- exposed the HUD message interface to ZScript.

Note that this is just the bare abstract interface. It is up to content makers to define usable HUD message classes and optionally contribute them to the engine.

src/g_shared/hudmessages.cpp

@@ -40,6 +40,7 @@
 #include "cmdlib.h"
 #include "doomstat.h"
 #include "serializer.h"
+#include "vm.h"
 
 EXTERN_CVAR(Int, con_scaletext)
 
@@ -66,6 +67,61 @@ void DHUDMessageBase::Serialize(FSerializer &arc)
 		("sbarid", SBarID);
 }
 
+DEFINE_ACTION_FUNCTION(DHUDMessageBase, Tick)
+{
+	PARAM_SELF_PROLOGUE(DHUDMessageBase);
+	ACTION_RETURN_BOOL(self->Tick());
+}
+
+DEFINE_ACTION_FUNCTION(DHUDMessageBase, ScreenSizeChanged)
+{
+	PARAM_SELF_PROLOGUE(DHUDMessageBase);
+	self->ScreenSizeChanged();
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(DHUDMessageBase, Draw)
+{
+	PARAM_SELF_PROLOGUE(DHUDMessageBase);
+	PARAM_INT(bottom);
+	PARAM_INT(visibility);
+	self->Draw(bottom, visibility);
+	return 0;
+}
+
+bool DHUDMessageBase::CallTick()
+{
+	IFVIRTUAL(DHUDMessageBase, Tick)
+	{
+		VMValue params[] = { (DObject*)this };
+		int retval;
+		VMReturn ret; ret.IntAt(&retval);
+		VMCall(func, params, countof(params), &ret, 1);
+		return !!retval;
+	}
+	return Tick();
+}
+
+void DHUDMessageBase::CallScreenSizeChanged()
+{
+	IFVIRTUAL(DHUDMessageBase, ScreenSizeChanged)
+	{
+		VMValue params[] = { (DObject*)this };
+		VMCall(func, params, countof(params), nullptr, 0);
+	}
+	else ScreenSizeChanged();
+}
+
+void DHUDMessageBase::CallDraw(int bottom, int visibility)
+{
+	IFVIRTUAL(DHUDMessageBase, Draw)
+	{
+		VMValue params[] = { (DObject*)this, bottom, visibility };
+		VMCall(func, params, countof(params), nullptr, 0);
+	}
+	else Draw(bottom, visibility);
+}
+
 //============================================================================
 //
 // DHUDMessage Constructor