protected override void OnUpdate()
{
if (connectionGroup.IsEmptyIgnoreFilter)
{
predictTargetTick = 0;
latestSnapshotEstimate = 0;
return;
}
var tickRate = default(ClientServerTickRate);
if (HasSingleton <ClientServerTickRate>())
{
tickRate = GetSingleton <ClientServerTickRate>();
}
tickRate.ResolveDefaults();
var ack = GetSingleton <NetworkSnapshotAckComponent>();
// FIXME: 根据延迟进行调整
uint interpolationTimeMS = KInterpolationTimeMS;
if (interpolationTimeMS == 0)
{
// 2000 + 19 / 20 = 100.95ms = 100ms
interpolationTimeMS = (1000 * KInterpolationTimeMS + (uint)tickRate.NetworkTickRate - 1) /
(uint)tickRate.NetworkTickRate;
}
// 估计往返时间
float estimatedRTT = ack.EstimatedRTT;
// 固定+2.5f
float interpolationFrames = 0.5f + kTargetCommandSlack +
((estimatedRTT + 4 * ack.DeviationRTT + interpolationTimeMS) / 1000f) *
tickRate.SimulationTickRate;
if (latestSnapshotEstimate == 0)
{
if (ack.LastReceivedSnapshotByLocal == 0)
{
predictTargetTick = 0;
return;
}
latestSnapshotEstimate = ack.LastReceivedSnapshotByLocal;
// 估算出服务端tick
predictTargetTick = GetCurrentPredictTick(estimatedRTT, tickRate.SimulationTickRate);
currentInterpolationFrames = interpolationFrames;
for (int i = 0; i < commandAgeAdjustment.Length; ++i)
{
commandAgeAdjustment[i] = 0;
}
}
else
{
latestSnapshotEstimate = ack.LastReceivedSnapshotByLocal;
}
int curSlot = (int)(ack.LastReceivedSnapshotByLocal % commandAgeAdjustment.Length);
// 当来一个新的数据时，清除前面的数据.
if (curSlot != commandAgeAdjustmentSlot)
{
for (int i = (commandAgeAdjustmentSlot + 1) % commandAgeAdjustment.Length;
i != (curSlot + 1) % commandAgeAdjustment.Length;
i = (i + 1) % commandAgeAdjustment.Length)
{
commandAgeAdjustment[i] = 0;
}
commandAgeAdjustmentSlot = curSlot;
}
// 服务器输入buffer的数量 负数:没被消耗的数量 正数:服务端不够的数量
float commandAge = ack.ServerCommandAge / 256f + kTargetCommandSlack;
// 估算rtt有多少个tick
int rttInTicks = (int)((uint)estimatedRTT * (uint)tickRate.SimulationTickRate / 1000);
if (rttInTicks > commandAgeAdjustment.Length)
{
rttInTicks = commandAgeAdjustment.Length;
}
// 因为commandAge是在服务器上计算并发送到客户端的，所以我们必须等待一个完整的RTT进行调整，直到在客户端上看到对commandAge的任何更新。
// 为了弥补这一点，我们跟踪了在一个完整的RTT（即commandAgeAdjustment循环缓冲区）期间尝试调整commandAge的量的近似值。
// 记录了在一个完整RTT中客户端自己调整commandAge的值
// 每次Update时为了从最后一次收到的commandAge(每次计算都是从最后一次收到服务端的age计算的)值中,还原客户端自己最新调整的值(为了接着上次自己调整的值继续调整)。
for (int i = 0; i < rttInTicks; ++i)
{
commandAge -=
commandAgeAdjustment[
(commandAgeAdjustment.Length + commandAgeAdjustmentSlot - i) % commandAgeAdjustment.Length];
}
// 有多少个tick 1s/50tick
float deltaTicks = Time.DeltaTime * tickRate.SimulationTickRate;
float predictionTimeScale = 1.0f;
// 小于10个tick,就进行微调。
if (math.abs(commandAge) < 10)
{
predictionTimeScale = math.clamp(1.0f + 0.1f * commandAge, 0.9f, 1.1f);
subPredictTargetTick += deltaTicks * predictionTimeScale;
uint pdiff = (uint)subPredictTargetTick;
subPredictTargetTick -= pdiff;
predictTargetTick += pdiff;
}
else // 大于10个刻度，重新预测.直接追上最新预测.
