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[hengband/hengband.git] / src / generate.c

/* File: generate.c */

/*
 * Copyright (c) 1997 Ben Harrison, James E. Wilson, Robert A. Koeneke
 *
 * This software may be copied and distributed for educational, research,
 * and not for profit purposes provided that this copyright and statement
 * are included in all such copies.  Other copyrights may also apply.
 */

/* Purpose: Dungeon generation */

/*
 * Note that Level generation is *not* an important bottleneck,
 * though it can be annoyingly slow on older machines...  Thus
 * we emphasize "simplicity" and "correctness" over "speed".
 *
 * This entire file is only needed for generating levels.
 * This may allow smart compilers to only load it when needed.
 *
 * Consider the "v_info.txt" file for vault generation.
 *
 * In this file, we use the "special" granite and perma-wall sub-types,
 * where "basic" is normal, "inner" is inside a room, "outer" is the
 * outer wall of a room, and "solid" is the outer wall of the dungeon
 * or any walls that may not be pierced by corridors.  Thus the only
 * wall type that may be pierced by a corridor is the "outer granite"
 * type.  The "basic granite" type yields the "actual" corridors.
 *
 * Note that we use the special "solid" granite wall type to prevent
 * multiple corridors from piercing a wall in two adjacent locations,
 * which would be messy, and we use the special "outer" granite wall
 * to indicate which walls "surround" rooms, and may thus be "pierced"
 * by corridors entering or leaving the room.
 *
 * Note that a tunnel which attempts to leave a room near the "edge"
 * of the dungeon in a direction toward that edge will cause "silly"
 * wall piercings, but will have no permanently incorrect effects,
 * as long as the tunnel can *eventually* exit from another side.
 * And note that the wall may not come back into the room by the
 * hole it left through, so it must bend to the left or right and
 * then optionally re-enter the room (at least 2 grids away).  This
 * is not a problem since every room that is large enough to block
 * the passage of tunnels is also large enough to allow the tunnel
 * to pierce the room itself several times.
 *
 * Note that no two corridors may enter a room through adjacent grids,
 * they must either share an entryway or else use entryways at least
 * two grids apart.  This prevents "large" (or "silly") doorways.
 *
 * To create rooms in the dungeon, we first divide the dungeon up
 * into "blocks" of 11x11 grids each, and require that all rooms
 * occupy a rectangular group of blocks.  As long as each room type
 * reserves a sufficient number of blocks, the room building routines
 * will not need to check bounds.  Note that most of the normal rooms
 * actually only use 23x11 grids, and so reserve 33x11 grids.
 *
 * Note that the use of 11x11 blocks (instead of the old 33x11 blocks)
 * allows more variability in the horizontal placement of rooms, and
 * at the same time has the disadvantage that some rooms (two thirds
 * of the normal rooms) may be "split" by panel boundaries.  This can
 * induce a situation where a player is in a room and part of the room
 * is off the screen.  It may be annoying enough to go back to 33x11
 * blocks to prevent this visual situation.
 *
 * Note that the dungeon generation routines are much different (2.7.5)
 * and perhaps "DUN_ROOMS" should be less than 50.
 *
 * XXX XXX XXX Note that it is possible to create a room which is only
 * connected to itself, because the "tunnel generation" code allows a
 * tunnel to leave a room, wander around, and then re-enter the room.
 *
 * XXX XXX XXX Note that it is possible to create a set of rooms which
 * are only connected to other rooms in that set, since there is nothing
 * explicit in the code to prevent this from happening.  But this is less
 * likely than the "isolated room" problem, because each room attempts to
 * connect to another room, in a giant cycle, thus requiring at least two
 * bizarre occurances to create an isolated section of the dungeon.
 *
 * Note that (2.7.9) monster pits have been split into monster "nests"
 * and monster "pits".  The "nests" have a collection of monsters of a
 * given type strewn randomly around the room (jelly, animal, or undead),
 * while the "pits" have a collection of monsters of a given type placed
 * around the room in an organized manner (orc, troll, giant, dragon, or
 * demon).  Note that both "nests" and "pits" are now "level dependant",
 * and both make 16 "expensive" calls to the "get_mon_num()" function.
 *
 * Note that the cave grid flags changed in a rather drastic manner
 * for Angband 2.8.0 (and 2.7.9+), in particular, dungeon terrain
 * features, such as doors and stairs and traps and rubble and walls,
 * are all handled as a set of 64 possible "terrain features", and
 * not as "fake" objects (440-479) as in pre-2.8.0 versions.
 *
 * The 64 new "dungeon features" will also be used for "visual display"
 * but we must be careful not to allow, for example, the user to display
 * hidden traps in a different way from floors, or secret doors in a way
 * different from granite walls, or even permanent granite in a different
 * way from granite.  XXX XXX XXX
 */

#include "angband.h"
#include "generate.h"
#include "grid.h"
#include "rooms.h"
#include "streams.h"

int dun_tun_rnd;
int dun_tun_chg;
int dun_tun_con;
int dun_tun_pen;
int dun_tun_jct;


/*
 * Dungeon generation data -- see "cave_gen()"
 */
dun_data *dun;


/*
 * Count the number of walls adjacent to the given grid.
 *
 * Note -- Assumes "in_bounds(y, x)"
 *
 * We count only granite walls and permanent walls.
 */
static int next_to_walls(int y, int x)
{
        int k = 0;

        if (in_bounds(y + 1, x) && is_extra_bold(y + 1, x)) k++;
        if (in_bounds(y - 1, x) && is_extra_bold(y - 1, x)) k++;
        if (in_bounds(y, x + 1) && is_extra_bold(y, x + 1)) k++;
        if (in_bounds(y, x - 1) && is_extra_bold(y, x - 1)) k++;

        return (k);
}


/*
 *  Helper function for alloc_stairs().
 *
 *  Is this a good location for stairs?
 */
static bool alloc_stairs_aux(int y, int x, int walls)
{
        /* Access the grid */
        cave_type *c_ptr = &cave[y][x];

        /* Require "naked" floor grid */
        if (!is_floor_grid(c_ptr)) return FALSE;
        if (pattern_tile(y, x)) return FALSE;
        if (c_ptr->o_idx || c_ptr->m_idx) return FALSE;

