80 lines
2.4 KiB
Plaintext
80 lines
2.4 KiB
Plaintext
//---------------------------------------------------------------------------//
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// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#ifndef BOOST_COMPUTE_ALGORITHM_REVERSE_COPY_HPP
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#define BOOST_COMPUTE_ALGORITHM_REVERSE_COPY_HPP
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#include <iterator>
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#include <boost/compute/system.hpp>
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/algorithm/copy.hpp>
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#include <boost/compute/algorithm/reverse.hpp>
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namespace boost {
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namespace compute {
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namespace detail {
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template<class Iterator, class OutputIterator>
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struct reverse_copy_kernel : public meta_kernel
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{
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reverse_copy_kernel(Iterator first, Iterator last, OutputIterator result)
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: meta_kernel("reverse_copy")
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{
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// store size of the range
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m_size = detail::iterator_range_size(first, last);
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add_set_arg<const cl_uint>("size", static_cast<const cl_uint>(m_size));
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*this <<
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decl<cl_uint>("i") << " = get_global_id(0);\n" <<
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decl<cl_uint>("j") << " = size - get_global_id(0) - 1;\n" <<
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result[var<cl_uint>("j")] << "=" << first[var<cl_uint>("i")] << ";\n";
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}
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void exec(command_queue &queue)
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{
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exec_1d(queue, 0, m_size);
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}
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size_t m_size;
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};
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} // end detail namespace
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/// Copies the elements in the range [\p first, \p last) in reversed
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/// order to the range beginning at \p result.
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///
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/// \see reverse()
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template<class InputIterator, class OutputIterator>
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inline OutputIterator
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reverse_copy(InputIterator first,
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InputIterator last,
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OutputIterator result,
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command_queue &queue = system::default_queue())
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{
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typedef typename std::iterator_traits<OutputIterator>::difference_type difference_type;
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difference_type count = std::distance(first, last);
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detail::reverse_copy_kernel<InputIterator, OutputIterator>
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kernel(first, last, result);
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// run kernel
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kernel.exec(queue);
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// return iterator to the end of result
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return result + count;
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}
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_ALGORITHM_REVERSE_COPY_HPP
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