OpenCL Programming by Example

Copying buffers

The two functions clEnqueueCopyBuffer and clEnqueueCopyBufferRect enable the application to copy data between two OpenCL buffer objects. It is equivalent to reading the buffer back from device to host and then writing it back to a destination cl_mem object. This mechanism is provided by these copy buffer routines:

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)

This OpenCL API enqueue's a command to copy a cl_mem buffer object identified by src_buffer to another cl_mem object destination buffer, dst_buffer. Remaining parameters like offset and events are similar ...