        /* Require a certain number of adjacent walls */
        if (next_to_walls(y, x) < walls) return FALSE;

        return TRUE;
}


/*
 * Places some staircases near walls
 */
static bool alloc_stairs(int feat, int num, int walls)
{
        int i;
        int shaft_num = 0;

        feature_type *f_ptr = &f_info[feat];

        if (have_flag(f_ptr->flags, FF_LESS))
        {
                /* No up stairs in town or in ironman mode */
                if (ironman_downward || !dun_level) return TRUE;

                if (dun_level > d_info[dungeon_type].mindepth)
                        shaft_num = (randint1(num+1))/2;
        }
        else if (have_flag(f_ptr->flags, FF_MORE))
        {
                int q_idx = quest_number(dun_level);

                /* No downstairs on quest levels */
                if (dun_level > 1 && q_idx)
                {
                        monster_race *r_ptr = &r_info[quest[q_idx].r_idx];

                        /* The quest monster(s) is still alive? */
                        if (!(r_ptr->flags1 & RF1_UNIQUE) || 0 < r_ptr->max_num)
                                return TRUE;
                }

                /* No downstairs at the bottom */
                if (dun_level >= d_info[dungeon_type].maxdepth) return TRUE;

                if ((dun_level < d_info[dungeon_type].maxdepth-1) && !quest_number(dun_level+1))
                        shaft_num = (randint1(num)+1)/2;
        }

        /* Paranoia */
        else return FALSE;


        /* Place "num" stairs */
        for (i = 0; i < num; i++)
        {
                while (TRUE)
                {
                        int y = 0, x = 0;
                        cave_type *c_ptr;

                        int candidates = 0;
                        int pick;

                        for (y = 1; y < cur_hgt - 1; y++)
                        {
                                for (x = 1; x < cur_wid - 1; x++)
                                {
                                        if (alloc_stairs_aux(y, x, walls))
                                        {
                                                /* A valid space found */
                                                candidates++;
                                        }
                                }
                        }

                        /* No valid place! */
                        if (!candidates)
                        {
                                /* There are exactly no place! */
                                if (walls <= 0) return FALSE;

                                /* Decrease walls limit, and try again */
                                walls--;
                                continue;
                        }

                        /* Choose a random one */
                        pick = randint1(candidates);

                        for (y = 1; y < cur_hgt - 1; y++)
                        {
                                for (x = 1; x < cur_wid - 1; x++)
                                {
                                        if (alloc_stairs_aux(y, x, walls))
                                        {
                                                pick--;

                                                /* Is this a picked one? */
                                                if (!pick) break;
                                        }
                                }

                                if (!pick) break;
                        }

                        /* Access the grid */
                        c_ptr = &cave[y][x];

                        /* Clear possible garbage of hidden trap */
                        c_ptr->mimic = 0;

                        /* Clear previous contents, add stairs */
                        c_ptr->feat = (i < shaft_num) ? feat_state(feat, FF_SHAFT) : feat;

                        /* No longer "FLOOR" */
                        c_ptr->info &= ~(CAVE_FLOOR);

                        /* Success */
                        break;
                }
        }
        return TRUE;
}


/*
 * Allocates some objects (using "place" and "type")
 */
static void alloc_object(int set, int typ, int num)
{
        int y = 0, x = 0, k;
        int dummy = 0;
        cave_type *c_ptr;

        /* A small level has few objects. */
        num = num * cur_hgt * cur_wid / (MAX_HGT*MAX_WID) +1;

        /* Place some objects */
        for (k = 0; k < num; k++)
        {
                /* Pick a "legal" spot */
                while (dummy < SAFE_MAX_ATTEMPTS)
                {
                        bool room;

                        dummy++;

                        /* Location */
                        y = randint0(cur_hgt);
                        x = randint0(cur_wid);

                        c_ptr = &cave[y][x];

                        /* Require "naked" floor grid */
                        if (!is_floor_grid(c_ptr) || c_ptr->o_idx || c_ptr->m_idx) continue;

                        /* Avoid player location */
                        if (player_bold(y, x)) continue;

                        /* Check for "room" */
                        room = (cave[y][x].info & CAVE_ROOM) ? TRUE : FALSE;

                        /* Require corridor? */
                        if ((set == ALLOC_SET_CORR) && room) continue;

                        /* Require room? */
                        if ((set == ALLOC_SET_ROOM) && !room) continue;

                        /* Accept it */
                        break;
                }

                if (dummy >= SAFE_MAX_ATTEMPTS)
                {
                        if (cheat_room)
                        {
#ifdef JP
msg_print("·Ù¹ð¡ª¥¢¥¤¥Æ¥à¤òÇÛÃ֤Ǥ­¤Þ¤»¤ó¡ª");
#else
                                msg_print("Warning! Could not place object!");
#endif

                        }
                        return;
                }


                /* Place something */
                switch (typ)
                {
                        case ALLOC_TYP_RUBBLE:
                        {
                                place_rubble(y, x);
                                cave[y][x].info &= ~(CAVE_FLOOR);
                                break;
                        }

                        case ALLOC_TYP_TRAP:
                        {
                                place_trap(y, x);
                                cave[y][x].info &= ~(CAVE_FLOOR);
                                break;
                        }

                        case ALLOC_TYP_GOLD:
                        {
                                place_gold(y, x);
                                break;
                        }

                        case ALLOC_TYP_OBJECT:
                        {
                                place_object(y, x, 0L);
                                break;
                        }
                }
        }
}


/*
 * Count the number of "corridor" grids adjacent to the given grid.
 *
 * Note -- Assumes "in_bounds(y1, x1)"
 *
 * XXX XXX This routine currently only counts actual "empty floor"
 * grids which are not in rooms.  We might want to also count stairs,
 * open doors, closed doors, etc.
 */
static int next_to_corr(int y1, int x1)
{
        int i, y, x, k = 0;

        cave_type *c_ptr;

        /* Scan adjacent grids */
        for (i = 0; i < 4; i++)
        {
                /* Extract the location */
                y = y1 + ddy_ddd[i];
                x = x1 + ddx_ddd[i];

