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<title>clEnqueueWriteBufferRect</title>
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</head>
<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="clEnqueueWriteBufferRect"></a>
<h1>
clEnqueueWriteBufferRect
</h1>
<p>
Enqueue commands to write a 2D or 3D rectangular region to a buffer object from 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">clEnqueueWriteBufferRect</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_write</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>
Refers to the command-queue in which the write 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_write</code>
</span>
</dt>
<dd>
<p>
Indicates if the write
operations are <code class="varname">blocking</code> or non-blocking. If
<code class="varname">blocking_write</code> is <code class="constant">CL_TRUE</code>, the
OpenCL implementation copies the data referred to by <code class="varname">ptr</code>
and enqueues the write operation in the command-queue. The memory pointed
to by <code class="varname">ptr</code> can be reused by the application after the
<code class="function">clEnqueueWriteBufferRect</code> call returns.
</p>
<p>
If <code class="varname">blocking_write</code> is <code class="constant">CL_FALSE</code>,
the OpenCL implementation will use <code class="varname">ptr</code> to perform a
nonblocking write. As the write is non-blocking the implementation can
return immediately. The memory pointed to by <code class="varname">ptr</code>
cannot be reused by the application after the call returns. The
<code class="varname">event</code> argument returns an event object which can be
used to query the execution status of the write command. When the write
command has completed, the memory pointed to by <code class="varname">ptr</code>
can then be reused 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 (<span class="emphasis"><em>width, height, depth</em></span>) in bytes 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.
</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 written from.
</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 event_wait_list 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 write 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.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
Calling <code class="function">clEnqueueWriteBufferRect</code> to update the latest bits
in 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 written is created with <code class="constant">CL_MEM_USE_HOST_PTR</code>,
must meet the following requirements in order to avoid undefined behavior:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
The host memory region given by (<code class="varname">buffer_origin region</code>)
contains the latest bits when the enqueued write 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 write command has finished execution.
</li>
</ul>
</div>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
<code class="function">clEnqueueWriteBufferRect</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 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 region 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">clEnqueueWriteBufferRect</code> is called on <code class="varname">buffer</code>
which has been created with <code class="constant">CL_MEM_HOST_READ_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="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=75" 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="clEnqueueReadBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBufferRect</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 © 2007-2011 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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