//
private void _LoadAssetBundleInternal(string abPath, bool isDep)
{
AssetBundleReference abRef;
if (_loadedAssetBundles.TryGetValue(abPath, out abRef))
{
//已经加载了，持有一个依赖引用
if (isDep)
{
abRef.Depend();
}
return;
}
AssetBundle ab = AssetBundle.LoadFromFile(GetFullPath(abPath));
if (ab == null)
{
return;
}
abRef = new AssetBundleReference();
abRef._assetbundle = ab;
abRef._path = abPath;
_loadedAssetBundles.Add(abPath, abRef);
if (isDep)
{
abRef.Depend();
}
}
//尝试加载一个AB
//加载过了直接返回，没有加载过，会执行异步加载
//如果加载的是依赖，会增加依赖计数
private IEnumerator _LoadAssetBundleInternalAsync(string abPath, bool isDep)
{
AssetBundleReference abRef;
if (_loadedAssetBundles.TryGetValue(abPath, out abRef))
{
//已经加载了，持有一个依赖引用
if (isDep)
{
abRef.Depend();
}
yield break;
}
//如果在加载队列里
if (_loadingAssetBundles.Contains(abPath))
{
//等待加载完成
while (_loadingAssetBundles.Contains(abPath))
{
yield return(null);
}
//加载完成了，但是可能加载失败，获取一次
if (isDep)
{
if (_loadedAssetBundles.TryGetValue(abPath, out abRef))
{
//持有一个依赖引用
abRef.Depend();
}
}
yield break;
}
_loadingAssetBundles.Add(abPath);
AssetBundleCreateRequest request = AssetBundle.LoadFromFileAsync(GetFullPath(abPath));
yield return(request);
//加载完成s
if (request.assetBundle == null)
{
if (_loadingAssetBundles.Contains(abPath))
{
_loadingAssetBundles.Remove(abPath);
}
yield break;
}
abRef = new AssetBundleReference();
abRef._assetbundle = request.assetBundle;
abRef._path = abPath;
_loadedAssetBundles.Add(abPath, abRef);
//如果还在加载队列里，则记录依赖引用；不在加载队列里，说明提交底层加载后，AB却被Unload了
if (_loadingAssetBundles.Contains(abPath))
{
if (isDep)
{
abRef.Depend();
}
_loadingAssetBundles.Remove(abPath);
}
}