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https://github.com/bolero-MURAKAMI/Sprout.git
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76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
#ifndef SPROUT_DARKROOM_OBJECTS_INTERSECT_HPP
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#define SPROUT_DARKROOM_OBJECTS_INTERSECT_HPP
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#include <cstddef>
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#include <sprout/config.hpp>
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#include <sprout/darkroom/access/access.hpp>
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#include <sprout/darkroom/intersects/intersection.hpp>
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namespace sprout {
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namespace darkroom {
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namespace objects {
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//
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// intersect
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//
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template<typename Object, typename Ray>
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inline SPROUT_CONSTEXPR typename Object::template intersection<Ray>::type
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intersect(Object const& obj, Ray const& ray) {
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return obj.intersect(ray);
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}
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//
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// intersect_list
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//
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namespace detail {
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template<std::size_t N>
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struct intersect_list_impl {
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private:
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template<typename Objects, typename Ray, typename A, typename B>
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SPROUT_CONSTEXPR typename sprout::darkroom::access::unit<Objects>::type
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::template intersection<Ray>::type
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comp(A const& a, B const& b) const {
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return sprout::darkroom::intersects::does_intersect(a)
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&& sprout::darkroom::intersects::does_intersect(b)
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? sprout::darkroom::intersects::distance(a) < sprout::darkroom::intersects::distance(b)
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? a
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: b
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: sprout::darkroom::intersects::does_intersect(a)
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? a
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: b
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;
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}
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public:
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template<typename Objects, typename Ray>
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SPROUT_CONSTEXPR typename sprout::darkroom::access::unit<Objects>::type
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::template intersection<Ray>::type
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operator()(Objects const& objs, Ray const& ray) const {
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return comp<Objects, Ray>(
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sprout::darkroom::objects::intersect(sprout::darkroom::access::get<N>(objs), ray),
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intersect_list_impl<N - 1>()(objs, ray)
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);
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}
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};
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template<>
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struct intersect_list_impl<0> {
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public:
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template<typename Objects, typename Ray>
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SPROUT_CONSTEXPR typename sprout::darkroom::access::unit<Objects>::type
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::template intersection<Ray>::type
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operator()(Objects const& objs, Ray const& ray) const {
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return sprout::darkroom::objects::intersect(sprout::darkroom::access::get<0>(objs), ray);
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}
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};
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} // namespace detail
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template<typename Objects, typename Ray>
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inline SPROUT_CONSTEXPR typename sprout::darkroom::access::unit<Objects>::type
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::template intersection<Ray>::type
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intersect_list(Objects const& objs, Ray const& ray) {
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return sprout::darkroom::objects::detail::intersect_list_impl<
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sprout::darkroom::access::size<Objects>::value - 1
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>()(objs, ray);
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}
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} // namespace objects
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} // namespace darkroom
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} // namespace sprout
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#endif // #ifndef SPROUT_DARKROOM_OBJECTS_INTERSECT_HPP
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