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| <title>clCreateSubBuffer</title> |
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| </head> |
| <body> |
| <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="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 buffer 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 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 flag 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 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"> |
| <code class="constant">CL_BUFFER_CREATE_TYPE_REGION</code> |
| </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 <span class="errorname">CL_SUCCESS</span> if the function is executed |
| successfully. Otherwise, it |
| returns one of the following errors 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="https://www.khronos.org/registry/cl/specs/opencl-2.0.pdf#page=97" 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 © 2007-2013 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 |
| 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. |
| </div> |
| </div> |
| </body> |
| </html> |
