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d_main.c
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//
// Copyright (C) 1993-1996 Id Software, Inc.
// Copyright (C) 2023-2024 Frenkel Smeijers
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
// D_main.c
#include <sys/stat.h>
#include <unistd.h>
#include <direct.h>
#include <io.h>
#include <dos.h>
#include "doomdef.h"
#include "soundst.h"
#include "dutils.h"
#if (APPVER_DOOMREV < AV_DR_DM19)
#define BGCOLOR 4
#define FGCOLOR 15
#elif (APPVER_DOOMREV < AV_DR_DM19UP)
#define BGCOLOR 7
#define FGCOLOR 4
#elif (APPVER_DOOMREV < AV_DR_DM19U)
#define BGCOLOR 3
#define FGCOLOR 0
#else
#define BGCOLOR 7
#define FGCOLOR 8
#endif
#define MAXWADFILES 20
static char *wadfiles[MAXWADFILES];
boolean shareware; // true if only episode 1 present
boolean registered;
boolean commercial;
#if (APPVER_DOOMREV >= AV_DR_DM18FR)
boolean french;
#if (APPVER_DOOMREV >= AV_DR_DM19F)
boolean plutonia;
boolean tnt;
#endif
#endif
boolean devparm; // started game with -devparm
boolean nomonsters; // checkparm of -nomonsters
boolean respawnparm; // checkparm of -respawn
boolean fastparm; // checkparm of -fastparm
boolean modifiedgame;
boolean singletics = false; // debug flag to cancel adaptiveness
extern int32_t soundVolume;
extern int32_t sfxVolume;
extern int32_t musicVolume;
extern boolean inhelpscreens;
skill_t startskill;
int32_t startepisode;
int32_t startmap;
boolean autostart;
FILE *debugfile;
boolean advancedemo;
char basedefault[1024]; // default file
void D_CheckNetGame(void);
void D_ProcessEvents(void);
void G_BuildTiccmd(ticcmd_t *cmd);
void D_DoAdvanceDemo(void);
static void D_PageDrawer (void);
void D_AdvanceDemo (void);
void F_Drawer(void);
boolean F_Responder(event_t *ev);
/*
===============================================================================
EVENT HANDLING
Events are asyncronous inputs generally generated by the game user.
Events can be discarded if no responder claims them
===============================================================================
*/
event_t events[MAXEVENTS];
int32_t eventhead;
int32_t eventtail;
/*
================
=
= D_PostEvent
=
= Called by the I/O functions when input is detected
=
================
*/
void D_PostEvent (event_t *ev)
{
events[eventhead] = *ev;
eventhead = (eventhead+1)&(MAXEVENTS-1);
}
/*
================
=
= D_ProcessEvents
=
= Send all the events of the given timestamp down the responder chain
=
================
*/
void D_ProcessEvents (void)
{
event_t *ev;
#if (APPVER_DOOMREV >= AV_DR_DM1666E)
// IF STORE DEMO, DO NOT ACCEPT INPUT
if ( commercial && (W_CheckNumForName("map01")<0) )
return;
#endif
for ( ; eventtail != eventhead ; eventtail = (eventtail+1)&(MAXEVENTS-1) )
{
ev = &events[eventtail];
if (M_Responder(ev))
continue; // menu ate the event
G_Responder(ev);
}
}
/*
================
=
= FixedMul and FixedDiv
=
================
*/
#if defined C_ONLY
fixed_t FixedMul (fixed_t a, fixed_t b)
{
return ((int64_t) a * (int64_t) b) >> FRACBITS;
}
static fixed_t FixedDiv2 (fixed_t a, fixed_t b)
{
int64_t result = ((int64_t) a << FRACBITS) / b;
return (fixed_t) result;
}
#else
#if defined __DJGPP__
fixed_t FixedMul(fixed_t a, fixed_t b)
{
asm
(
"imul %2 \n"
"shrd $16, %%edx, %%eax"
: "=a" (a)
: "a" (a), "r" (b)
: "edx"
);
return a;
}
static fixed_t FixedDiv2(fixed_t a, fixed_t b)
{
asm
(
"cdq \n"
"shld $16, %%eax, %%edx \n"
"shl $16, %%eax \n"