                /* Access the grid */
                c_ptr = &cave[y][x];

                /* Skip non floors */
                if (cave_have_flag_grid(c_ptr, FF_WALL)) continue;

                /* Skip non "empty floor" grids */
                if (!is_floor_grid(c_ptr))
                        continue;

                /* Skip grids inside rooms */
                if (c_ptr->info & (CAVE_ROOM)) continue;

                /* Count these grids */
                k++;
        }

        /* Return the number of corridors */
        return (k);
}


/*
 * Determine if the given location is "between" two walls,
 * and "next to" two corridor spaces.  XXX XXX XXX
 *
 * Assumes "in_bounds(y, x)"
 */
static bool possible_doorway(int y, int x)
{
        /* Count the adjacent corridors */
        if (next_to_corr(y, x) >= 2)
        {
                /* Check Vertical */
                if (cave_have_flag_bold(y - 1, x, FF_WALL) &&
                    cave_have_flag_bold(y + 1, x, FF_WALL))
                {
                        return (TRUE);
                }

                /* Check Horizontal */
                if (cave_have_flag_bold(y, x - 1, FF_WALL) &&
                    cave_have_flag_bold(y, x + 1, FF_WALL))
                {
                        return (TRUE);
                }
        }

        /* No doorway */
        return (FALSE);
}


/*
 * Places door at y, x position if at least 2 walls found
 */
static void try_door(int y, int x)
{
        /* Paranoia */
        if (!in_bounds(y, x)) return;

        /* Ignore walls */
        if (cave_have_flag_bold(y, x, FF_WALL)) return;

        /* Ignore room grids */
        if (cave[y][x].info & (CAVE_ROOM)) return;

        /* Occasional door (if allowed) */
        if ((randint0(100) < dun_tun_jct) && possible_doorway(y, x) && !(d_info[dungeon_type].flags1 & DF1_NO_DOORS))
        {
                /* Place a door */
                place_random_door(y, x, FALSE);
        }
}


/* Place quest monsters */
bool place_quest_monsters(void)
{
        int i;

        /* Handle the quest monster placements */
        for (i = 0; i < max_quests; i++)
        {
                monster_race *r_ptr;
                u32b mode;
                int j;

                if (quest[i].status != QUEST_STATUS_TAKEN ||
                    (quest[i].type != QUEST_TYPE_KILL_LEVEL &&
                     quest[i].type != QUEST_TYPE_RANDOM) ||
                    quest[i].level != dun_level ||
                    dungeon_type != quest[i].dungeon ||
                    (quest[i].flags & QUEST_FLAG_PRESET))
                {
                        /* Ignore it */
                        continue;
                }

                r_ptr = &r_info[quest[i].r_idx];

                /* Hack -- "unique" monsters must be "unique" */
                if ((r_ptr->flags1 & RF1_UNIQUE) &&
                    (r_ptr->cur_num >= r_ptr->max_num)) continue;

                mode = (PM_NO_KAGE | PM_NO_PET);

                if (!(r_ptr->flags1 & RF1_FRIENDS))
                        mode |= PM_ALLOW_GROUP;

                for (j = 0; j < (quest[i].max_num - quest[i].cur_num); j++)
                {
                        int k;

                        for (k = 0; k < SAFE_MAX_ATTEMPTS; k++)
                        {
                                int x, y;
                                int l;

                                /* Find an empty grid */
                                for (l = SAFE_MAX_ATTEMPTS; l > 0; l--)
                                {
                                        cave_type    *c_ptr;
                                        feature_type *f_ptr;

                                        y = randint0(cur_hgt);
                                        x = randint0(cur_wid);

                                        c_ptr = &cave[y][x];
                                        f_ptr = &f_info[c_ptr->feat];

                                        if (!have_flag(f_ptr->flags, FF_MOVE) && !have_flag(f_ptr->flags, FF_CAN_FLY)) continue;
                                        if (!monster_can_enter(y, x, r_ptr, 0)) continue;
                                        if (distance(y, x, py, px) < 10) continue;
                                        if (c_ptr->info & CAVE_ICKY) continue;
                                        else break;
                                }

                                /* Failed to place */
                                if (!l) return FALSE;

                                /* Try to place the monster */
                                if (place_monster_aux(0, y, x, quest[i].r_idx, mode))
                                {
                                        /* Success */
                                        break;
                                }
                                else
                                {
                                        /* Failure - Try again */
                                        continue;
                                }
                        }

                        /* Failed to place */
                        if (k == SAFE_MAX_ATTEMPTS) return FALSE;
                }
        }

        return TRUE;
}


/*
 * Set boundary mimic and add "solid" perma-wall
 */
static void set_bound_perm_wall(cave_type *c_ptr)
{
        if (bound_walls_perm)
        {
                /* Clear boundary mimic */
                c_ptr->mimic = 0;
        }
        else
        {
                feature_type *f_ptr = &f_info[c_ptr->feat];

                /* Hack -- Decline boundary walls with known treasure  */
                if ((have_flag(f_ptr->flags, FF_HAS_GOLD) || have_flag(f_ptr->flags, FF_HAS_ITEM)) &&
                    !have_flag(f_ptr->flags, FF_SECRET))
                        c_ptr->feat = feat_state(c_ptr->feat, FF_ENSECRET);

                /* Set boundary mimic */
                c_ptr->mimic = c_ptr->feat;
        }

        /* Add "solid" perma-wall */
        place_solid_perm_grid(c_ptr);
}


/*
 * Generate various caverns and lakes
 *
 * There were moved from cave_gen().
 */
static void gen_caverns_and_lakes(void)
{
#ifdef ALLOW_CAVERNS_AND_LAKES
        /* Possible "destroyed" level */
        if ((dun_level > 30) && one_in_(DUN_DEST*2) && (small_levels) && (d_info[dungeon_type].flags1 & DF1_DESTROY))
        {
                dun->destroyed = TRUE;

                /* extra rubble around the place looks cool */
                build_lake(one_in_(2) ? LAKE_T_CAVE : LAKE_T_EARTH_VAULT);
        }

