mirror of
https://github.com/OpenSourcedGames/Hexen.git
synced 2026-09-22 12:30:58 +02:00
initial import
This commit is contained in:
Alex Bevilacqua
@@ -0,0 +1,790 @@
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// I_pcnet.m
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#include "DoomDef.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_CHECKSUM 0x0fffffff
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/*
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if more space needs to be crunched out of the protocol...
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1 drone
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2 player
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8 tic
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5 numtics
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#define NCMD_EXIT 0x80000000
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#define NCMD_RETRANSMIT 0x40000000 // a retransmit will have 0 tics
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#define NCMD_DRONE 0x20000000
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#define NCMD_PLAYER 0x18000000
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#define NCMD_PLAYERSHIFT 27
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#define NCMD_TIC 0x00ff0000
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#define NCMD_TICSHIFT 16
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#define NCMD_NUMTICS 0x0000ff00
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#define NCMD_NUMTICSSHIFT 8
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#define NCMD_CHECKSUM 0x000000ff
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*/
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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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==============================================================================
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NETWORKING
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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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a gametic cannot be run until nettics[] > gametic for all players
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==============================================================================
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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 gametime;
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int maketic;
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int lastnettic, skiptics;
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int ticdup;
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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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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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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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#ifdef NeXT
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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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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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/*
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==============
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=
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= HSendPacket
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=
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==============
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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 (!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 (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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fprintf (debugfile,"send (%i + %i, R %i) [%i] "
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,ExpandTics(netbuffer->starttic),netbuffer->numtics, realretrans, doomcom->datalength);
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for (i=0 ; i<doomcom->datalength ; i++)
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fprintf (debugfile,"%i ",((byte *)netbuffer)[i]);
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fprintf (debugfile,"\n");
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}
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I_NetCmd ();
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}
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/*
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==============
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=
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= HGetPacket
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=
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= Returns false if no packet is waiting
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=
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==============
