From 9e2e6759bd39f1217561850b4c04594a9916e44a Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Sun, 18 Jun 2023 15:33:57 +0200
Subject: [PATCH] Implement proper POD types check in C# network replication
 codegen

---
 .../Flax.Build/Bindings/StructureInfo.cs      |  2 +-
 .../Build/Plugins/NetworkingPlugin.cs         | 20 +++++++++++++++++--
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/Source/Tools/Flax.Build/Bindings/StructureInfo.cs b/Source/Tools/Flax.Build/Bindings/StructureInfo.cs
index d9dd87215..70fa17c36 100644
--- a/Source/Tools/Flax.Build/Bindings/StructureInfo.cs
+++ b/Source/Tools/Flax.Build/Bindings/StructureInfo.cs
@@ -32,7 +32,7 @@ namespace Flax.Build.Bindings
                 return;
             }
 
-            // Structure is POD (plain old data) only if all of it's fields are (and has no base type ro base type is also POD)
+            // Structure is POD (plain old data) only if all of it's fields are (and has no base type or base type is also POD)
             _isPod = BaseType == null || (BaseType?.IsPod ?? false);
             for (int i = 0; _isPod && i < Fields.Count; i++)
             {
diff --git a/Source/Tools/Flax.Build/Build/Plugins/NetworkingPlugin.cs b/Source/Tools/Flax.Build/Build/Plugins/NetworkingPlugin.cs
index f153bf30d..e047f5116 100644
--- a/Source/Tools/Flax.Build/Build/Plugins/NetworkingPlugin.cs
+++ b/Source/Tools/Flax.Build/Build/Plugins/NetworkingPlugin.cs
@@ -367,8 +367,24 @@ namespace Flax.Build.Plugins
 
         private static bool IsRawPOD(TypeReference type)
         {
-            // TODO: 
-            return type.IsValueType;
+            if (type.FullName == "System.ValueType")
+                return true;
+            if (type.IsValueType)
+            {
+                var typeDef = type.Resolve();
+                if (typeDef.IsEnum)
+                    return true;
+                var baseType = typeDef.BaseType;
+                if (baseType != null && !IsRawPOD(baseType))
+                    return false;
+                foreach (var field in typeDef.Fields)
+                {
+                    if (!field.IsStatic && field.FieldType != type && !IsRawPOD(field.FieldType))
+                        return false;
+                }
+                return true;
+            }
+            return false;
         }
 
         private void OnGenerateCppTypeSerializeData(Builder.BuildData buildData, ApiTypeInfo caller, StringBuilder contents, TypeInfo type, string name, bool serialize)