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| <title>clCreateSubBuffer</title> |
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| <body> |
| <div class="refentry"> |
| <a id="idp26598784"></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 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="_top">cl_mem</a> <strong class="fsfunc">clCreateSubBuffer</strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">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="_top">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="_top">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="_top">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="_top">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. 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 image memory |
| object being created. The |
| following table describes the possible values for <code class="varname">flags</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 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> |
| </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> |
| </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 cl_mem object allocated using host-accessible (e.g. |
| PCIe) memory. |
| </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>The type of buffer object to be created. The supported value for <code class="varname">buffer_create_type</code> is CL_BUFFER_CREATE_TYPE_REGION, which create a buffer object that represents a specific region in <code class="varname">buffer</code>. <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 CL_MEM_USE_HOST_PTR, 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>CL_INVALID_VALUE 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>CL_MISALIGNED_SUB_BUFFER_OFFSET 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 CL_DEVICE_MEM_BASE_ADDR_ALIGN value.</p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">errcode_ret</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Returns an appropriate error code. If <code class="varname">errcode_ret</code> is NULL, no error code is returned. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| The implementation may return the same <a class="citerefentry" href="abstractDataTypes.html"><span class="citerefentry"><span class="refentrytitle">cl_mem</span></span></a> object with the reference count incremented |
| appropriately for multiple calls to <code class="function">clCreateSubBuffer</code> that use the same values for <code class="varname">buffer</code>, <code class="varname">flags</code>, <code class="varname">buffer_create_type</code> and <code class="varname">buffer_create_info</code> points to the same descriptor or descriptors that |
| describe values that are exactly the same. |
| </p> |
| <p> |
| The result of OpenCL commands that read from and write to multiple sub-buffer objects created |
| using <code class="function">clCreateSubBuffer</code> with the same buffer object but represent overlapping regions in the |
| buffer object is undefined. The result of OpenCL commands that read from and write to a buffer |
| object and its sub-buffer object(s) created using <code class="function">clCreateSubBuffer</code> with the same buffer object |
| is undefined. OpenCL commands that only read from multiple sub-buffer objects created using |
| <code class="function">clCreateSubBuffer</code> with the same buffer object but represent overlapping regions in the buffer |
| object or read from a buffer object and its sub-buffer objects should work as 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 values specified in <code class="varname">flags</code> are not valid; or if value specified in <code class="varname">buffer_create_type</code> is not valid; or 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_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-1.1.pdf#page=58" 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 © 2007-2010 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> |
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