feat: compute pawn attack table

1 files changed, 12 insertions, 3 deletions

diff --git a/src/board.c b/src/board.c
index a0b1bb7..0c133a8 100644
--- a/src/board.c
+++ b/src/board.c
@@ -37,9 +37,18 @@ void precompute_king_attack_table(Bitboard attacks[64]) {
     U64 position = BIT << index;
 
     attacks[index] =
-      (position & notAFile) << 7  | (position << 8) | (position & notHFile) << 9 |
-      (position & notAFile) >> 1  |                   (position & notHFile) << 1 |
-      (position & notAFile) >> 9  | (position >> 8) | (position & notHFile) >> 7;
+      (position & notAFile) << 7 | (position << 8) | (position & notHFile) << 9 |
+      (position & notAFile) >> 1 |                   (position & notHFile) << 1 |
+      (position & notAFile) >> 9 | (position >> 8) | (position & notHFile) >> 7;
+  }
+}
+
+void precompute_pawn_attack_table(Bitboard attacks[64], BYTE color) {
+  for (int index = 0; index < 64; index++) {
+    U64 position = BIT << index;
+
+    if (color == WHITE) attacks[index] = (position & notAFile) << 7 | (position & notHFile) << 9;
+    else                attacks[index] = (position & notAFile) >> 9 | (position & notHFile) >> 7;
   }
 }