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Plugins/GGS/Source/GenericCameraSystem/Public/GCMS_CameraModeStack.h

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+// Copyright 2025 https://yuewu.dev/en  All Rights Reserved.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "GCMS_CameraMode.h"
+#include "UObject/Object.h"
+#include "GCMS_CameraModeStack.generated.h"
+
+
+/**
+ * UGCMS_CameraModeStack
+ *
+ * Stack used for blending camera modes.
+ */
+UCLASS()
+class GENERICCAMERASYSTEM_API UGCMS_CameraModeStack : public UObject
+{
+	GENERATED_BODY()
+
+public:
+	UGCMS_CameraModeStack();
+
+	void ActivateStack();
+	void DeactivateStack();
+
+	bool IsStackActivate() const { return bIsActive; }
+
+	void PushCameraMode(TSubclassOf<UGCMS_CameraMode> CameraModeClass);
+
+	void PopCameraMode(TSubclassOf<UGCMS_CameraMode> CameraModeClass);
+
+	bool EvaluateStack(float DeltaTime, FGCMS_CameraModeView& OutCameraModeView);
+
+	void DrawDebug(UCanvas* Canvas) const;
+
+	// Gets the tag associated with the top layer and the blend weight of it
+	void GetBlendInfo(float& OutWeightOfTopLayer, FGameplayTag& OutTagOfTopLayer) const;
+
+protected:
+	/**
+	 * Get or create new camera mode. 
+	 */
+	UGCMS_CameraMode* GetCameraModeInstance(TSubclassOf<UGCMS_CameraMode> CameraModeClass);
+
+	void UpdateStack(float DeltaTime);
+	void BlendStack(FGCMS_CameraModeView& OutCameraModeView) const;
+
+protected:
+	bool bIsActive;
+
+	/**
+	 * Cached camera mode instance pool.
+	 */
+	UPROPERTY()
+	TArray<TObjectPtr<UGCMS_CameraMode>> CameraModeInstances;
+
+	/**
+	 * The list of active camera mode.
+	 */
+	UPROPERTY()
+	TArray<TObjectPtr<UGCMS_CameraMode>> CameraModeStack;
+};