MaterialExpressionShaderStageSwitch.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 "RHIDefinitions.h"
#include "MaterialExpressionShaderStageSwitch.generated.h"
 
UCLASS(collapsecategories, hidecategories = Object, MinimalAPI)
class UMaterialExpressionShaderStageSwitch : public UMaterialExpression
{
    GENERATED_BODY()
 
public:
 
    static inline bool ShouldUsePixelShaderInput(EShaderFrequency InShaderFrequency)
    {
        // Compute is considered pixel shader here, as the majority of material behavior that depends on pixel shader also allows compute shader
        return (InShaderFrequency == SF_Pixel || InShaderFrequency == SF_Compute);
    }
 
    UPROPERTY(meta = (RequiredInput = "true", ToolTip = "Input will be used in pixel (or compute) shader stages"))
    FExpressionInput PixelShader;
 
    UPROPERTY(meta = (RequiredInput = "true", ToolTip = "Input will be in vertex (or tessellation) shader stages"))
    FExpressionInput VertexShader;
 
    //~ 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 void GetExpressionToolTip(TArray<FString>& OutToolTip) override;
    virtual FText GetKeywords() const override { return FText::FromString(TEXT("vertex pixel shader")); }
 
#endif
    //~ End UMaterialExpression Interface
};