"idiv %2"
: "=a" (a)
: "a" (a), "r" (b)
: "edx"
);
return a;
}
#elif defined __DMC__ || defined __CCDL__
fixed_t FixedMul(fixed_t a, fixed_t b)
{
asm
{
mov eax, [a]
mov ecx, [b]
imul ecx
shrd eax, edx, 16
};
return _EAX;
}
static fixed_t FixedDiv2(fixed_t a, fixed_t b)
{
asm
{
mov eax, [a]
mov ecx, [b]
cdq
shld edx, eax, 16
shl eax, 16
idiv ecx
};
return _EAX;
}
#endif
#endif
fixed_t FixedDiv (fixed_t a, fixed_t b)
{
if ( (abs(a)>>14) >= abs(b))
return ((a ^ b) >> 31) ^ MAXINT;
else
return FixedDiv2 (a,b);
}
/*
================
=
= D_Display
=
= draw current display, possibly wiping it from the previous
=
================
*/
// wipegamestate can be set to -1 to force a wipe on the next draw
gamestate_t wipegamestate = GS_DEMOSCREEN;
extern boolean setsizeneeded;
extern int32_t showMessages;
void R_ExecuteSetViewSize (void);
static void D_Display (void)
{
static boolean viewactivestate = false;
static boolean menuactivestate = false;
static boolean inhelpscreensstate = false;
static boolean fullscreen = false;
static gamestate_t oldgamestate = -1;
static int32_t borderdrawcount;
int32_t nowtime;
int32_t tics;
int32_t wipestart;
int32_t y;
boolean done;
boolean wipe;
boolean redrawsbar;
if (nodrawers)
return; // for comparative timing / profiling
redrawsbar = false;
// Change the view size if needed
if (setsizeneeded)
{
R_ExecuteSetViewSize ();
oldgamestate = -1; // force background redraw
borderdrawcount = 3;
}
// save the current screen if about to wipe
if (gamestate != wipegamestate)
{
wipe = true;
wipe_StartScreen();
}
else
wipe = false;
if (gamestate == GS_LEVEL && gametic)
HU_Erase();
//
// do buffered drawing
//
switch (gamestate)
{
case GS_LEVEL:
if (!gametic)
break;
if (automapactive)
AM_Drawer ();
if (wipe || (viewheight != SCREENHEIGHT && fullscreen) )
redrawsbar = true;
if (inhelpscreensstate && !inhelpscreens)
redrawsbar = true; // just put away the help screen
ST_Drawer (viewheight == SCREENHEIGHT, redrawsbar );
fullscreen = viewheight == SCREENHEIGHT;
break;
case GS_INTERMISSION:
WI_Drawer ();
break;
case GS_FINALE:
F_Drawer ();
break;
case GS_DEMOSCREEN:
D_PageDrawer ();
break;
}
// draw buffered stuff to screen
I_UpdateNoBlit ();
// draw the view directly
if (gamestate == GS_LEVEL && !automapactive && gametic)
R_RenderPlayerView (&players[displayplayer]);
if (gamestate == GS_LEVEL && gametic)
HU_Drawer ();
// clean up border stuff
if (gamestate != oldgamestate && gamestate != GS_LEVEL)
I_SetPalette (W_CacheLumpName ("PLAYPAL",PU_CACHE));
// see if the border needs to be initially drawn
if (gamestate == GS_LEVEL && oldgamestate != GS_LEVEL)
{
viewactivestate = false; // view was not active
R_FillBackScreen (); // draw the pattern into the back screen
}
// see if the border needs to be updated to the screen
if (gamestate == GS_LEVEL && !automapactive && scaledviewwidth != SCREENWIDTH)
{
if (menuactive || menuactivestate || !viewactivestate)
borderdrawcount = 3;
if (borderdrawcount)
{
R_DrawViewBorder (); // erase old menu stuff
borderdrawcount--;
}
}
menuactivestate = menuactive;
viewactivestate = viewactive;
inhelpscreensstate = inhelpscreens;
oldgamestate = wipegamestate = gamestate;
// draw pause pic
if (paused)
{
if (automapactive)
y = 4;
else
y = viewwindowy+4;
V_DrawPatchDirect(viewwindowx+(scaledviewwidth-68)/2,y,W_CacheLumpName ("M_PAUSE", PU_CACHE));
}
// menus go directly to the screen
M_Drawer (); // menu is drawn even on top of everything
