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65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
#ifndef SPROUT_DARKROOM_LIGHTS_LIGHT_LIST_HPP
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#define SPROUT_DARKROOM_LIGHTS_LIGHT_LIST_HPP
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#include <limits>
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#include <sprout/config.hpp>
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#include <sprout/index_tuple.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include <sprout/darkroom/access/access.hpp>
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#include <sprout/darkroom/colors/rgb.hpp>
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namespace sprout {
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namespace darkroom {
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namespace lights {
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//
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// light_list
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//
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template<typename... Lights>
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class light_list {
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public:
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typedef sprout::tuples::tuple<Lights...> lights_type;
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typedef typename sprout::darkroom::access::unit<lights_type>::type::color_type color_type;
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private:
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lights_type lights_;
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private:
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template<typename Color>
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SPROUT_CONSTEXPR color_type shade_2(Color const& col) const {
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return col;
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}
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template<typename Color1, typename Color2, typename... Tail>
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SPROUT_CONSTEXPR color_type shade_2(Color1 const& col1, Color2 const& col2, Tail const&... tail) const {
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return shade_2(
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sprout::darkroom::colors::add(col1, col2),
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tail...
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);
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}
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template<typename Intersection, typename Objects, sprout::index_t... Indexes>
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SPROUT_CONSTEXPR color_type shade_1(
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Intersection const& inter, Objects const& objs,
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sprout::index_tuple<Indexes...>
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) const
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{
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return shade_2(sprout::darkroom::access::get<Indexes>(lights_).template operator()(inter, objs)...);
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}
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public:
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explicit SPROUT_CONSTEXPR light_list(Lights const&... lights)
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: lights_(lights...)
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{}
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template<typename Intersection, typename Objects>
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SPROUT_CONSTEXPR color_type operator()(Intersection const& inter, Objects const& objs) const {
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return shade_1(inter, objs, sprout::index_range<0, sizeof...(Lights)>::make());
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}
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};
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//
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// make_light_list
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//
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template<typename... Lights>
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inline SPROUT_CONSTEXPR sprout::darkroom::lights::light_list<Lights...>
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make_light_list(Lights const&... lights) {
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return sprout::darkroom::lights::light_list<Lights...>(lights...);
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}
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} // namespace lights
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} // namespace darkroom
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} // namespace sprout
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#endif // #ifndef SPROUT_DARKROOM_LIGHTS_LIGHT_LIST_HPP
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