760 lines
16 KiB
C
760 lines
16 KiB
C
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// DOOM Network game communication and protocol,
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// all OS independend parts.
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//
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//-----------------------------------------------------------------------------
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static const char rcsid[] = "$Id: d_net.c,v 1.3 1997/02/03 22:01:47 b1 Exp $";
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#include "m_menu.h"
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#include "i_system.h"
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#include "i_video.h"
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#include "i_net.h"
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#include "g_game.h"
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#include "doomdef.h"
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#include "doomstat.h"
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#define NCMD_EXIT 0x80000000
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#define NCMD_RETRANSMIT 0x40000000
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#define NCMD_SETUP 0x20000000
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#define NCMD_KILL 0x10000000 // kill game
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#define NCMD_CHECKSUM 0x0fffffff
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doomcom_t* doomcom;
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doomdata_t* netbuffer; // points inside doomcom
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//
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// NETWORKING
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//
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// gametic is the tic about to (or currently being) run
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// maketic is the tick that hasn't had control made for it yet
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// nettics[] has the maketics for all players
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//
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// a gametic cannot be run until nettics[] > gametic for all players
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//
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#define RESENDCOUNT 10
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#define PL_DRONE 0x80 // bit flag in doomdata->player
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ticcmd_t localcmds[BACKUPTICS];
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ticcmd_t netcmds[MAXPLAYERS][BACKUPTICS];
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int nettics[MAXNETNODES];
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boolean nodeingame[MAXNETNODES]; // set false as nodes leave game
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boolean remoteresend[MAXNETNODES]; // set when local needs tics
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int resendto[MAXNETNODES]; // set when remote needs tics
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int resendcount[MAXNETNODES];
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int nodeforplayer[MAXPLAYERS];
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int maketic;
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int lastnettic;
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int skiptics;
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int ticdup;
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int maxsend; // BACKUPTICS/(2*ticdup)-1
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void D_ProcessEvents (void);
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void G_BuildTiccmd (ticcmd_t *cmd);
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void D_DoAdvanceDemo (void);
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boolean reboundpacket;
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doomdata_t reboundstore;
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//
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//
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//
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int NetbufferSize (void)
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{
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return (int)&(((doomdata_t *)0)->cmds[netbuffer->numtics]);
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}
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//
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// Checksum
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//
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unsigned NetbufferChecksum (void)
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{
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unsigned c;
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int i,l;
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c = 0x1234567;
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// FIXME -endianess?
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#ifdef NORMALUNIX
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return 0; // byte order problems
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#endif
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l = (NetbufferSize () - (int)&(((doomdata_t *)0)->retransmitfrom))/4;
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for (i=0 ; i<l ; i++)
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c += ((unsigned *)&netbuffer->retransmitfrom)[i] * (i+1);
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return c & NCMD_CHECKSUM;
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}
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//
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//
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//
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int ExpandTics (int low)
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{
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int delta;
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delta = low - (maketic&0xff);
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if (delta >= -64 && delta <= 64)
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return (maketic&~0xff) + low;
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if (delta > 64)
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return (maketic&~0xff) - 256 + low;
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if (delta < -64)
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return (maketic&~0xff) + 256 + low;
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I_Error ("ExpandTics: strange value %i at maketic %i",low,maketic);
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return 0;
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}
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//
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// HSendPacket
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//
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void
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HSendPacket
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(int node,
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int flags )
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{
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netbuffer->checksum = NetbufferChecksum () | flags;
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if (!node)
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{
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reboundstore = *netbuffer;
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reboundpacket = true;
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return;
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}
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if (demoplayback)
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return;
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if (!netgame)
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I_Error ("Tried to transmit to another node");
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doomcom->command = CMD_SEND;
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doomcom->remotenode = node;
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doomcom->datalength = NetbufferSize ();
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#if 0 // AJH HACK
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if (debugfile)
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{
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int i;
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int realretrans;
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if (netbuffer->checksum & NCMD_RETRANSMIT)
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realretrans = ExpandTics (netbuffer->retransmitfrom);
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else
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realretrans = -1;
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I_DBGprintf("send (%i + %i, R %i) [%i] ",
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ExpandTics(netbuffer->starttic),
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netbuffer->numtics, realretrans, doomcom->datalength);
