From 3dfc3e73d283fff3becfbf37c92588563115a12a Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Sat, 8 May 2021 15:23:45 +0200
Subject: [PATCH] - only process actually existing mirrors when updating their
 state.

---
 source/games/sw/src/draw.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/games/sw/src/draw.cpp b/source/games/sw/src/draw.cpp
index 6b88ed6e3..c8305ebde 100644
--- a/source/games/sw/src/draw.cpp
+++ b/source/games/sw/src/draw.cpp
@@ -1374,7 +1374,7 @@ void polymost_drawscreen(PLAYERp pp, int tx, int ty, int tz, binangle tang, fixe
 void UpdateWallPortalState()
 {
     // This is too obtuse to be maintained statically, but with 8 mirrors at most easy to be kept up to date.
-    for (int i = 0; i < MAXMIRRORS; i++)
+    for (int i = 0; i < mirrorcnt; i++)
     {
         if (mirror[i].mirrorwall < 0) {
             continue;