Provided by: opencl-1.2-man-doc_1.0~svn33624-5_all 
NAME
clGetDeviceIDsFromDX9MediaAdapterKHR - Query a media adapter for any associated OpenCL
devices.
cl_int clGetDeviceIDsFromDX9MediaAdapterKHR(cl_platform_id platform,
cl_uint num_media_adapters,
cl_dx9_media_adapter_type_khr *media_adapters_type,
void *media_adapters,
cl_dx9_media_adapter_set_khr media_adapter_set,
cl_uint num_entries, cl_device_id *devices,
cl_int *num_devices);
PARAMETERS
platform
Refers to the platform ID returned by clGetPlatformIDs(3clc).
num_media_adapters
The number of media adapters.
media_adapters_type
An array of num_media_adapters entries. Each entry specifies the type of media adapter
and must be one of the values described in the table below.
┌──────────────────────────────┬────────────────────────┐
│cl_dx9_media_adapter_type_khr │ Type of media adapters │
├──────────────────────────────┼────────────────────────┤
│CL_ADAPTER_D3D9_KHR │ IDirect3DDevice9 * │
├──────────────────────────────┼────────────────────────┤
│CL_ADAPTER_D3D9EX_KHR │ IDirect3DDevice9Ex * │
├──────────────────────────────┼────────────────────────┤
│CL_ADAPTER_DXVA_KHR │ IDXVAHD_Device * │
└──────────────────────────────┴────────────────────────┘
media_adapters
An array of num_media_adapters entries. Each entry specifies the actual adapter whose
type is specified by media_adapter_type. The media_adapters must be one of the types
describes in the table above.
media_adapter_set
Specifies the set of adapters to return and must be one of the values described in the
table below.
┌───────────────────────────────────────────┬──────────────────────────────┐
│cl_dx9_media_adapter_set_khr │ Description │
├───────────────────────────────────────────┼──────────────────────────────┤
│CL_PREFERRED_DEVICES_FOR_MEDIA_ADAPTER_KHR │ The preferred OpenCL devices │
│ │ associated with the media │
│ │ adapter. │
├───────────────────────────────────────────┼──────────────────────────────┤
│CL_ALL_DEVICES_FOR_MEDIA_ADAPTER_KHR │ All OpenCL devices that may │
│ │ interoperate with the media │
│ │ adapter. │
└───────────────────────────────────────────┴──────────────────────────────┘
num_entries
The number of cl_device_id entries that can be added to devices. If devices is not
NULL, the num_entries must be greater than zero.
devices
Returns a list of OpenCL devices found that support the list of media adapters
specified. The cl_device_id values returned in devices can be used to identify a
specific OpenCL device. If devices argument is NULL, this argument is ignored. The
number of OpenCL devices returned is the minimum of the value specified by num_entries
or the number of OpenCL devices whose type matches device_type.
num_devices
Returns the number of OpenCL devices. If num_devices is NULL, this argument is
ignored.
DESCRIPTION
Queries a media adapter for any associated OpenCL devices. Adapters with associated OpenCL
devices can enable media surface sharing between the two.
NOTES
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.
If this extension is supported by an implementation, the string "cl_khr_media_sharing"
will be present in the CL_PLATFORM_EXTENSIONS or CL_DEVICE_EXTENSIONS string described in
the table of allowed values for param_name for clGetDeviceInfo(3clc).
As currently proposed the interfaces for this extension would be provided in
cl_dx9_media_sharing.h.
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.
┌────────────────────────────┬─────────────────────────────────┐
│ FOUR CC code │ CL image format (channel order, │
│ │ channel data type) │
├────────────────────────────┼─────────────────────────────────┤
│FOURCC('N', 'V', '1', '2'), │ CL_R, CL_UNORM_INT8 │
│Plane 0 │ │
├────────────────────────────┼─────────────────────────────────┤
│FOURCC('N', 'V', '1', '2'), │ CL_RG, CL_UNORM_INT8 │
│Plane 1 │ │
├────────────────────────────┼─────────────────────────────────┤
│FOURCC('Y', 'V', '1', '2'), │ CL_R, CL_UNORM_INT8 │
│Plane 0 │ │
├────────────────────────────┼─────────────────────────────────┤
│FOURCC('Y', 'V', '1', '2'), │ CL_R, CL_UNORM_INT8 │
│Plane 1 │ │
├────────────────────────────┼─────────────────────────────────┤
│FOURCC('Y', 'V', '1', '2'), │ CL_R, CL_UNORM_INT8 │
│Plane 2 │ │
└────────────────────────────┴─────────────────────────────────┘
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 CL_R and
CL_RG but do not perform any YUV to RGB conversion and vice-versa.