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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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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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fprintf (debugfile,"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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if (debugfile)
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fprintf (debugfile,"bad packet checksum\n");
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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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fprintf (debugfile,"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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fprintf (debugfile,"get %i = (%i + %i, R %i)[%i] ",doomcom->remotenode,
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ExpandTics(netbuffer->starttic),netbuffer->numtics, realretrans, doomcom->datalength);
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for (i=0 ; i<doomcom->datalength ; i++)
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fprintf (debugfile,"%i ",((byte *)netbuffer)[i]);
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fprintf (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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===================
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=
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= GetPackets
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=
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===================
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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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int netdrone;
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int j;
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ticcmd_t *src, *dest;
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int dupedstart, dupedend;
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int skiptics;
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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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netdrone = netbuffer->player & PL_DRONE;
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netconsole = netbuffer->player & ~PL_DRONE;
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netnode = doomcom->remotenode;
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//
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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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//
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realstart = ExpandTics (netbuffer->starttic);
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dupedstart = realstart*doomcom->ticdup;
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dupedend = (realstart+netbuffer->numtics)*doomcom->ticdup;
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//
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// check for exiting the game
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//
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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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if (!netdrone)
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{
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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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}
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continue;
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}
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//
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// drone packets are just notifications
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//
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if (netdrone)
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{
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nettics[netnode] = dupedend;
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continue;
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}
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nodeforplayer[netconsole] = netnode;
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//
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// check for retransmit request
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//
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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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fprintf (debugfile,"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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//
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// check for out of order / duplicated packet
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//
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if (dupedend == nettics[netnode])
|
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continue;
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if (dupedend < nettics[netnode])
|
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{
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if (debugfile)
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fprintf (debugfile,"out of order packet (%i + %i)\n" ,realstart,netbuffer->numtics);