        /* Make a lake some of the time */
        if (one_in_(LAKE_LEVEL) && !dun->empty_level && !dun->destroyed &&
            (d_info[dungeon_type].flags1 & DF1_LAKE_MASK))
        {
                int count = 0;
                if (d_info[dungeon_type].flags1 & DF1_LAKE_WATER) count += 3;
                if (d_info[dungeon_type].flags1 & DF1_LAKE_LAVA) count += 3;
                if (d_info[dungeon_type].flags1 & DF1_LAKE_RUBBLE) count += 3;
                if (d_info[dungeon_type].flags1 & DF1_LAKE_TREE) count += 3;

                if (d_info[dungeon_type].flags1 & DF1_LAKE_LAVA)
                {
                        /* Lake of Lava */
                        if ((dun_level > 80) && (randint0(count) < 2)) dun->laketype = LAKE_T_LAVA;
                        count -= 2;

                        /* Lake of Lava2 */
                        if (!dun->laketype && (dun_level > 80) && one_in_(count)) dun->laketype = LAKE_T_FIRE_VAULT;
                        count--;
                }

                if ((d_info[dungeon_type].flags1 & DF1_LAKE_WATER) && !dun->laketype)
                {
                        /* Lake of Water */
                        if ((dun_level > 50) && randint0(count) < 2) dun->laketype = LAKE_T_WATER;
                        count -= 2;

                        /* Lake of Water2 */
                        if (!dun->laketype && (dun_level > 50) && one_in_(count)) dun->laketype = LAKE_T_WATER_VAULT;
                        count--;
                }

                if ((d_info[dungeon_type].flags1 & DF1_LAKE_RUBBLE) && !dun->laketype)
                {
                        /* Lake of rubble */
                        if ((dun_level > 35) && (randint0(count) < 2)) dun->laketype = LAKE_T_CAVE;
                        count -= 2;

                        /* Lake of rubble2 */
                        if (!dun->laketype && (dun_level > 35) && one_in_(count)) dun->laketype = LAKE_T_EARTH_VAULT;
                        count--;
                }

                /* Lake of tree */
                if ((dun_level > 5) && (d_info[dungeon_type].flags1 & DF1_LAKE_TREE) && !dun->laketype) dun->laketype = LAKE_T_AIR_VAULT;

                if (dun->laketype)
                {
                        if (cheat_room)
#ifdef JP
                                msg_print("¸Ð¤òÀ¸À®¡£");
#else
                                msg_print("Lake on the level.");
#endif

                        build_lake(dun->laketype);
                }
        }

        if ((dun_level > DUN_CAVERN) && !dun->empty_level &&
            (d_info[dungeon_type].flags1 & DF1_CAVERN) &&
            !dun->laketype && !dun->destroyed && (randint1(1000) < dun_level))
        {
                dun->cavern = TRUE;

                /* make a large fractal cave in the middle of the dungeon */

                if (cheat_room)
#ifdef JP
                        msg_print("ƶ·¢¤òÀ¸À®¡£");
#else
                        msg_print("Cavern on level.");
#endif

                build_cavern();
        }
#endif /* ALLOW_CAVERNS_AND_LAKES */

        /* Hack -- No destroyed "quest" levels */
        if (quest_number(dun_level)) dun->destroyed = FALSE;
}



/*
 * Generate a new dungeon level
 *
 * Note that "dun_body" adds about 4000 bytes of memory to the stack.
 */
static bool cave_gen(void)
{
        int i, k, y, x;

        dun_data dun_body;

        /* Global data */
        dun = &dun_body;

        dun->destroyed = FALSE;
        dun->empty_level = FALSE;
        dun->cavern = FALSE;
        dun->laketype = 0;

        /* Fill the arrays of floors and walls in the good proportions */
        set_floor_and_wall(dungeon_type);

        /* Prepare allocation table */
        get_mon_num_prep(get_monster_hook(), NULL);

        /* Randomize the dungeon creation values */
        dun_tun_rnd = rand_range(DUN_TUN_RND_MIN, DUN_TUN_RND_MAX);
        dun_tun_chg = rand_range(DUN_TUN_CHG_MIN, DUN_TUN_CHG_MAX);
        dun_tun_con = rand_range(DUN_TUN_CON_MIN, DUN_TUN_CON_MAX);
        dun_tun_pen = rand_range(DUN_TUN_PEN_MIN, DUN_TUN_PEN_MAX);
        dun_tun_jct = rand_range(DUN_TUN_JCT_MIN, DUN_TUN_JCT_MAX);

        /* Actual maximum number of rooms on this level */
        dun->row_rooms = cur_hgt / BLOCK_HGT;
        dun->col_rooms = cur_wid / BLOCK_WID;

        /* Initialize the room table */
        for (y = 0; y < dun->row_rooms; y++)
        {
                for (x = 0; x < dun->col_rooms; x++)
                {
                        dun->room_map[y][x] = FALSE;
                }
        }

        /* No rooms yet */
        dun->cent_n = 0;

        /* Empty arena levels */
        if (ironman_empty_levels || ((d_info[dungeon_type].flags1 & DF1_ARENA) && (empty_levels && one_in_(EMPTY_LEVEL))))
        {
                dun->empty_level = TRUE;

                if (cheat_room)
#ifdef JP
                        msg_print("¥¢¥ê¡¼¥Ê¥ì¥Ù¥ë");
#else
                        msg_print("Arena level.");
#endif
        }

        if (dun->empty_level)
        {
                /* Start with floors */
                for (y = 0; y < cur_hgt; y++)
                {
                        for (x = 0; x < cur_wid; x++)
                        {
                                place_floor_bold(y, x);
                        }
                }

                /* Special boundary walls -- Top and bottom */
                for (x = 0; x < cur_wid; x++)
                {
                        place_extra_bold(0, x);
                        place_extra_bold(cur_hgt - 1, x);
                }

                /* Special boundary walls -- Left and right */
                for (y = 1; y < (cur_hgt - 1); y++)
                {
                        place_extra_bold(y, 0);
                        place_extra_bold(y, cur_wid - 1);
                }
        }
        else
        {
                /* Start with walls */
                for (y = 0; y < cur_hgt; y++)
                {
                        for (x = 0; x < cur_wid; x++)
                        {
                                place_extra_bold(y, x);
                        }
                }
        }


