From e7225bced6a83314cc67812c3097890aeff2ea6e Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@zdoom.fake>
Date: Sun, 1 Dec 2013 01:15:10 +0100
Subject: [PATCH] - check negative XScale on sprites to allow mirroring.

---
 src/r_things.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/r_things.cpp b/src/r_things.cpp
index 9bdba99f9..7243ac6f9 100644
--- a/src/r_things.cpp
+++ b/src/r_things.cpp
@@ -608,6 +608,11 @@ void R_ProjectSprite (AActor *thing, int fakeside, F3DFloor *fakefloor, F3DFloor
 			}
 		}
 	}
+	if (spritescaleX < 0)
+	{
+		spritescaleX = -spritescaleX;
+		flip = !flip;
+	}
 	if (voxel == NULL && (tex == NULL || tex->UseType == FTexture::TEX_Null))
 	{
 		return;