857 lines
23 KiB
C
857 lines
23 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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#include "doom_config.h"
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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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//
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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 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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#define RESENDCOUNT 10
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#define PL_DRONE 0x80 // bit flag in doomdata->player
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doomcom_t* doomcom;
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doomdata_t* netbuffer; // points inside doomcom
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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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doom_boolean nodeingame[MAXNETNODES]; // set false as nodes leave game
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doom_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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doom_boolean reboundpacket;
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doomdata_t reboundstore;
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char exitmsg[80];
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int gametime;
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int frametics[4];
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int frameon;
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int frameskip[4];
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int oldnettics;
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extern int viewangleoffset;
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extern doom_boolean advancedemo;
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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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//
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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)(long long)&(((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)(long long)&(((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("Error: ExpandTics: strange value %i at maketic %i", low, maketic);
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doom_strcpy(error_buf, "Error: ExpandTics: strange value ");
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doom_concat(error_buf, doom_itoa(low, 10));
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doom_concat(error_buf, " at maketic ");
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doom_concat(error_buf, doom_itoa(maketic, 10));
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I_Error(error_buf);
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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 HSendPacket(int node, 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("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 (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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{
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//fprintf(debugfile, "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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doom_fprint(debugfile, "send (");
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doom_fprint(debugfile, doom_itoa(ExpandTics(netbuffer->starttic), 10));
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doom_fprint(debugfile, " + ");
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doom_fprint(debugfile, doom_itoa(netbuffer->numtics, 10));
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doom_fprint(debugfile, ", R ");
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doom_fprint(debugfile, doom_itoa(realretrans, 10));
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doom_fprint(debugfile, ") [");
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doom_fprint(debugfile, doom_itoa(doomcom->datalength, 10));
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doom_fprint(debugfile, "] ");
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}
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for (i = 0; i < doomcom->datalength; i++)
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{
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//fprintf(debugfile, "%i ", ((byte*)netbuffer)[i]);
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doom_fprint(debugfile, doom_itoa(((byte*)netbuffer)[i], 10));
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doom_fprint(debugfile, " ");
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}
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doom_fprint(debugfile, "\n");
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}
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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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doom_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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if (debugfile)
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{
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//fprintf(debugfile, "bad packet length %i\n", doomcom->datalength);
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doom_fprint(debugfile, "bad packet length ");
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doom_fprint(debugfile, doom_itoa(doomcom->datalength, 10));
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doom_fprint(debugfile, "\n");
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}
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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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if (debugfile)
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{
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doom_fprint(debugfile, "bad packet checksum\n");
