MaterialExpressionMaterialCache.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Misc/Guid.h"
#include "UObject/ObjectMacros.h"
#include "MaterialExpressionIO.h"
#include "MaterialValueType.h"
#include "MaterialExpressionCustomOutput.h"
#include "MaterialCache/MaterialCacheVirtualTextureTag.h"
#include "MaterialExpressionMaterialCache.generated.h"
 
USTRUCT()
struct FMaterialExpressionMaterialCacheAttribute
{
    GENERATED_BODY()
 
    
    UPROPERTY()
    FString Decoration;
 
    UPROPERTY()
    uint64 ValueType = 0;
 
    UPROPERTY()
    FExpressionInput Input;
};
 
UCLASS(collapsecategories, hidecategories = Object, meta = (Private, DisplayName = "MaterialCache"))
class UMaterialExpressionMaterialCache : public UMaterialExpressionCustomOutput
{
    GENERATED_BODY()
 
public:
    UPROPERTY(EditAnywhere, Category=MaterialAttributes)
    bool bIsSample = false;
 
    UPROPERTY(EditAnywhere, Category=MaterialAttributes)
    TObjectPtr<UMaterialCacheVirtualTextureTag> Tag;
 
    UPROPERTY()
    TArray<FMaterialExpressionMaterialCacheAttribute> Attributes;
 
    UPROPERTY(meta = (RequiredInput = "false"))
    FExpressionInput Primitive;
 
    UPROPERTY(meta = (RequiredInput = "false"))
    FExpressionInput UV;
 
    virtual FString GetFunctionName() const override { return TEXT("GetMaterialCache"); }
    virtual FString GetDisplayName() const override { return TEXT("MaterialCache"); }
 
    UMaterialExpressionMaterialCache(const FObjectInitializer& ObjectInitializer);
 
#if WITH_EDITOR
    void ConstructFromTag();
    void ConstructLayout();
    void ConstructOutputs();
    
    virtual int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
    virtual void GetCaption(TArray<FString>& OutCaptions) const override;
    virtual void GetExpressionToolTip(TArray<FString>& OutToolTip) override;
    virtual EShaderFrequency GetShaderFrequency(uint32 OutputIndex) override;
    virtual EMaterialValueType GetInputValueType(int32 InputIndex) override;
    virtual EMaterialValueType GetOutputValueType(int32 OutputIndex) override;
    virtual FExpressionInput* GetInput(int32 InputIndex) override;
    virtual bool IsInputConnectionRequired(int32 InputIndex) const override;
    virtual bool IsResultMaterialAttributes(int32 OutputIndex) override;
    virtual FName GetInputName(int32 InputIndex) const override;
    virtual int32 GetNumOutputs() const override;
    virtual int32 GetMaxOutputs() const override;
    virtual TArray<FExpressionOutput>& GetOutputs() override;
    virtual bool AllowMultipleCustomOutputs() override;
    virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
    virtual void PostLoad() override;
#endif // WITH_EDITOR
 
private:
#if WITH_EDITOR
    FMaterialCacheTagLayout TagLayout;
#endif
};