[游戏开发][Unity]Assetbundle打包篇（3）打包资源收集_unity 资源打包 api

目录

打包与资源加载框架目录

前言

本篇文章是整个打包的核心，我们需要告诉打包API打包目标是什么，在整理目标的时候，可以定制化各种各样的收集策略，以及剔除策略、引用策略等。

正文开始

首先要明确，我们的最终目标是收集打包资源。但请注意，该步骤收集的不是最终调用打包接口的参数2。而是包含了我们自己自己需要的一些信息，当然，其中包含了参数2需要的信息。

AssetBundleManifest.BuildAssetBundles(string outputPath, AssetBundleBuild[] builds, BuildAssetBundleOptions assetBundleOptions, BuildTarget targetPlatform);

下面是收集资源的代码，非常重要！！！仔细看，多看，该方法的返回值是List<AssetInfo>

private List<AssetInfo> GetBuildMap()
{
    int progressBarCount = 0;
    Dictionary<string, AssetInfo> allAsset = new Dictionary<string, AssetInfo>();
 
    // 获取所有的收集路径，该方法在上一篇文章里有代码
    List<string> collectPathList = CollectionSettingData.GetAllCollectPath();
    if (collectPathList.Count == 0)
        throw new Exception("[BuildPatch] 配置的打包路径列表为空");
 
    // 获取所有资源
    string[] guids = AssetDatabase.FindAssets(string.Empty, collectPathList.ToArray());
    foreach (string guid in guids)
    {
        string mainAssetPath = AssetDatabase.GUIDToAssetPath(guid);
        if (CollectionSettingData.IsIgnoreAsset(mainAssetPath))
            continue;
        if (ValidateAsset(mainAssetPath) == false)
            continue;
 
        List<AssetInfo> depends = GetDependencies(mainAssetPath);
        for (int i = 0; i < depends.Count; i++)
        {
            AssetInfo assetInfo = depends[i];
            if (assetInfo.AssetPath.Contains("Activity.RU"))
            {
                throw new Exception($"[BuildPatch] Contain: {assetInfo.AssetPath} by {mainAssetPath}");
            }
 
            if (allAsset.ContainsKey(assetInfo.AssetPath))
            {
                AssetInfo cacheInfo = allAsset[assetInfo.AssetPath];
                cacheInfo.DependCount++;
            }
            else
            {
                allAsset.Add(assetInfo.AssetPath, assetInfo);
            }
        }
 
        // 进度条
        progressBarCount++;
        EditorUtility.DisplayProgressBar("进度", $"依赖文件分析：{progressBarCount}/{guids.Length}", (float)progressBarCount / guids.Length);
    }
    EditorUtility.ClearProgressBar();
    progressBarCount = 0;
 
    // 移除零依赖的资源
    List<string> removeList = new List<string>();
    foreach (KeyValuePair<string, AssetInfo> pair in allAsset)
    {
        if (pair.Value.IsCollectAsset)
            continue;
        if (pair.Value.DependCount == 0)
            removeList.Add(pair.Value.AssetPath);
        else if (pair.Value.AssetPath.ToLower().Contains("assets/worksart/panel/atlas/"))
            removeList.Add(pair.Value.AssetPath);
    }
    for (int i = 0; i < removeList.Count; i++)
    {
        allAsset.Remove(removeList[i]);
    }
 
    // 设置AssetBundleLabel资源标签
    foreach (KeyValuePair<string, AssetInfo> pair in allAsset)
    {
        SetAssetBundleLabelAndVariant(pair.Value);
        SetAssetEncrypt(pair.Value);
        // 进度条
        progressBarCount++;
        EditorUtility.DisplayProgressBar("进度", $"设置资源标签：{progressBarCount}/{allAsset.Count}", (float)progressBarCount / allAsset.Count);
    }
    EditorUtility.ClearProgressBar();
    progressBarCount = 0;
 
    // Dictionary<string, long> dicSortedBySize = allAsset.OrderBy(o => o.Value.sizeKB).ToDictionary(p => p.Key, o => o.Value.sizeKB);
    // foreach (KeyValuePair<string, long> pair in dicSortedBySize)
    // {
    //     Log($"AB asset: {pair.Key}, sizeKB： {pair.Value}");
    // }
 
    // 返回结果
    return allAsset.Values.ToList();
}

下面是获取所有依赖的方法

private List<AssetInfo> GetDependencies(string assetPath)
        {
            List<AssetInfo> depends = new List<AssetInfo>();
            string[] dependArray = AssetDatabase.GetDependencies(assetPath, true);
            foreach (string dependPath in dependArray)
            {
                if (ValidateAsset(dependPath))
                {
                    AssetInfo assetInfo = new AssetInfo(dependPath);
                    depends.Add(assetInfo);
                }
            }
            return depends;
        }

下面是设置AssetBundleLabel的方法，请注意，CollectionSettingData.GetAssetBundleLabel在上一篇文章中有代码

variant变量就是ab包的后缀，一般.unity3d

还有一点非常重要，ab包的名字除了可以使用字符串，还可以使用MD5码

private void SetAssetBundleLabelAndVariant(AssetInfo assetInfo)
        {
            string label = CollectionSettingData.GetAssetBundleLabel(assetInfo.AssetPath);
            string variant = VariantCollector.GetVariantByAssetPath(label);
            if (string.IsNullOrEmpty(variant))
            {
                variant = PatchDefine.AssetBundleDefaultVariant;
            }
            else
            {
                label = label.Replace(variant, "");
                variant = variant.Substring(1);
            }
            if (IsNameByHash)
                assetInfo.AssetBundleLabel = HashUtility.BytesMD5(Encoding.UTF8.GetBytes(label));
            else
                assetInfo.AssetBundleLabel = label;
 
            assetInfo.ReadableLabel = label;
            assetInfo.AssetBundleVariant = variant;
            assetInfo.bundlePos = CollectionSettingData.GetAssetBundlePos(assetInfo.AssetPath);
            // assetInfo.sizeKB = EditorTools.GetFileSize(assetInfo.AssetPath);
        }

下面是AssetInfo的代码

    public class AssetInfo
    {
        public string AssetPath { private set; get; }
        public bool IsCollectAsset { private set; get; }
        public bool IsSceneAsset { private set; get; }
        public bool IsVideoAsset { private set; get; }
        
        /// <summary>
        /// 被依赖次数
        /// </summary>
        public int DependCount = 0;
 
        /// <summary>
        /// AssetBundle标签
        /// </summary>
        public string AssetBundleLabel = null;
 
        /// <summary>
        /// AssetBundle变体
        /// </summary>
        public string AssetBundleVariant = null;
 
        /// <summary>
        /// AssetBundle存放位置
        /// </summary>
        public EBundlePos bundlePos = EBundlePos.buildin;
 
        public string ReadableLabel = "undefined";
 
        public EEncryptMethod EncryptMethod;
 
        public AssetInfo(string assetPath)
        {
            AssetPath = assetPath;
            IsCollectAsset = CollectionSettingData.IsCollectAsset(assetPath);
            IsSceneAsset = AssetDatabase.GetMainAssetTypeAtPath(assetPath) == typeof(SceneAsset);
            IsVideoAsset = AssetDatabase.GetMainAssetTypeAtPath(assetPath) == typeof(UnityEngine.Video.VideoClip);
        }
    }