ref: afb95216afb043a56122a3f57292bf0ded5d7775
dir: /src/d_net.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 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.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
// DOOM Network game communication and protocol,
// all OS independend parts.
//
//-----------------------------------------------------------------------------
#include "doomfeatures.h"
#include "d_main.h"
#include "m_argv.h"
#include "m_menu.h"
#include "i_system.h"
#include "i_timer.h"
#include "i_video.h"
#include "g_game.h"
#include "doomdef.h"
#include "doomstat.h"
#include "deh_main.h"
#include "net_client.h"
#include "net_gui.h"
#include "net_io.h"
#include "net_query.h"
#include "net_server.h"
#include "net_sdl.h"
#include "net_loop.h"
//
// NETWORKING
//
// gametic is the tic about to (or currently being) run
// maketic is the tick that hasn't had control made for it yet
// nettics[] has the maketics for all players
//
// a gametic cannot be run until nettics[] > gametic for all players
//
ticcmd_t netcmds[MAXPLAYERS][BACKUPTICS];
int nettics[MAXPLAYERS];
int maketic;
// Used for original sync code.
int lastnettic;
int skiptics = 0;
// Reduce the bandwidth needed by sampling game input less and transmitting
// less. If ticdup is 2, sample half normal, 3 = one third normal, etc.
int ticdup;
// Send this many extra (backup) tics in each packet.
int extratics;
// Amount to offset the timer for game sync.
fixed_t offsetms;
// Use new client syncronisation code
boolean net_cl_new_sync = true;
// Connected but not participating in the game (observer)
boolean drone = false;
// 35 fps clock adjusted by offsetms milliseconds
static int GetAdjustedTime(void)
{
int time_ms;
time_ms = I_GetTimeMS();
if (net_cl_new_sync)
{
// Use the adjustments from net_client.c only if we are
// using the new sync mode.
time_ms += (offsetms / FRACUNIT);
}
return (time_ms * TICRATE) / 1000;
}
//
// NetUpdate
// Builds ticcmds for console player,
// sends out a packet
//
int lasttime;
void NetUpdate (void)
{
int nowtime;
int newtics;
int i;
int gameticdiv;
// If we are running with singletics (timing a demo), this
// is all done separately.
if (singletics)
return;
#ifdef FEATURE_MULTIPLAYER
// Run network subsystems
NET_CL_Run();
NET_SV_Run();
#endif
// check time
nowtime = GetAdjustedTime() / ticdup;
newtics = nowtime - lasttime;
lasttime = nowtime;
if (skiptics <= newtics)
{
newtics -= skiptics;
skiptics = 0;
}
else
{
skiptics -= newtics;
newtics = 0;
}
// build new ticcmds for console player
gameticdiv = gametic/ticdup;
for (i=0 ; i<newtics ; i++)
{
ticcmd_t cmd;
I_StartTic ();
D_ProcessEvents ();
// Always run the menu
M_Ticker ();
if (drone)
{
// In drone mode, do not generate any ticcmds.
continue;
}
if (net_cl_new_sync)
{
// If playing single player, do not allow tics to buffer
// up very far
if ((!netgame || demoplayback) && maketic - gameticdiv > 2)
break;
// Never go more than ~200ms ahead
if (maketic - gameticdiv > 8)
break;
}
else
{
if (maketic - gameticdiv >= 5)
break;
}
//printf ("mk:%i ",maketic);
G_BuildTiccmd(&cmd);
#ifdef FEATURE_MULTIPLAYER
if (netgame && !demoplayback)
{
NET_CL_SendTiccmd(&cmd, maketic);
}
#endif
netcmds[consoleplayer][maketic % BACKUPTICS] = cmd;
++maketic;
nettics[consoleplayer] = maketic;
}
}
//
// Start game loop
//
// Called after the screen is set but before the game starts running.
//
void D_StartGameLoop(void)
{
lasttime = GetAdjustedTime() / ticdup;
}
//
// D_CheckNetGame
// Works out player numbers among the net participants
//
extern int viewangleoffset;
void D_CheckNetGame (void)
{
int i;
int num_players;
// default values for single player
consoleplayer = 0;
netgame = false;
ticdup = 1;
extratics = 1;
lowres_turn = false;
offsetms = 0;
for (i=0; i<MAXPLAYERS; i++)
{
playeringame[i] = false;
nettics[i] = 0;
}
playeringame[0] = true;
#ifdef FEATURE_MULTIPLAYER
{
net_addr_t *addr = NULL;
//!
// @category net
//
// Start a multiplayer server, listening for connections.
//
if (M_CheckParm("-server") > 0)
{
NET_SV_Init();
NET_SV_AddModule(&net_loop_server_module);
NET_SV_AddModule(&net_sdl_module);
net_loop_client_module.InitClient();
addr = net_loop_client_module.ResolveAddress(NULL);
}
else
{
//!
// @category net
//
// Automatically search the local LAN for a multiplayer
// server and join it.
//
i = M_CheckParm("-autojoin");
if (i > 0)
{
addr = NET_FindLANServer();
if (addr == NULL)
{
I_Error("No server found on local LAN");
}
}
//!
// @arg <address>
// @category net
//
// Connect to a multiplayer server running on the given
// address.
//
i = M_CheckParm("-connect");
if (i > 0)
{
net_sdl_module.InitClient();
addr = net_sdl_module.ResolveAddress(myargv[i+1]);
if (addr == NULL)
{
I_Error("Unable to resolve '%s'\n", myargv[i+1]);
}
}
}
if (addr != NULL)
{
if (M_CheckParm("-drone") > 0)
{
drone = true;
}
//!
