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g_game.c
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//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// 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.
//
// DESCRIPTION: none
//
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "doomdef.h"
#include "doomkeys.h"
#include "doomstat.h"
#include "deh_main.h"
#include "deh_misc.h"
#include "z_zone.h"
#include "f_finale.h"
#include "m_argv.h"
#include "m_controls.h"
#include "m_misc.h"
#include "m_menu.h"
#include "m_random.h"
#include "i_system.h"
#include "i_timer.h"
#include "i_video.h"
#include "p_setup.h"
#include "p_saveg.h"
#include "p_tick.h"
#include "d_main.h"
#include "wi_stuff.h"
#include "hu_stuff.h"
#include "st_stuff.h"
#include "am_map.h"
#include "statdump.h"
// Needs access to LFB.
#include "v_video.h"
#include "w_wad.h"
#include "p_local.h"
#include "s_sound.h"
// Data.
#include "dstrings.h"
#include "sounds.h"
// SKY handling - still the wrong place.
#include "r_data.h"
#include "r_sky.h"
#include "g_game.h"
#define SAVEGAMESIZE 0x2c000
void G_ReadDemoTiccmd (ticcmd_t* cmd);
void G_WriteDemoTiccmd (ticcmd_t* cmd);
void G_PlayerReborn (int player);
void G_DoReborn (int playernum);
void G_DoLoadLevel (void);
void G_DoNewGame (void);
void G_DoPlayDemo (void);
void G_DoCompleted (void);
void G_DoVictory (void);
void G_DoWorldDone (void);
void G_DoSaveGame (void);
// Gamestate the last time G_Ticker was called.
gamestate_t oldgamestate;
gameaction_t gameaction;
gamestate_t gamestate;
skill_t gameskill;
boolean respawnmonsters;
int gameepisode;
int gamemap;
// If non-zero, exit the level after this number of minutes.
int timelimit;
boolean paused;
boolean sendpause; // send a pause event next tic
boolean sendsave; // send a save event next tic
boolean usergame; // ok to save / end game
boolean timingdemo; // if true, exit with report on completion
boolean nodrawers; // for comparative timing purposes
int starttime; // for comparative timing purposes
boolean viewactive;
int deathmatch; // only if started as net death
boolean netgame; // only true if packets are broadcast
boolean playeringame[MAXPLAYERS];
player_t players[MAXPLAYERS];
boolean turbodetected[MAXPLAYERS];
int consoleplayer; // player taking events and displaying
int displayplayer; // view being displayed
int levelstarttic; // gametic at level start
int totalkills, totalitems, totalsecret; // for intermission
char *demoname;
boolean demorecording;
boolean longtics; // cph's doom 1.91 longtics hack
boolean lowres_turn; // low resolution turning for longtics
boolean demoplayback;
boolean netdemo;
byte* demobuffer;
byte* demo_p;
byte* demoend;
boolean singledemo; // quit after playing a demo from cmdline
boolean precache = true; // if true, load all graphics at start
boolean testcontrols = false; // Invoked by setup to test controls
int testcontrols_mousespeed;
wbstartstruct_t wminfo; // parms for world map / intermission
byte consistancy[MAXPLAYERS][BACKUPTICS];
#define MAXPLMOVE (forwardmove[1])
#define TURBOTHRESHOLD 0x32
fixed_t forwardmove[2] = {0x19, 0x32};
fixed_t sidemove[2] = {0x18, 0x28};
fixed_t angleturn[3] = {640, 1280, 320}; // + slow turn
static int *weapon_keys[] = {
&key_weapon1,
&key_weapon2,
&key_weapon3,
&key_weapon4,
&key_weapon5,
&key_weapon6,
&key_weapon7,
&key_weapon8
};
// Set to -1 or +1 to switch to the previous or next weapon.
static int next_weapon = 0;
// Used for prev/next weapon keys.
