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- //---------------------------------------------------------------------------//
- // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
- //
- // Distributed under the Boost Software License, Version 1.0
- // See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt
- //
- // See http://boostorg.github.com/compute for more information.
- //---------------------------------------------------------------------------//
- #ifndef BOOST_COMPUTE_DETAIL_READ_WRITE_SINGLE_VALUE_HPP
- #define BOOST_COMPUTE_DETAIL_READ_WRITE_SINGLE_VALUE_HPP
- #include <boost/throw_exception.hpp>
- #include <boost/compute/buffer.hpp>
- #include <boost/compute/event.hpp>
- #include <boost/compute/exception.hpp>
- #include <boost/compute/command_queue.hpp>
- namespace boost {
- namespace compute {
- namespace detail {
- // reads and returns a single value at index in the buffer
- template<class T>
- 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;
- }
- // reads and returns a the first value in the buffer
- template<class T>
- inline T read_single_value(const buffer &buffer, command_queue &queue)
- {
- return read_single_value<T>(buffer, 0, queue);
- }
- // writes a single value at index to the buffer
- template<class T>
- inline event write_single_value(const T &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());
- return queue.enqueue_write_buffer(buffer,
- index * sizeof(T),
- sizeof(T),
- &value);
- }
- // writes value to the first location in buffer
- template<class T>
- inline void write_single_value(const T &value,
- const buffer &buffer,
- command_queue &queue)
- {
- write_single_value<T>(value, buffer, 0, queue);
- }
- } // end detail namespace
- } // end compute namespace
- } // end boost namespace
- #endif // BOOST_COMPUTE_DETAIL_READ_WRITE_SINGLE_VALUE_HPP
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