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}
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return false;
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}
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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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{
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doom_fprint(debugfile, "setup packet\n");
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}
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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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{
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//fprintf(debugfile, "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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doom_fprint(debugfile, "get ");
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doom_fprint(debugfile, doom_itoa(doomcom->remotenode, 10));
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doom_fprint(debugfile, " = (");
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doom_fprint(debugfile, doom_itoa(ExpandTics(netbuffer->starttic), 10));
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doom_fprint(debugfile, " + ");
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doom_fprint(debugfile, doom_itoa(netbuffer->numtics, 10));
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doom_fprint(debugfile, ", R ");
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doom_fprint(debugfile, doom_itoa(realretrans, 10));
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doom_fprint(debugfile, ")[");
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doom_fprint(debugfile, doom_itoa(doomcom->datalength, 10));
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doom_fprint(debugfile, "] ");
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}
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for (i = 0; i < doomcom->datalength; i++)
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{
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//fprintf(debugfile, "%i ", ((byte*)netbuffer)[i]);
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doom_fprint(debugfile, doom_itoa(((byte*)netbuffer)[i], 10));
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doom_fprint(debugfile, " ");
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}
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doom_fprint(debugfile, "\n");
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}
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}
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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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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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doom_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("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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if (debugfile)
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{
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//fprintf(debugfile, "retransmit from %i\n", resendto[netnode]);
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doom_fprint(debugfile, "retransmit from ");
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doom_fprint(debugfile, doom_itoa(resendto[netnode], 10));
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doom_fprint(debugfile, "\n");
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}
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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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if (debugfile)
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{
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//fprintf(debugfile,
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// "out of order packet (%i + %i)\n",
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// realstart, netbuffer->numtics);
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doom_fprint(debugfile, "out of order packet (");
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doom_fprint(debugfile, doom_itoa(realstart, 10));
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doom_fprint(debugfile, " + ");
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doom_fprint(debugfile, doom_itoa(netbuffer->numtics, 10));
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doom_fprint(debugfile, ")\n");
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}
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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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if (debugfile)
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{
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//fprintf(debugfile,
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// "missed tics from %i (%i - %i)\n",
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// netnode, realstart, nettics[netnode]);
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doom_fprint(debugfile, "missed tics from ");
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doom_fprint(debugfile, doom_itoa(netnode, 10));
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doom_fprint(debugfile, " (");
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doom_fprint(debugfile, doom_itoa(realstart, 10));
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doom_fprint(debugfile, " - ");
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doom_fprint(debugfile, doom_itoa(nettics[netnode], 10));
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doom_fprint(debugfile, ")\n");
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}