┌─────────────────────┬─────────────────────────────────┐
│ D3D format │ CL image format (channel order, │
│ │ channel data type) │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_R32F │ CL_R, CL_FLOAT │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_R16F │ CL_R, CL_HALF_FLOAT │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_L16 │ CL_R, CL_UNORM_INT16 │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_A8 │ CL_A, CL_UNORM_INT8 │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_L8 │ CL_R, CL_UNORM_INT8 │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_G32R32F │ CL_RG, CL_FLOAT │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_G16R16F │ CL_RG, CL_HALF_FLOAT │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_G16R16 │ CL_RG, CL_UNORM_INT16 │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_A8L8 │ CL_RG, CL_UNORM_INT8 │
├─────────────────────┼─────────────────────────────────┤
│D3DFMT_A32B32G32R32F │ CL_RGBA, CL_FLOAT │
├─────────────────────┼─────────────────────────────────┤
│D3DFMT_A16B16G16R16F │ CL_RGBA, CL_HALF_FLOAT │
├─────────────────────┼─────────────────────────────────┤
│D3DFMT_A16B16G16R16 │ CL_RGBA, CL_UNORM_INT16 │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_A8B8G8R8 │ CL_RGBA, CL_UNORM_INT8 │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_X8B8G8R8 │ CL_RGBA, CL_UNORM_INT8 │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_A8R8G8B8 │ CL_BGRA, CL_UNORM_INT8 │
├─────────────────────┼─────────────────────────────────┤
│ D3DFMT_X8R8G8B8 │ CL_BGRA, CL_UNORM_INT8 │
└─────────────────────┴─────────────────────────────────┘
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 CL_RGBA, CL_FLOAT.
Properties of media surface objects may be queried using clGetMemObjectInfo(3clc) and
clGetImageInfo(3clc) with param_name CL_MEM_MEDIA_ADAPTER_TYPE_KHR,
CL_MEM_MEDIA_SURFACE_INFO_KHR and CL_IMAGE_MEDIA_SURFACE_PLANE_KHR as described for
clGetImageInfo(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.
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.
CL_MAP_WRITE or CL_MAP_WRITE_INVALIDATE_REGION is set in map_flags argument to
clEnqueueMapBuffer(3clc) or clEnqueueMapImage(3clc)) are considered to be undefined until
this region is unmapped.
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. map_flags = CL_MAP_READ). The contents of the
regions of a memory object mapped for reading can also be read by kernels and other OpenCL
commands (such as clEnqueueCopyBuffer(3clc)) executing on a device(s).
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 CL_INVALID_OPERATION error returned by
clEnqueueMapBuffer(3clc) or clEnqueueMapImage(3clc).
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.
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.
Accessing the contents of the memory region referred to by the mapped pointer that has
been unmapped is undefined.
The mapped pointer returned by clEnqueueMapBuffer(3clc) or clEnqueueMapImage(3clc) can be
used as ptr argument value to clEnqueueReadBuffer(3clc), clEnqueueWriteBuffer(3clc),
clEnqueueReadBufferRect(3clc), clEnqueueWriteBufferRect(3clc), clEnqueueReadImage(3clc),
and clEnqueueWriteImage(3clc), provided the rules described above are adhered to.
ERRORS
Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of
the following errors:
• CL_INVALID_PLATFORM if platform is not a valid platform.
• CL_INVALID_VALUE if num_media_adapters is zero or if media_adapters_type is NULL or if
media_adapters is NULL.
• CL_INVALID_VALUE if any of the entries in media_adapters_type or media_adapters is not
a valid value.
• CL_INVALID_VALUE if media_adapter_set is not a valid value.
• CL_INVALID_VALUE if num_entries is equal to zero and devices is not NULL or if both
num_devices and devices are NULL.
• CL_DEVICE_NOT_FOUND if no OpenCL devices that correspond to adapters specified in
media_adapters and media_adapters_type were found.
• CL_OUT_OF_RESOURCES if there is a failure to allocate resources required by the OpenCL
implementation on the device.
• CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the
OpenCL implementation on the host.
SPECIFICATION
OpenCL Specification[1]
SEE ALSO
cl_khr_dx9_media_sharing(3clc), clGetDeviceIDsFromDX9MediaAdapterKHR(3clc),
clCreateFromDX9MediaSurfaceKHR(3clc), clEnqueueAcquireDX9MediaSurfacesKHR(3clc),
clEnqueueReleaseDX9MediaSurfacesKHR(3clc),
AUTHORS
The Khronos Group
COPYRIGHT
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.
NOTES
1. OpenCL Specification
page 88, section 9.10.7.1 - Querying OpenCL Devices corresponding....