InstanceCullingOcclusionQuery.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "RenderGraphFwd.h"
#include "RenderGraphResources.h"
#include "Containers/Array.h"
#include "Containers/ArrayView.h"
 
class FRDGBuilder;
class FGPUScene;
class FViewInfo;
struct IPooledRenderTarget;
struct FGPUSceneInstanceRange;
 
class FInstanceCullingOcclusionQueryRenderer
{
public:
 
    uint32 Render(FRDGBuilder& GraphBuilder, FGPUScene& GPUScene, FViewInfo& View);
 
    void RenderDebug(FRDGBuilder& GraphBuilder, FGPUScene& GPUScene, const FViewInfo& View, const FIntRect& ViewRect, FRDGTextureRef SceneColor, FRDGTextureRef SceneDepth);
 
    void MarkInstancesVisible(FRDGBuilder& GraphBuilder, TConstArrayView<FGPUSceneInstanceRange> Ranges);
 
    void EndFrame(FRDGBuilder& GraphBuilder);
 
    TRefCountPtr<FRDGPooledBuffer> InstanceOcclusionQueryBuffer;
 
    /*
    * Format that should be used to create views for InstanceOcclusionQueryBuffer.
    * May be R8_UINT or R32_UINT, basd on current hardware capability.
    */
    EPixelFormat InstanceOcclusionQueryBufferFormat = PF_Unknown;
 
    /*
    * Returns true if per-instance occlusion queries can be rendered for the view.
    */
    bool IsCompatibleWithView(const FViewInfo& View);
 
private:
 
    uint32 FindOrAddViewSlot(const FViewInfo& View);
 
    FRDGBufferRef CurrentInstanceOcclusionQueryBuffer = {};
 
    static constexpr uint32 MaxViews = 8; // Visibility mask is stored as uint8
    TArray<uint32> CurrentRenderedViewIDs;
 
    uint32 AllocatedNumInstances = 0;
};