">size</code>
                            is 0.
                          </p>

                          <p>
                            <code class="constant">CL_MISALIGNED_SUB_BUFFER_OFFSET</code> is
                            returned in <code class="varname">errcode_ret</code> if there are no
                            devices in context associated with <code class="varname">buffer</code>
                            for which the <code class="varname">origin</code> value is aligned to the
                            <code class="constant">CL_DEVICE_MEM_BASE_ADDR_ALIGN</code> value.
                          </p>
                        </td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          Concurrent reading from, writing to and copying between both a buffer object and
          its sub-buffer object(s) is undefined.  Concurrent reading from, writing to and
          copying between overlapping sub-buffer objects created with the same buffer object
          is undefined.  Only reading from both a buffer object and its sub-buffer objects or
          reading from multiple overlapping sub-buffer objects is defined.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns a valid non-zero buffer object and <code class="varname">errcode_ret</code>
          is set to <span class="errorname">CL_SUCCESS</span> if the buffer object is
          created successfully. Otherwise, it returns one of the following error in
          <code class="varname">errcode_ret</code>:
        </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_MEM_OBJECT</span> if <code class="varname">buffer</code> is not
              a valid buffer object or is a sub-buffer object.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">buffer</code> was created
              with <code class="constant">CL_MEM_WRITE_ONLY</code> and <code class="varname">flags</code> specifies
              <code class="constant">CL_MEM_READ_WRITE</code> or <code class="constant">CL_MEM_READ_ONLY</code>, or
              if <code class="varname">buffer</code> was created with <code class="constant">CL_MEM_READ_ONLY</code>
              and <code class="varname">flags</code> specifies <code class="constant">CL_MEM_READ_WRITE</code>
              or <code class="constant">CL_MEM_WRITE_ONLY</code>, or if <code class="varname">flags</code>
              specifies <code class="constant">CL_MEM_USE_HOST_PTR</code>
              or <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> or
              <code class="constant">CL_MEM_COPY_HOST_PTR</code>.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">buffer</code> was created with
              <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> and <code class="varname">flags</code> specifies
              <code class="constant">CL_MEM_HOST_READ_ONLY</code> or if <code class="varname">buffer</code>
              was created with <code class="constant">CL_MEM_HOST_READ_ONLY</code> and
              <code class="varname">flags</code> specifies <code class="constant">CL_MEM_HOST_WRITE_ONLY</code>, or if
              <code class="varname">buffer</code> was created with <code class="constant">CL_MEM_HOST_NO_ACCESS</code>
              and <code class="varname">flags</code> specifies <code class="constant">CL_MEM_HOST_READ_ONLY</code>
              or <code class="constant">CL_MEM_HOST_WRITE_ONLY</code>.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if value specified in
              <code class="varname">buffer_create_type</code> is not valid.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if value(s) specified
              in <code class="varname">buffer_create_info</code> (for a given
              <code class="varname">buffer_create_type</code>) is not valid or if
              <code class="varname">buffer_create_info</code> is NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_BUFFER_SIZE</span> if size is 0.
            </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 sub-buffer object.
            </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="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=69" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>,
            <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="clEnqueueCopyBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBuffer</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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