libcruft-util/noise/fractal.hpp

75 lines
2.1 KiB
C++

/*
* 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
*
* 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 {
/// Base noise summation
struct fractal {
fractal (unsigned octaves,
double frequency,
double lacunarity);
fractal ();
virtual ~fractal ();
unsigned octaves;
double frequency;
double lacunarity;
virtual double operator() (double x, double y) const { return eval (x, y); };
virtual double eval (double x, double y) const = 0;
};
/// Fractal Brownian Motion summation.
template <typename B>
struct fbm : public fractal {
using seed_t = typename basis<double>::seed_t;
fbm (unsigned octaves,
double frequency,
double lacunarity,
seed_t seed);
fbm ();
B basis;
virtual double eval (double x, double y) const;
};
/// Rigid Multifractal noise summation.
template <typename B>
struct musgrave : public fractal {
using seed_t = typename basis<double>::seed_t;
musgrave (unsigned octaves,
double frequency,
double lacunarity,
seed_t seed);
musgrave ();
B basis;
virtual double eval (double x, double y) const;
};
}
}
#endif