internal static void SetupIDs(NetworkIdentity identity)
{
var wrapper = new IdentityWrapper(identity);
PrefabStage stage;
if (PrefabUtility.IsPartOfPrefabAsset(identity.gameObject))
{
wrapper.ClearSceneId();
AssignAssetID(identity);
}
// Unity calls OnValidate for prefab and other scene objects based on that prefab
//
// are we modifying THIS prefab, or just a scene object based on the prefab?
// * GetCurrentPrefabStage = 'are we editing ANY prefab?'
// * GetPrefabStage(go) = 'are we editing THIS prefab?'
else if ((stage = PrefabStageUtility.GetCurrentPrefabStage()) != null)
{
// nested if, we want to do nothing if we are not the prefab being edited
if (PrefabStageUtility.GetPrefabStage(identity.gameObject) != null)
{
wrapper.ClearSceneId();
AssignAssetID(identity, GetStagePath(stage));
}
}
else if (SceneObjectWithPrefabParent(identity, out GameObject parent))
{
AssignSceneID(identity);
AssignAssetID(identity, parent);
}
else
{
AssignSceneID(identity);
wrapper.PrefabHash = 0;
}
}
/// <summary>
/// Ensures that a NetworkIdentity has a Random Unique ID
/// </summary>
/// <param name="identity"></param>
/// <remarks>
/// We use a random id here instead of index because the order of `FindObjectOfType` might change if something in the scene changes
/// <para>
/// Id must be assigned at edit time. This is to make sure they are the the same between builds
/// </para>
/// </remarks>
static void AssignSceneID(NetworkIdentity identity)
{
// Only generate at editor time
if (Application.isPlaying)
{
return;
}
var wrapper = new IdentityWrapper(identity);
if (wrapper.SceneId == 0 || IsDuplicate(identity, wrapper.SceneId))
{
// clear in any case, because it might have been a duplicate
wrapper.ClearSceneId();
// Dont generate when building
// this Will Cause a new Random ID for each build
// we need to generate it as edit time
if (BuildPipeline.isBuildingPlayer)
{
throw new InvalidOperationException($"Scene {identity.gameObject.scene.path} needs to be opened and resaved before building, because the scene object {identity.name} has no valid sceneId yet.");
}
int randomId = GetRandomUInt();
// only assign if not a duplicate of an existing scene id (small chance, but possible)
if (!IsDuplicate(identity, randomId))
{
wrapper.SceneId = randomId;
}
}
// Add to dictionary so we can keep track of ID for duplicates
sceneIds[wrapper.SceneId] = identity;
}