static const struct
{
weapontype_t weapon;
weapontype_t weapon_num;
} weapon_order_table[] = {
{ wp_fist, wp_fist },
{ wp_chainsaw, wp_fist },
{ wp_pistol, wp_pistol },
{ wp_shotgun, wp_shotgun },
{ wp_supershotgun, wp_shotgun },
{ wp_chaingun, wp_chaingun },
{ wp_missile, wp_missile },
{ wp_plasma, wp_plasma },
{ wp_bfg, wp_bfg }
};
#define SLOWTURNTICS 6
#define NUMKEYS 256
#define MAX_JOY_BUTTONS 20
static boolean gamekeydown[NUMKEYS];
static int turnheld; // for accelerative turning
static boolean mousearray[MAX_MOUSE_BUTTONS + 1];
static boolean *mousebuttons = &mousearray[1]; // allow [-1]
// mouse values are used once
int mousex;
int mousey;
static int dclicktime;
static boolean dclickstate;
static int dclicks;
static int dclicktime2;
static boolean dclickstate2;
static int dclicks2;
// joystick values are repeated
static int joyxmove;
static int joyymove;
static int joystrafemove;
static boolean joyarray[MAX_JOY_BUTTONS + 1];
static boolean *joybuttons = &joyarray[1]; // allow [-1]
static int savegameslot;
static char savedescription[32];
#define BODYQUESIZE 32
mobj_t* bodyque[BODYQUESIZE];
int bodyqueslot;
int vanilla_savegame_limit = 1;
int vanilla_demo_limit = 1;
int G_CmdChecksum (ticcmd_t* cmd)
{
size_t i;
int sum = 0;
for (i=0 ; i< sizeof(*cmd)/4 - 1 ; i++)
sum += ((int *)cmd)[i];
return sum;
}
static boolean WeaponSelectable(weapontype_t weapon)
{
// Can't select the super shotgun in Doom 1.
if (weapon == wp_supershotgun && logical_gamemission == doom)
{
return false;
}
// These weapons aren't available in shareware.
if ((weapon == wp_plasma || weapon == wp_bfg)
&& gamemission == doom && gamemode == shareware)
{
return false;
}
// Can't select a weapon if we don't own it.
if (!players[consoleplayer].weaponowned[weapon])
{
return false;
}
// Can't select the fist if we have the chainsaw, unless
// we also have the berserk pack.
if (weapon == wp_fist
&& players[consoleplayer].weaponowned[wp_chainsaw]
&& !players[consoleplayer].powers[pw_strength])
{
return false;
}
return true;
}
static int G_NextWeapon(int direction)
{
weapontype_t weapon;
int start_i, i;
// Find index in the table.
if (players[consoleplayer].pendingweapon == wp_nochange)
{
weapon = players[consoleplayer].readyweapon;
}
else
{
weapon = players[consoleplayer].pendingweapon;
}
for (i=0; i<arrlen(weapon_order_table); ++i)
{
if (weapon_order_table[i].weapon == weapon)
{
break;
}
}
// Switch weapon. Don't loop forever.
start_i = i;
do
{
i += direction;
i = (i + arrlen(weapon_order_table)) % arrlen(weapon_order_table);
} while (i != start_i && !WeaponSelectable(weapon_order_table[i].weapon));
return weapon_order_table[i].weapon_num;
}
//
// G_BuildTiccmd
// Builds a ticcmd from all of the available inputs
// or reads it from the demo buffer.
