예제 #1
0
    /// 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;
    }
예제 #2
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);
}