MaterialExpressionBlendMaterialAttributes.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "MaterialExpressionIO.h"
#include "MaterialValueType.h"
#include "Materials/MaterialExpression.h"
#include "MaterialExpressionBlendMaterialAttributes.generated.h"
 
UENUM()
namespace EMaterialAttributeBlend
{
    enum Type : int
    {
        Blend,
        UseA,
        UseB
    };
}
 
UENUM()
namespace EMaterialAttributeBlendFunction
{
    enum Type : int
    {
        Horizontal,
        Vertical
    };
}
 
UCLASS(collapsecategories, hidecategories = Object, MinimalAPI)
class UMaterialExpressionBlendMaterialAttributes : public UMaterialExpression
{
    GENERATED_UCLASS_BODY()
 
    UPROPERTY()
    FMaterialAttributesInput A;
 
    UPROPERTY()
    FMaterialAttributesInput B;
 
    UPROPERTY()
    FExpressionInput Alpha;
 
    // Optionally skip blending attributes of this type.
    UPROPERTY(EditAnywhere, Category=MaterialAttributes)
    TEnumAsByte<EMaterialAttributeBlend::Type> PixelAttributeBlendType = EMaterialAttributeBlend::Blend;
 
    // Optionally skip blending attributes of this type.
    UPROPERTY(EditAnywhere, Category=MaterialAttributes)
    TEnumAsByte<EMaterialAttributeBlend::Type> VertexAttributeBlendType = EMaterialAttributeBlend::Blend;
 
    //~ Begin UMaterialExpression Interface
#if WITH_EDITOR
    virtual void Build(MIR::FEmitter& Emitter) override;
    virtual FExpressionInput* GetInput(int32 InputIndex) override;
    virtual int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
    virtual void GetCaption(TArray<FString>& OutCaptions) const override;
    virtual FName GetInputName(int32 InputIndex) const override;
    virtual bool IsInputConnectionRequired(int32 InputIndex) const override {return true;}
    virtual bool IsResultMaterialAttributes(int32 OutputIndex) override {return true;}
    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;
    virtual EMaterialValueType GetInputValueType(int32 InputIndex) override {return InputIndex == 2 ? MCT_Float1 : MCT_MaterialAttributes;}
#endif
    //~ End UMaterialExpression Interface
};
 
 
UCLASS(collapsecategories, hidecategories = Object, MinimalAPI, meta = (Private))
class UMaterialExpressionLegacyBlendMaterialAttributes : public UMaterialExpressionBlendMaterialAttributes
{
    GENERATED_UCLASS_BODY()
 
public:
 
    UPROPERTY()
    FExpressionInput VertexAttribute_UseA;
 
    UPROPERTY()
    FExpressionInput VertexAttribute_UseB;
 
    UPROPERTY()
    FExpressionInput PixelAttribute_UseA;
 
    UPROPERTY()
    FExpressionInput PixelAttribute_UseB;
 
    UPROPERTY(EditAnywhere, Category = MaterialAttributes)
    TEnumAsByte<EMaterialAttributeBlendFunction::Type> BlendFunctionType;
};