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<title>clEnqueueWriteBufferRect</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="clEnqueueWriteBufferRect"></a>
<h1>
clEnqueueWriteBufferRect
</h1>
<p>
Enqueue command 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>
Is is a valid host 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 <code class="varname">non-blocking</code>. 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 (<code class="varname">x, y, z</code>) 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 (<code class="varname">x, y, z</code>) 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 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 <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 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.
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">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 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 written
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> &gt; 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="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#page=113" 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>
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