'\" t
.\"     Title: clEnqueueReleaseDX9MediaSurfacesKHR
.\"    Author: The Khronos Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 01/14/2021
.\"    Manual: OpenCL Manual
.\"    Source: The Khronos Group
.\"  Language: English
.\"
.TH "CLENQUEUERELEASEDX9M" "3clc" "01/14/2021" "The Khronos Group" "OpenCL Manual"
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.SH "NAME"
clEnqueueReleaseDX9MediaSurfacesKHR \- Release OpenCL memory objects that have been created from media surfaces\&.
.SH ""
.HP \w'cl_int\ clEnqueueReleaseDX9MediaSurfacesKHR('u
.BI "cl_int clEnqueueReleaseDX9MediaSurfacesKHR(cl_command_queue\ " "command_queue" ", cl_uint\ " "num_objects" ", const\ cl_mem\ *" "mem_objects" ", cl_uint\ " "num_events_in_wait_list" ", const\ cl_event\ *" "event_wait_list" ", cl_event\ *" "event" ");"
.SH "PARAMETERS"
.PP
\fIcommand_queue\fR
.RS 4
A valid command\-queue\&.
.RE
.PP
\fInum_objects\fR
.RS 4
The number of memory objects to be released in
\fImem_objects\fR\&.
.RE
.PP
\fImem_objects\fR
.RS 4
A pointer to a list of OpenCL memory objects that were created from media surfaces\&.
.RE
.PP
\fInum_events_in_wait_list\fR, \fIevent_wait_list\fR
.RS 4
Specify events that need to complete before this particular command can be executed\&. If
\fIevent_wait_list\fR
is NULL, then this particular command does not wait on any event to complete\&. If
\fIevent_wait_list\fR
is NULL,
\fInum_events_in_wait_list\fR
must be 0\&. If
\fIevent_wait_list\fR
is not NULL, the list of events pointed to by
\fIevent_wait_list\fR
must be valid and
\fInum_events_in_wait_list\fR
must be greater than 0\&. The events specified in
\fIevent\fR
returns an event object that identifies this particular command and can be used to query or queue a wait for this particular command to complete\&.
\fIevent\fR
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
\fIevent_wait_list\fR
and the event arguments are not NULL, the
\fIevent\fR
argument should not refer to an element of the
\fIevent_wait_list\fR
array\&.
.RE
.SH "NOTES"
.PP
Used to release OpenCL memory objects that have been created from media surfaces\&. The media surfaces are released by the OpenCL context associated with
\fIcommand_queue\fR\&.
.PP
OpenCL memory objects created from media surfaces which have been acquired by OpenCL must be released by OpenCL before they may be accessed by the media adapter API\&. Accessing a media surface while its corresponding OpenCL memory object is acquired is in error and will result in undefined behavior, including but not limited to possible OpenCL errors, data corruption, and program termination\&.
.PP
If
\fBCL_CONTEXT_INTEROP_USER_SYNC\fR
is not specified as
\fBCL_TRUE\fR
during context creation,
\fBclEnqueueReleaseDX9MediaSurfacesKHR\fR
provides the synchronization guarantee that any calls to media adapter APIs involving the interop device(s) used in the OpenCL context made after the call to
\fBclEnqueueReleaseDX9MediaSurfacesKHR\fR
will not start executing until after all events in
\fIevent_wait_list\fR
are complete and all work already submitted to
\fIcommand_queue\fR
completes execution\&. If the context was created with properties specifying
\fBCL_CONTEXT_INTEROP_USER_SYNC\fR
as
\fBCL_TRUE\fR, the user is responsible for guaranteeing that any media adapter API calls involving the interop device(s) used in the OpenCL context made after
\fBclEnqueueReleaseDX9MediaSurfacesKHR\fR
will not start executing until after event returned by
\fBclEnqueueReleaseDX9MediaSurfacesKHR\fR
reports completion\&.
