raze/source/sw/src/network.cpp

//-------------------------------------------------------------------------
/*
Copyright (C) 1997, 2005 - 3D Realms Entertainment

This file is part of Shadow Warrior version 1.2

Shadow Warrior is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

Original Source: 1997 - Frank Maddin and Jim Norwood
Prepared for public release: 03/28/2005 - Charlie Wiederhold, 3D Realms
*/
//-------------------------------------------------------------------------
#include "ns.h"

#include "build.h"
#include "baselayer.h"
#include "mmulti.h"

#include "keys.h"
#include "game.h"
#include "tags.h"
#include "names2.h"
#include "network.h"
#include "pal.h"
#include "demo.h"

#include "weapon.h"
#include "text.h"
#include "menus.h"

BEGIN_SW_NS

void getinput(SW_PACKET*);

/*
SYNC BUG NOTES:

    1.  Look at Prediction code first when player movement is involved.  If the
    prediction code changes any variable not in the Player or Players
    Sprite/User structure that effects movement then there will be a Out Of Sync
    problem.

    EXAMPLE:  Prediction player was updating a sop->drive_oangvel making it
    invalid for movement.  Look at DoPlayerBoatTurn for comment.

    2.  Changing movement variables in the draw code.  Because the draw code is
    called at a variable rate this don't work.  This includes using RANDOM_RANGE
    or RANDOM_P2 in the draw code.  This updates the random seed variable and is
    only for movement code.  Use STD_RANDOM_RANGE for draw code.

    3.  Plain old bugs such as using uninitialized local variables.

*/

//#undef MAXSYNCBYTES
//#define MAXSYNCBYTES 16
static uint8_t tempbuf[576], packbuf[576];
int PlayClock;
extern SWBOOL PauseKeySet;

gNET gNet;
extern short PlayerQuitMenuLevel;

#define TIMERUPDATESIZ 32

//SW_PACKET fsync;

//Local multiplayer variables
// should move this to a local scope of faketimerhandler - do it when able to test
SW_PACKET loc;

//SW_PACKET oloc;

SWBOOL ready2send = 0;

SWBOOL CommEnabled = FALSE;
uint8_t CommPlayers = 0;
int movefifoplc, movefifosendplc; //, movefifoend[MAX_SW_PLAYERS];
unsigned int MoveThingsCount;

//int myminlag[MAX_SW_PLAYERS];
int mymaxlag, otherminlag, bufferjitter = 1;
extern char sync_first[MAXSYNCBYTES][60];
extern int sync_found;

//
// Tic Duplication - so you can move multiple times per packet
//
typedef struct
{
    int32_t vel;
    int32_t svel;
    int32_t angvel;
    int32_t aimvel;
    int32_t bits;
} SW_AVERAGE_PACKET;

int MovesPerPacket = 1;
SW_AVERAGE_PACKET AveragePacket;

// GAME.C sync state variables
uint8_t syncstat[MAXSYNCBYTES];
//int syncvalhead[MAX_SW_PLAYERS];
int syncvaltail, syncvaltottail;
void GetSyncInfoFromPacket(uint8_t *packbuf, int packbufleng, int *j, int otherconnectindex);

// when you set totalclock to 0 also set this one
int ototalclock;
int smoothratio;
int save_totalclock;

// must start out as 0

SWBOOL GamePaused = FALSE;
SWBOOL NetBroadcastMode = TRUE;
SWBOOL NetModeOverride = FALSE;


void netsendpacket(int ind, uint8_t* buf, int len)
{
    uint8_t bbuf[sizeof(packbuf) + sizeof(PACKET_PROXY)];
    PACKET_PROXYp prx = (PACKET_PROXYp)bbuf;
    int i;

    // send via master if in M/S mode and we are not the master, and the recipient is not the master and not ourselves
    if (!NetBroadcastMode && myconnectindex != connecthead && ind != myconnectindex && ind != connecthead)
    {
        if ((unsigned)len > sizeof(packbuf))
        {
            len = sizeof(packbuf);
        }

        prx->PacketType = PACKET_TYPE_PROXY;
        prx->PlayerIndex = (uint8_t)ind;
        memcpy(&prx[1], buf, len);  // &prx[1] == (char*)prx + sizeof(PACKET_PROXY)
        len += sizeof(PACKET_PROXY);

        //sendpacket(connecthead, bbuf, len);
        return;
    }

    //sendpacket(ind, buf, len);

}

void netbroadcastpacket(uint8_t* buf, int len)
{
    int i;
    uint8_t bbuf[sizeof(packbuf) + sizeof(PACKET_PROXY)];
    PACKET_PROXYp prx = (PACKET_PROXYp)bbuf;

    // broadcast via master if in M/S mode and we are not the master
    if (!NetBroadcastMode && myconnectindex != connecthead)
    {
        if ((unsigned)len > sizeof(packbuf))
        {
            len = sizeof(packbuf);
        }


        prx->PacketType = PACKET_TYPE_PROXY;
        prx->PlayerIndex = (uint8_t)(-1);
        memcpy(&prx[1], buf, len);
        len += sizeof(PACKET_PROXY);

        //sendpacket(connecthead, bbuf, len);
        return;
    }

    for (i = connecthead; i >= 0; i = connectpoint2[i])
    {
        if (i == myconnectindex) continue;
        //sendpacket(i, buf, len);
        buildprintf("netsendpacket() sends normal to %d\n",i);
    }
    buildputs("Contents:");
    for (i=0; i<len; i++)
        buildprintf(" %02x", buf[i]);
    buildputs("\n");
}

int netgetpacket(int *ind, uint8_t* buf)
{
    int i;
    int len;
    PACKET_PROXYp prx;

	len = 0;// getpacket(ind, buf);
    if ((unsigned)len < sizeof(PACKET_PROXY) || buf[0] != PACKET_TYPE_PROXY)
    {
        if (len > 0)
        {
        }
        return len;
    }

    prx = (PACKET_PROXYp)buf;


    if (myconnectindex == connecthead)
    {
        // I am the master

        if (prx->PlayerIndex == (uint8_t)(-1))
        {
            // broadcast

            // Rewrite the player index to be the sender's connection number
            prx->PlayerIndex = (uint8_t)*ind;

