public static void Initialize()
{
if (s_Types != null)
{
return;
}
ObjectOffset = UnsafeUtility.SizeOf <ObjectOffsetType>();
s_CreateTypeLock = new SpinLock();
s_Types = new ComponentType[MaximumTypesCount];
s_Count = 0;
s_Types[s_Count++] = new ComponentType(null, 0, TypeCategory.ComponentData, null, null, 0);
// This must always be first so that Entity is always index 0 in the archetype
s_Types[s_Count++] = new ComponentType(typeof(Entity), sizeof(Entity), TypeCategory.EntityData,
FastEquality.CreateLayout(typeof(Entity)), EntityRemapUtility.CalculateEntityOffsets(typeof(Entity)), 0);
}
private static ComponentType BuildComponentType(Type type)
{
var componentSize = 0;
TypeCategory category;
FastEquality.Layout[] fastEqualityLayout = null;
EntityOffsetInfo[] entityOffsets = null;
var memoryOrdering = CalculateMemoryOrdering(type);
if (typeof(IComponentData).IsAssignableFrom(type))
{
#if ENABLE_UNITY_COLLECTIONS_CHECKS
if (type.IsClass)
{
throw new ArgumentException($"{type} is an IComponentData, and thus must be a struct.");
}
if (!UnsafeUtility.IsBlittable(type))
{
throw new ArgumentException(
$"{type} is an IComponentData, and thus must be blittable (No managed object is allowed on the struct).");
}
#endif
category = TypeCategory.ComponentData;
componentSize = UnsafeUtility.SizeOf(type);
fastEqualityLayout = FastEquality.CreateLayout(type);
entityOffsets = EntityRemapUtility.CalculateEntityOffsets(type);
}
else if (typeof(ISharedComponentData).IsAssignableFrom(type))
{
#if ENABLE_UNITY_COLLECTIONS_CHECKS
if (type.IsClass)
{
throw new ArgumentException($"{type} is an ISharedComponentData, and thus must be a struct.");
}
#endif
category = TypeCategory.ISharedComponentData;
fastEqualityLayout = FastEquality.CreateLayout(type);
}
else if (type.IsValueType)
{
#if ENABLE_UNITY_COLLECTIONS_CHECKS
if (!UnsafeUtility.IsBlittable(type))
{
throw new ArgumentException($"{type} is used for FixedArrays, and thus must be blittable.");
}
#endif
category = TypeCategory.OtherValueType;
componentSize = UnsafeUtility.SizeOf(type);
}
else if (type.IsClass)
{
category = TypeCategory.Class;
#if ENABLE_UNITY_COLLECTIONS_CHECKS
if (type.FullName == "Unity.Entities.GameObjectEntity")
{
throw new ArgumentException(
"GameObjectEntity can not be used from EntityManager. The component is ignored when creating entities for a GameObject.");
}
#endif
}
#if ENABLE_UNITY_COLLECTIONS_CHECKS
else
{
throw new ArgumentException($"'{type}' is not a valid component");
}