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for (i=0 ; i<doomcom->datalength ; i++)
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I_DBGprintf("%i ",((byte *)netbuffer)[i]);
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I_DBGprintf("\n");
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}
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#endif
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I_NetCmd ();
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}
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//
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// HGetPacket
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// Returns false if no packet is waiting
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//
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boolean HGetPacket (void)
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{
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if (reboundpacket)
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{
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*netbuffer = reboundstore;
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doomcom->remotenode = 0;
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reboundpacket = false;
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return true;
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}
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if (!netgame)
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return false;
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if (demoplayback)
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return false;
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doomcom->command = CMD_GET;
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I_NetCmd ();
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if (doomcom->remotenode == -1)
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return false;
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if (doomcom->datalength != NetbufferSize ())
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{
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I_DBGprintf("bad packet length %i\n",doomcom->datalength);
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return false;
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}
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if (NetbufferChecksum () != (netbuffer->checksum&NCMD_CHECKSUM) )
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{
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I_DBGprintf("bad packet checksum\n");
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return false;
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}
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#if 0 // AJH uGFX Hack
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if (debugfile)
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{
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int realretrans;
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int i;
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if (netbuffer->checksum & NCMD_SETUP)
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I_DBGprintf("setup packet\n");
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else
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{
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if (netbuffer->checksum & NCMD_RETRANSMIT)
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realretrans = ExpandTics (netbuffer->retransmitfrom);
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else
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realretrans = -1;
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I_DBGprintf("get %i = (%i + %i, R %i)[%i] ",
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doomcom->remotenode,
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ExpandTics(netbuffer->starttic),
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netbuffer->numtics, realretrans, doomcom->datalength);
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for (i=0 ; i<doomcom->datalength ; i++)
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I_DBGprintf("%i ",((byte *)netbuffer)[i]);
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I_DBGprintf("\n");
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}
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}
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#endif
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return true;
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}
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//
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// GetPackets
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//
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char exitmsg[80];
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void GetPackets (void)
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{
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int netconsole;
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int netnode;
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ticcmd_t *src, *dest;
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int realend;
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int realstart;
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while ( HGetPacket() )
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{
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if (netbuffer->checksum & NCMD_SETUP)
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continue; // extra setup packet
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netconsole = netbuffer->player & ~PL_DRONE;
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netnode = doomcom->remotenode;
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// to save bytes, only the low byte of tic numbers are sent
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// Figure out what the rest of the bytes are
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realstart = ExpandTics (netbuffer->starttic);
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realend = (realstart+netbuffer->numtics);
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// check for exiting the game
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if (netbuffer->checksum & NCMD_EXIT)
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{
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if (!nodeingame[netnode])
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continue;
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nodeingame[netnode] = false;
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playeringame[netconsole] = false;
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strcpy (exitmsg, "Player 1 left the game");
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exitmsg[7] += netconsole;
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players[consoleplayer].message = exitmsg;
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if (demorecording)
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G_CheckDemoStatus ();
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continue;
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}
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// check for a remote game kill
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if (netbuffer->checksum & NCMD_KILL)
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I_Error ("Killed by network driver");
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nodeforplayer[netconsole] = netnode;
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// check for retransmit request
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if ( resendcount[netnode] <= 0
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&& (netbuffer->checksum & NCMD_RETRANSMIT) )
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{
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resendto[netnode] = ExpandTics(netbuffer->retransmitfrom);
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I_DBGprintf ("retransmit from %i\n", resendto[netnode]);
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resendcount[netnode] = RESENDCOUNT;
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}
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else
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resendcount[netnode]--;
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// check for out of order / duplicated packet
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if (realend == nettics[netnode])
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continue;
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if (realend < nettics[netnode])
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{
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I_DBGprintf ("out of order packet (%i + %i)\n" ,
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realstart,netbuffer->numtics);
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continue;
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}
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// check for a missed packet
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if (realstart > nettics[netnode])
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{
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// stop processing until the other system resends the missed tics
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I_DBGprintf("missed tics from %i (%i - %i)\n",
