3 * This file is part of PlomRogue. PlomRogue is licensed under the GPL version 3
4 * or any later version. For details on its copyright, license, and warranties,
5 * see the file NOTICE in the root directory of the PlomRogue source package.
9 #include <stdint.h> /* uint8_t, uint16_t, uint32_t, int16_t, UINT16_MAX */
10 #include <stdlib.h> /* free() */
11 #include "../common/try_malloc.h" /* try_malloc() */
12 #include "hardcoded_strings.h" /* s */
13 #include "thing_actions.h" /* get_thing_action_id_by_name() */
14 #include "things.h" /* Thing, ThingType, ThingInMemory */
15 #include "world.h" /* world */
23 /* Write into "neighbors" scores of the N_DIRS immediate neighbors of the
24 * "score_map" cell at "pos_i" (array index), as found in the directions
25 * north-east, east, south-east etc. (clockwise order). Use "max_score" for
26 * illegal neighborhoods (i.e. if direction would lead beyond the map's border).
28 static void get_neighbor_scores(uint16_t * score_map, uint16_t pos_i,
29 uint16_t max_score, uint16_t * neighbors);
31 /* Iterate over scored cells in "score_map" of world.map's geometry. Compare
32 * each cell's score against the score of its immediate neighbors in N_DIRS
33 * directions. If any neighbor's score is at least two points lower than the
34 * current cell's score, re-set it to 1 point higher than its lowest-scored
35 * neighbor. Repeat this whole process until all cells have settled on their
36 * final score. Ignore cells whose score is greater than "max_score". Expect
37 * "max_score" to be the maximum score for cells, marking them as unreachable.
39 static void dijkstra_map(uint16_t * score_map, uint16_t max_score);
41 /* get_dir_to_nearest_target() helper: Prepare "score_map" for dijkstra_map(). */
42 static void init_score_map(char filter, uint16_t * score_map, uint32_t map_size,
43 struct Thing * t_eye);
45 /* Set (if possible) as "t_eye"'s command a move to the path to the path-wise
46 * nearest target that is not "t_eye" and fits criteria set by "filter". On
47 * success, return !0, else 0. Values for "filter":
48 * "e": thing in FOV is animate, but not of "t_eye"'s thing type; build path as
49 * avoiding things of "t_eye"'s type
50 * "c": thing in memorized map is consumable
51 * "s": memory map cell with greatest-reachable degree of unexploredness
53 static uint8_t get_dir_to_nearest_target(struct Thing * t_eye, char filter);
55 /* Return 1 if any thing not "t_eye" is known and fulfills some criteria defined
56 * by "filter", else 0. Values for "filter":
57 * "e": thing in FOV is animate, but not of "t_eye"'s thing type
58 * "c": thing in memorized map is consumable
60 static uint8_t seeing_thing(struct Thing * t_eye, char filter);
62 /* Return slot ID of strongest consumable in "t_owner"'s inventory, else -1. */
63 static int16_t get_inventory_slot_to_consume(struct Thing * t_owner);
65 /* Return 1 if "t_standing" is standing on a consumable, else 0. */
66 static uint8_t standing_on_consumable(struct Thing * t_standing);
70 static void get_neighbor_scores(uint16_t * score_map, uint16_t pos_i,
71 uint16_t max_score, uint16_t * neighbors)
73 uint32_t map_size = world.map.length * world.map.length;
75 for (i_dir = 0; i_dir < N_DIRS; neighbors[i_dir] = max_score, i_dir++);
76 uint8_t open_north = pos_i >= world.map.length;
77 uint8_t open_east = pos_i + 1 % world.map.length;
78 uint8_t open_south = pos_i + world.map.length < map_size;
79 uint8_t open_west = pos_i % world.map.length;
80 uint8_t is_indented = (pos_i / world.map.length) % 2;
81 uint8_t open_diag_west = is_indented || open_west;
82 uint8_t open_diag_east = !is_indented || open_east;
83 if (open_north && open_diag_east)
85 neighbors[0] = score_map[pos_i - world.map.length + is_indented];
89 neighbors[1] = score_map[pos_i + 1];
91 if (open_south && open_diag_east)
93 neighbors[2] = score_map[pos_i + world.map.length + is_indented];
95 if (open_south && open_diag_west)
97 neighbors[3] = score_map[pos_i + world.map.length - !is_indented];
101 neighbors[4] = score_map[pos_i - 1];
103 if (open_north && open_diag_west)
105 neighbors[5] = score_map[pos_i - world.map.length - !is_indented];
111 static void dijkstra_map(uint16_t * score_map, uint16_t max_score)
113 uint32_t map_size = world.map.length * world.map.length;
115 uint16_t i_scans, neighbors[N_DIRS], min_neighbor;
116 uint8_t scores_still_changing = 1;
118 for (i_scans = 0; scores_still_changing; i_scans++)
