AB自動設定标簽
檔案夾中每個prefab，單獨打包成一個assetbundle，使用于模型，單個UI面闆
檔案夾内每個檔案夾打包成一個assetbundle，适用于圖集
所有AB分發器配置資料在Editor/AssetBundle/Database/AssetPackage中，該目錄下存在目錄的一個映射結構，其中的每個序列化檔案對應一個AB分發器
在打包前執行 make tag，通過讀上面對應配置，自動設定ab标簽與名字
public AssetBundleChecker(AssetBundleCheckerConfig config)
{
this.config = config;
assetsPath = AssetBundleUtility.PackagePathToAssetsPath(config.PackagePath);
importer = AssetBundleImporter.GetAtPath(assetsPath);
}
public void CheckAssetBundleName()
{
if (!importer.IsValid)
{
return;
}
var checkerFilters = config.CheckerFilters;
if (checkerFilters == null || checkerFilters.Count == 0)
{
importer.assetBundleName = assetsPath;
string[] bufName = importer.assetBundleName.Split('.');
MenuAssetBundle.m_abNameStr.AppendFormat("public const string {0} = \"{1}\";", bufName[0], bufName[0]);
MenuAssetBundle.m_abNameStr.AppendLine();
} AB打包
采用增量打包方式，隻會打包改動的資源
BuildPipeline.BuildAssetBundles(info.outputDirectory, info.options, info.buildTarget);
調用該函數，unity會自動根據資源的标簽進行打包，而且是增量打包，
- 對于資源沒有變更的bundle包，不會觸發重新打包；
- 資源沒變，即使生成目錄下的bundle包被删除了，unity也不會重新打包；
- 生成目錄下的bundle包對應的manifase被删了，會重新打包；
- 可以使用BuildAssetBundleOptions.ForceRebuildAssetBundle參數觸發強制重新打包。
打包完畢把md5資訊寫入
FileStream fs = new FileStream(newFilePath, FileMode.CreateNew);
StreamWriter sw = new StreamWriter(fs);
for (int i = 0; i < files.Count; i++)
{
string file = files[i];
//if (file.Contains("StreamingAssets")) continue;
string ext = Path.GetExtension(file);
if (file.EndsWith(".meta") || file.Contains(".DS_Store")) continue;
string md5 = NTG.Util.md5file(file);
string value = file.Replace(m_OutputPath + "/", string.Empty);
FileInfo fileInfo = new FileInfo(file);
int size = (int)(fileInfo.Length / 1024) + 1;
//if (value != "StreamingAssets" && value != "StreamingAssets.manifest")
sw.WriteLine(value + "|" + md5 + "|" + size);
}
sw.Close(); fs.Close(); AB包浏覽器
友善檢視一個ab包内具體包含哪些
黃色的是代表被多個ab包包含的資源
AB異步加載
編輯器下繞過打包模拟加載
if (SimulateAssetBundleInEditor)
{
string[] assetPaths = AssetDatabase.GetAssetPathsFromAssetBundleAndAssetName(assetBundleName, assetName);
if (assetPaths.Length == 0)
{
Debug.LogError("There is no asset with name \"" + assetName + "\" in " + assetBundleName);
return null;
}
// @TODO: Now we only get the main object from the first asset. Should consider type also.
UnityEngine.Object target = AssetDatabase.LoadMainAssetAtPath(assetPaths[0]);
operation = new AssetBundleLoadAssetOperationSimulation (target);
} 異步加載
static public AssetBundleLoadAssetOperation LoadAssetAsync (string assetBundleName, string assetName, System.Type type,string path = "")
{
Log(LogType.Info, "Loading " + assetName + " from " + assetBundleName + " bundle");
AssetBundleLoadAssetOperation operation = null;
{
assetBundleName = RemapVariantName (assetBundleName);
LoadAssetBundle (assetBundleName,false,path);
operation = new AssetBundleLoadAssetOperationFull (assetBundleName, assetName, type);
m_InProgressOperations.Add (operation);
}
return operation;
} - 加載a生成一個AssetBundleLoadOperation，為異步操作加載
public abstract class AssetBundleLoadOperation : IEnumerator
{
public object Current
{
get
{
return null;
}
}
public bool MoveNext()
{
return !IsDone();
}
public void Reset()
{
}
abstract public bool Update ();
abstract public bool IsDone ();
} - 找到a所有依賴ab包（例如b,c）
string[] dependencies = m_AssetBundleManifest.GetAllDependencies(assetBundleName);
if (dependencies.Length == 0)
return;
for (int i=0;i<dependencies.Length;i++)
dependencies[i] = RemapVariantName (dependencies[i]);
// Record and load all dependencies.
m_Dependencies.Add(assetBundleName, dependencies);
for (int i=0;i<dependencies.Length;i++)
LoadAssetBundleInternal(dependencies[i], false,path); - 把b，c加入到m_DownloadingWWWs中，用www加載
- AssetBundleManager中update判斷m_DownloadingWWWs每加載完一項，放入到m_LoadedAssetBundles已加載完ab表中
- 在AssetBundleManager的Update中周遊m_InProgressOperations中每一項AssetBundleLoadOperation，在a的AssetBundleLoadOperation的update中判斷它的依賴b，c是否全部加載完（在m_LoadedAssetBundles中找到值），依賴全加載完，執行加載a的自身ab的請求m_Request = bundle.m_AssetBundle.LoadAssetAsync (m_AssetName, m_Type);
- b，c先加載完，a再加載完，AssetBundleLoadOperation中MoveNext傳回false，代表執行完畢，可以根據ab包執行個體化gameobjec之類
同步加載
static private AssetBundle LoadAssetBundleSync(string abname, string abPath = "")
{
AssetBundle bundle = null;
if (!m_LoadedAssetBundles.ContainsKey(abname))
{
//byte[] stream = null;
string uri;
if (abPath != "")
{
uri = abPath + "/" + abname;
}
else
{
uri = AppConst.AbDataPath + "/" + abname;
}
//Debug.Log("Loading AssetBundle: " + uri);
if (!File.Exists(uri))
{
Debug.LogError(String.Format("AssetBundle {0} Not Found", uri));
return null;
}
//stream = File.ReadAllBytes(uri);
bundle = AssetBundle.LoadFromFile(uri);
//stream = null;
LoadedAssetBundle loBundle = new LoadedAssetBundle(bundle);
m_LoadedAssetBundles.Add(abname, loBundle);
if (m_Dependencies != null && m_Dependencies.ContainsKey(abname))
{
for (int i = 0; i < m_Dependencies[abname].Length; i++)
{
LoadAssetBundleSync(m_Dependencies[abname][i]);
}
}
}
else
{
LoadedAssetBundle loBundle = null;
m_LoadedAssetBundles.TryGetValue(abname, out loBundle);
bundle = loBundle.m_AssetBundle;
}
return bundle;
}