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https://github.com/bolero-MURAKAMI/Sprout.git
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97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2013 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_DARKROOM_RAYS_RAY_HPP
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#define SPROUT_DARKROOM_RAYS_RAY_HPP
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#include <sprout/config.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/darkroom/access/access.hpp>
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#include <sprout/darkroom/coords/vector.hpp>
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namespace sprout {
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namespace darkroom {
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namespace rays {
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//
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// position
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// direction
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//
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template<typename T>
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inline SPROUT_CONSTEXPR auto
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position(T&& t)
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SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::darkroom::access::get<0>(sprout::forward<T>(t))))
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-> decltype(sprout::darkroom::access::get<0>(sprout::forward<T>(t)))
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{
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return sprout::darkroom::access::get<0>(sprout::forward<T>(t));
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}
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template<typename T>
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inline SPROUT_CONSTEXPR auto
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direction(T&& t)
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SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::darkroom::access::get<1>(sprout::forward<T>(t))))
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-> decltype(sprout::darkroom::access::get<1>(sprout::forward<T>(t)))
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{
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return sprout::darkroom::access::get<1>(sprout::forward<T>(t));
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}
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//
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// make_ray
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//
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template<typename Position, typename Direction>
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inline SPROUT_CONSTEXPR sprout::tuples::tuple<Position, Direction>
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make_ray(Position const& pos, Direction const& dir) {
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return sprout::tuples::make_tuple(pos, dir);
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}
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//
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// ray
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//
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typedef sprout::tuples::tuple<sprout::darkroom::coords::vector3d_t, sprout::darkroom::coords::vector3d_t> ray;
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//
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// point_of_intersection
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//
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template<typename Ray, typename Distance>
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inline SPROUT_CONSTEXPR typename sprout::darkroom::access::unit<Ray>::type
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point_of_intersection(Ray const& ray, Distance const& dist) {
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return sprout::darkroom::coords::add(
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sprout::darkroom::rays::position(ray),
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sprout::darkroom::coords::scale(sprout::darkroom::rays::direction(ray), dist)
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);
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}
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//
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// detach_position
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//
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template<typename Position, typename Direction>
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inline SPROUT_CONSTEXPR Position
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detach_position(Position const& pos, Direction const& dir) {
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return sprout::darkroom::coords::add(
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pos,
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sprout::darkroom::coords::resize(
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dir,
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sprout::numeric_limits<typename sprout::darkroom::access::unit<Direction>::type>::epsilon() * 256
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)
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);
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}
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//
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// make_detached_ray
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//
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template<typename Position, typename Direction>
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inline SPROUT_CONSTEXPR sprout::tuples::tuple<Position, Direction>
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make_detached_ray(Position const& pos, Direction const& dir) {
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return sprout::darkroom::rays::make_ray(
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sprout::darkroom::rays::detach_position(pos, dir),
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dir
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);
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}
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} // namespace rays
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} // namespace darkroom
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} // namespace sprout
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#endif // #ifndef SPROUT_DARKROOM_RAYS_RAY_HPP
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