Add Enemy Batching

Source/vampires/EnemyCharacter.cpp

@@ -8,6 +8,7 @@
 
 AEnemyCharacter::AEnemyCharacter(const FObjectInitializer& ObjectInitializer)
 {
+	ObjectPoolComponent = CreateDefaultSubobject<UObjectPoolComponent>(TEXT("Object Pool Component"));
 }
 
 void AEnemyCharacter::BeginPlay()
@@ -15,6 +16,8 @@ void AEnemyCharacter::BeginPlay()
 	Super::BeginPlay();
 	GetHealthComponent()->OnDamaged.BindUFunction(this, "OnDamaged");
 	GetHealthComponent()->OnDeath.BindUFunction(this, "OnDeath");
+
+	ObjectPoolComponent->OnRetrieve.BindUFunction(this, "ResetHealth");
 }
 
 void AEnemyCharacter::Tick(float DeltaTime)
@@ -33,8 +36,6 @@ void AEnemyCharacter::OnDamaged()
 
 void AEnemyCharacter::OnDeath()
 {
-	//if (IsValid(EXPPickupTemplate))
-	//{
 	FActorSpawnParameters actorSpawnParameters;
 	actorSpawnParameters.Owner = this;
 	actorSpawnParameters.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AlwaysSpawn;
@@ -45,5 +46,10 @@ void AEnemyCharacter::OnDeath()
 
 	AVampireGameMode* gamemode = Cast<AVampireGameMode>(UGameplayStatics::GetGameMode(GetWorld()));
 	gamemode->IncrementEnemyDeathCount();
-	//}
+	gamemode->GetEnemyObjectPoolManager()->ReturnObject(this);
+}
+
+void AEnemyCharacter::ResetHealth()
+{
+	GetHealthComponent()->ResetHealth();
 }

Source/vampires/EnemyCharacter.h

@@ -4,6 +4,7 @@
 
 #include "CoreMinimal.h"
 #include "EXPPickup.h"
+#include "ObjectPoolComponent.h"
 #include "VampireCharacter.h"
 #include "BehaviorTree/BehaviorTree.h"
 #include "EnemyCharacter.generated.h"
@@ -21,10 +22,11 @@ public:
 	TSubclassOf<AEXPPickup> EXPPickupTemplate = nullptr;
 
 private:
-
 	UPROPERTY(EditDefaultsOnly, Meta = (AllowPrivateAccess = "true"))
 	UBehaviorTree* BehaviorTree = nullptr;
 
+	UObjectPoolComponent* ObjectPoolComponent = nullptr;
+
 public:
 	AEnemyCharacter(const FObjectInitializer& ObjectInitializer);
 
@@ -41,4 +43,8 @@ public:
 
 	UFUNCTION()
 	virtual void OnDeath();
+
+private:
+	UFUNCTION()
+	void ResetHealth();
 };

Source/vampires/HealthComponent.cpp

@@ -70,6 +70,7 @@ void UHealthComponent::SetCurrentHealth(float value)
 void UHealthComponent::ResetHealth()
 {
 	CurrentHealth = MaxHealth;
+	IsDead = false;
 }
 
 void UHealthComponent::RecoverHealth(float value)

Source/vampires/ObjectPoolComponent.cpp

@@ -0,0 +1,5 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "ObjectPoolComponent.h"
+

Source/vampires/ObjectPoolComponent.h

@@ -0,0 +1,21 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Components/ActorComponent.h"
+#include "ObjectPoolComponent.generated.h"
+
+
+DECLARE_DELEGATE(FOnRetrieve)
+DECLARE_DELEGATE(FOnReturn)
+
+UCLASS(ClassGroup=(Custom), meta=(BlueprintSpawnableComponent))
+class VAMPIRES_API UObjectPoolComponent : public UActorComponent
+{
+	GENERATED_BODY()
+
+public:
+	FOnRetrieve OnRetrieve;
+	FOnReturn OnReturn;
+};

Source/vampires/ObjectPoolManager.cpp

@@ -0,0 +1,69 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "ObjectPoolManager.h"
+
+#include "ObjectPoolComponent.h"
+
+// Called when the game starts or when spawned
+void AObjectPoolManager::BeginPlay()
+{
+	Super::BeginPlay();
+}
+
+void AObjectPoolManager::InitializeObjectPool(TSubclassOf<AActor> Object, const int InitialObjectPoolSize)
+{
+	for (int i = 0; i < InitialObjectPoolSize; i++)
+	{
+		AActor* object = GetWorld()->SpawnActor<AActor>(Object);
+		SetObjectStatus(false, object);
+		ObjectPool.Add(object);
+	}
+}
+
+void AObjectPoolManager::InitializeObjectPool(UClass* Object, int InitialObjectPoolSize)
+{
+	for (int i = 0; i < InitialObjectPoolSize; i++)
+	{
+		AActor* object = GetWorld()->SpawnActor<AActor>(Object);
+		SetObjectStatus(false, object);
+		ObjectPool.Add(object);
+	}
+}
+
+AActor* AObjectPoolManager::GetObject()
+{
+	for (AActor* object : ObjectPool)
+	{
+		if (object->IsHidden())
+		{
+			SetObjectStatus(true, object);
+
+			if (UObjectPoolComponent* objectPoolComponent = object->GetComponentByClass<UObjectPoolComponent>())
+			{
+				objectPoolComponent->OnRetrieve.ExecuteIfBound();
+			}
+
+			return object;
+		}
+	}
+
+	return nullptr;
+}
+
+void AObjectPoolManager::ReturnObject(AActor* object)
+{
+	SetObjectStatus(false, object);
+
+	if (UObjectPoolComponent* objectPoolComponent = object->GetComponentByClass<UObjectPoolComponent>())
+	{
+		objectPoolComponent->OnReturn.ExecuteIfBound();
+	}
+}
+
+void AObjectPoolManager::SetObjectStatus(bool enabled, AActor* object)
+{
+	object->SetActorHiddenInGame(!enabled);
+	object->SetActorTickEnabled(enabled);
+	object->SetActorEnableCollision(enabled);
+}

