d_net.c

// SONIC ROBO BLAST 2
//-----------------------------------------------------------------------------
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 1998-2000 by DooM Legacy Team.
// Copyright (C) 1999-2020 by Sonic Team Junior.
//
// This program is free software distributed under the
// terms of the GNU General Public License, version 2.
// See the 'LICENSE' file for more details.
//-----------------------------------------------------------------------------
/// \file  d_net.c
/// \brief SRB2 network game communication and protocol, all OS independent parts.
//
///        Implement a Sliding window protocol without receiver window
///        (out of order reception)
///        This protocol uses a mix of "goback n" and "selective repeat" implementation
///        The NOTHING packet is sent when connection is idle to acknowledge packets

#include "doomdef.h"
#include "g_game.h"
#include "i_net.h"
#include "i_system.h"
#include "m_argv.h"
#include "d_net.h"
#include "w_wad.h"
#include "d_netfil.h"
#include "d_clisrv.h"
#include "z_zone.h"
#include "i_tcp.h"
#include "d_main.h" // srb2home

//
// NETWORKING
//
// gametic is the tic about to (or currently being) run
// Server:
//   maketic is the tic that hasn't had control made for it yet
//   nettics is the tic for each node
//   firstticstosend is the lowest value of nettics
// Client:
//   neededtic is the tic needed by the client to run the game
//   firstticstosend is used to optimize a condition
// Normally maketic >= gametic > 0

#define FORCECLOSE 0x8000
tic_t connectiontimeout = (10*TICRATE);

/// \brief network packet
doomcom_t *doomcom = NULL;
/// \brief network packet data, points inside doomcom
doomdata_t *netbuffer = NULL;

#ifdef DEBUGFILE
FILE *debugfile = NULL; // put some net info in a file during the game
#endif

#define MAXREBOUND 8
static doomdata_t reboundstore[MAXREBOUND];
static INT16 reboundsize[MAXREBOUND];
static INT32 rebound_head, rebound_tail;

/// \brief bandwith of netgame
INT32 net_bandwidth;

/// \brief max length per packet
INT16 hardware_MAXPACKETLENGTH;

boolean (*I_NetGet)(void) = NULL;
void (*I_NetSend)(void) = NULL;
boolean (*I_NetCanSend)(void) = NULL;