Ubuntu Manpage: clEnqueueReleaseD3D10ObjectsKHR - Release OpenCL memory objects that have been created

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NAME

       clEnqueueReleaseD3D10ObjectsKHR - Release OpenCL memory objects that have been created
       from Direct3D 10 resources.

       cl_int clEnqueueReleaseD3D10ObjectsKHR(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);

PARAMETERS

       num_objects
           The number of memory objects to be released in mem_objects.

       mem_objects
           A pointer to a list of OpenCL memory objects that were created from Direct3D 10
           resources.

       num_events_in_wait_list, event_wait_list
           Specify events that need to complete before this particular command can be executed.
           If event_wait_list is NULL, then this particular command does not wait on any event to
           complete. If event_wait_list is NULL, num_events_in_wait_list must be 0. If
           event_wait_list is not NULL, the list of events pointed to by event_wait_list must be
           valid and num_events_in_wait_list must be greater than 0. The events specified in
           event 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.  event 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 event_wait_list and the
           event arguments are not NULL, the event argument should not refer to an element of the
           event_wait_list array.

NOTES

The Direct3D 10 objects are released by the OpenCL context associated with command_queue.

OpenCL memory objects created from Direct3D 10 resources which have been acquired by
OpenCL must be released by OpenCL before they may be accessed by Direct3D 10. Accessing a
Direct3D 10 resource 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.

If CL_CONTEXT_INTEROP_USER_SYNC is not specified as CL_TRUE during context creation,
clEnqueueReleaseD3D10ObjectsKHR provides the synchronization guarantee that any calls to
Direct3D 10 calls involving the interop device(s) used in the OpenCL context made after
the call to clEnqueueReleaseD3D10ObjectsKHR will not start executing until after all
events in event_wait_list are complete and all work already submitted to command_queue
completes execution. 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 after
clEnqueueReleaseD3D10ObjectsKHR will not start executing until after event returned by
clEnqueueReleaseD3D10ObjectsKHR reports completion.

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.

ERRORS

       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_INVALID_VALUE if num_objects is zero and mem_objects is not a NULL value or if
           num_objects > 0 and mem_objects is NULL.

       •   CL_INVALID_MEM_OBJECT if memory objects in mem_objects are not valid OpenCL memory
           objects or if memory objects in mem_objects have not been created from Direct3D 10
           resources.

       •   CL_INVALID_COMMAND_QUEUE if command_queue is not a valid command-queue.

       •   CL_INVALID_CONTEXT if context associated with command_queue was not created from an
           Direct3D 10 context.

       •   CL_D3D10_RESOURCE_NOT_ACQUIRED_KHR if memory objects in mem_objects have not
           previously been acquired using clEnqueueAcquireD3D10ObjectsKHR, or have been released
           using clEnqueueReleaseD3D10ObjectsKHR since the last time that they were acquired.

       •   CL_INVALID_EVENT_WAIT_LIST if event_wait_list is NULL and num_event_in_wait_list > 0,
           or event_wait_list is  not NULL and num_event_in_wait_list is 0, or if event objects
           in event_wait_list are not valid events.

       •   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]

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 79, section 9.9.7.6 - Sharing memory objects created from...

NAME

PARAMETERS

NOTES

ERRORS

SPECIFICATION

SEE ALSO

AUTHORS

COPYRIGHT

NOTES