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Tools/ObjectPooler/IPooledObject.cs

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+public interface IPooledObject{
+    void OnObjectSpawn();
+}

Tools/ObjectPooler/IPooledObject.cs.meta

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Tools/ObjectPooler/Pool.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+[CreateAssetMenu(fileName = "New Pool", menuName = "Tools/Pool", order = 0)]
+public class Pool : ScriptableObject{
+
+    public List<PoolPrefab> pools;
+    [System.Serializable]
+    public class PoolPrefab{
+        public string tag;
+        public GameObject prefab;
+        public bool undetermined;
+        public int size;
+
+        [HideInInspector] public Queue<GameObject> determinedPool;
+        [HideInInspector] public List<GameObject> undeterminedPool;
+    }
+}

Tools/ObjectPooler/Pool.cs.meta

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Tools/ObjectPooler/Pooler.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+public static class Pooler{
+
+    class PoolChecker : MonoBehaviour {
+        public string poolTag;
+    }
+
+    static Dictionary<string, Pool.PoolPrefab> poolDictionary;
+    static Scene poolScene;
+
+    public static void CreatePools(Pool pool){
+        poolDictionary = new Dictionary<string, Pool.PoolPrefab>();
+        poolScene = SceneManager.CreateScene("PoolScene");
+
+        foreach(Pool.PoolPrefab p in pool.pools){
+            if (!p.undetermined){
+                p.determinedPool = new Queue<GameObject>();
+                for (int i = 0; i < p.size; i++){
+                    GameObject obj = Object.Instantiate(p.prefab);
+                    obj.SetActive(false);
+                    obj.AddComponent<PoolChecker>().poolTag = p.tag;
+                    SceneManager.MoveGameObjectToScene(obj, poolScene);
+                    p.determinedPool.Enqueue(obj);
+                }
+            }else{
+                p.undeterminedPool = new List<GameObject>();
+            }
+            poolDictionary.Add(p.tag, p);
+        }
+    }
+    public static void CreatePools(Pool[] pools){
+        poolDictionary = new Dictionary<string, Pool.PoolPrefab>();
+        poolScene = SceneManager.CreateScene("PoolScene");
+
+        for (int i = 0; i < pools.Length; i++){
+            foreach (Pool.PoolPrefab p in pools[i].pools){
+                if (!p.undetermined){
+                    p.determinedPool = new Queue<GameObject>();
+                    for (int j = 0; j < p.size; j++){
+                        GameObject obj = Object.Instantiate(p.prefab);
+                        obj.SetActive(false);
+                        obj.AddComponent<PoolChecker>().poolTag = p.tag;
+                        SceneManager.MoveGameObjectToScene(obj, poolScene);
+                        p.determinedPool.Enqueue(obj);
+                    }
+                }else{
+                    p.undeterminedPool = new List<GameObject>();
+                }
+                poolDictionary.Add(p.tag, p);
+            }
+        }
+    }
+    public static void Destroy(GameObject gameObject){
+        PoolChecker poolChecker = gameObject.GetComponent<PoolChecker>();
+        if (poolChecker == null){
+            Debug.LogWarning("GameObject: " + gameObject + " isn't from a pool", gameObject);
+            return;
+        }
+
+        gameObject.transform.SetParent(null);
+        SceneManager.MoveGameObjectToScene(gameObject, poolScene);
+
+        if (poolDictionary.ContainsKey(poolChecker.poolTag)){
+            Pool.PoolPrefab pool = poolDictionary[poolChecker.poolTag];
+            if (pool.undetermined){
+                gameObject.SetActive(false);
+                pool.undeterminedPool.Remove(gameObject);
+            }else{
+                gameObject.SetActive(false);
+            }
+        }
+    }
+
+    public static GameObject SpawnFromPool(string tag, Vector3 position){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.Log("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        Pool.PoolPrefab pool = poolDictionary[tag];
+        GameObject objectToSpawn;
+        if (!pool.undetermined){
+            objectToSpawn = pool.determinedPool.Dequeue();
+
+            objectToSpawn.transform.position = position;
+            objectToSpawn.transform.rotation = Quaternion.identity;
+            objectToSpawn.SetActive(true);
