Engine:
* Forgot to remove one line in last commit.
(*
* Hedgewars, a free turn based strategy game
* Copyright (c) 2004, 2005, 2007, 2008 Andrey Korotaev <unC0Rr@gmail.com>
*
* 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; version 2 of the License
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*)
{$INCLUDE "options.inc"}
unit uIO;
interface
uses SDLh;
var ipcPort: Word;
hiTicks: Word;
procedure init_uIO;
procedure free_uIO;
procedure SendIPC(s: shortstring);
procedure SendIPCXY(cmd: char; X, Y: SmallInt);
procedure SendIPCRaw(p: pointer; len: Longword);
procedure SendIPCAndWaitReply(s: shortstring);
procedure SendIPCTimeInc;
procedure SendKeepAliveMessage(Lag: Longword);
procedure LoadRecordFromFile(fileName: shortstring);
procedure IPCWaitPongEvent;
procedure IPCCheckSock;
procedure InitIPC;
procedure CloseIPC;
procedure NetGetNextCmd;
implementation
uses uConsole, uConsts, uWorld, uMisc, uLand, uChat, uTeams;
type PCmd = ^TCmd;
TCmd = packed record
Next: PCmd;
loTime: Word;
case byte of
1: (len: byte;
cmd: Char;
X, Y: SmallInt);
2: (str: shortstring);
end;
var IPCSock: PTCPSocket;
fds: PSDLNet_SocketSet;
isPonged: boolean;
headcmd: PCmd;
lastcmd: PCmd;
SendEmptyPacketTicks: LongWord;
function AddCmd(Time: Word; str: shortstring): PCmd;
var command: PCmd;
begin
new(command);
FillChar(command^, sizeof(TCmd), 0);
command^.loTime:= Time;
command^.str:= str;
if command^.cmd <> 'F' then dec(command^.len, 2); // cut timestamp
if headcmd = nil then
begin
headcmd:= command;
lastcmd:= command
end else
begin
lastcmd^.Next:= command;
lastcmd:= command
end;
AddCmd:= command;
end;
procedure RemoveCmd;
var tmp: PCmd;
begin
TryDo(headcmd <> nil, 'Engine bug: headcmd = nil', true);
tmp:= headcmd;
headcmd:= headcmd^.Next;
if headcmd = nil then lastcmd:= nil;
dispose(tmp)
end;
procedure InitIPC;
var ipaddr: TIPAddress;
begin
WriteToConsole('Init SDL_Net... ');
SDLTry(SDLNet_Init = 0, true);
fds:= SDLNet_AllocSocketSet(1);
SDLTry(fds <> nil, true);
WriteLnToConsole(msgOK);
WriteToConsole('Establishing IPC connection... ');
SDLTry(SDLNet_ResolveHost(ipaddr, '127.0.0.1', ipcPort) = 0, true);
IPCSock:= SDLNet_TCP_Open(ipaddr);
SDLTry(IPCSock <> nil, true);
WriteLnToConsole(msgOK)
end;
procedure CloseIPC;
begin
SDLNet_FreeSocketSet(fds);
SDLNet_TCP_Close(IPCSock);
SDLNet_Quit();
end;
procedure ParseIPCCommand(s: shortstring);
var loTicks: Word;
begin
case s[1] of
'!': begin {$IFDEF DEBUGFILE}AddFileLog('Ping? Pong!');{$ENDIF}isPonged:= true; end;
'?': SendIPC('!');
'e': ParseCommand(copy(s, 2, Length(s) - 1), true);
'E': OutError(copy(s, 2, Length(s) - 1), true);
'W': OutError(copy(s, 2, Length(s) - 1), false);
'M': CheckLandDigest(s);
'T': case s[2] of
