75 lines
2.1 KiB
C++
75 lines
2.1 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 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_NOISE_FRACTAL_HPP
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#define __UTIL_NOISE_FRACTAL_HPP
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#include "basis.hpp"
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namespace util {
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namespace noise {
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/// Base noise summation
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struct fractal {
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fractal (unsigned octaves,
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double frequency,
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double lacunarity);
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fractal ();
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virtual ~fractal ();
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unsigned octaves;
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double frequency;
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double lacunarity;
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virtual double operator() (double x, double y) const { return eval (x, y); };
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virtual double eval (double x, double y) const = 0;
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};
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/// Fractal Brownian Motion summation.
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template <typename B>
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struct fbm : public fractal {
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using seed_t = typename basis<double>::seed_t;
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fbm (unsigned octaves,
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double frequency,
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double lacunarity,
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seed_t seed);
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fbm ();
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B basis;
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virtual double eval (double x, double y) const;
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};
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/// Rigid Multifractal noise summation.
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template <typename B>
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struct musgrave : public fractal {
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using seed_t = typename basis<double>::seed_t;
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musgrave (unsigned octaves,
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double frequency,
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double lacunarity,
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seed_t seed);
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musgrave ();
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B basis;
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virtual double eval (double x, double y) const;
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};
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}
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}
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#endif
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