From 68fa08ca5279ad028d05bad5e90a7ea5d4daa982 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@zdoom.fake>
Date: Wed, 12 May 2010 06:54:59 +0000
Subject: [PATCH] - fixed: TNT MAP30 needs the stairbuilding compatibility
 option.

SVN r2315 (trunk)
---
 src/compatibility.cpp | 1 +
 src/d_iwad.cpp        | 2 +-
 src/gi.h              | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/compatibility.cpp b/src/compatibility.cpp
index caaaaf8718..af57688c09 100644
--- a/src/compatibility.cpp
+++ b/src/compatibility.cpp
@@ -258,6 +258,7 @@ void CheckCompatibility(MapData *map)
 	if (Wads.GetLumpFile(map->lumpnum) == 1 && (gameinfo.flags & GI_COMPATSHORTTEX) && !(level.flags & LEVEL_HEXENFORMAT))
 	{
 		ii_compatflags = COMPATF_SHORTTEX;
+		if (gameinfo.flags & GI_COMPATSHORTTEX) ii_compatflags |= COMPATF_STAIRINDEX;
 		ib_compatflags = 0;
 		ii_compatparams = -1;
 	}
diff --git a/src/d_iwad.cpp b/src/d_iwad.cpp
index 3cf9773ce0..e5939e1a7e 100644
--- a/src/d_iwad.cpp
+++ b/src/d_iwad.cpp
@@ -58,7 +58,7 @@ EIWADType gameiwad;
 const IWADInfo IWADInfos[NUM_IWAD_TYPES] =
 {
 	// banner text,								autoname,	fg color,				bg color
-	{ "Final Doom: TNT - Evilution",			"TNT",		MAKERGB(168,0,0),		MAKERGB(168,168,168),	GAME_Doom,		"mapinfo/tnt.txt",		GI_MAPxx | GI_COMPATSHORTTEX },
+	{ "Final Doom: TNT - Evilution",			"TNT",		MAKERGB(168,0,0),		MAKERGB(168,168,168),	GAME_Doom,		"mapinfo/tnt.txt",		GI_MAPxx | GI_COMPATSHORTTEX | GI_COMPATSTAIRS },
 	{ "Final Doom: Plutonia Experiment",		"Plutonia",	MAKERGB(168,0,0),		MAKERGB(168,168,168),	GAME_Doom,		"mapinfo/plutonia.txt",	GI_MAPxx | GI_COMPATSHORTTEX },
 	{ "Hexen: Beyond Heretic",					NULL,		MAKERGB(240,240,240),	MAKERGB(107,44,24),		GAME_Hexen,		"mapinfo/hexen.txt",	GI_MAPxx },
 	{ "Hexen: Deathkings of the Dark Citadel",	"HexenDK",	MAKERGB(240,240,240),	MAKERGB(139,68,9),		GAME_Hexen,		"mapinfo/hexen.txt",	GI_MAPxx },
diff --git a/src/gi.h b/src/gi.h
index 0ada094c25..a87098555b 100644
--- a/src/gi.h
+++ b/src/gi.h
@@ -43,6 +43,7 @@
 #define GI_MENUHACK_EXTENDED	0x00000004	// (Heretic)
 #define GI_TEASER2				0x00000008	// Alternate version of the Strife Teaser
 #define GI_COMPATSHORTTEX		0x00000010	// always force COMPAT_SHORTTEX for IWAD maps.
+#define GI_COMPATSTAIRS			0x00000010	// same for stairbuilding
 
 #include "gametype.h"