MaterialExpressionOperator.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 "MaterialExpressionOperator.generated.h"
 
UENUM()
enum class EMaterialExpressionOperatorKind
{
    // Unary
    BitwiseNot,
    Negate,
    Not,
    Abs,
    ACos,
    ACosFast,
    ACosh,
    ASin,
    ASinFast,
    ASinh,
    ATan,
    ATanFast,
    ATanh,
    Ceil,
    Cos,
    Cosh,
    Exponential,
    Exponential2,
    Floor,
    Frac,
    IsFinite,
    IsInf,
    IsNan,
    Length,
    Logarithm,
    Logarithm10,
    Logarithm2,
    LWCTile,
    Reciprocal,
    Round,
    Rsqrt,
    Saturate,
    Sign,
    Sin,
    Sinh,
    Sqrt,
    Tan,
    Tanh,
    Transpose,
    Truncate,
 
    // Binary
    Equals,
    GreaterThan,
    GreaterThanOrEquals,
    LessThan,
    LessThanOrEquals,
    NotEquals,
    And,
    Or,
    Add,
    Subtract,
    Multiply,
    MatrixMultiply,
    Divide,
    Modulo,
    BitwiseAnd,
    BitwiseOr,
    BitShiftLeft,
    BitShiftRight,
    ATan2,
    ATan2Fast,
    Cross,
    Distance,
    Dot,
    Fmod,
    Max,
    Min,
    Pow,
    Step,
 
    // Ternary
    Clamp,
    Lerp,
    Select,
    Smoothstep,
};
 
USTRUCT()
struct FMaterialExpressionOperatorInput
{
    GENERATED_USTRUCT_BODY()
 
    UPROPERTY()
    FExpressionInput ExpressionInput;
 
    UPROPERTY(EditAnywhere, Category = "AddInput")
    float ConstValue;
 
    FMaterialExpressionOperatorInput()
        : ConstValue(1.0f)
    {
    }
};
 
UCLASS(MinimalAPI, meta=(NewMaterialTranslator))
class UMaterialExpressionOperator : public UMaterialExpression
{
    GENERATED_BODY()
 
public:
    UPROPERTY(EditAnywhere, Category = "Dynamic Inputs")
    TArray<FMaterialExpressionOperatorInput> DynamicInputs; 
    
    UPROPERTY(EditAnywhere, Category=MaterialExpressionOperator)
    EMaterialExpressionOperatorKind Operator = EMaterialExpressionOperatorKind::Add;
 
    uint32 Arity = 2;
 
    bool bAllowAddPin = true;
 
    UMaterialExpressionOperator(const FObjectInitializer& ObjectInitializer);
 
    //~ Begin UMaterialExpression Interface
#if WITH_EDITOR
    virtual void AddInputPin(); 
    virtual bool CanDeletePin(EEdGraphPinDirection PinDirection, int32 PinIndex) const override;
    virtual void DeletePin(EEdGraphPinDirection PinDirection, int32 PinIndex) override; 
 
    virtual FExpressionInput* GetInput(int32 InputIndex) override;
    virtual FName GetInputName(int32 InputIndex) const override;
    virtual int32 CountInputs() const override; 
 
    virtual void GetCaption(TArray<FString>& OutCaptions) const override;
    virtual FText GetKeywords() const override;
    virtual FText GetCreationName() const override;
 
    virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
    virtual void PostLoad() override;
 
    virtual void Build(MIR::FEmitter& Emitter) override;
#endif // WITH_EDITOR
    //~ End UMaterialExpression Interface
};