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netnode, realstart, nettics[netnode]);
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remoteresend[netnode] = true;
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continue;
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}
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// update command store from the packet
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{
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int start;
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remoteresend[netnode] = false;
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start = nettics[netnode] - realstart;
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src = &netbuffer->cmds[start];
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while (nettics[netnode] < realend)
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{
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dest = &netcmds[netconsole][nettics[netnode]%BACKUPTICS];
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nettics[netnode]++;
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*dest = *src;
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src++;
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}
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}
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}
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}
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//
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// NetUpdate
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// Builds ticcmds for console player,
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// sends out a packet
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//
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int gametime;
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void NetUpdate (void)
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{
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int nowtime;
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int newtics;
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int i,j;
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int realstart;
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int gameticdiv;
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// check time
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nowtime = I_GetTime ()/ticdup;
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newtics = nowtime - gametime;
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gametime = nowtime;
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if (newtics <= 0) // nothing new to update
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goto listen;
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if (skiptics <= newtics)
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{
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newtics -= skiptics;
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skiptics = 0;
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}
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else
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{
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skiptics -= newtics;
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newtics = 0;
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}
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netbuffer->player = consoleplayer;
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// build new ticcmds for console player
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gameticdiv = gametic/ticdup;
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for (i=0 ; i<newtics ; i++)
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{
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I_StartTic ();
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D_ProcessEvents ();
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if (maketic - gameticdiv >= BACKUPTICS/2-1)
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break; // can't hold any more
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//I_printf("mk:%i ",maketic);
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G_BuildTiccmd (&localcmds[maketic%BACKUPTICS]);
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maketic++;
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}
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if (singletics)
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return; // singletic update is syncronous
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// send the packet to the other nodes
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for (i=0 ; i<doomcom->numnodes ; i++)
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if (nodeingame[i])
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{
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netbuffer->starttic = realstart = resendto[i];
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netbuffer->numtics = maketic - realstart;
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if (netbuffer->numtics > BACKUPTICS)
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I_Error ("NetUpdate: netbuffer->numtics > BACKUPTICS");
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resendto[i] = maketic - doomcom->extratics;
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for (j=0 ; j< netbuffer->numtics ; j++)
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netbuffer->cmds[j] =
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localcmds[(realstart+j)%BACKUPTICS];
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if (remoteresend[i])
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{
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netbuffer->retransmitfrom = nettics[i];
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HSendPacket (i, NCMD_RETRANSMIT);
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}
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else
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{
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netbuffer->retransmitfrom = 0;
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HSendPacket (i, 0);
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}
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}
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// listen for other packets
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listen:
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GetPackets ();
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}
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//
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// CheckAbort
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//
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void CheckAbort (void)
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{
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event_t *ev;
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int stoptic;
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stoptic = I_GetTime () + 2;
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while (I_GetTime() < stoptic)
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I_StartTic ();
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I_StartTic ();
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for ( ; eventtail != eventhead
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; eventtail = (++eventtail)&(MAXEVENTS-1) )
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{
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ev = &events[eventtail];
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if (ev->type == ev_keydown && ev->data1 == KEY_ESCAPE)
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I_Error ("Network game synchronization aborted.");
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}
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}
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//
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// D_ArbitrateNetStart
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//
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void D_ArbitrateNetStart (void)
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{
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int i;
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boolean gotinfo[MAXNETNODES];
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autostart = true;
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memset (gotinfo,0,sizeof(gotinfo));
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if (doomcom->consoleplayer)
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{
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// listen for setup info from key player
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I_printf ("listening for network start info...\n");
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while (1)
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{
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CheckAbort ();
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if (!HGetPacket ())
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continue;
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if (netbuffer->checksum & NCMD_SETUP)
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{
