45 lines
1.5 KiB
C++
45 lines
1.5 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_BASIS_EXPGRAD_IPP
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#error
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#endif
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#define __UTIL_NOISE_BASIS_EXPGRAD_IPP
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#include "../rand.hpp"
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namespace util { namespace noise { namespace basis {
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///////////////////////////////////////////////////////////////////////////
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template <typename T, util::noise::lerp_t<T> L>
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expgrad<T,L>::expgrad (seed_t _seed, T _base, T _exponent):
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gradient<T,L> (_seed),
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m_base (_base),
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m_exponent (_exponent)
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{ ; }
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///////////////////////////////////////////////////////////////////////////
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template <typename T, util::noise::lerp_t<T> L>
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vector<2,T>
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expgrad<T,L>::generate (point<2,intmax_t> p) const
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{
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auto t = (noise::rand<float> (this->seed (), p) + 1) / 2;
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auto factor = std::pow (m_base, -t * m_exponent);
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return factor * gradient<T,L>::generate (p);
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}
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} } }
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