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small refactoring

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This commit is contained in:
Karma Riuk 2025-02-06 15:45:32 +01:00
parent 6d8a3f7dc0
commit 5f093907f3
2 changed files with 22 additions and 14 deletions
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28
cpp/src/board.cpp
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@ -181,10 +181,12 @@ Board Board::make_move(Move move) const {
ret.squares[move.source_square] = Piece::None;
ret.squares[move.target_square] = this->squares[move.source_square];
int8_t source_piece = piece_at(move.source_square);
int8_t target_piece = piece_at(move.target_square);
// -- Handle en passant target being eaten
if (en_passant_target != -1
&& (squares[move.source_square] & 0b111) == Piece::Pawn
&& squares[move.target_square] == Piece::None)
if (en_passant_target != -1 && source_piece == Piece::Pawn
&& target_piece == Piece::None)
ret.squares[move.target_square + (white_to_play ? -8 : 8)] =
Piece::None;
@ -193,7 +195,7 @@ Board Board::make_move(Move move) const {
ret.squares[move.target_square] = move.promoting_to;
// -- Set en passant target if need
if ((squares[move.source_square] & 0b111) == Piece::Pawn
if (source_piece == Piece::Pawn
&& std::abs(move.target_square - move.source_square) == 16) {
if (white_to_play)
ret.en_passant_target = move.target_square - 8;
@ -205,7 +207,7 @@ Board Board::make_move(Move move) const {
// -- Handle castling (just move the rook over)
Coords c = Coords::from_index(move.source_square);
if ((squares[move.source_square] & 0b111) == Piece::King) {
if (source_piece == Piece::King) {
if (move.target_square - move.source_square == 2) { // king side castle
Coords rook_source{7, c.y};
int8_t old_rook = ret.squares[rook_source.to_index()];
@ -226,10 +228,10 @@ Board Board::make_move(Move move) const {
ret.b_castle_rights = b_castle_rights;
bool is_capturing = squares[move.target_square] != Piece::None;
if (white_to_play) {
if ((squares[move.source_square] & 0b111) == King)
if (source_piece == King)
ret.w_castle_rights = NeitherSide;
if ((squares[move.source_square] & 0b111) == Rook) {
if (source_piece == Rook) {
if (c.x == 0 && (ret.w_castle_rights & QueenSide))
ret.w_castle_rights &= ~(QueenSide);
if (c.x == 7 && (ret.w_castle_rights & KingSide))
@ -237,18 +239,17 @@ Board Board::make_move(Move move) const {
}
Coords target = Coords::from_index(move.target_square);
if (is_capturing && target.y == 7
&& (squares[move.target_square] & 0b111) == Rook) {
if (is_capturing && target.y == 7 && target_piece == Rook) {
if (target.x == 0 && (ret.b_castle_rights & QueenSide))
ret.b_castle_rights &= ~(QueenSide);
if (target.x == 7 && (ret.b_castle_rights & KingSide))
ret.b_castle_rights &= ~(KingSide);
}
} else {
if ((squares[move.source_square] & 0b111) == King)
if (source_piece == King)
ret.b_castle_rights = NeitherSide;
if ((squares[move.source_square] & 0b111) == Rook) {
if (source_piece == Rook) {
if (c.x == 0 && (ret.b_castle_rights & QueenSide))
ret.b_castle_rights &= ~(QueenSide);
if (c.x == 7 && (ret.b_castle_rights & KingSide))
@ -256,8 +257,7 @@ Board Board::make_move(Move move) const {
}
Coords target = Coords::from_index(move.target_square);
if (is_capturing && target.y == 0
&& (squares[move.target_square] & 0b111) == Rook) {
if (is_capturing && target.y == 0 && target_piece == Rook) {
if (target.x == 0 && (ret.w_castle_rights & QueenSide))
ret.w_castle_rights &= ~(QueenSide);
if (target.x == 7 && (ret.w_castle_rights & KingSide))
@ -290,7 +290,7 @@ bool Board::is_check_for(int8_t colour) const {
if (this->squares[i] == Piece::None || colour_at(i) == colour)
continue;
std::vector<int8_t> targets;
if ((squares[i] & 0b00111) == King) {
if (piece_at(i) == King) {
// special case for the king, because it creates infinite recursion
// (since he looks if he's walking into a check)
Coords king_pos = Coords::from_index(i);

8
cpp/src/board.hpp
View File

@ -41,6 +41,14 @@ struct Board {
|| is_stalemate_for(White) || is_stalemate_for(Black);
}
int8_t piece_at(int8_t idx) const {
return squares[idx] & 0b00111;
}
int8_t piece_at(Coords xy) const {
return piece_at(xy.to_index());
}
int8_t colour_at(int8_t idx) const {
return squares[idx] & 0b11000;
}