migrate changes from audio system

Assets/Scripts/OCES/ResourceLoader.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using JetBrains.Annotations;
+using UnityEngine;
+using Object = UnityEngine.Object;
+
+namespace OCES
+{
+    public class ResourceLoader : MonoBehaviour
+    {
+        readonly Dictionary<string, Object> m_cachedObjects = new();
+        readonly Dictionary<string, List<Action<Object>>> m_pendingCallbacks = new();
+
+        [CanBeNull]
+        internal T LoadSync<T>(string path) where T : Object
+        {
+            if (this.m_cachedObjects.TryGetValue(path, out Object cachedObject))
+            {
+                return cachedObject as T;
+            }
+            
+            T newObject = Resources.Load<T>(path);
+            this.m_cachedObjects.Add(path, newObject);
+            return newObject;
+        }
+
+        internal void LoadAsync<T>(string path, Action<T> onComplete) where T : Object
+        {
+            if (this.m_cachedObjects.TryGetValue(path, out Object cachedObject))
+            {
+                onComplete?.Invoke(cachedObject as T);
+                return;
+            }
+
+            if (this.m_pendingCallbacks.TryGetValue(path, out List<Action<Object>> callbacks))
+            {
+                callbacks.Add(obj => onComplete?.Invoke(obj as T));
+                return;
+            }
+
+            this.m_pendingCallbacks[path] = new List<Action<Object>> { obj => onComplete?.Invoke(obj as T) };
+            ResourceRequest newRequest = Resources.LoadAsync<T>(path);
+            StartCoroutine(HandleAsyncLoadCompletion(path, newRequest));
+        }
+
+        IEnumerator HandleAsyncLoadCompletion(string path, ResourceRequest request)
+        {
+            yield return request;
+
+            if (request.asset)
+            {
+                this.m_cachedObjects[path] = request.asset;
+            }
+
+            if (this.m_pendingCallbacks.Remove(path, out List<Action<Object>> callbacks))
+            {
+                foreach (Action<Object> callback in callbacks)
+                {
+                    callback?.Invoke(request.asset);
+                }
+            }
+        }
+
+        internal void PreloadAsync<T>(string[] paths)
+        {
+            
+        }
+
+        internal void Release<T>(string path)
+        {
+            
+        }
+
+        internal void ReleaseUnused()
+        {
+            
+        }
+    }
+}