Pixels, Surfaces, Renderer, oh my...

include/hdk/sdl/main.hpp

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+#pragma once
+#define SDL_MAIN_USE_CALLBACKS 1
+#include <SDL3/SDL_main.h>
+#include <hdk/sdl/Application.hpp>
+
+/// @macro HDK_SDL_MAIN_CLASS(klass)
+/// @brief Define the SDL main entry point using a class implementing hdk::sdl::ApplicationInterface.
+/// @param klass Class name of the application implementation. Must implement hdk::sdl::ApplicationInterface with Init,
+/// Event, Iterate, and Quit methods.
+/// @details This macro generates the SDL main entry point functions (SDL_AppInit, SDL_AppEvent, SDL_AppIterate,
+/// SDL_AppQuit) that create an instance of the specified class and delegate to its methods. This allows users to write
+/// their application logic in a clean class structure while still integrating with SDL's application lifecycle. The
+/// generated main functions handle the boilerplate of managing the application instance and connecting it to SDL's
+/// event loop and lifecycle callbacks.
+
+#define HDK_SDL_MAIN_CLASS(klass)                                                                                      \
+  SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[]) {                                                 \
+    klass* app = new klass();                                                                                          \
+    *appstate = app;                                                                                                   \
+    return app->Init(argc, argv);                                                                                      \
+  }                                                                                                                    \
+  SDL_AppResult SDL_AppEvent(void* appstate, SDL_Event* event) {                                                       \
+    klass* app = static_cast<klass*>(appstate);                                                                        \
+    return app->Event(event);                                                                                          \
+  }                                                                                                                    \
+  SDL_AppResult SDL_AppIterate(void* appstate) {                                                                       \
+    klass* app = static_cast<klass*>(appstate);                                                                        \
+    return app->Iterate();                                                                                             \
+  }                                                                                                                    \
+  void SDL_AppQuit(void* appstate, SDL_AppResult result) {                                                             \
+    klass* app = static_cast<klass*>(appstate);                                                                        \
+    app->Quit(result);                                                                                                 \
+    delete app;                                                                                                        \
+  }
+
+// end of file