MaterialExpressionFunctionOutput.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 "MaterialExpressionFunctionOutput.generated.h"
 
struct FPropertyChangedEvent;
 
UCLASS(hidecategories=object, MinimalAPI)
class UMaterialExpressionFunctionOutput : public UMaterialExpression
{
    GENERATED_UCLASS_BODY()
 
    
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = MaterialExpressionFunctionOutput)
    FName OutputName;
 
    UPROPERTY(EditAnywhere, Category=MaterialExpressionFunctionOutput, meta=(MultiLine=true))
    FString Description;
 
    UPROPERTY(EditAnywhere, Category=MaterialExpression)
    int32 SortPriority;
 
    UPROPERTY()
    FExpressionInput A;
 
    UPROPERTY()
    uint32 bLastPreviewed:1;
 
    UPROPERTY()
    FGuid Id;
 
 
    //~ Begin UObject Interface.
    virtual void PostLoad() override;
    virtual void PostDuplicate(bool bDuplicateForPIE) override;
#if WITH_EDITOR
    virtual void PostEditImport() override;
    virtual void PreEditChange(FProperty* PropertyAboutToChange) override;
    virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
#endif // WITH_EDITOR
    //~ 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 int32 CompilePreview(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
    virtual void GetCaption(TArray<FString>& OutCaptions) const override;
    virtual FName GetInputName(int32 InputIndex) const override
    {
        return NAME_None;
    }
    virtual void GetExpressionToolTip(TArray<FString>& OutToolTip) override;
    virtual EMaterialValueType GetInputValueType(int32 InputIndex) override;
    virtual EMaterialValueType GetOutputValueType(int32 OutputIndex) override;
    virtual bool IsResultMaterialAttributes(int32 OutputIndex) override;
    virtual bool IsResultSubstrateMaterial(int32 OutputIndex) override;
    virtual void GatherSubstrateMaterialInfo(FSubstrateMaterialInfo& SubstrateMaterialInfo, int32 OutputIndex) override;
    virtual FSubstrateOperator* SubstrateGenerateMaterialTopologyTree(class FMaterialCompiler* Compiler, class UMaterialExpression* Parent, int32 OutputIndex) override;
#endif // WITH_EDITOR
    virtual bool IsAllowedIn(const UObject* MaterialOrFunction) const override;
    //~ End UMaterialExpression Interface
 
 
    ENGINE_API void ConditionallyGenerateId(bool bForce);
 
#if WITH_EDITOR
    ENGINE_API void ValidateName();
#endif // WITH_EDITOR
 
private:
#if WITH_EDITOR
    FName OutputNameBackup;
#endif // WITH_EDITOR
};