61 lines
1.6 KiB
C++
61 lines
1.6 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 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_NOISE_BASIS_EXPGRAD_HPP
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#define __UTIL_NOISE_BASIS_EXPGRAD_HPP
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#include "./gradient.hpp"
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#include "../fwd.hpp"
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#include "../../point.hpp"
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#include "../../range.hpp"
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///////////////////////////////////////////////////////////////////////////////
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// modifies a standard uniforma gradient generator to follow an exponential
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// distribution, base^(-t*exp)
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//
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//
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namespace util { namespace noise { namespace basis {
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template <
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size_t S, // probe point dimensionality
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typename T, // probe point value_type
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lerp_t<T> L // axis interpolation function
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>
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struct expgrad : public gradient<S,T,L> {
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explicit expgrad (seed_t seed,
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T base = (T)1.02,
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T exponent = T{256});
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T base (void) const;
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T base (T);
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T exponent (void) const;
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T exponent (T);
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protected:
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vector<S,T> generate (pointi<S>) const;
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T m_base;
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T m_exponent;
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};
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} } }
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#include "expgrad.ipp"
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#endif
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