{
uint curPredict = GetCurrentPredictTick(estimatedRTT, tickRate.SimulationTickRate);
for (int i = 0; i < commandAgeAdjustment.Length; ++i)
{
commandAgeAdjustment[i] = 0;
}
subPredictTargetTick = 0;
predictTargetTick = curPredict;
return;
}
// 记录客户端自己对commandAge进行调整的值(在一个完整RTT期间中，客户端都是自己在尝试对commandAge进行调整.)
// 以便在下一个commandAge没到之前，自行对commandAge尝试调整(每次Update调用都会进行调整,所有记录了一个完整RTT期间尝试的调整值).
commandAgeAdjustment[commandAgeAdjustmentSlot] += deltaTicks * (predictionTimeScale - 1.0f);
#if UNITY_EDITOR || DEVELOPMENT_BUILD
NetDebug.Set(nameof(commandAge), commandAge);
NetDebug.Set(nameof(predictionTimeScale), predictionTimeScale);
NetDebug.Set(nameof(predictTargetTick), predictTargetTick);
#endif
// currentInterpolationFrames +=
// math.clamp((interpolationFrames - currentInterpolationFrames * 0.1f), -0.1f, 0.1f);
//
// var idiff = (uint) currentInterpolationFrames;
// interpolateTargetTick = predictTargetTick - idiff;
// var subidiff = currentInterpolationFrames - idiff;
// subidiff -= subInterpolateTargetTick + subPredictTargetTick;
// if (subidiff < 0)
// {
// ++interpolateTargetTick;
// subidiff = -subidiff;
// }
// else if (subidiff > 0)
// {
// idiff = (uint) subidiff;
// subidiff -= idiff;
// interpolateTargetTick -= idiff;
// subidiff = 1f - subidiff;
// }
//
// subInterpolateTargetTick = subidiff;
_renderTime.TickRate = tickRate;
_renderTime.UpdateTime(ack.LastReceivedSnapshotByLocal, Time.DeltaTime);
interpolateTargetTick = _renderTime.InterpolateTargetTick;
subInterpolateTargetTick = _renderTime.InterpolateFaction;
NetDebug.RenderTick = interpolateTargetTick;
NetDebug.Set("lastRecvSnapDiff",
$"{_renderTime.Diff}| Error:{_renderTime.Error} Min:{_renderTime.MinError} Max:{_renderTime.MaxError}");
}
protected override unsafe void OnUpdate()
{
var session = GetSingletonEntity <CommandTargetComponent>();
var inBuffer = EntityManager.GetBuffer <IncomingSnapshotDataStreamBufferComponent>(session);
var reader = inBuffer.AsDataStreamReader();
if (reader.Length == 0)
{
return;
}
#if UNITY_EDITOR || DEVELOPMENT_BUILD
NetDebug.SnapMS = reader.Length;
NetDebug.DownCount += reader.Length;
#endif
uint serverTick = reader.ReadUInt();
var ack = EntityManager.GetComponentData <NetworkSnapshotAckComponent>(session);
if (ack.IsOldWithLastReceivedSnapshotByLocal(serverTick))
{
return;
}
ack.UpdateLocalValues(serverTick);
PostUpdateCommands.SetComponent(session, ack);
uint destroyLen = reader.ReadUInt();
uint len = reader.ReadUInt();
for (int i = 0; i < destroyLen; i++)
{
int ghostId = reader.ReadPackedInt(_networkCompressionModel);
if (!_ghostEntityMap.TryGetValue(ghostId, out Entity ent))
{
continue;
}
var s = new GhostDespawnSystem.DelayedDespawnGhost
{
Ghost = new SpawnedGhost
{
GhostId = ghostId,
SpawnTick = EntityManager.GetComponentData <GhostComponent>(ent).SpawnTick
},
Tick = serverTick
};
_ghostEntityMap.Remove(ghostId);
if (EntityManager.HasComponent <GhostPredictionComponent>(ent))
{
_ghostDespawnSystem.AddToPredicted(s);
}
else
{
_ghostDespawnSystem.AddToInterpolated(s);
}
}