.PP
The goal of this extension is to allow applications to use media surfaces as OpenCL memory objects\&. This allows efficient sharing of data between OpenCL and selected adapter APIs (only DX9 for now)\&. If this extension is supported, an OpenCL image object can be created from a media surface and the OpenCL API can be used to execute kernels that read and/or write memory objects that are media surfaces\&. Note that OpenCL memory objects may be created from the adapter media surface if and only if the OpenCL context has been created from that adapter\&.
.PP
If this extension is supported by an implementation, the string "cl_khr_media_sharing" will be present in the
\fBCL_PLATFORM_EXTENSIONS\fR
or
\fBCL_DEVICE_EXTENSIONS\fR
string described in the table of allowed values for
\fIparam_name\fR
for
\fBclGetDeviceInfo\fR(3clc)\&.
.PP
As currently proposed the interfaces for this extension would be provided in
cl_dx9_media_sharing\&.h\&.
.PP
This section includes the D3D surface formats that are supported when the adapter type is one of the Direct 3D lineage \&. Using a D3D surface format not listed here is an error\&. To extend the use of this extension to support media adapters beyond DirectX9 tables similar to the ones in this section will need to be defined for the surface formats supported by the new media adapter\&. All implementations that support this extension are required to support the NV12 surface format, the other surface formats supported are the same surface formats that the adapter you are sharing with supports as long as they are listed in the two tables below\&.
.TS
allbox center tab(:);
cB cB.
T{
FOUR CC code
T}:T{
CL image format (channel order, channel data type)
T}
.T&
c c
c c
c c
c c
c c.
T{
FOURCC(\*(AqN\*(Aq, \*(AqV\*(Aq, \*(Aq1\*(Aq, \*(Aq2\*(Aq), Plane 0
T}:T{
\fBCL_R, CL_UNORM_INT8\fR
T}
T{
FOURCC(\*(AqN\*(Aq, \*(AqV\*(Aq, \*(Aq1\*(Aq, \*(Aq2\*(Aq), Plane 1
T}:T{
\fBCL_RG, CL_UNORM_INT8\fR
T}
T{
FOURCC(\*(AqY\*(Aq, \*(AqV\*(Aq, \*(Aq1\*(Aq, \*(Aq2\*(Aq), Plane 0
T}:T{
\fBCL_R, CL_UNORM_INT8\fR
T}
T{
FOURCC(\*(AqY\*(Aq, \*(AqV\*(Aq, \*(Aq1\*(Aq, \*(Aq2\*(Aq), Plane 1
T}:T{
\fBCL_R, CL_UNORM_INT8\fR
T}
T{
FOURCC(\*(AqY\*(Aq, \*(AqV\*(Aq, \*(Aq1\*(Aq, \*(Aq2\*(Aq), Plane 2
T}:T{
\fBCL_R, CL_UNORM_INT8\fR
T}
.TE
.sp 1
.PP
In the table above, NV12 Plane 0 corresponds to the luminance (Y) channel and Plane 1 corresponds to the UV channels\&. The YV12 Plane 0 corresponds to the Y channel, Plane 1 to the U channel and Plane 2 to the V channel\&. Note that the YUV formats map to
\fBCL_R\fR
and
\fBCL_RG\fR
but do not perform any YUV to RGB conversion and vice\-versa\&.
.TS
allbox center tab(:);
cB cB.
T{
D3D format
T}:T{
CL image format (channel order, channel data type)
T}
.T&
c c
c c
c c
c c
c c
c c
c c
c c
c c
c c
c c
c c
c c
c c
c c
c c.
