[Unity Asset]AssetBundle系列——游戏资源打包
浏览数：143 /
时间：2015年06月08日
转载:http://www.cnblogs.com/sifenkesi/p/3557231.html
将本地资源打包，然后放到资源服务器上供游戏客户端下载或更新。服务器上包含以下资源列表：
(1)游戏内容资源assetbundle
(2)资源维护列表，包含每个资源的名字(完整路径名)和对应的版本号[资源名，版本号]，如下表所示（VersionNum.xml）:
<VersionNum> <File FileName="Assets.Resources.BigLevelTexture.TestLevel.assetbundle" Num="1" /> <File FileName="Assets.Resources.EquipmentTexture.Test001.assetbundle" Num="1" /> <File FileName="Assets.Resources.EquipmentTexture.Test002.assetbundle" Num="1" /> <File FileName="Assets.Resources.EquipmentTexture.Test003.assetbundle" Num="1" /> <File FileName="Assets.Resources.EquipmentTexture.Test004.assetbundle" Num="1" /> <File FileName="Assets.Resources.PetTexture.Empty.assetbundle" Num="1" /> </VersionNum>
那么本地客户端的资源打包编辑器就需要完成以下工作：将资源打包、生成版本号。
我们采用通过MD5码对比的方式来对版本号进行管理，如果某资源的MD5码变更了，则将其版本号+1，否则不变。那么，可以将编辑器的具体任务划分如下：
(1)将资源打包成assetbundle，并放到指定目录下
(2)为每个assetbund生成最新MD5码，用于检查资源是否有修改
(3)比较新旧MD5码列表，产生资源变更列表，对于每个变更的资源，将其版本号+1
(4)将变更列表文件也打包成assetbundle
各个平台使用的资源包时各自独立的，打包资源代码时的选项不一样，编辑器界面如下，图2中的4个按钮每个对应上述的一步操作：
最终生成的资源目录结构如下所示：
编辑器代码如下所示（包括菜单项和窗口）：
using UnityEditor;
using UnityEngine;
using System.IO;
using System.Collections;
using System.Collections.Generic;
public class AssetBundleController : EditorWindow
{
public static AssetBundleController window;
public static UnityEditor.BuildTarget buildTarget = BuildTarget.StandaloneWindows;
[MenuItem("XiYouEditor/AssetBundle/AssetBundle For Windows32", false, 1)]
public static void ExecuteWindows32()
{
if (window == null)
{
window = (AssetBundleController)GetWindow(typeof(AssetBundleController));
}
buildTarget = UnityEditor.BuildTarget.StandaloneWindows;
window.Show();
}
[MenuItem("XiYouEditor/AssetBundle/AssetBundle For IPhone", false, 2)]
public static void ExecuteIPhone()
{
if (window == null)
{
window = (AssetBundleController)GetWindow(typeof(AssetBundleController));
}
buildTarget = UnityEditor.BuildTarget.iPhone;
window.Show();
}
[MenuItem("XiYouEditor/AssetBundle/AssetBundle For Mac", false, 3)]
public static void ExecuteMac()
{
if (window == null)
{
window = (AssetBundleController)GetWindow(typeof(AssetBundleController));
}
buildTarget = UnityEditor.BuildTarget.StandaloneOSXUniversal;
window.Show();
}
[MenuItem("XiYouEditor/AssetBundle/AssetBundle For Android", false, 4)]
public static void ExecuteAndroid()
{
if (window == null)
{
window = (AssetBundleController)GetWindow(typeof(AssetBundleController));
}
buildTarget = UnityEditor.BuildTarget.Android;
window.Show();
}
[MenuItem("XiYouEditor/AssetBundle/AssetBundle For WebPlayer", false, 5)]
public static void ExecuteWebPlayer()
{
if (window == null)
{
window = (AssetBundleController)GetWindow(typeof(AssetBundleController));
}
buildTarget = UnityEditor.BuildTarget.WebPlayer;
window.Show();
}
void OnGUI()
{
if (GUI.Button(new Rect(10f, 10f, 200f, 50f), "(1)CreateAssetBundle"))
{