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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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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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//doom_print ("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("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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; )
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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("Error: Network game synchronization aborted.");
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}
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eventtail++;
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eventtail = (eventtail) & (MAXEVENTS - 1);
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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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doom_boolean gotinfo[MAXNETNODES];
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autostart = true;
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doom_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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doom_print("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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|
{
|
|
if (netbuffer->player != VERSION)
|
|
I_Error("Error: Different DOOM versions cannot play a net game!");
|
|
startskill = netbuffer->retransmitfrom & 15;
|
|
deathmatch = (netbuffer->retransmitfrom & 0xc0) >> 6;
|
|
nomonsters = (netbuffer->retransmitfrom & 0x20) > 0;
|
|
respawnparm = (netbuffer->retransmitfrom & 0x10) > 0;
|
|
startmap = netbuffer->starttic & 0x3f;
|
|
startepisode = netbuffer->starttic >> 6;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// key player, send the setup info
|
|
doom_print("sending network start info...\n");
|
|
do
|
|
{
|
|
CheckAbort();
|
|
for (i = 0; i < doomcom->numnodes; i++)
|
|
{
|
|
netbuffer->retransmitfrom = startskill;
|
|
if (deathmatch)
|
|
netbuffer->retransmitfrom |= (deathmatch << 6);
|
|
if (nomonsters)
|
|
netbuffer->retransmitfrom |= 0x20;
|
|
if (respawnparm)
|
|
netbuffer->retransmitfrom |= 0x10;
|
|
netbuffer->starttic = startepisode * 64 + startmap;
|
|
netbuffer->player = VERSION;
|
|
netbuffer->numtics = 0;
|
|
HSendPacket(i, NCMD_SETUP);
|
|
}
|
|
|
|
#if 1
|
|
for (i = 10; i && HGetPacket(); --i)
|
|
{
|
|
if ((netbuffer->player & 0x7f) < MAXNETNODES)
|
|
gotinfo[netbuffer->player & 0x7f] = true;
|
|
}
|
|
#else
|
|
while (HGetPacket())
|
|
{
|
|
gotinfo[netbuffer->player & 0x7f] = true;
|
|
}
|
|
#endif
|
|
|
|
for (i = 1; i < doomcom->numnodes; i++)
|
|
if (!gotinfo[i])
|
|
break;
|
|
} while (i < doomcom->numnodes);
|
|
}
|
|
}
|
|
|
|
|
|
//
|
|
// D_CheckNetGame
|
|
// Works out player numbers among the net participants
|
|
//
|
|
void D_CheckNetGame(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MAXNETNODES; i++)
|
|
{
|
|
nodeingame[i] = false;
|
|
nettics[i] = 0;
|
|
remoteresend[i] = false; // set when local needs tics
|
|
resendto[i] = 0; // which tic to start sending
|
|
}
|
|
|
|
// I_InitNetwork sets doomcom and netgame
|
|
I_InitNetwork();
|
|
if (doomcom->id != DOOMCOM_ID)
|
|
I_Error("Error: Doomcom buffer invalid!");
|
|
|
|
netbuffer = &doomcom->data;
|
|
consoleplayer = displayplayer = doomcom->consoleplayer;
|
|
if (netgame)
|
|
D_ArbitrateNetStart();
|
|
|
|
//doom_print("startskill %i deathmatch: %i startmap: %i startepisode: %i\n",
|
|
// startskill, deathmatch, startmap, startepisode);
|
|
doom_print("startskill ");
|
|
doom_print(doom_itoa(startskill, 10));
|
|
doom_print(" deathmatch: ");
|
|
doom_print(doom_itoa(deathmatch, 10));
|
|
doom_print(" startmap: ");
|
|
doom_print(doom_itoa(startmap, 10));
|
|
doom_print(" startepisode: ");
|
|
doom_print(doom_itoa(startepisode, 10));
|
|
doom_print("\n");
|
|
|
|
// read values out of doomcom
|
|
ticdup = doomcom->ticdup;
|
|
maxsend = BACKUPTICS / (2 * ticdup) - 1;
|
|
if (maxsend < 1)
|
|
maxsend = 1;
|
|
|
|
for (i = 0; i < doomcom->numplayers; i++)
|
|
playeringame[i] = true;
|
|
for (i = 0; i < doomcom->numnodes; i++)
|
|
nodeingame[i] = true;
|
|
|
|
//doom_print("player %i of %i (%i nodes)\n",
|
|
// consoleplayer + 1, doomcom->numplayers, doomcom->numnodes);
|
|
doom_print("player ");
|
|
doom_print(doom_itoa(consoleplayer + 1, 10));
|
|
doom_print(" of ");
|
|
doom_print(doom_itoa(doomcom->numplayers, 10));
|
|
doom_print(" (");
|
|
doom_print(doom_itoa(doomcom->numnodes, 10));
|
|
doom_print(" nodes)\n");
|
|
}
|
|
|
|
|
|
//
|
|
// D_QuitNetGame
|
|
// Called before quitting to leave a net game
|
|
// without hanging the other players
|
|
//
|
|
void D_QuitNetGame(void)
|
|
{
|
|
int i, j;
|
|
|
|
if (debugfile)
|
|
doom_close(debugfile);
|
|
|
|
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
|
|
//
|
|
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 = DOOM_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++;
|
|
|
|
if (debugfile)
|
|
{
|
|
//fprintf(debugfile,
|
|
// "=======real: %i avail: %i game: %i\n",
|
|
// realtics, availabletics, counts);
|
|
doom_fprint(debugfile, "=======real: ");
|
|
doom_fprint(debugfile, doom_itoa(realtics, 10));
|
|
doom_fprint(debugfile, " avail: ");
|
|
doom_fprint(debugfile, doom_itoa(availabletics, 10));
|
|
doom_fprint(debugfile, " game: ");
|
|
doom_fprint(debugfile, doom_itoa(counts, 10));
|
|
doom_fprint(debugfile, "\n");
|
|
}
|
|
|
|
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--;
|
|
// doom_print ("-");
|
|
}
|
|
frameskip[frameon & 3] = (oldnettics > nettics[nodeforplayer[i]]);
|
|
oldnettics = nettics[0];
|
|
if (frameskip[0] && frameskip[1] && frameskip[2] && frameskip[3])
|
|
{
|
|
skiptics = 1;
|
|
// doom_print ("+");
|
|
}
|
|
}
|
|
}// demoplayback
|
|
|
|
// wait for new tics if needed
|
|
while (lowtic < gametic / ticdup + counts)
|
|
{
|
|
NetUpdate();
|
|
lowtic = DOOM_MAXINT;
|
|
|
|
for (i = 0; i < doomcom->numnodes; i++)
|
|
if (nodeingame[i] && nettics[i] < lowtic)
|
|
lowtic = nettics[i];
|
|
|
|
if (lowtic < gametic / ticdup)
|
|
I_Error("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("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
|
|
}
|
|
}
|