Serious-Engine/Sources/Engine/Network/PlayerBuffer.cpp

152 lines
4.0 KiB
C++
Raw Normal View History

2016-03-12 01:20:51 +01:00
/* Copyright (c) 2002-2012 Croteam Ltd.
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License as published by
the Free Software Foundation
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. */
2016-03-11 14:57:17 +01:00
#include "stdh.h"
#include <Engine/Base/Console.h>
#include <Engine/Network/PlayerBuffer.h>
/*
* Constructor.
*/
CPlayerBuffer::CPlayerBuffer(void) {
plb_Active = FALSE;
plb_abReceived.Clear();
plb_paLastAction.Clear();
plb_iClient = -1;
}
/*
* Destructor.
*/
CPlayerBuffer::~CPlayerBuffer(void) {
}
/*
* Activate player buffer for a new player.
*/
void CPlayerBuffer::Activate(INDEX iClient)
{
ASSERT(!plb_Active);
plb_Active = TRUE;
plb_iClient = iClient;
// make packets dummy before receiving something
plb_abReceived.Clear();
plb_paLastAction.Clear();
}
/*
* Deactivate player data for removed player.
*/
void CPlayerBuffer::Deactivate(void)
{
ASSERT(plb_Active);
plb_Active = FALSE;
plb_iClient = -1;
}
/*
* Receive action packet from player source.
*/
void CPlayerBuffer::ReceiveActionPacket(CNetworkMessage *pnm, INDEX iMaxBuffer)
{
ASSERT(plb_Active);
// receive new action
CPlayerAction pa;
(*pnm)>>pa;
// buffer it
plb_abReceived.AddAction(pa);
// read sendbehind
INDEX iSendBehind = 0;
pnm->ReadBits(&iSendBehind, 2);
// foreach resent action
for(INDEX i=0; i<iSendBehind; i++) {
CPlayerAction paOld;
(*pnm)>>paOld;
// if not already sent out back to the client
if (paOld.pa_llCreated>plb_paLastAction.pa_llCreated) {
// buffer it
plb_abReceived.AddAction(paOld);
}
}
/*
INDEX ctBuffered = plb_abReceived.GetCount();
if (ctBuffered>net_iPlayerBufferActions) {
CPrintF("Receive: BUFFER FULL (%d) ++++++++++++++\n", ctBuffered);
}
CPrintF("Receive: buffered %d\n", ctBuffered);
*/
// while there are more too many actions buffered
while(plb_abReceived.GetCount()>iMaxBuffer) {
// purge the oldest one
plb_abReceived.RemoveOldest();
}
}
/* Create action packet for player target from oldest buffered action. */
// (prepares lag info for given client number)
void CPlayerBuffer::CreateActionPacket(CNetworkMessage *pnm, INDEX iClient)
{
ASSERT(plb_Active);
CPlayerAction paCurrent;
//CPrintF("Send: buffered %d\n", plb_abReceived.GetCount());
// if there are any buffered actions
if (plb_abReceived.GetCount()>0) {
// retrieve the oldest one
plb_abReceived.GetActionByIndex(0, paCurrent);
// if there are no buffered actions
} else {
// reuse the last one
paCurrent = plb_paLastAction;
//CPrintF("Send: BUFFER EMPTY ---------\n");
}
// create a new delta action packet between last sent and current action
CPlayerAction paDelta;
for (INDEX i=0; i<sizeof(CPlayerAction); i++) {
((UBYTE*)&paDelta)[i] = ((UBYTE*)&paCurrent)[i] ^ ((UBYTE*)&plb_paLastAction)[i];
}
// if the client that message is sent to owns the player
if (iClient==plb_iClient) {
// send delta of the timetag
paDelta.pa_llCreated = paCurrent.pa_llCreated-plb_paLastAction.pa_llCreated;
// if the client doesn't own the player
} else {
// no timetag information
paDelta.pa_llCreated = 0;
}
// send the delta packet
(*pnm)<<paDelta;
}
/* Advance action buffer by one tick by removing oldest action. */
void CPlayerBuffer::AdvanceActionBuffer(void)
{
ASSERT(plb_Active);
// if there are any buffered actions
if (plb_abReceived.GetCount()>0) {
// get the oldest one and remove it
CPlayerAction paCurrent;
plb_abReceived.GetActionByIndex(0, paCurrent);
plb_abReceived.RemoveOldest();
// move current action to last action
plb_paLastAction = paCurrent;
}
}