private VariableIntPacker(int smallBits, int mediumBits, int largeBits, bool throwIfOverLarge)
{
this.throwIfOverLarge = throwIfOverLarge;
if (smallBits == 0)
{
throw new ArgumentException("Small value can not be zero", nameof(smallBits));
}
if (smallBits >= mediumBits)
{
throw new ArgumentException("Medium value must be greater than small value", nameof(mediumBits));
}
if (mediumBits >= largeBits)
{
throw new ArgumentException("Large value must be greater than medium value", nameof(largeBits));
}
if (largeBits > 64)
{
throw new ArgumentException("Large bits must be 64 or less", nameof(largeBits));
}
// force medium to also be 62 or less so we can use 1 write call (2 bits to say its medium + 62 value bits
if (mediumBits > 62)
{
throw new ArgumentException("Medium bits must be 62 or less", nameof(mediumBits));
}
this.smallBitCount = smallBits;
this.mediumBitsCount = mediumBits;
this.largeBitsCount = largeBits;
// mask is also max value for n bits
this.smallValue = BitMask.Mask(smallBits);
this.mediumValue = BitMask.Mask(mediumBits);
this.largeValue = BitMask.Mask(largeBits);
}
/// <param name="quaternionBitLength">10 per "smallest 3" is good enough for most people</param>
public QuaternionPacker(int quaternionBitLength = 10)
{
// (this.BitLength - 1) because pack sign by itself
this.bitCountPerElement = quaternionBitLength;
this.totalBitCount = 2 + (quaternionBitLength * 3);
this.floatPacker = new FloatPacker(MaxValue, quaternionBitLength);
this.readMask = (uint)BitMask.Mask(this.bitCountPerElement);
}