[Refactor] #39970 Moved dungeon*.c/h to dungeon/

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

/*!
 * @file rooms.c
 * @brief ダンジョンフロアの部屋生成処理 / make rooms. Used by generate.c when creating dungeons.
 * @date 2014/01/06
 * @author
 * Copyright (c) 1997 Ben Harrison, James E. Wilson, Robert A. Koeneke\n
 * This software may be copied and distributed for educational, research,\n
 * and not for profit purposes provided that this copyright and statement\n
 * are included in all such copies.  Other copyrights may also apply.\n
 * 2014 Deskull rearranged comment for Doxygen. \n
 * @details
 * Room building routines.\n
 *\n
 * Room types:\n
 *   1 -- normal\n
 *   2 -- overlapping\n
 *   3 -- cross shaped\n
 *   4 -- large room with features\n
 *   5 -- monster nests\n
 *   6 -- monster pits\n
 *   7 -- simple vaults\n
 *   8 -- greater vaults\n
 *   9 -- fractal caves\n
 *  10 -- random vaults\n
 *  11 -- circular rooms\n
 *  12 -- crypts\n
 *  13 -- trapped monster pits\n
 *  14 -- trapped room\n
 *  15 -- glass room\n
 *  16 -- underground arcade\n
 *\n
 * Some functions are used to determine if the given monster\n
 * is appropriate for inclusion in a monster nest or monster pit or\n
 * the given type.\n
 *\n
 * None of the pits/nests are allowed to include "unique" monsters.\n
 */

#include "angband.h"
#include "util.h"

#include "feature.h"
#include "floor.h"
#include "floor-generate.h"
#include "dungeon/dungeon.h"
#include "grid.h"
#include "rooms.h"

#include "rooms-city.h"
#include "rooms-fractal.h"
#include "rooms-normal.h"
#include "room/rooms-pit-nest.h"
#include "rooms-special.h"
#include "rooms-trap.h"
#include "rooms-vault.h"

#include "trap.h"

#include "monster.h"


 /*!
  * 各部屋タイプの生成比定義
  *[from SAngband (originally from OAngband)]\n
  *\n
  * Table of values that control how many times each type of room will\n
  * appear.  Each type of room has its own row, and each column\n
  * corresponds to dungeon levels 0, 10, 20, and so on.  The final\n
  * value is the minimum depth the room can appear at.  -LM-\n
  *\n
  * Level 101 and below use the values for level 100.\n
  *\n
  * Rooms with lots of monsters or loot may not be generated if the\n
  * object or monster lists are already nearly full.  Rooms will not\n
  * appear above their minimum depth.  Tiny levels will not have space\n
  * for all the rooms you ask for.\n
  */

static room_info_type room_info_normal[ROOM_T_MAX] =
{
        /* Depth */
        /*  0  10  20  30  40  50  60  70  80  90 100  min limit */
        {{999,900,800,700,600,500,400,300,200,100,  0},  0}, /*NORMAL   */
        {{  1, 10, 20, 30, 40, 50, 60, 70, 80, 90,100},  1}, /*OVERLAP  */
        {{  1, 10, 20, 30, 40, 50, 60, 70, 80, 90,100},  3}, /*CROSS    */
        {{  1, 10, 20, 30, 40, 50, 60, 70, 80, 90,100},  3}, /*INNER_F  */
        {{  0,  1,  1,  1,  2,  3,  5,  6,  8, 10, 13}, 10}, /*NEST     */
        {{  0,  1,  1,  2,  3,  4,  6,  8, 10, 13, 16}, 10}, /*PIT      */
        {{  0,  1,  1,  1,  2,  2,  3,  5,  6,  8, 10}, 10}, /*LESSER_V */
        {{  0,  0,  1,  1,  1,  2,  2,  2,  3,  3,  4}, 20}, /*GREATER_V*/
        {{  0,100,200,300,400,500,600,700,800,900,999}, 10}, /*FRACAVE  */
        {{  0,  1,  1,  1,  1,  1,  1,  1,  1,  2,  2}, 10}, /*RANDOM_V */
        {{  0,  4,  8, 12, 16, 20, 24, 28, 32, 36, 40},  3}, /*OVAL     */
        {{  1,  6, 12, 18, 24, 30, 36, 42, 48, 54, 60}, 10}, /*CRYPT    */
        {{  0,  0,  1,  1,  1,  2,  3,  4,  5,  6,  8}, 20}, /*TRAP_PIT */
        {{  0,  0,  1,  1,  1,  2,  3,  4,  5,  6,  8}, 20}, /*TRAP     */
        {{  0,  0,  0,  0,  1,  1,  1,  2,  2,  2,  2}, 40}, /*GLASS    */
        {{  1,  1,  1,  1,  1,  1,  1,  2,  2,  3,  3},  1}, /*ARCADE   */
        {{  1,  8, 16, 24, 32, 40, 48, 56, 64, 72, 80},  1}, /*FIX      */
};

/*! 部屋の生成処理順 / Build rooms in descending order of difficulty. */
static byte room_build_order[ROOM_T_MAX] = {
        ROOM_T_GREATER_VAULT,
        ROOM_T_ARCADE,
        ROOM_T_RANDOM_VAULT,
        ROOM_T_LESSER_VAULT,
        ROOM_T_TRAP_PIT,
        ROOM_T_PIT,
        ROOM_T_NEST,
        ROOM_T_TRAP,
        ROOM_T_GLASS,
        ROOM_T_INNER_FEAT,
        ROOM_T_FIXED,
        ROOM_T_OVAL,
        ROOM_T_CRYPT,
        ROOM_T_OVERLAP,
        ROOM_T_CROSS,
        ROOM_T_FRACAVE,
        ROOM_T_NORMAL,
};