120 scores_still_changing = 0;
121 for (pos = 0; pos < map_size; pos++)
123 if (score_map[pos] <= max_score)
125 get_neighbor_scores(score_map, pos, max_score, neighbors);
126 min_neighbor = max_score;
127 for (i_dirs = 0; i_dirs < N_DIRS; i_dirs++)
129 if (min_neighbor > neighbors[i_dirs])
131 min_neighbor = neighbors[i_dirs];
134 if (score_map[pos] > min_neighbor + 1)
136 score_map[pos] = min_neighbor + 1;
137 scores_still_changing = 1;
146 static void init_score_map(char filter, uint16_t * score_map, uint32_t map_size,
147 struct Thing * t_eye)
150 for (i = 0; i < map_size; i++)
152 score_map[i] = UINT16_MAX;
153 if ('.' == t_eye->mem_map[i])
155 score_map[i] = UINT16_MAX-1;
160 struct Thing * t = world.things;
161 for (; t; t = t->next)
163 if ( t==t_eye || !t->lifepoints
164 || 'H' == t_eye->fov_map[t->pos.y*world.map.length + t->pos.x])
168 else if (t->lifepoints && t->type == t_eye->type)
170 score_map[t->pos.y * world.map.length + t->pos.x] = UINT16_MAX;
173 score_map[t->pos.y * world.map.length + t->pos.x] = 0;
176 else if ('c' == filter)
178 struct ThingInMemory * tm = t_eye->t_mem;
179 for (; tm; tm = tm->next)
181 if (' ' == t_eye->mem_map[tm->pos.y * world.map.length + tm->pos.x])
185 struct ThingType * tt = get_thing_type(tm->type);
190 score_map[tm->pos.y * world.map.length + tm->pos.x] = 0;
193 else if (('0' < filter && '9' >= filter) || ' ' == filter)
196 for (i = 0; i < (uint32_t) (world.map.length * world.map.length); i++)
198 score_map[i] = filter == t_eye->mem_depth_map[i] ? 0 : score_map[i];
205 static uint8_t get_dir_to_nearest_target(struct Thing * t_eye, char filter)
207 char dir_to_nearest_target = 0;
208 uint8_t mem_depth_char = ' ';
209 uint8_t run_i = 's' == filter ? 9 /* max explored mem depth age */ + 1 : 1;
210 while ( run_i && !dir_to_nearest_target
211 && ('s' == filter || seeing_thing(t_eye, filter)))
214 uint32_t map_size = world.map.length * world.map.length;
215 uint16_t * score_map = try_malloc(map_size * sizeof(uint16_t),__func__);
216 init_score_map('s' == filter ? mem_depth_char : filter,
217 score_map, map_size, t_eye);
218 mem_depth_char = ' ' == mem_depth_char ? '9' : mem_depth_char - 1;
219 dijkstra_map(score_map, UINT16_MAX-1);
220 uint16_t neighbors[N_DIRS];
221 uint16_t pos_i = (t_eye->pos.y * world.map.length) + t_eye->pos.x;
222 get_neighbor_scores(score_map, pos_i, UINT16_MAX-1, neighbors);
224 uint16_t min_neighbor = UINT16_MAX-1;
225 char * dirs = "edcxsw";/* get_neighbor_scores()'s clockwise dir order.*/
227 for (i = 0; i < N_DIRS; i++)
229 if (min_neighbor > neighbors[i])
231 min_neighbor = neighbors[i];
232 dir_to_nearest_target = dirs[i];
235 if (dir_to_nearest_target)
237 t_eye->command = get_thing_action_id_by_name(s[S_CMD_MOVE]);
238 t_eye->arg = dir_to_nearest_target;
241 return dir_to_nearest_target;
246 static uint8_t seeing_thing(struct Thing * t_eye, char filter)
248 if (t_eye->fov_map && 'e' == filter)
250 struct Thing * t = world.things;
251 for (; t; t = t->next)
254 && 'v' == t_eye->fov_map[t->pos.y*world.map.length + t->pos.x])
256 if (t->lifepoints && t->type != t_eye->type)
263 else if (t_eye->mem_map && 'c' == filter)
265 struct ThingInMemory * tm = t_eye->t_mem;
266 for (; tm; tm = tm->next)
268 if (' ' != t_eye->mem_map[tm->pos.y * world.map.length + tm->pos.x])
270 struct ThingType * tt = get_thing_type(tm->type);
283 static int16_t get_inventory_slot_to_consume(struct Thing * t_owner)
285 uint8_t compare_consumability = 0;
286 int16_t selection = -1;
287 struct Thing * t = t_owner->owns;;
289 for (i = 0; t; t = t->next, i++)
291 struct ThingType * tt = get_thing_type(t->type);
292 if (tt->consumable > compare_consumability)
294 compare_consumability = tt->consumable;
303 static uint8_t standing_on_consumable(struct Thing * t_standing)
305 struct Thing * t = world.things;
306 for (; t; t = t->next)
309 && t->pos.y == t_standing->pos.y && t->pos.x == t_standing->pos.x)
311 struct ThingType * tt = get_thing_type(t->type);
323 extern void ai(struct Thing * t)
325 t->command = get_thing_action_id_by_name(s[S_CMD_WAIT]);
326 if (!get_dir_to_nearest_target(t, 'e'))
328 int16_t sel = get_inventory_slot_to_consume(t);
331 t->command = get_thing_action_id_by_name(s[S_CMD_USE]);
332 t->arg = (uint8_t) sel;
334 else if (standing_on_consumable(t))
336 t->command = get_thing_action_id_by_name(s[S_CMD_PICKUP]);
338 else if (!get_dir_to_nearest_target(t, 'c'))
340 get_dir_to_nearest_target(t, 's');