SkinnedMeshStateStream.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Materials/MaterialRelevance.h"
#include "SkinnedMeshStateStreamHandle.h"
#include "StateStreamDefinitions.h"
#include "TransformStateStreamHandle.h"
#include "SkinnedMeshStateStream.generated.h"
 
class USkinnedAsset;
class UMaterialInterface;
 
// Skinned state for mesh instance. Can only be set upon creation
 
USTRUCT(StateStreamStaticState)
struct FSkinnedMeshStaticState
{
    GENERATED_USTRUCT_BODY()
 
    UPROPERTY()
    uint64 MaterialRelevance = 0;
};
 
 
// Dynamic state for mesh instance. Can be updated inside ticks
 
USTRUCT(StateStreamDynamicState)
struct FSkinnedMeshDynamicState
{
    GENERATED_USTRUCT_BODY()
 
private: // Use accessors (SetX/GetX) instead of properties directly
 
    UPROPERTY()
    FTransformHandle Transform;
 
    UPROPERTY()
    TObjectPtr<USkinnedAsset> SkinnedAsset;
 
    UPROPERTY()
    TArray<TObjectPtr<UMaterialInterface>> OverrideMaterials;
};
 
 
// Mesh state stream id used for registering dependencies and find statestream
 
inline constexpr uint32 SkinnedMeshStateStreamId = 3;
 
 
// Interface for creating mesh instances
 
class ISkinnedMeshStateStream
{
public:
    DECLARE_STATESTREAM(SkinnedMesh)
    virtual FSkinnedMeshHandle Game_CreateInstance(const FSkinnedMeshStaticState& Ss, const FSkinnedMeshDynamicState& Ds) = 0;
};