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<!ENTITY sharingDX9Inc SYSTEM "sharingDX9Inc.xml">
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<!-- ================================ SYNOPSIS -->
<refnamediv id="clEnqueueAcquireDX9MediaSurfacesKHR">
<refpurpose>Acquire OpenCL memory objects that have been created from a media surface.</refpurpose>
<refsynopsisdiv xmlns:xlink=""><title></title>
<link xlink:href="scalarDataTypes.html">cl_int</link>
<paramdef><link xlink:href="abstractDataTypes.html">cl_command_queue</link>
<paramdef><link xlink:href="scalarDataTypes.html">cl_uint</link>
<paramdef>const <link xlink:href="abstractDataTypes.html">cl_mem</link><parameter>*mem_objects</parameter></paramdef>
<paramdef><link xlink:href="scalarDataTypes.html">cl_uint</link><parameter>num_events_in_wait_list</parameter></paramdef>
const <link xlink:href="abstractDataTypes.html">cl_event</link>
<paramdef><link xlink:href="abstractDataTypes.html">cl_event</link><parameter>*event</parameter></paramdef>
<!-- ================================ PARAMETERS -->
<refsect1 id="parameters"><title>Parameters</title>
A valid command-queue.
The number of memory objects to be acquired in <varname>mem_objects</varname>.
A pointer to a list of OpenCL memory objects that were created from
media surfaces.
<term><varname>num_events_in_wait_list</varname>, <varname>event_wait_list</varname></term>
Specify events that need to complete before this particular
command can be executed. If <varname>event_wait_list</varname>
is NULL, then this particular command does not wait on any
event to complete. If <varname>event_wait_list</varname> is
NULL, <varname>num_events_in_wait_list</varname> must be 0. If
<varname>event_wait_list</varname> is not NULL, the list of events
pointed to by <varname>event_wait_list</varname> must be valid and
<varname>num_events_in_wait_list</varname> must be greater than 0. The events
specified in <varname>event_wait_list</varname> act as synchronization points.
Returns <replaceable>n</replaceable> event object that identifies this particular
command and can be used to query or queue a wait for this particular command
to complete. <varname>event</varname> 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 <varname>event_wait_list</varname> and the
<varname>event</varname> arguments are not NULL, the
argument should not refer to an element of the
<varname>event_wait_list</varname> array.
</varlistentry> </variablelist>
<!-- ================================ NOTES -->
<refsect1 id="notes"><title>Notes</title>
Used to acquire OpenCL memory objects that have been created from a media
surface. The media surfaces are acquired by the OpenCL context associated with
<varname>command_queue</varname> and can therefore be used by all command-queues
associated with the OpenCL context.
OpenCL memory objects created from media surfaces must be acquired before they can
be used by any OpenCL commands queued to a command-queue. If an OpenCL memory
object created from a media surface is used while it is not currently acquired
by OpenCL, the call attempting to use that OpenCL memory object will return
If <constant>CL_CONTEXT_INTEROP_USER_SYNC</constant> is not
specified as <constant>CL_TRUE</constant> during context creation,
<function>clEnqueueAcquireDX9MediaSurfacesKHR</function> provides the synchronization
guarantee that any media adapter API calls involving the interop device(s) used in the
OpenCL context made before <function>clEnqueueAcquireDX9MediaSurfacesKHR</function>
is called will complete executing before <varname>event</varname> reports
completion and before the execution of any subsequent OpenCL work issued
in <varname>command_queue</varname> begins. If the context was created with
properties specifying <constant>CL_CONTEXT_INTEROP_USER_SYNC</constant> as
<constant>CL_TRUE</constant>, the user is responsible for guaranteeing that any
media adapter API calls involving the interop device(s) used in the OpenCL context
made before <function>clEnqueueAcquireDX9MediaSurfacesKHR</function> is called have
completed before calling <function>clEnqueueAcquireDX9MediaSurfacesKHR</function>.
<!-- ================================ ERRORS -->
<refsect1 id="errors"><title>Errors</title>
Returns <errorname>CL_SUCCESS</errorname> returns <errorname>CL_SUCCESS</errorname>
if the function is executed successfully. If <varname>num_objects</varname> is 0 and
<varname>mem_objects</varname> is NULL then the function does nothing and returns
<errorname>CL_SUCCESS</errorname>. Otherwise it returns one of the following errors:
<itemizedlist mark="disc">
<errorname>CL_INVALID_VALUE</errorname> if <varname>num_objects</varname>
is zero and <varname>mem_objects</varname> is not a NULL value or if
<varname>num_objects</varname> &gt; 0 and <varname>mem_objects</varname> is NULL.
<errorname>CL_INVALID_MEM_OBJECT</errorname> if memory objects in
<varname>mem_objects</varname> are not valid OpenCL memory objects or if memory
objects in <varname>mem_objects</varname> have not been created from media surfaces.
<errorname>CL_INVALID_COMMAND_QUEUE</errorname> if <varname>command_queue</varname>
is not a valid command-queue.
<errorname>CL_INVALID_CONTEXT</errorname> if context associated with
<varname>command_queue</varname> was not created from a device that can share
the media surface referenced by <varname>mem_objects</varname>.
<errorname>CL_DX9_MEDIA_SURFACE_ALREADY_ACQUIRED_KHR</errorname> if memory
objects in <varname>mem_objects</varname> have previously been acquired
using <function>clEnqueueAcquireDX9MediaSurfacesKHR</function>
but have not been released using
if <varname>event_wait_list</varname> is NULL and
<varname>num_event_in_wait_list</varname> &gt; 0,
or <varname>event_wait_list</varname> is not NULL and
<varname>num_event_in_wait_list</varname> is 0, or if event objects in
<varname>event_wait_list</varname> are not valid events.
<errorname>CL_OUT_OF_HOST_MEMORY</errorname> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
<!-- ================================ EXAMPLE -->
<refsect2 id="example1">
<informaltable frame="none">
<tgroup cols="1" align="left" colsep="0" rowsep="0">
<colspec colname="col1" colnum="1" />
Example goes here - it will be set in "code" type with white space preserved.
<!-- ================================ SPECIFICATION -->
<!-- Set the "uri" attribute in the <olink /> element to the "named destination" for the PDF page
<refsect1 id="specification"><title>Specification</title>
<para><imageobject><imagedata fileref="pdficon_small1.gif" format="gif" /></imageobject>
<olink uri="clEnqueueAcquireDX9MediaSurfacesKHR">OpenCL Specification</olink>
<!-- ================================ ALSO SEE -->
<refsect1 id="seealso"><title>Also see</title>
<!-- ============================== COPYRIGHT -->
<!-- Content included from -->
<refsect3 id="Copyright"><title></title>
<imagedata fileref="KhronosLogo.jpg" format="jpg" />
<para />
<!-- 26-Oct-2015, Ext rev. 10 -->