From 992ba0bbf48bc797ed891c128ddbcc3d46cdc38a Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@zdoom.fake>
Date: Fri, 26 Jul 2013 00:52:12 +0200
Subject: [PATCH] - added handling of MF3_FOILINVUL for A_BFGSpray. This
 function needs special treatment because the shooting player is considered
 the inflictor of the spray damage.

---
 src/g_doom/a_doomweaps.cpp | 3 ++-
 src/p_interaction.cpp      | 2 +-
 src/p_local.h              | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/g_doom/a_doomweaps.cpp b/src/g_doom/a_doomweaps.cpp
index 5c5bb7eba..9dd055711 100644
--- a/src/g_doom/a_doomweaps.cpp
+++ b/src/g_doom/a_doomweaps.cpp
@@ -589,7 +589,8 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BFGSpray)
 			damage += (pr_bfgspray() & 7) + 1;
 
 		thingToHit = linetarget;
-		int newdam = P_DamageMobj (thingToHit, self->target, self->target, damage, spray != NULL? FName(spray->DamageType) : FName(NAME_BFGSplash));
+		int newdam = P_DamageMobj (thingToHit, self->target, self->target, damage, spray != NULL? FName(spray->DamageType) : FName(NAME_BFGSplash), 
+			spray != NULL && (spray->flags3 & MF3_FOILINVUL)? DMG_FOILINVUL : 0);
 		P_TraceBleed (newdam > 0 ? newdam : damage, thingToHit, self->target);
 	}
 }
diff --git a/src/p_interaction.cpp b/src/p_interaction.cpp
index 43499d353..919bd8654 100644
--- a/src/p_interaction.cpp
+++ b/src/p_interaction.cpp
@@ -965,7 +965,7 @@ int P_DamageMobj (AActor *target, AActor *inflictor, AActor *source, int damage,
 	{ // actor is invulnerable
 		if (target->player == NULL)
 		{
-			if (inflictor == NULL || !(inflictor->flags3 & MF3_FOILINVUL))
+			if (inflictor == NULL || (!(inflictor->flags3 & MF3_FOILINVUL) && !(flags & DMG_FOILINVUL)))
 			{
 				return -1;
 			}
diff --git a/src/p_local.h b/src/p_local.h
index a4da0a04b..e7fb2cb7d 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -554,6 +554,7 @@ enum EDmgFlags
 	DMG_FORCED = 8,
 	DMG_NO_FACTOR = 16,
 	DMG_PLAYERATTACK = 32,
+	DMG_FOILINVUL = 64,
 };