            // Transmit to all the other players except ourselves and the sender
            for (i = connecthead; i >= 0; i = connectpoint2[i])
            {
                if (i == myconnectindex || i == *ind) continue;
                buildprintf("netgetpacket(): distributing to %d\n", i);
                //sendpacket(i, buf, len);
            }

            // Return the packet payload to the caller
            len -= sizeof(PACKET_PROXY);
            memmove(buf, &prx[1], len);
            return len;
        }
        else
        {
            // proxy send to a specific player

            i = prx->PlayerIndex;

            // Rewrite the player index to be the sender's connection number
            prx->PlayerIndex = (uint8_t)*ind;

            // Transmit to the intended recipient
            if (i == myconnectindex)
            {
                len -= sizeof(PACKET_PROXY);
                memmove(buf, &prx[1], len);
                return len;
            }

            buildprintf("netgetpacket(): forwarding to %d\n", i);
            //sendpacket(i, buf, len);
            return 0;   // nothing for us to do
        }
    }
    else if (*ind == connecthead)
    {
        // I am a slave, and the proxy message came from the master
        *ind = prx->PlayerIndex;
        len -= sizeof(PACKET_PROXY);
        memmove(buf, &prx[1], len);
        return len;
    }
    else
    {
        buildprintf("netgetpacket(): Got a proxy message from %d instead of %d\n",*ind,connecthead);
    }
    return 0;
}


int EncodeBits(SW_PACKET *pak, SW_PACKET *old_pak, uint8_t* buf)
{
    uint8_t* base_ptr = buf;
    unsigned i;

    // skipping the bits field sync test fake byte (Ed. Ken)
    *buf = 0;
    buf++;

    if (pak->vel != old_pak->vel)
    {
        *((short *)buf) = pak->vel;
        buf += sizeof(pak->vel);
        SET(*base_ptr, BIT(0));
    }

    if (pak->svel != old_pak->svel)
    {
        *((short *)buf) = pak->svel;
        buf += sizeof(pak->svel);
        SET(*base_ptr, BIT(1));
    }

    if (pak->angvel != old_pak->angvel)
    {
        *((char *)buf) = pak->angvel;
        buf += sizeof(pak->angvel);
        SET(*base_ptr, BIT(2));
    }

    if (pak->aimvel != old_pak->aimvel)
    {
        *((char *)buf) = pak->aimvel;
        buf += sizeof(pak->aimvel);
        SET(*base_ptr, BIT(3));
    }

    //won't work if > 4 bytes
    for (i = 0; i < sizeof(pak->bits); i++)
    {
        if (TEST(pak->bits ^ old_pak->bits, 0xff<<(i<<3)))
        {
            *buf = (pak->bits>>(i<<3));
            buf++;
            SET(*base_ptr, BIT(i+4));
        }
    }

    return buf - base_ptr;
}

int DecodeBits(SW_PACKET *pak, SW_PACKET *old_pak, uint8_t* buf)
{
    uint8_t* base_ptr = buf;
    unsigned i;

    // skipping the bits field sync test fake byte (Ed. Ken)
    buf++;

    *pak = *old_pak;

    if (TEST(*base_ptr, BIT(0)))
    {
        pak->vel = *(short *)buf;
        buf += sizeof(pak->vel);
    }

    if (TEST(*base_ptr, BIT(1)))
    {
        pak->svel = *(short *)buf;
        buf += sizeof(pak->svel);
    }

    if (TEST(*base_ptr, BIT(2)))
    {
        pak->angvel = *(char *)buf;
        buf += sizeof(pak->angvel);
    }

    if (TEST(*base_ptr, BIT(3)))
    {
        pak->aimvel = *(char *)buf;
        buf += sizeof(pak->aimvel);
    }

    //won't work if > 4 bytes
    for (i = 0; i < sizeof(pak->bits); i++)
    {
        if (TEST(*base_ptr, BIT(i+4)))
        {
            RESET(pak->bits, 0xff<<(i<<3));
            SET(pak->bits, ((int)(*buf))<<(i<<3));
            buf++;
        }
    }

    return buf - base_ptr;
}

void
PauseGame(void)
{
    if (PauseKeySet)
        return;

    if (DemoPlaying || DemoRecording)
        return;

    if (GamePaused)
        return;

    if (numplayers < 2)
        GamePaused = TRUE;
}

void
ResumeGame(void)
{
    if (PauseKeySet)
        return;

    if (DemoPlaying || DemoRecording)
        return;

    if (numplayers < 2)
        GamePaused = FALSE;
}

void
PauseAction(void)
{
    ready2send = 0;
    save_totalclock = (int32_t) totalclock;
}

void
ResumeAction(void)
{
    ready2send = 1;
    totalclock = save_totalclock;
}

void
SW_SendMessage(short pnum, const char *text)
{
    if (!CommEnabled)
        return;

    tempbuf[0] = PACKET_TYPE_MESSAGE;
    strcpy((char *)&tempbuf[1], text);
    netsendpacket(pnum, tempbuf, strlen(text) + 2);
}


void
InitNetPlayerOptions(void)
{
    short pnum;
    PLAYERp pp = Player + myconnectindex;
    PACKET_OPTIONS p;

    strncpy(pp->PlayerName, playername, 32);

