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59 lines
2.4 KiB
C++
59 lines
2.4 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "GeometryCollection/GeometryCollectionExternalRenderInterface.h"
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#include "GeometryCollectionISMPoolRenderer.generated.h"
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class AGeometryCollectionISMPoolActor;
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class UGeometryCollectionISMPoolComponent;
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class UGeometryCollectionComponent;
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class ULevel;
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/** Implementation of a geometry collection custom renderer that pushes AutoInstanceMeshes to an ISMPool. */
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UCLASS()
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class UGeometryCollectionISMPoolRenderer : public UObject, public IGeometryCollectionExternalRenderInterface
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{
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GENERATED_BODY()
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public:
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//~ Begin IGeometryCollectionExternalRenderInterface Interface.
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virtual void OnRegisterGeometryCollection(UGeometryCollectionComponent const& InComponent) override;
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virtual void OnUnregisterGeometryCollection() override;
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virtual void UpdateState(UGeometryCollection const& InGeometryCollection, FTransform const& InComponentTransform, uint32 InStateFlags) override;
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virtual void UpdateRootTransform(UGeometryCollection const& InGeometryCollection, FTransform const& InRootTransform) override;
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virtual void UpdateTransforms(UGeometryCollection const& InGeometryCollection, TArrayView<const FTransform3f> InTransforms) override;
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//~ End IGeometryCollectionExternalRenderInterface Interface.
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/** Description for a group of meshes that are added/updated together. */
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struct FISMPoolGroup
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{
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int32 GroupIndex = INDEX_NONE;
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TArray<int32> MeshIds;
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};
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protected:
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/** Instanced Static Mesh Pool actor that is used to render our meshes. */
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UPROPERTY(Transient)
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TObjectPtr<AGeometryCollectionISMPoolActor> ISMPoolActor;
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/** Cached component transform. */
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FTransform ComponentTransform = FTransform::Identity;
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/** ISM pool groups per rendering element type. */
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FISMPoolGroup MergedMeshGroup;
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FISMPoolGroup InstancesGroup;
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/** level of the owning component of this renderer */
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ULevel* OwningLevel = nullptr;
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private:
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UGeometryCollectionISMPoolComponent* GetOrCreateISMPoolComponent();
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void InitMergedMeshFromGeometryCollection(UGeometryCollection const& InGeometryCollection);
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void InitInstancesFromGeometryCollection(UGeometryCollection const& InGeometryCollection);
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void UpdateMergedMeshTransforms(FTransform const& InBaseTransform);
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void UpdateInstanceTransforms(UGeometryCollection const& InGeometryCollection, FTransform const& InBaseTransform, TArrayView<const FTransform3f> InTransforms);
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void ReleaseGroup(FISMPoolGroup& InOutGroup);
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};
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