// If recording a demo, write it out
//
void G_BuildTiccmd (ticcmd_t* cmd, int maketic)
{
int i;
boolean strafe;
boolean bstrafe;
int speed;
int tspeed;
int forward;
int side;
memset(cmd, 0, sizeof(ticcmd_t));
cmd->consistancy =
consistancy[consoleplayer][maketic%BACKUPTICS];
strafe = gamekeydown[key_strafe] || mousebuttons[mousebstrafe]
|| joybuttons[joybstrafe];
// fraggle: support the old "joyb_speed = 31" hack which
// allowed an autorun effect
speed = key_speed >= NUMKEYS
|| joybspeed >= MAX_JOY_BUTTONS
|| gamekeydown[key_speed]
|| joybuttons[joybspeed];
forward = side = 0;
// use two stage accelerative turning
// on the keyboard and joystick
if (joyxmove < 0
|| joyxmove > 0
|| gamekeydown[key_right]
|| gamekeydown[key_left])
turnheld += ticdup;
else
turnheld = 0;
if (turnheld < SLOWTURNTICS)
tspeed = 2; // slow turn
else
tspeed = speed;
// let movement keys cancel each other out
if (strafe)
{
if (gamekeydown[key_right])
{
// fprintf(stderr, "strafe right\n");
side += sidemove[speed];
}
if (gamekeydown[key_left])
{
// fprintf(stderr, "strafe left\n");
side -= sidemove[speed];
}
if (joyxmove > 0)
side += sidemove[speed];
if (joyxmove < 0)
side -= sidemove[speed];
}
else
{
if (gamekeydown[key_right])
cmd->angleturn -= angleturn[tspeed];
if (gamekeydown[key_left])
cmd->angleturn += angleturn[tspeed];
if (joyxmove > 0)
cmd->angleturn -= angleturn[tspeed];
if (joyxmove < 0)
cmd->angleturn += angleturn[tspeed];
}
if (gamekeydown[key_up])
{
// fprintf(stderr, "up\n");
forward += forwardmove[speed];
}
if (gamekeydown[key_down])
{
// fprintf(stderr, "down\n");
forward -= forwardmove[speed];
}
if (joyymove < 0)
forward += forwardmove[speed];
if (joyymove > 0)
forward -= forwardmove[speed];
if (gamekeydown[key_strafeleft]
|| joybuttons[joybstrafeleft]
|| mousebuttons[mousebstrafeleft]
|| joystrafemove < 0)
{
side -= sidemove[speed];
}
if (gamekeydown[key_straferight]
|| joybuttons[joybstraferight]
|| mousebuttons[mousebstraferight]
|| joystrafemove > 0)
{
side += sidemove[speed];
}
// buttons
cmd->chatchar = HU_dequeueChatChar();
if (gamekeydown[key_fire] || mousebuttons[mousebfire]
|| joybuttons[joybfire])
cmd->buttons |= BT_ATTACK;
if (gamekeydown[key_use]
|| joybuttons[joybuse]
|| mousebuttons[mousebuse])
{
cmd->buttons |= BT_USE;
// clear double clicks if hit use button
dclicks = 0;
}
// If the previous or next weapon button is pressed, the
// next_weapon variable is set to change weapons when
// we generate a ticcmd. Choose a new weapon.
if (gamestate == GS_LEVEL && next_weapon != 0)
{
i = G_NextWeapon(next_weapon);
cmd->buttons |= BT_CHANGE;
cmd->buttons |= i << BT_WEAPONSHIFT;
}
else
{
// Check weapon keys.
