Profile渲染阶段时间--stat scenerendering

在RenderCore(.h,.cpp)声明定义profile字段，加入到局部函数，可以通过stat scenerendering指令来打印出相应时间

Profile CPU执行事件

stat相关声明

声明stat Group

DECLARE_STATS_GROUP(TEXT("TestTime"), STATGROUP_TestTime, STATCAT_Advanced);

声明stat Group下的具体标记

DECLARE_STATS_GROUP(TEXT("TestTime"), STATGROUP_TestTime, STATCAT_Advanced);
DECLARE_CYCLE_STAT(TEXT("TestMyActorTick"), STAT_TestMyActorTick, STATGROUP_TestTime);
DECLARE_CYCLE_STAT(TEXT("TestMyActorCal"), STAT_TestMyActorCal, STATGROUP_TestTime);
DECLARE_CYCLE_STAT(TEXT("TestMyActorCount"), STAT_TestMyActorCount, STATGROUP_TestTime);

SCOPE_CYCLE_COUNTER给一段程序打上标记，从标记到从该段程序退出的时间则为这个标记执行的事件

stat使用例子

来一个例子，下面的actor tick做了两次累加函数，用三个标记分别标记Tick, Test, Test1三个函数。

DECLARE_STATS_GROUP(TEXT("TestTime"), STATGROUP_TestTime, STATCAT_Advanced);
DECLARE_CYCLE_STAT(TEXT("TestMyActorTick"), STAT_TestMyActorTick, STATGROUP_TestTime);
DECLARE_CYCLE_STAT(TEXT("TestMyActorCal"), STAT_TestMyActorCal, STATGROUP_TestTime);
DECLARE_CYCLE_STAT(TEXT("TestMyActorCount"), STAT_TestMyActorCount, STATGROUP_TestTime);

UCLASS()
class TESTHOUDINIPROJECT_API AMyActor : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	AMyActor();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;


	UPROPERTY(EditAnywhere)
		int32 Count1;

	UPROPERTY(EditAnywhere)
		int32 Count2;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

private:
	void Test(int32 Count);
	void Test1(int32 Count);

};

void AMyActor::Tick(float DeltaTime)
{
	SCOPE_CYCLE_COUNTER(STAT_TestMyActorTick);
	Super::Tick(DeltaTime);
	Test(Count1);
	Test1(Count2);

}

void AMyActor::Test(int32 Count)
{
	SCOPE_CYCLE_COUNTER(STAT_TestMyActorCal);

	int64 Total = 0;

	for (int32 Index = 0; Index < Count; ++Index)
	{
		Total += 1;
	}

}

void AMyActor::Test1(int32 Count)
{
	SCOPE_CYCLE_COUNTER(STAT_TestMyActorCount);

	int64 Total = 0;

	for (int32 Index = 0; Index < Count; ++Index)
	{
		Total += 1;
	}
}