X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=libplomrogue.c;fp=libplomrogue.c;h=0000000000000000000000000000000000000000;hb=b110bc1052585df1b8b67c784e0b53104a73dafc;hp=9a4e69a7cdd2158374b16a77102a41b46b69798e;hpb=1ad4d94b467e6657a487b0cfe530661f0df81c20;p=plomrogue diff --git a/libplomrogue.c b/libplomrogue.c deleted file mode 100644 index 9a4e69a..0000000 --- a/libplomrogue.c +++ /dev/null @@ -1,599 +0,0 @@ -#include /* pow() */ -#include /* NULL */ -#include /* ?(u)int(8|16|32)_t, ?(U)INT8_(MIN|MAX) */ -#include /* free, malloc */ -#include /* memset */ - -/* Number of degrees a circle is divided into. The greater it is, the greater - * the angle precision. But make it one whole zero larger and bizarre FOV bugs - * appear on large maps, probably due to value overflows (TODO: more research!). - */ -#define CIRCLE 3600000 - -/* Angle of a shadow. */ -struct shadow_angle -{ - struct shadow_angle * next; - uint32_t left_angle; - uint32_t right_angle; -}; - -/* To be used as temporary storage for world map array. */ -static char * worldmap = NULL; - -/* Coordinate for maps of max. 256x256 cells. */ -struct yx_uint8 -{ - uint8_t y; - uint8_t x; -}; - -/* Storage for map_length, set by set_maplength(). */ -static uint16_t maplength = 0; -extern void set_maplength(uint16_t maplength_input) -{ - maplength = maplength_input; -} - -/* Pseudo-randomness seed for rrand(), set by seed_rrand(). */ -static uint32_t seed = 0; - -/* Helper to mv_yx_in_dir_legal(). Move "yx" into hex direction "d". */ -static void mv_yx_in_dir(char d, struct yx_uint8 * yx) -{ - if (d == 'e') - { - yx->x = yx->x + (yx->y % 2); - yx->y--; - } - else if (d == 'd') - { - yx->x++; - } - else if (d == 'c') - { - yx->x = yx->x + (yx->y % 2); - yx->y++; - } - else if (d == 'x') - { - yx->x = yx->x - !(yx->y % 2); - yx->y++; - } - else if (d == 's') - { - yx->x--; - } - else if (d == 'w') - { - yx->x = yx->x - !(yx->y % 2); - yx->y--; - } -} - -/* Move "yx" into hex direction "dir". Available hex directions are: 'e' - * (north-east), 'd' (east), 'c' (south-east), 'x' (south-west), 's' (west), 'w' - * (north-west). Returns 1 if the move was legal, 0 if not, and -1 when internal - * wrapping limits were exceeded. - * - * A move is legal if "yx" ends up within the the map and the original wrap - * space. The latter is left to a neighbor wrap space if "yx" moves beyond the - * minimal (0) or maximal (UINT8_MAX) column or row of possible map space – in - * which case "yx".y or "yx".x will snap to the respective opposite side. The - * current wrapping state is kept between successive calls until a "yx" of NULL - * is passed, in which case the function does nothing but zero the wrap state. - * Successive wrapping may move "yx" several wrap spaces into either direction, - * or return it into the original wrap space. - */ -static int8_t mv_yx_in_dir_legal(char dir, struct yx_uint8 * yx) -{ - static int8_t wrap_west_east = 0; - static int8_t wrap_north_south = 0; - if (!yx) - { - wrap_west_east = wrap_north_south = 0; - return 0; - } - if ( INT8_MIN == wrap_west_east || INT8_MIN == wrap_north_south - || INT8_MAX == wrap_west_east || INT8_MAX == wrap_north_south) - { - return -1; - } - struct yx_uint8 original = *yx; - mv_yx_in_dir(dir, yx); - if (('e' == dir || 'd' == dir || 'c' == dir) && yx->x < original.x) - { - wrap_west_east++; - } - else if (('x' == dir || 's' == dir || 'w' == dir) && yx->x > original.x) - { - wrap_west_east--; - } - if (('w' == dir || 'e' == dir) && yx->y > original.y) - { - wrap_north_south--; - } - else if (('x' == dir || 'c' == dir) && yx->y < original.y) - { - wrap_north_south++; - } - if ( !wrap_west_east && !wrap_north_south - && yx->x < maplength && yx->y < maplength) - { - return 1; - } - return 0; -} - -/* Wrapper around mv_yx_in_dir_legal() that stores new coordinate in res_y/x, - * (return with result_y/x()), and immediately resets the wrapping. - */ -static uint8_t res_y = 0; -static uint8_t res_x = 0; -extern uint8_t mv_yx_in_dir_legal_wrap(char dir, uint8_t y, uint8_t x) -{ - struct yx_uint8 yx; - yx.y = y; - yx.x = x; - uint8_t result = mv_yx_in_dir_legal(dir, &yx); - mv_yx_in_dir_legal(0, NULL); - res_y = yx.y; - res_x = yx.x; - return result; -} -extern uint8_t result_y() -{ - return res_y; -} -extern uint8_t result_x() -{ - return res_x; -} - -/* With set_seed set, set seed global to seed_input. In any case, return it. */ -extern uint32_t seed_rrand(uint8_t set_seed, uint32_t seed_input) -{ - if (set_seed) - { - seed = seed_input; - } - return seed; -} - -/* Return 16-bit number pseudo-randomly generated via Linear Congruential - * Generator algorithm with some proven constants. Use instead of any rand() to - * ensure portability of the same pseudo-randomness across systems. - */ -extern uint16_t rrand() -{ /* Constants as recommended by POSIX.1-2001 (see man page rand(3)). */ - seed = ((seed * 1103515245) + 12345) % 4294967296; - return (seed >> 16); /* Ignore less random least significant bits. */ -} - -/* Free shadow angles list "angles". */ -static void free_angles(struct shadow_angle * angles) -{ - if (angles->next) - { - free_angles(angles->next); - } - free(angles); -} - -/* Recalculate angle < 0 or > CIRCLE to a value between these two limits. */ -static uint32_t correct_angle(int32_t angle) -{ - while (angle < 0) - { - angle = angle + CIRCLE; - } - while (angle > CIRCLE) - { - angle = angle - CIRCLE; - } - return angle; -} - -/* Try merging the angle between "left_angle" and "right_angle" to "shadow" if - * it meets the shadow from the right or the left. Returns 1 on success, else 0. - */ -static uint8_t try_merge(struct shadow_angle * shadow, - uint32_t left_angle, uint32_t right_angle) -{ - if ( shadow->right_angle <= left_angle + 1 - && shadow->right_angle >= right_angle) - { - shadow->right_angle = right_angle; - } - else if ( shadow->left_angle + 1 >= right_angle - && shadow->left_angle <= left_angle) - { - shadow->left_angle = left_angle; - } - else - { - return 0; - } - return 1; -} - -/* Try merging the shadow angle between "left_angle" and "right_angle" into an - * existing shadow angle in "shadows". On success, see if this leads to any - * additional shadow angle overlaps and merge these accordingly. Return 1 on - * success, else 0. - */ -static uint8_t try_merging_angles(uint32_t left_angle, uint32_t right_angle, - struct shadow_angle ** shadows) -{ - uint8_t angle_merge = 0; - struct shadow_angle * shadow; - for (shadow = *shadows; shadow; shadow = shadow->next) - { - if (try_merge(shadow, left_angle, right_angle)) - { - angle_merge = 1; - } - } - if (angle_merge) - { - struct shadow_angle * shadow1; - for (shadow1 = *shadows; shadow1; shadow1 = shadow1->next) - { - struct shadow_angle * last_shadow = NULL; - struct shadow_angle * shadow2; - for (shadow2 = *shadows; shadow2; shadow2 = shadow2->next) - { - if ( shadow1 != shadow2 - && try_merge(shadow1, shadow2->left_angle, - shadow2->right_angle)) - { - struct shadow_angle * to_free = shadow2; - if (last_shadow) - { - last_shadow->next = shadow2->next; - shadow2 = last_shadow; - } - else - { - *shadows = shadow2->next; - shadow2 = *shadows; - } - free(to_free); - } - last_shadow = shadow2; - } - } - } - return angle_merge; -} - -/* To "shadows", add shadow defined by "left_angle" and "right_angle", either as - * new entry or as part of an existing shadow (swallowed whole or extending it). - * Return 1 on malloc error, else 0. - */ -static uint8_t set_shadow(uint32_t left_angle, uint32_t right_angle, - struct shadow_angle ** shadows) -{ - struct shadow_angle * shadow_i; - if (!try_merging_angles(left_angle, right_angle, shadows)) - { - struct shadow_angle * shadow; - shadow = malloc(sizeof(struct shadow_angle)); - if (!shadow) - { - return 1; - } - shadow->left_angle = left_angle; - shadow->right_angle = right_angle; - shadow->next = NULL; - if (*shadows) - { - for (shadow_i = *shadows; shadow_i; shadow_i = shadow_i->next) - { - if (!shadow_i->next) - { - shadow_i->next = shadow; - return 0; - } - } - } - *shadows = shadow; - } - return 0; -} - -/* Test whether angle between "left_angle" and "right_angle", or at least - * "middle_angle", is captured inside one of the shadow angles in "shadows". If - * so, set hex in "fov_map" indexed by "pos_in_map" to 'H'. If the whole angle - * and not just "middle_angle" is captured, return 1. Any other case: 0. - */ -static uint8_t shade_hex(uint32_t left_angle, uint32_t right_angle, - uint32_t middle_angle, struct shadow_angle ** shadows, - uint16_t pos_in_map, char * fov_map) -{ - struct shadow_angle * shadow_i; - if (fov_map[pos_in_map] == 'v') - { - for (shadow_i = *shadows; shadow_i; shadow_i = shadow_i->next) - { - if ( left_angle <= shadow_i->left_angle - && right_angle >= shadow_i->right_angle) - { - fov_map[pos_in_map] = 'H'; - return 1; - } - if ( middle_angle < shadow_i->left_angle - && middle_angle > shadow_i->right_angle) - { - fov_map[pos_in_map] = 'H'; - } - } - } - return 0; -} - -/* Evaluate map position "test_pos" in distance "dist" to the view origin, and - * on the circle of that distance to the origin on hex "hex_i" (as counted from - * the circle's rightmost point), for setting shaded hexes in "fov_map" and - * potentially adding a new shadow to linked shadow angle list "shadows". - * Return 1 on malloc error, else 0. - */ -static uint8_t eval_position(uint16_t dist, uint16_t hex_i, char * fov_map, - struct yx_uint8 * test_pos, - struct shadow_angle ** shadows) -{ - int32_t left_angle_uncorrected = ((CIRCLE / 12) / dist) - - (hex_i * (CIRCLE / 6) / dist); - int32_t right_angle_uncorrected = left_angle_uncorrected - - (CIRCLE / (6 * dist)); - uint32_t left_angle = correct_angle(left_angle_uncorrected); - uint32_t right_angle = correct_angle(right_angle_uncorrected); - uint32_t right_angle_1st = right_angle > left_angle ? 0 : right_angle; - uint32_t middle_angle = 0; - if (right_angle_1st) - { - middle_angle = right_angle + ((left_angle - right_angle) / 2); - } - uint16_t pos_in_map = test_pos->y * maplength + test_pos->x; - uint8_t all_shaded = shade_hex(left_angle, right_angle_1st, middle_angle, - shadows, pos_in_map, fov_map); - if (!all_shaded && 'X' == worldmap[pos_in_map]) - { - if (set_shadow(left_angle, right_angle_1st, shadows)) - { - return 1; - } - if (right_angle_1st != right_angle) - { - left_angle = CIRCLE; - if (set_shadow(left_angle, right_angle, shadows)) - { - return 1; - } - } - } - return 0; -} - -/* Update field of view in "fovmap" of "worldmap_input" as seen from "y"/"x". - * Return 1 on malloc error, else 0. - */ -extern uint8_t build_fov_map(uint8_t y, uint8_t x, - char * fovmap, char * worldmap_input) -{ - worldmap = worldmap_input; - struct shadow_angle * shadows = NULL; - struct yx_uint8 test_pos; - test_pos.y = y; - test_pos.x = x; - char * circledirs_string = "xswedc"; - uint16_t circle_i; - uint8_t circle_is_on_map; - for (circle_i = 1, circle_is_on_map = 1; circle_is_on_map; circle_i++) - { - circle_is_on_map = 0; - if (1 < circle_i) /* All circles but the 1st are */ - { /* moved into starting from a */ - mv_yx_in_dir_legal('c', &test_pos);/* previous circle's last hex, */ - } /* i.e. from the upper left. */ - char dir_char = 'd'; /* Circle's 1st hex is entered by rightward move.*/ - uint8_t dir_char_pos_in_circledirs_string = UINT8_MAX; - uint16_t dist_i, hex_i; - for (hex_i=0, dist_i=circle_i; hex_i < 6 * circle_i; dist_i++, hex_i++) - { - if (circle_i < dist_i) - { - dist_i = 1; - dir_char=circledirs_string[++dir_char_pos_in_circledirs_string]; - } - if (mv_yx_in_dir_legal(dir_char, &test_pos)) - { - if (eval_position(circle_i, hex_i, fovmap, &test_pos, &shadows)) - { - return 1; - } - circle_is_on_map = 1; - } - } - } - mv_yx_in_dir_legal(0, NULL); - free_angles(shadows); - return 0; -} - -static uint16_t * score_map = NULL; -static uint16_t neighbor_scores[6]; - -/* Init AI score map. Return 1 on failure, else 0. */ -extern uint8_t init_score_map() -{ - uint32_t map_size = maplength * maplength; - score_map = malloc(map_size * sizeof(uint16_t)); - if (!score_map) - { - return 1; - } - uint32_t i = 0; - for (; i < map_size; i++) - { - score_map[i] = UINT16_MAX; - } - return 0; -} - -/* Set score_map[pos] to score. Return 1 on failure, else 