public UAsset GetAsset(string assetPath, Type type, EAssetHints hints)
{
WeakReference assetRef;
UAsset asset = null;
if (_assets.TryGetValue(assetPath, out assetRef) && assetRef.IsAlive)
{
asset = assetRef.Target as UAsset;
if (asset != null)
{
ResourceManager.GetAnalyzer()?.OnAssetAccess(assetPath);
return(asset);
}
}
ResourceManager.GetAnalyzer()?.OnAssetOpen(assetPath);
if (Directory.Exists(assetPath))
{
asset = new UAssetDatabaseFileListAsset(assetPath);
}
else if (IsFileExists(assetPath))
{
asset = new UAssetDatabaseAsset(assetPath, type, hints, Random.Range(_asyncSimMin, _asyncSimMax));
}
else
{
asset = new UFailureAsset(assetPath, type);
}
_assets[assetPath] = new WeakReference(asset);
return(asset);
}
public UAssetBundleAsset(UAssetBundleBundle bundle, string assetPath, Type type, EAssetHints hints)
: base(assetPath, type)
{
_hints = hints;
_bundle = bundle;
_bundle.AddRef();
_bundle.completed += OnBundleLoaded;
}
//TODO: hints
private UAsset GetAsset(string assetPath, bool concrete, Type type, EAssetHints hints)
{
if (_closed)
{
return(null);
}
UAsset asset = null;
WeakReference assetRef;
var transformedAssetPath = TransformAssetPath(assetPath);
if (_assets.TryGetValue(transformedAssetPath, out assetRef) && assetRef.IsAlive)
{
asset = assetRef.Target as UAsset;
if (asset != null)
{
ResourceManager.GetAnalyzer()?.OnAssetAccess(assetPath);
return(asset);
}
}
string bundleName;
if (TryGetBundleNameByAssetPath(transformedAssetPath, out bundleName))
{
var bundle = this.GetBundle(bundleName, hints);
if (bundle != null)
{
try
{
bundle.AddRef();
ResourceManager.GetAnalyzer()?.OnAssetOpen(assetPath);
asset = bundle.CreateAsset(assetPath, type, concrete, hints);
if (asset != null)
{
_assets[TransformAssetPath(assetPath)] = new WeakReference(asset);
return(asset);
}
}
finally
{
bundle.RemoveRef();
}
}
// 不是 Unity 资源包, 不能实例化 AssetBundleUAsset
}
var invalid = new UFailureAsset(assetPath, type);
_assets[TransformAssetPath(assetPath)] = new WeakReference(invalid);
return(invalid);
}
//TODO: hints
private UBundle GetBundle(Manifest.BundleInfo bundleInfo, EAssetHints hints)
{
if (_closed)
{
return(null);
}
UBundle bundle = null;
if (bundleInfo != null)
{
var bundleName = bundleInfo.name;
if (!_bundles.TryGetValue(bundleName, out bundle))
{
switch (bundleInfo.type)
{
case Manifest.BundleType.AssetBundle:
bundle = new UAssetBundleBundle(this, bundleInfo, hints);
break;
case Manifest.BundleType.ZipArchive:
bundle = new UZipArchiveBundle(this, bundleInfo);
break;
case Manifest.BundleType.FileList:
bundle = new UFileListBundle(this, bundleInfo);
break;
}
if (bundle != null)
{
_bundles.Add(bundleName, bundle);
_AddDependencies(bundle, hints, bundle.bundleInfo.dependencies);
// 第一次访问 UBundle 时进入此处逻辑, 但这之前可能已经使用 EnsureBundles 等方式发起文件下载
// 优先检查是否已经存在下载中的任务, 如果已经存在下载任务, 任务完成时将自动调用 UBundle.Load(stream)
var bundleJob = _FindDownloadJob(bundle.name);
if (bundleJob == null)
{
if (!LoadBundleFile(bundle))
{
DownloadBundleFile(bundle.bundleInfo, null);
}
}
}
}
}
return(bundle);
}
public UAssetDatabaseAsset(string assetPath, Type type, EAssetHints hints, float delay)
