Make demo loop handling of DEMO4 case depend on the executable version

being emulated: the Vanilla versions did not have any conditional
behavior based on gamemode/gamemission.
This has the side effect of causing the game to exit with an error when
playing with Final Doom, but this is Vanilla behavior.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 2230

1 files changed, 23 insertions, 0 deletions

diff --git a/NOT-BUGS b/NOT-BUGS
index 38d97770..f7d22231 100644
--- a/NOT-BUGS
+++ b/NOT-BUGS
@@ -31,6 +31,29 @@ upgrade.
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+== Game exits in demo loop when playing Final Doom ==
+
+When playing with the Final Doom IWAD files (tnt.wad, plutonia.wad),
+if you leave the game at the title screen to play through the demo
+loop, it will eventually exit with the following error message:
+
+    W_GetNumForName: demo4 not found!
+
+This is the same behavior as the Vanilla executables that were
+bundled with Final Doom.  When Ultimate Doom was developed, a fourth
+demo was added to the demo loop, and this change was retained in the
+Final Doom version of the executable.  However, the Final Doom IWADs
+do not include a fourth demo, so the game crashes.
+
+One way to work around this problem is to make the game emulate the
+original (pre-Ultimate Doom) v1.9 executable.  To do this, add the
+command line argument "-gameversion 1.9" when running the game.
+However, be aware this version does have some subtle differences that
+will affect the playback of Final Doom demos (lost soul bouncing,
+teleport behavior).
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 == Game exits when accessing the options menu ==
 
 The game may exit with the message "Bad V_DrawPatch" when accessing