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if (netbuffer->player != VERSION)
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I_Error ("Different DOOM versions cannot play a net game!");
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startskill = netbuffer->retransmitfrom & 15;
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deathmatch = (netbuffer->retransmitfrom & 0xc0) >> 6;
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nomonsters = (netbuffer->retransmitfrom & 0x20) > 0;
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respawnparm = (netbuffer->retransmitfrom & 0x10) > 0;
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startmap = netbuffer->starttic & 0x3f;
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startepisode = netbuffer->starttic >> 6;
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return;
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}
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}
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}
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else
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{
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// key player, send the setup info
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I_printf ("sending network start info...\n");
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do
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{
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CheckAbort ();
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for (i=0 ; i<doomcom->numnodes ; i++)
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{
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netbuffer->retransmitfrom = startskill;
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if (deathmatch)
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netbuffer->retransmitfrom |= (deathmatch<<6);
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if (nomonsters)
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netbuffer->retransmitfrom |= 0x20;
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if (respawnparm)
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netbuffer->retransmitfrom |= 0x10;
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netbuffer->starttic = startepisode * 64 + startmap;
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netbuffer->player = VERSION;
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netbuffer->numtics = 0;
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HSendPacket (i, NCMD_SETUP);
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}
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#if 1
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for(i = 10 ; i && HGetPacket(); --i)
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{
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if((netbuffer->player&0x7f) < MAXNETNODES)
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gotinfo[netbuffer->player&0x7f] = true;
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}
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#else
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while (HGetPacket ())
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{
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gotinfo[netbuffer->player&0x7f] = true;
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}
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#endif
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for (i=1 ; i<doomcom->numnodes ; i++)
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if (!gotinfo[i])
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break;
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} while (i < doomcom->numnodes);
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}
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}
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//
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// D_CheckNetGame
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// Works out player numbers among the net participants
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//
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extern int viewangleoffset;
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void D_CheckNetGame (void)
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{
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int i;
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for (i=0 ; i<MAXNETNODES ; i++)
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{
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nodeingame[i] = false;
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nettics[i] = 0;
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remoteresend[i] = false; // set when local needs tics
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resendto[i] = 0; // which tic to start sending
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}
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// I_InitNetwork sets doomcom and netgame
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I_InitNetwork ();
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if (doomcom->id != DOOMCOM_ID)
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I_Error ("Doomcom buffer invalid!");
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netbuffer = &doomcom->data;
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consoleplayer = displayplayer = doomcom->consoleplayer;
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if (netgame)
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D_ArbitrateNetStart ();
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I_printf ("startskill %i deathmatch: %i startmap: %i startepisode: %i\n",
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startskill, deathmatch, startmap, startepisode);
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// read values out of doomcom
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ticdup = doomcom->ticdup;
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maxsend = BACKUPTICS/(2*ticdup)-1;
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if (maxsend<1)
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maxsend = 1;
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for (i=0 ; i<doomcom->numplayers ; i++)
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playeringame[i] = true;
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for (i=0 ; i<doomcom->numnodes ; i++)
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nodeingame[i] = true;
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I_printf ("player %i of %i (%i nodes)\n",
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consoleplayer+1, doomcom->numplayers, doomcom->numnodes);
|
|
|
|
}
|
|
|
|
|
|
//
|
|
// D_QuitNetGame
|
|
// Called before quitting to leave a net game
|
|
// without hanging the other players
|
|
//
|
|
void D_QuitNetGame (void)
|
|
{
|
|
int i, j;
|
|
|
|
if (!netgame || !usergame || consoleplayer == -1 || demoplayback)
|
|
return;
|
|
|
|
// send a bunch of packets for security
|
|
netbuffer->player = consoleplayer;
|
|
netbuffer->numtics = 0;
|
|
for (i=0 ; i<4 ; i++)
|
|
{
|
|
for (j=1 ; j<doomcom->numnodes ; j++)
|
|
if (nodeingame[j])
|
|
HSendPacket (j, NCMD_EXIT);
|
|
I_WaitVBL (1);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//
|
|
// TryRunTics
|
|
//
|
|
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;
|
|
int numplaying;
|
|
|
|
// get real tics
|
|
entertic = I_GetTime ()/ticdup;
|
|
realtics = entertic - oldentertics;
|
|
oldentertics = entertic;
|
|
|
|
// get available tics
|
|
NetUpdate ();
|
|
|
|
lowtic = MAXINT;
|
|
numplaying = 0;
|
|
for (i=0 ; i<doomcom->numnodes ; i++)
|
|
{
|
|
if (nodeingame[i])
|
|
{
|
|
numplaying++;
|
|
if (nettics[i] < lowtic)
|
|
lowtic = nettics[i];
|
|
}
|
|
}
|
|
availabletics = lowtic - gametic/ticdup;
|
|
|
|
// 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++;
|
|
|
|
I_DBGprintf("=======real: %i avail: %i game: %i\n",
|
|
realtics, availabletics,counts);
|
|
|
|
if (!demoplayback)
|
|
{
|
|
// ideally nettics[0] should be 1 - 3 tics above lowtic
|
|
// if we are consistantly slower, speed up time
|
|
for (i=0 ; i<MAXPLAYERS ; i++)
|
|
if (playeringame[i])
|
|
break;
|
|
if (consoleplayer == i)
|
|
{
|
|
// the key player does not adapt
|
|
}
|
|
else
|
|
{
|
|
if (nettics[0] <= nettics[nodeforplayer[i]])
|
|
{
|
|
gametime--;
|
|
// I_printf ("-");
|
|
}
|
|
frameskip[frameon&3] = (oldnettics > nettics[nodeforplayer[i]]);
|
|
oldnettics = nettics[0];
|
|
if (frameskip[0] && frameskip[1] && frameskip[2] && frameskip[3])
|
|
{
|
|
skiptics = 1;
|
|
// I_printf ("+");
|
|
}
|
|
}
|
|
}// demoplayback
|
|
|
|
// wait for new tics if needed
|
|
while (lowtic < gametic/ticdup + counts)
|
|
{
|
|
NetUpdate ();
|
|
lowtic = MAXINT;
|
|
|
|
for (i=0 ; i<doomcom->numnodes ; i++)
|
|
if (nodeingame[i] && nettics[i] < lowtic)
|
|
lowtic = nettics[i];
|
|
|
|
if (lowtic < gametic/ticdup)
|
|
I_Error ("TryRunTics: lowtic < gametic");
|
|
|
|
// don't stay in here forever -- give the menu a chance to work
|
|
if (I_GetTime ()/ticdup - entertic >= 20)
|
|
{
|
|
M_Ticker ();
|
|
return;
|
|
}
|
|
}
|
|
|
|
// run the count * ticdup dics
|
|
while (counts--)
|
|
{
|
|
for (i=0 ; i<ticdup ; i++)
|
|
{
|
|
if (gametic/ticdup > lowtic)
|
|
I_Error ("gametic>lowtic");
|
|
if (advancedemo)
|
|
D_DoAdvanceDemo ();
|
|
M_Ticker ();
|
|
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
|
|
}
|
|
}
|