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continue;
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}
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//
|
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// check for a missed packet
|
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//
|
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if (dupedstart > 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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fprintf (debugfile,"missed tics from %i (%i - %i)\n", netnode, dupedstart, nettics[netnode]);
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remoteresend[netnode] = true;
|
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continue;
|
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}
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|
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//
|
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// update command store from the packet
|
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//
|
||||
remoteresend[netnode] = false;
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skiptics = nettics[netnode]/doomcom->ticdup - realstart;
|
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src = &netbuffer->cmds[skiptics];
|
||||
|
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while (nettics[netnode] < dupedend)
|
||||
{
|
||||
for (j=0 ; j<doomcom->ticdup ; j++)
|
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{
|
||||
dest = &netcmds[netconsole][nettics[netnode]%BACKUPTICS];
|
||||
nettics[netnode]++;
|
||||
*dest = *src;
|
||||
src->chatchar = 0;
|
||||
if (src->buttons & BT_SPECIAL)
|
||||
src->buttons = 0;
|
||||
}
|
||||
src++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
=============
|
||||
=
|
||||
= NetUpdate
|
||||
=
|
||||
= Builds ticcmds for console player
|
||||
= sends out a packet
|
||||
=============
|
||||
*/
|
||||
|
||||
void NetUpdate (void)
|
||||
{
|
||||
int nowtime;
|
||||
int newtics;
|
||||
int i,j;
|
||||
int gameticdiv;
|
||||
int realstart;
|
||||
|
||||
if (singletics)
|
||||
return; // singletic update is syncronous
|
||||
|
||||
//
|
||||
// check time
|
||||
//
|
||||
nowtime = I_GetTime ()/doomcom->ticdup;
|
||||
newtics = nowtime - gametime;
|
||||
gametime = nowtime;
|
||||
if (newtics <= 0) // nothing new to update
|
||||
goto listen;
|
||||
|
||||
if (skiptics <= newtics)
|
||||
{
|
||||
newtics -= skiptics;
|
||||
skiptics = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
skiptics -= newtics;
|
||||
newtics = 0;
|
||||
}
|
||||
|
||||
|
||||
netbuffer->player = consoleplayer;
|
||||
if (doomcom->drone)
|
||||
netbuffer->player |= PL_DRONE;
|
||||
|
||||
//
|
||||
// drone packets
|
||||
//
|
||||
if (doomcom->drone)
|
||||
{
|
||||
I_StartTic ();
|
||||
D_ProcessEvents ();
|
||||
goto sendit;
|
||||
}
|
||||
|
||||
//
|
||||
// build new ticcmds for console player
|
||||
//
|
||||
gameticdiv = (gametic+doomcom->ticdup-1)/doomcom->ticdup;
|
||||
for (i=0 ; i<newtics ; i++)
|
||||
{
|
||||
I_StartTic ();
|
||||
D_ProcessEvents ();
|
||||
if (maketic - gameticdiv >= BACKUPTICS/2 /* /doomcom->ticdup */- 1)
|
||||
{
|
||||
newtics = i;
|
||||
break; // can't hold any more
|
||||
}
|
||||
//printf ("mk:%i ",maketic);
|
||||
G_BuildTiccmd (&localcmds[maketic%BACKUPTICS]);
|
||||
maketic++;
|
||||
}
|
||||
|
||||
//
|
||||
// send the packet to the other nodes
|
||||
//
|
||||
sendit:
|
||||
for (i=0 ; i<doomcom->numnodes ; i++)
|
||||
if (nodeingame[i])
|
||||
{
|
||||
if (doomcom->drone)
|
||||
{
|
||||
netbuffer->starttic = realstart = maketic + BACKUPTICS/2;
|
||||
netbuffer->numtics = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
netbuffer->starttic = realstart = resendto[i];
|
||||
netbuffer->numtics = maketic - realstart;
|
||||
resendto[i] = maketic - doomcom->extratics;
|
||||
}
|
||||
|
||||
if (netbuffer->numtics > BACKUPTICS)
|
||||
I_Error ("NetUpdate: netbuffer->numtics > BACKUPTICS");
|
||||
|
||||
for (j=0 ; j< netbuffer->numtics ; j++)
|
||||
netbuffer->cmds[j] =
|
||||
localcmds[(realstart+j)%BACKUPTICS];
|
||||
|
||||
if (remoteresend[i])
|
||||
{
|
||||
netbuffer->retransmitfrom = nettics[i]/doomcom->ticdup;
|
||||
HSendPacket (i, NCMD_RETRANSMIT);
|
||||
}
|
||||
else
|
||||
{
|
||||
netbuffer->retransmitfrom = 0;
|
||||
HSendPacket (i, 0);
|
||||
}
|
||||
}
|
||||
|
||||
//
|
||||
// listen for other packets
|
||||
//
|
||||
listen:
|
||||
|
||||
GetPackets ();
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
=====================
|
||||
=
|
||||
= CheckAbort
|
||||
=
|
||||
=====================
|
||||
*/
|
||||
|
||||
void CheckAbort (void)
|
||||
{
|
||||
event_t *ev;
|
||||
|
||||
I_WaitVBL(2);
|
||||
|
||||
I_StartTic ();
|
||||
for ( ; eventtail != eventhead
|
||||
; eventtail = (++eventtail)&(MAXEVENTS-1) )
|
||||
{
|
||||
ev = &events[eventtail];
|
||||
if (ev->type == ev_keydown && ev->data1 == KEY_ESCAPE)
|
||||
I_Error ("Network game synchronization aborted.");
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
=====================
|
||||
=
|
||||
= D_ArbitrateNetStart
|
||||
=
|
||||
=====================
|
||||
*/
|
||||
|
||||
void D_ArbitrateNetStart (void)
|
||||
{
|
||||
int i;
|
||||
boolean gotinfo[MAXNETNODES];
|
||||
