[ADDED] simple collision logic for entities

src/collision/collision.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <glm/gtc/matrix_transform.hpp>
+#include "../entities/entity.h"
+
+namespace collision
+{
+	/*
+	 * This structure represents a collision box inside the world.
+	 *
+	 * center_pos:	The center position of the collision box
+	 * size:		The size in each axis of the collision box
+	 */
+	struct Box
+	{
+		glm::vec3 center_pos;
+		glm::vec3 size;
+	};
+
+	/*
+	 * This structure represents a collision between 2 entities
+	 *
+	 * entity1:		The first entity
+	 * entity2:		The second entity
+	 */
+	struct Collision
+	{
+		entities::Entity& entity1;
+		entities::Entity& entity2;
+	};
+}