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

cl_int clEnqueueAcquireGLObjects ( 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)



A valid command-queue. All devices used to create the OpenCL context associated with command_queue must support acquiring shared CL/GL objects. This constraint is enforced at context creation time.


The number of memory objects to be acquired in mem_objects.


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

event_wait_list , num_events_in_wait_list

Specifies 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_wait_list act as synchronization points.


Returns an event object that identifies this 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.


These objects need to be acquired before they can be used by any OpenCL commands queued to a command-queue. The OpenGL 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.


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_HOST_MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.


OpenCL Specification

Also see


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