//根据路径卸载资源
public void UnloadAsset(string path, bool destroyObj = false)
{
if (string.IsNullOrEmpty(path))
{
return;
}
uint crc = CrcHelper.StringToCRC32(path);
ResourceItem item = null;
if (!AssetCacheDict.TryGetValue(crc, out item) || item == null)
{
return;
}
if (item == null)
{
return;
}
item.RefCount--;
DestroyResourceItem(item, destroyObj);
}
//异步加载资源, 仅仅是不需要实例化的资源,音频,图片等
public void AsyncLoadAsset <T>(string path, OnAsyncResourceObjFinished dealFinished,
LoadAssetPriority priority, object param1 = null,
object param2 = null, object param3 = null, uint crc = 0) where T : UnityEngine.Object
{
if (crc == 0)
{
crc = CrcHelper.StringToCRC32(path);
}
ResourceItem item = GetAssetFromAssetCache(crc);
if (item != null)
{
if (dealFinished != null)
{
dealFinished(path, item.Obj, param1, param2, param3);
}
return;
}
//判断是否在加载中
AsyncLoadAssetParam para = null;
if (!m_loadingAssetDict.TryGetValue(crc, out para) || para == null)
{
para = m_asyncLoadAssetParamPool.Spawn(true);
para.m_crc = crc;
para.m_path = path;
para.m_priority = priority;
//这里应该还少了对Sprite的判定
m_loadingAssetDict.Add(crc, para);
m_loadingAssetList[(int)priority].Add(para);
}
AsyncCallBack callback = m_asyncCallBackPool.Spawn(true);
callback.m_resourceObjDealFinished = dealFinished;
callback.m_param1 = param1;
callback.m_param2 = param2;
callback.m_param3 = param3;
para.m_callbackList.Add(callback);
}
//读取资源依赖文件， 初始化所有资源都一一对应的ResourceItem类对象
public bool LoadAssetBundleConfig()
{
m_resourceItemDict.Clear();
string configPath = ABPathConfig.DependenceFile4AssetBundle;
AssetBundle configAB = AssetBundle.LoadFromFile(configPath);
TextAsset textAsset = configAB.LoadAsset <TextAsset>(ABPathConfig.DependenceFileName);
if (textAsset == null)
{
Debug.Log("AssetBundleConfig is not exists!");
return(false);
}
MemoryStream ms = new MemoryStream(textAsset.bytes);
BinaryFormatter bf = new BinaryFormatter();
AssetBundleConfig abConfig = (AssetBundleConfig)bf.Deserialize(ms);
ms.Close();
for (int i = 0; i < abConfig.ABList.Count; i++)
{
ResourceItem item = new ResourceItem();
ABBase abBase = abConfig.ABList[i];
item.Crc = abBase.Crc;
item.AssetName = abBase.AssetName;
item.ABName = abBase.ABName;
item.DependABList = new List <string>(abBase.DependABList);
if (m_resourceItemDict.ContainsKey(item.Crc) == false)
{
m_resourceItemDict.Add(item.Crc, item);
}
else
{
Debug.Log("重复的Crc, 资源名: " + item.AssetName + ", AB包名: " + item.ABName);
}
}
return(true);
}
//根据资源对象卸载资源
public void UnLoadAsset(Object obj, bool destroyObj = false)
{
if (obj == null)
{
return;
}
ResourceItem item = null;
foreach (ResourceItem resourceItem in AssetCacheDict.Values)
{
if (resourceItem.Guid == obj.GetInstanceID())
{
item = resourceItem;
break;
}
}
if (item == null)
{
return;
}
item.RefCount--;
DestroyResourceItem(item, destroyObj);
}
//根据crc获取ResourceItem， 只负责获取到资源所在AssetBundle.
public ResourceItem LoadResourceItem(uint crc)
{
ResourceItem resourceItem = null;
if (!m_resourceItemDict.TryGetValue(crc, out resourceItem) || resourceItem == null)
{
Debug.Log("没有找到Crc: " + crc.ToString() + "对应的资源!");
return(null);
}
if (resourceItem.Ab != null)
{
return(resourceItem);
}
if (resourceItem.DependABList != null)
{
for (int i = 0; i < resourceItem.DependABList.Count; i++)
{
LoadAssetBundle(resourceItem.DependABList[i]);
}
}
resourceItem.Ab = LoadAssetBundle(resourceItem.ABName);
return(resourceItem);
}
//异步加载资源协程
IEnumerator AsyncLoadAssetCoroutine()
{
List <AsyncCallBack> callbackList = null;
long lastYieldTime = System.DateTime.Now.Ticks;
while (true)
{
bool haveYield = false;
for (int i = 0; i < (int)LoadAssetPriority.NUM; i++)
{
List <AsyncLoadAssetParam> loadingList = m_loadingAssetList[i];
if (loadingList.Count <= 0)
{
continue;
}
//取出第一个要加载的资源参数
AsyncLoadAssetParam param = loadingList[0];
loadingList.RemoveAt(0);
callbackList = param.m_callbackList;
Object obj = null;
ResourceItem item = null;
#if UNITY_EDITOR
if (!m_loadFromAssetBundle)
{
obj = LoadAssetByEditor <Object>(param.m_path);
//模拟异步加载
yield return(new WaitForSeconds(0.5f));
item = AssetBundleManager.Instance.FindResourceItem(param.m_crc);
}
#endif
if (obj == null)
{
item = AssetBundleManager.Instance.LoadResourceItem(param.m_crc);
if (item != null && item.Ab != null)
{
AssetBundleRequest request = null;
if (param.m_Sprite) //图片资源需要特殊处理,因为object不能转Sprite
{
request = item.Ab.LoadAssetAsync <Sprite>(item.AssetName);
}
else
{
request = item.Ab.LoadAssetAsync <Object>(item.AssetName);
}
yield return(request);
if (request.isDone)
{
obj = request.asset;
}
lastYieldTime = System.DateTime.Now.Ticks;
}
}
CacheAsset2AssetCache(param.m_path, ref item, param.m_crc, obj, callbackList.Count);
for (int j = 0; j < callbackList.Count; j++)
{
AsyncCallBack callback = callbackList[j];
if (callback != null && callback.m_gameObjDealFinished != null)
{
GameObjectItem gameObjectItem = callback.m_gameObjectItem;
gameObjectItem.ResourceItem = item;
callback.m_gameObjDealFinished(param.m_path, gameObjectItem, gameObjectItem.Param1, gameObjectItem.Param2, gameObjectItem.Param3);
callback.m_gameObjDealFinished = null;
}
if (callback != null && callback.m_resourceObjDealFinished != null)
{
callback.m_resourceObjDealFinished(param.m_path, obj, callback.m_param1, callback.m_param2, callback.m_param3);
callback.m_resourceObjDealFinished = null;
}
callback.Reset();
m_asyncCallBackPool.Recycle(callback);
}
obj = null;
callbackList.Clear();
m_loadingAssetDict.Remove(param.m_crc);
param.Reset();
m_asyncLoadAssetParamPool.Recycle(param);
if (System.DateTime.Now.Ticks - lastYieldTime > MAXLOADASSETTIME)
{
yield return(null);
lastYieldTime = System.DateTime.Now.Ticks;
haveYield = true;
}
}
//下边的yield return null, 作用于没有异步加载资源请求时
if (!haveYield || System.DateTime.Now.Ticks - lastYieldTime > MAXLOADASSETTIME)
{
lastYieldTime = System.DateTime.Now.Ticks;
yield return(null);
}
}
}