|
||||
autostart = true;
|
||||
memset (gotinfo,0,sizeof(gotinfo));
|
||||
|
||||
if (doomcom->consoleplayer)
|
||||
{ // listen for setup info from key player
|
||||
printf ("listening for network start info...\n");
|
||||
while (1)
|
||||
{
|
||||
CheckAbort ();
|
||||
if (!HGetPacket ())
|
||||
continue;
|
||||
if (netbuffer->checksum & NCMD_SETUP)
|
||||
{
|
||||
if (netbuffer->player != VERSION)
|
||||
I_Error ("Different DOOM versions cannot play a net game!");
|
||||
startskill = netbuffer->retransmitfrom & 15;
|
||||
deathmatch = (netbuffer->retransmitfrom & 0x80) > 0;
|
||||
nomonsters = (netbuffer->retransmitfrom & 0x40) > 0;
|
||||
respawnparm = (netbuffer->retransmitfrom & 0x20) > 0;
|
||||
startmap = netbuffer->starttic & 15;
|
||||
startepisode = netbuffer->starttic >> 4;
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{ // key player, send the setup info
|
||||
printf ("sending network start info...\n");
|
||||
do
|
||||
{
|
||||
CheckAbort ();
|
||||
for (i=0 ; i<doomcom->numnodes ; i++)
|
||||
{
|
||||
netbuffer->retransmitfrom = startskill;
|
||||
if (deathmatch)
|
||||
netbuffer->retransmitfrom |= 0x80;
|
||||
if (nomonsters)
|
||||
netbuffer->retransmitfrom |= 0x40;
|
||||
if (respawnparm)
|
||||
netbuffer->retransmitfrom |= 0x20;
|
||||
netbuffer->starttic = startepisode * 16 + startmap;
|
||||
netbuffer->player = VERSION;
|
||||
netbuffer->numtics = 0;
|
||||
HSendPacket (i, NCMD_SETUP);
|
||||
}
|
||||
|
||||
while (HGetPacket ())
|
||||
{
|
||||
gotinfo[netbuffer->player&0x7f] = true;
|
||||
}
|
||||
|
||||
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
|
||||
===================
|
||||
*/
|
||||
|
||||
extern int viewangleoffset;
|
||||
|
||||
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 ("Doomcom buffer invalid!");
|
||||
netbuffer = &doomcom->data;
|
||||
consoleplayer = displayplayer = doomcom->consoleplayer;
|
||||
if (netgame)
|
||||
D_ArbitrateNetStart ();
|
||||
printf ("startskill %i deathmatch: %i startmap: %i startepisode: %i\n", startskill, deathmatch, startmap, startepisode);
|
||||
|
||||
// read values out of doomcom
|
||||
ticdup = doomcom->ticdup;
|
||||
|
||||
for (i=0 ; i<doomcom->numplayers ; i++)
|
||||
playeringame[i] = true;
|
||||
for (i=0 ; i<doomcom->numnodes ; i++)
|
||||
nodeingame[i] = true;
|
||||
|
||||
printf ("player %i of %i (%i nodes)\n", 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 (debugfile)
|
||||
fclose (debugfile);
|
||||
|
||||
if (!netgame || !usergame || consoleplayer == -1)
|
||||
return;
|
||||
|
||||
// send a bunch of packets for security
|
||||
netbuffer->player = consoleplayer;
|
||||
if (doomcom->drone)
|
||||
netbuffer->player |= PL_DRONE;
|
||||
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], frameon;
|
||||
int frameskip[4];
|
||||
int oldnettics;
|
||||
extern boolean advancedemo;
|
||||
|
||||
void TryRunTics (void)
|
||||
{
|
||||
int i;
|
||||
int lowtic, nextlowest;
|
||||
int entertic;
|
||||
int static oldentertics;
|
||||
int realtics, availabletics;
|
||||
int counts;
|
||||
int numplaying;
|
||||
|
||||
//
|
||||
// get real tics
|
||||
//
|
||||
entertic = I_GetTime ();
|
||||
realtics = entertic - oldentertics;
|
||||
oldentertics = entertic;
|
||||
|
||||
//
|
||||
// get available tics
|
||||
//
|
||||
NetUpdate ();
|
||||
|
||||
lowtic = nextlowest = MAXINT;
|
||||
numplaying = 0;
|
||||
for (i=0 ; i<doomcom->numnodes ; i++)
|
||||
if (nodeingame[i])
|
||||
{
|
||||
numplaying++;
|
||||
if (nettics[i] < lowtic)
|
||||
{
|
||||
nextlowest = lowtic;
|
||||
lowtic = nettics[i];
|
||||
}
|
||||
else if (nettics[i] < nextlowest)
|
||||
nextlowest = nettics[i];
|
||||
}
|
||||
availabletics = lowtic - gametic;
|
||||
|
||||
|
||||
//
|
||||
// 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);
|
||||
|
||||
//=============================================================================
|
||||
//
|
||||
// ideally nettics[0] should be 1 - 3 tics above lowtic
|
||||
// if we are consistantly slower, speed up time
|
||||
// drones should never hold up the other players
|
||||
//
|
||||
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--;
|
||||
// printf ("-");
|
||||
}
|
||||
frameskip[frameon&3] = (oldnettics > nettics[nodeforplayer[i]]);
|
||||
oldnettics = nettics[0];
|
||||
if (frameskip[0] && frameskip[1] && frameskip[2] && frameskip[3])
|
||||
{
|
||||
skiptics = 1;
|
||||
// printf ("+");
|
||||
}
|
||||
}
|
||||
//=============================================================================
|
||||
|
||||
//
|
||||
// wait for new tics if needed
|
||||
//
|
||||
while (lowtic < gametic + counts)
|
||||
{
|
||||
|
||||
NetUpdate ();
|
||||
lowtic = MAXINT;
|
||||
|
||||
for (i=0 ; i<doomcom->numnodes ; i++)
|
||||
if (nodeingame[i] && nettics[i] < lowtic)
|
||||
lowtic = nettics[i];
|
||||
|
||||
if (lowtic < gametic)
|
||||
I_Error ("TryRunTics: lowtic < gametic");
|
||||
|
||||
// don't stay in here forever -- give the menu a chance to work
|
||||
if (I_GetTime () - entertic >= 20)
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// run the tics
|
||||
//
|
||||
while (counts--)
|
||||
{
|
||||
G_Ticker ();
|
||||
NetUpdate (); // check for new console commands
|
||||
gametic++;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user