NetUpdate (); // send out any new accumulation
// normal update
if (!wipe)
{
I_FinishUpdate (); // page flip or blit buffer
return;
}
// wipe update
wipe_EndScreen();
wipestart = I_GetTime () - 1;
do
{
do
{
nowtime = I_GetTime ();
tics = nowtime - wipestart;
} while (!tics);
wipestart = nowtime;
done = wipe_ScreenWipe(tics);
I_UpdateNoBlit ();
M_Drawer (); // menu is drawn even on top of wipes
I_FinishUpdate (); // page flip or blit buffer
} while (!done);
}
/*
================
=
= D_DoomLoop
=
================
*/
static void _Noreturn D_DoomLoop(void)
{
if (demorecording)
G_BeginRecording ();
if (M_CheckParm ("-debugfile"))
{
char filename[20];
sprintf (filename, "debug%i.txt", consoleplayer);
printf ("debug output to: %s\n", filename);
debugfile = fopen (filename,"w");
}
I_InitGraphics ();
while (1)
{
// frame syncronous IO operations
I_StartFrame();
// process one or more tics
if (singletics)
{
I_StartTic ();
D_ProcessEvents ();
G_BuildTiccmd (&netcmds[consoleplayer][maketic%BACKUPTICS]);
if (advancedemo)
D_DoAdvanceDemo ();
M_Ticker ();
G_Ticker ();
gametic++;
maketic++;
}
else
{
// will run at least one tic
TryRunTics ();
}
// move positional sounds
S_UpdateSounds(players[consoleplayer].mo);
D_Display();
}
}
/*
===============================================================================
DEMO LOOP
===============================================================================
*/
static int32_t demosequence;
static int32_t pagetic;
static char *pagename;
/*
================
=
= D_PageTicker
=
= Handles timing for warped projection
=
================
*/
void D_PageTicker (void)
{
if (--pagetic < 0)
D_AdvanceDemo ();
}
/*
================
=
= D_PageDrawer
=
================
*/
static void D_PageDrawer (void)
{
V_DrawPatch (0,0, 0, W_CacheLumpName(pagename, PU_CACHE));
}
/*
=================
=
= D_AdvanceDemo
=
= Called after each demo or intro demosequence finishes
=================
*/
void D_AdvanceDemo (void)
{
advancedemo = true;
}
void D_DoAdvanceDemo (void)
{
players[consoleplayer].playerstate = PST_LIVE; // don't reborn
advancedemo = false;
usergame = false; // can't save / end game here
paused = false;
gameaction = ga_nothing;
#if (APPVER_DOOMREV >= AV_DR_DM19U) && (APPVER_DOOMREV < AV_DR_DM19F2)
demosequence = (demosequence+1)%7;
#else
demosequence = (demosequence+1)%6;
#endif
switch (demosequence)
{
case 0:
if ( commercial )
pagetic = TICRATE * 11;
else
pagetic = 170;
gamestate = GS_DEMOSCREEN;
pagename = "TITLEPIC";
if ( commercial )
S_StartMusic(mus_dm2ttl);
else
S_StartMusic (mus_intro);
break;
case 1:
G_DeferedPlayDemo ("demo1");
break;
case 2:
pagetic = 200;
gamestate = GS_DEMOSCREEN;
pagename = "CREDIT";
break;
case 3:
G_DeferedPlayDemo ("demo2");
break;
case 4:
gamestate = GS_DEMOSCREEN;
if ( commercial )
{
pagetic = TICRATE * 11;
pagename = "TITLEPIC";
S_StartMusic(mus_dm2ttl);
}
else
{
pagetic = 200;
#if (APPVER_DOOMREV < AV_DR_DM19U)
pagename = "HELP2";
#else
pagename = "CREDIT";
#endif
}
break;
case 5:
G_DeferedPlayDemo ("demo3");
break;
#if (APPVER_DOOMREV >= AV_DR_DM19U)
// THE DEFINITIVE DOOM Special Edition demo
case 6:
G_DeferedPlayDemo ("demo4");
break;
#endif
}
}
/*
=================
=
= D_StartTitle
=
=================
*/
void D_StartTitle (void)
{
gameaction = ga_nothing;
demosequence = -1;
D_AdvanceDemo ();
}
static char title[128]; // print title for every printed line
static int32_t GetTextX(void)
{
union REGS regs;