'L': GameType:= gmtLocal;
'D': GameType:= gmtDemo;
'N': GameType:= gmtNet;
'S': GameType:= gmtSave;
else OutError(errmsgIncorrectUse + ' IPC "T" :' + s[2], true) end;
else
loTicks:= SDLNet_Read16(@s[byte(s[0]) - 1]);
AddCmd(loTicks, s);
{$IFDEF DEBUGFILE}AddFileLog('IPC in: '+s[1]+' ticks '+inttostr(lastcmd^.loTime));{$ENDIF}
end
end;
procedure IPCCheckSock;
const ss: shortstring = '';
var i: LongInt;
buf: array[0..255] of byte;
s: shortstring absolute buf;
begin
if IPCSock = nil then
exit;
fds^.numsockets:= 0;
SDLNet_AddSocket(fds, IPCSock);
while SDLNet_CheckSockets(fds, 0) > 0 do
begin
i:= SDLNet_TCP_Recv(IPCSock, @buf[1], 255 - Length(ss));
if i > 0 then
begin
buf[0]:= i;
ss:= ss + s;
while (Length(ss) > 1) and (Length(ss) > byte(ss[1])) do
begin
ParseIPCCommand(copy(ss, 2, byte(ss[1])));
Delete(ss, 1, Succ(byte(ss[1])))
end
end else OutError('IPC connection lost', true)
end;
end;
procedure LoadRecordFromFile(fileName: shortstring);
var f: file;
ss: shortstring = '';
i: LongInt;
buf: array[0..255] of byte;
s: shortstring absolute buf;
begin
// set RDNLY on file open
filemode:= 0;
assign(f, fileName);
reset(f, 1);
repeat
BlockRead(f, buf[1], 255 - Length(ss), i);
if i > 0 then
begin
buf[0]:= i;
ss:= ss + s;
while (Length(ss) > 1)and(Length(ss) > byte(ss[1])) do
begin
ParseIPCCommand(copy(ss, 2, byte(ss[1])));
Delete(ss, 1, Succ(byte(ss[1])))
end
end
until i = 0;
close(f)
end;
procedure SendIPC(s: shortstring);
begin
if IPCSock <> nil then
begin
SendEmptyPacketTicks:= 0;
if s[0]>#251 then s[0]:= #251;
SDLNet_Write16(GameTicks, @s[Succ(byte(s[0]))]);
{$IFDEF DEBUGFILE}AddFileLog('IPC send: '+ s[1]);{$ENDIF}
inc(s[0], 2);
SDLNet_TCP_Send(IPCSock, @s, Succ(byte(s[0])))
end
end;
procedure SendIPCRaw(p: pointer; len: Longword);
begin
if IPCSock <> nil then
begin
SDLNet_TCP_Send(IPCSock, p, len)
end
end;
procedure SendIPCXY(cmd: char; X, Y: SmallInt);
var s: shortstring;
begin
s[0]:= #5;
s[1]:= cmd;
SDLNet_Write16(X, @s[2]);
SDLNet_Write16(Y, @s[4]);
SendIPC(s)
end;
procedure SendIPCTimeInc;
const timeinc: shortstring = '#';
begin
SendIPCRaw(@timeinc, 2)
end;
procedure IPCWaitPongEvent;
begin
isPonged:= false;
repeat
IPCCheckSock;
SDL_Delay(1)
until isPonged
end;
procedure SendIPCAndWaitReply(s: shortstring);
begin
SendIPC(s);
SendIPC('?');
IPCWaitPongEvent
end;
procedure SendKeepAliveMessage(Lag: Longword);
begin
inc(SendEmptyPacketTicks, Lag);
if (SendEmptyPacketTicks >= cSendEmptyPacketTime) then
SendIPC('+')
end;
procedure NetGetNextCmd;
var tmpflag: boolean;
s: shortstring;
x16, y16: SmallInt;
begin
tmpflag:= true;
while (headcmd <> nil)
and (tmpflag or (headcmd^.cmd = '#')) // '#' is the only cmd which can be sent within same tick after 'N'
