72 lines
2.2 KiB
C++
72 lines
2.2 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_RMF_HPP
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#define __UTIL_NOISE_FRACTAL_RMF_HPP
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#include <cstdint>
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#include "base.hpp"
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#include "../../point.hpp"
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namespace util { namespace noise { namespace fractal {
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/// Rigid Multifractal summation, based on Musgrave's algorithm
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///
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/// octaves: count of layers to be summed
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/// H: hurst parameter (~roughness)
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/// offset: TODO
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/// frequency: point scaling factor for the base octave
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/// lacunarity: incremental octave frequency scaling factor
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/// amplitude: value scaling factor for the base octave
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/// gain: incremental octave value scaling factor
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template <class B>
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struct rmf : public base<B> {
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using value_t = typename base<B>::value_t;
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using point_t = typename base<B>::point_t;
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static constexpr unsigned DEFAULT_OCTAVES = 5;
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static constexpr value_t DEFAULT_H = 1;
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static constexpr value_t DEFAULT_OFFSET = 1;
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static constexpr value_t DEFAULT_FREQUENCY = 1;
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static constexpr value_t DEFAULT_LACUNARITY = 2;
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static constexpr value_t DEFAULT_AMPLITUDE = 2;
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static constexpr value_t DEFAULT_GAIN = 1 / DEFAULT_LACUNARITY;
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rmf (seed_t,
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unsigned octaves,
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value_t H,
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value_t frequency,
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value_t lacunarity,
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value_t amplitude,
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value_t gain,
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value_t offset);
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explicit rmf (seed_t = 0);
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value_t operator() (point_t) const;
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value_t offset (void) const;
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value_t offset (value_t);
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private:
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value_t m_offset;
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};
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} } }
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#include "rmf.ipp"
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#endif
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