clGetDeviceIDsFromD3D10KHR

Querying OpenCL Devices Corresponding to Direct3D 10 Devices.

cl_int clGetDeviceIDsFromD3D10KHR ( cl_platform_id platform,
  cl_d3d10_device_source_khr d3d_device_source,
  void *d3d_object,
  cl_d3d10_device_set_khr d3d_device_set,
  cl_uint num_entries,
  cl_device_id *devices,
  cl_uint *num_devices)

Parameters

platform

Refers to the platform ID returned by clGetPlatformIDs.

d3d_device_source

Specifies the type of d3d_object and may be one of the following:.

cl_d3d_device_source_khr Type of d3d_object
CL_D3D10_DEVICE_KHR ID3D10Device *
CL_D3D10_DXGI_ADAPTER_KHR IDXGIAdapter *
d3d_object

Specifies the object whose corresponding OpenCL devices are being queried. The type of d3d_object must be as specified in the table above.

d3d_device_set

Specifies the set of devices to return, and must be one of the following:

cl_d3d_device_set_khr Devices returned in devices
CL_PREFERRED_DEVICES_FOR_D3D10_KHR The OpenCL devices associated with the specified Direct3D object.
CL_ALL_DEVICES_FOR_D3D10_KHR All OpenCL devices which may interoperate with the specified Direct3D object. Performance of sharing data on these devices may be considerably less than on the preferred devices.
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. The cl_device_id values returned in devices can be used to identify a specific OpenCL device. If devices is NULL, this argument is ignored. The number of OpenCL devices returned is the mininum of the value specified by num_entries and the number of OpenCL devices corresponding to d3d_object.

num_devices

Returns the number of OpenCL devices available that correspond to d3d_object. If num_devices is NULL, this argument is ignored.

Description

The OpenCL devices corresponding to a Direct3D 10 device may be queried. The OpenCL devices corresponding to a DXGI adapter may also be queried. The OpenCL devices corresponding to a Direct3D 10 device will be a subset of the OpenCL devices corresponding to the DXGI adapter against which the Direct3D 10 device was created.

Notes

General information about sharing memory objects with Direct3D 10 follows.

The goal of this extension is to provide interoperability between OpenCL and Direct3D 10. This is designed to function analogously to the OpenGL interoperability. If this extension is supported by an implementation, the string "cl_khr_d3d10_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.

As currently proposed, the interfaces for this extension would be provided in cl_d3d10.h.

This section discusses OpenCL functions that allow applications to use Direct3D 10 resources as OpenCL memory objects. This allows efficient sharing of data between OpenCL and Direct3D 10. The OpenCL API may be used to execute kernels that read and/or write memory objects that are also Direct3D 10 resources. An OpenCL image object may be created from a Direct3D 10 texture resource. An OpenCL buffer object may be created from a Direct3D 10 buffer resource. OpenCL memory objects may be created from Direct3D 10 objects if and only if the OpenCL context has been created from a Direct3D 10 device.

Lifetime of Shared Objects

An OpenCL memory object created from a Direct3D 10 resource remains valid as long as the corresponding Direct3D 10 resource has not been deleted. If the Direct3D 10 resource is deleted through the Direct3D 10 API, subsequent use of the OpenCL memory object will result in undefined behavior, including but not limited to possible OpenCL errors, data corruption, and program termination.

The successful creation of a cl_context against a Direct3D 10 device specified via the context create parameter CL_CONTEXT_D3D10_DEVICE_KHR will increment the internal Direct3D reference count on the specified Direct3D 10 device. The internal Direct3D reference count on that Direct3D 10 device will be decremented when the OpenCL reference count on the returned OpenCL context drops to zero.

The OpenCL context and corresponding command-queues are dependent on the existence of the Direct3D 10 device from which the OpenCL context was created. If the Direct3D 10 device is deleted through the Direct3D 10 API, subsequent use of the OpenCL context will result in undefined behavior, including but not limited to possible OpenCL errors, data corruption, and program termination.

Errors

Returns CL_SUCCESS if the function is executed successfully. Otherwise it may return:

  • CL_INVALID_PLATFORM if platform is not a valid platform.
  • CL_INVALID_VALUE if d3d_device_source is not a valid value, d3d_device_set is not a valid value, 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 d3d_object were found.

Specification

OpenCL Specification

Also see

cl_khr_d3d10_sharing, clCreateFromD3D10BufferKHR, clCreateFromD3D10Texture2DKHR, clCreateFromD3D10Texture3DKHR, clEnqueueAcquireD3D10ObjectsKHR, clEnqueueReleaseD3D10ObjectsKHR

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