MaterialParameterCollectionHLODModifier.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "WorldPartition/HLOD/HLODModifier.h"
#include "WorldPartition/HLOD/HLODBuilder.h"
#include "Materials/MaterialParameterCollectionInstance.h"
#include "MaterialParameterCollectionHLODModifier.generated.h"
 
class UMaterialParameterCollection;
 
USTRUCT()
struct FHLODModifierScalarParameter
{
    GENERATED_USTRUCT_BODY()
 
    FHLODModifierScalarParameter()
    : OverrideValue(0.0f)
    {
        ParameterName = FName(TEXT("Scalar"));
    }
 
    UPROPERTY(EditAnywhere, Category=Parameter)
    FName ParameterName;
 
    UPROPERTY(EditAnywhere, Category=Parameter)
    float OverrideValue;
};
 
 
UCLASS(BlueprintType, Blueprintable)
class UMaterialParameterCollectionHLODModifier : public UWorldPartitionHLODModifier
{
    GENERATED_UCLASS_BODY()
 
    virtual bool CanModifyHLOD(TSubclassOf<UHLODBuilder> InHLODBuilderClass) const;
    virtual void BeginHLODBuild(const FHLODBuildContext& InHLODBuildContext);
    virtual void EndHLODBuild(TArray<UActorComponent*>& InOutComponents);
 
 
    UPROPERTY(EditAnywhere, Category=Material, DisplayName="Material Parameter Collection")
    TObjectPtr<UMaterialParameterCollection> MPC;
 
    UPROPERTY(EditAnywhere, Category=Material, Meta = (TitleProperty = "ParameterName"))
    TArray<FHLODModifierScalarParameter> ScalarParameters;
 
private:
    void ApplyScalarParameterOverrides(UMaterialParameterCollectionInstance* Instance);
    void RestoreScalarParameterValues(UMaterialParameterCollectionInstance* Instance);
 
    const FHLODBuildContext* HLODBuildContext;
    TArray<float> CachedScalarParameterValues;
};