From edb7409e7f12bfa3d749f31b3706deade63b5ddc Mon Sep 17 00:00:00 2001
From: Ole Morud <ole.morud@gmail.com>
Date: Mon, 1 Apr 2024 01:33:47 +0200
Subject: [PATCH] asd

---
 src/board.h | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/map.h   | 10 ++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 src/board.h

diff --git a/src/board.h b/src/board.h
new file mode 100644
index 0000000..756b31e
--- /dev/null
+++ b/src/board.h
@@ -0,0 +1,56 @@
+
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <assert.h>
+
+typedef uint64_t     bitmap_t;
+typedef uint_fast8_t index_t;
+typedef int_fast8_t  piece_t;
+
+enum tile_info {
+    EMPTY     = 0b0000,
+    KING      = 0b0001,
+    QUEEN     = 0b0010,
+    ROOK      = 0b0011,
+    BISHOP    = 0b0100,
+    KNIGHT    = 0b0101,
+    PAWN      = 0b0110,
+    COLOR_BIT = 0b1000,
+
+    PIECE_UNKNOWN=-1
+};
+
+struct board {
+    static_assert(sizeof(bitmap_t) == 64/8, "bitmap_t must be 64 bits long");
+    bitmap_t pieces[4]; // 4 bits correspond to 1 tile
+};
+
+static inline bitmap_t bit(index_t i)
+{
+    return 0b111UL << 3*i;
+}
+
+static bool is_white(piece_t piece)
+{
+    return piece % 2 == 0;
+}
+
+static bool is_black(piece_t piece)
+{
+    return piece % 2 == 1;
+}
+
+static piece_t piece_at(struct board* board, index_t tile)
+{
+    for (size_t i = 0; i < sizeof board->pieces / board->pieces[0]; i++) {
+        if (bit(tile) & board->pieces[i]) {
+            return i;
+        }
+    }
+    return PIECE_UNKNOWN;
+}
+
+
diff --git a/src/map.h b/src/map.h
index 1fff232..a91f5a5 100644
--- a/src/map.h
+++ b/src/map.h
@@ -1,5 +1,15 @@
 
 
+enum chess_piece {
+    EMPTY  = 0,
+    KING   = 1,
+    QUEEN  = 2,
+    ROOK   = 3,
+    BISHOP = 4,
+    KNIGHT = 5,
+    PAWN   = 6,
+    PIECE_COUNT,
+};
 
 static bool board_equals(