Rewrite of main function to use SDL3 app main callbacks

src/main.cc

@@ -1,19 +1,62 @@
-#include "vulkanapp.hh"
+#define SDL_MAIN_USE_CALLBACKS
+#include <SDL3/SDL_main.h>
+#include <SDL3/SDL_init.h>
+#include <SDL3/SDL.h>
 
-#include <exception>
+constexpr uint32_t winInitWidth = 512;
+constexpr uint32_t winInitHeight = 512;
 
-int main() {
-    VulkanApp app(1024, 1024);
+struct AppContext {
+    SDL_Window *window;
+    SDL_AppResult appQuit = SDL_APP_CONTINUE;
+};
 
-    try {
-        app.init();
-        app.loop();
-        app.cleanup();
-    } catch(const std::exception& except) {
-        fprintf(stderr, "Error! %s\n", except.what());
+SDL_AppResult SDL_Fail() {
+    SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Error: %s", SDL_GetError());
+    return SDL_APP_FAILURE;
+}
 
-        return 1;
+SDL_AppResult SDL_AppInit(void **appstate, int argc, char **argv) {
+    if(!SDL_Init(SDL_INIT_VIDEO))
+        return SDL_Fail();
+
+    SDL_Window *win = SDL_CreateWindow("SDL3 Vulkan", winInitWidth, winInitHeight, SDL_WINDOW_RESIZABLE | SDL_WINDOW_VULKAN);
+
+    if(!win)
+        return SDL_Fail();
+
+    *appstate = new AppContext {
+        .window = win,
+    };
+
+    return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) {
+    AppContext* app = static_cast<AppContext*>(appstate);
+
+    switch(event->type) {
+        case SDL_EVENT_QUIT:
+            app->appQuit = SDL_APP_SUCCESS;
     }
 
-    return 0;
-}
+    return SDL_APP_CONTINUE;
+}
+
+SDL_AppResult SDL_AppIterate(void *appstate) {
+    AppContext* app = static_cast<AppContext*>(appstate);
+
+    return app->appQuit;
+}
+
+void SDL_AppQuit(void *appstate, SDL_AppResult result) {
+    AppContext* app = static_cast<AppContext*>(appstate);
+
+    if(app) {
+        SDL_DestroyWindow(app->window);
+
+        delete app;
+    }
+
+    SDL_Quit();
+}