49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2012-2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_NOISE_TURBULENCE_HPP
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#define __UTIL_NOISE_TURBULENCE_HPP
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#include "../point.hpp"
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#include "../vector.hpp"
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#include <cstdint>
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namespace util { namespace noise {
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/// perturb the evaluation point of a noise function by the results of
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/// a per-dimension noise function
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///
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/// assumes the pertubation function is roughly symetrical around 0.
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/// nothing will explode if it isn't, but you'll see strong directional
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/// artefacts with higher scaling factors.
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template <typename T, typename D, typename P>
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struct turbulence {
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using seed_t = uint64_t;
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turbulence (seed_t, vector<2,T> scale);
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constexpr T operator() (point<2,T>) const;
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D data;
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P perturb[2];
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vector<2,T> scale;
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};
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} }
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#include "turbulence.ipp"
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#endif
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