85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
#include "BitBoard.hpp"
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BitBoard::BitBoard(uint64_t v) {
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mBoard = v;
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}
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std::ostream &operator<<(std::ostream &os, const BitBoard &board) {
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// For debugging only, performance isn't important
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for (int i = 7; i >= 0; i--) {
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int rank = i * 8;
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for (int j = 0; j < 8; j++) {
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// Get the piece for this index. Assume it exists.
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// Print piece, otherwise '.';
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if (board.mBoard & (1ULL << (rank + j))) {
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os << 1;
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} else {
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os << '.';
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}
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os << ' ';
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}
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os << '\n';
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}
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return os;
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}
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BitBoard BitBoard::northFill() const {
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BitBoard result(mBoard);
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result |= (result << 8);
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result |= (result << 16);
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result |= (result << 32);
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return (result << 8);
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}
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BitBoard BitBoard::southFill() const {
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BitBoard result(mBoard);
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result |= (result >> 8);
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result |= (result >> 16);
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result |= (result >> 32);
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return result;
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}
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BitBoard BitBoard::fileFill() const {
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return northFill() | southFill();
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}
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BitBoard BitBoard::kingAttacks(const BitBoard bb) {
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BitBoard result = bb.east() | bb.west() | bb;
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result |= (result.north() | result.south());
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result ^= bb;
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return result;
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}
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BitBoard BitBoard::bishopAttacks(BitBoard bishops, BitBoard empty) {
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BitBoard result = 0;
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BitBoard diag1 = bishops;
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BitBoard diag2 = bishops;
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empty ^= bishops;
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for (int i = 0; i < 7; i++) {
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result |= (diag1 | diag2);
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diag1 = (diag1.northWest() | diag1.southEast()) & empty;
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diag2 = (diag2.northEast() | diag2.southWest()) & empty;
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}
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return (result | diag1.northWest() | diag1.southEast() | diag2.northEast() | diag2.southWest()) & ~bishops;
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}
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BitBoard BitBoard::pawnNorthAttacks(BitBoard pawns, BitBoard targets) {
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return (pawns.northEast() | pawns.northWest()) & targets;
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}
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BitBoard BitBoard::pawnNorthMoves(BitBoard pawns, BitBoard empty) {
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pawns = pawns.north() & empty;
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return (pawns | (pawns.north() & Rank4)) & empty;
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}
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BitBoard BitBoard::pawnSouthAttacks(BitBoard pawns, BitBoard targets) {
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return (pawns.southEast() | pawns.southWest()) & targets;
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}
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BitBoard BitBoard::pawnSouthMoves(BitBoard pawns, BitBoard empty) {
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pawns = pawns.south() & empty;
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return (pawns | (pawns.south() & Rank5)) & empty;
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} |