LumenSurfaceCacheFeedback.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "RenderGraphResources.h"
#include "RHIGPUReadback.h"
 
class FLumenSceneData;
class FViewInfo;
class FViewFamilyInfo;
 
namespace Lumen
{
    uint32 GetFeedbackBufferTileSize();
    uint32 GetFeedbackBufferTileWrapMask();
}
 
class FLumenSurfaceCacheFeedback : public FRenderResource
{
public:
    FLumenSurfaceCacheFeedback();
    ~FLumenSurfaceCacheFeedback();
 
    class FFeedbackResources
    {
    public:
        FRDGBufferUAV* BufferAllocatorUAV = nullptr;
        FRDGBufferSRV* BufferAllocatorSRV = nullptr;
        FRDGBufferUAV* BufferUAV = nullptr;
        FRDGBufferSRV* BufferSRV = nullptr;
        uint32 BufferSize = 0;
    };
 
    void AllocateFeedbackResources(FRDGBuilder& GraphBuilder, FFeedbackResources& Resouces, const FViewFamilyInfo& ViewFamily) const;
    FRDGBufferUAVRef GetDummyFeedbackAllocatorUAV(FRDGBuilder& GraphBuilder) const;
    FRDGBufferUAVRef GetDummyFeedbackUAV(FRDGBuilder& GraphBuilder) const;
    void SubmitFeedbackBuffer(const FViewInfo& View, FRDGBuilder& GraphBuilder, FLumenSurfaceCacheFeedback::FFeedbackResources& FeedbackResources);
 
    FRHIGPUBufferReadback* GetLatestReadbackBuffer();
    FIntPoint GetFeedbackBufferTileJitter() const;
    uint32 GetFrameIndex() const { return FrameIndex; }
 
    uint64 GetGPUSizeBytes(bool bLogSizes) const;
 
private:
 
    uint32 FrameIndex = 0;
 
    const int32 MaxReadbackBuffers = 4;
    int32 ReadbackBuffersWriteIndex = 0;
    int32 ReadbackBuffersNumPending = 0;
    TArray<FRHIGPUBufferReadback*> ReadbackBuffers;
};