SceneVisibility.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "SceneRendererInterface.h"
#include "StaticMeshBatch.h"
#include "MeshPassProcessor.h"
#include "Tasks/Task.h"
 
class FVisibilityTaskData;
class FSceneRenderer;
class FInstanceCullingManager;
class FVirtualTextureUpdater;
 
class FViewCommands
{
public:
    FViewCommands()
    {
        for (int32 PassIndex = 0; PassIndex < EMeshPass::Num; ++PassIndex)
        {
            NumDynamicMeshCommandBuildRequestElements[PassIndex] = 0;
        }
    }
 
    TStaticArray<FMeshCommandOneFrameArray, EMeshPass::Num> MeshCommands;
    TStaticArray<int32, EMeshPass::Num> NumDynamicMeshCommandBuildRequestElements;
    TStaticArray<TArray<const FStaticMeshBatch*, SceneRenderingAllocator>, EMeshPass::Num> DynamicMeshCommandBuildRequests;
    TStaticArray<TArray<EMeshDrawCommandCullingPayloadFlags, SceneRenderingAllocator>, EMeshPass::Num> DynamicMeshCommandBuildFlags;
};
 
class IVisibilityTaskData
{
public:
    virtual ~IVisibilityTaskData() {}
 
    virtual void StartGatherDynamicMeshElements() = 0;
 
    virtual void ProcessRenderThreadTasks() = 0;
 
    virtual void FinishGatherDynamicMeshElements(FExclusiveDepthStencil::Type BasePassDepthStencilAccess, FInstanceCullingManager& InstanceCullingManager, FVirtualTextureUpdater* VirtualTextureUpdater) = 0;
 
    virtual void Finish() = 0;
 
    virtual TArrayView<FViewCommands> GetViewCommandsPerView() = 0;
 
    // Use these tasks as dependencies to trigger tasks at specific stages of the visibility pipeline while initializing.
 
    virtual UE::Tasks::FTask GetFrustumCullTask() const = 0;
 
    virtual UE::Tasks::FTask GetComputeRelevanceTask() const = 0;
 
    virtual UE::Tasks::FTask GetLightVisibilityTask() const = 0;
 
    virtual bool IsTaskWaitingAllowed() const = 0;
 
};
 
extern IVisibilityTaskData* LaunchVisibilityTasks(FRHICommandListImmediate& RHICmdList, FSceneRenderer& SceneRenderer, const UE::Tasks::FTask& BeginInitVisibilityTaskPrerequisites);