    // myconnectindex palette
    pp->TeamColor = gs.NetColor;
    pp->SpriteP->pal = PALETTE_PLAYER0 + pp->TeamColor;
    User[pp->SpriteP - sprite]->spal = pp->SpriteP->pal;

    if (CommEnabled)
    {
        p.PacketType = PACKET_TYPE_PLAYER_OPTIONS;
        p.AutoRun = cl_autorun;
        p.Color = gs.NetColor;
        strncpy(p.PlayerName, playername, 32);

        //TRAVERSE_CONNECT(pnum)
        {
            //if (pnum != myconnectindex)
            {
                //netsendpacket(pnum, (char *)(&p), sizeof(p));
                netbroadcastpacket((uint8_t*)(&p), sizeof(p));
            }
        }
    }
}

#if 0
void
SendMulitNameChange(char *new_name)
{
    short pnum;
    PLAYERp pp = Player + myconnectindex;
    PACKET_NAME_CHANGE p;

    if (!CommEnabled)
        return;

    strcpy(pp->PlayerName, new_name);
    playername = new_name;
    SetRedrawScreen(pp);

    //TRAVERSE_CONNECT(pnum)
    {
        //if (pnum != myconnectindex)
        {
            p.PacketType = PACKET_TYPE_NAME_CHANGE;
            strcpy(p.PlayerName, pp->PlayerName);
            //netsendpacket(pnum, (char *)(&p), sizeof(p));
            netbroadcastpacket((uint8_t*)(&p), sizeof(p));
        }
    }
}
#endif

void
SendVersion(int version)
{
    short pnum;
    PLAYERp pp = Player + myconnectindex;
    PACKET_VERSION p;

    if (!CommEnabled)
        return;

    pp->PlayerVersion = version;

    //TRAVERSE_CONNECT(pnum)
    {
        //if (pnum != myconnectindex)
        {
            p.PacketType = PACKET_TYPE_VERSION;
            p.Version = version;
            //netsendpacket(pnum, (char *)(&p), sizeof(p));
            netbroadcastpacket((uint8_t*)(&p), sizeof(p));
        }
    }
}

void
CheckVersion(int GameVersion)
{
    short pnum;
    PACKET_VERSION p;
#define VERSION_MSG "You cannot play with different versions!"

    if (!CommEnabled)
        return;

    TRAVERSE_CONNECT(pnum)
    {
        if (pnum != myconnectindex)
        {
            if (GameVersion != Player[pnum].PlayerVersion)
            {
                buildprintf("CheckVersion(): player %d has version %d, expecting %d\n",
                            pnum, Player[pnum].PlayerVersion, GameVersion);

                adduserquote(VERSION_MSG);
                adduserquote(VERSION_MSG);
                adduserquote(VERSION_MSG);
                adduserquote(VERSION_MSG);
                adduserquote(VERSION_MSG);
                adduserquote(VERSION_MSG);

                if (!Player[pnum].PlayerVersion)
                {
                    SW_SendMessage(pnum, VERSION_MSG);
                    SW_SendMessage(pnum, VERSION_MSG);
                    SW_SendMessage(pnum, VERSION_MSG);
                    SW_SendMessage(pnum, VERSION_MSG);
                    SW_SendMessage(pnum, VERSION_MSG);
                    SW_SendMessage(pnum, VERSION_MSG);
                }
            }
        }
    }
}

void
Connect(void)
{
    int players_found, i, yline;
    short other;

    if (CommEnabled)
    {
#if 0
        int x1, x2, y1, y2;
        int screensize = xdim;
        extern short BorderTest[];

        // put up a tile
        x1 = (xdim >> 1) - (screensize >> 1);
        x2 = x1 + screensize - 1;
        y1 = ((ydim) >> 1) - (((screensize * (ydim)) / xdim) >> 1);
        y2 = y1 + ((screensize * (ydim)) / xdim) - 1;
        rotatespritetile(0L, 0L, BorderTest[gs.BorderTile], 0, x1, y1, x2, y2, 0);
        nextpage();
#endif

        screenpeek = myconnectindex;
    }

    //InitTimingVars();                   // resettiming();
}

int wfe_Clock;
SWBOOL (*wfe_ExitCallback)(void);

void
waitforeverybody(void)
{
    int i, size = 1;
    short other;

    if (!CommEnabled)
        return;

    buildprintf("waitforeverybody() #%d\n", Player[myconnectindex].playerreadyflag + 1);

    //tenDbLprintf(gTenLog, 3, "in w4e");
    //tenDbFlushLog(gTenLog);
    tempbuf[0] = PACKET_TYPE_PLAYER_READY;
#ifdef DEBUG
    tempbuf[1] = Player[myconnectindex].playerreadyflag + 1;
    size++;
#endif
    if (!NetBroadcastMode && myconnectindex != connecthead)
        netsendpacket(connecthead, tempbuf, size);
    else
        netbroadcastpacket(tempbuf, size);

#if 0
    for (i = connecthead; i >= 0; i = connectpoint2[i])
    {
        if (i != myconnectindex)
        {
            DSPRINTF(ds,"Ready packet sent to %d", i);
            DebugWriteString(ds);
        }
    }
#endif

    //inputState.GetKeyStatus(KEYSC_ESC) = FALSE;
    Player[myconnectindex].playerreadyflag++;

    while (TRUE)
    {
        if (PlayerQuitMenuLevel >= 0)
        {
            //DSPRINTF(ds,"%d, Player Quit Menu Level %d", myconnectindex, PlayerQuitMenuLevel);
            //DebugWriteString(ds);

            MenuCommPlayerQuit(PlayerQuitMenuLevel);
            PlayerQuitMenuLevel = -1;
        }

        handleevents();
        getpackets();

        if (wfe_ExitCallback && wfe_ExitCallback())
        {
            // allow exit
            //if (inputState.GetKeyStatus(KEYSC_ESC))
            {
                short pnum;
                //TRAVERSE_CONNECT(pnum)
                {
                    //if (pnum != myconnectindex)
                    {
                        tempbuf[0] = PACKET_TYPE_MENU_LEVEL_QUIT;
                        //netsendpacket(pnum, tempbuf, 1);
                        netbroadcastpacket(tempbuf, 1);
                    }
                }

