From 08bf08f297ae42395dce30a44bf50c4769104e8f Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Tue, 14 Feb 2017 12:33:27 +0200
Subject: [PATCH] Restored effect of negative horizontal texture scale in
 software renderer

---
 src/r_segs.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/r_segs.cpp b/src/r_segs.cpp
index ccf6ccf20..0873cb373 100644
--- a/src/r_segs.cpp
+++ b/src/r_segs.cpp
@@ -2046,11 +2046,11 @@ void PrepWall(float *vstep, fixed_t *upos, double walxrepeat, int x1, int x2)
 	float invZ = WallT.InvZorg + WallT.InvZstep * (float)(x1 + 0.5 - CenterX);
 	float uGradient = WallT.UoverZstep;
 	float zGradient = WallT.InvZstep;
-	float xrepeat = (float)walxrepeat;
+    float xrepeat = (float)fabs(walxrepeat);
 	float depthScale = (float)(WallT.InvZstep * WallTMapScale2);
 	float depthOrg = (float)(-WallT.UoverZstep * WallTMapScale2);
 
-	if (xrepeat < 0.0f)
+    if (walxrepeat < 0.0)
 	{
 		for (int x = x1; x < x2; x++)
 		{
@@ -2084,9 +2084,9 @@ void PrepLWall(fixed_t *upos, double walxrepeat, int x1, int x2)
 	float invZ = WallT.InvZorg + WallT.InvZstep * (float)(x1 + 0.5 - CenterX);
 	float uGradient = WallT.UoverZstep;
 	float zGradient = WallT.InvZstep;
-	float xrepeat = (float)walxrepeat;
+	float xrepeat = (float)fabs(walxrepeat);
 
-	if (xrepeat < 0.0f)
+	if (walxrepeat < 0.0f)
 	{
 		for (int x = x1; x < x2; x++)
 		{