CreateAssetBundle.Execute(buildTarget);
EditorUtility.DisplayDialog("", "Step (1) Completed", "OK");
}
if (GUI.Button(new Rect(10f, 80f, 200f, 50f), "(2)Generate MD5"))
{
CreateMD5List.Execute(buildTarget);
EditorUtility.DisplayDialog("", "Step (2) Completed", "OK");
}
if (GUI.Button(new Rect(10f, 150f, 200f, 50f), "(3)Compare MD5"))
{
CampareMD5ToGenerateVersionNum.Execute(buildTarget);
EditorUtility.DisplayDialog("", "Step (3) Completed", "OK");
}
if (GUI.Button(new Rect(10f, 220f, 200f, 50f), "(4)Build VersionNum.xml"))
{
CreateAssetBundleForXmlVersion.Execute(buildTarget);
EditorUtility.DisplayDialog("", "Step (4) Completed", "OK");
}
}
public static string GetPlatformPath(UnityEditor.BuildTarget target)
{
string SavePath = "";
switch (target)
{
case BuildTarget.StandaloneWindows:
SavePath = "Assets/AssetBundle/Windows32/";
break;
case BuildTarget.StandaloneWindows64:
SavePath = "Assets/AssetBundle/Windows64/";
break;
case BuildTarget.iPhone:
SavePath = "Assets/AssetBundle/IOS/";
break;
case BuildTarget.StandaloneOSXUniversal:
SavePath = "Assets/AssetBundle/Mac/";
break;
case BuildTarget.Android:
SavePath = "Assets/AssetBundle/Android/";
break;
case BuildTarget.WebPlayer:
SavePath = "Assets/AssetBundle/WebPlayer/";
break;
default:
SavePath = "Assets/AssetBundle/";
break;
}
if (Directory.Exists(SavePath) == false)
Directory.CreateDirectory(SavePath);
return SavePath;
}
public static string GetPlatformName(UnityEditor.BuildTarget target)
{
string platform = "Windows32";
switch (target)
{
case BuildTarget.StandaloneWindows:
platform = "Windows32";
break;
case BuildTarget.StandaloneWindows64:
platform = "Windows64";
break;
case BuildTarget.iPhone:
platform = "IOS";
break;
case BuildTarget.StandaloneOSXUniversal:
platform = "Mac";
break;
case BuildTarget.Android:
platform = "Android";
break;
case BuildTarget.WebPlayer:
platform = "WebPlayer";
break;
default:
break;
}
return platform;
}
}
(1)将资源打包成assetbundle，并放到自定目录下:
using UnityEditor;
using UnityEngine;
using System.IO;
using System.Collections;
using System.Collections.Generic;
public class CreateAssetBundle
{
public static void Execute(UnityEditor.BuildTarget target)
{
string SavePath = AssetBundleController.GetPlatformPath(target);
// 当前选中的资源列表
foreach (Object o in Selection.GetFiltered(typeof(Object), SelectionMode.DeepAssets))
{
string path = AssetDatabase.GetAssetPath(o);
// 过滤掉meta文件和文件夹
if(path.Contains(".meta") || path.Contains(".") == false)
continue;
// 过滤掉UIAtlas目录下的贴图和材质(UI/Common目录下的所有资源都是UIAtlas)
if (path.Contains("UI/Common"))
{
if ((o is Texture) || (o is Material))
continue;
}
path = SavePath + ConvertToAssetBundleName(path);
path = path.Substring(0, path.LastIndexOf(‘.‘));
path += ".assetbundle";
BuildPipeline.BuildAssetBundle(o, null, path, BuildAssetBundleOptions.CollectDependencies | BuildAssetBundleOptions.CompleteAssets | BuildAssetBundleOptions.DeterministicAssetBundle, target);