                TerminateGame();
            }
        }

#if 0
        for (i = connecthead; i >= 0; i = connectpoint2[i])
        {
            DSPRINTF(ds,"myindex %d, myready %d, Player %d, Ready %d", myconnectindex, Player[myconnectindex].playerreadyflag, i, Player[i].playerreadyflag);
            DebugWriteString(ds);
        }
#endif

        for (i = connecthead; i >= 0; i = connectpoint2[i])
        {
            if (Player[i].playerreadyflag < Player[myconnectindex].playerreadyflag)
                break;
            if ((!NetBroadcastMode) && (myconnectindex != connecthead)) { i = -1; break; } //slaves in M/S mode only wait for master
        }

        if (i < 0)
        {
            return;
        }
    }
}


SWBOOL MyCommPlayerQuit(void)
{
    PLAYERp pp;
    short i;
    short prev_player = 0;
    extern SWBOOL QuitFlag;
    short found = FALSE;
    short quit_player_index = 0;

    TRAVERSE_CONNECT(i)
    {
        if (TEST_SYNC_KEY(Player + i, SK_QUIT_GAME))
        {
            short pnum;
            found = TRUE;

            quit_player_index = i;

            if (i != myconnectindex)
            {
                sprintf(ds,"%s has quit the game.",Player[i].PlayerName);
                adduserquote(ds);
            }
        }
    }

    if (found)
    {
        TRAVERSE_CONNECT(i)
        {
            pp = Player + i;

            if (i == quit_player_index)
            {
                PLAYERp qpp = Player + quit_player_index;
                SET(qpp->SpriteP->cstat, CSTAT_SPRITE_INVISIBLE);
                RESET(qpp->SpriteP->cstat, CSTAT_SPRITE_BLOCK|CSTAT_SPRITE_BLOCK_HITSCAN|CSTAT_SPRITE_BLOCK_MISSILE);
                InitBloodSpray(qpp->PlayerSprite,TRUE,-2);
                InitBloodSpray(qpp->PlayerSprite,FALSE,-2);
                qpp->SpriteP->ang = NORM_ANGLE(qpp->SpriteP->ang + 1024);
                InitBloodSpray(qpp->PlayerSprite,FALSE,-1);
                InitBloodSpray(qpp->PlayerSprite,TRUE,-1);
            }

            // have to reorder the connect list
            if (!TEST_SYNC_KEY(pp, SK_QUIT_GAME))
            {
                prev_player = i;
                continue;
            }

            // if I get my own messages get out to DOS QUICKLY!!!
            if (i == myconnectindex)
            {
                QuitFlag = TRUE;
                ready2send = 0;
                return TRUE;
            }

            // for COOP mode
            if (screenpeek == i)
            {
                screenpeek = connectpoint2[i];
                if (screenpeek < 0)
                    screenpeek = connecthead;
            }

            DSPRINTF(ds,"MyCommPlayerQuit %d", quit_player_index);
            DebugWriteString(ds);

            if (i == connecthead)
                connecthead = connectpoint2[connecthead];
            else
                connectpoint2[prev_player] = connectpoint2[i];

            numplayers--;
            CommPlayers--;
        }
    }

    return FALSE;
}

SWBOOL MenuCommPlayerQuit(short quit_player)
{
    PLAYERp pp;
    short i;
    short prev_player = 0;
    short pnum;

    // tell everyone else you left the game
    TRAVERSE_CONNECT(pnum)
    {
        if (pnum != quit_player)
        {
            sprintf(ds,"%s has quit the game.",Player[myconnectindex].PlayerName);
            SW_SendMessage(pnum, ds);
        }
    }

    TRAVERSE_CONNECT(i)
    {
        pp = Player + i;

        // have to reorder the connect list
        if (i != quit_player)
        {
            prev_player = i;
            continue;
        }

        // for COOP mode
        if (screenpeek == i)
        {
            screenpeek = connectpoint2[i];
            if (screenpeek < 0)
                screenpeek = connecthead;
        }

        DSPRINTF(ds,"MenuPlayerQuit %d", quit_player);
        DebugWriteString(ds);

        if (i == connecthead)
            connecthead = connectpoint2[connecthead];
        else
            connectpoint2[prev_player] = connectpoint2[i];

        numplayers--;
        CommPlayers--;
    }

    return FALSE;
}

void ErrorCorrectionQuit(void)
{
    int oldtotalclock;
    short i,j;

    if (CommPlayers > 1)
    {
        for (j = 0; j < MAX_SW_PLAYERS; j++)
        {
            oldtotalclock = (int32_t) totalclock;
            while (totalclock < oldtotalclock + synctics)
            {
                handleevents();
                getpackets();
            }

            tempbuf[0] = PACKET_TYPE_NULL_PACKET;
            netbroadcastpacket(tempbuf, 1);
        }
    }
}

void
InitNetVars(void)
{
    short pnum;
    PLAYERp pp;

    memset(&loc, 0, sizeof(loc));

    TRAVERSE_CONNECT(pnum)
    {
        pp = Player + pnum;
        pp->movefifoend = 0;
        Player[pnum].syncvalhead = 0;
        memset(pp->inputfifo,0,sizeof(pp->inputfifo));
    }
    movefifoplc = 0;
    movefifosendplc = 0;
    syncvaltail = 0;
    syncvaltottail = 0;
    predictmovefifoplc = 0;

    memset(&syncstat, 0, sizeof(syncstat));
    memset(sync_first, 0, sizeof(sync_first));
    sync_found = FALSE;

