From a4c71d0e9f2a3db8125c603aa08e684e351ff8b7 Mon Sep 17 00:00:00 2001
From: bolero-MURAKAMI <bolero.murakami@gmail.com>
Date: Tue, 13 Dec 2011 04:01:10 +0900
Subject: [PATCH] =?UTF-8?q?sprout/darkroom/materials/material.hpp=20?=
 =?UTF-8?q?=E3=83=9E=E3=83=86=E3=83=AA=E3=82=A2=E3=83=AB=E3=81=AE=E4=BB=95?=
 =?UTF-8?q?=E6=A7=98=E5=A4=89=E6=9B=B4?=
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---
 sprout/darkroom/materials/material.hpp | 68 ++++++++++++++++++++------
 sprout/darkroom/objects/aa_plane.hpp   | 24 ++++++---
 sprout/darkroom/objects/sphere.hpp     | 55 ++++++++++++++++-----
 3 files changed, 114 insertions(+), 33 deletions(-)

diff --git a/sprout/darkroom/materials/material.hpp b/sprout/darkroom/materials/material.hpp
index 54d8455a..4ca44d0d 100644
--- a/sprout/darkroom/materials/material.hpp
+++ b/sprout/darkroom/materials/material.hpp
@@ -35,32 +35,32 @@ namespace sprout {
 			// calc_color
 			// calc_reflection
 			//
-			template<typename Image, typename Position, typename Normal>
-			SPROUT_CONSTEXPR auto calc_color(Image&& t, Position const&, Normal const&) SPROUT_NOEXCEPT
-				-> decltype(t)
+			template<typename Image, typename Unit>
+			SPROUT_CONSTEXPR auto calc_color(Image&& t, Unit const& u, Unit const& v) SPROUT_NOEXCEPT
+				-> decltype(sprout::forward<Image>(t).template operator()(u, v))
 			{
-				return t;
+				return sprout::forward<Image>(t).template operator()(u, v);
 			}
-			template<typename Image, typename Position, typename Normal>
-			SPROUT_CONSTEXPR auto calc_reflection(Image&& t, Position const&, Normal const&) SPROUT_NOEXCEPT
-				-> decltype(t)
+			template<typename Image, typename Unit>
+			SPROUT_CONSTEXPR auto calc_reflection(Image&& t, Unit const& u, Unit const& v) SPROUT_NOEXCEPT
+				-> decltype(sprout::forward<Image>(t).template operator()(u, v))
 			{
-				return t;
+				return sprout::forward<Image>(t).template operator()(u, v);
 			}
 
 			//
 			// calc_material
 			//
-			template<typename Material, typename Position, typename Normal>
-			SPROUT_CONSTEXPR auto calc_material(Material const& mat, Position const& pos, Normal const& nor)
+			template<typename Material, typename Unit>
+			SPROUT_CONSTEXPR auto calc_material(Material const& mat, Unit const& u, Unit const& v)
 				-> decltype(sprout::tuples::make_tuple(
-					sprout::darkroom::materials::calc_color(sprout::darkroom::materials::color(mat), pos, nor),
-					sprout::darkroom::materials::calc_reflection(sprout::darkroom::materials::reflection(mat), pos, nor)
+					sprout::darkroom::materials::calc_color(sprout::darkroom::materials::color(mat), u, v),
+					sprout::darkroom::materials::calc_reflection(sprout::darkroom::materials::reflection(mat), u, v)
 					))
 			{
 				return sprout::tuples::make_tuple(
-					sprout::darkroom::materials::calc_color(sprout::darkroom::materials::color(mat), pos, nor),
-					sprout::darkroom::materials::calc_reflection(sprout::darkroom::materials::reflection(mat), pos, nor)
+					sprout::darkroom::materials::calc_color(sprout::darkroom::materials::color(mat), u, v),
+					sprout::darkroom::materials::calc_reflection(sprout::darkroom::materials::reflection(mat), u, v)
 					);
 			}
 
