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https://github.com/bolero-MURAKAMI/Sprout
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sprout/darkroom/* 追加
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bolero-MURAKAMI
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commit
212e9ea652
27 changed files with 1692 additions and 4 deletions
76
sprout/darkroom/objects/intersect.hpp
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76
sprout/darkroom/objects/intersect.hpp
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#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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SPROUT_CONSTEXPR inline 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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SPROUT_CONSTEXPR inline 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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244
sprout/darkroom/objects/sphere.hpp
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244
sprout/darkroom/objects/sphere.hpp
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#ifndef SPROUT_DARKROOM_OBJECTS_SPHERE_HPP
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#define SPROUT_DARKROOM_OBJECTS_SPHERE_HPP
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#include <cstddef>
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#include <cmath>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include <sprout/tuple/functions.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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#include <sprout/darkroom/rays/ray.hpp>
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#include <sprout/darkroom/materials/material.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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// basic_sphere
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//
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template<typename Material, typename Position = sprout::darkroom::coords::vector3d>
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class basic_sphere {
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public:
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typedef Material material_type;
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typedef Position position_type;
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typedef typename sprout::darkroom::access::unit<position_type>::type unit_type;
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typedef unit_type radius_type;
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public:
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template<typename Ray>
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struct intersection {
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typedef sprout::tuples::tuple<
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bool,
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unit_type,
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position_type,
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position_type,
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decltype(sprout::darkroom::materials::calc_material(
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std::declval<material_type const&>(),
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std::declval<position_type const&>(),
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std::declval<position_type const&>()
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))
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> type;
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};
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private:
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typedef sprout::tuples::tuple<int, bool, unit_type> zwo_type;
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typedef sprout::tuples::tuple<position_type, position_type> drei_type;
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struct zw {
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SPROUT_STATIC_CONSTEXPR std::size_t hit_side = 0;
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SPROUT_STATIC_CONSTEXPR std::size_t does_intersect = 1;
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SPROUT_STATIC_CONSTEXPR std::size_t distance = 2;
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};
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struct dr {
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SPROUT_STATIC_CONSTEXPR std::size_t point_of_intersection = 0;
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SPROUT_STATIC_CONSTEXPR std::size_t normal = 1;
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};
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private:
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position_type pos_;
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radius_type rad_;
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material_type mat_;
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private:
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template<typename Ray>
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SPROUT_CONSTEXPR zwo_type zweitens_2(
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Ray const& ray,
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unit_type const& i1,
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unit_type const& i2,
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int hit_side,
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bool does_intersect
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) const
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{
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return zwo_type(
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hit_side,
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does_intersect,
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hit_side < 0 ? i2
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: hit_side > 0 ? i1
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: -1
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);
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}
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template<typename Ray>
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SPROUT_CONSTEXPR zwo_type zweitens_1(
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Ray const& ray,
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unit_type const& i1,
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unit_type const& i2
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) const
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{
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return zweitens_2(
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ray,
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i1,
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i2,
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i2 > 0
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? i1 < 0 ? -1 : 1
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: 0
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,
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i2 > 0
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);
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}
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template<typename Ray>
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SPROUT_CONSTEXPR zwo_type zweitens(
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Ray const& ray,
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bool neg,
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unit_type const& b,
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unit_type const& det
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) const
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{
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return neg
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? zweitens_1(ray, b - det, b + det)
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: zwo_type(0, false, -1)
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;
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}
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template<typename Ray>
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SPROUT_CONSTEXPR drei_type drittens_1(
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Ray const& ray,
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typename sprout::darkroom::access::unit<Ray>::type point_of_intersection
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) const
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{
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return drei_type(
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point_of_intersection,
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sprout::darkroom::coords::normalize(
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sprout::darkroom::coords::sub(point_of_intersection, pos_)
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)
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);
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}
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template<typename Ray>
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SPROUT_CONSTEXPR drei_type drittens(
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Ray const& ray,
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bool neg,
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unit_type const& distance
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) const
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{
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return neg
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? drittens_1(ray, sprout::darkroom::rays::point_of_intersection(ray, distance))
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: drei_type(
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sprout::tuples::make_clone<position_type>(0, 0, 0),
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sprout::tuples::make_clone<position_type>(1, 1, 1)
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)
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;
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}
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template<typename Ray>
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SPROUT_CONSTEXPR typename intersection<Ray>::type intersect_5(
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Ray const& ray,
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zwo_type const& zwo,
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drei_type const& drei
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) const
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{
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return typename intersection<Ray>::type(
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sprout::tuples::get<zw::does_intersect>(zwo),
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sprout::tuples::get<zw::distance>(zwo),
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sprout::tuples::get<dr::point_of_intersection>(drei),
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sprout::tuples::get<dr::normal>(drei),
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sprout::darkroom::materials::calc_material(
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mat_,
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sprout::tuples::get<dr::point_of_intersection>(drei),
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sprout::tuples::get<dr::normal>(drei)
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)
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);
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}
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template<typename Ray>
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SPROUT_CONSTEXPR typename intersection<Ray>::type intersect_4(
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Ray const& ray,
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zwo_type const& zwo
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) const
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{
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return intersect_5(
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ray,
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zwo,
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drittens(
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ray,
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sprout::tuples::get<zw::does_intersect>(zwo),
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sprout::tuples::get<zw::distance>(zwo)
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)
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);
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}
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template<typename Ray>
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SPROUT_CONSTEXPR typename intersection<Ray>::type intersect_3(
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Ray const& ray,
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unit_type const& b,
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unit_type const& det_sq
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) const
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{
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using std::sqrt;
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return intersect_4(
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ray,
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zweitens(
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ray,
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det_sq > 0,
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b,
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sqrt(det_sq)
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)
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);
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}
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template<typename Ray>
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SPROUT_CONSTEXPR typename intersection<Ray>::type intersect_2(
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Ray const& ray,
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position_type const& v,
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unit_type const& b
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) const
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{
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return intersect_3(
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ray,
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b,
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b * b - sprout::darkroom::coords::length_sq(v) + rad_ * rad_
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);
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}
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template<typename Ray>
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SPROUT_CONSTEXPR typename intersection<Ray>::type intersect_1(
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Ray const& ray,
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position_type const& v
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) const
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{
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return intersect_2(
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ray,
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v,
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-sprout::darkroom::coords::dot(v, sprout::darkroom::rays::direction(ray))
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);
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}
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public:
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SPROUT_CONSTEXPR basic_sphere(
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position_type const& pos,
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radius_type rad,
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material_type const& mat
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)
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: pos_(pos)
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, rad_(rad)
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, mat_(mat)
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{};
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template<typename Ray>
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SPROUT_CONSTEXPR typename intersection<Ray>::type intersect(Ray const& ray) const {
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return intersect_1(
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ray,
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sprout::darkroom::coords::sub(sprout::darkroom::rays::position(ray), pos_)
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);
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}
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};
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//
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// make_sphere
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//
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template<typename Material, typename Position, typename Radius>
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SPROUT_CONSTEXPR inline sprout::darkroom::objects::basic_sphere<Material, Position>
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make_sphere(Position const& pos, Radius const& rad, Material const& mat) {
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return sprout::darkroom::objects::basic_sphere<Material, Position>(pos, rad, mat);
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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_SPHERE_HPP
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