Add context sharing on prefabs.

src/dawn/asset/loader/LoaderForSceneItems.cpp

@@ -35,7 +35,9 @@ void LoaderForSceneItems::setupDependencies() {
         loader = getAssetManager()->get<JSONLoader>(path);
 
       } else if(type == "prefab") {
-        loader = getAssetManager()->get<PrefabLoader>(path);
+        auto prefabLoader = getAssetManager()->get<PrefabLoader>(path);
+        prefabLoader->parentLoader = weak_from_this();
+        loader = prefabLoader;
 
       } else {
         assertUnreachable("Unknown asset type: %s", type.c_str());

src/dawn/asset/loader/LoaderForSceneItems.hpp

@@ -8,10 +8,14 @@
 #include "scene/Scene.hpp"
 
 namespace Dawn {
-  class LoaderForSceneItems : public AssetLoader {
+  class LoaderForSceneitems;
+
+  class LoaderForSceneItems :
+    public AssetLoader,
+    public std::enable_shared_from_this<LoaderForSceneItems>
+  {
     protected:
       std::shared_ptr<JSONLoader> jsonLoader;
-      struct SceneComponentLoadContext ctx;
 
       /**
        * Loads the dependencies into the context for the data available in
@@ -20,6 +24,8 @@ namespace Dawn {
       void setupDependencies();
 
     public:
+      struct SceneComponentLoadContext ctx;
+
       LoaderForSceneItems(
         const std::shared_ptr<AssetManager> assetManager,
         const std::string name

src/dawn/asset/loader/PrefabLoader.cpp

@@ -4,6 +4,7 @@
 // https://opensource.org/licenses/MIT
 
 #include "PrefabLoader.hpp"
+#include "SceneLoader.hpp"
 #include "game/Game.hpp"
 #include "assert/assert.hpp"
 #include "asset/loader/TextureLoader.hpp"
@@ -64,6 +65,11 @@ std::string PrefabLoader::getAssetType() const {
 void PrefabLoader::stagePrefab(std::shared_ptr<SceneItem> item) {
   assertTrue(this->loaded, "Prefab not loaded");
 
+  // Can we merge with the parent context?
+  auto parentLoaderLock = this->parentLoader.lock();
+  if(parentLoaderLock) this->ctx.merge(parentLoaderLock->ctx);
+
+  // Force-set new context values
   ctx.scene = item->getScene();
   ctx.data = this->jsonLoader->data;
 

src/dawn/asset/loader/PrefabLoader.hpp

@@ -8,6 +8,7 @@
 #include "scene/Scene.hpp"
 
 namespace Dawn {
+  
   enum class PrefabLoaderState {
     INITIAL,
     LOADING_JSON,
@@ -23,6 +24,7 @@ namespace Dawn {
 
     public:
       const static std::string ASSET_TYPE;
+      std::weak_ptr<LoaderForSceneItems> parentLoader;
 
       PrefabLoader(
         const std::shared_ptr<AssetManager> assetManager,