// @category net
//
// Run as the left screen in three screen mode.
//
if (M_CheckParm("-left") > 0)
{
viewangleoffset = ANG90;
drone = true;
}
//!
// @category net
//
// Run as the right screen in three screen mode.
//
if (M_CheckParm("-right") > 0)
{
viewangleoffset = ANG270;
drone = true;
}
if (!NET_CL_Connect(addr))
{
I_Error("D_CheckNetGame: Failed to connect to %s\n",
NET_AddrToString(addr));
}
printf("D_CheckNetGame: Connected to %s\n", NET_AddrToString(addr));
NET_WaitForStart();
}
}
#endif
num_players = 0;
for (i=0; i<MAXPLAYERS; ++i)
{
if (playeringame[i])
++num_players;
}
printf (DEH_String("startskill %i deathmatch: %i startmap: %i startepisode: %i\n"),
startskill, deathmatch, startmap, startepisode);
printf(DEH_String("player %i of %i (%i nodes)\n"),
consoleplayer+1, num_players, num_players);
// Show players here; the server might have specified a time limit
if (timelimit > 0)
{
printf(DEH_String("Levels will end after %d minute"),timelimit);
if (timelimit > 1)
printf("s");
printf(".\n");
}
}
//
// D_QuitNetGame
// Called before quitting to leave a net game
// without hanging the other players
//
void D_QuitNetGame (void)
{
if (debugfile)
fclose (debugfile);
#ifdef FEATURE_MULTIPLAYER
NET_SV_Shutdown();
NET_CL_Disconnect();
#endif
}
// Returns true if there are currently any players in the game.
static boolean PlayersInGame(void)
{
int i;
for (i=0; i<MAXPLAYERS; ++i)
{
if (playeringame[i])
{
return true;
}
}
return false;
}
static int GetLowTic(void)
{
int i;
int lowtic;
#ifdef FEATURE_MULTIPLAYER
if (net_client_connected)
{
lowtic = INT_MAX;
for (i=0; i<MAXPLAYERS; ++i)
{
if (playeringame[i])
{
if (nettics[i] < lowtic)
lowtic = nettics[i];
}
}
}
else
#endif
{
lowtic = maketic;
}
return lowtic;
}
//
// TryRunTics
//
int oldnettics;
int frametics[4];
int frameon;
int frameskip[4];
int oldnettics;
extern boolean advancedemo;
void TryRunTics (void)
{
int i;
int lowtic;
int entertic;
static int oldentertics;
int realtics;
int availabletics;
int counts;
// get real tics
entertic = I_GetTime() / ticdup;
realtics = entertic - oldentertics;
oldentertics = entertic;
// get available tics
NetUpdate ();
lowtic = GetLowTic();
availabletics = lowtic - gametic/ticdup;
// decide how many tics to run
if (net_cl_new_sync)
{
counts = availabletics;
}
else
{
// decide how many tics to run
if (realtics < availabletics-1)
counts = realtics+1;
else if (realtics < availabletics)
counts = realtics;
else
counts = availabletics;
if (counts < 1)
counts = 1;
frameon++;
if (!demoplayback)
{
int keyplayer = -1;
// ideally maketic should be 1 - 3 tics above lowtic
// if we are consistantly slower, speed up time
for (i=0 ; i<MAXPLAYERS ; i++)
{
if (playeringame[i])
{
keyplayer = i;
break;
}
}
if (keyplayer < 0)
{
// If there are no players, we can never advance anyway
return;
}
if (consoleplayer == keyplayer)
{
// the key player does not adapt
}
else
{
if (maketic <= nettics[keyplayer])
{
lasttime--;
// printf ("-");
}
frameskip[frameon & 3] = (oldnettics > nettics[keyplayer]);
oldnettics = maketic;
if (frameskip[0] && frameskip[1] && frameskip[2] && frameskip[3])
{
skiptics = 1;
// printf ("+");
}
}
}
}
if (counts < 1)
counts = 1;
// wait for new tics if needed
while (!PlayersInGame() || lowtic < gametic/ticdup + counts)
{
NetUpdate ();
lowtic = GetLowTic();
if (lowtic < gametic/ticdup)
I_Error ("TryRunTics: lowtic < gametic");
// Don't stay in this loop forever. The menu is still running,
// so return to update the screen
if (I_GetTime() / ticdup - entertic > 0)
{
return;
}
I_Sleep(1);
}
// run the count * ticdup dics
while (counts--)
{
for (i=0 ; i<ticdup ; i++)
{
// check that there are players in the game. if not, we cannot
// run a tic.
if (!PlayersInGame())
{
return;
}
if (gametic/ticdup > lowtic)
I_Error ("gametic>lowtic");
if (advancedemo)
D_DoAdvanceDemo ();
G_Ticker ();
gametic++;
// modify command for duplicated tics
if (i != ticdup-1)
{
ticcmd_t *cmd;
int buf;
int j;
buf = (gametic/ticdup)%BACKUPTICS;
for (j=0 ; j<MAXPLAYERS ; j++)
{
cmd = &netcmds[j][buf];
cmd->chatchar = 0;
if (cmd->buttons & BT_SPECIAL)
cmd->buttons = 0;
}
}
}
NetUpdate (); // check for new console commands
}
}