        /* Generate various caverns and lakes */
        gen_caverns_and_lakes();


        /* Build maze */
        if (d_info[dungeon_type].flags1 & DF1_MAZE)
        {
                build_maze_vault(cur_wid/2-1, cur_hgt/2-1, cur_wid-4, cur_hgt-4, FALSE);

                /* Place 3 or 4 down stairs near some walls */
                if (!alloc_stairs(FEAT_MORE, rand_range(2, 3), 3)) return FALSE;

                /* Place 1 or 2 up stairs near some walls */
                if (!alloc_stairs(FEAT_LESS, 1, 3)) return FALSE;
        }

        /* Build some rooms */
        else
        {
                /*
                 * Build each type of room in turn until we cannot build any more.
                 */
                if (!generate_rooms()) return FALSE;


                /* Make a hole in the dungeon roof sometimes at level 1 */
                if (dun_level == 1)
                {
                        while (one_in_(DUN_MOS_DEN))
                        {
                                place_trees(randint1(cur_wid - 2), randint1(cur_hgt - 2));
                        }
                }

                /* Destroy the level if necessary */
                if (dun->destroyed) destroy_level();

                /* Hack -- Add some rivers */
                if (one_in_(3) && (randint1(dun_level) > 5))
                {
                        int feat1 = 0, feat2 = 0;

                        /* Choose water or lava */
                        if ((randint1(MAX_DEPTH * 2) - 1 > dun_level) && (d_info[dungeon_type].flags1 & DF1_WATER_RIVER))
                        {
                                feat1 = FEAT_DEEP_WATER;
                                feat2 = FEAT_SHAL_WATER;
                        }
                        else if  (d_info[dungeon_type].flags1 & DF1_LAVA_RIVER)
                        {
                                feat1 = FEAT_DEEP_LAVA;
                                feat2 = FEAT_SHAL_LAVA;
                        }
                        else feat1 = 0;

                        if (feat1)
                        {
                                feature_type *f_ptr = &f_info[feat1];

                                /* Only add river if matches lake type or if have no lake at all */
                                if (((dun->laketype == LAKE_T_LAVA) && have_flag(f_ptr->flags, FF_LAVA)) ||
                                    ((dun->laketype == LAKE_T_WATER) && have_flag(f_ptr->flags, FF_WATER)) ||
                                     !dun->laketype)
                                {
                                        add_river(feat1, feat2);
                                }
                        }
                }

                /* Hack -- Scramble the room order */
                for (i = 0; i < dun->cent_n; i++)
                {
                        int ty, tx;
                        int pick = rand_range(0, i);

                        ty = dun->cent[i].y;
                        tx = dun->cent[i].x;
                        dun->cent[i].y = dun->cent[pick].y;
                        dun->cent[i].x = dun->cent[pick].x;
                        dun->cent[pick].y = ty;
                        dun->cent[pick].x = tx;
                }

                /* Start with no tunnel doors */
                dun->door_n = 0;

                /* Hack -- connect the first room to the last room */
                y = dun->cent[dun->cent_n-1].y;
                x = dun->cent[dun->cent_n-1].x;

                /* Connect all the rooms together */
                for (i = 0; i < dun->cent_n; i++)
                {
                        int j;

                        /* Reset the arrays */
                        dun->tunn_n = 0;
                        dun->wall_n = 0;

                        /* Connect the room to the previous room */
                        if (randint1(dun_level) > d_info[dungeon_type].tunnel_percent)
                        {
                                /* make cave-like tunnel */
                                build_tunnel2(dun->cent[i].x, dun->cent[i].y, x, y, 2, 2);
                        }
                        else
                        {
                                /* make normal tunnel */
                                build_tunnel(dun->cent[i].y, dun->cent[i].x, y, x);
                        }

                        /* Turn the tunnel into corridor */
                        for (j = 0; j < dun->tunn_n; j++)
                        {
                                cave_type *c_ptr;
                                feature_type *f_ptr;

                                /* Access the grid */
                                y = dun->tunn[j].y;
                                x = dun->tunn[j].x;

                                /* Access the grid */
                                c_ptr = &cave[y][x];
                                f_ptr = &f_info[c_ptr->feat];

                                /* Clear previous contents (if not a lake), add a floor */
                                if (!have_flag(f_ptr->flags, FF_MOVE) || (!have_flag(f_ptr->flags, FF_WATER) && !have_flag(f_ptr->flags, FF_LAVA)))
                                {
                                        /* Clear mimic type */
                                        c_ptr->mimic = 0;

                                        place_floor_grid(c_ptr);
                                }
                        }

                        /* Apply the piercings that we found */
                        for (j = 0; j < dun->wall_n; j++)
                        {
                                cave_type *c_ptr;

                                /* Access the grid */
                                y = dun->wall[j].y;
                                x = dun->wall[j].x;

                                /* Access the grid */
                                c_ptr = &cave[y][x];

                                /* Clear mimic type */
                                c_ptr->mimic = 0;

                                /* Clear previous contents, add up floor */
                                place_floor_grid(c_ptr);

                                /* Occasional doorway */
                                if ((randint0(100) < dun_tun_pen) && !(d_info[dungeon_type].flags1 & DF1_NO_DOORS))
                                {
                                        /* Place a random door */
                                        place_random_door(y, x, TRUE);
                                }
                        }

                        /* Remember the "previous" room */
                        y = dun->cent[i].y;
                        x = dun->cent[i].x;
                }

                /* Place intersection doors */
                for (i = 0; i < dun->door_n; i++)
                {
                        /* Extract junction location */
                        y = dun->door[i].y;
                        x = dun->door[i].x;

                        /* Try placing doors */
                        try_door(y, x - 1);
                        try_door(y, x + 1);
                        try_door(y - 1, x);
                        try_door(y + 1, x);
                }

                /* Place 3 or 4 down stairs near some walls */
                if (!alloc_stairs(FEAT_MORE, rand_range(3, 4), 3)) return FALSE;

