X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Fserver%2Fai.c;h=50c5031018810d5baca6348299e394ae5329cb98;hb=e03020342a74aef143b1ec38c18966dac64181b5;hp=6c45571aed8c0112ba6c91f537de00f17a64c9ba;hpb=0255432b4e8d3a7b3aec71c4e43e7fb063c45833;p=plomrogue diff --git a/src/server/ai.c b/src/server/ai.c index 6c45571..50c5031 100644 --- a/src/server/ai.c +++ b/src/server/ai.c @@ -1,110 +1,130 @@ /* src/server/ai.c */ #include "ai.h" -#include /* uint8_t, uint32_t, UINT8_MAX */ -#include /* strlen(), memset() */ -#include "../common/yx_uint16.h" /* struct yx_uint16 */ +#include /* NULL */ +#include /* uint8_t, uint16_t, uint32_t, UINT16_MAX */ #include "map_object_actions.h" /* get_moa_id_by_name() */ #include "map_objects.h" /* struct MapObj */ #include "world.h" /* global world */ -/* Write into "neighbor_scores" scores for immediate neighbors to cell at - * "pos_yx" (YX coordinates) and "pos_i" (arry_index) in "score_map". Directions - * determining neighborhood are defined by the letters of "dir"; their order - * also determines in what order scores are written into "neighbor_score". - * "len_dirs" is to store the result of a previous strlen(dir) (so it does not - * have to be called repeatedly and costly in dijkstra_map(); same reason for - * "pos_i"'s redundancy.). "max_score" is written into "neighbor_scores" for - * illegal directions (that from "pos_yx" would lead beyond the map's border). +#define N_DIRS 8 + + + +/* Write into "neighbors" scores of the eight immediate 2D neighbors of the + * "score_map" cell at "pos_i" (array index), as found in the directions north, + * north-east, east etc. (clockwise order). "max_score" is used for illegal + * neighborhoods (i.e. if the direction would lead beyond the map's border). */ -static void get_neighbor_scores(char * dirs, uint8_t len_dirs, - uint8_t * score_map, struct yx_uint16 pos_yx, - uint32_t pos_i, uint8_t max_score, - uint8_t * neighbor_scores); +static void get_neighbor_scores(uint32_t * score_map, uint16_t pos_i, + uint32_t max_score, uint32_t * neighbors); /* Iterate over scored cells in "score_map" of world.map's 2D geometry. Compare - * each cell's score against the scores of its immediate neighbors in "dirs" - * directions; if at least one of these is lower, re-set the current cell's - * score to one higher than its lowest neighbor score. Repeat this whole process - * until all cells have settled on their final score. Ignore cells whose - * position in "score_map" fits a non-island cell in world.map.cells. Expect - * "max_score" to be the maximum score for cells, marking them as unreachable. + * each cell's score against the score of its immediate neighbors in N_DIRS + * directions. If it's neighbors are low enough that the result would be lower + * than the current value, re-set it to world.map.dist_orthogonal points higher + * than its lowest-scored orthogonal neighbor or world.map.dist_diagonal points + * higher than its lowest-scored diagonal neighbor (whatever would result in a + * lower value). Repeat this whole process until all cells have settled on their + * final score. Ignore cells whose position in "score_map" fits cells of + * unreachable terrain in world.map.cells. Expect "max_score" to be the maximum + * score for cells, marking them as unreachable. */ -static void dijkstra_map(char * dirs, uint8_t * score_map, uint8_t max_score); +static void dijkstra_map(uint32_t * score_map, uint32_t max_score); -/* Return char of direction ("N", "E", "S" or "W") of enemy with the shortest - * path to "mo_target". If no enemy is around, return 0. +/* Return numpad char of direction ("8", "6", "2", "4" etc.) of enemy with the + * shortest path to "mo_origin". If no enemy is around, return 0. */ -static char get_dir_to_nearest_enemy(struct MapObj * mo_target); +static char get_dir_to_nearest_enemy(struct MapObj * mo_origin); -static void get_neighbor_scores(char * dirs, uint8_t len_dirs, - uint8_t * score_map, struct yx_uint16 pos_yx, - uint32_t pos_i, uint8_t max_score, - uint8_t * neighbor_scores) +static void get_neighbor_scores(uint32_t * score_map, uint16_t pos_i, + uint32_t max_score, uint32_t * neighbors) { - memset(neighbor_scores, max_score, len_dirs); - uint8_t i_dirs; - for (i_dirs = 0; i_dirs < len_dirs; i_dirs++) + uint16_t map_size = world.map.size.y * world.map.size.x; + uint8_t i_dir; + for (i_dir = 0; i_dir < N_DIRS; neighbors[i_dir] = max_score, i_dir++); + uint8_t open_north = pos_i >= world.map.size.x; + uint8_t open_east = pos_i + 1 % world.map.size.x; + uint8_t open_south = pos_i + world.map.size.x < map_size; + uint8_t open_west = pos_i % world.map.size.x; + if (open_north) { - if ('N' == dirs[i_dirs] && pos_yx.y > 0) - { - neighbor_scores[i_dirs] = score_map[pos_i - world.map.size.x]; - } - else if ('E' == dirs[i_dirs] && pos_yx.x < world.map.size.x - 1) - { - neighbor_scores[i_dirs] = score_map[pos_i + 1]; - } - else if ('S' == dirs[i_dirs] && pos_yx.y < world.map.size.y - 1) - { - neighbor_scores[i_dirs] = score_map[pos_i + world.map.size.x]; - } - else if ('W' == dirs[i_dirs] && pos_yx.x > 0) - { - neighbor_scores[i_dirs] = score_map[pos_i - 1]; - } + neighbors[0] = score_map[pos_i - world.map.size.x]; + } + if (open_north && open_east) + { + neighbors[1] = score_map[pos_i - world.map.size.x + 1]; + } + if (open_east) + { + neighbors[2] = score_map[pos_i + 1]; + } + if (open_east && open_south) + { + neighbors[3] = score_map[pos_i + 1 + world.map.size.x]; + } + if (open_south) + { + neighbors[4] = score_map[pos_i + world.map.size.x]; + } + if (open_south && open_west) + { + neighbors[5] = score_map[pos_i + world.map.size.x - 1]; + } + if (open_west) + { + neighbors[6] = score_map[pos_i - 1]; + } + if (open_west && open_north) + { + neighbors[7] = score_map[pos_i - 1 - world.map.size.x]; } } -static void dijkstra_map(char * dirs, uint8_t * score_map, uint8_t max_score) +static void dijkstra_map(uint32_t * score_map, uint32_t max_score) { - uint8_t len_dirs = strlen(dirs); - uint8_t neighbor_scores[len_dirs]; - struct yx_uint16 pos_yx; - uint32_t pos_i; - uint8_t i_scans, i_dirs, local_score, min_neighbor_score; + uint32_t i_scans, neighbors[N_DIRS], min_neighbor_o, min_neighbor_d; + uint16_t map_size = world.map.size.y * world.map.size.x; + uint16_t pos; uint8_t scores_still_changing = 1; + uint8_t i_dirs; for (i_scans = 0; scores_still_changing; i_scans++) { scores_still_changing = 0; - for (pos_yx.y = 0, pos_i = 0; pos_yx.y < world.map.size.y; pos_yx.y++) + for (pos = 0; pos < map_size; pos++) { - for (pos_yx.x = 0; pos_yx.x < world.map.size.x; pos_yx.x++, pos_i++) + if ('.' == world.map.cells[pos]) { - if ('.' == world.map.cells[pos_i]) + get_neighbor_scores(score_map, pos, max_score, neighbors); + min_neighbor_d = max_score; + min_neighbor_o = max_score; + for (i_dirs = 0; i_dirs < N_DIRS; i_dirs++) { - local_score = score_map[pos_i]; - get_neighbor_scores(dirs, len_dirs, score_map, pos_yx, - pos_i, max_score, neighbor_scores); - min_neighbor_score = max_score; - for (i_dirs = 0; i_dirs < len_dirs; i_dirs++) + if (!