MaterialExpressionChannelMaskParameter.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "MaterialValueType.h"
#include "Materials/MaterialExpressionChannelMaskParameterColor.h"
#include "Materials/MaterialExpressionVectorParameter.h"
#include "MaterialExpressionChannelMaskParameter.generated.h"
 
UCLASS(collapsecategories, hidecategories=(Object, MaterialExpressionVectorParameter), MinimalAPI)
class UMaterialExpressionChannelMaskParameter : public UMaterialExpressionVectorParameter
{
    GENERATED_UCLASS_BODY()
 
    UPROPERTY(EditAnywhere, Category=MaterialExpressionChannelMaskParameter)
    TEnumAsByte<EChannelMaskParameterColor::Type> MaskChannel = EChannelMaskParameterColor::Red;
 
    UPROPERTY()
    FExpressionInput Input;
 
#if WITH_EDITOR
    virtual bool GetParameterValue(FMaterialParameterMetadata& OutMeta) const override
    {
        if (Super::GetParameterValue(OutMeta))
        {
            OutMeta.bUsedAsChannelMask = true;
            return true;
        }
        return false;
    }
 
    virtual bool SetParameterValue(FName InParameterName, FLinearColor InValue, EMaterialExpressionSetParameterValueFlags Flags) override;
    virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
 
    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 bool IsInputConnectionRequired(int32 InputIndex) const override {return true;}
    virtual EMaterialValueType GetInputValueType(int32 InputIndex) override {return MCT_Float4;}
 
#endif
 
    virtual bool IsUsedAsChannelMask() const override {return true;}
};