Added missing files

src/frontend/screens.h

@@ -0,0 +1,38 @@
+#ifndef FRONTEND_SCREENS_H_
+#define FRONTEND_SCREENS_H_
+
+#include "../settings.h"
+
+class Assets;
+class Level;
+class WorldRenderer;
+class HudRenderer;
+class Engine;
+
+
+/* Screen is a mainloop state */
+class Screen {
+protected:
+    Engine* engine;
+public:
+    Screen(Engine* engine) : engine(engine) {};
+    virtual ~Screen() {};
+    virtual void update(float delta) = 0;
+    virtual void draw(float delta) = 0;
+};
+
+class LevelScreen : public Screen {
+    Level* level;
+    WorldRenderer* worldRenderer;
+    HudRenderer* hud;
+    bool occlusion;
+    void updateHotkeys();
+public:
+    LevelScreen(Engine* engine, Level* level);
+    ~LevelScreen();
+
+    void update(float delta) override;
+    void draw(float delta) override;
+};
+
+#endif // FRONTEND_SCREENS_H_