MaterialExpressionLandscapePhysicalMaterialOutput.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Materials/MaterialExpressionCustomOutput.h"
#include "MaterialValueType.h"
#include "MaterialExpressionLandscapePhysicalMaterialOutput.generated.h"
 
USTRUCT()
struct FPhysicalMaterialInput
{
    GENERATED_USTRUCT_BODY()
 
    UPROPERTY(EditAnywhere, Category = PhysicalMaterial)
    TObjectPtr<class UPhysicalMaterial> PhysicalMaterial;
 
    UPROPERTY(meta = (RequiredInput = "true"))
    FExpressionInput Input;
 
    FPhysicalMaterialInput()
        : PhysicalMaterial(nullptr)
    {}
};
 
UCLASS(collapsecategories, hidecategories=Object, MinimalAPI)
class UMaterialExpressionLandscapePhysicalMaterialOutput : public UMaterialExpressionCustomOutput
{
    GENERATED_UCLASS_BODY()
 
    // Maximum number of supported grass types on a given landscape material. Whenever adjusting this, make sure to update LandscapeGrassWeight.usf accordingly:
    static constexpr int32 MaxPhysicalMaterials = 16;
 
    UPROPERTY(EditAnywhere, Category = PhysicalMaterial)
    TArray< FPhysicalMaterialInput > Inputs;
 
#if WITH_EDITOR
    //~ Begin UObject Interface
    LANDSCAPE_API virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
    //~ End UObject Interface
 
    //~ Begin UMaterialExpression Interface
    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;
    virtual EMaterialValueType GetInputValueType(int32 InputIndex) override { return MCT_Float; }
    LANDSCAPE_API virtual int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
 
    //~ End UMaterialExpression Interface
#endif
 
    //~ Begin UMaterialExpressionCustomOutput Interface
    virtual int32 GetNumOutputs() const override { return Inputs.Num(); }
    virtual int32 GetMaxOutputs() const { return MaxPhysicalMaterials; };
    virtual FString GetFunctionName() const override { return TEXT("GetPhysicalMaterial"); }
    //~ End UMaterialExpressionCustomOutput Interface
};