Fix opening projects with PostFx material assigned in Graphics Settings

#1993

Source/Engine/Content/SoftAssetReference.h

@@ -89,6 +89,11 @@ public:
         OnSet(other.GetID());
     }
 
+    SoftAssetReference(const Guid& id)
+    {
+        OnSet(id);
+    }
+
     SoftAssetReference(SoftAssetReference&& other)
     {
         OnSet(other.GetID());
@@ -111,6 +116,10 @@ public:
     {
         return GetID() == other.GetID();
     }
+    FORCE_INLINE bool operator==(const Guid& other) const
+    {
+        return GetID() == other;
+    }
     FORCE_INLINE bool operator!=(T* other) const
     {
         return Get() != other;
@@ -119,6 +128,10 @@ public:
     {
         return GetID() != other.GetID();
     }
+    FORCE_INLINE bool operator!=(const Guid& other) const
+    {
+        return GetID() != other;
+    }
     SoftAssetReference& operator=(const SoftAssetReference& other)
     {
         if (this != &other)

Source/Engine/Graphics/PostProcessSettings.cpp

@@ -207,12 +207,11 @@ void PostFxMaterialsSettings::BlendWith(PostFxMaterialsSettings& other, float we
     if (isHalf)
     {
         int32 indexSrc = 0;
-        const AssetReference<MaterialBase>* materialsSrc = other.Materials.Get();
+        const SoftAssetReference<MaterialBase>* materialsSrc = other.Materials.Get();
         while (Materials.Count() != POST_PROCESS_SETTINGS_MAX_MATERIALS && indexSrc < other.Materials.Count())
         {
-            MaterialBase* mat = materialsSrc[indexSrc].Get();
-            if (mat && !Materials.Contains(mat))
-                Materials.Add(mat);
+            if (!Materials.Contains(materialsSrc[indexSrc].GetID()))
+                Materials.Add(materialsSrc[indexSrc]);
             indexSrc++;
         }
     }

Source/Engine/Graphics/PostProcessSettings.h

@@ -1929,8 +1929,8 @@ API_STRUCT() struct FLAXENGINE_API PostFxMaterialsSettings : ISerializable
     /// <summary>
     /// The post-process materials collection for rendering (fixed capacity).
     /// </summary>
-    API_FIELD(Attributes="EditorDisplay(null, EditorDisplayAttribute.InlineStyle)")
-    Array<AssetReference<MaterialBase>, FixedAllocation<POST_PROCESS_SETTINGS_MAX_MATERIALS>> Materials;
+    API_FIELD(Attributes="EditorDisplay(null, EditorDisplayAttribute.InlineStyle), Collection(MaxCount=8)")
+    Array<SoftAssetReference<MaterialBase>, FixedAllocation<POST_PROCESS_SETTINGS_MAX_MATERIALS>> Materials;
 
 public:
     /// <summary>

Source/Engine/Scripting/ManagedCLR/MUtils.h

@@ -347,6 +347,31 @@ struct MConverter<AssetReference<T>>
     }
 };
 
+// TODO: use MarshalAs=Guid on SoftAssetReference to pass guid over bindings and not load asset in glue code
+template<typename T>
+class SoftAssetReference;
+template<typename T>
+struct MConverter<SoftAssetReference<T>>
+{
+    void ToManagedArray(MArray* result, const Span<SoftAssetReference<T>>& data)
+    {
+        if (data.Length() == 0)
+            return;
+        MObject** objects = (MObject**)Allocator::Allocate(data.Length() * sizeof(MObject*));
+        for (int32 i = 0; i < data.Length(); i++)
+            objects[i] = data[i].GetManagedInstance();
+        MCore::GC::WriteArrayRef(result, Span<MObject*>(objects, data.Length()));
+        Allocator::Free(objects);
+    }
+
+    void ToNativeArray(Span<SoftAssetReference<T>>& result, const MArray* data)
+    {
+        MObject** dataPtr = MCore::Array::GetAddress<MObject*>(data);
+        for (int32 i = 0; i < result.Length(); i++)
+            result.Get()[i] = (T*)ScriptingObject::ToNative(dataPtr[i]);
+    }
+};
+
 // Converter for Array.
 template<typename T>
 struct MConverter<Array<T>>