- Modified the way autosaves are done. Instead of setting gameaction to

ga_autosave, write DEM_CHECKAUTOSAVE to the net stream. When this is
  processed, it will check if it's okay to do an autosave. If it is, it writes
  DEM_DOAUTOSAVE to the net stream, which the sets gameaction to ga_autosave.
  Essentially, about half of the functionality was moved out of G_DoAutoSave()
  and into Net_DoCommand().
- Minor changes to OS detection: The os_WinNT enumeration has been renamed to
  os_WinNT4, since every new OS coming out of Microsoft these days is
  essentially NT. NT 5.2 and 6.0 are now properly identified as "Windows
  Server 2003" and "Windows Vista" respectively, and any unknown NT versions
  Microsoft introduces in the future will now be displayed as "Windows NT"
  instead of "Windows 2000" if the minor version is 0 and "Windows XP" if the
  minor version is non-0. Win32s detection has also been removed. Presumably
  if somebody is foolish enough to try to run this on Windows 3.x with Win32s,
  it won't even load due to missing DLLs.
- Fixed: Demos with NETD chunks should not set netgame to true unless they
  have more than one player. And since netdemo is ignored if netgame is
  false, it doesn't need to set that either.
- Fixed: FTexture::GetScaled* functions did not check for scale values of 0.


SVN r354 (trunk)

src/d_net.cpp

@@ -55,6 +55,9 @@
 int P_StartScript (AActor *who, line_t *where, int script, char *map, bool backSide,
 					int arg0, int arg1, int arg2, int always, bool wantResultCode, bool net);
 
+EXTERN_CVAR (Int, disableautosave)
+EXTERN_CVAR (Int, autosavecount)
+
 //#define SIMULATEERRORS		(RAND_MAX/3)
 #define SIMULATEERRORS			0
 
@@ -2220,6 +2223,25 @@ void Net_DoCommand (int type, BYTE **stream, int player)
 		gameaction = ga_savegame;
 		break;
 
+	case DEM_CHECKAUTOSAVE:
+		// Do not autosave in multiplayer games or when dead.
+		// For demo playback, DEM_DOAUTOSAVE already exists in the demo if the
+		// autosave happened. And if it doesn't, we must not generate it.
+		if (multiplayer ||
+			demoplayback ||
+			players[consoleplayer].playerstate != PST_LIVE ||
+			disableautosave >= 2 ||
+			autosavecount == 0)
+		{
+			break;
+		}
+		Net_WriteByte (DEM_DOAUTOSAVE);
+		break;
+
+	case DEM_DOAUTOSAVE:
+		gameaction = ga_autosave;
+		break;
+
 	case DEM_FOV:
 		{
 			float newfov = (float)ReadByte (stream);