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- /*
- * Copyright (C) 2021 Christopher J. Howard
- *
- * This file is part of Antkeeper source code.
- *
- * Antkeeper source code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Antkeeper source code is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #ifndef ANTKEEPER_GEOM_INTERSECTION_HPP
- #define ANTKEEPER_GEOM_INTERSECTION_HPP
-
- #include "geom/aabb.hpp"
- #include "geom/mesh.hpp"
- #include "geom/plane.hpp"
- #include "geom/ray.hpp"
- #include "geom/sphere.hpp"
- #include "utility/fundamental-types.hpp"
- #include <tuple>
-
- namespace geom {
-
- /**
- * Tests for intersection between a ray and a plane.
- *
- * @param ray Ray to test for intersection.
- * @param plane Plane to test for intersection.
- * @return Tuple containing a boolean indicating whether intersection occurred, and a float indicating the signed distance along the ray to the point of intersection.
- */
- std::tuple<bool, float> ray_plane_intersection(const ray<float>& ray, const plane<float>& plane);
-
- std::tuple<bool, float, float, float> ray_triangle_intersection(const ray<float>& ray, const float3& a, const float3& b, const float3& c);
-
- std::tuple<bool, float, float> ray_aabb_intersection(const ray<float>& ray, const aabb<float>& aabb);
-
- std::tuple<bool, float, float, std::size_t, std::size_t> ray_mesh_intersection(const ray<float>& ray, const mesh& mesh);
-
- /**
- * Ray-sphere intersection test.
- */
- template <class T>
- std::tuple<bool, T, T> ray_sphere_intersection(const ray<T>& ray, const sphere<T>& sphere)
- {
- const auto d = ray.origin - sphere.center;
- const T b = math::dot(d, ray.direction);
- const T c = math::dot(d, d) - sphere.radius * sphere.radius;
- T h = b * b - c;
-
- if (h < T(0))
- return {false, T(0), T(0)};
-
- h = std::sqrt(h);
-
- return {true, -b - h, -b + h};
- }
-
- bool aabb_sphere_intersection(const aabb<float>& aabb, const float3& center, float radius);
-
- bool aabb_aabb_intersection(const aabb<float>& a, const aabb<float>& b);
-
- } // namespace geom
-
- #endif // ANTKEEPER_GEOM_INTERSECTION_HPP
-
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