MaterialExpressionSetMaterialAttributes.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "Misc/Guid.h"
#include "MaterialExpressionIO.h"
#include "Materials/MaterialExpression.h"
#include "MaterialExpressionSetMaterialAttributes.generated.h"
 
struct FPropertyChangedEvent;
 
UCLASS(collapsecategories, hidecategories = Object, MinimalAPI)
class UMaterialExpressionSetMaterialAttributes : public UMaterialExpression
{
    GENERATED_UCLASS_BODY()
 
    UPROPERTY()
    TArray<FExpressionInput> Inputs;
 
    UPROPERTY(EditAnywhere, Category=MaterialAttributes)
    TArray<FGuid> AttributeSetTypes;
#if WITH_EDITOR
    TArray<FGuid> PreEditAttributeSetTypes;
#endif
 
    //~ Begin UObject Interface
#if WITH_EDITOR
    virtual void PreEditChange(FProperty* PropertyAboutToChange) override;
    virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
#endif
    //~ End UObject Interface
 
    //~ Begin UMaterialExpression Interface
#if WITH_EDITOR
    virtual void Build(MIR::FEmitter& Emitter) override;
    virtual int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
    virtual void GetCaption(TArray<FString>& OutCaptions) const override;
    virtual TArrayView<FExpressionInput*> GetInputsView()override;
    virtual FExpressionInput* GetInput(int32 InputIndex)override;
    virtual FName GetInputName(int32 InputIndex) const override;
    virtual EMaterialValueType GetInputValueType(int32 InputIndex) override;
    virtual bool IsInputConnectionRequired(int32 InputIndex) const override {return true;}
    virtual bool IsResultMaterialAttributes(int32 OutputIndex) override {return true;}
 
    ENGINE_API int32 CreateOrGetInputAttribute(EMaterialProperty Attribute);
    ENGINE_API bool ConnectInputAttribute(EMaterialProperty Attribute, UMaterialExpression* Expression, int32 OutputIndex = 0);
    bool GetSubstrateMaterialInputIndex(int32 OutputIndex, int32& InputIndex);
    virtual bool IsResultSubstrateMaterial(int32 OutputIndex) override;
    virtual void GatherSubstrateMaterialInfo(FSubstrateMaterialInfo& SubstrateMaterialInfo, int32 OutputIndex) override;
    virtual FSubstrateOperator* SubstrateGenerateMaterialTopologyTree(FMaterialCompiler* Compiler, UMaterialExpression* Parent, int32 OutputIndex) override;
    virtual void GetExpressionToolTip(TArray<FString>& OutToolTip) override;
 
    uint64 GetConnectedInputs() const;
#endif
    //~ End UMaterialExpression Interface
};