LensDistortion.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "ScreenPass.h"
 
struct FLensDistortionLUT
{
    static constexpr EPixelFormat kFormat = PF_G32R32F;
 
    FRDGTextureRef DistortingDisplacementTexture = nullptr;
 
    FRDGTextureRef UndistortingDisplacementTexture = nullptr;
 
    float ResolutionFraction = 1.0f;
 
    float DistortionOverscan = 1.0f;
 
    FIntPoint DistortionGridDimensions = FIntPoint(32, 20);
    
    bool IsEnabled() const
    {
        return DistortingDisplacementTexture && UndistortingDisplacementTexture;
    }
};
 
struct FPaniniProjectionConfig
{
    FPaniniProjectionConfig() = default;
 
    RENDERER_API static bool IsEnabledByCVars();
 
    RENDERER_API static FPaniniProjectionConfig ReadCVars();
 
    bool IsEnabled() const
    {
        return D > 0.01f;
    }
 
    void Sanitize()
    {
        D = FMath::Max(D, 0.0f);
    }
 
    // 0=none..1=full, must be >= 0.
    float D = 0.0f;
 
    // Panini hard vertical compression lerp (0=no vertical compression, 1=hard compression).
    float S = 0.0f;
 
 
    FLensDistortionLUT GenerateLUTPasses(FRDGBuilder& GraphBuilder, const FViewInfo& View) const;
 
    RENDERER_API FLensDistortionLUT GenerateLUTPassesUnsafe(FRDGBuilder& GraphBuilder, const FSceneView& InView) const;
};
 
namespace LensDistortion
{
    // Possible pass locations of the lens distortion application in post-processing.
    enum class EPassLocation : uint8
    {
        TSR,
        PrimaryUpscale
    };
 
    EPassLocation GetPassLocation(const FViewInfo& InViewInfo);
 
    RENDERER_API EPassLocation GetPassLocationUnsafe(const FSceneView& InView);
 
    RENDERER_API const FLensDistortionLUT& GetLUTUnsafe(const FSceneView& InView);
 
    RENDERER_API void SetLUTUnsafe(FSceneView& InView, const FLensDistortionLUT& DistortionLUT);
 
} // end namespace LensDistortion