NAME¶
clEnqueueCopyBuffer - Enqueues a command to copy from one buffer
object to another.
cl_int
clEnqueueCopyBuffer(cl_command_queue command_queue,
cl_mem src_buffer,
cl_mem dst_buffer,
size_t src_offset,
size_t dst_offset, size_t size,
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_offset
The offset where to begin copying data from
src_buffer.
dst_offset
The offset where to begin copying data into
dst_buffer.
size
Refers to the size in bytes to copy.
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. The memory
associated with event_wait_list can be reused or freed after the
function returns.
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. clEnqueueBarrierWithWaitList(3clc)
can be used instead. 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.
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,
dst_offset, size, src_offset + size, or
dst_offset + size require accessing elements outside the
src_buffer and dst_buffer buffer objects respectively.
•CL_INVALID_VALUE if size is 0.
•CL_INVALID_EVENT_WAIT_LIST if
event_wait_list is NULL and num_events_in_wait_list is > 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_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_COPY_OVERLAP if src_buffer and
dst_buffer are the same buffer or subbuffer object and the source and
destination regions overlap or if src_buffer and dst_buffer are
different sub-buffers of the same associated buffer object and they overlap.
The regions overlap if src_offset ≤ to dst_offset
≤ to src_offset + size - 1, or if dst_offset ≤ to
src_offset ≤ to dst_offset + size - 1.
•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[1]
SEE ALSO¶
clEnqueueReadBuffer(3clc),
clEnqueueWriteBuffer(3clc), clCreateBuffer(3clc),
clCreateSubBuffer(3clc), clEnqueueCopyBufferToImage(3clc),
clEnqueueCopyImageToBuffer(3clc)
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 5.2.2 - Reading, Writing, Copying Buffer
Objects
