MaterialExpressionCollectionTransform.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 "Materials/MaterialExpression.h"
#include "MaterialExpressionCollectionTransform.generated.h"
 
struct FPropertyChangedEvent;
 
UENUM()
enum class EParameterCollectionTransformType : uint8
{
    Position UMETA(ToolTip = "Float 4x4 matrix (includes translation, 4 input elements, output float3 or float4 depending on input)"),
    Vector UMETA(ToolTip = "Float 3x3 matrix (rotation only, 3 input elements, output float3)"),
    Projection UMETA(ToolTip = "Float 4x4 projection matrix (optimized assuming only m11 m22 m33 m34 m43 m44 non-zero, 4 input elements, output float4)"),
    LocalToWorld UMETA(ToolTip = "LWC matrix (float 4x4, post tile offset, 5 vector elements, output LWC float3)"),
    WorldToLocal UMETA(ToolTip = "LWC inverse matrix (float 4x4, pre tile offset, 5 vector elements, output float3 or float4 depending on input)")
};
 
// Node that uses 3 to 5 consecutive vector elements of a Material Parameter Collection as a Transform matrix
UCLASS(hidecategories = object, MinimalAPI)
class UMaterialExpressionCollectionTransform : public UMaterialExpression
{
    GENERATED_UCLASS_BODY()
 
    UPROPERTY()
    FExpressionInput Input;
 
    UPROPERTY(EditAnywhere, Category=MaterialExpressionCollectionTransform)
    TObjectPtr<class UMaterialParameterCollection> Collection;
 
    UPROPERTY(EditAnywhere, Category=MaterialExpressionCollectionTransform)
    FName ParameterName;
 
    UPROPERTY()
    FGuid ParameterId;
 
    UPROPERTY(EditAnywhere, Category=MaterialExpressionCollectionTransform)
    EParameterCollectionTransformType TransformType;
 
    //~ Begin UObject Interface.
#if WITH_EDITOR
    virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
#endif // WITH_EDITOR
    virtual void PostLoad() override;
    //~ End UObject Interface.
 
    //~ Begin UMaterialExpression Interface
#if WITH_EDITOR
    virtual void Build(MIR::FEmitter& Emitter) override;
    virtual int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
    virtual void GetCaption(TArray<FString>& OutCaptions) const override;
 
    virtual bool HasAParameterName() const override { return true; }
    virtual FName GetParameterName() const override { return ParameterName; }
    virtual void SetParameterName(const FName& Name) override { ParameterName = Name; }
    virtual void ValidateParameterName(const bool bAllowDuplicateName) override {};
 
    virtual bool MatchesSearchQuery( const TCHAR* SearchQuery ) override;
#endif
    //~ End UMaterialExpression Interface
};