clEnqueueAcquireD3D10ObjectsKHR - Acquire OpenCL memory objects that have been created from Direct3D 10 resources
cl_int clEnqueueAcquireD3D10ObjectsKHR(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);
The Direct3D 10 objects are acquired by the OpenCL context associated with command-queue and can therefore be used by all command-queues associated with the OpenCL context.
OpenCL memory objects created from Direct3D 10 resources 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 Direct3D 10 resource is used while it is not currently acquired by OpenCL, the call attempting to use that OpenCL memory object will return CL_D3D10_RESOURCE_NOT_ACQUIRED_KHR.
If CL_CONTEXT_INTEROP_USER_SYNC is not specified as CL_TRUE during context creation, clEnqueueAcquireD3D10ObjectsKHR provides the synchronization guarantee that any Direct3D 10 calls involving the interop device(s) used in the OpenCL context made before clEnqueueAcquireD3D10ObjectsKHR is called will complete executing before event reports completion and before the execution of any subsequent OpenCL work issued in command_queue begins. If the context was created with properties specifying CL_CONTEXT_INTEROP_USER_SYNC as CL_TRUE, the user is responsible for guaranteeing that any Direct3D 10 calls involving the interop device(s) used in the OpenCL context made before clEnqueueAcquireD3D10ObjectsKHR is called have completed before calling clEnqueueAcquireD3D10ObjectsKHR.
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(3clc).
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.PP 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.
Returns CL_SUCCESS returns CL_SUCCESS if the function is executed successfully. If num_objects is 0 and mem_objects is NULL then the function does nothing and returns CL_SUCCESS. Otherwise it returns one of the following errors:
cl_khr_d3d10_sharing(3clc), clGetDeviceIDsFromD3D10KHR(3clc), clCreateFromD3D10BufferKHR(3clc), clCreateFromD3D10Texture2DKHR(3clc), clCreateFromD3D10Texture3DKHR(3clc), clEnqueueReleaseD3D10ObjectsKHR(3clc)
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