/// Unmaps the buffer from the host address space.
///
/// \see_opencl_ref{clEnqueueUnmapMemObject}
void unmap(command_queue &queue)
{
BOOST_ASSERT(m_mapped_ptr != 0);
queue.enqueue_unmap_buffer(m_buffer, m_mapped_ptr);
m_mapped_ptr = 0;
}
inline DeviceIterator copy_to_device_map(HostIterator first,
HostIterator last,
DeviceIterator result,
command_queue &queue,
const wait_list &events)
{
typedef typename
std::iterator_traits<DeviceIterator>::value_type
value_type;
typedef typename
std::iterator_traits<DeviceIterator>::difference_type
difference_type;
size_t count = iterator_range_size(first, last);
if(count == 0){
return result;
}
size_t offset = result.get_index();
// map result buffer to host
value_type *pointer = static_cast<value_type*>(
queue.enqueue_map_buffer(
result.get_buffer(),
CL_MAP_WRITE,
offset * sizeof(value_type),
count * sizeof(value_type),
events
)
);
// copy [first; last) to result buffer
std::copy(first, last, pointer);
// unmap result buffer
boost::compute::event unmap_event = queue.enqueue_unmap_buffer(
result.get_buffer(),
static_cast<void*>(pointer)
);
unmap_event.wait();
return result + static_cast<difference_type>(count);
}