/// </summary>
/// 加载资源
/// </summary>
/// <param name="resName">资源的相对路径名称</param>
/// <param name="assetType">资源类型</param>
/// <param name="callback">完成回调</param>
/// <returns>返回该资源唯一的加载器</returns>
public static AssetFileLoader LoadAssetFile(string resName, EAssetType assetType, OnAssetFileLoad callback)
{
if (AssetLoadMode == EAssetLoadMode.EditorMode)
{
string loadPath = resName;
return(GetFileLoader(assetType, loadPath, callback, null));
}
else if (AssetLoadMode == EAssetLoadMode.ResourceMode)
{
string loadPath = resName;
return(GetFileLoader(assetType, loadPath, callback, null));
}
else if (AssetLoadMode == EAssetLoadMode.BundleMode)
{
if (BundleMethod == null)
{
throw new Exception("AssetSystem.BundleMethod is null.");
}
string manifestPath = AssetPathHelper.ConvertResourcePathToManifestPath(resName);
string loadPath = BundleMethod.GetAssetBundleLoadPath(manifestPath);
return(GetFileLoader(assetType, loadPath, callback, manifestPath));
}
else
{
throw new NotImplementedException($"{AssetLoadMode}");
}
}
/// <summary>
/// 从缓存列表里获取加载器，如果不存在创建一个新的加载器并添加到列表
/// </summary>
public static AssetFileLoader GetFileLoader(EAssetType assetType, string loadPath, OnAssetFileLoad callback, string manifestPath)
{
// 如果已经提交相同请求
AssetFileLoader loader = TryGetFileLoaderInternal(loadPath);
if (loader != null)
{
loader.Reference(); //引用计数
if (loader.IsDone())
{
if (callback != null)
{
callback.Invoke(loader);
}
}
else
{
if (callback != null)
{
loader.LoadCallback += callback;
}
}
return(loader);
}
// 创建加载器
AssetFileLoader newLoader = null;
if (AssetLoadMode == EAssetLoadMode.EditorMode)
{
newLoader = new AssetDatabaseLoader(assetType, loadPath);
}
else if (AssetLoadMode == EAssetLoadMode.ResourceMode)
{
newLoader = new AssetResourceLoader(assetType, loadPath);
}
else if (AssetLoadMode == EAssetLoadMode.BundleMode)
{
newLoader = new AssetBundleLoader(assetType, loadPath, manifestPath);
}
else
{
throw new NotImplementedException($"{AssetLoadMode}");
}
// 新增下载需求
_fileLoaders.Add(newLoader);
newLoader.LoadCallback = callback;
newLoader.Reference(); //引用计数
newLoader.Update(); //立刻轮询
return(newLoader);
}
