clEnqueueCopyBuffer

Enqueues a command to copy a rectangular region from the buffer object to another buffer object.

cl_int clEnqueueCopyBufferRect ( cl_command_queue command_queue,
  cl_mem src_buffer,
  cl_mem dst_buffer,
  const size_t src_origin[3],
  const size_t dst_origin[3],
  const size_t region[3],
  size_t src_row_pitch,
  size_t src_slice_pitch,
  size_t dst_row_pitch,
  size_t dst_slice_pitch,
  cl_uint num_events_in_wait_list,
  const cl_event *event_wait_list,
  cl_event *event)

Parameters

command_queue

The command-queue in which the copy command will be queued. The OpenCL context associated with command_queue, src_buffer, and dst_buffer must be the same.

src_origin

The (x, y, z) offset in the memory region associated with src_buffer. For a 2D rectangle region, the z value given by src_origin[2] should be 0. The offset in bytes is computed as src_origin[2] * src_slice_pitch + src_origin[1] * src_row_pitch + src_origin[0].

dst_origin

The (x, y, z) offset in the memory region associated with dst_buffer. For a 2D rectangle region, the z value given by dst_origin[2] should be 0. The offset in bytes is computed as dst_origin[2] * dst_slice_pitch + dst_origin[1] * dst_row_pitch + dst_origin[0].

region

The (width, height, depth) in bytes of the 2D or 3D rectangle being copied. For a 2D rectangle, the depth value given by region[2] should be 1.

src_row_pitch

The length of each row in bytes to be used for the memory region associated with src_buffer. If src_row_pitch is 0, src_row_pitch is computed as region[0].

src_slice_pitch

The length of each 2D slice in bytes to be used for the memory region associated with src_buffer. If src_slice_pitch is 0, src_slice_pitch is computed as region[1] * src_row_pitch.

dst_row_pitch

The length of each row in bytes to be used for the memory region associated with dst_buffer. If dst_row_pitch is 0, dst_row_pitch is computed as region[0].

dst_slice_pitch

The length of each 2D slice in bytes to be used for the memory region associated with dst_buffer. If dst_slice_pitch is 0, dst_slice_pitch is computed as region[1] * dst_row_pitch.

event_wait_list, , num_events_in_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_wait_list act as synchronization points. The context associated with events in event_wait_list and command_queue must be the same.

event

Returns an event object that identifies this particular copy 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. clEnqueueBarrier can be used instead.

Errors

Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of the following errors:

  • CL_INVALID_COMMAND_QUEUE if command_queue is not a valid command-queue.
  • CL_INVALID_CONTEXT if the context associated with command_queue, src_buffer, and dst_buffer are not the same or if the context associated with command_queue and events in event_wait_list are not the same.
  • CL_INVALID_MEM_OBJECT if src_buffer and dst_buffer are not valid buffer objects.
  • CL_INVALID_VALUE if (src_offset, region) or (dst_offset, region) require accessing elements outside the src_buffer and dst_buffer objects respectively.
  • CL_INVALID_EVENT_WAIT_LIST if event_wait_list is NULL and num_events_in_wait_list is greater than 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_MEM_COPY_OVERLAP if src_buffer and dst_buffer are the same buffer object and the source and destination regions overlap.
  • CL_MISALIGNED_SUB_BUFFER_OFFSET if src_buffer is a sub-buffer object and offset specified when the sub-buffer object is created is not aligned to CL_DEVICE_MEM_BASE_ADDR_ALIGN value for device associated with queue.
  • CL_MISALIGNED_SUB_BUFFER_OFFSET if dst_buffer is a sub-buffer object and offset specified when the sub-buffer object is created is not aligned to CL_DEVICE_MEM_BASE_ADDR_ALIGN value for device associated with queue.
  • CL_MEM_OBJECT_ALLOCATION_FAILURE if there is a failure to allocate memory for data store associated with src_buffer or dst_buffer.
  • 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.

Specification

OpenCL Specification

Also see

clEnqueueReadBuffer, clEnqueueReadBufferRect, clEnqueueWriteBuffer, clEnqueueWriteBufferRect, clEnqueueCopyBuffer, clCreateBuffer, clCreateSubBuffer, clEnqueueCopyBufferToImage, clEnqueueCopyImageToBuffer

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