GeometryCollectionISMPoolRenderer.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "GeometryCollection/GeometryCollectionExternalRenderInterface.h"
 
#include "GeometryCollectionISMPoolRenderer.generated.h"
 
class UGeometryCollectionComponent;
class UISMPoolComponent;
class ULevel;
 
UCLASS()
class UGeometryCollectionISMPoolRenderer : public UObject, public IGeometryCollectionExternalRenderInterface
{
    GENERATED_BODY()
 
    
    UPROPERTY(Transient)
    TObjectPtr<UISMPoolComponent> CachedISMPoolComponent;
 
    UPROPERTY()
    TObjectPtr<UISMPoolComponent> LocalISMPoolComponent;
 
public:
    //~ Begin IGeometryCollectionExternalRenderInterface Interface.
    virtual void OnRegisterGeometryCollection(UGeometryCollectionComponent& InComponent) override;
    virtual void OnUnregisterGeometryCollection() override;
    virtual void UpdateState(UGeometryCollection const& InGeometryCollection, FTransform const& InComponentTransform, uint32 InStateFlags) override;
    virtual void UpdateRootTransform(UGeometryCollection const& InGeometryCollection, FTransform const& InRootTransform) override;
    virtual void UpdateRootTransforms(UGeometryCollection const& InGeometryCollection, FTransform const& InRootTransform, TArrayView<const FTransform3f> InRootLocalTransforms) override;
    virtual void UpdateTransforms(UGeometryCollection const& InGeometryCollection, TArrayView<const FTransform3f> InTransforms) override;
    //~ End IGeometryCollectionExternalRenderInterface Interface.
 
protected:
    struct FISMPoolGroup
    {
        int32 GroupIndex = INDEX_NONE;
        TArray<int32> MeshIds;
    };
 
    FTransform ComponentTransform = FTransform::Identity;
 
    FISMPoolGroup MergedMeshGroup;
    FISMPoolGroup InstancesGroup;
 
    TWeakObjectPtr<ULevel> OwningLevel;
 
    bool bIsRegistered = false;
 
private:
    UISMPoolComponent* GetISMPoolComponent() const;
    UISMPoolComponent* GetOrCreateISMPoolComponent();
    void InitMergedMeshFromGeometryCollection(UGeometryCollection const& InGeometryCollection);
    void InitInstancesFromGeometryCollection(UGeometryCollection const& InGeometryCollection);
    void UpdateMergedMeshTransforms(FTransform const& InBaseTransform, TArrayView<const FTransform3f> InLocalTransforms);
    void UpdateInstanceTransforms(UGeometryCollection const& InGeometryCollection, FTransform const& InBaseTransform, TArrayView<const FTransform3f> InTransforms);
    void ReleaseGroup(FISMPoolGroup& InOutGroup);
};