LumenMeshCards.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "TextureLayout3d.h"
#include "RenderResource.h"
#include "MeshCardRepresentation.h"
#include "LumenSparseSpanArray.h"
 
class FLumenCard;
class FLumenPrimitiveGroup;
class FPrimitiveSceneInfo;
struct FLumenSceneFrameTemporaries;
class FRDGBuilder;
class FRDGScatterUploadBuilder;
class FSceneViewFamily;
class FScene;
class FMeshCardsBuildData;
 
namespace Lumen
{
    constexpr uint32 NumAxisAlignedDirections = 6;
 
    void UpdateCardSceneBuffer(FRDGBuilder& GraphBuilder, FRDGScatterUploadBuilder& UploadBuilder, FLumenSceneFrameTemporaries& FrameTemporaries, const FSceneViewFamily& ViewFamily, FScene* Scene);
};
 
 
class FLumenMeshCards
{
public:
    void Initialize(
        const FMatrix& InLocalToWorld,
        int32 InPrimitiveGroupIndex,
        uint32 InFirstCardIndex,
        uint32 InNumCards,
        const FMeshCardsBuildData& MeshCardsBuildData,
        const FLumenPrimitiveGroup& PrimitiveGroup);
 
    void UpdateLookup(const TSparseSpanArray<FLumenCard>& Cards);
 
    void SetTransform(const FMatrix& InLocalToWorld);
 
    FBox GetWorldSpaceBounds() const
    {
        const FBox WorldSpaceBounds = LocalBounds.TransformBy(LocalToWorld);
        return WorldSpaceBounds;
    }
 
    FMatrix LocalToWorld = FMatrix::Identity;
    FVector3f LocalToWorldScale = FVector3f(1.0f, 1.0f, 1.0f);
    FMatrix WorldToLocalRotation = FMatrix::Identity;
    FBox LocalBounds = FBox(FVector(-1.0f), FVector(-1.0f));
 
    int32 PrimitiveGroupIndex = -1;
    bool bFarField = false;
    bool bHeightfield = false;
    bool bMostlyTwoSided = false;
    bool bEmissiveLightSource = false;
 
    uint32 FirstCardIndex = 0;
    uint32 NumCards = 0;
    uint32 CardLookup[Lumen::NumAxisAlignedDirections];
 
    TArray<int32, TInlineAllocator<1>> ScenePrimitiveIndices;
};
 
namespace LumenMeshCards
{
    float GetCardMinSurfaceArea(bool bEmissiveLightSource);
};