FoveatedImageGenerator.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "RHI.h"
#include "RendererInterface.h"
#include "RenderGraphDefinitions.h"
#include "VariableRateShadingImageManager.h"
#include "Engine/Engine.h"
 
class FFoveatedImageGenerator : public IVariableRateShadingImageGenerator
{
public:
    virtual ~FFoveatedImageGenerator() override {};
    virtual FRDGTextureRef GetImage(FRDGBuilder& GraphBuilder, const FViewInfo& ViewInfo, FVariableRateShadingImageManager::EVRSImageType ImageType, bool bGetSoftwareImage = false) override;
    virtual void PrepareImages(FRDGBuilder& GraphBuilder, const FSceneViewFamily& ViewFamily, const FMinimalSceneTextures& SceneTextures, bool bPrepareHardwareImages, bool bPrepareSoftwareImages) override;
    virtual bool IsEnabled() const override;
    virtual bool IsSupportedByView(const FSceneView& View) const override;
    virtual FVariableRateShadingImageManager::EVRSSourceType GetType() const override;
    virtual FRDGTextureRef GetDebugImage(FRDGBuilder& GraphBuilder, const FViewInfo& ViewInfo, FVariableRateShadingImageManager::EVRSImageType ImageType, bool bGetSoftwareImage = false) override;
private:
    FRDGTextureRef CachedImage = nullptr;
    struct FDynamicVRSData
    {
        float   VRSAmount = 1.0f;
        double  SumBusyTime = 0.0;
        int     NumFramesStored = 0;
        uint32  LastUpdateFrame = 0;
    } DynamicVRSData;
    float UpdateDynamicVRSAmount();
    bool IsGazeTrackingEnabled() const;
};