pawn forward movement works?

1 files changed, 47 insertions, 0 deletions

diff --git a/src/search/pawn_moves.c b/src/search/pawn_moves.c
index e69de29..58eac83 100644
--- a/src/search/pawn_moves.c
+++ b/src/search/pawn_moves.c
@@ -0,0 +1,47 @@
+#include "../search.h"
+#include <assert.h>
+
+void get_white_pawn_moves(moves_t* moves, position_t position) {
+  bitboard_t enemy_bitboard = blacks(position);
+  bitboard_t friendly_pieces =
+    position.bitboards[WHITE_KING] |
+    position.bitboards[WHITE_QUEEN] |
+    position.bitboards[WHITE_ROOK] |
+    position.bitboards[WHITE_BISHOP] |
+    position.bitboards[WHITE_KNIGHT];
+  bitboard_t friendly_pawns = position.bitboards[WHITE_PAWN];
+  bitboard_t y = friendly_pieces | enemy_bitboard;
+  bitboard_t x = ~((friendly_pawns << 8) & y) & (friendly_pawns << 8);
+  bitboard_t first_move_x = x | BITMASK_RANK_C;
+
+  first_move_x |= (first_move_x << 8) & (~y);
+  x |= first_move_x;
+
+  print_bitboard(x);
+}
+void get_black_pawn_moves(moves_t* moves, position_t position) {
+  bitboard_t enemy_bitboard = whites(position);
+  bitboard_t friendly_pieces =
+    position.bitboards[BLACK_KING] |
+    position.bitboards[BLACK_QUEEN] |
+    position.bitboards[BLACK_ROOK] |
+    position.bitboards[BLACK_BISHOP] |
+    position.bitboards[BLACK_KNIGHT];
+  bitboard_t friendly_pawns = position.bitboards[BLACK_PAWN];
+  bitboard_t y = friendly_pieces | enemy_bitboard;
+  bitboard_t x = ~((friendly_pawns << 8) & y) & (friendly_pawns << 8);
+  bitboard_t first_move_x = x | BITMASK_RANK_F;
+
+  first_move_x |= (first_move_x >> 8) & (~y);
+  x |= first_move_x;
+}
+
+void get_pawn_moves(moves_t* moves, position_t position) {
+  assert_valid_position(position);
+
+  if (position.turn == WHITE_TURN) {
+    get_white_pawn_moves(moves, position);
+  } else {
+    get_black_pawn_moves(moves, position);
+  }
+}