ISMInstanceUpdateChangeSet.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "InstanceDataSceneProxy.h"
#include "Containers/StridedView.h"
#include "InstanceData/InstanceUpdateChangeSet.h"
 
class FISMInstanceUpdateChangeSet : public FInstanceUpdateChangeSet
{
public:
    // Upcycle constructors
    using FInstanceUpdateChangeSet::FInstanceUpdateChangeSet;
 
    FInstanceAttributeTracker::FDeltaRange<FInstanceAttributeTracker::EFlag::CustomDataChanged> GetCustomDataDelta() const 
    { 
        // Force empty range if no custom data
        return GetDelta<FInstanceAttributeTracker::EFlag::CustomDataChanged>(NumCustomDataFloats == 0 || !Flags.bHasPerInstanceCustomData);
    }
 
    FIdentityDeltaRange GetInstanceLightShadowUVBiasDelta() const
    {
        return FIdentityDeltaRange(InstanceLightShadowUVBias.Num());
    }
 
#if WITH_EDITOR
    FIdentityDeltaRange GetInstanceEditorDataDelta() const
    {
        return FIdentityDeltaRange(InstanceEditorData.Num());
    }
#endif
 
    inline void AddInstanceLightShadowUVBias(const FVector4f &Value)
    {
        InstanceLightShadowUVBias.Emplace(Value); 
    }
 
    ENGINE_API void SetInstanceTransforms(TStridedView<FMatrix> InInstanceTransforms, const FVector Offset);
    ENGINE_API void SetInstanceTransforms(TStridedView<FMatrix> InInstanceTransforms);
 
    ENGINE_API void SetInstanceTransforms(TStridedView<FMatrix> InInstanceTransforms, FBox const& InInstanceBounds, FBox& OutGatheredBounds);
 
    ENGINE_API void SetInstancePrevTransforms(TArrayView<FMatrix> InPrevInstanceTransforms, const FVector &Offset);
    ENGINE_API void SetInstancePrevTransforms(TArrayView<FMatrix> InPrevInstanceTransforms);
    ENGINE_API void SetCustomData(const TArrayView<const float> &InPerInstanceCustomData, int32 InNumCustomDataFloats);
    
    UE_DEPRECATED(5.6, "Use SetSharedLocalBounds instead")
    void SetInstanceLocalBounds(const FRenderBounds &Bounds) { SetSharedLocalBounds(Bounds); }
    TArray<int32> LegacyInstanceReorderTable;
    int32 PostUpdateNumInstances = 0;
};