From 719ceb0586bdc462f14800a902a4af9502a59896 Mon Sep 17 00:00:00 2001
From: spherallic <spherallic@gmail.com>
Date: Sat, 1 Jan 2022 19:34:27 +0100
Subject: [PATCH] Add collision check for flipped water drops

---
 src/p_mobj.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/p_mobj.c b/src/p_mobj.c
index 39c6731b8..87e20fd4a 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -7740,7 +7740,8 @@ static void P_MobjSceneryThink(mobj_t *mobj)
 		break;
 	case MT_WATERDROP:
 		P_SceneryCheckWater(mobj);
-		if ((mobj->z <= mobj->floorz || mobj->z <= mobj->watertop)
+		if (((!(mobj->eflags & MFE_VERTICALFLIP) && (mobj->z <= mobj->floorz || mobj->z <= mobj->watertop))
+			|| (mobj->eflags & MFE_VERTICALFLIP && mobj->z + mobj->height >= mobj->ceilingz))
 			&& mobj->health > 0)
 		{
 			mobj->health = 0;