MaterialExpressionDesaturation.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 "Materials/MaterialExpression.h"
#include "MaterialExpressionDesaturation.generated.h"
 
UCLASS(MinimalAPI, collapsecategories, hidecategories=Object)
class UMaterialExpressionDesaturation : public UMaterialExpression
{
    GENERATED_UCLASS_BODY()
 
    // Outputs: Lerp(Input,dot(Input,LuminanceFactors)),Fraction)
    UPROPERTY()
    FExpressionInput Input;
 
    UPROPERTY()
    FExpressionInput Fraction;
 
    /* 
     * Luminance factors for converting a color to greyscale.
     * 
     * The default luminance factors values are now derived from the working color space. For uses cases
     * outside scene rendering, users are responsible for updating these factors accordingly. For example,
     * factors derived from an AP1 working color space would not be applicable to UI domain materials that
     * remain in sRGB/Rec.709 and thus should instead use approximately [0.2126, 0.7152, 0.0722].
     */
    UPROPERTY(EditAnywhere, Category=MaterialExpressionDesaturation, Meta = (ShowAsInputPin = "Advanced"))
    FLinearColor LuminanceFactors;
 
 
    //~ 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
    {
        OutCaptions.Add(TEXT("Desaturation"));
    }
#endif
    //~ End UMaterialExpression Interface
};