libcruft-util/noise/basis.hpp

76 lines
2.0 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 2012-2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_NOISE_BASIS_HPP
#define __UTIL_NOISE_BASIS_HPP
#include <cstdlib>
#include "lerp.hpp"
#include "../range.hpp"
namespace util {
namespace noise {
template <typename T> using lerp_t = T (*)(T,T,T);
struct basis {
typedef uint64_t seed_t;
basis (seed_t);
basis ();
virtual ~basis ();
seed_t seed;
virtual range<double> bounds (void) const = 0;
virtual double eval (double x, double y) const = 0;
};
/// Perlin: single value per grid space
template <lerp_t<double>>
struct value : public basis {
value (seed_t);
value ();
virtual range<double> bounds (void) const;
virtual double eval (double x, double y) const;
};
/// Perlin: interpolated value across each grid space
template <lerp_t<double>L>
struct gradient : public basis {
gradient (seed_t);
gradient ();
virtual range<double> bounds (void) const;
virtual double eval (double x, double y) const;
};
/// Cellular/Worley/Vornoi of order-1
struct cellular : public basis {
cellular (seed_t);
cellular ();
virtual range<double> bounds (void) const;
virtual double eval (double x, double y) const;
};
}
}
#endif