    TRAVERSE_CONNECT(pnum)
    {
        Player[pnum].myminlag = 0;
    }

    otherminlag = mymaxlag = 0;
}

void
InitTimingVars(void)
{
    PlayClock = 0;

    // resettiming();
    totalsynctics = 0;
    totalclock = 0;
    ototalclock = 0;
    randomseed = 17L;

    MoveSkip8 = 2;
    MoveSkip2 = 0;
    MoveSkip4 = 1;                      // start slightly offset so these
    // don't move the same
    // as the Skip2's
    MoveThingsCount = 0;

    // CTW REMOVED
    //if (gTenActivated)
    //	tenResetClock();
    // CTW REMOVED END

}


void
AddSyncInfoToPacket(int *j)
{
    int sb;
    int count = 0;

    // sync testing
    while (Player[myconnectindex].syncvalhead != syncvaltail && count++ < 4)
    {
        for (sb = 0; sb < NumSyncBytes; sb++)
            packbuf[(*j)++] = Player[myconnectindex].syncval[syncvaltail & (SYNCFIFOSIZ - 1)][sb];

        syncvaltail++;
    }
}

void
faketimerhandler(void)
{
    short other, packbufleng;
    int i, j, k, l;
    PLAYERp pp;
    short pnum;
    extern SWBOOL BotMode;

#if 0
    if (inputState.GetKeyStatus(KEYSC_PERIOD))
    {
        extern unsigned int MoveThingsCount;
        MoveThingsCount++;
        MoveThingsCount--;
        return;
    }
#endif

    timerUpdate();
    if ((totalclock < ototalclock + synctics))
        return;

    if (!ready2send)
        return;

    ototalclock += synctics;

    getpackets();


// TENSW: this way we are guaranteed that the most advanced player is no more
// than 200 frames ahead of the most laggy. We're more healthy if the queue
// doesn't overflow, that's for sure.
    if (Player[myconnectindex].movefifoend - movefifoplc >= 100)
        return;

    getinput(&loc);

    AveragePacket.vel += loc.vel;
    AveragePacket.svel += loc.svel;
    AveragePacket.angvel += loc.angvel;
    AveragePacket.aimvel += loc.aimvel;
    SET(AveragePacket.bits, loc.bits);

    pp = Player + myconnectindex;

    if (pp->movefifoend & (MovesPerPacket-1))
    {
        memcpy(&pp->inputfifo[pp->movefifoend & (MOVEFIFOSIZ - 1)],
               &pp->inputfifo[(pp->movefifoend-1) & (MOVEFIFOSIZ - 1)],
               sizeof(SW_PACKET));

        pp->movefifoend++;
        return;
    }

    loc.vel = AveragePacket.vel / MovesPerPacket;
    loc.svel = AveragePacket.svel / MovesPerPacket;
    loc.angvel = AveragePacket.angvel / MovesPerPacket;
    loc.aimvel = AveragePacket.aimvel / MovesPerPacket;
    loc.bits = AveragePacket.bits;

    memset(&AveragePacket, 0, sizeof(AveragePacket));

    pp->inputfifo[Player[myconnectindex].movefifoend & (MOVEFIFOSIZ - 1)] = loc;
    pp->movefifoend++;

#if 0
//  AI Bot stuff
    if (numplayers > 1)
    {
        if (gNet.MultiGameType == MULTI_GAME_AI_BOTS)
        {
            for (i=connecthead; i>=0; i=connectpoint2[i])
            {
                if (i != myconnectindex)
                {
                    if (BotMode && Player[i].IsAI == 1) // Skip it if this player is not computer controlled!
                    {
                        computergetinput(i,&Player[i].inputfifo[Player[i].movefifoend&(MOVEFIFOSIZ-1)]);
                        Player[i].movefifoend++;
                    }
                }
            }
        }
    }
// AI Bot stuff
#endif

    if (!CommEnabled)
    {
        TRAVERSE_CONNECT(i)
        {
            if (i != myconnectindex)
            {
                if (BotMode && Player[i].IsAI == 1)
                {
                    computergetinput(i,&Player[i].inputfifo[Player[i].movefifoend&(MOVEFIFOSIZ-1)]);
                }
                else
                    memset(&Player[i].inputfifo[Player[i].movefifoend & (MOVEFIFOSIZ - 1)], 0, sizeof(Player[i].inputfifo[0]));
                Player[i].movefifoend++;
            }
        }
        return;
    }

    TRAVERSE_CONNECT(i)
    {
        if (i != myconnectindex)
        {
            k = (Player[myconnectindex].movefifoend - 1) - Player[i].movefifoend;
            Player[i].myminlag = min(Player[i].myminlag, k);
            mymaxlag = max(mymaxlag, k);
        }
    }

    if (((Player[myconnectindex].movefifoend - 1) & (TIMERUPDATESIZ - 1)) == 0)
    {
        i = mymaxlag - bufferjitter;
        mymaxlag = 0;
        if (i > 0)
            bufferjitter += ((2 + i) >> 2);
        else if (i < 0)
            bufferjitter -= ((2 - i) >> 2);
    }

    if (NetBroadcastMode)
    {
        packbuf[0] = PACKET_TYPE_BROADCAST;
        j = 1;

        if (((Player[myconnectindex].movefifoend - 1) & (TIMERUPDATESIZ - 1)) == 0 /* CTW REMOVED && !gTenActivated */)
        {
            if (myconnectindex == connecthead)
            {
                for (i = connectpoint2[connecthead]; i >= 0; i = connectpoint2[i])
                    packbuf[j++] = min(max(Player[i].myminlag, -128), 127);
            }
            else
            {
                i = Player[connecthead].myminlag - otherminlag;
                if (labs(i) > 2)
                {
                    ////DSPRINTF(ds,"lag correction: %d,%d,%d",i,Player[connecthead].myminlag,otherminlag);
                    //MONO_PRINT(ds);

                    if (labs(i) > 8)
                    {
                        if (i < 0)
                            i++;
                        i >>= 1;
                    }
                    else
                    {
                        if (i < 0)
                            i = -1;
                        if (i > 0)
                            i = 1;
                    }
                    totalclock -= synctics * i;
                    otherminlag += i;
                }
            }

            for (i = connecthead; i >= 0; i = connectpoint2[i])
                Player[i].myminlag = 0x7fffffff;
        }

        pp = Player + myconnectindex;

