ref: 70b90f34d93eab3b1c0531a5881ffdbebfc30708
dir: /src/d_loop.c/
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// This program 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.
//
// DESCRIPTION:
// Main loop code.
//
#include <stdlib.h>
#include <string.h>
#include "doomfeatures.h"
#include "d_event.h"
#include "d_loop.h"
#include "d_ticcmd.h"
#include "i_system.h"
#include "i_timer.h"
#include "i_video.h"
#include "m_argv.h"
#include "m_fixed.h"
#include "net_client.h"
#include "net_gui.h"
#include "net_io.h"
#include "net_query.h"
#include "net_server.h"
#include "net_sdl.h"
#include "net_loop.h"
// The complete set of data for a particular tic.
typedef struct
{
ticcmd_t cmds[NET_MAXPLAYERS];
boolean ingame[NET_MAXPLAYERS];
} ticcmd_set_t;
// Maximum time that we wait in TryRunTics() for netgame data to be
// received before we bail out and render a frame anyway.
// Vanilla Doom used 20 for this value, but we use a smaller value
// instead for better responsiveness of the menu when we're stuck.
#define MAX_NETGAME_STALL_TICS 5
//
// gametic is the tic about to (or currently being) run
// maketic is the tic that hasn't had control made for it yet
// recvtic is the latest tic received from the server.
//
// a gametic cannot be run until ticcmds are received for it
// from all players.
//
static ticcmd_set_t ticdata[BACKUPTICS];
// The index of the next tic to be made (with a call to BuildTiccmd).
static int maketic;
// The number of complete tics received from the server so far.
static int recvtic;
// The number of tics that have been run (using RunTic) so far.
int gametic;
// When set to true, a single tic is run each time TryRunTics() is called.
// This is used for -timedemo mode.
boolean singletics = false;
// Index of the local player.
static int localplayer;
// Used for original sync code.
static int skiptics = 0;
// Reduce the bandwidth needed by sampling game input less and transmitting
// less. If ticdup is 2, sample half normal, 3 = one third normal, etc.
int ticdup;
// Amount to offset the timer for game sync.
fixed_t offsetms;
// Use new client syncronisation code
static boolean new_sync = true;
// Callback functions for loop code.
static loop_interface_t *loop_interface = NULL;
// Current players in the multiplayer game.
// This is distinct from playeringame[] used by the game code, which may
// modify playeringame[] when playing back multiplayer demos.
static boolean local_playeringame[NET_MAXPLAYERS];
// Requested player class "sent" to the server on connect.
// If we are only doing a single player game then this needs to be remembered
// and saved in the game settings.
static int player_class;
// 35 fps clock adjusted by offsetms milliseconds
static int GetAdjustedTime(void)
{
int time_ms;
time_ms = I_GetTimeMS();
if (new_sync)
{
// Use the adjustments from net_client.c only if we are
// using the new sync mode.
time_ms += (offsetms / FRACUNIT);
}
return (time_ms * TICRATE) / 1000;
}
static boolean BuildNewTic(void)
{
int gameticdiv;
ticcmd_t cmd;
gameticdiv = gametic/ticdup;
I_StartTic ();
loop_interface->ProcessEvents();
// Always run the menu
loop_interface->RunMenu();
if (drone)
{
// In drone mode, do not generate any ticcmds.
return false;
}
if (new_sync)
{
// If playing single player, do not allow tics to buffer
// up very far
if (!net_client_connected && maketic - gameticdiv > 2)
return false;
// Never go more than ~200ms ahead
if (maketic - gameticdiv > 8)
return false;
}
else
{
if (maketic - gameticdiv >= 5)
return false;
}
//printf ("mk:%i ",maketic);
memset(&cmd, 0, sizeof(ticcmd_t));
loop_interface->BuildTiccmd(&cmd, maketic);
#ifdef FEATURE_MULTIPLAYER
if (net_client_connected)
{
NET_CL_SendTiccmd(&cmd, maketic);
}
#endif
ticdata[maketic % BACKUPTICS].cmds[localplayer] = cmd;
ticdata[maketic % BACKUPTICS].ingame[localplayer] = true;
++maketic;
return true;
}
//
// NetUpdate
// Builds ticcmds for console player,
// sends out a packet
//
int lasttime;
void NetUpdate (void)
{
int nowtime;
int newtics;
int i;
// If we are running with singletics (timing a demo), this
// is all done separately.
if (singletics)
return;
#ifdef FEATURE_MULTIPLAYER
// Run network subsystems
NET_CL_Run();
NET_SV_Run();
#endif
// check time
nowtime = GetAdjustedTime() / ticdup;
newtics = nowtime - lasttime;
lasttime = nowtime;
if (skiptics <= newtics)
{
newtics -= skiptics;
skiptics = 0;
}
else
{
skiptics -= newtics;
newtics = 0;
}
// build new ticcmds for console player
for (i=0 ; i<newtics ; i++)
{
if (!BuildNewTic())
{
break;
}
}
}
static void D_Disconnected(void)
{
// In drone mode, the game cannot continue once disconnected.
if (drone)
{
I_Error("Disconnected from server in drone mode.");
}
// disconnected from server
printf("Disconnected from server.\n");
}
//
// Invoked by the network engine when a complete set of ticcmds is
// available.
