| 1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\ |
| 2 | * This is GNU Go, a Go program. Contact gnugo@gnu.org, or see * |
| 3 | * http://www.gnu.org/software/gnugo/ for more information. * |
| 4 | * * |
| 5 | * Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, * |
| 6 | * 2008 and 2009 by the Free Software Foundation. * |
| 7 | * * |
| 8 | * This program is free software; you can redistribute it and/or * |
| 9 | * modify it under the terms of the GNU General Public License as * |
| 10 | * published by the Free Software Foundation - version 3 or * |
| 11 | * (at your option) any later version. * |
| 12 | * * |
| 13 | * This program is distributed in the hope that it will be useful, * |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| 16 | * GNU General Public License in file COPYING for more details. * |
| 17 | * * |
| 18 | * You should have received a copy of the GNU General Public * |
| 19 | * License along with this program; if not, write to the Free * |
| 20 | * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * |
| 21 | * Boston, MA 02111, USA. * |
| 22 | \* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
| 23 | |
| 24 | |
| 25 | struct heap_entry; |
| 26 | struct connection_data; |
| 27 | |
| 28 | /* Expensive functions that we try to evaluate as late as possible |
| 29 | * when spreading connection distances. |
| 30 | */ |
| 31 | typedef void (*connection_helper_fn_ptr) (struct connection_data *conn, |
| 32 | int color); |
| 33 | |
| 34 | /* This heap contains a list of positions where we have delayed a |
| 35 | * decision whether to "spread a connection distance". The function |
| 36 | * helper() will be called when we finally need the decision. See |
| 37 | * push_connection_heap_entry() for organization of the heap. |
| 38 | */ |
| 39 | struct heap_entry { |
| 40 | int distance; |
| 41 | int coming_from; |
| 42 | int target; |
| 43 | connection_helper_fn_ptr helper; |
| 44 | }; |
| 45 | |
| 46 | /* Fixed-point arithmetic helper macros */ |
| 47 | #define FIXED_POINT_BASIS 10000 |
| 48 | #define FP(x) ((int) (0.5 + FIXED_POINT_BASIS * (x))) |
| 49 | #define FIXED_TO_FLOAT(x) ((x) / (float) FIXED_POINT_BASIS) |
| 50 | |
| 51 | #define HUGE_CONNECTION_DISTANCE FP(100.0) |
| 52 | |
| 53 | struct connection_data { |
| 54 | int distances[BOARDMAX]; |
| 55 | int deltas[BOARDMAX]; |
| 56 | int coming_from[BOARDMAX]; |
| 57 | int vulnerable1[BOARDMAX]; |
| 58 | int vulnerable2[BOARDMAX]; |
| 59 | int queue[BOARDMAX]; |
| 60 | int queue_start; |
| 61 | int queue_end; |
| 62 | |
| 63 | int heap_data_size; |
| 64 | int heap_size; |
| 65 | struct heap_entry heap_data[4 * BOARDMAX]; |
| 66 | struct heap_entry *heap[BOARDMAX]; |
| 67 | |
| 68 | int target; |
| 69 | int cutoff_distance; |
| 70 | int speculative; |
| 71 | }; |
| 72 | |
| 73 | |
| 74 | void compute_connection_distances(int str, int target, int cutoff, |
| 75 | struct connection_data *conn, |
| 76 | int speculative); |
| 77 | void init_connection_data(int color, const signed char goal[BOARDMAX], |
| 78 | int target, int cutoff, |
| 79 | struct connection_data *conn, int speculative); |
| 80 | void spread_connection_distances(int color, struct connection_data *conn); |
| 81 | void sort_connection_queue_tail(struct connection_data *conn); |
| 82 | void expand_connection_queue(struct connection_data *conn); |
| 83 | void print_connection_distances(struct connection_data *conn); |
| 84 | |
| 85 | |
| 86 | /* |
| 87 | * Local Variables: |
| 88 | * tab-width: 8 |
| 89 | * c-basic-offset: 2 |
| 90 | * End: |
| 91 | */ |