#if !BIT_CODEC
        memcpy(&packbuf[j], &pp->inputfifo[(Player[myconnectindex].movefifoend - 1) & (MOVEFIFOSIZ - 1)], sizeof(SW_PACKET));
        j += sizeof(SW_PACKET);
#else
        j += EncodeBits(&pp->inputfifo[(Player[myconnectindex].movefifoend - 1) & (MOVEFIFOSIZ - 1)],
                        &pp->inputfifo[(Player[myconnectindex].movefifoend - 2) & (MOVEFIFOSIZ - 1)],
                        &packbuf[j]);
#endif

#if SYNC_TEST
        AddSyncInfoToPacket(&j);
#endif

        netbroadcastpacket(packbuf, j);

        return;
    } // NetBroadcastMode

    // SLAVE CODE
    if (myconnectindex != connecthead)  // I am the Slave
    {
        if (((Player[myconnectindex].movefifoend - 1) & (TIMERUPDATESIZ - 1)) == 0)
        {
            i = Player[connecthead].myminlag - otherminlag;
            if (labs(i) > 2)
            {
                if (labs(i) > 8)
                {
                    if (i < 0)
                        i++;
                    i >>= 1;
                }
                else
                {
                    if (i < 0)
                        i = -1;
                    if (i > 0)
                        i = 1;
                }
                totalclock -= synctics * i;
                otherminlag += i;
            }

            for (i = connecthead; i >= 0; i = connectpoint2[i])
            {
                Player[i].myminlag = 0x7fffffff;
            }
        }
        packbuf[0] = PACKET_TYPE_SLAVE_TO_MASTER;
        j = 1;

        pp = Player + myconnectindex;
#if !BIT_CODEC
        memcpy(&packbuf[j], &pp->inputfifo[(pp->movefifoend - 1) & (MOVEFIFOSIZ - 1)], sizeof(SW_PACKET));
        j += sizeof(SW_PACKET);
#else
        j += EncodeBits(&pp->inputfifo[(pp->movefifoend - 1) & (MOVEFIFOSIZ - 1)],
                        &pp->inputfifo[(pp->movefifoend - 2) & (MOVEFIFOSIZ - 1)],
                        &packbuf[j]);
#endif

#if SYNC_TEST
        AddSyncInfoToPacket(&j);
#endif

        netsendpacket(connecthead, packbuf, j);
        return;
    }

    // This allows packet-resends
    //for (i = connecthead; i >= 0; i = connectpoint2[i])
    //    {
    //    if ( /* (!playerquitflag[i]) && */ (Player[i].movefifoend <= movefifosendplc))
    //        {
    //        packbuf[0] = 127;
    //        for (i = connectpoint2[connecthead]; i >= 0; i = connectpoint2[i])
    //            {
    //             /* if (!playerquitflag[i]) */ sendpacket(i, packbuf, 1);
    //            }
    //        return;
    //        }
    //    }

    // I am MASTER...
    while (1)
    {
        for (i = connecthead; i >= 0; i = connectpoint2[i])
        {
            if (/* (!playerquitflag[i]) && */ (Player[i].movefifoend <= movefifosendplc))
                return;
        }

        packbuf[0] = PACKET_TYPE_MASTER_TO_SLAVE;
        j = 1;

        // Fix timers and buffer/jitter value
        if ((movefifosendplc & (TIMERUPDATESIZ - 1)) == 0)
        {
            for (i = connectpoint2[connecthead]; i >= 0; i = connectpoint2[i])
            {
                /* if (!playerquitflag[i]) */
                packbuf[j++] = min(max(Player[i].myminlag, -128), 127);
            }

            for (i = connecthead; i >= 0; i = connectpoint2[i])
                Player[i].myminlag = 0x7fffffff;
        }

        for (i = connecthead; i >= 0; i = connectpoint2[i])
        {
            /* if (playerquitflag[i]) continue; */
            pp = Player + i;

#if !BIT_CODEC
            memcpy(&packbuf[j], &pp->inputfifo[movefifosendplc & (MOVEFIFOSIZ - 1)], sizeof(SW_PACKET));
            j += sizeof(SW_PACKET);
#else
            j += EncodeBits(&pp->inputfifo[(movefifosendplc) & (MOVEFIFOSIZ - 1)],
                            &pp->inputfifo[(movefifosendplc - 1) & (MOVEFIFOSIZ - 1)],
                            &packbuf[j]);
#endif
            //pp->movefifoend++;
        }

#if SYNC_TEST
        AddSyncInfoToPacket(&j);
#endif

        for (i = connectpoint2[connecthead]; i >= 0; i = connectpoint2[i])
        /* if (!playerquitflag[i])*/
        {
            netsendpacket(i, packbuf, j);
            /*
            pp = Player + i;
            if (TEST(pp->inputfifo[movefifosendplc & (MOVEFIFOSIZ - 1)].bits,QUITBIT)
               playerquitflag[i] = 1;
            */
        }

        movefifosendplc += MovesPerPacket;
    }
}

void
checkmasterslaveswitch(void)
{
}

void
getpackets(void)
{
    int otherconnectindex, packbufleng;
    int i, j, k, l, fifoCheck, sb;
    PLAYERp pp;
    SW_PACKET tempinput;

    timerUpdate();

    if (!CommEnabled)
        return;

    while ((packbufleng = netgetpacket(&otherconnectindex, packbuf)) > 0)
    {
        switch (packbuf[0])
        {
        case PACKET_TYPE_BROADCAST:
        case SERVER_GENERATED_BROADCAST:
            ////DSPRINTF(ds,"Receive Broadcast %d, ready2send %d",otherconnectindex, ready2send);
            //MONO_PRINT(ds);

