/// <summary>Gets the bit-register for the specified entity system.</summary>
/// <param name="entitySystem">The entity system.</param>
/// <returns>The bit flag register for the specified system.</returns>
public static BigInteger GetBitFor(EntitySystem entitySystem)
{
BigInteger bit;
if (SystemBits.TryGetValue(entitySystem, out bit) == false)
{
#if WINDOWS_PHONE || XBOX || PORTABLE
bit = 1 << position;
#else
bit = 1L << position;
#endif
++position;
SystemBits.Add(entitySystem, bit);
}
return bit;
}
/// <summary>Gets the bit-register for the specified entity system.</summary>
/// <param name="entitySystem">The entity system.</param>
/// <returns>The bit flag register for the specified system.</returns>
public BigInteger GetBitFor(EntitySystem entitySystem)
{
BigInteger bit;
if (this.systemBits.TryGetValue(entitySystem, out bit) == false)
{
#if WINDOWS_PHONE || XBOX || PORTABLE || FORCEINT32
if (this.position == 32)
{
// bit is going to overflow and become 1 again
throw new InvalidOperationException("EntitySystem instances limit reached: number of EntitySystem instances is restricted to 32 in the current Artemis build.");
}
bit = 1 << this.position;
#else
bit = 1L << this.position;
#endif
this.position++;
this.systemBits.Add(entitySystem, bit);
}
return bit;
}
/// <summary>Initializes a new instance of the <see cref="EntityProcessingSystem"/> class.</summary>
/// <param name="requiredType">The required Type.</param>
/// <param name="otherTypes">The optional other types.</param>
protected EntityProcessingSystem(Type requiredType, params Type[] otherTypes)
: base(EntitySystem.GetMergedTypes(requiredType, otherTypes))
{
}