/*!
 * @brief 1マスだけの部屋を作成し、上下左右いずれか一つに隠しドアを配置する。
 * @param player_ptr プレーヤーへの参照ポインタ
 * @param y0 配置したい中心のY座標
 * @param x0 配置したい中心のX座標
 * @details
 * This funtion makes a very small room centred at (x0, y0)
 * This is used in crypts, and random elemental vaults.
 *
 * Note - this should be used only on allocated regions
 * within another room.
 */
void build_small_room(player_type *player_ptr, POSITION x0, POSITION y0)
{
        POSITION x, y;

        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        for (y = y0 - 1; y <= y0 + 1; y++)
        {
                place_bold(player_ptr, y, x0 - 1, GB_INNER);
                place_bold(player_ptr, y, x0 + 1, GB_INNER);
        }

        for (x = x0 - 1; x <= x0 + 1; x++)
        {
                place_bold(player_ptr, y0 - 1, x, GB_INNER);
                place_bold(player_ptr, y0 + 1, x, GB_INNER);
        }

        /* Place a secret door on one side */
        switch (randint0(4))
        {
        case 0: place_secret_door(player_ptr, y0, x0 - 1, DOOR_DEFAULT); break;
        case 1: place_secret_door(player_ptr, y0, x0 + 1, DOOR_DEFAULT); break;
        case 2: place_secret_door(player_ptr, y0 - 1, x0, DOOR_DEFAULT); break;
        case 3: place_secret_door(player_ptr, y0 + 1, x0, DOOR_DEFAULT); break;
        }

        /* Clear mimic type */
        floor_ptr->grid_array[y0][x0].mimic = 0;

        /* Add inner open space */
        place_bold(player_ptr, y0, x0, GB_FLOOR);
}

/*!
 * @brief
 * 指定範囲に通路が通っていることを確認した上で床で埋める
 * This function tunnels around a room if it will cut off part of a grid system.
 * @param player_ptr プレーヤーへの参照ポインタ
 * @param x1 範囲の左端
 * @param y1 範囲の上端
 * @param x2 範囲の右端
 * @param y2 範囲の下端
 * @return なし
 */
static void check_room_boundary(player_type *player_ptr, POSITION x1, POSITION y1, POSITION x2, POSITION y2)
{
        int count;
        POSITION x, y;
        bool old_is_floor, new_is_floor;
        count = 0;

        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        old_is_floor = get_is_floor(floor_ptr, x1 - 1, y1);

        /*
         * Count the number of floor-wall boundaries around the room
         * Note: diagonal squares are ignored since the player can move diagonally
         * to bypass these if needed.
         */

         /* Above the top boundary */
        for (x = x1; x <= x2; x++)
        {
                new_is_floor = get_is_floor(floor_ptr, x, y1 - 1);

                /* Increment counter if they are different */
                if (new_is_floor != old_is_floor) count++;

                old_is_floor = new_is_floor;
        }

        /* Right boundary */
        for (y = y1; y <= y2; y++)
        {
                new_is_floor = get_is_floor(floor_ptr, x2 + 1, y);

                /* increment counter if they are different */
                if (new_is_floor != old_is_floor) count++;

                old_is_floor = new_is_floor;
        }

        /* Bottom boundary */
        for (x = x2; x >= x1; x--)
        {
                new_is_floor = get_is_floor(floor_ptr, x, y2 + 1);

                /* increment counter if they are different */
                if (new_is_floor != old_is_floor) count++;

                old_is_floor = new_is_floor;
        }

        /* Left boundary */
        for (y = y2; y >= y1; y--)
        {
                new_is_floor = get_is_floor(floor_ptr, x1 - 1, y);

                /* increment counter if they are different */
                if (new_is_floor != old_is_floor) count++;

                old_is_floor = new_is_floor;
        }

        /* If all the same, or only one connection exit. */
        if (count <= 2) return;


        /* Tunnel around the room so to prevent problems with caves */
        for (y = y1; y <= y2; y++)
        {
                for (x = x1; x <= x2; x++)
                {
                        set_floor(player_ptr, x, y);
                }
        }
}


/*!
 * @brief
 * find_space()の予備処理として部屋の生成が可能かを判定する /
 * Helper function for find_space(). Is this a good location?
 * @param blocks_high 範囲の高さ
 * @param blocks_wide 範囲の幅
 * @param block_y 範囲の上端
 * @param block_x 範囲の左端
 * @return なし
 */
static bool find_space_aux(POSITION blocks_high, POSITION blocks_wide, POSITION block_y, POSITION block_x)
{
        POSITION by1, bx1, by2, bx2, by, bx;

        /* Itty-bitty rooms must shift about within their rectangle */
        if (blocks_wide < 3)
        {
                if ((blocks_wide == 2) && (block_x % 3) == 2)
                        return FALSE;
        }

        /* Rooms with width divisible by 3 must be fitted to a rectangle. */
        else if ((blocks_wide % 3) == 0)
        {
                /* Must be aligned to the left edge of a 11x33 rectangle. */
                if ((block_x % 3) != 0)
                        return FALSE;
        }

        /*
         * Big rooms that do not have a width divisible by 3 must be
         * aligned towards the edge of the dungeon closest to them.
         */
        else
        {
                /* Shift towards left edge of dungeon. */
                if (block_x + (blocks_wide / 2) <= dun->col_rooms / 2)
                {
                        if (((block_x % 3) == 2) && ((blocks_wide % 3) == 2))
                                return FALSE;
                        if ((block_x % 3) == 1)
                                return FALSE;
                }

