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#include "../moves.h"
void __forloop_bishop_moves_gen(
moves_t* moves,
bitboard_t friendly_type,
bitboard_t friendly_pieces,
bitboard_t enemy_pieces
) {
while (friendly_type) {
int from = __builtin_ctzll(friendly_type);
friendly_type &= friendly_type - 1;
int og_rank = from / 8; // range: [0, 7]
int og_file = from % 8; // range: [0, 7]
int rank = og_rank + 1, file = og_file + 1, index = rank * 8 + file;
while ((rank < 8 && file < 8) && !occupied_by(friendly_pieces, index)) {
add_move(moves, from, index);
if (occupied_by(enemy_pieces, index)) {
break;
}
index = ++rank * 8 + ++file;
}
rank = og_rank - 1, file = og_file - 1, index = rank * 8 + file;
while ((rank >= 0 && file >= 0) && !occupied_by(friendly_pieces, index)) {
add_move(moves, from, index);
if (occupied_by(enemy_pieces, index)) {
break;
}
index = --rank * 8 + --file;
}
rank = og_rank - 1, file = og_file + 1, index = rank * 8 + file;
while ((rank >= 0 && file < 8) && !occupied_by(friendly_pieces, index)) {
add_move(moves, from, index);
if (occupied_by(enemy_pieces, index)) {
break;
}
index = --rank * 8 + ++file;
}
rank = og_rank + 1, file = og_file - 1, index = rank * 8 + file;
while ((rank < 8 && file >= 0) && !occupied_by(friendly_pieces, index)) {
add_move(moves, from, index);
if (occupied_by(enemy_pieces, index)) {
break;
}
index = ++rank * 8 + --file;
}
}
}
void get_bishop_moves(moves_t* moves, position_t position) {
assert_valid_position(position);
bitboard_t friendly_bishops;
bitboard_t friendly_pieces;
bitboard_t enemy_pieces;
if (position.turn == WHITE_TURN) {
friendly_pieces = whites(position);
enemy_pieces = blacks(position);
friendly_bishops = position.bitboards[WHITE_BISHOP];
} else {
friendly_pieces = blacks(position);
enemy_pieces = whites(position);
friendly_bishops = position.bitboards[BLACK_BISHOP];
}
__forloop_bishop_moves_gen(
moves,
friendly_bishops,
friendly_pieces,
enemy_pieces
);
}
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