and ((GameTicks = hiTicks shl 16 + headcmd^.loTime)
or (headcmd^.cmd = 's') // for these commands time is not specified
or (headcmd^.cmd = '#')
or (headcmd^.cmd = 'b')
or (headcmd^.cmd = 'F')) do
begin
case headcmd^.cmd of
'+': ; // do nothing - it is just an empty packet
'#': inc(hiTicks);
'L': ParseCommand('+left', true);
'l': ParseCommand('-left', true);
'R': ParseCommand('+right', true);
'r': ParseCommand('-right', true);
'U': ParseCommand('+up', true);
'u': ParseCommand('-up', true);
'D': ParseCommand('+down', true);
'd': ParseCommand('-down', true);
'Z': ParseCommand('+precise', true);
'z': ParseCommand('-precise', true);
'A': ParseCommand('+attack', true);
'a': ParseCommand('-attack', true);
'S': ParseCommand('switch', true);
'j': ParseCommand('ljump', true);
'J': ParseCommand('hjump', true);
',': ParseCommand('skip', true);
's': begin
s:= copy(headcmd^.str, 2, Pred(headcmd^.len));
AddChatString(s);
WriteLnToConsole(s)
end;
'b': begin
s:= copy(headcmd^.str, 2, Pred(headcmd^.len));
AddChatString(#4 + s);
WriteLnToConsole(s)
end;
'F': TeamGone(copy(headcmd^.str, 2, Pred(headcmd^.len)));
'N': begin
tmpflag:= false;
{$IFDEF DEBUGFILE}AddFileLog('got cmd "N": time '+inttostr(hiTicks shl 16 + headcmd^.loTime)){$ENDIF}
end;
'p': begin
x16:= SDLNet_Read16(@(headcmd^.X));
y16:= SDLNet_Read16(@(headcmd^.Y));
doPut(x16, y16, false)
end;
'P': begin
// these are equations solved for CursorPoint
// SDLNet_Read16(@(headcmd^.X)) == CursorPoint.X - WorldDx;
// SDLNet_Read16(@(headcmd^.Y)) == cScreenHeight - CursorPoint.Y - WorldDy;
CursorPoint.X:= SmallInt(SDLNet_Read16(@(headcmd^.X))) + WorldDx;
CursorPoint.Y:= cScreenHeight - SmallInt(SDLNet_Read16(@(headcmd^.Y))) - WorldDy;
end;
'w': ParseCommand('setweap ' + headcmd^.str[2], true);
't': ParseCommand('taunt ' + headcmd^.str[2], true);
'g': ParseCommand('newgrave', true);
'h': ParseCommand('hogsay ' + copy(headcmd^.str, 2, Pred(headcmd^.len)), true);
'1'..'5': ParseCommand('timer ' + headcmd^.cmd, true);
#128..char(128 + cMaxSlotIndex): ParseCommand('slot ' + char(byte(headcmd^.cmd) - 79), true)
else
OutError('Unexpected protocol command: ' + headcmd^.cmd, True)
end;
RemoveCmd
end;
if (headcmd <> nil) and tmpflag and (not CurrentTeam^.hasGone) then
TryDo(GameTicks < hiTicks shl 16 + headcmd^.loTime,
'oops, queue error. in buffer: ' + headcmd^.cmd +
' (' + inttostr(GameTicks) + ' > ' +
inttostr(hiTicks shl 16 + headcmd^.loTime) + ')',
true);
isInLag:= (headcmd = nil) and tmpflag and (not CurrentTeam^.hasGone);
if isInLag then fastUntilLag:= false
end;
procedure init_uIO;
begin
IPCSock:= nil;
headcmd:= nil;
lastcmd:= nil;
isPonged:= false; // was const
hiTicks:= 0;
SendEmptyPacketTicks:= 0;
ipcPort:= 0;
end;
procedure free_uIO;
begin
end;
end.