}
// scene目录下的资源
AssetDatabase.Refresh();
}
static string ConvertToAssetBundleName(string ResName)
{
return ResName.Replace(‘/‘, ‘.‘);
}
}
(2)为每个assetbund生成MD5码，用于检查资源是否有修改
using UnityEngine;
using UnityEditor;
using System.IO;
using System.Xml;
using System.Collections;
using System.Collections.Generic;
using System.Security.Cryptography;
public class CreateMD5List
{
public static void Execute(UnityEditor.BuildTarget target)
{
string platform = AssetBundleController.GetPlatformName(target);
Execute(platform);
AssetDatabase.Refresh();
}
public static void Execute(string platform)
{
Dictionary<string, string> DicFileMD5 = new Dictionary<string, string>();
MD5CryptoServiceProvider md5Generator = new MD5CryptoServiceProvider();
string dir = System.IO.Path.Combine(Application.dataPath, "AssetBundle/" + platform);
foreach (string filePath in Directory.GetFiles(dir))
{
if (filePath.Contains(".meta") || filePath.Contains("VersionMD5") || filePath.Contains(".xml"))
continue;
FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
byte[] hash = md5Generator.ComputeHash(file);
string strMD5 = System.BitConverter.ToString(hash);
file.Close();
string key = filePath.Substring(dir.Length + 1, filePath.Length - dir.Length - 1);
if (DicFileMD5.ContainsKey(key) == false)
DicFileMD5.Add(key, strMD5);
else
Debug.LogWarning("<Two File has the same name> name = " + filePath);
}
string savePath = System.IO.Path.Combine(Application.dataPath, "AssetBundle/") + platform + "/VersionNum";
if (Directory.Exists(savePath) == false)
Directory.CreateDirectory(savePath);
// 删除前一版的old数据
if (File.Exists(savePath + "/VersionMD5-old.xml"))
{
System.IO.File.Delete(savePath + "/VersionMD5-old.xml");
}
// 如果之前的版本存在，则将其名字改为VersionMD5-old.xml
if (File.Exists(savePath + "/VersionMD5.xml"))
{
System.IO.File.Move(savePath + "/VersionMD5.xml", savePath + "/VersionMD5-old.xml");
}
XmlDocument XmlDoc = new XmlDocument();
XmlElement XmlRoot = XmlDoc.CreateElement("Files");
XmlDoc.AppendChild(XmlRoot);
foreach (KeyValuePair<string, string> pair in DicFileMD5)
{
XmlElement xmlElem = XmlDoc.CreateElement("File");
XmlRoot.AppendChild(xmlElem);
xmlElem.SetAttribute("FileName", pair.Key);
xmlElem.SetAttribute("MD5", pair.Value);
}
// 读取旧版本的MD5
Dictionary<string, string> dicOldMD5 = ReadMD5File(savePath + "/VersionMD5-old.xml");
// VersionMD5-old中有，而VersionMD5中没有的信息，手动添加到VersionMD5
foreach (KeyValuePair<string, string> pair in dicOldMD5)
{
if (DicFileMD5.ContainsKey(pair.Key) == false)
DicFileMD5.Add(pair.Key, pair.Value);
}
XmlDoc.Save(savePath + "/VersionMD5.xml");
XmlDoc = null;
}
static Dictionary<string, string> ReadMD5File(string fileName)
{
Dictionary<string, string> DicMD5 = new Dictionary<string, string>();
// 如果文件不存在，则直接返回
if (System.IO.File.Exists(fileName) == false)
return DicMD5;
XmlDocument XmlDoc = new XmlDocument();
XmlDoc.Load(fileName);