for (i=0; i<arrlen(weapon_keys); ++i)
{
int key = *weapon_keys[i];
if (gamekeydown[key])
{
cmd->buttons |= BT_CHANGE;
cmd->buttons |= i<<BT_WEAPONSHIFT;
break;
}
}
}
next_weapon = 0;
// mouse
if (mousebuttons[mousebforward])
{
forward += forwardmove[speed];
}
if (mousebuttons[mousebbackward])
{
forward -= forwardmove[speed];
}
if (dclick_use)
{
// forward double click
if (mousebuttons[mousebforward] != dclickstate && dclicktime > 1 )
{
dclickstate = mousebuttons[mousebforward];
if (dclickstate)
dclicks++;
if (dclicks == 2)
{
cmd->buttons |= BT_USE;
dclicks = 0;
}
else
dclicktime = 0;
}
else
{
dclicktime += ticdup;
if (dclicktime > 20)
{
dclicks = 0;
dclickstate = 0;
}
}
// strafe double click
bstrafe =
mousebuttons[mousebstrafe]
|| joybuttons[joybstrafe];
if (bstrafe != dclickstate2 && dclicktime2 > 1 )
{
dclickstate2 = bstrafe;
if (dclickstate2)
dclicks2++;
if (dclicks2 == 2)
{
cmd->buttons |= BT_USE;
dclicks2 = 0;
}
else
dclicktime2 = 0;
}
else
{
dclicktime2 += ticdup;
if (dclicktime2 > 20)
{
dclicks2 = 0;
dclickstate2 = 0;
}
}
}
forward += mousey;
if (strafe)
side += mousex*2;
else
cmd->angleturn -= mousex*0x8;
if (mousex == 0)
{
// No movement in the previous frame
testcontrols_mousespeed = 0;
}
mousex = mousey = 0;
if (forward > MAXPLMOVE)
forward = MAXPLMOVE;
else if (forward < -MAXPLMOVE)
forward = -MAXPLMOVE;
if (side > MAXPLMOVE)
side = MAXPLMOVE;
else if (side < -MAXPLMOVE)
side = -MAXPLMOVE;
cmd->forwardmove += forward;
cmd->sidemove += side;
// special buttons
if (sendpause)
{
sendpause = false;
cmd->buttons = BT_SPECIAL | BTS_PAUSE;
}
if (sendsave)
{
sendsave = false;
cmd->buttons = BT_SPECIAL | BTS_SAVEGAME | (savegameslot<<BTS_SAVESHIFT);
}
// low-res turning
if (lowres_turn)
{
static signed short carry = 0;
signed short desired_angleturn;
desired_angleturn = cmd->angleturn + carry;
// round angleturn to the nearest 256 unit boundary
// for recording demos with single byte values for turn
cmd->angleturn = (desired_angleturn + 128) & 0xff00;
// Carry forward the error from the reduced resolution to the
// next tic, so that successive small movements can accumulate.
carry = desired_angleturn - cmd->angleturn;
}
}
//
// G_DoLoadLevel
//
void G_DoLoadLevel (void)
{
int i;
// Set the sky map.
// First thing, we have a dummy sky texture name,
// a flat. The data is in the WAD only because
// we look for an actual index, instead of simply
// setting one.
skyflatnum = R_FlatNumForName(DEH_String(SKYFLATNAME));
// The "Sky never changes in Doom II" bug was fixed in
// the id Anthology version of doom2.exe for Final Doom.
if ((gamemode == commercial)
&& (gameversion == exe_final2 || gameversion == exe_chex))
{
char *skytexturename;
if (gamemap < 12)
{
skytexturename = "SKY1";
}
else if (gamemap < 21)
{
skytexturename = "SKY2";
}
else
{
skytexturename = "SKY3";
}
skytexturename = DEH_String(skytexturename);
skytexture = R_TextureNumForName(skytexturename);
}
levelstarttic = gametic; // for time calculation
if (wipegamestate == GS_LEVEL)
wipegamestate = -1; // force a wipe
gamestate = GS_LEVEL;
for (i=0 ; i<MAXPLAYERS ; i++)
{
turbodetected[i] = false;
if (playeringame[i] && players[i].playerstate == PST_DEAD)
players[i].playerstate = PST_REBORN;
memset (players[i].frags,0,sizeof(players[i].frags));
}
P_SetupLevel (gameepisode, gamemap, 0, gameskill);
displayplayer = consoleplayer; // view the guy you are playing
gameaction = ga_nothing;
Z_CheckHeap ();
// clear cmd building stuff
