scenes: infraestructura de la capa scenes:: (scene, timeline, sprite mover, frame animator, palette fade, surface handle, registry)

source/scenes/scene_registry.cpp

@@ -0,0 +1,20 @@
+#include "scenes/scene_registry.hpp"
+
+namespace scenes {
+
+SceneRegistry& SceneRegistry::instance() {
+    static SceneRegistry inst;
+    return inst;
+}
+
+void SceneRegistry::registerScene(int state_key, Factory factory) {
+    factories_[state_key] = std::move(factory);
+}
+
+std::unique_ptr<Scene> SceneRegistry::tryCreate(int state_key) const {
+    const auto it = factories_.find(state_key);
+    if (it == factories_.end()) return nullptr;
+    return it->second();
+}
+
+}  // namespace scenes