2025-02-02 17:16:37 +01:00
|
|
|
#include "../board.hpp"
|
2025-02-02 18:17:37 +01:00
|
|
|
#include "../move.hpp"
|
2025-02-02 17:16:37 +01:00
|
|
|
#include "piece.hpp"
|
|
|
|
|
2025-02-02 18:17:37 +01:00
|
|
|
std::vector<Move> pawn_moves(const Board& b, const Coords xy) {
|
|
|
|
std::vector<Move> ret{};
|
|
|
|
int8_t me = b.squares[xy.to_index()];
|
|
|
|
int8_t my_colour = me & 0b11000;
|
|
|
|
|
|
|
|
// -- Capture to the left
|
|
|
|
if (xy.x > 0) {
|
|
|
|
int dy = my_colour == Colour::White ? 1 : -1;
|
|
|
|
Coords left{xy.x - 1, xy.y + dy};
|
|
|
|
int8_t capturable_piece = b.squares[left.to_index()];
|
|
|
|
if (capturable_piece != 0) {
|
|
|
|
if (my_colour != (capturable_piece & 0b11000))
|
|
|
|
ret.push_back(Move{xy.to_index(), left.to_index()});
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// -- Capture to the right
|
|
|
|
if (xy.x < 7) {
|
|
|
|
int dy = my_colour == Colour::White ? 1 : -1;
|
|
|
|
Coords right{xy.x + 1, xy.y + dy};
|
|
|
|
int8_t capturable_piece = b.squares[right.to_index()];
|
|
|
|
if (capturable_piece != 0) {
|
|
|
|
if (my_colour != (capturable_piece & 0b11000))
|
|
|
|
ret.push_back(Move{xy.to_index(), right.to_index()});
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
bool is_on_starting_rank =
|
|
|
|
my_colour == Colour::White ? xy.y == 1 : xy.y == 6;
|
|
|
|
int max_dy = is_on_starting_rank ? 3 : 2;
|
|
|
|
for (int dy = 1; dy < max_dy; dy++) {
|
|
|
|
int actual_dy = my_colour == Colour::White ? dy : -dy;
|
|
|
|
Coords new_xy{xy.x, xy.y + actual_dy};
|
|
|
|
if (b.squares[new_xy.to_index()] != Piece::None)
|
|
|
|
break;
|
|
|
|
if (new_xy.y == 7 || new_xy.y == 0)
|
|
|
|
for (auto piece : {Queen, Knigt, Bishop, Rook})
|
|
|
|
ret.push_back(Move{
|
|
|
|
xy.to_index(),
|
|
|
|
new_xy.to_index(),
|
|
|
|
.promoting_to = piece
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
2025-02-02 17:16:37 +01:00
|
|
|
}
|