84 lines
2.2 KiB
C++
84 lines
2.2 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 2012-2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_NOISE_BASIS_HPP
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#define __UTIL_NOISE_BASIS_HPP
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#include <cstdlib>
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#include "lerp.hpp"
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#include "../range.hpp"
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namespace util {
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namespace noise {
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template <typename T> using lerp_t = T (*)(T,T,T);
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template <typename T>
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struct basis {
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typedef uint64_t seed_t;
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basis (seed_t);
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basis ();
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virtual ~basis ();
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seed_t seed;
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virtual range<T> bounds (void) const = 0;
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virtual T operator() (T x, T y) const = 0;
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};
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/// Single value per grid space
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template <typename T, lerp_t<T>>
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struct value : public basis<T> {
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using seed_t = typename basis<T>::seed_t;
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value (seed_t);
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value ();
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virtual range<T> bounds (void) const final;
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virtual T operator() (T x, T y) const final;
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};
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/// Perlin: interpolated value across each grid space
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template <typename T, lerp_t<T> L>
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struct gradient : public basis<T> {
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using seed_t = typename basis<T>::seed_t;
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gradient (seed_t);
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gradient ();
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virtual range<T> bounds (void) const final;
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virtual T operator() (T x, T y) const final;
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};
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/// Cellular/Worley/Vornoi of order-1
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template <typename T>
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struct cellular : public basis<T> {
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using seed_t = typename basis<T>::seed_t;
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cellular (seed_t);
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cellular ();
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virtual range<T> bounds (void) const final;
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virtual T operator() (T x, T y) const final;
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};
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}
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}
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#endif
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