Danny Robson
6278902e3e
some working variables need to be precomputed. it makes sense to do this in a base class.
62 lines
1.8 KiB
C++
62 lines
1.8 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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#ifndef __UTIL_NOISE_FRACTAL_HMF_HPP
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#define __UTIL_NOISE_FRACTAL_HMF_HPP
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#include <cstdint>
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#include "../../point.hpp"
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namespace util { namespace noise { namespace fractal {
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///////////////////////////////////////////////////////////////////////
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/// Musgrave's "Hybrid MultiFractal"
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template <typename T, typename B>
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struct hmf : public base<T,B> {
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using seed_t = typename base<T,B>::seed_t;
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// H should be fairly low due to the decreasing weight parameter in eval
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static constexpr unsigned DEFAULT_OCTAVES = 6;
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static constexpr T DEFAULT_H = T(0.25);
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static constexpr T DEFAULT_FREQUENCY = T(0.1);
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static constexpr T DEFAULT_LACUNARITY = 2;
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static constexpr T DEFAULT_AMPLITUDE = 1;
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static constexpr T DEFAULT_GAIN = 1 / DEFAULT_LACUNARITY;
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static constexpr T DEFAULT_OFFSET = T(0.7);
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hmf (seed_t,
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unsigned octaves,
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T H,
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T frequency,
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T lacunarity,
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T amplitude,
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T gain,
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T offset);
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hmf (seed_t);
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constexpr T operator() (point<2,T>) const;
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private:
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T m_offset;
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};
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} } }
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#include "hmf.ipp"
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#endif
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