                /* Place 1 or 2 up stairs near some walls */
                if (!alloc_stairs(FEAT_LESS, rand_range(1, 2), 3)) return FALSE;
        }

        if (!dun->laketype)
        {
                if (d_info[dungeon_type].stream2)
                {
                        /* Hack -- Add some quartz streamers */
                        for (i = 0; i < DUN_STR_QUA; i++)
                        {
                                build_streamer(d_info[dungeon_type].stream2, DUN_STR_QC);
                        }
                }

                if (d_info[dungeon_type].stream1)
                {
                        /* Hack -- Add some magma streamers */
                        for (i = 0; i < DUN_STR_MAG; i++)
                        {
                                build_streamer(d_info[dungeon_type].stream1, DUN_STR_MC);
                        }
                }
        }

        /* Special boundary walls -- Top and bottom */
        for (x = 0; x < cur_wid; x++)
        {
                set_bound_perm_wall(&cave[0][x]);
                set_bound_perm_wall(&cave[cur_hgt - 1][x]);
        }

        /* Special boundary walls -- Left and right */
        for (y = 1; y < (cur_hgt - 1); y++)
        {
                set_bound_perm_wall(&cave[y][0]);
                set_bound_perm_wall(&cave[y][cur_wid - 1]);
        }

        /* Determine the character location */
        if (!new_player_spot()) return FALSE;

        if (!place_quest_monsters()) return FALSE;

        /* Basic "amount" */
        k = (dun_level / 3);
        if (k > 10) k = 10;
        if (k < 2) k = 2;

        /* Pick a base number of monsters */
        i = d_info[dungeon_type].min_m_alloc_level;

        /* To make small levels a bit more playable */
        if (cur_hgt < MAX_HGT || cur_wid < MAX_WID)
        {
                int small_tester = i;

                i = (i * cur_hgt) / MAX_HGT;
                i = (i * cur_wid) / MAX_WID;
                i += 1;

                if (i > small_tester) i = small_tester;
                else if (cheat_hear)
                {
#ifdef JP
msg_format("¥â¥ó¥¹¥¿¡¼¿ô´ðËÜÃͤò %d ¤«¤é %d ¤Ë¸º¤é¤·¤Þ¤¹", small_tester, i);
#else
                        msg_format("Reduced monsters base from %d to %d", small_tester, i);
#endif

                }
        }

        i += randint1(8);

        /* Put some monsters in the dungeon */
        for (i = i + k; i > 0; i--)
        {
                (void)alloc_monster(0, PM_ALLOW_SLEEP);
        }

        /* Place some traps in the dungeon */
        alloc_object(ALLOC_SET_BOTH, ALLOC_TYP_TRAP, randint1(k));

        /* Put some rubble in corridors (except NO_CAVE dungeon (Castle)) */
        if (!(d_info[dungeon_type].flags1 & DF1_NO_CAVE)) alloc_object(ALLOC_SET_CORR, ALLOC_TYP_RUBBLE, randint1(k));

        /* Mega Hack -- No object at first level of deeper dungeon */
        if (p_ptr->enter_dungeon && dun_level > 1)
        {
                /* No stair scum! */
                object_level = 1;
        }

        /* Put some objects in rooms */
        alloc_object(ALLOC_SET_ROOM, ALLOC_TYP_OBJECT, randnor(DUN_AMT_ROOM, 3));

        /* Put some objects/gold in the dungeon */
        alloc_object(ALLOC_SET_BOTH, ALLOC_TYP_OBJECT, randnor(DUN_AMT_ITEM, 3));
        alloc_object(ALLOC_SET_BOTH, ALLOC_TYP_GOLD, randnor(DUN_AMT_GOLD, 3));

        /* Set back to default */
        object_level = base_level;

        /* Put the Guardian */
        (void)alloc_guardian();

        if (dun->empty_level && (!one_in_(DARK_EMPTY) || (randint1(100) > dun_level)) && !(d_info[dungeon_type].flags1 & DF1_DARKNESS))
        {
                /* Lite the cave */
                for (y = 0; y < cur_hgt; y++)
                {
                        for (x = 0; x < cur_wid; x++)
                        {
                                cave[y][x].info |= (CAVE_GLOW);
                        }
                }
        }

        return TRUE;
}


/*
 * Builds the arena after it is entered -KMW-
 */
static void build_arena(void)
{
        int yval, y_height, y_depth, xval, x_left, x_right;
        register int i, j;

        yval = SCREEN_HGT / 2;
        xval = SCREEN_WID / 2;
        y_height = yval - 10;
        y_depth = yval + 10;
        x_left = xval - 32;
        x_right = xval + 32;

        for (i = y_height; i <= y_height + 5; i++)
                for (j = x_left; j <= x_right; j++)
                {
                        place_extra_perm_bold(i, j);
                        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
                }
        for (i = y_depth; i >= y_depth - 5; i--)
                for (j = x_left; j <= x_right; j++)
                {
                        place_extra_perm_bold(i, j);
                        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
                }
        for (j = x_left; j <= x_left + 17; j++)
                for (i = y_height; i <= y_depth; i++)
                {
                        place_extra_perm_bold(i, j);
                        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
                }
        for (j = x_right; j >= x_right - 17; j--)
                for (i = y_height; i <= y_depth; i++)
                {
                        place_extra_perm_bold(i, j);
                        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
                }

        place_extra_perm_bold(y_height+6, x_left+18);
        cave[y_height+6][x_left+18].info |= (CAVE_GLOW | CAVE_MARK);
        place_extra_perm_bold(y_depth-6, x_left+18);
        cave[y_depth-6][x_left+18].info |= (CAVE_GLOW | CAVE_MARK);
        place_extra_perm_bold(y_height+6, x_right-18);
        cave[y_height+6][x_right-18].info |= (CAVE_GLOW | CAVE_MARK);
        place_extra_perm_bold(y_depth-6, x_right-18);
        cave[y_depth-6][x_right-18].info |= (CAVE_GLOW | CAVE_MARK);

        i = y_height + 5;
        j = xval;
        cave[i][j].feat = f_tag_to_index("ARENA_GATE");
        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
        player_place(i, j);
}


