From 49af4a4b35380af93b5f9e54b3b5a91d9bb80539 Mon Sep 17 00:00:00 2001
From: Magnus Norddahl <dpjudas@users.noreply.github.com>
Date: Tue, 10 Dec 2019 00:44:40 +0100
Subject: [PATCH] - fix line backside textures mirrored

---
 src/rendering/swrenderer/line/r_wallsetup.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/rendering/swrenderer/line/r_wallsetup.cpp b/src/rendering/swrenderer/line/r_wallsetup.cpp
index 0f26308f18..8dbef53009 100644
--- a/src/rendering/swrenderer/line/r_wallsetup.cpp
+++ b/src/rendering/swrenderer/line/r_wallsetup.cpp
@@ -140,6 +140,12 @@ namespace swrenderer
 				t2 = (lineseg->v2->fY() - line->v1->fY()) / line->delta.Y;
 			}
 
+			if (line->sidedef[0] != lineseg->sidedef)
+			{
+				t1 = 1.0f - t1;
+				t2 = 1.0f - t2;
+			}
+
 			tx1 = t1 + tx1 * (t2 - t1);
 			tx2 = t1 + tx2 * (t2 - t1);
 		}