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| <title>clEnqueueReadBufferRect</title> |
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| <meta name="keywords" content="clEnqueueReadBufferRect" /> |
| </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="clEnqueueReadBufferRect"></a> |
| <h1> |
| clEnqueueReadBufferRect |
| </h1> |
| <p> |
| Enqueue command to read from a 2D or 3D rectangular region from a buffer object to host memory. |
| </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">clEnqueueReadBufferRect</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">buffer</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_bool" target="pagedisplay">cl_bool</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">blocking_read</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">size_t</a> |
| * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">buffer_origin</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">size_t</a> |
| * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">host_origin</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">size_t</a> |
| * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">region</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">buffer_row_pitch</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">buffer_slice_pitch</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">host_row_pitch</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">host_slice_pitch</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <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">*ptr</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> |
| Is is a valid host command-queue in which the read command will be |
| queued. <code class="varname">command_queue</code> and <code class="varname">buffer</code> |
| must be created with the same OpenCL context. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">buffer</code> |
| </span> |
| </dt> |
| <dd> |
| <p>Refers to a valid buffer object.</p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">blocking_read</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Indicates if the read operations are <code class="varname">blocking</code> or |
| <code class="varname">non-blocking</code>. |
| </p> |
| <p> |
| If <code class="varname">blocking_read</code> is <code class="constant">CL_TRUE</code> i.e. |
| the read command is blocking, <code class="function">clEnqueueReadBufferRect</code> |
| does not return until the buffer data has been read and copied into memory |
| pointed to by <code class="varname">ptr</code>. |
| </p> |
| <p> |
| If <code class="varname">blocking_read</code> is <code class="constant">CL_FALSE</code> |
| i.e. the read command is non-blocking, |
| <code class="function">clEnqueueReadBufferRect</code> queues a non-blocking read |
| command and returns. The contents of the buffer that <code class="varname">ptr</code> |
| points to cannot be used until the read command has completed. The |
| <code class="varname">event</code> argument argument returns an event object which |
| can be used to query the execution status of the read command. When the read |
| command has completed, the contents of the buffer that <code class="varname">ptr</code> |
| points to can be used by the application. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">buffer_origin</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The (<span class="emphasis"><em>x, y, z</em></span>) offset in the memory |
| region associated with <code class="varname">buffer</code>. For a 2D |
| rectangle region, the <code class="varname">z</code> value given by |
| <code class="varname">buffer_origin</code>[2] should be 0. The offset |
| in bytes is computed as <code class="varname">buffer_origin</code>[2] * |
| <code class="varname">buffer_slice_pitch</code> + <code class="varname">buffer_origin</code>[1] |
| * <code class="varname">buffer_row_pitch</code> + <code class="varname">buffer_origin</code>[0]. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">host_origin</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The (<span class="emphasis"><em>x, y, z</em></span>) offset in the memory region pointed to by |
| <code class="varname">ptr</code>. For a 2D rectangle region, the <code class="varname">z</code> |
| value given by <code class="varname">host_origin</code>[2] should be 0. The |
| offset in bytes is computed as <code class="varname">host_origin</code>[2] * |
| <code class="varname">host_slice_pitch</code> + <code class="varname">host_origin</code>[1] |
| * <code class="varname">host_row_pitch</code> + <code class="varname">host_origin</code>[0]. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">region</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The (<code class="varname">width</code> in bytes, <code class="varname">height</code> in rows, |
| <code class="varname">depth</code> in slices) of the 2D or 3D rectangle |
| being read or written. For a 2D rectangle copy, the <code class="varname">depth</code> |
| value given by <code class="varname">region</code>[2] should be 1. |
| The values in region cannot be 0. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">buffer_row_pitch</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The length of each row in bytes to be used for the memory region associated |
| with <code class="varname">buffer</code>. If <code class="varname">buffer_row_pitch</code> |
| is 0, <code class="varname">buffer_row_pitch</code> is computed as |
| <code class="varname">region</code>[0]. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">buffer_slice_pitch</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The length of each 2D slice in bytes to be used for the memory region associated |
| with <code class="varname">buffer</code>. If <code class="varname">buffer_slice_pitch</code> is 0, |
| <code class="varname">buffer_slice_pitch</code> is computed as <code class="varname">region</code>[1] |
