From 60a3890c78e5a4e00a7948e8130954adae22b6be Mon Sep 17 00:00:00 2001
From: Benau <Benau@users.noreply.github.com>
Date: Fri, 1 Dec 2017 13:59:00 +0800
Subject: [PATCH] Add support for meta library objects

---
 src/tracks/track.cpp        | 9 +++++++++
 src/tracks/track.hpp        | 6 ++++++
 src/tracks/track_object.cpp | 6 ++++++
 3 files changed, 21 insertions(+)

diff --git a/src/tracks/track.cpp b/src/tracks/track.cpp
index f29266e26..ca3fabb63 100644
--- a/src/tracks/track.cpp
+++ b/src/tracks/track.cpp
@@ -466,6 +466,7 @@ void Track::cleanup()
     }
 #endif
 
+    m_meta_library.clear();
     Scripting::ScriptEngine::getInstance()->cleanupCache();
 
     m_current_track = NULL;
@@ -1757,6 +1758,14 @@ void Track::loadTrackModel(bool reverse_track, unsigned int mode_id)
 
     loadObjects(root, path, model_def_loader, true, NULL, NULL);
 
+    // Correct the parenting of meta library
+    for (auto& p : m_meta_library)
+    {
+        auto* ln = p.first->getPresentation<TrackObjectPresentationLibraryNode>();
+        assert(ln);
+        p.second->setParent(ln->getNode());
+    }
+
     model_def_loader.cleanLibraryNodesAfterLoad();
 
     Scripting::ScriptEngine::getInstance()->compileLoadedScripts();
diff --git a/src/tracks/track.hpp b/src/tracks/track.hpp
index a0d5a5adb..4a4603547 100644
--- a/src/tracks/track.hpp
+++ b/src/tracks/track.hpp
@@ -374,6 +374,8 @@ private:
     /** List of all bezier curves in the track - for e.g. camera, ... */
     std::vector<BezierCurve*> m_all_curves;
 
+    std::vector<std::pair<TrackObject*, scene::ISceneNode*> > m_meta_library;
+
     /** The number of laps the track will be raced in a random GP.
      * m_actual_number_of_laps is initialised with this value.*/
     int m_default_number_of_laps;
@@ -672,6 +674,10 @@ public:
     // ------------------------------------------------------------------------
     /** Adds mesh to cleanup list */
     void addCachedMesh(scene::IMesh* mesh) { m_all_cached_meshes.push_back(mesh); }
+    // ------------------------------------------------------------------------
+    /** Adds the parent of the meta library for correction later */
+    void addMetaLibrary(TrackObject* parent, scene::ISceneNode* meta_library)
+                         { m_meta_library.emplace_back(parent, meta_library); }
 };   // class Track
 
 #endif
diff --git a/src/tracks/track_object.cpp b/src/tracks/track_object.cpp
index 0d441d123..0e11cd069 100644
--- a/src/tracks/track_object.cpp
+++ b/src/tracks/track_object.cpp
@@ -31,6 +31,7 @@
 #include "physics/physical_object.hpp"
 #include "race/race_manager.hpp"
 #include "scriptengine/script_engine.hpp"
+#include "tracks/track.hpp"
 #include "tracks/model_definition_loader.hpp"
 
 #include <IAnimatedMeshSceneNode.h>
@@ -160,6 +161,11 @@ void TrackObject::init(const XMLNode &xml_node, scene::ISceneNode* parent,
     {
         xml_node.get("name", &m_name);
         m_presentation = new TrackObjectPresentationLibraryNode(this, xml_node, model_def_loader);
+        if (parent_library != NULL)
+        {
+            Track::getCurrentTrack()->addMetaLibrary(parent_library,
+                (dynamic_cast<TrackObjectPresentationLibraryNode*>(m_presentation))->getNode());
+        }
     }
     else if (type == "sfx-emitter")
     {