                /* Shift toward right edge of dungeon. */
                else
                {
                        if (((block_x % 3) == 2) && ((blocks_wide % 3) == 2))
                                return FALSE;
                        if ((block_x % 3) == 1)
                                return FALSE;
                }
        }

        /* Extract blocks */
        by1 = block_y;
        bx1 = block_x;
        by2 = block_y + blocks_high;
        bx2 = block_x + blocks_wide;

        /* Never run off the screen */
        if ((by1 < 0) || (by2 > dun->row_rooms)) return FALSE;
        if ((bx1 < 0) || (bx2 > dun->col_rooms)) return FALSE;

        /* Verify available space */
        for (by = by1; by < by2; by++)
        {
                for (bx = bx1; bx < bx2; bx++)
                {
                        if (dun->room_map[by][bx])
                        {
                                return FALSE;
                        }
                }
        }

        /* This location is okay */
        return TRUE;
}


/*!
 * @brief 部屋生成が可能なスペースを確保する / Find a good spot for the next room.  -LM-
 * @param player_ptr プレーヤーへの参照ポインタ
 * @param y 部屋の生成が可能な中心Y座標を返す参照ポインタ
 * @param x 部屋の生成が可能な中心X座標を返す参照ポインタ
 * @param height 確保したい領域の高さ
 * @param width 確保したい領域の幅
 * @return 所定の範囲が確保できた場合TRUEを返す
 * @details
 * Find and allocate a free space in the dungeon large enough to hold\n
 * the room calling this function.\n
 *\n
 * We allocate space in 11x11 blocks, but want to make sure that rooms\n
 * align neatly on the standard screen.  Therefore, we make them use\n
 * blocks in few 11x33 rectangles as possible.\n
 *\n
 * Be careful to include the edges of the room in height and width!\n
 *\n
 * Return TRUE and values for the center of the room if all went well.\n
 * Otherwise, return FALSE.\n
 */
bool find_space(player_type *player_ptr, POSITION *y, POSITION *x, POSITION height, POSITION width)
{
        int candidates, pick;
        POSITION by, bx, by1, bx1, by2, bx2;
        POSITION block_y = 0, block_x = 0;

        /* Find out how many blocks we need. */
        POSITION blocks_high = 1 + ((height - 1) / BLOCK_HGT);
        POSITION blocks_wide = 1 + ((width - 1) / BLOCK_WID);

        /* There are no way to allocate such huge space */
        if (dun->row_rooms < blocks_high) return FALSE;
        if (dun->col_rooms < blocks_wide) return FALSE;

        /* Initiallize */
        candidates = 0;

        /* Count the number of valid places */
        for (block_y = dun->row_rooms - blocks_high; block_y >= 0; block_y--)
        {
                for (block_x = dun->col_rooms - blocks_wide; block_x >= 0; block_x--)
                {
                        if (find_space_aux(blocks_high, blocks_wide, block_y, block_x))
                        {
                                /* Find a valid place */
                                candidates++;
                        }
                }
        }

        /* No place! */
        if (!candidates)
        {
                return FALSE;
        }

        /* Normal dungeon */
        if (!(d_info[player_ptr->current_floor_ptr->dungeon_idx].flags1 & DF1_NO_CAVE))
        {
                /* Choose a random one */
                pick = randint1(candidates);
        }

        /* NO_CAVE dungeon (Castle) */
        else
        {
                /* Always choose the center one */
                pick = candidates / 2 + 1;
        }

        /* Pick up the choosen location */
        for (block_y = dun->row_rooms - blocks_high; block_y >= 0; block_y--)
        {
                for (block_x = dun->col_rooms - blocks_wide; block_x >= 0; block_x--)
                {
                        if (find_space_aux(blocks_high, blocks_wide, block_y, block_x))
                        {
                                pick--;

                                /* This one is picked? */
                                if (!pick) break;
                        }
                }

                if (!pick) break;
        }

        /* Extract blocks */
        by1 = block_y;
        bx1 = block_x;
        by2 = block_y + blocks_high;
        bx2 = block_x + blocks_wide;

        /*
         * It is *extremely* important that the following calculation
         * be *exactly* correct to prevent memory errors
         */

         /* Acquire the location of the room */
        (*y) = ((by1 + by2) * BLOCK_HGT) / 2;
        (*x) = ((bx1 + bx2) * BLOCK_WID) / 2;

        /* Save the room location */
        if (dun->cent_n < CENT_MAX)
        {
                dun->cent[dun->cent_n].y = (byte)*y;
                dun->cent[dun->cent_n].x = (byte)*x;
                dun->cent_n++;
        }

        /* Reserve some blocks. */
        for (by = by1; by < by2; by++)
        {
                for (bx = bx1; bx < bx2; bx++)
                {
                        dun->room_map[by][bx] = TRUE;
                }
        }

        /*
         * Hack- See if room will cut off a cavern.
         *
         * If so, fix by tunneling outside the room in such a
         * way as to connect the caves.
         */
        check_room_boundary(player_ptr, *x - width / 2 - 1, *y - height / 2 - 1, *x + (width - 1) / 2 + 1, *y + (height - 1) / 2 + 1);

        /* Success. */
        return TRUE;
}


/*
 * Structure to hold all "fill" data
 */

typedef struct fill_data_type fill_data_type;

struct fill_data_type
{
        /* area size */
        POSITION xmin;
        POSITION ymin;
        POSITION xmax;
        POSITION ymax;

        /* cutoffs */
        int c1;
        int c2;
        int c3;

        /* features to fill with */
        FEAT_IDX feat1;
        FEAT_IDX feat2;
        FEAT_IDX feat3;

        int info1;
        int info2;
        int info3;

        /* number of filled squares */
        int amount;
};

static fill_data_type fill_data;


