feat: engine class impl + IApplication interface

include/window/event.h

@@ -3,11 +3,12 @@
 
 #include <functional>
 #include <algorithm>
+#include <typeindex>
 #include <unordered_map>
 #include <vector>
 #include <typeindex>
 
-class EventBus {
+class EventDispatcher {
     using Type = std::type_index;
     using RawFn = std::function<void(const void*)>;
 
@@ -24,7 +25,7 @@ public:
     };
 
     template<class E, class F>
-    Handle subscribe(F&& f) {
+    Handle Subscribe(F&& f) {
         auto& vec = subs_[Type(typeid(E))];
         Handle h{ Type(typeid(E)), next_id_++ };
         // Wrap strongly typed callback into type-erased RawFn
@@ -36,7 +37,7 @@ public:
     }
 
     // Unsubscribe with handle
-    void unsubscribe(const Handle& h) {
+    void Unsubscribe(const Handle& h) {
         auto it = subs_.find(h.type);
         if (it == subs_.end()) return;
         auto& vec = it->second;
@@ -47,26 +48,11 @@ public:
 
     // Publish immediately
     template<class E>
-    void publish(const E& e) const {
+    void Dispatch(const E& e) const {
         auto it = subs_.find(Type(typeid(E)));
         if (it == subs_.end()) return;
         for (auto& slot : it->second) slot.fn(&e);
     }
 };
 
-// Optional RAII helper
-struct ScopedSub {
-    EventBus* bus{};
-    EventBus::Handle h{};
-    ScopedSub() = default;
-    ScopedSub(EventBus& b, EventBus::Handle hh) : bus(&b), h(hh) {}
-    ScopedSub(ScopedSub&& o) noexcept { *this = std::move(o); }
-    ScopedSub& operator=(ScopedSub&& o) noexcept {
-        if (this != &o) { reset(); bus = o.bus; h = o.h; o.bus = nullptr; }
-        return *this;
-    }
-    ~ScopedSub(){ reset(); }
-    void reset(){ if (bus && h) bus->unsubscribe(h); bus=nullptr; h={}; }
-};
-
 #endif // EVENT_H_

include/window/window.h

@@ -1,8 +1,9 @@
 #ifndef WINDOW_H_
 #define WINDOW_H_
 #include <SDL3/SDL.h>
+#include <memory>
 
-#include "event.hpp"
+#include "event.h"
 
 #define ENGINE_GL_MAJOR_VERSION 4
 #define ENGINE_GL_MINOR_VERSION 6
@@ -12,35 +13,39 @@
 #define DEFAULT_WIDTH 1024
 #define DEFAULT_HEIGHT 768
 
-class Window : public EventBus {
+class Window : public EventDispatcher {
+    friend class Engine;
 private:
-    SDL_Window *m_handle;
-    SDL_GLContext m_context;
-
-    int m_width;
-    int m_height;
-
-    bool m_is_open;
-public:
     Window();
     Window(const char* title, int width, int height);
     ~Window();
 
+    struct WindowDeleter {
+        void operator()(Window* w) const { delete w; };
+    };
+public:
+    static std::shared_ptr<Window> GetInstance();
+
     Window(Window&& window) noexcept;
     Window& operator=(Window&& window) noexcept;
 
     Window(const Window& window) noexcept = delete;
     Window& operator=(const Window& window) noexcept = delete;
 public:
-    [[nodiscard]] inline int GetWidth() const { return m_width; }
-    [[nodiscard]] inline int GetHeight() const { return m_height; }
-    [[nodiscard]] inline bool IsOpen() const { return m_is_open; }
-public:
+    [[nodiscard]] static inline int GetWidth() { return Window::GetInstance()->m_width; }
+    [[nodiscard]] static inline int GetHeight() { return Window::GetInstance()->m_height; }
+private:
     void ProcessEvents();
-public:
     void SwapBuffers() const;
-public:
     void Destroy() const;
+private:
+    static std::shared_ptr<Window> s_instance;
+    
+    SDL_Window *m_handle;
+    SDL_GLContext m_context;
+
+    int m_width;
+    int m_height;
 };
 
 #endif //WINDOW_H_