/*
==================
CL_DeltaEntity
Parses deltas from the given base and adds the resulting entity
to the current frame
==================
*/
void DeltaEntity(NetBuffer msg, clSnapshot_t frame, int newnum, Common.entityState_t old, bool unchanged)
{
// save the parsed entity state into the big circular buffer so
// it can be used as the source for a later delta
Common.entityState_t state = cl.parseEntities[cl.parseEntitiesNum & 2047];
if (unchanged)
state = old;
else
Net.Instance.MSG_ReadDeltaEntity(msg, ref old, ref state, newnum);
cl.parseEntities[cl.parseEntitiesNum & 2047] = state;
if (state.number == 1023)
return; // entity was delta removed
cl.parseEntitiesNum++;
frame.numEntities++;
}
public clientActive()
{
gamestate = new gameState_t();
gamestate.data = new Dictionary<int, string>();
for (int i = 0; i < parseEntities.Length; i++)
{
parseEntities[i] = new Common.entityState_t();
}
for (int i = 0; i < entityBaselines.Length; i++)
{
entityBaselines[i] = new Common.entityState_t();
}
for (int i = 0; i < snapshots.Length; i++)
{
snapshots[i] = new clSnapshot_t();
}
}
/*
================
CL_ParseSnapshot
If the snapshot is parsed properly, it will be copied to
cl.snap and saved in cl.snapshots[]. If the snapshot is invalid
for any reason, no changes to the state will be made at all.
================
*/
void ParseSnapshot(NetBuffer msg)
{
// read in the new snapshot to a temporary buffer
// we will only copy to cl.snap if it is valid
clSnapshot_t newsnap = new clSnapshot_t();
clSnapshot_t old;
// we will have read any new server commands in this
// message before we got to svc_snapshot
newsnap.ServerCommandNum = clc.serverCommandSequence;
newsnap.serverTime = msg.ReadInt32();
newsnap.messageNum = clc.serverMessageSequence;
int deltaNum = msg.ReadByte();
if (deltaNum <= 0)
{
newsnap.deltaNum = -1;
}
else
newsnap.deltaNum = newsnap.messageNum - deltaNum;
newsnap.snapFlags = msg.ReadByte();
// If the frame is delta compressed from data that we
// no longer have available, we must suck up the rest of
// the frame, but not use it, then ask for a non-compressed
// message
if (newsnap.deltaNum <= 0)
{
newsnap.valid = true; // uncompressed frame
old = null;
}
else
{
old = cl.snapshots[newsnap.deltaNum & 31];
if (!old.valid)
{
// should never happen
Common.Instance.WriteLine("ParseSnapshot: Delta from invalid frame (not supposed to happen!).");
}
else if (old.messageNum != newsnap.deltaNum)
{
// The frame that the server did the delta from
// is too old, so we can't reconstruct it properly.
Common.Instance.WriteLine("ParseSnapshot: Delta frame too old.");
}
else if (cl.parseEntitiesNum - old.parseEntitiesNum > 2048 - 128)
{
Common.Instance.WriteLine("ParseSnapshot: Delta parseEntitiesNum too old");
}
else
newsnap.valid = true; // valid delta parse
}
// read areamask
int len = msg.ReadByte();
newsnap.areamask = msg.ReadBytes(32);
// read playerinfo
if (old != null)
{
Net.ReadDeltaPlayerstate(msg, old.ps, newsnap.ps);
}
else
Net.ReadDeltaPlayerstate(msg, null, newsnap.ps);
// read packet entities
ParsePacketEntities(msg, old, newsnap);
// if not valid, dump the entire thing now that it has
// been properly read
if (!newsnap.valid)
return;
// clear the valid flags of any snapshots between the last
// received and this one, so if there was a dropped packet
// it won't look like something valid to delta from next
// time we wrap around in the buffer
int oldMessageNum = cl.snap.messageNum + 1;
if (newsnap.messageNum - oldMessageNum >= 32)
{
oldMessageNum = newsnap.messageNum - 31;
}
for (; oldMessageNum < newsnap.messageNum; oldMessageNum++ )
{
cl.snapshots[oldMessageNum & 31].valid = false;
}
// copy to the current good spot
cl.snap = newsnap;
cl.snap.ping = 999;
// calculate ping time
for (int i = 0; i < 32; i++)
{
int packetNum = (clc.netchan.outgoingSequence - 1 - i) & 31;
if (cl.snap.ps.commandTime >= cl.outPackets[packetNum].p_serverTime)
{
cl.snap.ping = realtime - cl.outPackets[packetNum].p_realtime;
break;
}
}
// save the frame off in the backup array for later delta comparisons
cl.snapshots[cl.snap.messageNum & 31] = cl.snap;
//Common.Instance.WriteLine(" Snapshot:{0} delta:{1} ping:{2}", cl.snap.messageNum, cl.snap.deltaNum, cl.snap.ping);
cl.newSnapshots = true;
}
void ParsePacketEntities(NetBuffer msg, clSnapshot_t oldframe, clSnapshot_t newframe)
{
newframe.parseEntitiesNum = cl.parseEntitiesNum;
newframe.numEntities = 0;
// delta from the entities present in oldframe
int oldindex = 0, oldnum = 0;
Common.entityState_t oldstate = null;
if (oldframe == null)
oldnum = 99999;
else
{
if (oldnum >= oldframe.numEntities)
oldnum = 99999;
else
{
oldstate = cl.parseEntities[(oldframe.parseEntitiesNum + oldindex) & 2047];
oldnum = oldstate.number;
}
}
while (true)
{
// read the entity index number
int newnum = msg.ReadInt32();
if (newnum == 1023)
break;
while (oldnum < newnum)
{
// one or more entities from the old packet are unchanged
DeltaEntity(msg, newframe, oldnum, oldstate, true);
oldindex++;
if (oldindex >= oldframe.numEntities)
oldnum = 99999;
else
{
oldstate = cl.parseEntities[(oldframe.parseEntitiesNum + oldindex) & 2047];
oldnum = oldstate.number;
}
}
if (oldnum == newnum)
{
// delta from previous state
DeltaEntity(msg, newframe, newnum, oldstate, false);
oldindex++;
if (oldindex >= oldframe.numEntities)
oldnum = 99999;
else
{
oldstate = cl.parseEntities[(oldframe.parseEntitiesNum + oldindex) & 2047];
oldnum = oldstate.number;
}
continue;
}
if (oldnum > newnum)
{
// delta from baseline
DeltaEntity(msg, newframe, newnum, cl.entityBaselines[newnum], false);
continue;
}
}
// any remaining entities in the old frame are copied over
while (oldnum != 99999)
{
// one or more entities from the old packet are unchanged
DeltaEntity(msg, newframe, oldnum, oldstate, true);
oldindex++;
if (oldindex >= oldframe.numEntities)
oldnum = 99999;
else
{
oldstate = cl.parseEntities[(oldframe.parseEntitiesNum + oldindex) & 2047];
oldnum = oldstate.number;
}
}
}