XmlElement XmlRoot = XmlDoc.DocumentElement;
foreach (XmlNode node in XmlRoot.ChildNodes)
{
if ((node is XmlElement) == false)
continue;
string file = (node as XmlElement).GetAttribute("FileName");
string md5 = (node as XmlElement).GetAttribute("MD5");
if (DicMD5.ContainsKey(file) == false)
{
DicMD5.Add(file, md5);
}
}
XmlRoot = null;
XmlDoc = null;
return DicMD5;
}
}
MD5列表如下所示：
<Files> <File FileName="Assets.Resources.BigLevelTexture.TestLevel.assetbundle" MD5="54-00-42-38-D5-86-43-A6-57-9D-7C-09-3A-F8-6E-10" /> <File FileName="Assets.Resources.EquipmentTexture.Test001.assetbundle" MD5="A1-19-D4-04-17-94-18-61-60-99-35-25-3F-7C-39-93" /> <File FileName="Assets.Resources.EquipmentTexture.Test002.assetbundle" MD5="CF-36-DA-C8-D2-DB-CE-FD-4A-BF-31-81-A1-D1-D2-21" /> <File FileName="Assets.Resources.EquipmentTexture.Test003.assetbundle" MD5="EF-30-78-AE-F8-F4-A0-EC-5B-4E-45-3F-1E-EF-42-44" /> <File FileName="Assets.Resources.EquipmentTexture.Test004.assetbundle" MD5="3D-5D-A7-01-D2-B1-20-5F-B9-89-C5-CB-40-96-EC-89" /> <File FileName="Assets.Resources.PetTexture.Empty.assetbundle" MD5="D9-AC-54-F8-EB-AA-1C-36-8C-2B-6C-12-37-AB-3B-48" /> </Files>
(3)比较新旧MD5码，生成资源变更列表
using UnityEngine;
using UnityEditor;
using System.IO;
using System.Xml;
using System.Collections;
using System.Collections.Generic;
public class CampareMD5ToGenerateVersionNum
{
public static void Execute(UnityEditor.BuildTarget target)
{
string platform = AssetBundleController.GetPlatformName(target);
Execute(platform);
AssetDatabase.Refresh();
}
// 对比对应版本目录下的VersionMD5和VersionMD5-old，得到最新的版本号文件VersionNum.xml
public static void Execute(string platform)
{
// 读取新旧MD5列表
string newVersionMD5 = System.IO.Path.Combine(Application.dataPath, "AssetBundle/" + platform + "/VersionNum/VersionMD5.xml");
string oldVersionMD5 = System.IO.Path.Combine(Application.dataPath, "AssetBundle/" + platform + "/VersionNum/VersionMD5-old.xml");
Dictionary<string, string> dicNewMD5Info = ReadMD5File(newVersionMD5);
Dictionary<string, string> dicOldMD5Info = ReadMD5File(oldVersionMD5);
// 读取版本号记录文件VersinNum.xml
string oldVersionNum = System.IO.Path.Combine(Application.dataPath, "AssetBundle/" + platform + "/VersionNum/VersionNum.xml");
Dictionary<string, int> dicVersionNumInfo = ReadVersionNumFile(oldVersionNum);
// 对比新旧MD5信息，并更新版本号，即对比dicNewMD5Info&&dicOldMD5Info来更新dicVersionNumInfo
foreach (KeyValuePair<string, string> newPair in dicNewMD5Info)
{
// 旧版本中有
if (dicOldMD5Info.ContainsKey(newPair.Key))
{
// MD5一样，则不变
// MD5不一样，则+1
// 容错：如果新旧MD5都有，但是还没有版本号记录的，则直接添加新纪录，并且将版本号设为1
if (dicVersionNumInfo.ContainsKey(newPair.Key) == false)
{
dicVersionNumInfo.Add(newPair.Key, 1);
}
else if (newPair.Value != dicOldMD5Info[newPair.Key])
{
int num = dicVersionNumInfo[newPair.Key];
dicVersionNumInfo[newPair.Key] = num + 1;
}
}
else // 旧版本中没有，则添加新纪录，并=1
{
dicVersionNumInfo.Add(newPair.Key, 1);
}
}
