Game stage stub

src/client/client.c

@@ -36,7 +36,7 @@ static World *test_world;
 World *
 _make_test_World ()
 {
-  World *self = World_load_from_path ("res/test_map_2.png");
+  World *self = World_load_from_path ("res/test_map.png");
 
   /* TODO: add players and so on. That will be in GameState,
      though. Or GameData. */

src/client/game_stage.h

@@ -0,0 +1,55 @@
+/*
+
+  LibreFront --- an OpenFront clone
+  Copyright (C) 2025  Adrien Jaguenet
+  Copyright (C) 2025  Emil Kosz
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Affero General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU Affero General Public License for more details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+*/
+
+/*
+
+  A GameStage is basically like a scene in traditional ECS-style game
+  engines.
+
+*/
+
+/* https://www.studyplan.dev/sdl2/sdl2-user-events */
+
+#pragma once
+
+#include <glib-2.0/glib.h>
+
+#include <client/gfx_context.h>
+
+typedef struct EventHandler
+{
+  int priority;
+  
+  void *callback_data;
+  gboolean (*callback) (SDL_Event *, void *);
+} EventHandler;
+
+typedef struct GameStage
+{
+  GList *event_handlers;
+  void *data;
+  
+  void (*on_enter) (struct GameStage *);
+  void (*on_update) (struct GameStage *);
+  void (*on_render) (struct GameStage *, GfxContext *);
+  void (*on_exit) (struct GameStage *);
+  void (*free) (struct GameStage *);
+} GameStage;