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1 | //---------------------------------------------------------------------------// |
2 | // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com> | |
3 | // | |
4 | // Distributed under the Boost Software License, Version 1.0 | |
5 | // See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt | |
7 | // | |
8 | // See http://boostorg.github.com/compute for more information. | |
9 | //---------------------------------------------------------------------------// | |
10 | ||
11 | #ifndef BOOST_COMPUTE_ALGORITHM_GATHER_HPP | |
12 | #define BOOST_COMPUTE_ALGORITHM_GATHER_HPP | |
13 | ||
14 | #include <boost/compute/command_queue.hpp> | |
15 | #include <boost/compute/detail/iterator_range_size.hpp> | |
16 | #include <boost/compute/detail/meta_kernel.hpp> | |
17 | #include <boost/compute/exception.hpp> | |
18 | #include <boost/compute/iterator/buffer_iterator.hpp> | |
19 | #include <boost/compute/system.hpp> | |
20 | #include <boost/compute/type_traits/type_name.hpp> | |
21 | ||
22 | namespace boost { | |
23 | namespace compute { | |
24 | namespace detail { | |
25 | ||
26 | template<class InputIterator, class MapIterator, class OutputIterator> | |
27 | class gather_kernel : public meta_kernel | |
28 | { | |
29 | public: | |
30 | gather_kernel() : meta_kernel("gather") | |
31 | {} | |
32 | ||
33 | void set_range(MapIterator first, | |
34 | MapIterator last, | |
35 | InputIterator input, | |
36 | OutputIterator result) | |
37 | { | |
38 | m_count = iterator_range_size(first, last); | |
39 | ||
40 | *this << | |
41 | "const uint i = get_global_id(0);\n" << | |
42 | result[expr<uint_>("i")] << "=" << | |
43 | input[first[expr<uint_>("i")]] << ";\n"; | |
44 | } | |
45 | ||
46 | event exec(command_queue &queue) | |
47 | { | |
48 | if(m_count == 0) { | |
49 | return event(); | |
50 | } | |
51 | ||
52 | return exec_1d(queue, 0, m_count); | |
53 | } | |
54 | ||
55 | private: | |
56 | size_t m_count; | |
57 | }; | |
58 | ||
59 | } // end detail namespace | |
60 | ||
61 | /// Copies the elements using the indices from the range [\p first, \p last) | |
62 | /// to the range beginning at \p result using the input values from the range | |
63 | /// beginning at \p input. | |
64 | /// | |
65 | /// \see scatter() | |
66 | template<class InputIterator, class MapIterator, class OutputIterator> | |
67 | inline void gather(MapIterator first, | |
68 | MapIterator last, | |
69 | InputIterator input, | |
70 | OutputIterator result, | |
71 | command_queue &queue = system::default_queue()) | |
72 | { | |
73 | detail::gather_kernel<InputIterator, MapIterator, OutputIterator> kernel; | |
74 | ||
75 | kernel.set_range(first, last, input, result); | |
76 | kernel.exec(queue); | |
77 | } | |
78 | ||
79 | } // end compute namespace | |
80 | } // end boost namespace | |
81 | ||
82 | #endif // BOOST_COMPUTE_ALGORITHM_GATHER_HPP |