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_thing() 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 thing that is not "t_eye" and fits criteria set by "filter". On
47 * success, return 1, 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.
52 static uint8_t get_dir_to_nearest_thing(struct Thing * t_eye, char filter);
54 /* Return 1 if any thing not "t_eye" is known and fulfills some criteria defined
55 * by "filter", else 0. Values for "filter":
56 * "e": thing in FOV is animate, but not of "t_eye"'s thing type
57 * "c": thing in memorized map is consumable
59 static uint8_t seeing_thing(struct Thing * t_eye, char filter);
61 /* Return slot ID of strongest consumable in "t_owner"'s inventory, else -1. */
62 static int16_t get_inventory_slot_to_consume(struct Thing * t_owner);
64 /* Return 1 if "t_standing" is standing on a consumable, else 0. */
65 static uint8_t standing_on_consumable(struct Thing * t_standing);
69 static void get_neighbor_scores(uint16_t * score_map, uint16_t pos_i,
70 uint16_t max_score, uint16_t * neighbors)
72 uint32_t map_size = world.map.length * world.map.length;
74 for (i_dir = 0; i_dir < N_DIRS; neighbors[i_dir] = max_score, i_dir++);
75 uint8_t open_north = pos_i >= world.map.length;
76 uint8_t open_east = pos_i + 1 % world.map.length;
77 uint8_t open_south = pos_i + world.map.length < map_size;
78 uint8_t open_west = pos_i % world.map.length;
79 uint8_t is_indented = (pos_i / world.map.length) % 2;
80 uint8_t open_diag_west = is_indented || open_west;
81 uint8_t open_diag_east = !is_indented || open_east;
82 if (open_north && open_diag_east)
84 neighbors[0] = score_map[pos_i - world.map.length + is_indented];
88 neighbors[1] = score_map[pos_i + 1];
90 if (open_south && open_diag_east)
92 neighbors[2] = score_map[pos_i + world.map.length + is_indented];
94 if (open_south && open_diag_west)
96 neighbors[3] = score_map[pos_i + world.map.length - !is_indented];
100 neighbors[4] = score_map[pos_i - 1];
102 if (open_north && open_diag_west)
104 neighbors[5] = score_map[pos_i - world.map.length - !is_indented];
110 static void dijkstra_map(uint16_t * score_map, uint16_t max_score)
112 uint32_t map_size = world.map.length * world.map.length;
114 uint16_t i_scans, neighbors[N_DIRS], min_neighbor;
115 uint8_t scores_still_changing = 1;
117 for (i_scans = 0; scores_still_changing; i_scans++)
119 scores_still_changing = 0;
120 for (pos = 0; pos < map_size; pos++)
122 if (score_map[pos] <= max_score)
124 get_neighbor_scores(score_map, pos, max_score, neighbors);
125 min_neighbor = max_score;
126 for (i_dirs = 0; i_dirs < N_DIRS; i_dirs++)
128 if (min_neighbor > neighbors[i_dirs])
130 min_neighbor = neighbors[i_dirs];
133 if (score_map[pos] > min_neighbor + 1)
135 score_map[pos] = min_neighbor + 1;
136 scores_still_changing = 1;
145 static void init_score_map(char filter, uint16_t * score_map, uint32_t map_size,
146 struct Thing * t_eye)
149 for (i = 0; i < map_size; i++)
151 score_map[i] = UINT16_MAX;
152 if ('.' == t_eye->mem_map[i])
154 score_map[i] = UINT16_MAX-1;
159 struct Thing * t = world.things;
160 for (; t; t = t->next)
162 if ( t==t_eye || !t->lifepoints
163 || 'H' == t_eye->fov_map[t->pos.y*world.map.length + t->pos.x])
167 else if (t->lifepoints && t->type == t_eye->type)
169 score_map[t->pos.y * world.map.length + t->pos.x] = UINT16_MAX;
172 score_map[t->pos.y * world.map.length + t->pos.x] = 0;
175 else if ('c' == filter)
177 struct ThingInMemory * tm = t_eye->t_mem;
178 for (; tm; tm = tm->next)
180 if (' ' == t_eye->mem_map[tm->pos.y * world.map.length + tm->pos.x])
184 struct ThingType * tt = get_thing_type(tm->type);
189 score_map[tm->pos.y * world.map.length + tm->pos.x] = 0;
196 static uint8_t get_dir_to_nearest_thing(struct Thing * t_eye, char filter)
198 char dir_to_nearest_thing = 0;
199 if (seeing_thing(t_eye, filter))
201 uint32_t map_size = world.map.length * world.map.length;
202 uint16_t * score_map = try_malloc(map_size * sizeof(uint16_t),__func__);
203 init_score_map(filter, score_map, map_size, t_eye);
204 dijkstra_map(score_map, UINT16_MAX-1);
205 uint16_t neighbors[N_DIRS];
206 uint16_t pos_i = (t_eye->pos.y * world.map.length) + t_eye->pos.x;
207 get_neighbor_scores(score_map, pos_i, UINT16_MAX-1, neighbors);
209 uint16_t min_neighbor = UINT16_MAX-1;
210 char * dirs = "edcxsw";/* get_neighbor_scores()'s clockwise dir order.*/
212 for (i = 0; i < N_DIRS; i++)
214 if (min_neighbor > neighbors[i])
216 min_neighbor = neighbors[i];
217 dir_to_nearest_thing = dirs[i];
221 if (dir_to_nearest_thing)
223 t_eye->command = get_thing_action_id_by_name(s[S_CMD_MOVE]);
224 t_eye->arg = dir_to_nearest_thing;
232 static uint8_t seeing_thing(struct Thing * t_eye, char filter)
234 if (t_eye->fov_map && 'e' == filter)
236 struct Thing * t = world.things;
237 for (; t; t = t->next)
240 && 'v' == t_eye->fov_map[t->pos.y*world.map.length + t->pos.x])
242 if (t->lifepoints && t->type != t_eye->type)
249 else if (t_eye->mem_map && 'c' == filter)
251 struct ThingInMemory * tm = t_eye->t_mem;
252 for (; tm; tm = tm->next)
254 if (' ' != t_eye->mem_map[tm->pos.y * world.map.length + tm->pos.x])
256 struct ThingType * tt = get_thing_type(tm->type);
269 static int16_t get_inventory_slot_to_consume(struct Thing * t_owner)
271 uint8_t compare_consumability = 0;
272 int16_t selection = -1;
273 struct Thing * t = t_owner->owns;;
275 for (i = 0; t; t = t->next, i++)
277 struct ThingType * tt = get_thing_type(t->type);
278 if (tt->consumable > compare_consumability)
280 compare_consumability = tt->consumable;
289 static uint8_t standing_on_consumable(struct Thing * t_standing)
291 struct Thing * t = world.things;
292 for (; t; t = t->next)
295 && t->pos.y == t_standing->pos.y && t->pos.x == t_standing->pos.x)
297 struct ThingType * tt = get_thing_type(t->type);
309 extern void ai(struct Thing * t)
311 t->command = get_thing_action_id_by_name(s[S_CMD_WAIT]);
312 if (!get_dir_to_nearest_thing(t, 'e'))
314 int16_t sel = get_inventory_slot_to_consume(t);
317 t->command = get_thing_action_id_by_name(s[S_CMD_USE]);
318 t->arg = (uint8_t) sel;
320 else if (standing_on_consumable(t))
322 t->command = get_thing_action_id_by_name(s[S_CMD_PICKUP]);
326 get_dir_to_nearest_thing(t, 'c');