Added AABB struct

src/maths/aabb.h

@@ -0,0 +1,31 @@
+#ifndef MATHS_AABB_H_
+#define MATHS_AABB_H_
+
+#include <glm/glm.hpp>
+
+// Axis Aligned Bounding Box
+struct AABB {
+	glm::vec3 a;
+    glm::vec3 b;
+
+    inline glm::vec3 min() const {
+        return glm::min(a, b);
+    }
+
+    inline glm::vec3 size() const {
+        return glm::vec3(
+            fabs(b.x - a.x),
+            fabs(b.y - a.y),
+            fabs(b.z - a.z)
+        );
+    }
+
+    inline bool inside(const glm::vec3 pos) const {
+        const glm::vec3 p = min();
+        const glm::vec3 s = size();
+        return !(pos.x < p.x || pos.y < p.y || 
+                 pos.x >= p.x+s.x || pos.y >= p.y+s.y);
+    }
+};
+
+#endif // MATHS_AABB_H_