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101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
#ifndef SPROUT_DARKROOM_LIGHTS_PARALLEL_LIGHT_HPP
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#define SPROUT_DARKROOM_LIGHTS_PARALLEL_LIGHT_HPP
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#include <limits>
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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/colors/rgb.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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#include <sprout/darkroom/intersects/intersection.hpp>
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#include <sprout/darkroom/objects/intersect.hpp>
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#include HDR_ALGORITHM_MIN_MAX_SSCRISK_CEL_OR_SPROUT
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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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// basic_parallel_light
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//
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template<
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typename Position = sprout::darkroom::coords::vector3d_t,
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typename Color = sprout::darkroom::colors::rgb_f_t
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>
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class basic_parallel_light {
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public:
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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 Color color_type;
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private:
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position_type dir_;
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color_type col_;
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private:
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template<typename Intersection>
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SPROUT_CONSTEXPR color_type
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shade_2(Intersection const& inter, unit_type const& intensity) const {
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return sprout::darkroom::colors::mul(
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sprout::darkroom::colors::filter(
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col_,
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sprout::darkroom::materials::color(sprout::darkroom::intersects::material(inter))
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),
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intensity
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);
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}
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template<typename Intersection, typename LightRayIntersection>
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SPROUT_CONSTEXPR color_type
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shade_1(Intersection const& inter, LightRayIntersection const& light_ray_inter) const {
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return shade_2(
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inter,
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!sprout::darkroom::intersects::does_intersect(light_ray_inter)
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|| sprout::darkroom::intersects::distance(light_ray_inter)
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< std::numeric_limits<unit_type>::epsilon()
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? NS_SSCRISK_CEL_OR_SPROUT::max(
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std::numeric_limits<unit_type>::epsilon(),
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sprout::darkroom::coords::dot(
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dir_,
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sprout::darkroom::intersects::normal(inter)
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)
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)
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: 0
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);
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}
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public:
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SPROUT_CONSTEXPR basic_parallel_light(position_type const& dir, color_type const& col)
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: dir_(sprout::darkroom::coords::normalize(dir))
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, col_(col)
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{}
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template<typename Intersection, typename Objects>
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SPROUT_CONSTEXPR color_type
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operator()(Intersection const& inter, Objects const& objs) const {
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return shade_1(
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inter,
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sprout::darkroom::objects::intersect_list(
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objs,
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sprout::darkroom::rays::make_ray(
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sprout::darkroom::coords::add(
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sprout::darkroom::coords::scale(
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dir_,
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std::numeric_limits<unit_type>::epsilon() * 256
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),
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sprout::darkroom::intersects::point_of_intersection(inter)
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),
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dir_
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)
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)
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);
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}
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};
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//
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// make_parallel_light
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//
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template<typename Position, typename Color>
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inline SPROUT_CONSTEXPR sprout::darkroom::lights::basic_parallel_light<Position, Color>
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make_parallel_light(Position const& pos, Color const& col) {
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return sprout::darkroom::lights::basic_parallel_light<Position, Color>(pos, col);
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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_PARALLEL_LIGHT_HPP
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