MaterialExpressionTextureObjectFromCollection.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Engine/TextureCollection.h"
#include "Materials/MaterialExpression.h"
#include "MaterialValueType.h"
#include "MaterialExpressionTextureObjectFromCollection.generated.h"
 
UENUM(BlueprintType)
enum class ETextureCollectionMemberType : uint8
{
    Texture2D        UMETA(DisplayName = "Texture 2D"),
    TextureCube      UMETA(DisplayName = "Texture Cube"),
    Texture2DArray   UMETA(DisplayName = "Texture 2D Array"),
    TextureCubeArray UMETA(DisplayName = "Texture Cube Array"),
    TextureVolume    UMETA(DisplayName = "Volume Texture"),
 
    Max
};
 
inline EMaterialValueType MaterialValueTypeFromTextureCollectionMemberType(ETextureCollectionMemberType InType)
{
    switch (InType)
    {
    case ETextureCollectionMemberType::Texture2D:        return MCT_Texture2D;
    case ETextureCollectionMemberType::TextureCube:      return MCT_TextureCube;
    case ETextureCollectionMemberType::Texture2DArray:   return MCT_Texture2DArray;
    case ETextureCollectionMemberType::TextureCubeArray: return MCT_TextureCubeArray;
    case ETextureCollectionMemberType::TextureVolume:    return MCT_VolumeTexture;
    }
    return MCT_Texture2D;
}
 
UCLASS(MinimalAPI)
class UMaterialExpressionTextureObjectFromCollection : public UMaterialExpression
{
    GENERATED_BODY()
 
public:
 
    UPROPERTY(meta = (RequiredInput = "false"))
    FExpressionInput TextureCollection;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=TextureCollection)
    TObjectPtr<UTextureCollection> TextureCollectionObject;
 
    UPROPERTY(meta = (RequiredInput = "false"))
    FExpressionInput CollectionIndex;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=TextureCollection, meta = (OverridingInputProperty = "CollectionIndex"))
    int32 ConstCollectionIndex = 0;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=TextureCollection)
    ETextureCollectionMemberType TextureType = ETextureCollectionMemberType::Texture2D;
 
    //~ Begin UMaterialExpression Interface
#if WITH_EDITOR
    virtual int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
    virtual EMaterialValueType GetInputValueType(int32 InputIndex) override;
    virtual EMaterialValueType GetOutputValueType(int32 OutputIndex) override;
    virtual void GetCaption(TArray<FString>& OutCaptions) const override;
 
    virtual UTextureCollection* GetReferencedTextureCollection() const { return TextureCollectionObject; }
#endif
    //~ End UMaterialExpression Interface
};