diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/p_map.c | 82 |
1 files changed, 77 insertions, 5 deletions
diff --git a/src/p_map.c b/src/p_map.c index f31bf152..384fc670 100644 --- a/src/p_map.c +++ b/src/p_map.c @@ -1,10 +1,10 @@ // Emacs style mode select -*- C++ -*- //----------------------------------------------------------------------------- // -// $Id: p_map.c 212 2005-10-17 22:07:26Z fraggle $ +// $Id: p_map.c 260 2006-01-07 19:11:54Z fraggle $ // // Copyright(C) 1993-1996 Id Software, Inc. -// Copyright(C) 2005 Simon Howard +// Copyright(C) 2005 Simon Howard, Andrey Budko // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License @@ -22,6 +22,10 @@ // 02111-1307, USA. // // $Log$ +// Revision 1.4 2006/01/07 19:11:54 fraggle +// Import the spechit overrun code from prboom-plus. Thanks to Andrey Budko +// for his investigation into this behavior. +// // Revision 1.3 2005/10/17 22:07:26 fraggle // Fix "Monsters Infight" // @@ -39,7 +43,7 @@ //----------------------------------------------------------------------------- static const char -rcsid[] = "$Id: p_map.c 212 2005-10-17 22:07:26Z fraggle $"; +rcsid[] = "$Id: p_map.c 260 2006-01-07 19:11:54Z fraggle $"; #include <stdlib.h> @@ -82,7 +86,17 @@ line_t* ceilingline; // keep track of special lines as they are hit, // but don't process them until the move is proven valid -#define MAXSPECIALCROSS 8 + +// fraggle: I have increased the size of this buffer. In the original Doom, +// overrunning past this limit caused other bits of memory to be overwritten, +// affecting demo playback. However, in doing so, the limit was still +// exceeded. So we have to support more than 8 specials. +// +// We keep the original limit, to detect what variables in memory were +// overwritten (see SpechitOverrun()) + +#define MAXSPECIALCROSS 20 +#define MAXSPECIALCROSS_ORIGINAL 8 line_t* spechit[MAXSPECIALCROSS]; int numspechit; @@ -199,6 +213,7 @@ P_TeleportMove // MOVEMENT ITERATOR FUNCTIONS // +static void SpechitOverrun(line_t *ld); // // PIT_CheckLine @@ -257,7 +272,14 @@ boolean PIT_CheckLine (line_t* ld) // if contacted a special line, add it to the list if (ld->special) { - spechit[numspechit] = ld; + // fraggle: spechits overrun emulation code from prboom-plus + if (numspechit >= MAXSPECIALCROSS_ORIGINAL) + { + SpechitOverrun(ld); + } + + spechit[numspechit] = ld; + numspechit++; } @@ -1359,3 +1381,53 @@ P_ChangeSector return nofit; } +// Code to emulate the behavior of Vanilla Doom when encountering an overrun +// of the spechit array. This is by Andrey Budko (e6y) and comes from his +// PrBoom plus port. A big thanks to Andrey for this. + +static void SpechitOverrun(line_t *ld) +{ + int addr = 0x01C09C98 + (ld - lines) * 0x3E; + + printf("Emulating spechit overrun, numspechit=%i\n", numspechit); + + switch(numspechit) + { + case 9: + case 10: + case 11: + case 12: + tmbbox[numspechit-9] = addr; + break; + case 13: + crushchange = addr; + break; + case 14: + nofit = addr; + break; + case 15: + bombsource = (mobj_t*)addr; + break; + case 16: + bombdamage = addr; + break; + case 17: + bombspot = (mobj_t*)addr; + break; + case 18: + usething = (mobj_t*)addr; + break; + case 19: + attackrange = addr; + break; + case 20: + la_damage = addr; + break; + default: + fprintf(stderr, "SpechitOverrun: Warning: unable to emulate" + "an overrun where numspechit=%i\n", + numspechit); + break; + } +} + |