288 lines
9.2 KiB
Rust
288 lines
9.2 KiB
Rust
use strum_macros::EnumIter;
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use u64 as Bitboard;
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use crate::board::bitboard::{have_common_bit, lsb, square_to_bitboard};
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use crate::board::state::State;
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use crate::movegen::attack_generator::{
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fetch_bishop_attacks, fetch_king_attacks, fetch_knight_attacks, fetch_pawn_attacks,
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fetch_queen_attacks, fetch_rook_attacks,
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};
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use crate::movegen::move_generator::{
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bishop_pseudo_moves, king_pseudo_moves, knight_pseudo_moves, pawn_pseudo_moves,
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queen_pseudo_moves, rook_pseudo_moves,
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};
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use crate::movegen::r#move::{Move, MoveType, Promote};
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct Board {
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pub pieces: [Bitboard; 6],
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pub color: [Bitboard; 2],
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pub state: State,
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}
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impl Board {
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pub const fn startpos() -> Self {
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Self {
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pieces: [
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0xff00000000ff00,
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0x4200000000000042,
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0x2400000000000024,
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0x8100000000000081,
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0x800000000000008,
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0x1000000000000010,
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],
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color: [0xffff, 0xffff000000000000],
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state: State::new(),
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}
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}
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pub const fn new_empty() -> Self {
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Self {
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pieces: [0x0, 0x0, 0x0, 0x0, 0x0, 0x0],
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color: [0x0, 0x0],
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state: State::new(),
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}
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}
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pub fn is_attacked(&self, square: usize, opponent_color: Color) -> bool {
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let all_occupancies = self.color[Color::White] | self.color[Color::Black];
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let own_color = opponent_color.opponent();
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let opponent_color_bb = &self.color[opponent_color];
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let pawns = self.pieces[PieceType::Pawn] & opponent_color_bb;
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let knights = self.pieces[PieceType::Knight] & opponent_color_bb;
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let bishops = self.pieces[PieceType::Bishop] & opponent_color_bb;
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let rooks = self.pieces[PieceType::Rook] & opponent_color_bb;
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let queens = self.pieces[PieceType::Queen] & opponent_color_bb;
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let king = self.pieces[PieceType::King] & opponent_color_bb;
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have_common_bit(pawns, fetch_pawn_attacks(square, own_color))
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|| have_common_bit(knights, fetch_knight_attacks(square))
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|| have_common_bit(bishops, fetch_bishop_attacks(all_occupancies, square))
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|| have_common_bit(rooks, fetch_rook_attacks(all_occupancies, square))
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|| have_common_bit(queens, fetch_queen_attacks(all_occupancies, square))
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|| have_common_bit(king, fetch_king_attacks(square))
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}
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pub fn king_under_check(&self, color: Color) -> bool {
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let own_king_square = lsb(self.pieces[PieceType::King] & self.color[color]);
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self.is_attacked(own_king_square, color.opponent())
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}
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pub fn pseudo_moves_all(&self) -> Vec<Move> {
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let color = self.state.current_player();
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let mut moves = vec![];
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moves.extend(self.pseudo_moves(color, PieceType::Pawn));
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moves.extend(self.pseudo_moves(color, PieceType::Knight));
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moves.extend(self.pseudo_moves(color, PieceType::Bishop));
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moves.extend(self.pseudo_moves(color, PieceType::Rook));
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moves.extend(self.pseudo_moves(color, PieceType::Queen));
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moves.extend(self.pseudo_moves(color, PieceType::King));
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moves
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}
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pub fn pseudo_moves_all_captures(&self) -> Vec<Move> {
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self.pseudo_moves_all()
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.into_iter()
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.filter(|m| {
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matches!(
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m.move_type,
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MoveType::Capture | MoveType::PromotionCapture(_)
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)
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})
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.collect()
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}
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pub fn pseudo_moves(&self, color: Color, piece_type: PieceType) -> Vec<Move> {
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let all_occupancies = self.color[Color::White] | self.color[Color::Black];
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let pieces = self.pieces[piece_type] & self.color[color];
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let own_occupancies = self.color[color];
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let opponent_occupancies = self.color[color.opponent()];
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match piece_type {
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PieceType::Pawn => pawn_pseudo_moves(
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pieces,
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all_occupancies,
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opponent_occupancies,
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self.state.en_passant_square(),
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color,
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),
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PieceType::Knight => knight_pseudo_moves(pieces, all_occupancies, own_occupancies),
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PieceType::Bishop => bishop_pseudo_moves(pieces, all_occupancies, own_occupancies),
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PieceType::Rook => rook_pseudo_moves(pieces, all_occupancies, own_occupancies),
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PieceType::Queen => queen_pseudo_moves(pieces, all_occupancies, own_occupancies),
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PieceType::King => {
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king_pseudo_moves(pieces, all_occupancies, own_occupancies, self, color)
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}
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}
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}
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pub fn set_piece(&mut self, bb: Bitboard, piece_type: PieceType, color: Color) {
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self.pieces[piece_type] |= bb;
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self.color[color] |= bb;
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}
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pub fn set_state(&mut self, state: State) {
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self.state = state;
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}
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pub fn is_pawn_move(&self, square: usize) -> bool {
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let side = self.state.current_player();
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let own_pawns = self.pieces[PieceType::Pawn] & self.color[side];
