/*
* Slide puzzle core game logic
- * Copyright © 2022 Nick Bowler
+ * Copyright © 2022-2023 Nick Bowler
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#define GOAL_SHIFT 6
#define GOAL_MASK 0x739c0ul
+#define GAME_MASK 0x1fffffful
struct board {
/*
*/
static inline uint_fast32_t board_above(int y)
{
- uint_fast32_t val = board_row(y);
-
- return val | (val-1);
+ return ( 0x20ul << 5*y ) - 1;
}
/*
*/
static inline uint_fast32_t board_below(int y)
{
- uint_fast32_t val = board_row(y);
-
- return val | (~val + 1);
+ return ~( 1ul << 5*y ) + 1;
}
/*
return ~val + 0x108421;
}
+/*
+ * Return the board bitmap setting the rectangle of locations that are:
+ *
+ * - on or right of column x1, and
+ * - on or left of column x2, and
+ * - on or below row y1, and
+ * - on or above row y2.
+ *
+ * It must be the case that x2 >= x1 and y2 >= y1.
+ */
+static inline uint_fast32_t board_rect(int x1, int y1, int x2, int y2)
+{
+ return (board_left(x2-x1) << x1) & (board_above(y2-y1) << 5*y1);
+}
+
+/*
+ * Extract the tile colour from a specific position of one of the
+ * arrays of tile bitmaps. The position is a bit index. So for
+ * example, game the tile at a given (x, y) position can be extracted
+ * by board_tile(board.game, 5*y+x).
+ */
+#define board_tile(planes, bit) (((0[planes]<<0) >> (bit)) & 1) \
+ | (((1[planes]<<1) >> (bit)) & 2) \
+ | (((2[planes]<<2) >> (bit)) & 4)
+
/*
* 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
*/
int_fast32_t game_finish(struct board *board);
+/*
+ * Constructs a new set of game bitmaps into buf, with tiles in the
+ * objective area replaced by the goal tile colours, and returns buf.
+ */
+static inline uint_least32_t *
+game_overlay_goal(struct board *board, uint_least32_t *buf)
+{
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ buf[i] = (unsigned long)board->goal[i] << GOAL_SHIFT;
+ buf[i] = (buf[i] & GOAL_MASK) | (board->game[i] & ~GOAL_MASK);
+ }
+
+ return buf;
+}
+
#endif