X-Git-Url: https://plomlompom.com/repos/?p=plomrogue;a=blobdiff_plain;f=libplomrogue.c;h=9f872e1d406158f3a77920de025e6bd9309752c9;hp=c6f572416339559cfdfbb35ee7a25a2d64377092;hb=HEAD;hpb=659685982349318d6aaa271259fef324dd5c8d30 diff --git a/libplomrogue.c b/libplomrogue.c index c6f5724..9f872e1 100644 --- a/libplomrogue.c +++ b/libplomrogue.c @@ -1,11 +1,154 @@ -#include /* uint16_t, uint32_t */ +#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) @@ -17,8 +160,6 @@ extern uint32_t seed_rrand(uint8_t set_seed, uint32_t 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. @@ -28,3 +169,492 @@ extern uint16_t rrand() 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, + const char * symbols_obstacle) +{ + 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 && NULL != strchr(symbols_obstacle, 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, + const char * symbols_obstacle) +{ + 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, + symbols_obstacle)) + { + 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). Also + * ignore cells whose score is smaller or equal the number of past iterations. + * 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++) + { + uint16_t score = score_map[pos]; + if (score <= max_score && score > i_scans) + { + 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]++; + } + } + } +} + +extern uint8_t set_cells_passable_on_memmap_to_65534_on_scoremap(char * mem_map, + const char * symbols_passable) +{ + if (!score_map) + { + return 1; + } + uint32_t map_size = maplength * maplength; + uint16_t pos; + for (pos = 0; pos < map_size; pos++) + { + if (NULL != strchr(symbols_passable, mem_map[pos])) + { + score_map[pos] = 65534; + } + } + return 0; +} + + +extern void update_mem_and_memdepthmap_via_fovmap(char * map, char * fovmap, + char * memdepthmap, + char * memmap) +{ + uint32_t map_size = maplength * maplength; + uint16_t pos; + for (pos = 0; pos < map_size; pos++) + { + if ('v' == fovmap[pos]) + { + memdepthmap[pos] = '0'; + memmap[pos] = map[pos]; + } + } +} + +/* USEFUL FOR DEBUGGING +#include +extern void write_score_map() +{ + FILE *f = fopen("score_map", "a"); + + fprintf(f, "\n---------------------------------------------------------\n"); + uint32_t y, x; + for (y = 0; y < maplength; y++) + { + for (x = 0; x < maplength; x++) + { + fprintf(f, "%2X", score_map[y * maplength + x] % 256); + } + fprintf(f, "\n"); + } + fclose(f); +} +*/