regs.h.ah = 3;
regs.h.bh = 0;
int386(0x10, ®s, ®s);
return regs.h.dl;
}
static int32_t GetTextY(void)
{
union REGS regs;
regs.h.ah = 3;
regs.h.bh = 0;
int386(0x10, ®s, ®s);
return regs.h.dh;
}
static void SetTextPos(int32_t x, int32_t y)
{
union REGS regs;
regs.h.ah = 2;
regs.h.bh = 0;
regs.h.dh = y;
regs.h.dl = x;
int386(0x10, ®s, ®s);
}
static void tprintf(char *msg, int32_t fgcolor, int32_t bgcolor)
{
union REGS regs;
byte attr;
int32_t x;
int32_t y;
int32_t i;
attr = (bgcolor << 4) | fgcolor;
x = GetTextX();
y = GetTextY();
for (i = 0; i < strlen(msg); i++)
{
regs.h.ah = 9;
regs.h.al = msg[i];
regs.h.ch = 0;
regs.h.cl = 1;
regs.h.bl = attr;
regs.h.bh = 0;
int386(0x10, ®s, ®s);
if (++x > 79)
x = 0;
SetTextPos(x, y);
}
}
void mprintf(char *msg)
{
int32_t x, y;
printf(msg);
x = GetTextX();
y = GetTextY();
SetTextPos(0, 0);
tprintf(title, FGCOLOR, BGCOLOR);
SetTextPos(x, y);
}
/*
===============
=
= D_AddFile
=
===============
*/
static void D_AddFile(char *file)
{
int32_t numwadfiles;
char *new;
numwadfiles = 0;
while (wadfiles[numwadfiles])
numwadfiles++;
new = malloc(strlen(file)+1);
strcpy(new, file);
wadfiles[numwadfiles] = new;
}
#if (APPVER_DOOMREV < AV_DR_DM19U)
#define DEVMAPS "e:/doom/"
#else
#define DEVMAPS "f:/doom/data_se/"
#endif
#define DEVDATA "c:/localid/"
/*
=================
=
= IdentifyVersion
=
= Checks availability of IWAD files by name,
= to determine whether registered/commercial features
= should be executed (notably loading PWAD's).
=================
*/
static void IdentifyVersion (void)
{
char *doom1wad, *doomwad, *doom2wad;
#if (APPVER_DOOMREV >= AV_DR_DM18FR)
#if (APPVER_DOOMREV < AV_DR_DM19F)
char *doom2fwad;
#else
char *doom2fwad, *plutoniawad, *tntwad;
#endif
#endif // AV_DR_DM18FR
strcpy(basedefault,"default.cfg");
doom1wad = "doom1.wad";
#if (APPVER_DOOMREV >= AV_DR_DM18FR)
doom2fwad = "doom2f.wad";
#endif
doom2wad = "doom2.wad";
#if (APPVER_DOOMREV >= AV_DR_DM19F)
plutoniawad = "plutonia.wad";
tntwad = "tnt.wad";
#endif
#if APPVER_CHEX
doomwad = "chex.wad";
#else
doomwad = "doom.wad";
#endif
if (M_CheckParm ("-shdev"))
{
registered = false;
shareware = true;
devparm = true;
D_AddFile (DEVDATA"doom1.wad");
#if (APPVER_DOOMREV < AV_DR_DM19U)
D_AddFile (DEVMAPS"data/texture1.lmp");
D_AddFile (DEVMAPS"data/pnames.lmp");
#else
D_AddFile (DEVMAPS"data_se/texture1.lmp");
D_AddFile (DEVMAPS"data_se/pnames.lmp");
#endif
strcpy (basedefault,DEVDATA"default.cfg");
return;
}
if (M_CheckParm ("-regdev"))
{
registered = true;
devparm = true;
#if APPVER_CHEX
D_AddFile (DEVDATA"chex.wad");
#else
D_AddFile (DEVDATA"doom.wad");
#endif
#if (APPVER_DOOMREV < AV_DR_DM19U)
D_AddFile (DEVMAPS"data/texture1.lmp");
D_AddFile (DEVMAPS"data/texture2.lmp");
D_AddFile (DEVMAPS"data/pnames.lmp");
#else
D_AddFile (DEVMAPS"data_se/texture1.lmp");
D_AddFile (DEVMAPS"data_se/texture2.lmp");
D_AddFile (DEVMAPS"data_se/pnames.lmp");
#endif
strcpy (basedefault,DEVDATA"default.cfg");
return;
}
if (M_CheckParm ("-comdev"))
{
commercial = true;
devparm = true;
#if (APPVER_DOOMREV >= AV_DR_DM19F)
if(plutonia)
D_AddFile (DEVDATA"plutonia.wad");
else if(tnt)
D_AddFile (DEVDATA"tnt.wad");
else
#endif
D_AddFile (DEVDATA"doom2.wad");
D_AddFile (DEVMAPS"cdata/texture1.lmp");
D_AddFile (DEVMAPS"cdata/pnames.lmp");
strcpy (basedefault,DEVDATA"default.cfg");
return;
}
#if (APPVER_DOOMREV >= AV_DR_DM18FR)
if ( !access (doom2fwad,R_OK) )
{
commercial = true;
// C'est ridicule!
