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Sprout/sprout/darkroom/renderers/whitted_style.hpp
bolero-MURAKAMI 63ac0d0df5 [sprout.darkroom] implement refraction process
2013-12-12 23:29:50 +09:00

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/*=============================================================================
Copyright (c) 2011-2013 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_DARKROOM_RENDERERS_WHITTED_STYLE_HPP
#define SPROUT_DARKROOM_RENDERERS_WHITTED_STYLE_HPP
#include <cstddef>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/limits.hpp>
#include <sprout/utility/pair.hpp>
#include <sprout/tuple/functions.hpp>
#include <sprout/tuple/tuple/type_traits.hpp>
#include <sprout/tuple/tuple/make_tuple.hpp>
#include <sprout/tuple/tuple/get.hpp>
//#include <sprout/tuple/operation/push_back.hpp>
//#include <sprout/tuple/operation/pop_back.hpp>
#include <sprout/darkroom/access/access.hpp>
#include <sprout/darkroom/colors/rgb.hpp>
#include <sprout/darkroom/coords/vector.hpp>
#include <sprout/darkroom/rays/ray.hpp>
#include <sprout/darkroom/materials/material.hpp>
#include <sprout/darkroom/intersects/intersection.hpp>
#include <sprout/darkroom/objects/intersect.hpp>
#include <sprout/darkroom/lights/calculate.hpp>
#include <sprout/darkroom/renderers/calculate.hpp>
#include <sprout/darkroom/renderers/infinity.hpp>
namespace sprout {
namespace darkroom {
namespace renderers {
//
// whitted_mirror
//
class whitted_mirror {
private:
template<
typename Color,
typename Camera, typename Objects, typename Lights,
typename Ray, typename Refractions, typename Intersection, typename Renderer,
typename Direction
>
SPROUT_CONSTEXPR Color
color_1(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, Intersection const& inter, Renderer const& renderer,
std::size_t depth_max, Refractions const& refracs,
Direction const& new_dir
) const
{
return sprout::darkroom::renderers::calculate<Color>(
renderer,
camera, objs, lights,
sprout::tuples::remake<Ray>(
ray,
sprout::darkroom::rays::detach_position(sprout::darkroom::intersects::point_of_intersection(inter), new_dir),
new_dir
),
depth_max - 1,
refracs
);
}
public:
template<
typename Color,
typename Camera, typename Objects, typename Lights,
typename Ray, typename Refractions, typename Intersection, typename Renderer
>
SPROUT_CONSTEXPR Color
operator()(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, Intersection const& inter, Renderer const& renderer,
std::size_t depth_max, Refractions const& refracs
) const
{
typedef typename std::decay<
decltype(sprout::darkroom::materials::reflection(sprout::darkroom::intersects::material(inter)))
>::type reflection_type;
return depth_max > 0
&& sprout::darkroom::intersects::does_intersect(inter)
&& sprout::darkroom::materials::reflection(sprout::darkroom::intersects::material(inter))
> sprout::numeric_limits<reflection_type>::epsilon()
? color_1<Color>(
camera, objs, lights,
ray, inter, renderer,
depth_max, refracs,
sprout::darkroom::coords::reflect(
sprout::darkroom::rays::direction(ray),
sprout::darkroom::intersects::normal(inter)
)
)
: sprout::tuples::make<Color>(0, 0, 0)
;
}
};
//
// whitted_transmit
//
class whitted_transmit {
private:
template<
typename Color,
typename Camera, typename Objects, typename Lights,
typename Ray, typename Refractions, typename Intersection, typename Renderer,
typename Direction
>
SPROUT_CONSTEXPR sprout::pair<Color, bool>
color_1(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, Intersection const& inter, Renderer const& renderer,
std::size_t depth_max, Refractions const& refracs,
Direction const& new_dir
) const
{
return sprout::darkroom::coords::is_zero(new_dir) ? sprout::pair<Color, bool>(sprout::tuples::make<Color>(0, 0, 0), true)