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have_common_bit(square_to_bitboard(square), own_pawns)
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}
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pub fn move_piece(&mut self, src: usize, dst: usize, piece_type: PieceType) {
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self.pieces[piece_type] &= !square_to_bitboard(src);
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self.pieces[piece_type] |= square_to_bitboard(dst);
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self.color[self.state.current_player()] &= !square_to_bitboard(src);
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self.color[self.state.current_player()] |= square_to_bitboard(dst);
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}
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pub fn insert_own_piece(&mut self, square: usize, piece_type: PieceType) {
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self.pieces[piece_type] |= square_to_bitboard(square);
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self.color[self.state.current_player()] |= square_to_bitboard(square);
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}
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pub fn insert_opponent_piece(&mut self, square: usize, piece_type: PieceType) {
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self.pieces[piece_type] |= square_to_bitboard(square);
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self.color[self.state.next_player()] |= square_to_bitboard(square);
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}
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pub fn remove_own_piece(&mut self, square: usize, piece_type: PieceType) {
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self.pieces[piece_type] &= !square_to_bitboard(square);
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self.color[self.state.current_player()] &= !square_to_bitboard(square);
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}
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pub fn remove_opponent_piece(&mut self, square: usize, piece_type: PieceType) {
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self.pieces[piece_type] &= !square_to_bitboard(square);
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self.color[self.state.next_player()] &= !square_to_bitboard(square);
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}
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pub fn promote_piece(&mut self, square: usize, promote: &Promote) {
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match promote {
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Promote::Knight => self.pieces[PieceType::Knight] |= square_to_bitboard(square),
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Promote::Bishop => self.pieces[PieceType::Bishop] |= square_to_bitboard(square),
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Promote::Rook => self.pieces[PieceType::Rook] |= square_to_bitboard(square),
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Promote::Queen => self.pieces[PieceType::Queen] |= square_to_bitboard(square),
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};
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self.color[self.state.current_player()] |= square_to_bitboard(square);
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}
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}
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impl Default for Board {
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fn default() -> Self {
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Self::new_empty()
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}
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}
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#[derive(Debug, PartialEq, Eq, Clone, Copy, EnumIter)]
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pub enum PieceType {
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Pawn,
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Knight,
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Bishop,
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Rook,
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Queen,
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King,
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}
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impl PieceType {
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pub const fn idx(self) -> usize {
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self as usize
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}
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pub const fn score(self) -> i32 {
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match self {
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Self::Pawn => 100,
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Self::Knight => 320,
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Self::Bishop => 330,
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Self::Rook => 500,
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Self::Queen => 900,
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Self::King => 20000,
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}
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}
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}
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use std::ops::{Index, IndexMut};
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impl<T> Index<PieceType> for [T] {
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type Output = T;
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fn index(&self, piece_type: PieceType) -> &Self::Output {
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&self[piece_type.idx()]
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}
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}
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impl<T> IndexMut<PieceType> for [T] {
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fn index_mut(&mut self, piece_type: PieceType) -> &mut Self::Output {
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&mut self[piece_type.idx()]
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}
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}
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#[derive(Debug, PartialEq, Eq, Clone, Copy, EnumIter)]
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pub enum Color {
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White,
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Black,
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}
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impl Color {
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pub const fn idx(self) -> usize {
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self as usize
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}
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pub const fn opponent(self) -> Self {
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match self {
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Self::White => Self::Black,
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Self::Black => Self::White,
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}
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}
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}
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impl<T> Index<Color> for [T] {
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type Output = T;
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fn index(&self, color: Color) -> &Self::Output {
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&self[color.idx()]
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}
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}
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impl<T> IndexMut<Color> for [T] {
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fn index_mut(&mut self, color: Color) -> &mut Self::Output {
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&mut self[color.idx()]
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::{board::fen::from_fen, movegen::attack_generator::init_attacks};
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use super::*;
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const FEN_EXAMPLE: [&str; 1] = ["8/6P1/4n2b/1p6/1Kp5/6n1/4b3/1k6 w - - 0 1"];
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#[test]
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fn test_occupancies() -> Result<(), String> {
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let new_game = from_fen(FEN_EXAMPLE[0])?;
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assert_eq!(new_game.board.color[Color::White], 0x40000002000000);
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assert_eq!(new_game.board.color[Color::Black], 0x900204401002);
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assert_eq!(
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new_game.board.color[Color::White] | new_game.board.color[Color::Black],
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0x40900206401002
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);
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Ok(())
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}
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#[test]
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fn test_is_attacked() -> Result<(), String> {
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let new_game = from_fen(FEN_EXAMPLE[0])?;
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init_attacks();
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assert!(new_game.board.is_attacked(54, Color::Black));
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Ok(())
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}
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}
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