Fix error when loading surface from not yet loaded asset

Source/Engine/Content/Asset.cpp

@@ -350,7 +350,7 @@ namespace ContentLoadingManagerImpl
     extern ConcurrentTaskQueue<ContentLoadTask> Tasks;
 };
 
-bool Asset::WaitForLoaded(double timeoutInMilliseconds)
+bool Asset::WaitForLoaded(double timeoutInMilliseconds) const
 {
     // This function is used many time when some parts of the engine need to wait for asset loading end (it may fail but has to end).
     // But it cannot be just a simple active-wait loop.
@@ -376,7 +376,7 @@ bool Asset::WaitForLoaded(double timeoutInMilliseconds)
         // If running on a main thread we can flush asset `Loaded` event
         if (IsInMainThread())
         {
-            Content::tryCallOnLoaded(this);
+            Content::tryCallOnLoaded((Asset*)this);
         }
 
         return false;
@@ -467,7 +467,7 @@ bool Asset::WaitForLoaded(double timeoutInMilliseconds)
     // If running on a main thread we can flush asset `Loaded` event
     if (IsInMainThread() && IsLoaded())
     {
-        Content::tryCallOnLoaded(this);
+        Content::tryCallOnLoaded((Asset*)this);
     }
 
     return _isLoaded == 0;

Source/Engine/Content/Asset.h

@@ -154,7 +154,7 @@ public:
     /// </summary>
     /// <param name="timeoutInMilliseconds">Custom timeout value in milliseconds.</param>
     /// <returns>True if cannot load that asset (failed or has been cancelled), otherwise false.</returns>
-    API_FUNCTION() bool WaitForLoaded(double timeoutInMilliseconds = 30000.0);
+    API_FUNCTION() bool WaitForLoaded(double timeoutInMilliseconds = 30000.0) const;
 
     /// <summary>
     /// Initializes asset data as virtual asset.

Source/Engine/Content/Assets/AnimationGraph.cpp

@@ -129,6 +129,8 @@ bool AnimationGraph::InitAsAnimation(SkinnedModel* baseModel, Animation* anim, b
 
 BytesContainer AnimationGraph::LoadSurface()
 {
+    if (!IsVirtual() && WaitForLoaded())
+        return BytesContainer();
     ScopeLock lock(Locker);
 
     if (IsVirtual())

Source/Engine/Content/Assets/AnimationGraphFunction.cpp

@@ -54,6 +54,8 @@ AssetChunksFlag AnimationGraphFunction::getChunksToPreload() const
 BytesContainer AnimationGraphFunction::LoadSurface() const
 {
     BytesContainer result;
+    if (WaitForLoaded())
+        return result;
     ScopeLock lock(Locker);
     result.Link(GraphData);
     return result;

Source/Engine/Content/Assets/Material.cpp

@@ -476,6 +476,8 @@ void Material::InitCompilationOptions(ShaderCompilationOptions& options)
 BytesContainer Material::LoadSurface(bool createDefaultIfMissing)
 {
     BytesContainer result;
+    if (WaitForLoaded())
+        return result;
     ScopeLock lock(Locker);
 
     // Check if has that chunk

Source/Engine/Content/Assets/MaterialFunction.cpp

@@ -75,6 +75,8 @@ AssetChunksFlag MaterialFunction::getChunksToPreload() const
 BytesContainer MaterialFunction::LoadSurface()
 {
     BytesContainer result;
+    if (WaitForLoaded())
+        return result;
     ScopeLock lock(Locker);
     if (HasChunk(0))
     {
@@ -89,6 +91,8 @@ BytesContainer MaterialFunction::LoadSurface()
 
 bool MaterialFunction::LoadSurface(MaterialGraph& graph)
 {
+    if (WaitForLoaded())
+        return true;
     ScopeLock lock(Locker);
     if (HasChunk(0))
     {

Source/Engine/Content/Assets/VisualScript.cpp

@@ -2116,6 +2116,8 @@ const VisualScript::Field* VisualScript::FindField(const StringAnsiView& name) c
 
 BytesContainer VisualScript::LoadSurface()
 {
+    if (WaitForLoaded())
+        return BytesContainer();
     ScopeLock lock(Locker);
     if (!LoadChunks(GET_CHUNK_FLAG(0)))
     {
@@ -2124,7 +2126,6 @@ BytesContainer VisualScript::LoadSurface()
         result.Copy(data->Data);
         return result;
     }
-
     LOG(Warning, "\'{0}\' surface data is missing.", ToString());
     return BytesContainer();
 }

Source/Engine/Particles/ParticleEmitter.cpp

@@ -335,6 +335,8 @@ void ParticleEmitter::InitCompilationOptions(ShaderCompilationOptions& options)
 BytesContainer ParticleEmitter::LoadSurface(bool createDefaultIfMissing)
 {
     BytesContainer result;
+    if (WaitForLoaded())
+        return result;
     ScopeLock lock(Locker);
 
     // Check if has that chunk

Source/Engine/Particles/ParticleEmitterFunction.cpp

@@ -84,6 +84,8 @@ AssetChunksFlag ParticleEmitterFunction::getChunksToPreload() const
 
 bool ParticleEmitterFunction::LoadSurface(ParticleEmitterGraphCPU& graph)
 {
+    if (WaitForLoaded())
+        return true;
     ScopeLock lock(Locker);
     if (HasChunk(0))
     {
@@ -102,6 +104,8 @@ bool ParticleEmitterFunction::LoadSurface(ParticleEmitterGraphCPU& graph)
 BytesContainer ParticleEmitterFunction::LoadSurface()
 {
     BytesContainer result;
+    if (WaitForLoaded())
+        return result;
     ScopeLock lock(Locker);
     if (HasChunk(0))
     {
@@ -118,6 +122,8 @@ BytesContainer ParticleEmitterFunction::LoadSurface()
 
 bool ParticleEmitterFunction::LoadSurface(ParticleEmitterGraphGPU& graph)
 {
+    if (WaitForLoaded())
+        return true;
     ScopeLock lock(Locker);
     if (HasChunk(0))
     {