private static void CalculateAssetBundleDependencies(ref BuildCommandSet.Command bundle, Dictionary <GUID, string> assetToBundleMap)
{
var allObjects = new List <ObjectIdentifier>(bundle.assetBundleObjects);
var dependencies = new HashSet <string>();
for (var i = allObjects.Count - 1; i >= 0; --i)
{
// If we are dealing with Unity internal object types, do special handling
if (allObjects[i].type == 0)
{
if (!m_SpriteMap.ContainsKey(allObjects[i].guid))
{
// Remove built in unity objects that are not sprite atlas textures
// IE: shaders, primitives, etc
allObjects.RemoveAt(i);
continue;
}
}
// Check to see if the asset of this object is already explicityly in a bundle
string dependency;
if (!assetToBundleMap.TryGetValue(allObjects[i].guid, out dependency) || dependency == bundle.assetBundleName)
{
continue;
}
dependencies.Add(dependency);
allObjects.RemoveAt(i);
}
bundle.assetBundleObjects = allObjects.ToArray();
bundle.assetBundleDependencies = dependencies.ToArray();
}
private bool ValidateCommand(BuildCommandSet.Command bundle)
{
if (bundle.explicitAssets.IsNullOrEmpty())
{
BuildLogger.LogWarning("Asset bundle '{0}' does not have any explicit assets defined.", bundle.assetBundleName);
}
else
{
foreach (var asset in bundle.explicitAssets)
{
if (string.IsNullOrEmpty(asset.address))
{
BuildLogger.LogWarning("Asset bundle '{0}' has an asset '{1}' with an empty addressable name.", bundle.assetBundleName, asset.asset);
}
if (asset.includedObjects.IsNullOrEmpty() && asset.includedObjects.IsNullOrEmpty())
{
BuildLogger.LogWarning("Asset bundle '{0}' has an asset '{1}' with no objects to load.", bundle.assetBundleName, asset.asset);
}
}
}
if (bundle.assetBundleObjects.IsNullOrEmpty())
{
BuildLogger.LogWarning("Asset bundle '{0}' does not have any serialized objects.", bundle.assetBundleName);
}
else
{
var localIDs = new HashSet <long>();
foreach (var serializedInfo in bundle.assetBundleObjects)
{
if (serializedInfo.serializationIndex == 1)
{
BuildLogger.LogError("Unable to continue resource writing. Asset bundle '{0}' has a serialized object with index of '1'. This is a reserved index and can not be used.",
bundle.assetBundleName);
return(false);
}
if (!localIDs.Add(serializedInfo.serializationIndex))
{
BuildLogger.LogError("Unable to continue resource writing. Asset bundle '{0}' has multiple serialized objects with the same index '{1}'. Each serialized object must have a unique index.",
bundle.assetBundleName, serializedInfo.serializationIndex);
return(false);
}
}
}
return(true);
}
private Hash128 CalculateInputHash(BuildCommandSet.Command command, BuildSettings settings)
{
if (!UseCache)
{
return(new Hash128());
}
// NOTE: correct hash should be based off command, dependencies (internal name), settings, and asset hashes, (and usage tags, NYI)
// NOTE: This hashing method assumes we use a deterministic method to generate all serializationIndex
var dependencies = m_NameToDependencies[command.assetBundleName];
var assetHashes = new List <string>();
foreach (var objectID in command.assetBundleObjects)
{
assetHashes.Add(m_AssetToHash[objectID.serializationObject.guid]);
}
return(HashingMethods.CalculateMD5Hash(Version, command, dependencies, assetHashes, settings));
}
public override BuildPipelineCodes Convert(BuildDependencyInformation buildInfo, out BuildCommandSet output)
{
StartProgressBar("Generating Build Commands", buildInfo.assetLoadInfo.Count);
Hash128 hash = CalculateInputHash(buildInfo);
if (UseCache && BuildCache.TryLoadCachedResults(hash, out output))
{
output = new BuildCommandSet();
EndProgressBar();
return(BuildPipelineCodes.SuccessCached);
}
var commands = new List <BuildCommandSet.Command>();
foreach (var bundle in buildInfo.bundleToAssets)
{
var command = new BuildCommandSet.Command();
var explicitAssets = new List <BuildCommandSet.AssetLoadInfo>();
var assetBundleObjects = new List <BuildCommandSet.SerializationInfo>();
var dependencies = new HashSet <string>();
foreach (var asset in bundle.Value)
{
var assetInfo = buildInfo.assetLoadInfo[asset];
explicitAssets.Add(assetInfo);
if (!UpdateProgressBar(assetInfo.asset))
{
output = new BuildCommandSet();
EndProgressBar();
return(BuildPipelineCodes.Canceled);
}
dependencies.UnionWith(buildInfo.assetToBundles[asset]);
foreach (var includedObject in assetInfo.includedObjects)
{
if (!buildInfo.virtualAssets.Contains(asset) && buildInfo.objectToVirtualAsset.ContainsKey(includedObject))