: sprout::darkroom::intersects::is_from_inside(inter) ? sprout::pair<Color, bool>(
sprout::darkroom::renderers::calculate<Color>(
renderer,
camera, objs, lights,
sprout::tuples::remake<Ray>(
ray,
sprout::darkroom::rays::detach_position(sprout::darkroom::intersects::point_of_intersection(inter), new_dir),
new_dir
),
depth_max - 1,
sprout::tuples::remake<Refractions>(refracs, 1.0)
//sprout::tuples::pop_back(refracs)
),
false
)
: sprout::pair<Color, bool>(
sprout::darkroom::renderers::calculate<Color>(
renderer,
camera, objs, lights,
sprout::tuples::remake<Ray>(
ray,
sprout::darkroom::rays::detach_position(sprout::darkroom::intersects::point_of_intersection(inter), new_dir),
new_dir
),
depth_max - 1,
sprout::tuples::remake<Refractions>(refracs, sprout::darkroom::materials::refraction(sprout::darkroom::intersects::material(inter)))
//sprout::tuples::push_back(refracs, sprout::darkroom::materials::refraction(sprout::darkroom::intersects::material(inter)))
),
false
)
;
}
public:
template<
typename Color,
typename Camera, typename Objects, typename Lights,
typename Ray, typename Refractions, typename Intersection, typename Renderer
>
SPROUT_CONSTEXPR sprout::pair<Color, bool>
operator()(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, Intersection const& inter, Renderer const& renderer,
std::size_t depth_max, Refractions const& refracs
) const
{
typedef typename std::decay<
decltype(sprout::darkroom::materials::alpha(sprout::darkroom::intersects::material(inter)))
>::type alpha_type;
typedef typename std::decay<
decltype(sprout::darkroom::materials::refraction(sprout::darkroom::intersects::material(inter)))
>::type refraction_type;
return depth_max > 0
&& sprout::darkroom::intersects::does_intersect(inter)
&& sprout::darkroom::materials::alpha(sprout::darkroom::intersects::material(inter))
> sprout::numeric_limits<alpha_type>::epsilon()
&& sprout::darkroom::materials::refraction(sprout::darkroom::intersects::material(inter))
> sprout::numeric_limits<refraction_type>::epsilon()
? color_1<Color>(
camera, objs, lights,
ray, inter, renderer,
depth_max, refracs,
sprout::darkroom::coords::refract(
sprout::darkroom::rays::direction(ray),
sprout::darkroom::intersects::normal(inter),
sprout::darkroom::intersects::is_from_inside(inter)
? sprout::tuples::get<sprout::tuples::tuple_size<Refractions>::value - 1>(refracs)
/ sprout::darkroom::materials::refraction(sprout::darkroom::intersects::material(inter))
: sprout::darkroom::materials::refraction(sprout::darkroom::intersects::material(inter))
/ sprout::tuples::get<sprout::tuples::tuple_size<Refractions>::value - 1>(refracs)
)
)
: sprout::pair<Color, bool>(sprout::tuples::make<Color>(0, 0, 0), false)
;
}
};
//
// whitted_style
//
template<typename InfinityColor = sprout::darkroom::renderers::direction_gradation>
class whitted_style {
public:
typedef InfinityColor infinity_color_type;
private:
infinity_color_type infinity_color_;
private:
template<typename Color, typename Ray, typename Intersection, typename DiffuseColor, typename MirrorColor, typename TransparentColors>
SPROUT_CONSTEXPR Color
color_3(
Ray const& ray, Intersection const& inter,
DiffuseColor const& diffuse_color, MirrorColor const& mirror_color, TransparentColors const& transmit_colors
) const
{
return sprout::darkroom::intersects::does_intersect(inter)
? sprout::darkroom::colors::add(
sprout::darkroom::colors::mul(
diffuse_color,
1
- sprout::darkroom::materials::reflection(sprout::darkroom::intersects::material(inter))
- sprout::darkroom::materials::alpha(sprout::darkroom::intersects::material(inter))
),
sprout::darkroom::colors::mul(
mirror_color,
!transmit_colors.second
? sprout::darkroom::materials::reflection(sprout::darkroom::intersects::material(inter))
