TransformStateStreamImpl.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "GenericStateStream.h"
#include "Templates/RefCounting.h"
#include "TransformStateStream.h"
 
#define UE_API STATESTREAM_API
 
// Listener for when transform object gets dirty.
// Inherit FTransformObjectListener and register to FTransformObject
 
class FTransformObjectListener
{
public:
    virtual void OnTransformObjectDirty() = 0;
 
private:
    FTransformObjectListener* Prev = nullptr;
    FTransformObjectListener* Next= nullptr;
    friend class FTransformObject;
};
 
 
// Transform object representing a instantiated transform.
 
class FTransformObject : public TRefCountingMixin<FTransformObject>, public FTransformObjectListener
{
public:
    struct Info
    {
        const FTransform& WorldTransform;
        const TArray<FTransform>& BoneTransforms;
        bool bVisible;
    };
 
    UE_API Info GetInfo();
 
    UE_API void AddListener(FTransformObjectListener* Listener);
    UE_API void RemoveListener(FTransformObjectListener* Listener);
 
private:
    virtual ~FTransformObject();
    void CallListeners();
    virtual void OnTransformObjectDirty() override final;
 
    TRefCountPtr<FTransformObject> Parent;
    FTransformObjectListener* First = 0;
    const FTransformDynamicState* LocalState = nullptr;
    FTransform WorldTransform;
    bool bDirty = true;
    bool bVisible = true;
 
    friend class FTransformStateStreamImpl;
    friend class TRefCountingMixin<FTransformObject>;
};
 
 
 
class FTransformStateStreamImpl : public TStateStream<TStateStreamSettings<ITransformStateStream, FTransformObject>>
{
private:
    void SetParent(FTransformObject* Object, const FTransformDynamicState& Ds);
    UE_API virtual void Render_OnCreate(const FTransformStaticState& Ss, const FTransformDynamicState& Ds, FTransformObject*& UserData, bool IsDestroyedInSameFrame) override;
    UE_API virtual void Render_OnUpdate(const FTransformStaticState& Ss, const FTransformDynamicState& Ds, FTransformObject*& UserData) override;
    UE_API virtual void Render_OnDestroy(const FTransformStaticState& Ss, const FTransformDynamicState& Ds, FTransformObject*& UserData) override;
};
 
 
#undef UE_API