76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
/*
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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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#ifdef __UTIL_NOISE_TURBULENCE_IPP
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#error
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#endif
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#define __UTIL_NOISE_TURBULENCE_IPP
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#include "../hash/wang.hpp"
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namespace util { namespace noise {
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename D, typename P>
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turbulence<T,D,P>::turbulence (seed_t _seed,
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vector<2,T> _scale):
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data (_seed),
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perturb {
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hash::wang (_seed),
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hash::wang (hash::wang (_seed))
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},
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scale (_scale)
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{ ; }
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////////////////////////////////////////////////////////////////////////////
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template <typename T, typename D, typename P>
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typename turbulence<T,D,P>::seed_t
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turbulence<T,D,P>::seed (void) const
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{
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return data.seed ();
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}
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//-------------------------------------------------------------------------
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template <typename T, typename D, typename P>
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typename turbulence<T,D,P>::seed_t
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turbulence<T,D,P>::seed (seed_t _seed)
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{
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auto ret = _seed;
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data.seed (_seed); _seed = hash::wang (_seed);
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perturb[0].seed (_seed); _seed = hash::wang (_seed);
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perturb[1].seed (_seed); _seed = hash::wang (_seed);
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return ret;
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}
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename D, typename P>
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constexpr T
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turbulence<T,D,P>::operator() (point<2,T> p) const
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{
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vector<2,T> n = {
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perturb[0] (p),
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perturb[1] (p)
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};
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// scale by the data frequency so that we match scale
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return data (p + n * scale / data.frequency ());
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}
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} }
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