sphere/sphere intersection test

[gong.git] / src / geometry / primitive.hpp

diff --git a/src/geometry/primitive.hpp b/src/geometry/primitive.hpp
index 819ef04e77bd03e948b4c18fd051d817e610b69d..e785c635cc1ecf15e7b63225eb12f4b968e7194f 100644 (file)
--- a/src/geometry/primitive.hpp
+++ b/src/geometry/primitive.hpp
@@ -30,10 +30,22 @@ struct AABB {
                glm::vec3 high(glm::max(glm::abs(min), glm::abs(max)));
                return glm::length(high);
        }
+
+       void Position(const glm::vec3 &center) noexcept {
+               const glm::vec3 halfsize((max - min) * 0.5f);
+               min = center - halfsize;
+               max = center + halfsize;
+       }
+       void Move(const glm::vec3 &delta) noexcept {
+               min += delta;
+               max += delta;
+       }
 };
 
 std::ostream &operator <<(std::ostream &, const AABB &);
 
+bool Intersection(const AABB &, const AABB &) noexcept;
+
 // TODO: this should really use setters/getters for dir and inv_dir so
 //       manipulating code doesn't "forget" to call Update()
 struct Ray {
@@ -163,12 +175,28 @@ bool CullTest(const AABB &box, const glm::mat4 &) noexcept;
 bool CullTest(const AABB &box, const Frustum &) noexcept;
 
 struct Sphere {
+
        glm::vec3 origin;
        float radius;
+
+       void Position(const glm::vec3 &center) noexcept {
+               origin = center;
+       }
+       void Move(const glm::vec3 &delta) noexcept {
+               origin += delta;
+       }
+
 };
 
 std::ostream &operator <<(std::ostream &, const Sphere &);
 
+/// Two spheres intersection test.
+bool Intersection(
+       const Sphere &,
+       const Sphere &,
+       float &dist,
+       glm::vec3 &norm) noexcept;
+
 /// Test for intersection of sphere with double sided infinite plane.
 /// If true, dist will hold the smaller interpenetration depth and norm
 /// the respective contact normal.