PostProcessUpscale.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "OverridePassSequence.h"
#include "PostProcess/LensDistortion.h"
 
enum class EUpscaleMethod : uint8
{
    None,
    Nearest,
    Bilinear,
    Directional,
    CatmullRom,
    Lanczos,
    Gaussian,
    SmoothStep,
    Area,
    MAX
};
 
EUpscaleMethod GetUpscaleMethod();
 
enum class EUpscaleStage
{
    // Upscaling from the primary to the secondary view rect. The override output cannot be valid when using this stage.
    PrimaryToSecondary,
 
    // Upscaling in one pass to the final target size.
    PrimaryToOutput,
 
    // Upscaling from the secondary view rect to the final view size.
    SecondaryToOutput,
 
    MAX
};
 
class ISpatialUpscaler : public ISceneViewFamilyExtention
{
public:
    struct FInputs
    {
        // [Optional] Render to the specified output. If invalid, a new texture is created and returned.
        FScreenPassRenderTarget OverrideOutput;
 
        // [Required] The input scene color and view rect.
        FScreenPassTexture SceneColor;
 
        // Whether this is a secondary upscale to the final view family target.
        EUpscaleStage Stage = EUpscaleStage::MAX;
    };
 
    virtual const TCHAR* GetDebugName() const = 0;
 
    virtual ISpatialUpscaler* Fork_GameThread(const class FSceneViewFamily& ViewFamily) const = 0;
 
    virtual FScreenPassTexture AddPasses(
        FRDGBuilder& GraphBuilder,
        const FViewInfo& View,
        const FInputs& PassInputs) const = 0;
 
    static RENDERER_API FScreenPassTexture AddDefaultUpscalePass(
        FRDGBuilder& GraphBuilder,
        const FViewInfo& View,
        const FInputs& PassInputs,
        EUpscaleMethod Method,
        FLensDistortionLUT LensDistortionLUT = FLensDistortionLUT());
};