make tile unload safer

src/noggit/Action.cpp

@@ -78,7 +78,7 @@ void Noggit::Action::undo(bool redo)
       if (pair.second.tmp_edit_values)
         texture_set->getTempAlphamaps() = std::make_unique<tmp_edit_alpha_values>(*pair.second.tmp_edit_values);
       else
-        texture_set->getTempAlphamaps() = nullptr;
+        texture_set->getTempAlphamaps().reset();
 
       std::memcpy(texture_set->getMCLYEntries(), &pair.second.layers_info, sizeof(layer_info) * 4);
       texture_set->setNTextures(pair.second.n_textures);

src/noggit/MapTile.cpp

@@ -74,11 +74,15 @@ MapTile::MapTile( int pX
 
 MapTile::~MapTile()
 {
-  for (auto& pair : object_instances)
   {
-    for (auto& instance : pair.second)
+    std::lock_guard<std::mutex> const lock(_mutex);
+    
+    for (auto& pair : object_instances)
     {
-      instance->derefTile(this);
+      for (auto& instance : pair.second)
+      {
+        instance->derefTile(this);
+      }
     }
   }
 

src/noggit/SceneObject.cpp

@@ -15,6 +15,8 @@ SceneObject::SceneObject(SceneObjectTypes type, Noggit::NoggitRenderContext cont
 , _context(context)
 , pos(0.f, 0.f, 0.f)
 , dir(0.f, 0.f, 0.f)
+, uid(0)
+, frame(0)
 {
   // min and max initialized to their opposites
   extents[0] = glm::vec3(std::numeric_limits<float>::max()); 
@@ -86,6 +88,7 @@ void SceneObject::normalizeDirection()
 
 void SceneObject::refTile(MapTile* tile)
 {
+  assert(tile);
   auto it = std::find(_tiles.begin(), _tiles.end(), tile);
   if (it == _tiles.end())
     _tiles.push_back(tile);
@@ -93,6 +96,7 @@ void SceneObject::refTile(MapTile* tile)
 
 void SceneObject::derefTile(MapTile* tile)
 {
+  assert(tile);
   auto it = std::find(_tiles.begin(), _tiles.end(), tile);
   if (it != _tiles.end())
     _tiles.erase(it);

src/noggit/World.cpp

@@ -2039,7 +2039,7 @@ void World::remove_models_if_needed(std::vector<uint32_t> const& uids)
   /*
   if (uids.size())
   {
-    update_models_by_filename();
+    need_model_updates = true;
   }*/
 }