+
+            pool.determinedPool.Enqueue(objectToSpawn);
+        }else{
+            if(pool.undeterminedPool.Count != 0){
+                int lastIndex = pool.undeterminedPool.Count - 1;
+                objectToSpawn = pool.undeterminedPool[lastIndex];
+
+                objectToSpawn.transform.position = position;
+                objectToSpawn.transform.rotation = Quaternion.identity;
+                objectToSpawn.SetActive(true);
+            }else{
+                objectToSpawn = Object.Instantiate(pool.prefab, position, Quaternion.identity);
+                SceneManager.MoveGameObjectToScene(objectToSpawn, poolScene);
+                objectToSpawn.AddComponent<PoolChecker>().poolTag = tag;
+            }
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if(pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+        return objectToSpawn;
+    }
+    public static GameObject SpawnFromPool(string tag, Vector3 position, Transform parent){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.Log("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        Pool.PoolPrefab pool = poolDictionary[tag];
+        GameObject objectToSpawn;
+        if (!pool.undetermined){
+            objectToSpawn = pool.determinedPool.Dequeue();
+
+            objectToSpawn.transform.position = position;
+            objectToSpawn.transform.rotation = Quaternion.identity;
+            objectToSpawn.transform.SetParent(parent);
+            objectToSpawn.SetActive(true);
+
+            pool.determinedPool.Enqueue(objectToSpawn);
+        }else{
+            if (pool.undeterminedPool.Count != 0){
+                int lastIndex = pool.undeterminedPool.Count - 1;
+                objectToSpawn = pool.undeterminedPool[lastIndex];
+
+                objectToSpawn.transform.position = position;
+                objectToSpawn.transform.rotation = Quaternion.identity;
+                objectToSpawn.transform.SetParent(parent);
+                objectToSpawn.SetActive(true);
+            }else{
+                objectToSpawn = Object.Instantiate(pool.prefab, position, Quaternion.identity, parent);
+                objectToSpawn.AddComponent<PoolChecker>().poolTag = tag;
+            }
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+        return objectToSpawn;
+    }
+    public static GameObject SpawnFromPool(string tag, Vector3 position, Transform parent, bool instantiateInWorldSpace){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.Log("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        if (!instantiateInWorldSpace){
+            SpawnFromPool(tag, position, parent);
+        }
+
+        Pool.PoolPrefab pool = poolDictionary[tag];
+        GameObject objectToSpawn;
+        if (!pool.undetermined){
+            objectToSpawn = pool.determinedPool.Dequeue();
+
+            objectToSpawn.transform.localPosition = position;
+            objectToSpawn.transform.localRotation = Quaternion.identity;
+            objectToSpawn.transform.SetParent(parent);
+            objectToSpawn.SetActive(true);
+
+            pool.determinedPool.Enqueue(objectToSpawn);
+        }else{
+            if (pool.undeterminedPool.Count != 0){
+                int lastIndex = pool.undeterminedPool.Count - 1;
+                objectToSpawn = pool.undeterminedPool[lastIndex];
+
+                objectToSpawn.transform.localPosition = position;
+                objectToSpawn.transform.localRotation = Quaternion.identity;
+                objectToSpawn.transform.SetParent(parent);
+                objectToSpawn.SetActive(true);
+            }else{
+                objectToSpawn = Object.Instantiate(pool.prefab);
+                objectToSpawn.transform.localPosition = position;
+                objectToSpawn.transform.localRotation = Quaternion.identity;
+                objectToSpawn.transform.SetParent(parent);
+                objectToSpawn.AddComponent<PoolChecker>().poolTag = tag;
+            }
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+        return objectToSpawn;
+    }
+    public static GameObject SpawnFromPool(string tag, Vector3 position, Quaternion rotation){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.Log("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        Pool.PoolPrefab pool = poolDictionary[tag];
+        GameObject objectToSpawn;
+        if (!pool.undetermined){
