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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 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 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> | |
| </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"> | |
| <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-2.1.pdf#page=107" 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 © 2007-2015 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. | |
| </div> | |
| </div> | |
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| </html> |