Ytdyklly

I am currently developing a Bullet Hell (shoot-em-up) game for my school project.
I have implemented Object Pooling for my game to recycle mainly bullets. (Though I could use it to recycle enemies in the future if I do need to.)

Currently I have tested this object pooling on bullet and it has worked.
I am looking to receive feedback about my code in order to see if I can do anything about it to make it more efficient and cleaner.

ObjectPool.cs

using System;

using System.Collections.Generic;

using UnityEngine;

using System.Linq;



public class ObjectPool : Singleton<ObjectPool> {



    private List<GameObject> objectPool;



    private void Awake() {

        objectPool = new List<GameObject>();

    }



    /// <summary>

    /// Add a gameobject to the object pool.

    /// </summary>

    /// <param name="objToPool">The gameobject to add to the object pool.</param>

    /// <param name="deactivateObj">Deactivate this gameobject upon storing into the object pool.</param>

    public void AddToPool(GameObject objToPool, bool deactivateObj = true) {

        objectPool.Add(objToPool);



        // If we need to deactivate this gameobject.

        if (deactivateObj) {

            // Set it to not active.

            objToPool.SetActive(false);

        }

    }



    /// <summary>

    /// Fetch a gameobject from the pool, with the gameobject containing the desired component.

    /// </summary>

    /// <typeparam name="T">The type of the component.</typeparam>

    /// <param name="removeFromPool">True if the fetched gameobject needs to be removed from the pool.</param>

    /// <returns>The respective gameobject. (Null if none is found)</returns>

    public GameObject FetchObjectByComponent<T>(bool removeFromPool = true) where T : MonoBehaviour {

        GameObject fetchedObject = null;



        // Foreach game object in the object pool

        foreach (var gameObj in objectPool) {

            // If this gameobject has the desired component.

            if (gameObj.GetComponent<T>() != null) {

                // Fetch this object.

                fetchedObject = gameObj;

                // End loop (an object with the desired component is found.)

                break;

            }

        }



        // If an object is fetched and we need to remove it from the pool.

        if (fetchedObject != null && removeFromPool) {

            // Remove the fetched object from the pool.

            objectPool.Remove(fetchedObject);

        }



        return fetchedObject;

    }



    /// <summary>

    /// Fetch an array of gameobjects that contains the desired component.

    /// </summary>

    /// <typeparam name="T">The type of the component the gameobject must contain.</typeparam>

    /// <param name="maxSize">The max size of the array returned. (Negative for limitless)</param>

    /// <param name="removeFromPool">True to remove the respective fetched gameobject from the object pool.</param>

    /// <returns>The respective fetched game objects.</returns>

    public GameObject FetchObjectsByComponent<T>(int maxSize = -1, bool removeFromPool = true) where T : MonoBehaviour {



        List<GameObject> temp = new List<GameObject>();



        // Loop through the object pool as long as the size limit it not reached.

        for (int i = 0; i < objectPool.Count && i < maxSize; ++i) {

            // If this current object contains the desired component.

            if (objectPool[i].GetComponent<T>() != null) {

                // Add to the temporary list

                temp.Add(objectPool[i]);

            }

        }



        var fetchedObjects = temp.ToArray();



        // If we need to remove the fetched objects from the object pool, remove.

        if (removeFromPool) {

            RemoveObjectsFromPool(fetchedObjects);

        }



        return fetchedObjects;

    }



    /// <summary>

    /// Fetch an array of gameobject based on the given condition.

    /// </summary>

    /// <param name="condition">The condition to check on when fetching gameobjects.</param>

    /// <param name="maxSize">The maximum size of the array returned. (Negative for limitless.)</param>

    /// <param name="removeFromPool">True to remove the respective fetched gameobject from the object pool.</param>

    /// <returns>The respective fetched game objects.</returns>

    public GameObject FetchObjectsByCondition(Func<GameObject, bool> condition, int maxSize = -1, bool removeFromPool = true) {

        // Fetch all the matching objects.

        var fetchedObjects = objectPool.Where(condition).ToArray();



        // If an array size limit is given.

        if (maxSize >= 1) {

            List<GameObject> temp = new List<GameObject>();



            // Loop through the fetched objects, adding to the list as long as the list stays in it's given size limit.

            for (int i = 0; i < fetchedObjects.Length && i < maxSize; ++i) {

                temp.Add(fetchedObjects[i]);

            }



            fetchedObjects = temp.ToArray();

        }



        // If we need to remove the fetched objects from the object pool

        if (removeFromPool) {

            RemoveObjectsFromPool(fetchedObjects);

        }



        return fetchedObjects;

    }



    #region Util



    private void RemoveObjectsFromPool(GameObject objectsToRemove) {

        // For each given object.

        foreach (var gameObject in objectsToRemove) {

            // Remove the given object from the object pool.

            objectPool.Remove(gameObject);

        }

    }



    #endregion

}

I am currently using Unity 2018.3.1f1, if that matters.