/*
 * Town logic flow for generation of arena -KMW-
 */
static void arena_gen(void)
{
        int y, x;
        int qy = 0;
        int qx = 0;

        /* Smallest area */
        cur_hgt = SCREEN_HGT;
        cur_wid = SCREEN_WID;

        /* Start with solid walls */
        for (y = 0; y < MAX_HGT; y++)
        {
                for (x = 0; x < MAX_WID; x++)
                {
                        /* Create "solid" perma-wall */
                        place_solid_perm_bold(y, x);

                        /* Illuminate and memorize the walls */
                        cave[y][x].info |= (CAVE_GLOW | CAVE_MARK);
                }
        }

        /* Then place some floors */
        for (y = qy + 1; y < qy + SCREEN_HGT - 1; y++)
        {
                for (x = qx + 1; x < qx + SCREEN_WID - 1; x++)
                {
                        /* Create empty floor */
                        cave[y][x].feat = FEAT_FLOOR;
                }
        }

        build_arena();

        place_monster_aux(0, py + 5, px, arena_info[p_ptr->arena_number].r_idx,
            (PM_NO_KAGE | PM_NO_PET));
}



/*
 * Builds the arena after it is entered -KMW-
 */
static void build_battle(void)
{
        int yval, y_height, y_depth, xval, x_left, x_right;
        register int i, j;

        yval = SCREEN_HGT / 2;
        xval = SCREEN_WID / 2;
        y_height = yval - 10;
        y_depth = yval + 10;
        x_left = xval - 32;
        x_right = xval + 32;

        for (i = y_height; i <= y_height + 5; i++)
                for (j = x_left; j <= x_right; j++)
                {
                        place_extra_perm_bold(i, j);
                        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
                }
        for (i = y_depth; i >= y_depth - 3; i--)
                for (j = x_left; j <= x_right; j++)
                {
                        place_extra_perm_bold(i, j);
                        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
                }
        for (j = x_left; j <= x_left + 17; j++)
                for (i = y_height; i <= y_depth; i++)
                {
                        place_extra_perm_bold(i, j);
                        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
                }
        for (j = x_right; j >= x_right - 17; j--)
                for (i = y_height; i <= y_depth; i++)
                {
                        place_extra_perm_bold(i, j);
                        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
                }

        place_extra_perm_bold(y_height+6, x_left+18);
        cave[y_height+6][x_left+18].info |= (CAVE_GLOW | CAVE_MARK);
        place_extra_perm_bold(y_depth-4, x_left+18);
        cave[y_depth-4][x_left+18].info |= (CAVE_GLOW | CAVE_MARK);
        place_extra_perm_bold(y_height+6, x_right-18);
        cave[y_height+6][x_right-18].info |= (CAVE_GLOW | CAVE_MARK);
        place_extra_perm_bold(y_depth-4, x_right-18);
        cave[y_depth-4][x_right-18].info |= (CAVE_GLOW | CAVE_MARK);

        i = y_height + 4;
        j = xval;
        cave[i][j].feat = FEAT_BLDG_HEAD + 3;
        cave[i][j].info |= (CAVE_GLOW | CAVE_MARK);
        player_place(i, j);
}


/*
 * Town logic flow for generation of arena -KMW-
 */
static void battle_gen(void)
{
        int y, x, i;
        int qy = 0;
        int qx = 0;

        /* Start with solid walls */
        for (y = 0; y < MAX_HGT; y++)
        {
                for (x = 0; x < MAX_WID; x++)
                {
                        /* Create "solid" perma-wall */
                        place_solid_perm_bold(y, x);

                        /* Illuminate and memorize the walls */
                        cave[y][x].info |= (CAVE_GLOW | CAVE_MARK);
                }
        }

        /* Then place some floors */
        for (y = qy + 1; y < qy + SCREEN_HGT - 1; y++)
        {
                for (x = qx + 1; x < qx + SCREEN_WID - 1; x++)
                {
                        /* Create empty floor */
                        cave[y][x].feat = FEAT_FLOOR;
                }
        }

        build_battle();

        for(i=0;i<4;i++)
        {
                place_monster_aux(0, py + 5 + (i/2)*4, px - 2 + (i%2)*4, battle_mon[i],
                                  (PM_NO_KAGE | PM_NO_PET));
                set_friendly(&m_list[cave[py+5+(i/2)*4][px-2+(i%2)*4].m_idx]);
        }
        for(i = 1; i < m_max; i++)
        {
                monster_type *m_ptr = &m_list[i];

                if (!m_ptr->r_idx) continue;

                /* Hack -- Detect monster */
                m_ptr->mflag2 |= (MFLAG2_MARK | MFLAG2_SHOW);

                /* Update the monster */
                update_mon(i, FALSE);
        }
}


/*
 * Generate a quest level
 */
static void quest_gen(void)
{
        int x, y;


        /* Start with perm walls */
        for (y = 0; y < cur_hgt; y++)
        {
                for (x = 0; x < cur_wid; x++)
                {
                        place_solid_perm_bold(y, x);
                }
        }

        /* Set the quest level */
        base_level = quest[p_ptr->inside_quest].level;
        dun_level = base_level;
        object_level = base_level;
        monster_level = base_level;

        if (record_stair) do_cmd_write_nikki(NIKKI_TO_QUEST, p_ptr->inside_quest, NULL);

        /* Prepare allocation table */
        get_mon_num_prep(get_monster_hook(), NULL);

        init_flags = INIT_CREATE_DUNGEON | INIT_ASSIGN;

        process_dungeon_file("q_info.txt", 0, 0, MAX_HGT, MAX_WID);
}

/* Make a real level */
static bool level_gen(cptr *why)
{
        int level_height, level_width;

        if ((always_small_levels || ironman_small_levels ||
            (one_in_(SMALL_LEVEL) && small_levels) ||
             (d_info[dungeon_type].flags1 & DF1_BEGINNER) ||
            (d_info[dungeon_type].flags1 & DF1_SMALLEST)) &&
            !(d_info[dungeon_type].flags1 & DF1_BIG))
        {
                if (cheat_room)
#ifdef JP
                        msg_print("¾®¤µ¤Ê¥Õ¥í¥¢");
#else
                        msg_print("A 'small' dungeon level.");
#endif

                if (d_info[dungeon_type].flags1 & DF1_SMALLEST)
                {
                        level_height = 1;
                        level_width = 1;
                }
                else if (d_info[dungeon_type].flags1 & DF1_BEGINNER)
                {
                        level_height = 2;
                        level_width = 2;
                }
                else
                {
                        do
                        {
                                level_height = randint1(MAX_HGT/SCREEN_HGT);
                                level_width = randint1(MAX_WID/SCREEN_WID);
                        }
                        while ((level_height == MAX_HGT/SCREEN_HGT) &&
                                   (level_width == MAX_WID/SCREEN_WID));
                }

                cur_hgt = level_height * SCREEN_HGT;
                cur_wid = level_width * SCREEN_WID;

