ja tenim el control de la finestra i de la imatge

treballant en les tecles de funcio

source/core/screen.hpp

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <SDL3/SDL.h>
+
+#include <cstdint>
+
+class Screen {
+   public:
+    static void init();
+    static void destroy();
+    static auto get() -> Screen*;
+
+    // Presentació — rep el buffer ARGB de 320x200 de JD8
+    void present(const Uint32* pixel_data);
+
+    // Gestió de finestra
+    void toggleFullscreen();
+    void incZoom();
+    void decZoom();
+    void setZoom(int zoom);
+
+    // Getters
+    [[nodiscard]] auto isFullscreen() const -> bool { return fullscreen_; }
+    [[nodiscard]] auto getZoom() const -> int { return zoom_; }
+    [[nodiscard]] auto getWindow() -> SDL_Window* { return window_; }
+    [[nodiscard]] auto getRenderer() -> SDL_Renderer* { return renderer_; }
+
+   private:
+    Screen();
+    ~Screen();
+
+    void adjustWindowSize();
+    void calculateMaxZoom();
+
+    static Screen* instance_;
+
+    SDL_Window* window_{nullptr};
+    SDL_Renderer* renderer_{nullptr};
+    SDL_Texture* texture_{nullptr};  // 320x200 streaming, ARGB8888
+
+    int zoom_{3};
+    int max_zoom_{6};
+    bool fullscreen_{false};
+
+    static constexpr int GAME_WIDTH = 320;
+    static constexpr int GAME_HEIGHT = 200;
+};