/* Store routine for the fractal floor generator */
/* this routine probably should be an inline function or a macro. */
static void store_height(floor_type *floor_ptr, POSITION x, POSITION y, FEAT_IDX val)
{
        /* if on boundary set val > cutoff so walls are not as square */
        if (((x == fill_data.xmin) || (y == fill_data.ymin) ||
                (x == fill_data.xmax) || (y == fill_data.ymax)) &&
                (val <= fill_data.c1)) val = fill_data.c1 + 1;

        /* store the value in height-map format */
        floor_ptr->grid_array[y][x].feat = val;

        return;
}


/*
* Explanation of the plasma fractal algorithm:
*
* A grid of points is created with the properties of a 'height-map'
* This is done by making the corners of the grid have a random value.
* The grid is then subdivided into one with twice the resolution.
* The new points midway between two 'known' points can be calculated
* by taking the average value of the 'known' ones and randomly adding
* or subtracting an amount proportional to the distance between those
* points.  The final 'middle' points of the grid are then calculated
* by averaging all four of the originally 'known' corner points.  An
* random amount is added or subtracted from this to get a value of the
* height at that point.  The scaling factor here is adjusted to the
* slightly larger distance diagonally as compared to orthogonally.
*
* This is then repeated recursively to fill an entire 'height-map'
* A rectangular map is done the same way, except there are different
* scaling factors along the x and y directions.
*
* A hack to change the amount of correlation between points is done using
* the grd variable.  If the current step size is greater than grd then
* the point will be random, otherwise it will be calculated by the
* above algorithm.  This makes a maximum distance at which two points on
* the height map can affect each other.
*
* How fractal caves are made:
*
* When the map is complete, a cut-off value is used to create a floor.
* Heights below this value are "floor", and heights above are "wall".
* This also can be used to create lakes, by adding more height levels
* representing shallow and deep water/ lava etc.
*
* The grd variable affects the width of passages.
* The roug variable affects the roughness of those passages
*
* The tricky part is making sure the created floor is connected.  This
* is done by 'filling' from the inside and only keeping the 'filled'
* floor.  Walls bounding the 'filled' floor are also kept.  Everything
* else is converted to the normal _extra_.
 */


 /*
  *  Note that this uses the floor array in a very hackish way
  *  the values are first set to zero, and then each array location
  *  is used as a "heightmap"
  *  The heightmap then needs to be converted back into the "feat" format.
  *
  *  grd=level at which fractal turns on.  smaller gives more mazelike caves
  *  roug=roughness level.  16=normal.  higher values make things more convoluted
  *    small values are good for smooth walls.
  *  size=length of the side of the square grid system.
  */
void generate_hmap(floor_type *floor_ptr, POSITION y0, POSITION x0, POSITION xsiz, POSITION ysiz, int grd, int roug, int cutoff)
{
        POSITION xhsize, yhsize, xsize, ysize, maxsize;

        /*
         * fixed point variables- these are stored as 256 x normal value
         * this gives 8 binary places of fractional part + 8 places of normal part
         */

        POSITION xstep, xhstep, ystep, yhstep;
        POSITION xstep2, xhstep2, ystep2, yhstep2;
        POSITION i, j, ii, jj, diagsize, xxsize, yysize;

        /* Cache for speed */
        POSITION xm, xp, ym, yp;

        /* redefine size so can change the value if out of range */
        xsize = xsiz;
        ysize = ysiz;

        /* Paranoia about size of the system of caves */
        if (xsize > 254) xsize = 254;
        if (xsize < 4) xsize = 4;
        if (ysize > 254) ysize = 254;
        if (ysize < 4) ysize = 4;

        /* get offsets to middle of array */
        xhsize = xsize / 2;
        yhsize = ysize / 2;

        /* fix rounding problem */
        xsize = xhsize * 2;
        ysize = yhsize * 2;

        /* get limits of region */
        fill_data.xmin = x0 - xhsize;
        fill_data.ymin = y0 - yhsize;
        fill_data.xmax = x0 + xhsize;
        fill_data.ymax = y0 + yhsize;

        /* Store cutoff in global for quick access */
        fill_data.c1 = cutoff;

        /*
        * Scale factor for middle points:
        * About sqrt(2) * 256 - correct for a square lattice
        * approximately correct for everything else.
         */
        diagsize = 362;

        /* maximum of xsize and ysize */
        maxsize = (xsize > ysize) ? xsize : ysize;

        /* Clear the section */
        for (i = 0; i <= xsize; i++)
        {
                for (j = 0; j <= ysize; j++)
                {
                        /* -1 is a flag for "not done yet" */
                        floor_ptr->grid_array[(int)(fill_data.ymin + j)][(int)(fill_data.xmin + i)].feat = -1;
                        /* Clear icky flag because may be redoing the floor_ptr->grid_array */
                        floor_ptr->grid_array[(int)(fill_data.ymin + j)][(int)(fill_data.xmin + i)].info &= ~(CAVE_ICKY);
                }
        }

        /* Boundaries are walls */
        floor_ptr->grid_array[fill_data.ymin][fill_data.xmin].feat = (s16b)maxsize;
        floor_ptr->grid_array[fill_data.ymax][fill_data.xmin].feat = (s16b)maxsize;
        floor_ptr->grid_array[fill_data.ymin][fill_data.xmax].feat = (s16b)maxsize;
        floor_ptr->grid_array[fill_data.ymax][fill_data.xmax].feat = (s16b)maxsize;

        /* Set the middle square to be an open area. */
        floor_ptr->grid_array[y0][x0].feat = 0;

