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clEnqueueReleaseGLObjects.adoc

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clEnqueueReleaseGLObjects.adoc

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clEnqueueReleaseGLObjects

Release OpenCL memory objects that have been created from OpenGL objects.

cl_int clEnqueueReleaseGLObjects(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

command_queue

A valid command-queue.

num_objects

The number of memory objects to be released in mem_objects.

mem_objects

A pointer to a list of CL memory objects that correspond to GL objects.

event_wait_list num_events_in_wait_list

These parameters specify events that need to complete before this 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_wait_list act as synchronization points.

event

Returns an event object that identifies this particular read/write command and can be used to query or queue a wait for the 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.

If the cl_khr_gl_event extension is supported, if an OpenGL context is bound to the current thread, then then any OpenGL commands which

  • affect or access the contents of the memory objects listed in the mem_objects list, and

  • are issued on that context after the call to clEnqueueReleaseGLObjects

will not execute until after execution of any OpenCL commands preceding the clEnqueueReleaseGLObjects which affect or access any of those memory objects. If a non-NULL event object is returned, it will report completion before execution of such OpenGL commands.

Description

Release OpenCL memory objects that have been created from OpenGL objects. These objects need to be released before they can be used by OpenGL. The OpenGL objects are released by the OpenCL context associated with command_queue.

Notes

If the cl_khr_gl_sharing extension is supported and if an OpenGL context is bound to the current thread, then any OpenGL commands which does:

  • affect or access the contents of a memory object listed in the mem_objects list, and

  • are issued on that context after the call to clEnqueueReleaseGLObjects

will not execute until after execution of any OpenCL commands preceding the clEnqueueReleaseGLObjects which affect or access any of those memory objects. If a non-NULL event object is returned, it will report completion before execution of such OpenGL commands.

Errors

clEnqueueReleaseGLObjects returns CL_SUCCESS if the function is executed successfully. If num_objects is 0 and mem_objects is NULL 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.

  • 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 OpenGL context.

  • CL_INVALID_GL_OBJECT if memory objects in mem_objects have not been created from a GL object(s).

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

  • 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.