static PawnStructureEvaluator()
{
_innerFileMasks = new ulong[8];
_outerFileMasks = new ulong[8];
_chainMasks = new ulong[64];
for (var i = 0; i < 8; i++)
{
_innerFileMasks[i] = BoardConstants.AFile >> i;
if (i - 1 >= 0)
{
_outerFileMasks[i] |= BoardConstants.AFile >> (i - 1);
}
if (i + 1 < 8)
{
_outerFileMasks[i] |= BoardConstants.AFile >> (i + 1);
}
}
for (var i = 0; i < 64; i++)
{
_chainMasks[i] = DiagonalPatternGenerator.GetPattern(i) & BoxPatternGenerator.GetPattern(i);
}
}
public static MagicContainer[] GenerateBishopAttacks(ulong[] keys = null)
{
var masks = new ulong[64];
var permutations = new ulong[64][];
var attacks = new ulong[64][];
for (var fieldIndex = 0; fieldIndex < 64; fieldIndex++)
{
masks[fieldIndex] = DiagonalPatternGenerator.GetPattern(fieldIndex) & ~BoardConstants.Edges;
permutations[fieldIndex] = new ulong[1 << MagicShifts.BishopShifts[fieldIndex]];
attacks[fieldIndex] = new ulong[1 << MagicShifts.BishopShifts[fieldIndex]];
for (var permutationIndex = 0; permutationIndex < permutations[fieldIndex].Length; permutationIndex++)
{
permutations[fieldIndex][permutationIndex] = PermutationsGenerator.GetPermutation(masks[fieldIndex], permutationIndex);
attacks[fieldIndex][permutationIndex] = AttacksGenerator.GetDiagonalAttacks(permutations[fieldIndex][permutationIndex], fieldIndex);
}
}
return(_bishopMagicArray = GenerateAttacks(masks, permutations, attacks, MagicShifts.BishopShifts, keys));
}