                /* Assume illegal panel */
                panel_row_min = cur_hgt;
                panel_col_min = cur_wid;

                if (cheat_room)
                  msg_format("X:%d, Y:%d.", cur_wid, cur_hgt);
        }
        else
        {
                /* Big dungeon */
                cur_hgt = MAX_HGT;
                cur_wid = MAX_WID;

                /* Assume illegal panel */
                panel_row_min = cur_hgt;
                panel_col_min = cur_wid;
        }

        /* Make a dungeon */
        if (!cave_gen())
        {
#ifdef JP
*why = "¥À¥ó¥¸¥ç¥óÀ¸À®¤Ë¼ºÇÔ";
#else
                *why = "could not place player";
#endif

                return FALSE;
        }
        else return TRUE;
}


/*
 * Wipe all unnecessary flags after cave generation
 */
static void wipe_generate_cave_flags(void)
{
        int x, y;

        for (y = 0; y < cur_hgt; y++)
        {
                for (x = 0; x < cur_wid; x++)
                {
                        /* Wipe unused flags */
                        cave[y][x].info &= ~(CAVE_MASK);
                }
        }

        if (dun_level)
        {
                for (y = 1; y < cur_hgt - 1; y++)
                {
                        for (x = 1; x < cur_wid - 1; x++)
                        {
                                /* There might be trap */
                                cave[y][x].info |= CAVE_UNSAFE;
                        }
                }
        }
}


/*
 *  Clear and empty the cave
 */
void clear_cave(void)
{
        int x, y, i;

        /* Very simplified version of wipe_o_list() */
        C_WIPE(o_list, o_max, object_type);
        o_max = 1;
        o_cnt = 0;

        /* Very simplified version of wipe_m_list() */
        for (i = 1; i < max_r_idx; i++)
                r_info[i].cur_num = 0;
        C_WIPE(m_list, m_max, monster_type);
        m_max = 1;
        m_cnt = 0;
        for (i = 0; i < MAX_MTIMED; i++) mproc_max[i] = 0;

        /* Pre-calc cur_num of pets in party_mon[] */
        precalc_cur_num_of_pet();


        /* Start with a blank cave */
        for (y = 0; y < MAX_HGT; y++)
        {
                for (x = 0; x < MAX_WID; x++)
                {
                        cave_type *c_ptr = &cave[y][x];

                        /* No flags */
                        c_ptr->info = 0;

                        /* No features */
                        c_ptr->feat = 0;

                        /* No objects */
                        c_ptr->o_idx = 0;

                        /* No monsters */
                        c_ptr->m_idx = 0;

                        /* No special */
                        c_ptr->special = 0;

                        /* No mimic */
                        c_ptr->mimic = 0;

                        /* No flow */
                        c_ptr->cost = 0;
                        c_ptr->dist = 0;
                        c_ptr->when = 0;
                }
        }

        /* Mega-Hack -- no player yet */
        px = py = 0;

        /* Set the base level */
        base_level = dun_level;

        /* Reset the monster generation level */
        monster_level = base_level;

        /* Reset the object generation level */
        object_level = base_level;
}


/*
 * Generates a random dungeon level                     -RAK-
 *
 * Hack -- regenerate any "overflow" levels
 */
void generate_cave(void)
{
        int num;

        /* Fill the arrays of floors and walls in the good proportions */
        set_floor_and_wall(dungeon_type);

        /* Generate */
        for (num = 0; TRUE; num++)
        {
                bool okay = TRUE;

                cptr why = NULL;

                /* Clear and empty the cave */
                clear_cave();

                /* Build the arena -KMW- */
                if (p_ptr->inside_arena)
                {
                        /* Small arena */
                        arena_gen();
                }

                /* Build the battle -KMW- */
                else if (p_ptr->inside_battle)
                {
                        /* Small arena */
                        battle_gen();
                }

                else if (p_ptr->inside_quest)
                {
                        quest_gen();
                }

                /* Build the town */
                else if (!dun_level)
                {
                        /* Make the wilderness */
                        if (p_ptr->wild_mode) wilderness_gen_small();
                        else wilderness_gen();
                }

                /* Build a real level */
                else
                {
                        okay = level_gen(&why);
                }


                /* Prevent object over-flow */
                if (o_max >= max_o_idx)
                {
                        /* Message */
#ifdef JP
why = "¥¢¥¤¥Æ¥à¤¬Â¿¤¹¤®¤ë";
#else
                        why = "too many objects";
#endif


                        /* Message */
                        okay = FALSE;
                }
                /* Prevent monster over-flow */
                else if (m_max >= max_m_idx)
                {
                        /* Message */
#ifdef JP
why = "¥â¥ó¥¹¥¿¡¼¤¬Â¿¤¹¤®¤ë";
#else
                        why = "too many monsters";
#endif


                        /* Message */
                        okay = FALSE;
                }

                /* Accept */
                if (okay) break;

                /* Message */
#ifdef JP
if (why) msg_format("À¸À®¤ä¤êľ¤·(%s)", why);
#else
                if (why) msg_format("Generation restarted (%s)", why);
#endif


                /* Wipe the objects */
                wipe_o_list();

                /* Wipe the monsters */
                wipe_m_list();
        }

        /* Glow deep lava and building entrances */
        glow_deep_lava_and_bldg();

        /* Reset flag */
        p_ptr->enter_dungeon = FALSE;

        wipe_generate_cave_flags();
}