            //ASSERT(ready2send);
            //if (!ready2send)
            //    break;

            j = 1;

            if ((Player[otherconnectindex].movefifoend & (TIMERUPDATESIZ - 1)) == 0)
            {
                if (otherconnectindex == connecthead)
                {
                    for (i = connectpoint2[connecthead]; i >= 0; i = connectpoint2[i])
                    {
                        if (i == myconnectindex)
                            otherminlag = (int)((signed char) packbuf[j]);
                        j++;
                    }
                }
            }

            pp = Player + otherconnectindex;

#if !BIT_CODEC
            memcpy(&pp->inputfifo[pp->movefifoend & (MOVEFIFOSIZ - 1)], &packbuf[j], sizeof(SW_PACKET));
            j += sizeof(SW_PACKET);
#else
            j += DecodeBits(&pp->inputfifo[(pp->movefifoend) & (MOVEFIFOSIZ - 1)],
                            &pp->inputfifo[(pp->movefifoend - 1) & (MOVEFIFOSIZ - 1)],
                            &packbuf[j]);
#endif

            pp->movefifoend++;

            // Packet Duplication
            for (i = 1; i < MovesPerPacket; i++)
            {
                memcpy(
                    &pp->inputfifo[pp->movefifoend & (MOVEFIFOSIZ - 1)],
                    &pp->inputfifo[(pp->movefifoend-1) & (MOVEFIFOSIZ - 1)],
                    sizeof(SW_PACKET));

                pp->movefifoend++;
            }

#if SYNC_TEST
            GetSyncInfoFromPacket(packbuf, packbufleng, &j, otherconnectindex);
#endif

            //DSPRINTF(ds,"Receive packet size %d",j);
            //MONO_PRINT(ds);

            break;

        case PACKET_TYPE_MASTER_TO_SLAVE:
            // Here slave is receiving
            j = 1;

            if ((Player[otherconnectindex].movefifoend & (TIMERUPDATESIZ - 1)) == 0)
            {
                for (i = connectpoint2[connecthead]; i >= 0; i = connectpoint2[i])
                {
                    // if (playerquitflag[i]) continue;
                    if (i == myconnectindex)
                        otherminlag = (int)((signed char) packbuf[j]);
                    j++;
                }
            }

            for (i = connecthead; i >= 0; i = connectpoint2[i])
            {
                /* if (playerquitflag[i]) continue;) */
                pp = Player + i;

#if !BIT_CODEC
                if (i != myconnectindex)
                    memcpy(&pp->inputfifo[pp->movefifoend & (MOVEFIFOSIZ - 1)], &packbuf[j], sizeof(SW_PACKET));
                j += sizeof(SW_PACKET);
#else
                if (i == myconnectindex)
                {
                    j += DecodeBits(&tempinput,
                                    &pp->inputfifo[(pp->movefifoend - 1) & (MOVEFIFOSIZ - 1)],
                                    &packbuf[j]);
                }
                else
                {
                    j += DecodeBits(&pp->inputfifo[(pp->movefifoend) & (MOVEFIFOSIZ - 1)],
                                    &pp->inputfifo[(pp->movefifoend - 1) & (MOVEFIFOSIZ - 1)],
                                    &packbuf[j]);
                }
#endif

                pp->movefifoend++;
            }

            while (j != packbufleng)
            {
                for (i = connecthead; i >= 0; i = connectpoint2[i])
                {
                    if (i != myconnectindex)
                    {
                        for (sb = 0; sb < NumSyncBytes; sb++)
                        {
                            Player[i].syncval[Player[i].syncvalhead & (SYNCFIFOSIZ - 1)][sb] = packbuf[j + sb];
                        }

                        Player[i].syncvalhead++;
                    }
                }

                j += NumSyncBytes;
            }

            // #if SYNC_TEST   //This doesn't work right in this case
            // GetSyncInfoFromPacket(packbufleng, &j, otherconnectindex);
            // #endif

            for (i=connecthead; i>=0; i=connectpoint2[i])
                if (i != myconnectindex)
                    for (j=1; j<MovesPerPacket; j++)
                    {
                        pp = Player + i;

                        memcpy(
                            &pp->inputfifo[pp->movefifoend & (MOVEFIFOSIZ - 1)],
                            &pp->inputfifo[(pp->movefifoend-1) & (MOVEFIFOSIZ - 1)],
                            sizeof(SW_PACKET));

                        pp->movefifoend++;
                    }

            break;

        case PACKET_TYPE_SLAVE_TO_MASTER:
            // Here master is receiving
            pp = Player + otherconnectindex;
            j = 1;

#if !BIT_CODEC
            memcpy(&pp->inputfifo[Player[otherconnectindex].movefifoend & (MOVEFIFOSIZ - 1)], &packbuf[j], sizeof(SW_PACKET));
            j += sizeof(SW_PACKET);
#else
            j += DecodeBits(&pp->inputfifo[(Player[otherconnectindex].movefifoend) & (MOVEFIFOSIZ - 1)],
                            &pp->inputfifo[(Player[otherconnectindex].movefifoend - 1) & (MOVEFIFOSIZ - 1)],
                            &packbuf[j]);
#endif

            Player[otherconnectindex].movefifoend++;

#if SYNC_TEST
            GetSyncInfoFromPacket(packbuf, packbufleng, &j, otherconnectindex);
#endif

