Export DecalBase

Allows setting this between Actors with type safety. Now also serializes these fields.

src/serializer_doom.cpp

@@ -52,6 +52,7 @@
 #include "g_levellocals.h"
 #include "p_conversation.h"
 #include "p_terrain.h"
+#include "decallib.h"
 
 #include "serializer_internal.h"
 
@@ -449,6 +450,34 @@ FSerializer &Serialize(FSerializer &arc, const char *key, FState *&state, FState
 
 }
 
+template<> FSerializer& Serialize(FSerializer& arc, const char* key, FDecalBase*& decal, FDecalBase** def)
+{
+	if (arc.isWriting())
+	{
+		if (!arc.w->inObject() || def == nullptr || decal != *def)
+		{
+			arc.WriteKey(key);
+			if (decal == nullptr)
+				arc.w->Null();
+			else
+				arc.w->String(decal->GetDecalName().GetChars());
+		}
+	}
+	else
+	{
+		auto d = arc.r->FindKey(key);
+		if (d != nullptr)
+		{
+			if (!d->IsString())
+				decal = nullptr;
+			else
+				decal = DecalLibrary.GetDecalBaseByName(d->GetString());
+		}
+	}
+
+	return arc;
+}
+
 //==========================================================================
 //
 //