/// <summary>
/// Play back all recorded operations against an entity manager.
/// </summary>
/// <param name="mgr">The entity manager that will receive the operations</param>
public void Playback(EntityManager mgr)
{
if (mgr == null)
{
throw new NullReferenceException($"{nameof(mgr)} cannot be null");
}
EnforceSingleThreadOwnership();
var head = m_Data->m_Head;
var lastEntity = new Entity();
while (head != null)
{
var off = 0;
var buf = ((byte *)head) + sizeof(Chunk);
while (off < head->Used)
{
var header = (BasicCommand *)(buf + off);
switch ((Command)header->CommandType)
{
case Command.DestroyEntity:
{
mgr.DestroyEntity(((EntityCommand *)header)->Entity);
}
break;
case Command.RemoveComponent:
{
var cmd = (EntityComponentCommand *)header;
var entity = cmd->Header.Entity == Entity.Null ? lastEntity : cmd->Header.Entity;
mgr.RemoveComponent(entity, TypeManager.GetType(cmd->ComponentTypeIndex));
}
break;
case Command.CreateEntity:
{
var cmd = (CreateCommand *)header;
if (cmd->Archetype.Valid)
{
lastEntity = mgr.CreateEntity(cmd->Archetype);
}
else
{
lastEntity = mgr.CreateEntity();
}
break;
}
case Command.AddComponent:
{
var cmd = (EntityComponentCommand *)header;
var componentType = (ComponentType)TypeManager.GetType(cmd->ComponentTypeIndex);
var entity = cmd->Header.Entity == Entity.Null ? lastEntity : cmd->Header.Entity;
mgr.AddComponent(entity, componentType);
mgr.SetComponentDataRaw(entity, cmd->ComponentTypeIndex, (cmd + 1), cmd->ComponentSize);
}
break;
case Command.SetComponent:
{
var cmd = (EntityComponentCommand *)header;
var entity = cmd->Header.Entity == Entity.Null ? lastEntity : cmd->Header.Entity;
mgr.SetComponentDataRaw(entity, cmd->ComponentTypeIndex, (cmd + 1), cmd->ComponentSize);
}
break;
case Command.AddSharedComponentData:
{
var cmd = (EntitySharedComponentCommand *)header;
var entity = cmd->Header.Entity == Entity.Null ? lastEntity : cmd->Header.Entity;
mgr.AddSharedComponentDataBoxed(entity, cmd->ComponentTypeIndex, cmd->HashCode, cmd->GetBoxedObject());
}
break;
case Command.SetSharedComponentData:
{
var cmd = (EntitySharedComponentCommand *)header;
var entity = cmd->Header.Entity == Entity.Null ? lastEntity : cmd->Header.Entity;
mgr.SetSharedComponentDataBoxed(entity, cmd->ComponentTypeIndex, cmd->HashCode, cmd->GetBoxedObject());
}
break;
}
off += header->TotalSize;
}
head = head->Next;
}
}
