MotionVectorSimulation.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Misc/Optional.h"
#include "Tickable.h"
#include "UObject/UObjectArray.h"
#include "Math/Transform.h"
#include "HAL/IConsoleManager.h"
 
class UObjectBase;
class USceneComponent;
 
class FMotionVectorSimulation : public FTickableGameObject, public FUObjectArray::FUObjectDeleteListener
{
public:
 
    static ENGINE_API FMotionVectorSimulation& Get();
 
 
    static ENGINE_API bool IsEnabled();
 
public:
 
 
    ENGINE_API bool GetPreviousTransform(UObject* Object, FTransform* OutTransform) const;
 
    ENGINE_API TOptional<FTransform> GetPreviousTransform(UObject* Object) const;   
 
    ENGINE_API void SetPreviousTransform(UObject* Object, const FTransform& SimulatedPreviousTransform);
    
    ENGINE_API void ClearPreviousTransform(UObject* Component);
 
    virtual SIZE_T GetAllocatedSize() const override
    {
        return SimulatedTransforms.GetAllocatedSize();
    }
 
private:
 
    //~ FTickableGameObject interface - used for removing transforms that are no longer valid
    virtual bool IsTickable() const { return SimulatedTransforms.Num() > 0; }
    virtual bool IsTickableInEditor() const override { return true; }
    ENGINE_API virtual void Tick( float DeltaTime ) override;
    ENGINE_API virtual TStatId GetStatId() const override;
 
    //~ FUObjectDeleteListener interface - used for removing transforms for components that are no longer valid
    ENGINE_API virtual void NotifyUObjectDeleted(const UObjectBase* Object, int32 Index) override;
    ENGINE_API virtual void OnUObjectArrayShutdown() override;
    
    //~ Private constructor/destructor to prevent non-singleton use
    FMotionVectorSimulation();
    ~FMotionVectorSimulation();
 
    struct FSimulatedTransform
    {
        FTransform Transform;
        uint64 FrameNumber;
    };
    mutable FCriticalSection MapCriticalSection;
    TMap<const UObjectBase *, FSimulatedTransform> SimulatedTransforms;
};