#pragma warning restore 659
#endregion
// Multiply this MoveCubes cube with another MoveCubes cube b, restricted to the corners. Does not change b.
public void CornerMultiply(ICubieCube b)
{
var cPerm = new Corner[8]; //TODO stackalloc
var cOri = new int[8];
var ori = 0;
foreach (var c in Extensions.GetEnumValues <Corner>().Cast <int>())
{
cPerm[c] = _cornerPositions[(int)b.CornerPositions[c]];
var oriA = _cornerOrientations[(int)b.CornerPositions[c]];
var oriB = b.CornerOrientations[c];
if (oriA < 3 && oriB < 3)
{
// two regular cubes
ori = oriA + oriB;
if (ori >= 3)
{
ori -= 3;
}
}
else if (oriA < 3 && 3 <= oriB)
{
// cube b is in a mirrored state
ori = oriA + oriB;
if (ori >= 6)
{
ori -= 3;
}
}
else if (oriA >= 3 && 3 > oriB)
{
// cube a is in a mirrored state
ori = oriA - oriB;
if (ori < 3)
{
ori += 3;
}
}
else if (oriA >= 3 && oriB >= 3)
{
// if both cubes are in mirrored states
ori = oriA - oriB;
if (ori < 0)
{
ori += 3;
}
}
cOri[c] = ori;
}
cPerm.CopyTo(_cornerPositions, 0);
cOri.CopyTo(_cornerOrientations, 0);
}