C++ (Cpp) command_queue::enqueue_read_buffer Examples

Example #1

File: read_write_single_value.hpp Project: AbhinavJain13/turicreate

inline T read_single_value(const buffer &buffer,
                           size_t index,
                           command_queue &queue)
{
    BOOST_ASSERT(index < buffer.size() / sizeof(T));
    BOOST_ASSERT(buffer.get_context() == queue.get_context());

    T value;
    queue.enqueue_read_buffer(buffer,
                              sizeof(T) * index,
                              sizeof(T),
                              &value);
    return value;
}

Example #2

File: copy_to_host.hpp Project: BeauJoh/compute

inline HostIterator copy_to_host(DeviceIterator first,
                                 DeviceIterator last,
                                 HostIterator result,
                                 command_queue &queue)
{
    typedef typename
        std::iterator_traits<DeviceIterator>::value_type
        value_type;

    size_t count = iterator_range_size(first, last);
    if(count == 0){
        return result;
    }

    const buffer &buffer = first.get_buffer();
    size_t offset = first.get_index();

    queue.enqueue_read_buffer(buffer,
                              offset * sizeof(value_type),
                              count * sizeof(value_type),
                              ::boost::addressof(*result));

    return iterator_plus_distance(result, count);
}