        /* Initialize the step sizes */
        xstep = xhstep = xsize * 256;
        ystep = yhstep = ysize * 256;
        xxsize = xsize * 256;
        yysize = ysize * 256;

        /*
         * Fill in the rectangle with fractal height data -
         * like the 'plasma fractal' in fractint.
         */
        while ((xhstep > 256) || (yhstep > 256))
        {
                /* Halve the step sizes */
                xstep = xhstep;
                xhstep /= 2;
                ystep = yhstep;
                yhstep /= 2;

                /* cache well used values */
                xstep2 = xstep / 256;
                ystep2 = ystep / 256;

                xhstep2 = xhstep / 256;
                yhstep2 = yhstep / 256;

                /* middle top to bottom. */
                for (i = xhstep; i <= xxsize - xhstep; i += xstep)
                {
                        for (j = 0; j <= yysize; j += ystep)
                        {
                                /* cache often used values */
                                ii = i / 256 + fill_data.xmin;
                                jj = j / 256 + fill_data.ymin;

                                /* Test square */
                                if (floor_ptr->grid_array[jj][ii].feat == -1)
                                {
                                        if (xhstep2 > grd)
                                        {
                                                /* If greater than 'grid' level then is random */
                                                store_height(floor_ptr, ii, jj, randint1(maxsize));
                                        }
                                        else
                                        {
                                                /* Average of left and right points +random bit */
                                                store_height(floor_ptr, ii, jj,
                                                        (floor_ptr->grid_array[jj][fill_data.xmin + (i - xhstep) / 256].feat
                                                                + floor_ptr->grid_array[jj][fill_data.xmin + (i + xhstep) / 256].feat) / 2
                                                        + (randint1(xstep2) - xhstep2) * roug / 16);
                                        }
                                }
                        }
                }


                /* middle left to right. */
                for (j = yhstep; j <= yysize - yhstep; j += ystep)
                {
                        for (i = 0; i <= xxsize; i += xstep)
                        {
                                /* cache often used values */
                                ii = i / 256 + fill_data.xmin;
                                jj = j / 256 + fill_data.ymin;

                                /* Test square */
                                if (floor_ptr->grid_array[jj][ii].feat == -1)
                                {
                                        if (xhstep2 > grd)
                                        {
                                                /* If greater than 'grid' level then is random */
                                                store_height(floor_ptr, ii, jj, randint1(maxsize));
                                        }
                                        else
                                        {
                                                /* Average of up and down points +random bit */
                                                store_height(floor_ptr, ii, jj,
                                                        (floor_ptr->grid_array[fill_data.ymin + (j - yhstep) / 256][ii].feat
                                                                + floor_ptr->grid_array[fill_data.ymin + (j + yhstep) / 256][ii].feat) / 2
                                                        + (randint1(ystep2) - yhstep2) * roug / 16);
                                        }
                                }
                        }
                }

                /* center. */
                for (i = xhstep; i <= xxsize - xhstep; i += xstep)
                {
                        for (j = yhstep; j <= yysize - yhstep; j += ystep)
                        {
                                /* cache often used values */
                                ii = i / 256 + fill_data.xmin;
                                jj = j / 256 + fill_data.ymin;

                                /* Test square */
                                if (floor_ptr->grid_array[jj][ii].feat == -1)
                                {
                                        if (xhstep2 > grd)
                                        {
                                                /* If greater than 'grid' level then is random */
                                                store_height(floor_ptr, ii, jj, randint1(maxsize));
                                        }
                                        else
                                        {
                                                /* Cache reused values. */
                                                xm = fill_data.xmin + (i - xhstep) / 256;
                                                xp = fill_data.xmin + (i + xhstep) / 256;
                                                ym = fill_data.ymin + (j - yhstep) / 256;
                                                yp = fill_data.ymin + (j + yhstep) / 256;

                                                /*
                                                 * Average over all four corners + scale by diagsize to
                                                 * reduce the effect of the square grid on the shape of the fractal
                                                 */
                                                store_height(floor_ptr, ii, jj,
                                                        (floor_ptr->grid_array[ym][xm].feat + floor_ptr->grid_array[yp][xm].feat
                                                                + floor_ptr->grid_array[ym][xp].feat + floor_ptr->grid_array[yp][xp].feat) / 4
                                                        + (randint1(xstep2) - xhstep2) * (diagsize / 16) / 256 * roug);
                                        }
                                }
                        }
                }
        }
}


static bool hack_isnt_wall(player_type *player_ptr, POSITION y, POSITION x, int c1, int c2, int c3, FEAT_IDX feat1, FEAT_IDX feat2, FEAT_IDX feat3, BIT_FLAGS info1, BIT_FLAGS info2, BIT_FLAGS info3)
{
        /*
         * function used to convert from height-map back to the
         *  normal angband floor_ptr->grid_array format
         */
        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        if (floor_ptr->grid_array[y][x].info & CAVE_ICKY)
        {
                /* already done */
                return FALSE;
        }
        else
        {
                /* Show that have looked at this square */
                floor_ptr->grid_array[y][x].info |= (CAVE_ICKY);

