MaterialExpressionParameter.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 "Materials/MaterialParameters.h"
#include "Materials/MaterialExpression.h"
#include "MaterialExpressionParameter.generated.h"
 
struct FMaterialParameterInfo;
 
UCLASS(collapsecategories, hidecategories=Object, MinimalAPI)
class UMaterialExpressionParameter : public UMaterialExpression
{
    GENERATED_UCLASS_BODY()
 
    
    UPROPERTY(EditAnywhere, Category=MaterialExpressionParameter)
    FName ParameterName;
 
    UPROPERTY()
    FGuid ExpressionGUID;
 
    UPROPERTY(EditAnywhere, Category=MaterialExpressionParameter)
    FName Group;
 
    UPROPERTY(EditAnywhere, Category=MaterialExpressionParameter)
    int32 SortPriority = 32;
 
    static FName ParameterDefaultName;
 
 
#if WITH_EDITOR
 
    //~ Begin UMaterialExpression Interface
    virtual bool MatchesSearchQuery( const TCHAR* SearchQuery ) override;
    virtual bool CanRenameNode() const override { return true; }
    virtual FString GetEditableName() const override;
    virtual void SetEditableName(const FString& NewName) override;
 
    virtual bool HasAParameterName() const override { return true; }
    virtual FName GetParameterName() const override { return ParameterName; }
    virtual void SetParameterName(const FName& Name) override { ParameterName = Name; }
    virtual void ValidateParameterName(const bool bAllowDuplicateName) override;
 
    virtual bool GetParameterValue(FMaterialParameterMetadata& OutMeta) const override
    {
        OutMeta.Description = Desc;
        OutMeta.ExpressionGuid = ExpressionGUID;
        OutMeta.Group = Group;
        OutMeta.SortPriority = SortPriority;
        OutMeta.AssetPath = GetAssetPathName();
        return true;
    }
 
    virtual void Build(MIR::FEmitter& Emitter) override;
#endif
    virtual bool IsAllowedIn(const UObject* MaterialOrFunction) const
    {
        // UMaterialExpressionParameter is not allowed, but subclasses of UMaterialExpressionParameter are allowed.
        return GetClass() != UMaterialExpressionParameter::StaticClass();
    }
    //~ End UMaterialExpression Interface
 
    virtual FGuid& GetParameterExpressionId() override
    {
        return ExpressionGUID;
    }
};