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Source/first/Variant_Shooter/AI/ShooterAIController.h

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+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "AIController.h"
+#include "ShooterAIController.generated.h"
+
+class UStateTreeAIComponent;
+class UAIPerceptionComponent;
+struct FAIStimulus;
+
+DECLARE_DELEGATE_TwoParams(FShooterPerceptionUpdatedDelegate, AActor*, const FAIStimulus&);
+DECLARE_DELEGATE_OneParam(FShooterPerceptionForgottenDelegate, AActor*);
+
+/**
+ *  Simple AI Controller for a first person shooter enemy
+ */
+UCLASS(abstract)
+class FIRST_API AShooterAIController : public AAIController
+{
+	GENERATED_BODY()
+	
+	/** Runs the behavior StateTree for this NPC */
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components", meta = (AllowPrivateAccess = "true"))
+	UStateTreeAIComponent* StateTreeAI;
+
+	/** Detects other actors through sight, hearing and other senses */
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components", meta = (AllowPrivateAccess = "true"))
+	UAIPerceptionComponent* AIPerception;
+
+protected:
+
+	/** Team tag for pawn friend or foe identification */
+	UPROPERTY(EditAnywhere, Category="Shooter")
+	FName TeamTag = FName("Enemy");
+
+	/** Enemy currently being targeted */
+	TObjectPtr<AActor> TargetEnemy;
+
+public:
+
+	/** Called when an AI perception has been updated. StateTree task delegate hook */
+	FShooterPerceptionUpdatedDelegate OnShooterPerceptionUpdated;
+
+	/** Called when an AI perception has been forgotten. StateTree task delegate hook */
+	FShooterPerceptionForgottenDelegate OnShooterPerceptionForgotten;
+
+public:
+
+	/** Constructor */
+	AShooterAIController();
+
+protected:
+
+	/** Pawn initialization */
+	virtual void OnPossess(APawn* InPawn) override;
+
+protected:
+
+	/** Called when the possessed pawn dies */
+	UFUNCTION()
+	void OnPawnDeath();
+
+public:
+
+	/** Sets the targeted enemy */
+	void SetCurrentTarget(AActor* Target);
+
+	/** Clears the targeted enemy */
+	void ClearCurrentTarget();
+
+	/** Returns the targeted enemy */
+	AActor* GetCurrentTarget() const { return TargetEnemy; };
+
+protected:
+
+	/** Called when the AI perception component updates a perception on a given actor */
+	UFUNCTION()
+	void OnPerceptionUpdated(AActor* Actor, FAIStimulus Stimulus);
+
+	/** Called when the AI perception component forgets a given actor */
+	UFUNCTION()
+	void OnPerceptionForgotten(AActor* Actor);
+};