0. */ -extern uint8_t set_map_score(uint16_t pos, uint16_t score) -{ - if (!score_map) - { - return 1; - } - score_map[pos] = score; - return 0; -} - -/* Get score_map[pos]. Return uint16_t value on success, -1 on failure. */ -extern int32_t get_map_score(uint16_t pos) -{ - if (!score_map) - { - return -1; - } - return score_map[pos]; -} - -/* Free score_map. */ -extern void free_score_map() -{ - free(score_map); - score_map = NULL; -} - -/* Write into "neighbors" scores of the immediate neighbors of the score_map - * cell at pos_i (array index), as found in the directions north-east, east, - * south-east etc. (clockwise order). Use kill_score for illegal neighborhoods - * (i.e. if direction would lead beyond the map's border). - */ -static void get_neighbor_scores(uint16_t pos_i, uint16_t kill_score, - uint16_t * neighbors) -{ - uint32_t map_size = maplength * maplength; - uint8_t open_north = pos_i >= maplength; - uint8_t open_east = pos_i + 1 % maplength; - uint8_t open_south = pos_i + maplength < map_size; - uint8_t open_west = pos_i % maplength; - uint8_t is_indented = (pos_i / maplength) % 2; - uint8_t open_diag_west = is_indented || open_west; - uint8_t open_diag_east = !is_indented || open_east; - neighbors[0] = !(open_north && open_diag_east) ? kill_score : - score_map[pos_i - maplength + is_indented]; - neighbors[1] = !(open_east) ? kill_score : score_map[pos_i + 1]; - neighbors[2] = !(open_south && open_diag_east) ? kill_score : - score_map[pos_i + maplength + is_indented]; - neighbors[3] = !(open_south && open_diag_west) ? kill_score : - score_map[pos_i + maplength - !is_indented]; - neighbors[4] = !(open_west) ? kill_score : score_map[pos_i - 1]; - neighbors[5] = !(open_north && open_diag_west) ? kill_score : - score_map[pos_i - maplength - !is_indented]; -} - -/* Call get_neighbor_scores() on neighbor_scores buffer. Return 1 on error. */ -extern uint8_t ready_neighbor_scores(uint16_t pos) -{ - if (!score_map) - { - return 1; - } - get_neighbor_scores(pos, UINT16_MAX, neighbor_scores); - return 0; -} - -/* Return i-th position from neighbor_scores buffer.*/ -extern uint16_t get_neighbor_score(uint8_t i) -{ - return neighbor_scores[i]; -} - -/* Iterate over scored cells in score_map geometry. Compare each cell's score - * against the score of its immediate neighbors in 6 directions. If any - * neighbor's score is at least two points lower than the current cell's score, - * re-set it to 1 point higher than its lowest-scored neighbor. Repeat this - * whole process until all cells have settled on their final score. Ignore cells - * whose score is greater than UINT16_MAX - 1 (treat those as unreachable). - * Return 1 on error, else 0. - */ -extern uint8_t dijkstra_map() -{ - if (!score_map) - { - return 1; - } - uint16_t max_score = UINT16_MAX - 1; - uint32_t map_size = maplength * maplength; - uint32_t pos; - uint16_t i_scans, neighbors[6], min_neighbor; - 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 = 0; pos < map_size; pos++) - { - if (score_map[pos] <= max_score) - { - get_neighbor_scores(pos, max_score, neighbors); - min_neighbor = max_score; - for (i_dirs = 0; i_dirs < 6; i_dirs++) - { - if (min_neighbor > neighbors[i_dirs]) - { - min_neighbor = neighbors[i_dirs]; - } - } - if (score_map[pos] > min_neighbor + 1) - { - score_map[pos] = min_neighbor + 1; - scores_still_changing = 1; - } - } - } - } - return 0; -} - -extern uint8_t zero_score_map_where_char_on_memdepthmap(char c, - char * memdepthmap) -{ - if (!score_map) - { - return 1; - } - uint32_t map_size = maplength * maplength; - uint16_t pos; - for (pos = 0; pos < map_size; pos++) - { - if (c == memdepthmap[pos]) - { - score_map[pos] = 0; - } - } - return 0; -} - -extern void age_some_memdepthmap_on_nonfov_cells(char * memdepthmap, - char * fovmap) -{ - uint32_t map_size = maplength * maplength; - uint16_t pos; - for (pos = 0; pos < map_size; pos++) - { - if ('v' != fovmap[pos]) - { - char c = memdepthmap[pos]; - if( '0' <= c && '9' > c && !(rrand() % (uint16_t) pow(2, c - 48))) - { - memdepthmap[pos]++; - } - } - } -}