split geometry lib

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

diff --git a/src/geometry/primitive.hpp b/src/geometry/primitive.hpp
new file mode 100644 (file)
index 0000000..351a3a4
--- /dev/null
+++ b/src/geometry/primitive.hpp
@@ -0,0 +1,49 @@
+#ifndef BLANK_GEOMETRY_PRIMITIVE_HPP_
+#define BLANK_GEOMETRY_PRIMITIVE_HPP_
+
+#include <algorithm>
+#include <glm/glm.hpp>
+
+
+namespace blank {
+
+struct AABB {
+       glm::vec3 min;
+       glm::vec3 max;
+
+       void Adjust() noexcept {
+               if (max.x < min.x) std::swap(max.x, min.x);
+               if (max.y < min.y) std::swap(max.y, min.y);
+               if (max.z < min.z) std::swap(max.z, min.z);
+       }
+
+       glm::vec3 Center() const noexcept {
+               return min + (max - min) * 0.5f;
+       }
+};
+
+struct Ray {
+       glm::vec3 orig;
+       glm::vec3 dir;
+};
+
+bool Intersection(
+       const Ray &,
+       const AABB &,
+       const glm::mat4 &M,
+       float *dist = nullptr,
+       glm::vec3 *normal = nullptr) noexcept;
+
+bool Intersection(
+       const AABB &a_box,
+       const glm::mat4 &a_m,
+       const AABB &b_box,
+       const glm::mat4 &b_m,
+       float &depth,
+       glm::vec3 &normal) noexcept;
+
+bool CullTest(const AABB &box, const glm::mat4 &MVP) noexcept;
+
+}
+
+#endif