: base(assetPath, type)
{
if ((hints & EAssetHints.Synchronized) == 0 && delay > 0f)
{
JobScheduler.DispatchMainAfter(() =>
{
_OnAssetLoaded();
}, delay);
}
else
{
_OnAssetLoaded();
}
}
private void _AddDependencies(UBundle bundle, EAssetHints hints, string[] dependencies)
{
if (dependencies != null)
{
for (int i = 0, size = dependencies.Length; i < size; i++)
{
var depBundleInfo = dependencies[i];
var depBundle = GetBundle(depBundleInfo, hints);
if (bundle.AddDependency(depBundle))
{
_AddDependencies(bundle, hints, depBundle.bundleInfo.dependencies);
}
}
}
}
public UAsset GetAsset(string assetPath, Type type, EAssetHints hints)
{
WeakReference assetRef;
UAsset asset = null;
if (_assets.TryGetValue(assetPath, out assetRef) && assetRef.IsAlive)
{
asset = assetRef.Target as UAsset;
if (asset != null)
{
ResourceManager.GetAnalyzer()?.OnAssetAccess(assetPath);
return(asset);
}
}
ResourceManager.GetAnalyzer()?.OnAssetOpen(assetPath);
asset = new UBuiltinAsset(assetPath, type, hints);
_assets[assetPath] = new WeakReference(asset);
return(asset);
}
public UBuiltinAsset(string assetPath, Type type, EAssetHints hints)
: base(assetPath, type)
{
var resPath = assetPath;
var prefix = "Assets/";
if (resPath.StartsWith(prefix))
{
resPath = resPath.Substring(prefix.Length);
}
if ((hints & EAssetHints.Synchronized) != 0)
{
_object = type != null?Resources.Load(resPath, type) : Resources.Load(resPath);
Complete();
}
else
{
var request = type != null?Resources.LoadAsync(resPath, type) : Resources.LoadAsync(resPath);
request.completed += OnResourceLoaded;
}
}
public UAssetBundleConcreteAsset(UAssetBundleBundle bundle, string assetPath, Type type, EAssetHints hints)
: base(bundle, assetPath, type, hints)
{
}
public override UAsset CreateAsset(string assetPath, Type type, bool concrete, EAssetHints hints)
{
if (concrete)
{
return(new UAssetBundleConcreteAsset(this, assetPath, type, hints));
}
return(new UAssetBundleAsset(this, assetPath, type, hints));
}
public UAssetBundleBundle(BundleAssetProvider provider, Manifest.BundleInfo bundleInfo, EAssetHints hints)
: base(bundleInfo)
{
_hints = hints;
_provider = provider;
}
public override UAsset CreateAsset(string assetPath, Type type, bool concrete, EAssetHints hints)
{
if (_disposed)
{
return(null);
}
return(new UFileListBundleAsset(this, assetPath));
}
public UAsset GetAsset(string assetPath, Type type, EAssetHints hints)
{
return(GetAsset(assetPath, true, type, hints));
}
public UBundle GetBundle(string bundleName, EAssetHints hints)
{
var bundleInfo = GetBundleInfo(bundleName);
return(GetBundle(bundleInfo, hints));
}
public abstract UAsset CreateAsset(string assetPath, Type type, bool concrete, EAssetHints hints);
public override UAsset CreateAsset(string assetPath, Type type, bool concrete, EAssetHints hints)
{
return(new UZipArchiveBundleAsset(this, assetPath));
}
//TODO: hints
public UAssetBundleConcreteAsset(UAssetBundleBundle bundle, string assetPath, Type type, EAssetHints hints)
: base(bundle, assetPath, type)
{
_objects = _emptyObjects;
}