From 028b00c2c2d1ba2ad46412d201a3da692a4de7f8 Mon Sep 17 00:00:00 2001
From: Fabian Greffrath <fabian@greffrath.com>
Date: Tue, 12 Jul 2022 18:55:57 +0200
Subject: [PATCH] support '-skill 0' command line parameter (does not spawn any
 map objects) (#653)

* support '-skill 0' command line parameter (does not spawn any map objects)

* enable just for demo_compatibility

* distinguish between skill "none" and default skill
---
 src/d_main.c  | 2 +-
 src/doomdef.h | 1 +
 src/g_game.c  | 2 +-
 src/p_mobj.c  | 5 +++--
 4 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/d_main.c b/src/d_main.c
index a09da4ae..deb9dc6d 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -2118,7 +2118,7 @@ void D_DoomMain(void)
 
   // get skill / episode / map from parms
 
-  startskill = sk_none; // jff 3/24/98 was sk_medium, just note not picked
+  startskill = sk_default; // jff 3/24/98 was sk_medium, just note not picked
   startepisode = 1;
   startmap = 1;
   autostart = false;
diff --git a/src/doomdef.h b/src/doomdef.h
index 6ceb9d20..4131b3fa 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -140,6 +140,7 @@ typedef enum {
 #define MTF_RESERVED          256
 
 typedef enum {
+  sk_default=-2,
   sk_none=-1, //jff 3/24/98 create unpicked skill setting
   sk_baby=0,
   sk_easy,
diff --git a/src/g_game.c b/src/g_game.c
index cc83d80f..7b308fe2 100644
--- a/src/g_game.c
+++ b/src/g_game.c
@@ -2739,7 +2739,7 @@ void G_ReloadDefaults(void)
 
   //jff 3/24/98 set startskill from defaultskill in config file, unless
   // it has already been set by a -skill parameter
-  if (startskill==sk_none)
+  if (startskill==sk_default)
     startskill = (skill_t)(defaultskill-1);
 
   demoplayback = false;
diff --git a/src/p_mobj.c b/src/p_mobj.c
index 360ae687..e14dbb0a 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -1209,10 +1209,11 @@ void P_SpawnMapThing (mapthing_t* mthing)
     return;
 
   // killough 11/98: simplify
-  if (gameskill == sk_baby || gameskill == sk_easy ? 
+  if ((gameskill == sk_none && demo_compatibility) ||
+      (gameskill == sk_baby || gameskill == sk_easy ?
       !(mthing->options & MTF_EASY) :
       gameskill == sk_hard || gameskill == sk_nightmare ?
-      !(mthing->options & MTF_HARD) : !(mthing->options & MTF_NORMAL))
+      !(mthing->options & MTF_HARD) : !(mthing->options & MTF_NORMAL)))
     return;
 
   // [crispy] support MUSINFO lump (dynamic music changing)