                /* Use cutoffs c1-c3 to allocate regions of floor /water/ lava etc. */
                if (floor_ptr->grid_array[y][x].feat <= c1)
                {
                        /* 25% of the time use the other tile : it looks better this way */
                        if (randint1(100) < 75)
                        {
                                floor_ptr->grid_array[y][x].feat = feat1;
                                floor_ptr->grid_array[y][x].info &= ~(CAVE_MASK);
                                floor_ptr->grid_array[y][x].info |= info1;
                                return TRUE;
                        }
                        else
                        {
                                floor_ptr->grid_array[y][x].feat = feat2;
                                floor_ptr->grid_array[y][x].info &= ~(CAVE_MASK);
                                floor_ptr->grid_array[y][x].info |= info2;
                                return TRUE;
                        }
                }
                else if (floor_ptr->grid_array[y][x].feat <= c2)
                {
                        /* 25% of the time use the other tile : it looks better this way */
                        if (randint1(100) < 75)
                        {
                                floor_ptr->grid_array[y][x].feat = feat2;
                                floor_ptr->grid_array[y][x].info &= ~(CAVE_MASK);
                                floor_ptr->grid_array[y][x].info |= info2;
                                return TRUE;
                        }
                        else
                        {
                                floor_ptr->grid_array[y][x].feat = feat1;
                                floor_ptr->grid_array[y][x].info &= ~(CAVE_MASK);
                                floor_ptr->grid_array[y][x].info |= info1;
                                return TRUE;
                        }
                }
                else if (floor_ptr->grid_array[y][x].feat <= c3)
                {
                        floor_ptr->grid_array[y][x].feat = feat3;
                        floor_ptr->grid_array[y][x].info &= ~(CAVE_MASK);
                        floor_ptr->grid_array[y][x].info |= info3;
                        return TRUE;
                }
                /* if greater than cutoff then is a wall */
                else
                {
                        place_bold(player_ptr, y, x, GB_OUTER);
                        return FALSE;
                }
        }
}




/*
 * Quick and nasty fill routine used to find the connected region
 * of floor in the middle of the grids
 */
static void cave_fill(player_type *player_ptr, POSITION y, POSITION x)
{
        int i, j, d;
        POSITION ty, tx;

        int flow_tail = 1;
        int flow_head = 0;


        /*** Start Grid ***/

        /* Enqueue that entry */
        tmp_pos.y[0] = y;
        tmp_pos.x[0] = x;

        /* Now process the queue */
        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        while (flow_head != flow_tail)
        {
                /* Extract the next entry */
                ty = tmp_pos.y[flow_head];
                tx = tmp_pos.x[flow_head];

                /* Forget that entry */
                if (++flow_head == TEMP_MAX) flow_head = 0;

                /* Add the "children" */
                for (d = 0; d < 8; d++)
                {
                        int old_head = flow_tail;

                        /* Child location */
                        j = ty + ddy_ddd[d];
                        i = tx + ddx_ddd[d];

                        /* Paranoia Don't leave the floor_ptr->grid_array */
                        if (!in_bounds(floor_ptr, j, i))
                        {
                                /* affect boundary */
                                floor_ptr->grid_array[j][i].info |= CAVE_ICKY;
                                /*                              return; */
                        }

                        /* If within bounds */
                        else if ((i > fill_data.xmin) && (i < fill_data.xmax)
                                && (j > fill_data.ymin) && (j < fill_data.ymax))
                        {
                                /* If not a wall or floor done before */
                                if (hack_isnt_wall(player_ptr, j, i,
                                        fill_data.c1, fill_data.c2, fill_data.c3,
                                        fill_data.feat1, fill_data.feat2, fill_data.feat3,
                                        fill_data.info1, fill_data.info2, fill_data.info3))
                                {
                                        /* Enqueue that entry */
                                        tmp_pos.y[flow_tail] = (byte)j;
                                        tmp_pos.x[flow_tail] = (byte)i;

                                        /* Advance the queue */
                                        if (++flow_tail == TEMP_MAX) flow_tail = 0;

                                        /* Hack -- Overflow by forgetting new entry */
                                        if (flow_tail == flow_head)
                                        {
                                                flow_tail = old_head;
                                        }
                                        else
                                        {
                                                /* keep tally of size of floor_ptr->grid_array system */
                                                (fill_data.amount)++;
                                        }
                                }
                        }
                        else
                        {
                                /* affect boundary */
                                floor_ptr->grid_array[j][i].info |= CAVE_ICKY;
                        }
                }
        }
}


bool generate_fracave(player_type *player_ptr, POSITION y0, POSITION x0, POSITION xsize, POSITION ysize, int cutoff, bool light, bool room)
{
        POSITION x, y, xhsize, yhsize;
        int i;

        /* offsets to middle from corner */
        xhsize = xsize / 2;
        yhsize = ysize / 2;


        /*
         * select region connected to center of floor_ptr->grid_array system
         * this gets rid of alot of isolated one-sqaures that
         * can make teleport traps instadeaths...
         */

         /* cutoffs */
        fill_data.c1 = cutoff;
        fill_data.c2 = 0;
        fill_data.c3 = 0;

        /* features to fill with */
        fill_data.feat1 = feat_ground_type[randint0(100)];
        fill_data.feat2 = feat_ground_type[randint0(100)];
        fill_data.feat3 = feat_ground_type[randint0(100)];

        fill_data.info1 = CAVE_FLOOR;
        fill_data.info2 = CAVE_FLOOR;
        fill_data.info3 = CAVE_FLOOR;

        /* number of filled squares */
        fill_data.amount = 0;

        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        cave_fill(player_ptr, (byte)y0, (byte)x0);

        /* if tally too small, try again */
        if (fill_data.amount < 10)
        {
                /* too small - clear area and try again later */
                for (x = 0; x <= xsize; ++x)
                {
                        for (y = 0; y <= ysize; ++y)
                        {
                                place_bold(player_ptr, y0 + y - yhsize, x0 + x - xhsize, GB_EXTRA);
                                floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info &= ~(CAVE_ICKY | CAVE_ROOM);
                        }
                }
                return FALSE;
        }

