From 72761f770a73e3e8fac9b57043ed19f084bfb230 Mon Sep 17 00:00:00 2001
From: eug-vs <eugene@eug-vs.xyz>
Date: Mon, 26 Jun 2023 20:01:36 +0300
Subject: tmp: save progress from @black-pearl

---
 src/bitboard.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'src/bitboard.c')

diff --git a/src/bitboard.c b/src/bitboard.c
index e53e3ed..96f220d 100644
--- a/src/bitboard.c
+++ b/src/bitboard.c
@@ -35,3 +35,29 @@ inline int bitscanAndReset(Bitboard* bb) {
   *bb &= *bb - 1;
   return idx;
 }
+
+
+/* These 4 blindly copied from chessprogramming.org TODO: rewrite */
+U64 rankMask(enumSquare sq) {
+  return  C64(0xff) << (sq & 56);
+}
+
+U64 fileMask(enumSquare sq) {
+  return C64(0x0101010101010101) << (sq & 7);
+}
+
+U64 diagonalMask(enumSquare sq) {
+   const U64 maindia = C64(0x8040201008040201);
+   int diag =8*(sq & 7) - (sq & 56);
+   int nort = -diag & ( diag >> 31);
+   int sout =  diag & (-diag >> 31);
+   return (maindia >> sout) << nort;
+}
+
+U64 antiDiagMask(enumSquare sq) {
+   const U64 maindia = C64(0x0102040810204080);
+   int diag =56- 8*(sq&7) - (sq&56);
+   int nort = -diag & ( diag >> 31);
+   int sout =  diag & (-diag >> 31);
+   return (maindia >> sout) << nort;
+}
-- 
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