doom: Add -noiwaddeh command line parameter.

Both the Freedoom IWADs and the rereleased HACX IWAD contain embedded
DEHACKED lumps that are automatically loaded on startup. However,
there may be some situations where it is undesirable to load these
patches - when loading certain mods such as BTSX, for example. For
these cases, allow the user to override the default behavior with a
command line parameter.

1 files changed, 16 insertions, 6 deletions

diff --git a/src/doom/d_main.c b/src/doom/d_main.c
index d4859b30..15134d7a 100644
--- a/src/doom/d_main.c
+++ b/src/doom/d_main.c
@@ -1066,7 +1066,8 @@ static void LoadHacxDeh(void)
 
     if (gameversion == exe_hacx)
     {
-        if (!DEH_LoadLumpByName("DEHACKED", true, false))
+        if (!M_ParmExists("-noiwaddeh")
+         && !DEH_LoadLumpByName("DEHACKED", true, false))
         {
             I_Error("DEHACKED lump not found.  Please check that this is the "
                     "Hacx v1.2 IWAD.");
@@ -1300,12 +1301,21 @@ void D_DoomMain (void)
     W_CheckCorrectIWAD(doom);
 
     // The Freedoom IWADs have DEHACKED lumps with cosmetic changes to the
-    // in-game messages. Load this.
-    // Old versions of Freedoom (before 2014-09) did not have technically
-    // valid DEHACKED lumps, so ignore errors and just continue if this
-    // is an old IWAD.
-    if (W_CheckNumForName("FREEDOOM") >= 0)
+    // in-game messages. Load this, but allow it to be disabled on the
+    // command line if desired.
+
+    //!
+    // @category mod
+    //
+    // Disable automatic loading of Dehacked patches contained in some
+    // IWAD files.
+
+    if (!M_ParmExists("-noiwaddeh")
+     && W_CheckNumForName("FREEDOOM") >= 0)
     {
+        // Old versions of Freedoom (before 2014-09) did not have technically
+        // valid DEHACKED lumps, so ignore errors and just continue if this
+        // is an old IWAD.
         DEH_LoadLumpByName("DEHACKED", false, true);
     }