MaterialExpressionLandscapeLayerBlend.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 "MaterialValueType.h"
#include "Materials/MaterialExpression.h"
#include "MaterialExpressionLandscapeLayerBlend.generated.h"
 
class UTexture;
struct FPropertyChangedEvent;
struct FMaterialParameterInfo;
 
UENUM()
enum ELandscapeLayerBlendType : int
{
    LB_WeightBlend,
    LB_AlphaBlend,
    LB_HeightBlend,
};
 
USTRUCT()
struct FLayerBlendInput
{
    GENERATED_USTRUCT_BODY()
 
    UPROPERTY(EditAnywhere, Category=LayerBlendInput)
    FName LayerName;
 
    UPROPERTY(EditAnywhere, Category=LayerBlendInput)
    TEnumAsByte<ELandscapeLayerBlendType> BlendType;
 
    UPROPERTY(meta = (RequiredInput = "false", ToolTip = "Defaults to 'ConstLayerInput' if not specified"))
    FExpressionInput LayerInput;
 
    UPROPERTY(meta = (RequiredInput = "false", ToolTip = "Defaults to 'ConstHeightInput' if not specified"))
    FExpressionInput HeightInput;
 
    UPROPERTY(EditAnywhere, Category=LayerBlendInput)
    float PreviewWeight;
 
    UPROPERTY(EditAnywhere, Category = LayerBlendInput)
    FVector ConstLayerInput;
 
    UPROPERTY(EditAnywhere, Category=LayerBlendInput)
    float ConstHeightInput;
 
    FLayerBlendInput()
        : BlendType(0)
        , PreviewWeight(0.0f)
        , ConstLayerInput(0.0f, 0.0f, 0.0f)
        , ConstHeightInput(0.0f)
    {
    }
};
 
UCLASS(collapsecategories, hidecategories=Object, MinimalAPI)
class UMaterialExpressionLandscapeLayerBlend : public UMaterialExpression
{
    GENERATED_UCLASS_BODY()
 
    UPROPERTY(EditAnywhere, Category=MaterialExpressionLandscapeLayerBlend)
    TArray<FLayerBlendInput> Layers;
 
    //~ Begin UObject Interface
    LANDSCAPE_API virtual void Serialize(FStructuredArchive::FRecord Record) override;
#if WITH_EDITOR
    LANDSCAPE_API virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
    //~ End UObject Interface
 
    //~ Begin UMaterialExpression Interface
    LANDSCAPE_API virtual EMaterialValueType GetInputValueType(int32 InputIndex) override;
    virtual EMaterialValueType GetOutputValueType(int32 InputIndex) override { return MCT_Unknown; }
    LANDSCAPE_API virtual bool IsResultMaterialAttributes(int32 OutputIndex) override;
    LANDSCAPE_API virtual int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
    LANDSCAPE_API virtual void GetCaption(TArray<FString>& OutCaptions) const override;
    LANDSCAPE_API virtual TArrayView<FExpressionInput*> GetInputsView() override;
    LANDSCAPE_API virtual FExpressionInput* GetInput(int32 InputIndex) override;
    LANDSCAPE_API virtual FName GetInputName(int32 InputIndex) const override;
 
 
    LANDSCAPE_API virtual void GetLandscapeLayerNames(TArray<FName>& OutLayers) const override;
#endif
    LANDSCAPE_API virtual UObject* GetReferencedTexture() const override;
    LANDSCAPE_API virtual ReferencedTextureArray GetReferencedTextures() const override;
    virtual bool CanReferenceTexture() const override { return true; }
    //~ End UMaterialExpression Interface
 
private:
    LANDSCAPE_API int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex, bool bForPreview);
};