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clCreateFromDX9MediaSurfaceKHR.adoc

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clCreateFromDX9MediaSurfaceKHR

Creates an OpenCL image object from a media surface.

cl_mem clCreateFromDX9MediaSurfaceKHR(cl_context context,
                                      cl_mem_flags flags,
                                      cl_dx9_media_adapter_type_khr adapter_type,
                                      void *surface_info,
                                      cl_uint plane,
                                      cl_int *errcode_ret)

Parameters

context

A valid OpenCL context created from a media adapter.

flags

A bit-field that is used to specify usage information. Refer to the table of allowed values for flags for clCreateBuffer. Only CL_MEM_READ_ONLY, CL_MEM_WRITE_ONLY, and CL_MEM_READ_WRITE values specified in the table of allowed values for flags for clCreateBuffer can be used.

adapter_type

A value from enumeration of supported adapters described in the table of cl_dx9_media_adapter_type_khr values for clGetDeviceIDsFromDX9MediaAdapterKHR. The type of surface_info is determined by the adapter type. The implementation does not need to support all adapter types. This approach provides flexibility to support additional adapter types in the future. Supported adapter types are CL_ADAPTER_D3D9_KHR, CL_ADAPTER_D3D9EX_KHR, and CL_ADAPTER_DXVA_KHR.

If adapter_type is CL_ADAPTER_D3D9_KHR, CL_ADAPTER_D3D9EX_KHR, or CL_ADAPTER_DXVA_KHR, the surface_info points to the following structure:

typedef struct _cl_dx9_surface_info_khr { IDirect3DSurface9 *resource; HANDLE shared_handle; } cl_dx9_surface_info_khr;

For D3D9 surfaces, we need both the handle to the resource and the resource itself to have a sufficient amount of information to eliminate a copy of the surface for sharing in cases where this is possible. Elimination of the copy is driver dependent. shared_handle may be NULL and this may result in sub-optimal performance.

surface_info

A pointer to one of the structures defined in the adapter_type description above passed in as a void *.

plane

The plane of resource to share for planar surface formats. For planar formats, we use the plane parameter to obtain a handle to thie specific plane (Y, U or V for example). For nonplanar formats used by media, plane must be 0.

errcode_ret

An appropriate error code. If errcode_ret is NULL, no error code is returned.

Notes

The width and height of the returned OpenCL 2D image object are determined by the width and height of the plane of resource. The channel type and order of the returned image object is determined by the format and plane of resource and are described in tables 9.10.3 and 9.10.4.

This call will increment the internal media surface count on resource. The internal media surface reference count on resource will be decremented when the OpenCL reference count on the returned OpenCL memory object drops to zero.

Errors

Returns a valid non-zero 2D image object and errcode_ret is set to CL_SUCCESS if the 2D image object is created successfully. Otherwise, it returns a NULL value with one of the following error values returned in errcode_ret:

  • CL_INVALID_CONTEXT if context is not a valid context.

  • CL_INVALID_VALUE if values specified in flags are not valid or if plane is not a valid plane of resource specified in surface_info.

  • CL_INVALID_DX9_MEDIA_SURFACE_KHR if resource specified in surface_info is not a valid resource or is not associated with adapter_type (e.g., adapter_type is set to CL_ADAPTER_D3D9_KHR and resource is not a Direct3D 9 surface created in D3DPOOL_DEFAULT).

  • CL_INVALID_DX9_MEDIA_SURFACE_KHR if shared_handle specified in surface_info is not NULL or a valid handle value.

  • CL_INVALID_DX9_MEDIA_SURFACE_KHR if adapter_type is set to a media adapter and the surface_info does not reference a media surface of the required type, or if adapter_type is set to a media adapter type and surface_info does not contain a valid reference to a media surface on that adapter, by clGetMemObjectInfo when param_name is a surface or handle when the image was not created from an appropriate media surface, and from clGetImageInfo when param_name is CL_IMAGE_DX9_MEDIA_PLANE_KHR and image was not created from an appropriate media surface.

  • CL_INVALID_IMAGE_FORMAT_DESCRIPTOR if the texture format of resource is not listed in tables 9.10.3 and 9.10.4.

  • CL_INVALID_OPERATION if there are no devices in context that support adapter_type.

  • 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.