//
void D_ReceiveTic(ticcmd_t *ticcmds, boolean *players_mask)
{
int i;
// Disconnected from server?
if (ticcmds == NULL && players_mask == NULL)
{
D_Disconnected();
return;
}
for (i = 0; i < NET_MAXPLAYERS; ++i)
{
if (!drone && i == localplayer)
{
// This is us. Don't overwrite it.
}
else
{
ticdata[recvtic % BACKUPTICS].cmds[i] = ticcmds[i];
ticdata[recvtic % BACKUPTICS].ingame[i] = players_mask[i];
}
}
++recvtic;
}
//
// Start game loop
//
// Called after the screen is set but before the game starts running.
//
void D_StartGameLoop(void)
{
lasttime = GetAdjustedTime() / ticdup;
}
//
// Block until the game start message is received from the server.
//
static void BlockUntilStart(net_gamesettings_t *settings,
netgame_startup_callback_t callback)
{
while (!NET_CL_GetSettings(settings))
{
NET_CL_Run();
NET_SV_Run();
if (!net_client_connected)
{
I_Error("Lost connection to server");
}
if (callback != NULL && !callback(net_client_wait_data.ready_players,
net_client_wait_data.num_players))
{
I_Error("Netgame startup aborted.");
}
I_Sleep(100);
}
}
void D_StartNetGame(net_gamesettings_t *settings,
netgame_startup_callback_t callback)
{
int i;
offsetms = 0;
recvtic = 0;
settings->consoleplayer = 0;
settings->num_players = 1;
settings->player_classes[0] = player_class;
//!
// @category net
//
// Use new network client sync code rather than the classic
// sync code. This is currently disabled by default because it
// has some bugs.
//
if (M_CheckParm("-newsync") > 0)
settings->new_sync = 1;
else
settings->new_sync = 0;
// TODO: New sync code is not enabled by default because it's
// currently broken.
//if (M_CheckParm("-oldsync") > 0)
// settings->new_sync = 0;
//else
// settings->new_sync = 1;
//!
// @category net
// @arg <n>
//
// Send n extra tics in every packet as insurance against dropped
// packets.
//
i = M_CheckParmWithArgs("-extratics", 1);
if (i > 0)
settings->extratics = atoi(myargv[i+1]);
else
settings->extratics = 1;
//!
// @category net
// @arg <n>
//
// Reduce the resolution of the game by a factor of n, reducing
// the amount of network bandwidth needed.
//
i = M_CheckParmWithArgs("-dup", 1);
if (i > 0)
settings->ticdup = atoi(myargv[i+1]);
else
settings->ticdup = 1;
if (net_client_connected)
{
// Send our game settings and block until game start is received
// from the server.
NET_CL_StartGame(settings);
BlockUntilStart(settings, callback);
// Read the game settings that were received.
NET_CL_GetSettings(settings);
}
if (drone)
{
settings->consoleplayer = 0;
}
// Set the local player and playeringame[] values.
localplayer = settings->consoleplayer;
for (i = 0; i < NET_MAXPLAYERS; ++i)
{
local_playeringame[i] = i < settings->num_players;
}
// Copy settings to global variables.
ticdup = settings->ticdup;
new_sync = settings->new_sync;
// TODO: Message disabled until we fix new_sync.
//if (!new_sync)
//{
// printf("Syncing netgames like Vanilla Doom.\n");
//}
}
boolean D_InitNetGame(net_connect_data_t *connect_data)
{
boolean result = false;
net_addr_t *addr = NULL;
int i;
// Call D_QuitNetGame on exit:
I_AtExit(D_QuitNetGame, true);
player_class = connect_data->player_class;
#ifdef FEATURE_MULTIPLAYER
//!
// @category net
//
// Start a multiplayer server, listening for connections.
//
if (M_CheckParm("-server") > 0
|| M_CheckParm("-privateserver") > 0)
{
NET_SV_Init();
NET_SV_AddModule(&net_loop_server_module);
NET_SV_AddModule(&net_sdl_module);
NET_SV_RegisterWithMaster();
net_loop_client_module.InitClient();
addr = net_loop_client_module.ResolveAddress(NULL);
}
else
{
//!
// @category net
//
// Automatically search the local LAN for a multiplayer
// server and join it.
//
i = M_CheckParm("-autojoin");
if (i > 0)
{
addr = NET_FindLANServer();
if (addr == NULL)
{
I_Error("No server found on local LAN");
}
}
//!
// @arg <address>
// @category net
//
// Connect to a multiplayer server running on the given
// address.
//
i = M_CheckParmWithArgs("-connect", 1);
if (i > 0)
{
net_sdl_module.InitClient();
addr = net_sdl_module.ResolveAddress(myargv[i+1]);
if (addr == NULL)
{
I_Error("Unable to resolve '%s'\n", myargv[i+1]);
}
}
}
if (addr != NULL)
{
if (M_CheckParm("-drone") > 0)
{
connect_data->drone = true;
}
if (!NET_CL_Connect(addr, connect_data))
{
I_Error("D_InitNetGame: Failed to connect to %s\n",
NET_AddrToString(addr));
}
printf("D_InitNetGame: Connected to %s\n", NET_AddrToString(addr));
// Wait for launch message received from server.