: sprout::darkroom::materials::reflection(sprout::darkroom::intersects::material(inter))
+ sprout::darkroom::materials::alpha(sprout::darkroom::intersects::material(inter))
),
sprout::darkroom::colors::mul(
transmit_colors.first,
!transmit_colors.second
? sprout::darkroom::materials::alpha(sprout::darkroom::intersects::material(inter))
: 0
)
)
: sprout::darkroom::renderers::calculate_infinity<Color>(infinity_color_, sprout::darkroom::rays::direction(ray))
;
}
template<
typename Color,
typename Camera, typename Objects, typename Lights,
typename Ray, typename Refractions, typename Intersection
>
SPROUT_CONSTEXPR Color
color_2(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, std::size_t depth_max, Refractions const& refracs, Intersection const& inter,
Color const& diffuse_color
) const
{
return color_3<Color>(
ray, inter,
diffuse_color,
sprout::darkroom::renderers::whitted_mirror().template operator()<Color>(
camera, objs, lights,
ray, inter, *this,
depth_max, refracs
),
sprout::darkroom::renderers::whitted_transmit().template operator()<Color>(
camera, objs, lights,
ray, inter, *this,
depth_max, refracs
)
);
}
template<
typename Color,
typename Camera, typename Objects, typename Lights,
typename Ray, typename Refractions, typename Intersection
>
SPROUT_CONSTEXPR Color
color_1(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, std::size_t depth_max, Refractions const& refracs, Intersection const& inter
) const
{
return color_2<Color>(
camera, objs, lights,
ray, depth_max, refracs, inter,
sprout::darkroom::lights::calculate(lights, inter, objs)
);
}
public:
SPROUT_CONSTEXPR whitted_style()
: infinity_color_()
{}
whitted_style(whitted_style const&) = default;
explicit SPROUT_CONSTEXPR whitted_style(infinity_color_type const& infinity_color)
: infinity_color_(infinity_color)
{}
template<
typename Color, typename Camera, typename Objects, typename Lights, typename Ray, typename Refractions,
typename sprout::enabler_if<sprout::tuples::is_tuple<Refractions>::value>::type = sprout::enabler
>
SPROUT_CONSTEXPR Color
operator()(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, std::size_t depth_max, Refractions const& refracs
) const
{
return color_1<Color>(
camera, objs, lights,
ray, depth_max, refracs,
sprout::darkroom::objects::intersect(objs, ray)
);
}
template<
typename Color, typename Camera, typename Objects, typename Lights, typename Ray, typename Refractions,
typename sprout::enabler_if<!sprout::tuples::is_tuple<Refractions>::value>::type = sprout::enabler
>
SPROUT_CONSTEXPR Color
operator()(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, std::size_t depth_max, Refractions const& refracs
) const
{
return operator()<Color>(
camera, objs, lights,
ray, depth_max, sprout::tuples::make_tuple(refracs)
);
}
template<typename Color, typename Camera, typename Objects, typename Lights, typename Ray>
SPROUT_CONSTEXPR Color
operator()(
Camera const& camera, Objects const& objs, Lights const& lights,
Ray const& ray, std::size_t depth_max
) const
{
return operator()<Color>(
camera, objs, lights,
ray, depth_max, sprout::tuples::make_tuple(1.0)
);
}
};
//
// make_whitted_style
//
inline SPROUT_CONSTEXPR sprout::darkroom::renderers::whitted_style<>
make_whitted_style() {
return sprout::darkroom::renderers::whitted_style<>();
}
template<typename InfinityColor>
inline SPROUT_CONSTEXPR sprout::darkroom::renderers::whitted_style<InfinityColor>
make_whitted_style(InfinityColor const& infinity_color) {
return sprout::darkroom::renderers::whitted_style<InfinityColor>(infinity_color);
}
} // namespace renderers
} // namespace darkroom
} // namespace sprout
#endif // #ifndef SPROUT_DARKROOM_RENDERERS_WHITTED_STYLE_HPP
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