T{
D3DFMT_R32F
T}:T{
\fBCL_R, CL_FLOAT\fR
T}
T{
D3DFMT_R16F
T}:T{
\fBCL_R, CL_HALF_FLOAT\fR
T}
T{
D3DFMT_L16
T}:T{
\fBCL_R, CL_UNORM_INT16\fR
T}
T{
D3DFMT_A8
T}:T{
\fBCL_A, CL_UNORM_INT8\fR
T}
T{
D3DFMT_L8
T}:T{
\fBCL_R, CL_UNORM_INT8\fR
T}
T{
D3DFMT_G32R32F
T}:T{
\fBCL_RG, CL_FLOAT\fR
T}
T{
D3DFMT_G16R16F
T}:T{
\fBCL_RG, CL_HALF_FLOAT\fR
T}
T{
D3DFMT_G16R16
T}:T{
\fBCL_RG, CL_UNORM_INT16\fR
T}
T{
D3DFMT_A8L8
T}:T{
\fBCL_RG, CL_UNORM_INT8\fR
T}
T{
D3DFMT_A32B32G32R32F
T}:T{
\fBCL_RGBA, CL_FLOAT\fR
T}
T{
D3DFMT_A16B16G16R16F
T}:T{
\fBCL_RGBA, CL_HALF_FLOAT\fR
T}
T{
D3DFMT_A16B16G16R16
T}:T{
\fBCL_RGBA, CL_UNORM_INT16\fR
T}
T{
D3DFMT_A8B8G8R8
T}:T{
\fBCL_RGBA, CL_UNORM_INT8\fR
T}
T{
D3DFMT_X8B8G8R8
T}:T{
\fBCL_RGBA, CL_UNORM_INT8\fR
T}
T{
D3DFMT_A8R8G8B8
T}:T{
\fBCL_BGRA, CL_UNORM_INT8\fR
T}
T{
D3DFMT_X8R8G8B8
T}:T{
\fBCL_BGRA, CL_UNORM_INT8\fR
T}
.TE
.sp 1
.PP
Note that D3D9 format names seem to imply that the order of the color channels are switched relative to OpenCL but this is not the case\&. For example, layout of channels for each pixel for D3DFMT_A32FB32FG32FR32F is the same as
\fBCL_RGBA\fR,
\fBCL_FLOAT\fR\&.
.PP
Properties of media surface objects may be queried using
\fBclGetMemObjectInfo\fR(3clc)
and
\fBclGetImageInfo\fR(3clc)
with
\fIparam_name\fR
\fBCL_MEM_MEDIA_ADAPTER_TYPE_KHR\fR,
\fBCL_MEM_MEDIA_SURFACE_INFO_KHR\fR
and
\fBCL_IMAGE_MEDIA_SURFACE_PLANE_KHR\fR
as described for
\fBclGetImageInfo\fR(3clc)
and in the information below about accessing mapped regions of a memory object\&.
Accessing mapped regions of a memory object.PP
This section describes the behavior of OpenCL commands that access mapped regions of a memory object\&.
.PP
The contents of the region of a memory object and associated memory objects (sub\-buffer objects or 1D image buffer objects that overlap this region) mapped for writing (i\&.e\&.
\fBCL_MAP_WRITE\fR
or
\fBCL_MAP_WRITE_INVALIDATE_REGION\fR
is set in
\fImap_flags\fR
argument to
\fBclEnqueueMapBuffer\fR(3clc)
or
\fBclEnqueueMapImage\fR(3clc)) are considered to be undefined until this region is unmapped\&.
.PP
Multiple commands in command\-queues can map a region or overlapping regions of a memory object and associated memory objects (sub\-buffer objects or 1D image buffer objects that overlap this region) for reading (i\&.e\&.
\fImap_flags\fR
=
\fBCL_MAP_READ\fR)\&. The contents of the regions of a memory object mapped for reading can also be read by kernels and other OpenCL commands (such as
\fBclEnqueueCopyBuffer\fR(3clc)) executing on a device(s)\&.
.PP
Mapping (and unmapping) overlapped regions in a memory object and/or associated memory objects (sub\-buffer objects or 1D image buffer objects that overlap this region) for writing is an error and will result in
\fBCL_INVALID_OPERATION\fR
error returned by
\fBclEnqueueMapBuffer\fR(3clc)
or
\fBclEnqueueMapImage\fR(3clc)\&.
