texture manager, going to pull out into a resource manager

src/engine/engine.hpp

@@ -9,14 +9,18 @@
 #include "game/game.hpp"
 #include "rendering/renderer.hpp"
 static const bool SHOW_FPS = true;
+static const std::string RESOURCE_DIR = "assets";
 class Engine {
 public:
     Engine(std::unique_ptr<Game> game, std::unique_ptr<Renderer> renderer);
     void start_loop();
     std::chrono::time_point<std::chrono::system_clock> render_fps(std::chrono::time_point<std::chrono::system_clock> end, std::chrono::time_point<std::chrono::system_clock> lastframe);
+
+    virtual ~Engine();
+
 private:
-    std::unique_ptr<Game> game;
-    std::unique_ptr<Renderer> renderer;
+    std::unique_ptr<Game> game = nullptr;
+    std::unique_ptr<Renderer> renderer = nullptr;
 };