/// <summary>
/// Register the given entity prototype class.
/// </summary>
/// <param name="entityComponentType">Entity class prototype.</param>
internal static void TryRegister(Type entityComponentType)
{
if (!entityComponentType.IsAbstract && !entityComponentType.IsValueType && entityComponentType.GetConstructor(Type.EmptyTypes) == null)
{
string errorMessage = string.Format("Unable to register component of type {0}!{2}" +
"The component doesn't have a default parameterless constructor defined which is not supported on classes inheriting from {1}." +
"The {1} will overwrite the values of the constructor with the serialized values of the component." +
"Use {3} instead to initialize your component.",
entityComponentType.FullName, nameof(EntityComponent), Environment.NewLine, nameof(EntityComponent.OnInitialize));
throw new NotSupportedException(errorMessage);
}
var typeInfo = new TypeInfo
{
type = entityComponentType
};
_componentTypes.Add(typeInfo);
var guidAttribute = (GuidAttribute)entityComponentType.GetCustomAttributes(typeof(GuidAttribute), false).FirstOrDefault();
if (guidAttribute != null)
{
var guid = new Guid(guidAttribute.Value);
var guidArray = guid.ToByteArray();
typeInfo.guid.hipart = BitConverter.ToUInt64(guidArray, 0);
typeInfo.guid.lopart = BitConverter.ToUInt64(guidArray, 8);
}
else
{
// Fall back to generating GUID based on type
var guidString = Engine.TypeToHash(entityComponentType);
var half = (int)(guidString.Length / 2.0f);
if (!ulong.TryParse(guidString.Substring(0, half), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out typeInfo.guid.hipart))
{
Log.Error("Failed to parse {0} to UInt64", guidString.Substring(0, half));
}
if (!ulong.TryParse(guidString.Substring(half, guidString.Length - half), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out typeInfo.guid.lopart))
{
Log.Error("Failed to parse {0} to UInt64", guidString.Substring(half, guidString.Length - half));
}
}
var componentAttribute = (EntityComponentAttribute)entityComponentType.GetCustomAttributes(typeof(EntityComponentAttribute), false).FirstOrDefault();
if (componentAttribute == null)
{
componentAttribute = new EntityComponentAttribute();
}
if (componentAttribute.Name.Length == 0)
{
componentAttribute.Name = entityComponentType.Name;
}
if (entityComponentType.IsAbstract || entityComponentType.IsInterface)
{
// By passing an empty string as the name the component will still be registered,
// but the Sandbox will not show it in the AddComponent menu.
componentAttribute.Name = string.Empty;
}
NativeInternals.Entity.RegisterComponent(entityComponentType,
typeInfo.guid.hipart,
typeInfo.guid.lopart,
componentAttribute.Name,
componentAttribute.Category,
componentAttribute.Description,
componentAttribute.Icon);
// Register all bases, note that the base has to have been registered before the component we're registering right now!
var baseType = entityComponentType.BaseType;
while (baseType != typeof(object))
{
NativeInternals.Entity.AddComponentBase(entityComponentType, baseType);
baseType = baseType.BaseType;
}
if (!entityComponentType.IsAbstract)
{
RegisterComponentProperties(entityComponentType);
}
}