Fix issues with model data storage when doing long actions in async (eg. SDF generation)

Source/Editor/Tools/Terrain/TerrainTools.cpp

@@ -74,11 +74,6 @@ struct TextureDataResult
     PixelFormat Format;
     Int2 Mip0Size;
     BytesContainer* Mip0DataPtr;
-
-    TextureDataResult()
-        : Lock(FlaxStorage::LockData::Invalid)
-    {
-    }
 };
 
 bool GetTextureDataForSampling(Texture* texture, TextureDataResult& data, bool hdr = false)

Source/Engine/Content/Assets/Model.cpp

@@ -262,6 +262,7 @@ bool Model::GenerateSDF(float resolutionScale, int32 lodIndex, bool cacheData, f
         LOG(Warning, "Cannot generate SDF for virtual models on a main thread.");
         return true;
     }
+    auto chunkLocks = Storage ? Storage->Lock() : FlaxStorage::LockData();
     lodIndex = Math::Clamp(lodIndex, HighestResidentLODIndex(), LODs.Count() - 1);
 
     // Generate SDF

Source/Engine/Content/Assets/ModelBase.cpp

@@ -61,7 +61,7 @@ public:
         model->GetLODData(_lodIndex, data);
         if (data.IsInvalid())
         {
-            LOG(Warning, "Missing data chunk");
+            LOG(Warning, "Missing data chunk with LOD{} for model '{}'", _lodIndex, model->ToString());
             return true;
         }
         MemoryReadStream stream(data.Get(), data.Length());
@@ -234,6 +234,7 @@ bool ModelBase::Save(bool withMeshDataFromGpu, const StringView& path)
         LOG(Error, "To save virtual model asset you need to specify 'withMeshDataFromGpu' (it has no other storage container to get data).");
         return true;
     }
+    auto chunkLocks = Storage ? Storage->Lock() : FlaxStorage::LockData();
     ScopeLock lock(Locker);
 
     // Use a temporary chunks for data storage for virtual assets

Source/Engine/Content/Storage/FlaxStorage.cpp

@@ -75,8 +75,6 @@ FlaxChunk* FlaxChunk::Clone() const
 
 const int32 FlaxStorage::MagicCode = 1180124739;
 
-FlaxStorage::LockData FlaxStorage::LockData::Invalid(nullptr);
-
 struct Header
 {
     int32 MagicCode;

Source/Engine/Content/Storage/FlaxStorage.h

@@ -146,7 +146,6 @@ public:
     struct LockData
     {
         friend FlaxStorage;
-        static LockData Invalid;
 
     private:
         FlaxStorage* _storage;
@@ -159,6 +158,11 @@ public:
         }
 
     public:
+        LockData()
+            : _storage(nullptr)
+        {
+        }
+
         LockData(const LockData& other)
             : _storage(other._storage)
         {

Source/Engine/Graphics/Textures/TextureBase.cpp

@@ -771,7 +771,7 @@ Task* TextureBase::RequestMipDataAsync(int32 mipIndex)
 
 FlaxStorage::LockData TextureBase::LockData()
 {
-    return _parent->Storage ? _parent->Storage->Lock() : FlaxStorage::LockData::Invalid;
+    return _parent->Storage ? _parent->Storage->Lock() : FlaxStorage::LockData();
 }
 
 void TextureBase::GetMipData(int32 mipIndex, BytesContainer& data) const