        /*
         * Do boundarys-check to see if they are next to a filled region
         * If not then they are set to normal granite
         * If so then they are marked as room walls.
         */
        for (i = 0; i <= xsize; ++i)
        {
                /* top boundary */
                if ((floor_ptr->grid_array[0 + y0 - yhsize][i + x0 - xhsize].info & CAVE_ICKY) && (room))
                {
                        /* Next to a 'filled' region? - set to be room walls */
                        place_bold(player_ptr, y0 + 0 - yhsize, x0 + i - xhsize, GB_OUTER);
                        if (light) floor_ptr->grid_array[y0 + 0 - yhsize][x0 + i - xhsize].info |= (CAVE_GLOW);
                        floor_ptr->grid_array[y0 + 0 - yhsize][x0 + i - xhsize].info |= (CAVE_ROOM);
                        place_bold(player_ptr, y0 + 0 - yhsize, x0 + i - xhsize, GB_OUTER);
                }
                else
                {
                        /* set to be normal granite */
                        place_bold(player_ptr, y0 + 0 - yhsize, x0 + i - xhsize, GB_EXTRA);
                }

                /* bottom boundary */
                if ((floor_ptr->grid_array[ysize + y0 - yhsize][i + x0 - xhsize].info & CAVE_ICKY) && (room))
                {
                        /* Next to a 'filled' region? - set to be room walls */
                        place_bold(player_ptr, y0 + ysize - yhsize, x0 + i - xhsize, GB_OUTER);
                        if (light) floor_ptr->grid_array[y0 + ysize - yhsize][x0 + i - xhsize].info |= (CAVE_GLOW);
                        floor_ptr->grid_array[y0 + ysize - yhsize][x0 + i - xhsize].info |= (CAVE_ROOM);
                        place_bold(player_ptr, y0 + ysize - yhsize, x0 + i - xhsize, GB_OUTER);
                }
                else
                {
                        /* set to be normal granite */
                        place_bold(player_ptr, y0 + ysize - yhsize, x0 + i - xhsize, GB_EXTRA);
                }

                /* clear the icky flag-don't need it any more */
                floor_ptr->grid_array[y0 + 0 - yhsize][x0 + i - xhsize].info &= ~(CAVE_ICKY);
                floor_ptr->grid_array[y0 + ysize - yhsize][x0 + i - xhsize].info &= ~(CAVE_ICKY);
        }

        /* Do the left and right boundaries minus the corners (done above) */
        for (i = 1; i < ysize; ++i)
        {
                /* left boundary */
                if ((floor_ptr->grid_array[i + y0 - yhsize][0 + x0 - xhsize].info & CAVE_ICKY) && room)
                {
                        /* room boundary */
                        place_bold(player_ptr, y0 + i - yhsize, x0 + 0 - xhsize, GB_OUTER);
                        if (light) floor_ptr->grid_array[y0 + i - yhsize][x0 + 0 - xhsize].info |= (CAVE_GLOW);
                        floor_ptr->grid_array[y0 + i - yhsize][x0 + 0 - xhsize].info |= (CAVE_ROOM);
                        place_bold(player_ptr, y0 + i - yhsize, x0 + 0 - xhsize, GB_OUTER);
                }
                else
                {
                        /* outside room */
                        place_bold(player_ptr, y0 + i - yhsize, x0 + 0 - xhsize, GB_EXTRA);
                }
                /* right boundary */
                if ((floor_ptr->grid_array[i + y0 - yhsize][xsize + x0 - xhsize].info & CAVE_ICKY) && room)
                {
                        /* room boundary */
                        place_bold(player_ptr, y0 + i - yhsize, x0 + xsize - xhsize, GB_OUTER);
                        if (light) floor_ptr->grid_array[y0 + i - yhsize][x0 + xsize - xhsize].info |= (CAVE_GLOW);
                        floor_ptr->grid_array[y0 + i - yhsize][x0 + xsize - xhsize].info |= (CAVE_ROOM);
                        place_bold(player_ptr, y0 + i - yhsize, x0 + xsize - xhsize, GB_OUTER);
                }
                else
                {
                        /* outside room */
                        place_bold(player_ptr, y0 + i - yhsize, x0 + xsize - xhsize, GB_EXTRA);
                }

                /* clear icky flag -done with it */
                floor_ptr->grid_array[y0 + i - yhsize][x0 + 0 - xhsize].info &= ~(CAVE_ICKY);
                floor_ptr->grid_array[y0 + i - yhsize][x0 + xsize - xhsize].info &= ~(CAVE_ICKY);
        }


        /* Do the rest: convert back to the normal format */
        for (x = 1; x < xsize; ++x)
        {
                for (y = 1; y < ysize; ++y)
                {
                        if (is_floor_bold(floor_ptr, y0 + y - yhsize, x0 + x - xhsize) &&
                                (floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info & CAVE_ICKY))
                        {
                                /* Clear the icky flag in the filled region */
                                floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info &= ~CAVE_ICKY;

                                /* Set appropriate flags */
                                if (light) floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info |= (CAVE_GLOW);
                                if (room) floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info |= (CAVE_ROOM);
                        }
                        else if (is_outer_bold(floor_ptr, y0 + y - yhsize, x0 + x - xhsize) &&
                                (floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info & CAVE_ICKY))
                        {
                                /* Walls */
                                floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info &= ~(CAVE_ICKY);
                                if (light) floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info |= (CAVE_GLOW);
                                if (room)
                                {
                                        floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info |= (CAVE_ROOM);
                                }
                                else
                                {

                                        place_bold(player_ptr, y0 + y - yhsize, x0 + x - xhsize, GB_EXTRA);
                                        floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info &= ~(CAVE_ROOM);
                                }
                        }
                        else
                        {
                                /* Clear the unconnected regions */
                                place_bold(player_ptr, y0 + y - yhsize, x0 + x - xhsize, GB_EXTRA);
                                floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info &= ~(CAVE_ICKY | CAVE_ROOM);
                        }
                }
        }