{
continue;
}
assetBundleObjects.Add(new BuildCommandSet.SerializationInfo
{
serializationObject = includedObject,
serializationIndex = SerializationIndexFromObjectIdentifier(includedObject)
});
}
foreach (var referencedObject in assetInfo.referencedObjects)
{
if (referencedObject.filePath == kUnityDefaultResourcePath)
{
continue;
}
if (buildInfo.objectToVirtualAsset.ContainsKey(referencedObject))
{
continue;
}
if (buildInfo.assetLoadInfo.ContainsKey(referencedObject.guid))
{
continue;
}
assetBundleObjects.Add(new BuildCommandSet.SerializationInfo
{
serializationObject = referencedObject,
serializationIndex = SerializationIndexFromObjectIdentifier(referencedObject)
});
}
BuildUsageTagGlobal globalUsage;
if (buildInfo.sceneUsageTags.TryGetValue(asset, out globalUsage))
{
command.sceneBundle = true;
command.globalUsage |= globalUsage;
}
}
dependencies.Remove(bundle.Key);
assetBundleObjects.Sort(Compare);
command.assetBundleName = bundle.Key;
command.explicitAssets = explicitAssets.ToArray();
command.assetBundleDependencies = dependencies.OrderBy(x => x).ToArray();
command.assetBundleObjects = assetBundleObjects.ToArray();
commands.Add(command);
}
output = new BuildCommandSet();
output.commands = commands.ToArray();
if (UseCache && !BuildCache.SaveCachedResults(hash, output))
{
BuildLogger.LogWarning("Unable to cache CommandSetProcessor results.");
}
if (!EndProgressBar())
{
return(BuildPipelineCodes.Canceled);
}
return(BuildPipelineCodes.Success);
}
public static BuildCommandSet GenerateBuildCommandSet(BuildInput input, BuildSettings settings)
{
// Rebuild sprite atlas cache for correct dependency calculation
Packer.RebuildAtlasCacheIfNeeded(settings.target, true, Packer.Execution.Normal);
// Need to specal case sprites as we only want to include the source texutre in certain situations
m_SpriteMap.Clear();
// Create commands array matching the size of the input
var commandSet = new BuildCommandSet();
commandSet.commands = new BuildCommandSet.Command[input.definitions.Length];
for (var i = 0; i < input.definitions.Length; ++i)
{
var definition = input.definitions[i];
// Populate each command from asset bundle definition
var command = new BuildCommandSet.Command();
command.assetBundleName = definition.assetBundleName;
command.explicitAssets = new BuildCommandSet.AssetLoadInfo[definition.explicitAssets.Length];
// Fill out asset load info and references for each asset in the definition
var allObjects = new HashSet <ObjectIdentifier>();
for (var j = 0; j < definition.explicitAssets.Length; ++j)
{
var explicitAsset = new BuildCommandSet.AssetLoadInfo();
explicitAsset.asset = definition.explicitAssets[j];
explicitAsset.path = AssetDatabase.GUIDToAssetPath(explicitAsset.asset.ToString());
explicitAsset.includedObjects = AssetBundleBuildInterface.GetObjectIdentifiersInAsset(definition.explicitAssets[j]);
explicitAsset.referencedObjects = AssetBundleBuildInterface.GetPlayerDependenciesForObjects(explicitAsset.includedObjects);
// Is this asset a sprite?
var type = AssetDatabase.GetMainAssetTypeAtPath(explicitAsset.path);
if (type == typeof(Texture2D) && explicitAsset.referencedObjects.Length == 1)
{
// Source texture should always be the first included object, atlas should always be the first referenced object
m_SpriteMap[explicitAsset.referencedObjects[0].guid] = new StriteTextures(explicitAsset.includedObjects[0], explicitAsset.referencedObjects[0], command.assetBundleName);
}
command.explicitAssets[j] = explicitAsset;
allObjects.UnionWith(explicitAsset.includedObjects);
allObjects.UnionWith(explicitAsset.referencedObjects);
}
command.assetBundleObjects = allObjects.ToArray();
commandSet.commands[i] = command;
}
// TODO: Debug printing
DebugPrintCommandSet(ref commandSet);
// At this point, We have generated fully self contained asset bundles with 0 dependencies.
// Default implementation is to reduce duplication of objects by declaring dependencies to other asset
// bundles if that other asset bundle has an explicit asset declared that contains the objects needed
// We also remove any built in unity objects as they are built with the player (We may want to change this part in the future)
CalculateAssetBundleBuildDependencies(ref commandSet);
// Note: I may, or may not feel dirty doing mutable things to what otherwise should be immutable struct
// TODO: Debug printing
DebugPrintCommandSet(ref commandSet);
return(commandSet);
}