NET_WaitForLaunch();
result = true;
}
#endif
return result;
}
//
// D_QuitNetGame
// Called before quitting to leave a net game
// without hanging the other players
//
void D_QuitNetGame (void)
{
#ifdef FEATURE_MULTIPLAYER
NET_SV_Shutdown();
NET_CL_Disconnect();
#endif
}
static int GetLowTic(void)
{
int lowtic;
lowtic = maketic;
#ifdef FEATURE_MULTIPLAYER
if (net_client_connected)
{
if (drone || recvtic < lowtic)
{
lowtic = recvtic;
}
}
#endif
return lowtic;
}
static int frameon;
static int frameskip[4];
static int oldnettics;
static void OldNetSync(void)
{
unsigned int i;
int keyplayer = -1;
frameon++;
// ideally maketic should be 1 - 3 tics above lowtic
// if we are consistantly slower, speed up time
for (i=0 ; i<NET_MAXPLAYERS ; i++)
{
if (local_playeringame[i])
{
keyplayer = i;
break;
}
}
if (keyplayer < 0)
{
// If there are no players, we can never advance anyway
return;
}
if (localplayer == keyplayer)
{
// the key player does not adapt
}
else
{
if (maketic <= recvtic)
{
lasttime--;
// printf ("-");
}
frameskip[frameon & 3] = oldnettics > recvtic;
oldnettics = maketic;
if (frameskip[0] && frameskip[1] && frameskip[2] && frameskip[3])
{
skiptics = 1;
// printf ("+");
}
}
}
// Returns true if there are players in the game:
static boolean PlayersInGame(void)
{
boolean result = false;
unsigned int i;
// If we are connected to a server, check if there are any players
// in the game.
if (net_client_connected)
{
for (i = 0; i < NET_MAXPLAYERS; ++i)
{
result = result || local_playeringame[i];
}
}
// Whether single or multi-player, unless we are running as a drone,
// we are in the game.
if (!drone)
{
result = true;
}
return result;
}
// When using ticdup, certain values must be cleared out when running
// the duplicate ticcmds.
static void TicdupSquash(ticcmd_set_t *set)
{
ticcmd_t *cmd;
unsigned int i;
for (i = 0; i < NET_MAXPLAYERS ; ++i)
{
cmd = &set->cmds[i];
cmd->chatchar = 0;
if (cmd->buttons & BT_SPECIAL)
cmd->buttons = 0;
}
}
// When running in single player mode, clear all the ingame[] array
// except the local player.
static void SinglePlayerClear(ticcmd_set_t *set)
{
unsigned int i;
for (i = 0; i < NET_MAXPLAYERS; ++i)
{
if (i != localplayer)
{
set->ingame[i] = false;
}
}
}
//
// TryRunTics
//
void TryRunTics (void)
{
int i;
int lowtic;
int entertic;
static int oldentertics;
int realtics;
int availabletics;
int counts;
// get real tics
entertic = I_GetTime() / ticdup;
realtics = entertic - oldentertics;
oldentertics = entertic;
// in singletics mode, run a single tic every time this function
// is called.
if (singletics)
{
BuildNewTic();
}
else
{
NetUpdate ();
}
lowtic = GetLowTic();
availabletics = lowtic - gametic/ticdup;
// decide how many tics to run
if (new_sync)
{
counts = availabletics;
}
else
{
// 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;
if (net_client_connected)
{
OldNetSync();
}
}
if (counts < 1)
counts = 1;
// wait for new tics if needed
while (!PlayersInGame() || lowtic < gametic/ticdup + counts)
{
NetUpdate ();
lowtic = GetLowTic();
if (lowtic < gametic/ticdup)
I_Error ("TryRunTics: lowtic < gametic");
// Still no tics to run? Sleep until some are available.
if (lowtic < gametic/ticdup + counts)
{
// If we're in a netgame, we might spin forever waiting for
// new network data to be received. So don't stay in here
// forever - give the menu a chance to work.
if (I_GetTime() / ticdup - entertic >= MAX_NETGAME_STALL_TICS)
{
return;
}
I_Sleep(1);
}
}
// run the count * ticdup dics
while (counts--)
{
ticcmd_set_t *set;
if (!PlayersInGame())
{
return;
}
set = &ticdata[(gametic / ticdup) % BACKUPTICS];
if (!net_client_connected)
{
SinglePlayerClear(set);
}
for (i=0 ; i<ticdup ; i++)
{
if (gametic/ticdup > lowtic)
I_Error ("gametic>lowtic");
memcpy(local_playeringame, set->ingame, sizeof(local_playeringame));
loop_interface->RunTic(set->cmds, set->ingame);
gametic++;
// modify command for duplicated tics
TicdupSquash(set);
}
NetUpdate (); // check for new console commands
}
}
void D_RegisterLoopCallbacks(loop_interface_t *i)
{
loop_interface = i;
}