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