add event loop

sdl_opengl_bare.d

@@ -24,6 +24,18 @@ int main(char[][] args)
         return 2;
     }
 
+    SDL_Event event;
+    while (SDL_WaitEvent(&event))
+    {
+        if (event.type == SDL_QUIT)
+            break;
+        else if (event.type == SDL_KEYDOWN)
+        {
+            if (event.key.keysym.sym == SDLK_ESCAPE)
+                break;
+        }
+    }
+
     SDL_Quit();
 
     return 0;