+            objectToSpawn = pool.determinedPool.Dequeue();
+
+            objectToSpawn.transform.position = position;
+            objectToSpawn.transform.rotation = rotation;
+            objectToSpawn.SetActive(true);
+
+            pool.determinedPool.Enqueue(objectToSpawn);
+        }else{
+            if (pool.undeterminedPool.Count != 0){
+                int lastIndex = pool.undeterminedPool.Count - 1;
+                objectToSpawn = pool.undeterminedPool[lastIndex];
+
+                objectToSpawn.transform.position = position;
+                objectToSpawn.transform.rotation = rotation;
+                objectToSpawn.SetActive(true);
+            }else{
+                objectToSpawn = Object.Instantiate(pool.prefab, position, rotation);
+                SceneManager.MoveGameObjectToScene(objectToSpawn, poolScene);
+                objectToSpawn.AddComponent<PoolChecker>().poolTag = tag;
+            }
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+        return objectToSpawn;
+    }
+    public static GameObject SpawnFromPool(string tag, Vector3 position, Quaternion rotation, Transform parent){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.Log("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        Pool.PoolPrefab pool = poolDictionary[tag];
+        GameObject objectToSpawn;
+        if (!pool.undetermined){
+            objectToSpawn = pool.determinedPool.Dequeue();
+
+            objectToSpawn.transform.position = position;
+            objectToSpawn.transform.rotation = rotation;
+            objectToSpawn.transform.SetParent(parent);
+            objectToSpawn.SetActive(true);
+
+            pool.determinedPool.Enqueue(objectToSpawn);
+        }else{
+            if (pool.undeterminedPool.Count != 0){
+                int lastIndex = pool.undeterminedPool.Count - 1;
+                objectToSpawn = pool.undeterminedPool[lastIndex];
+
+                objectToSpawn.transform.position = position;
+                objectToSpawn.transform.rotation = rotation;
+                objectToSpawn.transform.SetParent(parent);
+                objectToSpawn.SetActive(true);
+            }else{
+                objectToSpawn = Object.Instantiate(pool.prefab, position, rotation, parent);
+                objectToSpawn.AddComponent<PoolChecker>().poolTag = tag;
+            }
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+        return objectToSpawn;
+    }
+    public static GameObject SpawnFromPool(string tag, Vector3 position, Quaternion rotation, Transform parent, bool instantiateInWorldSpace){
+        if (!poolDictionary.ContainsKey(tag)){
+            Debug.Log("Pool with tag " + tag + " doesn't exist.");
+            return null;
+        }
+
+        if (!instantiateInWorldSpace){
+            SpawnFromPool(tag, position, rotation, parent);
+        }
+
+        Pool.PoolPrefab pool = poolDictionary[tag];
+        GameObject objectToSpawn;
+        if (!pool.undetermined){
+            objectToSpawn = pool.determinedPool.Dequeue();
+
+            objectToSpawn.transform.localPosition = position;
+            objectToSpawn.transform.localRotation = rotation;
+            objectToSpawn.transform.SetParent(parent);
+            objectToSpawn.SetActive(true);
+
+            pool.determinedPool.Enqueue(objectToSpawn);
+        }else{
+            if (pool.undeterminedPool.Count != 0){
+                int lastIndex = pool.undeterminedPool.Count - 1;
+                objectToSpawn = pool.undeterminedPool[lastIndex];
+
+                objectToSpawn.transform.localPosition = position;
+                objectToSpawn.transform.localRotation = rotation;
+                objectToSpawn.transform.SetParent(parent);
+                objectToSpawn.SetActive(true);
+            }else{
+                objectToSpawn = Object.Instantiate(pool.prefab);
+                objectToSpawn.transform.localPosition = position;
+                objectToSpawn.transform.localRotation = rotation;
+                objectToSpawn.transform.SetParent(parent);
+                objectToSpawn.AddComponent<PoolChecker>().poolTag = tag;
+            }
+        }
+
+        IPooledObject pooledObj = objectToSpawn.GetComponent<IPooledObject>();
+        if (pooledObj != null){
+            pooledObj.OnObjectSpawn();
+        }
+        return objectToSpawn;
+    }
+}

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