From 43981bff855ee35b29c8d92a5a770d67b522a000 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Sat, 8 May 2021 16:27:01 +0200
Subject: [PATCH] - Duke: fixed mirror setup for new renderer.

A wall must be marked one-way to be used as a mirror.
---
 source/games/duke/src/premap.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/games/duke/src/premap.cpp b/source/games/duke/src/premap.cpp
index af1e757fd..d3ff8350c 100644
--- a/source/games/duke/src/premap.cpp
+++ b/source/games/duke/src/premap.cpp
@@ -824,7 +824,7 @@ static void SpawnPortals()
 {
     for (int i = 0; i < numwalls; i++)
     {
-        if (wall[i].overpicnum == TILE_MIRROR) wall[i].portalflags |= PORTAL_WALL_MIRROR;
+        if (wall[i].overpicnum == TILE_MIRROR && (wall[i].cstat & CSTAT_WALL_1WAY)) wall[i].portalflags |= PORTAL_WALL_MIRROR;
     }
 
     portalClear();