| * <code class="varname">buffer_row_pitch</code>. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">host_row_pitch</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The length of each row in bytes to be used for the memory region pointed |
| to by <code class="varname">ptr</code>. If <code class="varname">host_row_pitch</code> is 0, |
| <code class="varname">host_row_pitch</code> is computed as <code class="varname">region</code>[0]. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">host_slice_pitch</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The length of each 2D slice in bytes to be used for the memory region pointed |
| to by <code class="varname">ptr</code>. If <code class="varname">host_slice_pitch</code> |
| is 0, <code class="varname">host_slice_pitch</code> is computed as |
| <code class="varname">region</code>[1] * <code class="varname">host_row_pitch</code>. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname">ptr </code> </span> |
| </dt> |
| <dd> |
| <p> |
| The pointer to buffer in host memory where data is to be read into. |
| </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> |
| <code class="varname">event_wait_list</code> |
| and <code class="varname">num_events_in_wait_list</code> 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 read 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. |
| 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="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| Calling <code class="function">clEnqueueReadBufferRect</code> to read a region of the buffer |
| object with the <code class="varname">ptr</code> argument value set to <code class="varname">host_ptr</code> |
| and <code class="varname">host_origin</code>, <code class="varname">buffer_origin</code> |
| values are the same, where <code class="varname">host_ptr</code> is a pointer to the |
| memory region specified when the buffer object being read is created with |
| <code class="constant">CL_MEM_USE_HOST_PTR</code>, must meet the same requirements given for |
| <a class="citerefentry" href="clEnqueueReadBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBuffer</span></span></a>: |
| </p> |
| <p> |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| All commands that use this buffer object or a memory object (buffer or image) created |
| from this buffer object have finished execution before the read command begins |
| execution. |
| </li> |
| <li class="listitem"> |
| The buffer object or memory objects created from this buffer object are not mapped. |
| </li> |
| <li class="listitem"> |
| The buffer object or memory objects created from this buffer object are not used |
| by any command-queue until the read command has finished execution. |
| </li> |
| </ul> |
| </div> |
| <p> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">clEnqueueReadBufferRect</code> 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> and <code class="varname">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">buffer</code> is not |
| a valid buffer object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if the region being read |
| specified by (<code class="varname">buffer_origin</code>, <code class="varname">region</code>, |
| <code class="varname">buffer_row_pitch</code>, <code class="varname">buffer_slice_pitch</code>) |
| is out of bounds. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">ptr</code> is a NULL value. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if any <code class="varname">region</code> array |
| element is 0. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">buffer_row_pitch</code> |
| is not 0 and is less than <code class="varname">region</code>[0]. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">host_row_pitch</code> |
| is not 0 and is less than <code class="varname">region</code>[0]. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">buffer_slice_pitch</code> |
| is not 0 and is less than <code class="varname">region</code>[1] * |
| <code class="varname">buffer_row_pitch</code> and not a multiple of |
| <code class="varname">buffer_row_pitch</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">host_slice_pitch</code> is not |
| 0 and is less than <code class="varname">region</code>[1] * <code class="varname">host_row_pitch</code> |
| and not a multiple of <code class="varname">host_row_pitch</code>. |
| </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> > 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">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_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST</span> if the read |
| and write operations are blocking and the execution status of any of the events |
| in <code class="varname">event_wait_list</code> is a negative integer value. |
| </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">buffer</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if |
| <code class="function">clEnqueueReadBufferRect</code> is called on <code class="varname">buffer</code> |
| which has been created with <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> or |
| <code class="constant">CL_MEM_HOST_NO_ACCESS</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#page=112" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clEnqueueCopyBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBuffer</span></span></a>, |
| <a class="citerefentry" href="clEnqueueCopyBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBufferRect</span></span></a>, |
| <a class="citerefentry" href="clEnqueueWriteBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBuffer</span></span></a>, |
| <a class="citerefentry" href="clEnqueueWriteBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBufferRect</span></span></a>, |
| <a class="citerefentry" href="clEnqueueReadBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBuffer</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> |
| </body> |
| </html> |
