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.Contains(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();
}
public static BuildCommandSet GenerateBuildCommandSet(BuildInput input, BuildSettings settings)
{
// 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.GetPlayerObjectIdentifiersInAsset(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.Add(explicitAsset.referencedObjects[0].guid);
}
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);
}