// Let's handle languages in config files, okay?
french = true;
printf("French version\n");
D_AddFile (doom2fwad);
return;
}
#endif
if ( !access (doom2wad,R_OK) )
{
commercial = true;
D_AddFile (doom2wad);
return;
}
#if (APPVER_DOOMREV >= AV_DR_DM19F)
if ( !access (plutoniawad, R_OK ) )
{
commercial = true;
plutonia = true;
D_AddFile (plutoniawad);
return;
}
if ( !access (tntwad, R_OK ) )
{
commercial = true;
tnt = true;
D_AddFile (tntwad);
return;
}
#endif // APPVER_DOOMREV >= AV_DR_DM19F
if ( !access (doomwad, R_OK ) )
{
registered = true;
D_AddFile (doomwad);
return;
}
if ( !access (doom1wad, R_OK ) )
{
shareware = true;
D_AddFile (doom1wad);
return;
}
#if (APPVER_DOOMREV < AV_DR_DM18FR)
I_Error("Game mode indeterminate\n");
#else
printf("Game mode indeterminate.\n");
exit(1);
#endif
}
/*
=================
=
= Find a Response File
=
=================
*/
static void FindResponseFile (void)
{
int32_t i;
#define MAXARGVS 100
for (i = 1;i < myargc;i++)
if (myargv[i][0] == '@')
{
FILE *handle;
int32_t size;
int32_t k;
int32_t index;
int32_t indexinfile;
char *infile;
char *file;
char *moreargs[20];
char *firstargv;
// READ THE RESPONSE FILE INTO MEMORY
handle = fopen (&myargv[i][1],"rb");
if (!handle)
{
#if (APPVER_DOOMREV < AV_DR_DM1666)
I_Error ("No such response file!");
#else
printf ("\nNo such response file!");
exit(1);
#endif
}
printf("Found response file %s!\n",&myargv[i][1]);
fseek (handle,0,SEEK_END);
size = ftell(handle);
fseek (handle,0,SEEK_SET);
file = malloc (size);
fread (file,size,1,handle);
fclose (handle);
// KEEP ALL CMDLINE ARGS FOLLOWING @RESPONSEFILE ARG
for (index = 0,k = i+1; k < myargc; k++)
moreargs[index++] = myargv[k];
firstargv = myargv[0];
myargv = malloc(sizeof(char *)*MAXARGVS);
memset(myargv,0,sizeof(char *)*MAXARGVS);
myargv[0] = firstargv;
infile = file;
indexinfile = k = 0;
indexinfile++; // SKIP PAST ARGV[0] (KEEP IT)
do
{
myargv[indexinfile++] = infile+k;
while(k < size &&
((*(infile+k)>= ' '+1) && (*(infile+k)<='z')))
k++;
*(infile+k) = 0;
while(k < size &&
((*(infile+k)<= ' ') || (*(infile+k)>'z')))
k++;
} while(k < size);
for (k = 0;k < index;k++)
myargv[indexinfile++] = moreargs[k];
myargc = indexinfile;
// DISPLAY ARGS
printf("%d command-line args:\n",myargc);
for (k=1;k<myargc;k++)
printf("%s\n",myargv[k]);
break;
}
}
/*
=================
=
= D_DoomMain
=
=================
*/
void D_DoomMain (void)
{
union REGS regs;
int32_t p;
char file[256];
FindResponseFile ();
IdentifyVersion ();
setbuf (stdout, NULL);
modifiedgame = false;
nomonsters = M_CheckParm ("-nomonsters");
respawnparm = M_CheckParm ("-respawn");
fastparm = M_CheckParm ("-fast");
devparm = M_CheckParm ("-devparm");
#if !APPVER_CHEX
if (M_CheckParm ("-altdeath"))
deathmatch = 2;
else if (M_CheckParm ("-deathmatch"))
deathmatch = 1;
#endif
if (!commercial)
{
sprintf (title,
#if (APPVER_DOOMREV < AV_DR_DM17)
" "
"DOOM System Startup v%i.%i66"
" ",
#elif (APPVER_DOOMREV < AV_DR_DM19UP)
" "
"DOOM System Startup v%i.%i"
" ",
#elif (APPVER_DOOMREV < AV_DR_DM19U)
" "
"DOOM System Startup v%i.%i Special Edition"
" ",
#elif !APPVER_CHEX
" "
"The Ultimate DOOM Startup v%i.%i"
" ",
#else
" "
"Chex(R) Quest Startup"
" ",
#endif
VERSION/100,VERSION%100);
}