Add back the Doom PWAD reload hack.

This was removed back in d190b596c566394717324296cbf6b46e67c64f5c;
at the time I didn't understand what it was or how it was supposed
to be used - it seemed like cruft left over from Doom's development.

It is actually a potentially useful feature for level authors when
developing their maps. See here: http://doomwiki.org/wiki/Reload_hack

The reload hack is a relatively obscure feature of limited usefulness
nowadays, but nonetheless a technical curiosity that ought to be
preserved in Chocolate Doom.

The reimplementation here is a lot cleaner than the original version
from the source release: W_Reload() is based on a call to W_AddFile(),
we don't reopen the reload file every time we want to read a lump,
and we include a check in W_AddFile() that we are not trying to use
the hack on more than one PWAD file.

This fixes #539.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/w_wad.h b/src/w_wad.h
index 71895749..e5dc18b3 100644
--- a/src/w_wad.h
+++ b/src/w_wad.h
@@ -56,6 +56,7 @@ extern lumpinfo_t *lumpinfo;
 extern unsigned int numlumps;
 
 wad_file_t *W_AddFile (char *filename);
+void    W_Reload (void);
 
 int	W_CheckNumForName (char* name);
 int	W_GetNumForName (char* name);