libcruft-util/noise/fractal.hpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
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* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2012 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_NOISE_FRACTAL_HPP
#define __UTIL_NOISE_FRACTAL_HPP
#include "basis.hpp"
namespace util {
namespace noise {
struct fractal {
fractal (unsigned octaves,
double frequency,
double lacunarity);
fractal ();
virtual ~fractal ();
unsigned octaves;
double frequency;
double lacunarity;
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virtual double operator() (double x, double y) const { return eval (x, y); };
virtual double eval (double x, double y) const = 0;
};
template <typename B>
struct fbm : public fractal {
fbm (unsigned octaves,
double frequency,
double lacunarity,
basis::seed_t seed);
fbm ();
B basis;
virtual double eval (double x, double y) const;
};
template <typename B>
struct musgrave : public fractal {
musgrave (unsigned octaves,
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double frequency,
double lacunarity,
basis::seed_t seed);
musgrave ();
B basis;
virtual double eval (double x, double y) const;
};
}
}
#endif