memset (gamekeydown, 0, sizeof(gamekeydown));
joyxmove = joyymove = joystrafemove = 0;
mousex = mousey = 0;
sendpause = sendsave = paused = false;
memset(mousearray, 0, sizeof(mousearray));
memset(joyarray, 0, sizeof(joyarray));
if (testcontrols)
{
players[consoleplayer].message = "Press escape to quit.";
}
}
static void SetJoyButtons(unsigned int buttons_mask)
{
int i;
for (i=0; i<MAX_JOY_BUTTONS; ++i)
{
int button_on = (buttons_mask & (1 << i)) != 0;
// Detect button press:
if (!joybuttons[i] && button_on)
{
// Weapon cycling:
if (i == joybprevweapon)
{
next_weapon = -1;
}
else if (i == joybnextweapon)
{
next_weapon = 1;
}
}
joybuttons[i] = button_on;
}
}
static void SetMouseButtons(unsigned int buttons_mask)
{
int i;
for (i=0; i<MAX_MOUSE_BUTTONS; ++i)
{
unsigned int button_on = (buttons_mask & (1 << i)) != 0;
// Detect button press:
if (!mousebuttons[i] && button_on)
{
if (i == mousebprevweapon)
{
next_weapon = -1;
}
else if (i == mousebnextweapon)
{
next_weapon = 1;
}
}
mousebuttons[i] = button_on;
}
}
//
// G_Responder
// Get info needed to make ticcmd_ts for the players.
//
boolean G_Responder (event_t* ev)
{
// allow spy mode changes even during the demo
if (gamestate == GS_LEVEL && ev->type == ev_keydown
&& ev->data1 == key_spy && (singledemo || !deathmatch) )
{
// spy mode
do
{
displayplayer++;
if (displayplayer == MAXPLAYERS)
displayplayer = 0;
} while (!playeringame[displayplayer] && displayplayer != consoleplayer);
return true;
}
// any other key pops up menu if in demos
if (gameaction == ga_nothing && !singledemo &&
(demoplayback || gamestate == GS_DEMOSCREEN)
)
{
if (ev->type == ev_keydown ||
(ev->type == ev_mouse && ev->data1) ||
(ev->type == ev_joystick && ev->data1) )
{
M_StartControlPanel ();
return true;
}
return false;
}
if (gamestate == GS_LEVEL)
{
#if 0
if (devparm && ev->type == ev_keydown && ev->data1 == ';')
{
G_DeathMatchSpawnPlayer (0);
return true;
}
#endif
if (HU_Responder (ev))
return true; // chat ate the event
if (ST_Responder (ev))
return true; // status window ate it
if (AM_Responder (ev))
return true; // automap ate it
}
if (gamestate == GS_FINALE)
{
if (F_Responder (ev))
return true; // finale ate the event
}
if (testcontrols && ev->type == ev_mouse)
{
// If we are invoked by setup to test the controls, save the
// mouse speed so that we can display it on-screen.
// Perform a low pass filter on this so that the thermometer
// appears to move smoothly.
testcontrols_mousespeed = abs(ev->data2);
}
// If the next/previous weapon keys are pressed, set the next_weapon
// variable to change weapons when the next ticcmd is generated.
if (ev->type == ev_keydown && ev->data1 == key_prevweapon)
{
next_weapon = -1;
}
else if (ev->type == ev_keydown && ev->data1 == key_nextweapon)
{
next_weapon = 1;
}
switch (ev->type)
{
case ev_keydown:
if (ev->data1 == key_pause)
{
sendpause = true;
}
else if (ev->data1 <NUMKEYS)
{
gamekeydown[ev->data1] = true;
}
return true; // eat key down events
case ev_keyup:
if (ev->data1 <NUMKEYS)
gamekeydown[ev->data1] = false;
return false; // always let key up events filter down
case ev_mouse:
SetMouseButtons(ev->data1);
mousex = ev->data2*(mouseSensitivity+5)/10;
mousey = ev->data3*(mouseSensitivity+5)/10;
return true; // eat events
case ev_joystick:
SetJoyButtons(ev->data1);
joyxmove = ev->data2;
joyymove = ev->data3;
joystrafemove = ev->data4;
return true; // eat events
default:
break;
}
return false;
}
//
// G_Ticker
// Make ticcmd_ts for the players.
