49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2012 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_NOISE_LUT_HPP
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#define __UTIL_NOISE_LUT_HPP
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#include <cstdlib>
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#include <type_traits>
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#include "types.hpp"
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namespace util {
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namespace noise {
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extern const size_t PERM[256];
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extern const double LUT [256];
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template <typename T>
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typename std::enable_if<std::is_integral<T>::value, size_t>::type
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permute (T idx) {
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return PERM[(size_t)idx % elems (PERM)];
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}
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template <typename T1, typename T2, typename ...R>
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size_t permute (T1 t1, T2 t2, R ...r) {
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auto p = permute (t1);
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p += permute (t2, r...);
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return p % elems (PERM);
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}
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}
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}
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#endif
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