自定义UObject进行Replicate

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UE本身有一套自创的网络框架, 在这个框架里UObject类型默认是无法进行属性同步的. 如果想要UObject进行属性同步就必须进行一系列重写.

示例代码

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// .h
UCLASS(BlueprintType, Blueprintable)
class UMyTestObject : public UObject
{
    GENERATED_BODY()
public:
    UMyTestObject(const FObjectInitializer& ObjectInitializer = FObjectInitializer::Get());

public:
    // Allows the Object to get a valid UWorld from it's outer.
    virtual UWorld* GetWorld() const override;

    // allow replicate data
    virtual bool IsSupportedForNetworking() const override;
    virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;

    // allow rpc
    int32 GetFunctionCallspace(UFunction* Function, FFrame* Stack);
    bool CallRemoteFunction(UFunction* Function, void* Parameters, struct FOutParmRec* OutParams, FFrame* Stack);

public:
    UPROPERTY(Replicated)
    uint32 bReplicatedFlag : 1;
};


// .cpp
UMyTestObject::UMyTestObject(const FObjectInitializer& ObjectInitializer /*= FObjectInitializer::Get()*/)
    :UObject(ObjectInitializer)
{

}

UWorld* UMyTestObject::GetWorld() const
{
    if (const UObject* MyOuter = GetOuter())
    {
        return MyOuter->GetWorld();
    }
    return nullptr;
}

bool UMyTestObject::IsSupportedForNetworking() const
{
    return true;
}

void UMyTestObject::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);
    DOREPLIFETIME(UMyTestObject, bReplicatedFlag);
}

bool UMyTestObject::CallRemoteFunction(UFunction* Function, void* Parameters, struct FOutParmRec* OutParams, FFrame* Stack)
{
    if (AActor* OuterActor = Cast<AActor>(GetOuter()))
    {
        UNetDriver* NetDriver = OuterActor->GetNetDriver();
        if (NetDriver)
        {
            NetDriver->ProcessRemoteFunction(OuterActor, Function, Parameters, OutParams, Stack, this);
            return true;
        }
    }
    return false;
}

int32 UMyTestObject::GetFunctionCallspace(UFunction* Function, FFrame* Stack)
{
    if (AActor* OuterActor = Cast<AActor>(GetOuter()))
    {
        return OuterActor->GetFunctionCallspace(Function, Stack);
    }

    return FunctionCallspace::Local;
}

在BasePlayerController.h中添加:

由于Replicated, 需要将pTestObj添加到GetLifetimeReplicatedProps中.

重写ABasePlayerController::ReplicateSubobjects函数, 将pTestObj添加到ABasePlayerController列表中.

在BasePlayerController.cpp中动态创建:

经过上述步骤, 可以将自定义UMyTestObject进行属性同步.

UE Replicate流程

UE在进行属性同步时候, 首先进行Actor自身的属性同步, 然后同步SubObject, 最后才同步自定义UObject.

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// 自定义UObject属性同步流程
--UNetDriver.TickFlush()
 |--UNetDriver.ServerReplicateActors()
 | |--UNetDriver.ServerReplicateActors_ProcessPrioritizedActors()
 | | |--UActorChannel.ReplicateActor()
 | | | |--// 同步该Actor自身属性
 | | | |--FObjectReplicator.ReplicateProperties()
 | | | |--AActor.ReplicateSubobjects()
 | | | | |--// 同步Actor中所有需要Replicated的ActorComponent
 | | | | |--UActorComponent.ReplicateSubobjects()
 | | | | |--UActorChannel.ReplicateSubobject()
 | | | | |--// 自定义UObject进行属性同步
 | | | | |--UActorChannel.ReplicateSubobject()

引用:RPC浅析