//
void G_Ticker (void)
{
int i;
int buf;
ticcmd_t* cmd;
// do player reborns if needed
for (i=0 ; i<MAXPLAYERS ; i++)
if (playeringame[i] && players[i].playerstate == PST_REBORN)
G_DoReborn (i);
// do things to change the game state
while (gameaction != ga_nothing)
{
switch (gameaction)
{
case ga_loadlevel:
G_DoLoadLevel ();
break;
case ga_newgame:
G_DoNewGame ();
break;
case ga_loadgame:
G_DoLoadGame ();
break;
case ga_savegame:
G_DoSaveGame ();
break;
case ga_playdemo:
G_DoPlayDemo ();
break;
case ga_completed:
G_DoCompleted ();
break;
case ga_victory:
F_StartFinale ();
break;
case ga_worlddone:
G_DoWorldDone ();
break;
case ga_screenshot:
V_ScreenShot("DOOM%02i.%s");
players[consoleplayer].message = DEH_String("screen shot");
gameaction = ga_nothing;
break;
case ga_nothing:
break;
}
}
// get commands, check consistancy,
// and build new consistancy check
buf = (gametic/ticdup)%BACKUPTICS;
for (i=0 ; i<MAXPLAYERS ; i++)
{
if (playeringame[i])
{
cmd = &players[i].cmd;
memcpy(cmd, &netcmds[i], sizeof(ticcmd_t));
if (demoplayback)
G_ReadDemoTiccmd (cmd);
if (demorecording)
G_WriteDemoTiccmd (cmd);
// check for turbo cheats
// check ~ 4 seconds whether to display the turbo message.
// store if the turbo threshold was exceeded in any tics
// over the past 4 seconds. offset the checking period
// for each player so messages are not displayed at the
// same time.
if (cmd->forwardmove > TURBOTHRESHOLD)
{
turbodetected[i] = true;
}
if ((gametic & 31) == 0
&& ((gametic >> 5) % MAXPLAYERS) == i
&& turbodetected[i])
{
static char turbomessage[80];
extern char *player_names[4];
M_snprintf(turbomessage, sizeof(turbomessage),
"%s is turbo!", player_names[i]);
players[consoleplayer].message = turbomessage;
turbodetected[i] = false;
}
if (netgame && !netdemo && !(gametic%ticdup) )
{
if (gametic > BACKUPTICS
&& consistancy[i][buf] != cmd->consistancy)
{
I_Error ("consistency failure (%i should be %i)",
cmd->consistancy, consistancy[i][buf]);
}
if (players[i].mo)
consistancy[i][buf] = players[i].mo->x;
else
consistancy[i][buf] = rndindex;
}
}
}
// check for special buttons
for (i=0 ; i<MAXPLAYERS ; i++)
{
if (playeringame[i])
{
if (players[i].cmd.buttons & BT_SPECIAL)
{
switch (players[i].cmd.buttons & BT_SPECIALMASK)
{
case BTS_PAUSE:
paused ^= 1;
if (paused)
S_PauseSound ();
else
S_ResumeSound ();
break;
case BTS_SAVEGAME:
if (!savedescription[0])
{
M_StringCopy(savedescription, "NET GAME",
sizeof(savedescription));
}
savegameslot =
(players[i].cmd.buttons & BTS_SAVEMASK)>>BTS_SAVESHIFT;
gameaction = ga_savegame;
break;
}
}
}
}
// Have we just finished displaying an intermission screen?
if (oldgamestate == GS_INTERMISSION && gamestate != GS_INTERMISSION)
{
WI_End();
}