var ghostSerializerCollectionSystem = World.GetExistingSystem <GhostCollectionSystem>();
var ghostSpawnEntity = GetSingletonEntity <GhostSpawnQueueComponent>();
var bufferFromEntity = GetBufferFromEntity <SnapshotDataBuffer>();
var spawnBufferFromEntity = GetBufferFromEntity <GhostSpawnBuffer>();
var compFromEntity = GetComponentDataFromEntity <SnapshotData>();
for (int i = 0; i < len; i++)
{
int ghostType = reader.ReadPackedInt(_networkCompressionModel);
int ghostId = reader.ReadPackedInt(_networkCompressionModel);
if (ghostType < 0 || ghostType >= ghostSerializerCollectionSystem.GhostTypeCollection.Length)
{
throw new Exception($"GhostRecvSystem:GhostType={ghostType}, GhostId={ghostId}");
}
// 序列化组件信息
var typeState = ghostSerializerCollectionSystem.GhostTypeCollection[ghostType];
var baseOffset = typeState.FirstComponent;
var numBaseComponents = typeState.NumComponents;
byte *snapshotData;
DynamicBuffer <SnapshotDataBuffer> snapshotDataBuffer;
SnapshotData snapshotDataComponent;
bool existingGhost = _ghostEntityMap.TryGetValue(ghostId, out Entity gent);
if (existingGhost && bufferFromEntity.HasComponent(gent) &&
compFromEntity.HasComponent(gent))
{
snapshotDataBuffer = bufferFromEntity[gent];
snapshotData = (byte *)snapshotDataBuffer.GetUnsafePtr();
snapshotDataComponent = compFromEntity[gent];
snapshotDataComponent.LatestIndex =
(snapshotDataComponent.LatestIndex + 1) % GlobalConstants.SnapshotHistorySize;
compFromEntity[gent] = snapshotDataComponent;
}
else
{
var ghostSpawnBuffer = spawnBufferFromEntity[ghostSpawnEntity];
snapshotDataBuffer = bufferFromEntity[ghostSpawnEntity];
var snapshotDataBufferOffset = snapshotDataBuffer.Length;
ghostSpawnBuffer.Add(new GhostSpawnBuffer
{
GhostType = ghostType,
GhostId = ghostId,
ClientSpawnTick = serverTick,
ServerSpawnTick = serverTick,
DataOffset = snapshotDataBufferOffset
});
snapshotDataBuffer.ResizeUninitialized(snapshotDataBufferOffset + typeState.SnapshotSize);
snapshotData = (byte *)snapshotDataBuffer.GetUnsafePtr() + snapshotDataBufferOffset;
UnsafeUtility.MemClear(snapshotData, typeState.SnapshotSize);
snapshotDataComponent = new SnapshotData
{
SnapshotSize = typeState.SnapshotSize,
LatestIndex = 0
};
}
// 把快照放到对应内存中
snapshotData += typeState.SnapshotSize * snapshotDataComponent.LatestIndex;
*((uint *)snapshotData) = serverTick;
snapshotData += GlobalConstants.TickSize;
// 放到快照对应内存位置
for (int j = 0; j < numBaseComponents; j++)
{
var compIdx = ghostSerializerCollectionSystem.IndexCollection[baseOffset + j].ComponentIndex;
var serializer =
ghostSerializerCollectionSystem.Serializers[compIdx];
serializer.Deserialize.Ptr.Invoke((IntPtr)snapshotData, ref reader, ref _networkCompressionModel);
snapshotData += serializer.DataSize;
}
}
#if UNITY_EDITOR || DEVELOPMENT_BUILD
NetDebug.Set(nameof(ack.LastReceivedSnapshotByLocal), ack.LastReceivedSnapshotByLocal);
NetDebug.Set(nameof(ack.EstimatedRTT), ack.EstimatedRTT);
NetDebug.Set(nameof(ack.DeviationRTT), ack.DeviationRTT);
NetDebug.RTT = (uint)ack.EstimatedRTT;
NetDebug.Jitter = (uint)ack.DeviationRTT;
#endif
inBuffer.Clear();
}