            // Tic duping
            for (i = 1; i < MovesPerPacket; i++)
            {
                memcpy(&pp->inputfifo[(Player[otherconnectindex].movefifoend) & (MOVEFIFOSIZ - 1)],
                       &pp->inputfifo[(Player[otherconnectindex].movefifoend - 1) & (MOVEFIFOSIZ - 1)],
                       sizeof(SW_PACKET));
                Player[otherconnectindex].movefifoend++;
            }

            break;

        case PACKET_TYPE_MESSAGE:
        {
            PLAYERp tp = Player + myconnectindex;

            pp = Player + otherconnectindex;

            // retransmit if master and the message is not addressed to us
            if (!NetBroadcastMode && myconnectindex == connecthead && packbuf[1] != myconnectindex)
            {
                netsendpacket(packbuf[1], packbuf, packbufleng);
                break;
            }

            PlaySound(DIGI_PMESSAGE,tp,v3df_dontpan);

            memcpy(ds,&packbuf[3],packbufleng-3);
            ds[packbufleng-3] = 0;
            //sprintf(ds, "%s",&packbuf[3]);
            adduserquote(ds);
            break;
        }

        case PACKET_TYPE_RTS:
        {
            PACKET_RTSp p;

            p = (PACKET_RTSp)packbuf;

            PlaySoundRTS(p->RTSnum);

            break;
        }


        case PACKET_TYPE_NEW_GAME:
        {
            extern SWBOOL NewGame, ShortGameMode, DemoInitOnce;
            PACKET_NEW_GAMEp p;
            extern short TimeLimitTable[];

            pp = Player + otherconnectindex;

            // Dukes New Game Packet
            //level_number //volume_number //player_skill //monsters_off //respawn_monsters
            //respawn_items //respawn_inventory //coop //marker //friendlyfire //boardname

            p = (PACKET_NEW_GAMEp)packbuf;

            ready2send = 0;

            Level = p->Level;
            Skill = p->Skill;

            gNet.HurtTeammate = p->HurtTeammate;
            gNet.SpawnMarkers = p->SpawnMarkers;
            gNet.TeamPlay   = p->TeamPlay;
            gNet.AutoAim    = p->AutoAim;
            gNet.Nuke       = p->Nuke;
            gNet.KillLimit          = p->KillLimit*10;
            gNet.TimeLimit          = TimeLimitTable[p->TimeLimit]*60*120;

            if (ShortGameMode)
            {
                gNet.KillLimit /= 10;
                gNet.TimeLimit /= 2;
            }

            gNet.TimeLimitClock = gNet.TimeLimit;
            gNet.MultiGameType = p->GameType+1;

            // settings for No Respawn Commbat mode
            if (gNet.MultiGameType == MULTI_GAME_COMMBAT_NO_RESPAWN)
            {
                gNet.MultiGameType = MULTI_GAME_COMMBAT;
                gNet.NoRespawn = TRUE;
            }
            else
            {
                gNet.NoRespawn = FALSE;
            }

            ExitLevel = TRUE;
            NewGame = TRUE;
            // restart demo for multi-play mode
            DemoInitOnce = FALSE;

            // send a dummy packet to see when it arrives
            //tempbuf[0] = PACKET_TYPE_DUMMY;
            //sendpacket(otherconnectindex, tempbuf, 1);

            ////DSPRINTF(ds,"Level %d, Skill %d, AutoAim %d",Level, Skill, cl_autoaim);
            //MONO_PRINT(ds);

            break;
        }

        case PACKET_TYPE_DUMMY:
            ////DSPRINTF(ds,"Got Dummy Packet!!!");
            //MONO_PRINT(ds);
            break;

        case PACKET_TYPE_VERSION:
        {
            PACKET_VERSIONp p;

            pp = Player + otherconnectindex;
            p = (PACKET_VERSIONp)packbuf;

            //tenDbLprintf(gTenLog, 3, "rcv pid %d version %lx", (int) otherconnectindex, (int) p->Version);
            pp->PlayerVersion = p->Version;
            break;
        }

        case PACKET_TYPE_PLAYER_OPTIONS:
        {
            PACKET_OPTIONSp p;

            pp = Player + otherconnectindex;
            p = (PACKET_OPTIONSp)packbuf;

            // palette
            pp->TeamColor = p->Color;
            pp->SpriteP->pal = PALETTE_PLAYER0 + pp->TeamColor;
            User[pp->SpriteP - sprite]->spal = pp->SpriteP->pal;

            // names
            strcpy(pp->PlayerName, p->PlayerName);

            break;
        }

        case PACKET_TYPE_NAME_CHANGE:
        {
            PACKET_NAME_CHANGEp p;
            pp = Player + otherconnectindex;
            p = (PACKET_NAME_CHANGEp)packbuf;

            // someone else has changed their name

            DSPRINTF(ds,"Recieved name: %s",p->PlayerName);
            MONO_PRINT(ds);

            strcpy(pp->PlayerName, p->PlayerName);
            SetRedrawScreen(Player+myconnectindex);
            break;
        }


        case PACKET_TYPE_MENU_LEVEL_QUIT:
        {
            PlayerQuitMenuLevel = otherconnectindex;
            break;
        }

        case PACKET_TYPE_PLAYER_READY:
            Player[otherconnectindex].playerreadyflag++;
            // It's important to return from getpackets() when a ready packet comes in and
            // you are inside waitforeverybody(). Otherwise multiple ready packets can come
            // in inside one waitforeverybody() which causes havoc if that w4e is protecting
            // an initialization step which (heh) for example resets the playerreadyflag count.
            return;
        //break;

        case PACKET_TYPE_DONT_USE:
            break;

        case PACKET_TYPE_NULL_PACKET:
            break;

        case PACKET_TYPE_PROXY:
            break;

        default:
            DSPRINTF(ds,"Packet type unknown %d",packbuf[0]);
            MONO_PRINT(ds);
        }
    }
}
END_SW_NS