Source/vampires/ObjectPoolManager.h

@@ -0,0 +1,30 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "GameFramework/Actor.h"
+#include "ObjectPoolManager.generated.h"
+
+UCLASS()
+class VAMPIRES_API AObjectPoolManager : public AActor
+{
+	GENERATED_BODY()
+
+	TArray<AActor*> ObjectPool = TArray<AActor*>();
+
+public:
+	void InitializeObjectPool(TSubclassOf<AActor> Object, int InitialObjectPoolSize = 400);
+	void InitializeObjectPool(UClass* Object, int InitialObjectPoolSize = 400);
+
+	AActor* GetObject();
+
+	void ReturnObject(AActor* object);
+
+protected:
+	// Called when the game starts or when spawned
+	virtual void BeginPlay() override;
+
+private:
+	void SetObjectStatus(bool enabled, AActor* object);
+};

Source/vampires/VampireAIController.cpp

@@ -61,7 +61,7 @@ void AVampireAIController::OnDeath(FDamageInfo info)
 {
 	// TODO: Do stuff here
 	EnemyCharacter->OnDeath();
-	EnemyCharacter->DetachFromControllerPendingDestroy();
+	/*EnemyCharacter->DetachFromControllerPendingDestroy();
 	EnemyCharacter->GetCapsuleComponent()->SetCollisionEnabled(ECollisionEnabled::NoCollision);
 	EnemyCharacter->GetCapsuleComponent()->SetCollisionResponseToAllChannels(ECR_Ignore);
 
@@ -72,7 +72,7 @@ void AVampireAIController::OnDeath(FDamageInfo info)
 		characterMovementComponent->SetComponentTickEnabled(false);
 	}
 	GetWorldTimerManager().ClearTimer(PawnMoveToTimerHandle);
-	EnemyCharacter->SetLifeSpan(0.1f);
+	EnemyCharacter->SetLifeSpan(0.1f);*/
 }
 
 void AVampireAIController::PawnMoveTo()

Source/vampires/VampireGameMode.cpp

@@ -65,7 +65,10 @@ void AVampireGameMode::SpawnEnemy()
 	FActorSpawnParameters SpawnParameters;
 	SpawnParameters.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AlwaysSpawn;
 
-	AEnemyCharacter* Actor = GetWorld()->SpawnActor<AEnemyCharacter>(EnemyTemplate, Transform, SpawnParameters);
+	if (AActor* object = GetEnemyObjectPoolManager()->GetObject())
+	{
+		AEnemyCharacter* Actor = Cast<AEnemyCharacter>(object);
+		Actor->SetActorTransform(Transform);
 		float CapsuleRadius = Actor->GetCapsuleComponent()->GetScaledCapsuleRadius();
 		FVector Direction = SpawnLocation - PlayerCharacter->GetActorLocation();
 		Direction.Normalize();
@@ -73,6 +76,19 @@ void AVampireGameMode::SpawnEnemy()
 		Actor->SetActorLocation(SpawnLocation + Direction);
 		Actor->SpawnDefaultController();
 	}
+}
+
+AObjectPoolManager* AVampireGameMode::GetEnemyObjectPoolManager()
+{
+	if (EnemyObjectPoolManager == nullptr)
+	{
+		EnemyObjectPoolManager = GetWorld()->SpawnActor<AObjectPoolManager>();
+		TSubclassOf<AActor> enemyTemplate = EnemyTemplate;
+		EnemyObjectPoolManager->InitializeObjectPool(enemyTemplate);
+	}
+
+	return EnemyObjectPoolManager;
+}
 
 void AVampireGameMode::IncrementEnemyDeathCount()
 {

Source/vampires/VampireGameMode.h

@@ -4,6 +4,7 @@
 
 #include "CoreMinimal.h"
 #include "EnemyCharacter.h"
+#include "ObjectPoolManager.h"
 #include "PlayerCharacter.h"
 #include "VampirePlayerController.h"
 #include "GameFramework/GameMode.h"
@@ -30,6 +31,8 @@ private:
 
 	int EnemyDeathCount = 0;
 
+	AObjectPoolManager* EnemyObjectPoolManager = nullptr;
+
 protected:
 	virtual void BeginPlay() override;
 
@@ -40,8 +43,9 @@ public:
 	UFUNCTION()
 	void IncrementEnemyDeathCount();
 
-protected:
+	AObjectPoolManager* GetEnemyObjectPoolManager();
 
+protected:
 	UFUNCTION()
 	void SpawnEnemy();
 };