(i_dirs % 2) && min_neighbor_o > neighbors[i_dirs]) { - if (min_neighbor_score > neighbor_scores[i_dirs]) - { - min_neighbor_score = neighbor_scores[i_dirs]; - } + min_neighbor_o = neighbors[i_dirs]; } - if (local_score > min_neighbor_score + 1) + else if (i_dirs % 2 && min_neighbor_d > neighbors[i_dirs]) { - score_map[pos_i] = min_neighbor_score + 1; - scores_still_changing = 1; + min_neighbor_d = neighbors[i_dirs]; } } + if (score_map[pos] > min_neighbor_o + world.map.dist_orthogonal) + { + score_map[pos] = min_neighbor_o + world.map.dist_orthogonal; + scores_still_changing = 1; + } + if (score_map[pos] > min_neighbor_d + world.map.dist_diagonal) + { + score_map[pos] = min_neighbor_d + world.map.dist_diagonal; + scores_still_changing = 1; + } } } } @@ -112,42 +132,44 @@ static void dijkstra_map(char * dirs, uint8_t * score_map, uint8_t max_score) -static char get_dir_to_nearest_enemy(struct MapObj * mo_target) +static char get_dir_to_nearest_enemy(struct MapObj * mo_origin) { /* Calculate for each cell the distance to the nearest map actor that is - * not "mo_target", with movement only possible in the directions of "dir". + * not "mo_origin", with movement only possible in the directions of "dir". * (Actors' own cells start with a distance of 0 towards themselves.) */ - uint8_t max_score = UINT8_MAX; /* Score for cells treated as unreachable. */ - char * dirs = "NESW"; - uint8_t score_map[world.map.size.y * world.map.size.x]; - memset(score_map, max_score, world.map.size.y * world.map.size.x); + uint16_t map_size = world.map.size.y * world.map.size.x; + uint32_t max_score = UINT32_MAX - (world.map.dist_diagonal + 1); + uint32_t score_map[map_size]; + uint32_t i; + for (i = 0; i < map_size; i++) + { + score_map[i] = max_score; + } struct MapObj * mo = world.map_objs; for (; mo != NULL; mo = mo->next) { - if (!mo->lifepoints || mo == mo_target) + if (!mo->lifepoints || mo == mo_origin) { continue; } score_map[(mo->pos.y * world.map.size.x) + mo->pos.x] = 0; } - dijkstra_map(dirs, score_map, max_score); - - /* Return direction of "mo_target"'s lowest-scored neighbor cell. */ - uint8_t len_dirs = strlen(dirs); - uint32_t pos_i = (mo_target->pos.y * world.map.size.x) + mo_target->pos.x; - uint8_t neighbor_scores[len_dirs]; - get_neighbor_scores(dirs, len_dirs, score_map, mo_target->pos, pos_i, - max_score, neighbor_scores); + dijkstra_map(score_map, max_score); + + /* Return direction of "mo_origin"'s lowest-scored neighbor cell. */ + uint32_t neighbors[N_DIRS]; + uint16_t pos_i = (mo_origin->pos.y * world.map.size.x) + mo_origin->pos.x; + get_neighbor_scores(score_map, pos_i, max_score, neighbors); char dir_to_nearest_enemy = 0; - uint8_t min_neighbor_score = max_score; - uint8_t i_dirs; - for (i_dirs = 0; i_dirs < len_dirs; i_dirs++) + uint32_t min_neighbor = max_score; + char * dirs = "89632147"; /* get_neighbor_scores()'s clockwise dir order.*/ + for (i = 0; i < N_DIRS; i++) { - if (min_neighbor_score > neighbor_scores[i_dirs]) + if (min_neighbor > neighbors[i]) { - min_neighbor_score = neighbor_scores[i_dirs]; - dir_to_nearest_enemy = dirs[i_dirs]; + min_neighbor = neighbors[i]; + dir_to_nearest_enemy = dirs[i]; } } return dir_to_nearest_enemy;