@@ -77,6 +77,46 @@ namespace sprout {
 			// material
 			//
 			typedef sprout::tuples::tuple<sprout::darkroom::colors::rgb_f, double> material;
+
+			//
+			// uniform_element
+			//
+			template<typename Element>
+			class uniform_element {
+			public:
+				typedef Element result_type;
+			private:
+				result_type elem_;
+			public:
+				SPROUT_CONSTEXPR explicit uniform_element(result_type const& elem)
+					: elem_(elem)
+				{}
+				template<typename Unit>
+				SPROUT_CONSTEXPR result_type operator()(Unit const&, Unit const&) const {
+					return elem_;
+				}
+			};
+			//
+			// make_uniform
+			//
+			template<typename Element>
+			SPROUT_CONSTEXPR sprout::darkroom::materials::uniform_element<Element>
+			make_uniform(Element const& elem) {
+				return sprout::darkroom::materials::uniform_element<Element>(elem);
+			}
+			//
+			// make_uniform_material_image
+			//
+			template<typename Color, typename Reflection>
+			SPROUT_CONSTEXPR sprout::tuples::tuple<
+				sprout::darkroom::materials::uniform_element<Color>,
+				sprout::darkroom::materials::uniform_element<Reflection>
+			> make_uniform_material_image(Color const& col, Reflection const& ref) {
+				return sprout::tuples::make_tuple(
+					sprout::darkroom::materials::make_uniform(col),
+					sprout::darkroom::materials::make_uniform(ref)
+					);
+			}
 		}	// namespace materials
 	}	// namespace darkroom
 }	// namespace sprout
diff --git a/sprout/darkroom/objects/aa_plane.hpp b/sprout/darkroom/objects/aa_plane.hpp
index acabcf48..2281a097 100644
--- a/sprout/darkroom/objects/aa_plane.hpp
+++ b/sprout/darkroom/objects/aa_plane.hpp
@@ -44,8 +44,8 @@ namespace sprout {
 						position_type,
 						decltype(sprout::darkroom::materials::calc_material(
 							std::declval<material_type const&>(),
-							std::declval<position_type const&>(),
-							std::declval<position_type const&>()
+							std::declval<unit_type const&>(),
+							std::declval<unit_type const&>()
 							))
 					> type;
 				};
@@ -71,16 +71,27 @@ namespace sprout {
 					position_type const& normal
 					) const
 				{
+					using std::fmod;
 					return typename intersection<Ray>::type(
 						does_intersect,
 						distance,
 						point_of_intersection,
 						normal,
-						sprout::darkroom::materials::calc_material(
+						is_x() ? sprout::darkroom::materials::calc_material(	// ! Tile
 							mat_,
-							point_of_intersection,
-							normal
+							fmod(sprout::darkroom::coords::z(point_of_intersection), 0.5),
+							fmod(sprout::darkroom::coords::y(point_of_intersection), 0.5)
 							)
+							: is_y() ? sprout::darkroom::materials::calc_material(
+								mat_,
+								fmod(sprout::darkroom::coords::x(point_of_intersection), 0.5),
+								fmod(sprout::darkroom::coords::z(point_of_intersection), 0.5)
+								)
+							: sprout::darkroom::materials::calc_material(
+								mat_,
+								fmod(sprout::darkroom::coords::x(point_of_intersection), 0.5),
+								fmod(sprout::darkroom::coords::y(point_of_intersection), 0.5)
+								)
 						);
 				}
 				template<typename Ray>
@@ -95,10 +106,9 @@ namespace sprout {
 						does_intersect,
 						distance,
 						point_of_intersection,
-						(is_x() ? position_type(hit_side > 0 ? 1 : -1, 0, 0)
+						is_x() ? position_type(hit_side > 0 ? 1 : -1, 0, 0)
 							: is_y() ? position_type(0, hit_side > 0 ? 1 : -1, 0)
 							: position_type(0, 0, hit_side > 0 ? 1 : -1)
-							)
 						);
 				}
 				template<typename Ray>
diff --git a/sprout/darkroom/objects/sphere.hpp b/sprout/darkroom/objects/sphere.hpp
index 1022865c..db8d759f 100644
--- a/sprout/darkroom/objects/sphere.hpp
+++ b/sprout/darkroom/objects/sphere.hpp
@@ -35,8 +35,8 @@ namespace sprout {
 						position_type,
 						decltype(sprout::darkroom::materials::calc_material(
 							std::declval<material_type const&>(),
-							std::declval<position_type const&>(),
-							std::declval<position_type const&>()
+							std::declval<unit_type const&>(),
+							std::declval<unit_type const&>()
 							))
 					> type;
 				};
@@ -52,6 +52,8 @@ namespace sprout {
 					SPROUT_STATIC_CONSTEXPR std::size_t point_of_intersection = 0;
 					SPROUT_STATIC_CONSTEXPR std::size_t normal = 1;
 				};
+			private:
+				SPROUT_STATIC_CONSTEXPR unit_type pi = 3.1415926535897932384626433832795;
 			private:
 				position_type pos_;
 				radius_type rad_;
@@ -133,6 +135,40 @@ namespace sprout {
 							)
 						;
 				}
+				template<typename Ray, typename Point>
+				SPROUT_CONSTEXPR typename intersection<Ray>::type intersect_6(
+					Ray const& ray,
+					zwo_type const& zwo,
+					drei_type const& drei,
+					Point const& poi
+					) const
+				{
+					using std::atan2;
+					using std::sqrt;
+					return typename intersection<Ray>::type(
+						sprout::tuples::get<zw::does_intersect>(zwo),
+						sprout::tuples::get<zw::distance>(zwo),
+						sprout::tuples::get<dr::point_of_intersection>(drei),
+						sprout::tuples::get<dr::normal>(drei),
+						sprout::darkroom::materials::calc_material(	// ! Spherical
+							mat_,
+							atan2(
+								sprout::darkroom::coords::x(poi),
+								sprout::darkroom::coords::z(poi)
+								)
+								/ (2 * pi)
+								,
+							atan2(
+								sqrt(
+									sprout::darkroom::coords::x(poi) * sprout::darkroom::coords::x(poi)
+										+ sprout::darkroom::coords::y(poi) * sprout::darkroom::coords::y(poi)
+									),
+								sprout::darkroom::coords::z(poi)
+								)
+								/ (2 * pi)
+							)
+						);
+				}
 				template<typename Ray>
 				SPROUT_CONSTEXPR typename intersection<Ray>::type intersect_5(
 					Ray const& ray,
@@ -140,16 +176,11 @@ namespace sprout {
 					drei_type const& drei
 					) const
 				{
-					return typename intersection<Ray>::type(
-						sprout::tuples::get<zw::does_intersect>(zwo),
-						sprout::tuples::get<zw::distance>(zwo),
-						sprout::tuples::get<dr::point_of_intersection>(drei),
-						sprout::tuples::get<dr::normal>(drei),
-						sprout::darkroom::materials::calc_material(
-							mat_,
-							sprout::tuples::get<dr::point_of_intersection>(drei),
-							sprout::tuples::get<dr::normal>(drei)
-							)
+					return intersect_6(
+						ray,
+						zwo,
+						drei,
+						sprout::tuples::get<dr::point_of_intersection>(drei)
 						);
 				}
 				template<typename Ray>