/// <summary>
/// 强制异步为同步加载
/// </summary>
/// <param name="obj"></param>
private void ForceLoadAsyncToSync(AssetBundleObject obj)
{
if (obj.Request != null)
{
obj.AssetBundle = obj.Request.assetBundle;
obj.Request = null;
}
}
/// <summary>
/// 同步加载
/// </summary>
/// <param name="abName"></param>
/// <returns></returns>
private AssetBundleObject LoadAssetBundleSync(string abName)
{
AssetBundleObject obj = null;
var status = GetobjStatus(abName);
if (status == objStatus.None) // 未加载
{
obj = Createobj(abName, false);
DoLoad(obj, false);
PutobjInQueue(objStatus.Loaded, obj);
return(obj);
}
obj = GetobjFromQueue(abName);
if (obj == null)
{
Debug.Log("obj no found!!! -> " + abName);
return(null);
}
obj.RefCount++;
foreach (var o in obj.Depends) // 加载依赖项
{
LoadAssetBundleSync(o.HashName);
}
PutobjInQueue(objStatus.Loaded, obj);
if (status == objStatus.Loaded)
{
return(obj); // 已加载
}
if (status == objStatus.Ready)
{
DoLoad(obj, false);
}
else if (status == objStatus.Loading) // 强制异步为同步加载
{
ForceLoadAsyncToSync(obj);
}
DoLoadedCallFun(obj, false);
return(obj);
}
/// <summary>
/// 加载
/// </summary>
/// <param name="obj"></param>
/// <param name="isAsync">是否异步</param>
private void DoLoad(AssetBundleObject obj, bool isAsync = true)
{
string assetName = obj.HashName.ToLower() + ".ab";
string dir = Utility.GetAssetBundlePath(assetName);
if (isAsync)
{
obj.Request = AssetBundle.LoadFromFileAsync(dir);
}
else
{
obj.AssetBundle = AssetBundle.LoadFromFile(dir);
}
}
/// <summary>
/// 计算某个资源包的引用计数
/// </summary>
/// <param name="obj"></param>
private void DoDependsRef(AssetBundleObject obj)
{
obj.RefCount++;
if (obj.Depends.Count == 0)
{
return;
}
foreach (var dpObj in obj.Depends)
{
DoDependsRef(dpObj); //递归依赖项，加载完
}
}
/// <summary>
/// 卸载资源
/// </summary>
/// <param name="obj"></param>
private void DoUnLoad(AssetBundleObject obj)
{
// 这里用true，卸载Asset内存，实现指定卸载
if (obj.AssetBundle == null)
{
string errormsg = string.Format("LoadAssetbundle DoUnload error ! assetName:{0}", obj.HashName);
Debug.LogError(errormsg);
return;
}
obj.AssetBundle.Unload(true);
obj.AssetBundle = null;
}
/// <summary>
/// 将资源包加入某个队列
/// </summary>
/// <param name="status"></param>
/// <param name="obj"></param>
private void PutobjInQueue(objStatus status, AssetBundleObject obj)
{
var hashName = obj.HashName;
var curStatus = GetobjStatus(hashName);
// 清除上一个状态
if (curStatus != objStatus.None)
{
GetQueue(curStatus).Remove(hashName);
}
if (status != objStatus.None)
{
GetQueue(status).Add(obj.HashName, obj);
}
}
/// <summary>
// 异步加载
/// </summary>
/// <param name="abName"></param>
/// <param name="callFun"></param>
private AssetBundleObject LoadAssetBundleAsync(string abName, AssetBundleLoadCallBack callFun)
{
AssetBundleObject obj = null;
var status = GetobjStatus(abName);
// 未加载过
if (status == objStatus.None)
{
obj = Createobj(abName);
obj.CallFunList.Add(callFun);
// 移入准备队列
PutobjInQueue(objStatus.Ready, obj);
return(obj);
}
obj = GetobjFromQueue(abName);
if (obj == null)
{
Debug.Log("obj no found!!! -> " + abName);
return(null);
}
DoDependsRef(obj);
if (status == objStatus.Loaded) // 已加载
{
callFun?.Invoke(obj.AssetBundle);
}
else
{
obj.CallFunList.Add(callFun);
}
return(obj);
}
/// <summary>
/// 加载资源后的回调，（暂未提供服务器下载资源）
/// </summary>
/// <param name="obj"></param>
/// <param name="isAsync"></param>
private void DoLoadedCallFun(AssetBundleObject obj, bool isAsync = true)
{
if (obj.AssetBundle == null) // 如果还没加载到ab包, 网上下载，先同步下载
{
}
if (obj.AssetBundle == null) // 未同步下载到，直接移除
{
PutobjInQueue(objStatus.None, obj);
}
if (obj.AssetBundle == null && isAsync) // 异步下载
{
}
foreach (var callback in obj.CallFunList)
{
callback?.Invoke(obj.AssetBundle);
}
Debug.Log(obj.HashName);
obj.CallFunList.Clear();
}
/// <summary>
/// 创建新的异步资源包
/// </summary>
/// <param name="abName"></param>
/// <returns></returns>
private AssetBundleObject Createobj(string abName, bool isAsync = true)
{
var obj = new AssetBundleObject()
{
RefCount = 1,
HashName = abName,
DependLoadingCount = 0,
};
if (dependsDataDic.ContainsKey(abName))
{
var dps = dependsDataDic[abName];
if (dps != null && dps.Length > 0)
{
// 异步加载，需要加载完所有依赖项
if (isAsync)
{
obj.DependLoadingCount = dps.Length;
}
AssetBundleObject dpObj = null;
foreach (var d in dps)
{
if (!isAsync) // 同步
{
dpObj = LoadAssetBundleSync(d);
}
else
{
dpObj = LoadAssetBundleAsync(d, (ab) =>
{
if (obj.DependLoadingCount <= 0)
{
return;
}
obj.DependLoadingCount--;
if (obj.DependLoadingCount == 0 && obj.Request != null && obj.Request.isDone) // 立即执行
{
DoLoadedCallFun(obj);
}
});
}
if (dpObj == null)
{
Debug.Log("curobj is null!!!");
}
else
{
obj.Depends.Add(dpObj);
}
}
}
}
return(obj);
}
