Refactor code into classes

src/game/game.cppm

@@ -0,0 +1,72 @@
+module;
+
+#include <memory>
+#include <SDL3/SDL.h>
+
+export module game.game;
+
+import core.engine;
+import core.renderer;
+import game.sprite;
+
+export namespace game
+{
+    class Game
+    {
+        core::Engine& engine_;
+
+        // Sprite for testing
+        std::unique_ptr<Sprite> sprite_ = nullptr;
+
+        public:
+            Game() = delete;
+
+            explicit Game(core::Engine& engine)
+                : engine_(engine)
+            {}
+
+            // No copy operations
+            Game(const Game&) = delete;
+            Game& operator=(const Game&) = delete;
+
+            // No move operations - TODO?
+            Game(Game&&) = delete;
+            Game& operator=(Game&&) = delete;
+
+            ~Game() = default;
+
+            void initialize()
+            {
+                sprite_ = std::make_unique<Sprite>(engine_.get_renderer(), "assets/neocat.png", 100, 100);
+            }
+
+            // Handles an SDL event. Returns true if the event has been handled.
+            bool handle_event(const SDL_Event* event) const
+            {
+                if (event->type == SDL_EVENT_MOUSE_MOTION) {
+                    sprite_->move(
+                        event->motion.x - 50,
+                        event->motion.y - 50
+                    );
+                    return true;
+                }
+                return false;
+            }
+
+            void update()
+            {
+            }
+
+            void render() const
+            {
+                const auto& renderer = engine_.get_renderer();
+                renderer.clear();
+                sprite_->draw(renderer);
+                renderer.present();
+            }
+
+            void shutdown()
+            {
+            }
+    };
+}