From 8bda3564127596ccc85879bd0616b4b7175c3495 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <c.oelckers@zdoom.fake>
Date: Wed, 27 Apr 2016 04:08:06 +0200
Subject: [PATCH] - fixed crash in slope drawing: Several overlooked occurences
 of fixed point math in R_CalcTiltedLighting. Slopes are still completely
 broken, though.

---
 src/r_plane.cpp | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/r_plane.cpp b/src/r_plane.cpp
index 790bb9309..a3877010f 100644
--- a/src/r_plane.cpp
+++ b/src/r_plane.cpp
@@ -287,21 +287,21 @@ void R_CalcTiltedLighting (double lval, double lend, int width)
 		}
 		if (width > 0)
 		{
-			lval = planeshade - lval;
-			lend = planeshade - lend;
+			lval = FIXED2DBL(planeshade) - lval;
+			lend = FIXED2DBL(planeshade) - lend;
 			lstep = (lend - lval) / width;
 			if (lstep < 0)
 			{ // Going from dark to light
-				if (lval < FRACUNIT)
+				if (lval < 1.)
 				{ // All bright
 					lightfiller = basecolormapdata;
 				}
 				else
 				{
-					if (lval >= NUMCOLORMAPS*FRACUNIT)
+					if (lval >= NUMCOLORMAPS)
 					{ // Starts beyond the dark end
 						BYTE *clight = basecolormapdata + ((NUMCOLORMAPS-1) << COLORMAPSHIFT);
-						while (lval >= NUMCOLORMAPS*FRACUNIT && i <= width)
+						while (lval >= NUMCOLORMAPS && i <= width)
 						{
 							tiltlighting[i++] = clight;
 							lval += lstep;
@@ -319,7 +319,7 @@ void R_CalcTiltedLighting (double lval, double lend, int width)
 			}
 			else
 			{ // Going from light to dark
-				if (lval >= (NUMCOLORMAPS-1)*FRACUNIT)
+				if (lval >= (NUMCOLORMAPS-1))
 				{ // All dark
 					lightfiller = basecolormapdata + ((NUMCOLORMAPS-1) << COLORMAPSHIFT);
 				}
@@ -332,7 +332,7 @@ void R_CalcTiltedLighting (double lval, double lend, int width)
 					}
 					if (i > width)
 						return;
-					while (i <= width && lval < (NUMCOLORMAPS-1)*FRACUNIT)
+					while (i <= width && lval < (NUMCOLORMAPS-1))
 					{
 						tiltlighting[i++] = basecolormapdata + (xs_ToInt(lval) << COLORMAPSHIFT);
 						lval += lstep;