Pawn,Controller和PawnMovementComponent Tick顺序

发表于 更新于 分类于 ， 阅读次数： 本文字数： 220 阅读时长 ≈ 1 分钟

执行顺序:

注意, UMovementComponent.bTickBeforeOwner默认为true.

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void AController::AddPawnTickDependency(APawn* NewPawn)
{
    if (NewPawn != NULL)
    {
        bool bNeedsPawnPrereq = true;
        UPawnMovementComponent* PawnMovement = NewPawn->GetMovementComponent();
        if (PawnMovement && PawnMovement->PrimaryComponentTick.bCanEverTick)
        {
            PawnMovement->PrimaryComponentTick.AddPrerequisite(this, this->PrimaryActorTick);

            // Don't need a prereq on the pawn if the movement component already sets up a prereq.
            if (PawnMovement->bTickBeforeOwner || NewPawn->PrimaryActorTick.GetPrerequisites().Contains(FTickPrerequisite(PawnMovement, PawnMovement->PrimaryComponentTick)))
            {
                bNeedsPawnPrereq = false;
            }
        }
        
        if (bNeedsPawnPrereq)
        {
            NewPawn->PrimaryActorTick.AddPrerequisite(this, this->PrimaryActorTick);
        }
    }
}

void UMovementComponent::RegisterComponentTickFunctions(bool bRegister)
{
    Super::RegisterComponentTickFunctions(bRegister);

    // Super may start up the tick function when we don't want to.
    UpdateTickRegistration();

    // If the owner ticks, make sure we tick first
    AActor* Owner = GetOwner();
    if (bTickBeforeOwner && bRegister && PrimaryComponentTick.bCanEverTick && Owner && Owner->CanEverTick())
    {
        Owner->PrimaryActorTick.AddPrerequisite(this, PrimaryComponentTick);
    }
}

从代码上可以看出, Controller Tick始终排在PawnTick和PawnMovementTick之前. 如果UMovementComponent.bTickBeforeOwner为true, 则先执行PawnMovementTick再执行PawnTick, 否则PawnTick先执行, PawnMovementTick后执行.

Actor和Component的Tick注册顺序. 当UMovementComponent.bTickBeforeOwner为false时, PawnTick先执行, PawnMovementTick后执行.

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// Pawn,Controller和PawnMovementComponent Tick顺序
--AActor.BeginPlay
|--// 注册Actor自身tick
|--AActor.RegisterAllActorTickFunctions()
| |--AActor.RegisterActorTickFunctions()
| | |--PrimaryActorTick.SetTickFunctionEnable()
| | |--PrimaryActorTick.RegisterTickFunction()
|--// 针对所有Components, 都执行RegisterTick
|--UActorComponent.RegisterAllComponentTickFunctions()
| |--UCharacterMovementComponent.RegisterComponentTickFunctions()
| | |--UMovementComponent.RegisterComponentTickFunctions()
| | | |--UActorComponent.RegisterComponentTickFunctions()
| | | | |--UActorComponent.SetupActorComponentTickFunction()
| | | | | |--TickFunction->SetTickFunctionEnable()
| | | | | |--TickFunction->RegisterTickFunction()
| |--Component->BeginPlay();