code: func CopyBufferSubData(readTarget uint32, writeTarget uint32, readOffset int, writeOffset int, size int) {
  	syscall.Syscall6(gpCopyBufferSubData, 5, uintptr(readTarget), uintptr(writeTarget), uintptr(readOffset), uintptr(writeOffset), uintptr(size), 0)
  }
docs: // copy all or part of the data store of a buffer object to the data store of another buffer object