MovieSceneCameraShakeSystem.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "EntitySystem/MovieSceneEntitySystem.h"
#include "EntitySystem/MovieSceneEntitySystemLinkerExtension.h"
#include "EntitySystem/MovieSceneEntitySystemLinkerSharedExtension.h"
#include "Evaluation/MovieSceneCameraShakePreviewer.h"
#include "Sections/MovieSceneCameraShakeSourceTriggerSection.h"
 
#include "MovieSceneCameraShakeSystem.generated.h"
 
namespace UE::MovieScene
{
    struct FPreAnimatedCameraShakeStateStorage;
    struct FPreAnimatedCameraComponentShakeStateStorage;
    struct FPreAnimatedCameraSourceShakeStateStorage;
 
#if WITH_EDITOR
    struct FCameraShakePreviewerLinkerExtension : public TSharedEntitySystemLinkerExtension<FCameraShakePreviewerLinkerExtension>
    {
        static TEntitySystemLinkerExtensionID<FCameraShakePreviewerLinkerExtension> GetExtensionID();
 
        static TSharedPtr<FCameraShakePreviewerLinkerExtension> GetOrCreateExtension(UMovieSceneEntitySystemLinker* Linker);
 
        FCameraShakePreviewerLinkerExtension(UMovieSceneEntitySystemLinker* Linker);
        virtual ~FCameraShakePreviewerLinkerExtension();
 
        TSharedPtr<FCameraShakePreviewer> FindPreviewer(FInstanceHandle InstanceHandle);
        TSharedRef<FCameraShakePreviewer> GetPreviewer(FInstanceHandle InstanceHandle);
        void UpdateAllPreviewers();
        bool HasAnyShake() const;
 
    private:
        void OnLevelViewportClientListChanged();
 
    private:
        TMap<FInstanceHandle, TSharedRef<FCameraShakePreviewer>> Previewers;
    };
#endif
}
 
UCLASS()
class UMovieSceneCameraShakeInstantiatorSystem : public UMovieSceneEntitySystem
{
    GENERATED_BODY()
 
public:
    UMovieSceneCameraShakeInstantiatorSystem(const FObjectInitializer& ObjInit);
 
    virtual bool IsRelevantImpl(UMovieSceneEntitySystemLinker* InLinker) const override;
    virtual void OnLink() override;
    virtual void OnUnlink() override;
 
    virtual void OnRun(FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents) override;
 
    void AddShakeTrigger(UE::MovieScene::FInstanceHandle InInstance, const FGuid& ObjectBindingID, const FFrameTime& InTime, const FMovieSceneCameraShakeSourceTrigger& InTrigger);
 
private:
    void TriggerOneShotShakes();
 
#if WITH_EDITOR
    void OnObjectsReplaced(const TMap<UObject*, UObject*>& ReplacementMap);
#endif
 
private:
    struct FTimedTrigger
    {
        FGuid ObjectBindingID;
        FFrameTime Time;
        FMovieSceneCameraShakeSourceTrigger Trigger;
    };
 
    TSharedPtr<UE::MovieScene::FPreAnimatedCameraShakeStateStorage> PreAnimatedCameraShakeStorage;
    TSharedPtr<UE::MovieScene::FPreAnimatedCameraComponentShakeStateStorage> PreAnimatedCameraComponentShakeStorage;
    TSharedPtr<UE::MovieScene::FPreAnimatedCameraSourceShakeStateStorage> PreAnimatedCameraSourceShakeStorage;
 
    TMap<UE::MovieScene::FInstanceHandle, TArray<FTimedTrigger>> TriggersByInstance;
 
#if WITH_EDITOR
    TSharedPtr<UE::MovieScene::FCameraShakePreviewerLinkerExtension> PreviewerExtension;
#endif
};
 
UCLASS()
class UMovieSceneCameraShakeEvaluatorSystem : public UMovieSceneEntitySystem
{
    GENERATED_BODY()
 
public:
    UMovieSceneCameraShakeEvaluatorSystem(const FObjectInitializer& ObjInit);
 
    virtual void OnLink() override;
    virtual void OnUnlink() override;
    virtual bool IsRelevantImpl(UMovieSceneEntitySystemLinker* InLinker) const override;
    virtual void OnRun(FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents) override;
 
private:
#if WITH_EDITOR
    TSharedPtr<UE::MovieScene::FCameraShakePreviewerLinkerExtension> PreviewerExtension;
#endif
};