.PP
If a memory object is currently mapped for writing, the application must ensure that the memory object is unmapped before any enqueued kernels or commands that read from or write to this memory object or any of its associated memory objects (sub\-buffer or 1D image buffer objects) or its parent object (if the memory object is a sub\-buffer or 1D image buffer object) begin execution; otherwise the behavior is undefined\&.
.PP
If a memory object is currently mapped for reading, the application must ensure that the memory object is unmapped before any enqueued kernels or commands that write to this memory object or any of its associated memory objects (sub\-buffer or 1D image buffer objects) or its parent object (if the memory object is a sub\-buffer or 1D image buffer object) begin execution; otherwise the behavior is undefined\&.
.PP
Accessing the contents of the memory region referred to by the mapped pointer that has been unmapped is undefined\&.
.PP
The mapped pointer returned by
\fBclEnqueueMapBuffer\fR(3clc)
or
\fBclEnqueueMapImage\fR(3clc)
can be used as
\fIptr\fR
argument value to
\fBclEnqueueReadBuffer\fR(3clc),
\fBclEnqueueWriteBuffer\fR(3clc),
\fBclEnqueueReadBufferRect\fR(3clc),
\fBclEnqueueWriteBufferRect\fR(3clc),
\fBclEnqueueReadImage\fR(3clc), and
\fBclEnqueueWriteImage\fR(3clc), provided the rules described above are adhered to\&.
.SH "ERRORS"
.PP
Returns
CL_SUCCESS
returns
CL_SUCCESS
if the function is executed successfully\&. If
\fInum_objects\fR
is 0 and <\fImem_objects\fR> is NULL then the function does nothing and returns
CL_SUCCESS\&. Otherwise it returns one of the following errors:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_VALUE if \fInum_objects\fR is zero and
\fImem_objects\fR is not a NULL value or if \fInum_objects\fR
> 0 and \fImem_objects\fR is NULL\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_MEM_OBJECT if memory objects in \fImem_objects\fR
are not valid OpenCL memory objects or if memory objects in \fImem_objects\fR have
not been created from media surfaces\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_COMMAND_QUEUE if \fIcommand_queue\fR is not
a valid command\-queue\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_CONTEXT if context associated with
\fIcommand_queue\fR was not created from a media object\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_DX9_MEDIA_SURFACE_NOT_ACQUIRED_KHR if memory objects in
\fImem_objects\fR have not been previously been acquired using
\fBclEnqueueAcquireDX9MediaSurfacesKHR\fR or have been released using
\fBclEnqueueReleaseDX9MediaSurfacesKHR\fR(3clc)
since the last time that they were acquired\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_EVENT_WAIT_LIST if \fIevent_wait_list\fR is
NULL and \fInum_event_in_wait_list\fR > 0, or \fIevent_wait_list\fR
is  not NULL and \fInum_event_in_wait_list\fR is 0, or if event objects in
\fIevent_wait_list\fR are not valid events\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_OUT_OF_HOST_MEMORY if there is a failure to allocate
resources required by the OpenCL implementation on the host\&.
.RE
.SH "SPECIFICATION"
.PP
\m[blue]\fBOpenCL Specification\fR\m[]\&\s-2\u[1]\d\s+2
.SH "SEE ALSO"
.PP
\fBcl_khr_dx9_media_sharing\fR(3clc),
\fBclGetDeviceIDsFromDX9MediaAdapterKHR\fR(3clc),
\fBclCreateFromDX9MediaSurfaceKHR\fR(3clc),
\fBclEnqueueAcquireDX9MediaSurfacesKHR\fR(3clc),
\fBclEnqueueReleaseDX9MediaSurfacesKHR\fR(3clc)
.SH "AUTHORS"
.PP
\fBThe Khronos Group\fR
.SH "COPYRIGHT"
.br
Copyright \(co 2007-2011 The Khronos Group Inc.
.br
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.
.sp
.SH "NOTES"
.IP " 1." 4
OpenCL Specification
.RS 4
\%page 93, section 9.10.7.4 - Sharing Memory Objects...
.RE