// 不可能出现旧版本中有，而新版本中没有的情况，原因见生成MD5List的处理逻辑
// 存储最新的VersionNum.xml
SaveVersionNumFile(dicVersionNumInfo, oldVersionNum);
}
static Dictionary<string, string> ReadMD5File(string fileName)
{
Dictionary<string, string> DicMD5 = new Dictionary<string, string>();
// 如果文件不存在，则直接返回
if (System.IO.File.Exists(fileName) == false)
return DicMD5;
XmlDocument XmlDoc = new XmlDocument();
XmlDoc.Load(fileName);
XmlElement XmlRoot = XmlDoc.DocumentElement;
foreach (XmlNode node in XmlRoot.ChildNodes)
{
if ((node is XmlElement) == false)
continue;
string file = (node as XmlElement).GetAttribute("FileName");
string md5 = (node as XmlElement).GetAttribute("MD5");
if (DicMD5.ContainsKey(file) == false)
{
DicMD5.Add(file, md5);
}
}
XmlRoot = null;
XmlDoc = null;
return DicMD5;
}
static Dictionary<string, int> ReadVersionNumFile(string fileName)
{
Dictionary<string, int> DicVersionNum = new Dictionary<string, int>();
// 如果文件不存在，则直接返回
if (System.IO.File.Exists(fileName) == false)
return DicVersionNum;
XmlDocument XmlDoc = new XmlDocument();
XmlDoc.Load(fileName);
XmlElement XmlRoot = XmlDoc.DocumentElement;
foreach (XmlNode node in XmlRoot.ChildNodes)
{
if ((node is XmlElement) == false)
continue;
string file = (node as XmlElement).GetAttribute("FileName");
int num = XmlConvert.ToInt32((node as XmlElement).GetAttribute("Num"));
if (DicVersionNum.ContainsKey(file) == false)
{
DicVersionNum.Add(file, num);
}
}
XmlRoot = null;
XmlDoc = null;
return DicVersionNum;
}
static void SaveVersionNumFile(Dictionary<string, int> data, string savePath)
{
XmlDocument XmlDoc = new XmlDocument();
XmlElement XmlRoot = XmlDoc.CreateElement("VersionNum");
XmlDoc.AppendChild(XmlRoot);
foreach (KeyValuePair<string, int> pair in data)
{
XmlElement xmlElem = XmlDoc.CreateElement("File");
XmlRoot.AppendChild(xmlElem);
xmlElem.SetAttribute("FileName", pair.Key);
xmlElem.SetAttribute("Num", XmlConvert.ToString(pair.Value));
}
XmlDoc.Save(savePath);
XmlRoot = null;
XmlDoc = null;
}
}
如下图所示，根据VersionMD5.xml和VersionMD5-old.xml对比产生VersionNum.xml：
(4)将变更列表文件也打包成assetbundle
也就是讲VersionNum.xml打包后供下载：
using UnityEditor;
using UnityEngine;
using System.IO;
using System.Collections;
using System.Collections.Generic;
public class CreateAssetBundleForXmlVersion
{
public static void Execute(UnityEditor.BuildTarget target)
{
string SavePath = AssetBundleController.GetPlatformPath(target);
Object obj = AssetDatabase.LoadAssetAtPath(SavePath + "VersionNum/VersionNum.xml", typeof(Object));
BuildPipeline.BuildAssetBundle(obj, null, SavePath + "VersionNum/VersionNum.assetbundle", BuildAssetBundleOptions.CollectDependencies | BuildAssetBundleOptions.CompleteAssets | BuildAssetBundleOptions.DeterministicAssetBundle, target);
AssetDatabase.Refresh();
}
static string ConvertToAssetBundleName(string ResName)
{
return ResName.Replace(‘/‘, ‘.‘);
}
}
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