82 lines
2.6 KiB
C++
82 lines
2.6 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_RUNTIME_HPP
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#define __UTIL_NOISE_BASIS_RUNTIME_HPP
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#include "../fwd.hpp"
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#include "../../point.hpp"
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#include "../../range.hpp"
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#include <memory>
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namespace util { namespace noise { namespace basis {
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template <typename T>
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struct runtime {
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public:
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runtime (seed_t) {}
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runtime (runtime&&) = default;
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runtime (const runtime&) = delete;
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runtime& operator= (const runtime&) = delete;
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// basis functions
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T operator () (util::point<2,T> p) const { return (*m_child) (p); }
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range<T> bounds (void) const { return m_child->bounds (); }
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seed_t seed (void) const { return m_child->seed (); }
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seed_t seed (seed_t) { return m_child->seed (); }
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private:
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struct base {
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virtual ~base () = default;
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virtual T operator() (util::point<2,T>) const = 0;
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virtual range<T> bounds (void) const = 0;
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virtual seed_t seed (void) const = 0;
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virtual seed_t seed (seed_t) = 0;
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};
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template <typename B>
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struct child : public base {
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template <typename ...Args>
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child (seed_t _seed, Args&& ...args): data (_seed, std::forward<Args> (args)...) { }
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virtual T operator() (util::point<2,T> p) const override { return data (p); }
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virtual range<T> bounds (void) const override { return data.bounds (); }
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virtual seed_t seed (void) const override { return data.seed (); }
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virtual seed_t seed (seed_t _seed) override { return data.seed (_seed); }
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private:
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B data;
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};
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std::unique_ptr<base> m_child;
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public:
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template <typename B, typename ...Args>
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void
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reset (seed_t _seed, Args&& ...args)
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{
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using basis_t = B;
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using child_t = child<basis_t>;
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m_child.reset (new child_t (_seed, std::forward<Args> (args)...));
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}
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};
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} } }
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#endif
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