100 lines
3.1 KiB
Plaintext
100 lines
3.1 KiB
Plaintext
//---------------------------------------------------------------------------//
|
|
// 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_ALGORITHM_SCATTER_HPP
|
|
#define BOOST_COMPUTE_ALGORITHM_SCATTER_HPP
|
|
|
|
#include <boost/algorithm/string/replace.hpp>
|
|
|
|
#include <boost/compute/system.hpp>
|
|
#include <boost/compute/exception.hpp>
|
|
#include <boost/compute/command_queue.hpp>
|
|
#include <boost/compute/iterator/buffer_iterator.hpp>
|
|
#include <boost/compute/type_traits/type_name.hpp>
|
|
#include <boost/compute/detail/iterator_range_size.hpp>
|
|
#include <boost/compute/detail/meta_kernel.hpp>
|
|
|
|
namespace boost {
|
|
namespace compute {
|
|
namespace detail {
|
|
|
|
template<class InputIterator, class MapIterator, class OutputIterator>
|
|
class scatter_kernel : meta_kernel
|
|
{
|
|
public:
|
|
scatter_kernel() : meta_kernel("scatter")
|
|
{}
|
|
|
|
void set_range(InputIterator first,
|
|
InputIterator last,
|
|
MapIterator map,
|
|
OutputIterator result)
|
|
{
|
|
m_count = iterator_range_size(first, last);
|
|
m_input_offset = first.get_index();
|
|
m_output_offset = result.get_index();
|
|
|
|
m_input_offset_arg = add_arg<uint_>("input_offset");
|
|
m_output_offset_arg = add_arg<uint_>("output_offset");
|
|
|
|
*this <<
|
|
"const uint i = get_global_id(0);\n" <<
|
|
"uint i1 = " << map[expr<uint_>("i")] <<
|
|
" + output_offset;\n" <<
|
|
"uint i2 = i + input_offset;\n" <<
|
|
result[expr<uint_>("i1")] << "=" <<
|
|
first[expr<uint_>("i2")] << ";\n";
|
|
}
|
|
|
|
event exec(command_queue &queue)
|
|
{
|
|
if(m_count == 0) {
|
|
return event();
|
|
}
|
|
|
|
set_arg(m_input_offset_arg, uint_(m_input_offset));
|
|
set_arg(m_output_offset_arg, uint_(m_output_offset));
|
|
|
|
return exec_1d(queue, 0, m_count);
|
|
}
|
|
|
|
private:
|
|
size_t m_count;
|
|
size_t m_input_offset;
|
|
size_t m_input_offset_arg;
|
|
size_t m_output_offset;
|
|
size_t m_output_offset_arg;
|
|
};
|
|
|
|
} // end detail namespace
|
|
|
|
/// Copies the elements from the range [\p first, \p last) to the range
|
|
/// beginning at \p result using the output indices from the range beginning
|
|
/// at \p map.
|
|
///
|
|
/// \see gather()
|
|
template<class InputIterator, class MapIterator, class OutputIterator>
|
|
inline void scatter(InputIterator first,
|
|
InputIterator last,
|
|
MapIterator map,
|
|
OutputIterator result,
|
|
command_queue &queue = system::default_queue())
|
|
{
|
|
detail::scatter_kernel<InputIterator, MapIterator, OutputIterator> kernel;
|
|
|
|
kernel.set_range(first, last, map, result);
|
|
kernel.exec(queue);
|
|
}
|
|
|
|
} // end compute namespace
|
|
} // end boost namespace
|
|
|
|
#endif // BOOST_COMPUTE_ALGORITHM_SCATTER_HPP
|