MaterialExpressionVertexInterpolator.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "MaterialValueType.h"
#include "Materials/MaterialExpressionCustomOutput.h"
#include "MaterialExpressionVertexInterpolator.generated.h"
 
UCLASS(MinimalAPI)
class UMaterialExpressionVertexInterpolator : public UMaterialExpressionCustomOutput
{
    GENERATED_UCLASS_BODY()
 
    UPROPERTY(meta = (RequiredInput = "true"))
    FExpressionInput Input;
 
#if WITH_EDITOR
    virtual int32 Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) override;
    ENGINE_API int32 CompileInput(class FMaterialCompiler* Compiler, int32 AssignedInterpolatorIndex);
    virtual void GetCaption(TArray<FString>& OutCaptions) const override;
    virtual EMaterialValueType GetInputValueType(int32 InputIndex) override;
    virtual EMaterialValueType GetOutputValueType(int32 OutputIndex) override;
    virtual bool HasCustomSourceOutput() override { return true; }
 
    virtual FExpressionInput* GetInput(int32 InputIndex) override;
    virtual FName GetInputName(int32 InputIndex) const override { return TEXT("VS"); }
 
#endif
 
    virtual FString GetFunctionName() const override { return TEXT("VertexInterpolator"); }
 
    int32               InterpolatorIndex;
    EMaterialValueType  InterpolatedType;
    int32               InterpolatorOffset;
 
#if WITH_EDITOR
    // Errors encountered during pre-translation to be appended if the interpolator is actually in-use
    TArray<TObjectPtr<UMaterialExpression>> CompileErrorExpressions;
    TArray<FString> CompileErrors;  
#endif
};