LateUpdateManager.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
#include "CoreMinimal.h"
 
class USceneComponent;
class FSceneInterface;
class FPrimitiveSceneInfo;
 
class FLateUpdateManager
{
public:
    FLateUpdateManager() {}
    virtual ~FLateUpdateManager() {}
 
    HEADMOUNTEDDISPLAY_API void Setup(const FTransform& ParentToWorld, USceneComponent* Component, bool bSkipLateUpdate);
 
    bool GetSkipLateUpdate_RenderThread() const { return PipelinedUpdateStatesRendering.bSkip; }
 
    HEADMOUNTEDDISPLAY_API void Apply_RenderThread(FSceneInterface* Scene, const FTransform& OldRelativeTransform, const FTransform& NewRelativeTransform);
 
private:
 
    HEADMOUNTEDDISPLAY_API void GatherLateUpdatePrimitives(USceneComponent* ParentComponent);
    HEADMOUNTEDDISPLAY_API void CacheSceneInfo(USceneComponent* Component);
 
    struct FLateUpdateState
    {
        FLateUpdateState()
            : ParentToWorld(FTransform::Identity)
            , bSkip(false)
        {}
 
        FTransform ParentToWorld;
        TMap<FPrimitiveSceneInfo*, int32> Primitives;
        bool bSkip;
    };
 
    FLateUpdateState PipelinedUpdateStatesGame;
    FLateUpdateState PipelinedUpdateStatesRendering;
};