MovieScenePiecewiseIntegerBlenderSystem.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "EntitySystem/MovieSceneEntitySystem.h"
#include "EntitySystem/MovieSceneBlenderSystem.h"
#include "EntitySystem/MovieSceneDecompositionQuery.h"
#include "EntitySystem/MovieSceneCachedEntityFilterResult.h"
#include "MovieScenePiecewiseIntegerBlenderSystem.generated.h"
 
namespace UE
{
namespace MovieScene
{
 
    struct FIntegerBlendResult
    {
        int64 Total = 0;
        double Weight = 0.f;
    };
 
    struct FIntegerAccumulationBuffers
    {
        bool IsEmpty() const;
 
        void Reset();
 
        TArray<FIntegerBlendResult> Absolute;
        TArray<FIntegerBlendResult> Relative;
        TArray<FIntegerBlendResult> Additive;
        TArray<FIntegerBlendResult> AdditiveFromBase;
    };
 
} // namespace MovieScene
} // namespace UE
 
 
UCLASS(MinimalAPI)
class UMovieScenePiecewiseIntegerBlenderSystem : public UMovieSceneBlenderSystem
{
public:
    GENERATED_BODY()
 
    MOVIESCENETRACKS_API UMovieScenePiecewiseIntegerBlenderSystem(const FObjectInitializer& ObjInit);
 
    using FMovieSceneEntityID  = UE::MovieScene::FMovieSceneEntityID;
    using FComponentTypeID     = UE::MovieScene::FComponentTypeID;
 
    MOVIESCENETRACKS_API virtual void OnLink() override;
    MOVIESCENETRACKS_API virtual void OnSchedulePersistentTasks(UE::MovieScene::IEntitySystemScheduler* TaskScheduler) override;
    MOVIESCENETRACKS_API virtual void OnRun(FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents) override;
 
private:
 
    void ReinitializeAccumulationBuffers();
    void ZeroAccumulationBuffers();
 
private:
 
    UE::MovieScene::FIntegerAccumulationBuffers AccumulationBuffers;
 
    UE::MovieScene::FCachedEntityManagerState ChannelRelevancyCache;
};