X-Git-Url: http://git.draconx.ca/gitweb/rrace.git/blobdiff_plain/a13b072946d80c2da325e90cb73d96a25485a80a..8e6b9fd79ca87c131d33d74d40f68df9696c7f5c:/src/game.h

diff --git a/src/game.h b/src/game.h
index fb2fe97..6a02a42 100644
--- a/src/game.h
+++ b/src/game.h
@@ -32,7 +32,9 @@ enum {
 	TILE_MAX
 };
 
-enum { GOAL_SHIFT = 6 };
+#define GOAL_SHIFT 6
+#define GOAL_MASK 0x739c0ul
+
 struct board {
 	/*
 	 * Bit planes representing the current game area.
@@ -111,6 +113,46 @@ static inline uint_fast32_t board_mask_v(int x, int y0, int y1)
 	return (col << 5*y1) & (col >> 5*(4-y0));
 }
 
+/*
+ * Return the board bitmap setting locations on or above row y.
+ */
+static inline uint_fast32_t board_above(int y)
+{
+	uint_fast32_t val = board_row(y);
+
+	return val | (val-1);
+}
+
+/*
+ * Return the board bitmap setting locations on or below row y.
+ */
+static inline uint_fast32_t board_below(int y)
+{
+	uint_fast32_t val = board_row(y);
+
+	return val | (~val + 1);
+}
+
+/*
+ * Return the board bitmap setting locations on or left of column x.
+ */
+static inline uint_fast32_t board_left(int x)
+{
+	uint_fast32_t val = board_column(x);
+
+	return val | (val - 0x108421);
+}
+
+/*
+ * Return the board bitmap setting locations on or right of column x.
+ */
+static inline uint_fast32_t board_right(int x)
+{
+	uint_fast32_t val = board_column(x);
+
+	return ~val + 0x108421;
+}
+
 /*
  * Move the bits in the game bitmaps according to a move at position (x, y),
  * and update the location of the empty position which, if the move was valid