        /*
         * There is a slight problem when tunnels pierce the caves:
         * Extra doors appear inside the system.  (Its not very noticeable though.)
         * This can be removed by "filling" from the outside in.  This allows a separation
         * from _outer_ with _inner_.  (Internal walls are  _outer_ instead.)
         * The extra effort for what seems to be only a minor thing (even non-existant if you
         * think of the caves not as normal rooms, but as holes in the dungeon), doesn't seem
         * worth it.
         */

        return TRUE;
}


/*
 * Builds a cave system in the center of the dungeon.
 */
void build_cavern(player_type *player_ptr)
{
        int grd, roug, cutoff;
        POSITION xsize, ysize, x0, y0;
        bool done, light;

        light = done = FALSE;
        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        if ((floor_ptr->dun_level <= randint1(50)) && !(d_info[floor_ptr->dungeon_idx].flags1 & DF1_DARKNESS)) light = TRUE;

        /* Make a cave the size of the dungeon */
        xsize = floor_ptr->width - 1;
        ysize = floor_ptr->height - 1;
        x0 = xsize / 2;
        y0 = ysize / 2;

        /* Paranoia: make size even */
        xsize = x0 * 2;
        ysize = y0 * 2;

        while (!done)
        {
                /* testing values for these parameters: feel free to adjust */
                grd = randint1(4) + 4;

                /* want average of about 16 */
                roug = randint1(8) * randint1(4);

                /* about size/2 */
                cutoff = xsize / 2;

                /* make it */
                generate_hmap(floor_ptr, y0 + 1, x0 + 1, xsize, ysize, grd, roug, cutoff);

                /* Convert to normal format+ clean up */
                done = generate_fracave(player_ptr, y0 + 1, x0 + 1, xsize, ysize, cutoff, light, FALSE);
        }
}


bool generate_lake(player_type *player_ptr, POSITION y0, POSITION x0, POSITION xsize, POSITION ysize, int c1, int c2, int c3, int type)
{
        POSITION x, y, xhsize, yhsize;
        int i;
        FEAT_IDX feat1, feat2, feat3;

        /* offsets to middle from corner */
        xhsize = xsize / 2;
        yhsize = ysize / 2;

        /* Get features based on type */
        switch (type)
        {
        case LAKE_T_LAVA: /* Lava */
                feat1 = feat_deep_lava;
                feat2 = feat_shallow_lava;
                feat3 = feat_ground_type[randint0(100)];
                break;
        case LAKE_T_WATER: /* Water */
                feat1 = feat_deep_water;
                feat2 = feat_shallow_water;
                feat3 = feat_ground_type[randint0(100)];
                break;
        case LAKE_T_CAVE: /* Collapsed floor_ptr->grid_array */
                feat1 = feat_ground_type[randint0(100)];
                feat2 = feat_ground_type[randint0(100)];
                feat3 = feat_rubble;
                break;
        case LAKE_T_EARTH_VAULT: /* Earth vault */
                feat1 = feat_rubble;
                feat2 = feat_ground_type[randint0(100)];
                feat3 = feat_rubble;
                break;
        case LAKE_T_AIR_VAULT: /* Air vault */
                feat1 = feat_grass;
                feat2 = feat_tree;
                feat3 = feat_grass;
                break;
        case LAKE_T_WATER_VAULT: /* Water vault */
                feat1 = feat_shallow_water;
                feat2 = feat_deep_water;
                feat3 = feat_shallow_water;
                break;
        case LAKE_T_FIRE_VAULT: /* Fire Vault */
                feat1 = feat_shallow_lava;
                feat2 = feat_deep_lava;
                feat3 = feat_shallow_lava;
                break;
        default: return FALSE;
        }

        /*
         * select region connected to center of floor_ptr->grid_array system
         * this gets rid of alot of isolated one-sqaures that
         * can make teleport traps instadeaths...
         */

         /* cutoffs */
        fill_data.c1 = c1;
        fill_data.c2 = c2;
        fill_data.c3 = c3;

        /* features to fill with */
        fill_data.feat1 = feat1;
        fill_data.feat2 = feat2;
        fill_data.feat3 = feat3;

        fill_data.info1 = 0;
        fill_data.info2 = 0;
        fill_data.info3 = 0;

        /* number of filled squares */
        fill_data.amount = 0;

        /* select region connected to center of floor_ptr->grid_array system
        * this gets rid of alot of isolated one-sqaures that
        * can make teleport traps instadeaths... */
        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        cave_fill(player_ptr, (byte)y0, (byte)x0);

        /* if tally too small, try again */
        if (fill_data.amount < 10)
        {
                /* too small -clear area and try again later */
                for (x = 0; x <= xsize; ++x)
                {
                        for (y = 0; y <= ysize; ++y)
                        {
                                place_bold(player_ptr, y0 + y - yhsize, x0 + x - xhsize, GB_FLOOR);
                                floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info &= ~(CAVE_ICKY);
                        }
                }
                return FALSE;
        }

        /* Do boundarys- set to normal granite */
        for (i = 0; i <= xsize; ++i)
        {
                place_bold(player_ptr, y0 + 0 - yhsize, x0 + i - xhsize, GB_EXTRA);
                place_bold(player_ptr, y0 + ysize - yhsize, x0 + i - xhsize, GB_EXTRA);

                /* clear the icky flag-don't need it any more */
                floor_ptr->grid_array[y0 + 0 - yhsize][x0 + i - xhsize].info &= ~(CAVE_ICKY);
                floor_ptr->grid_array[y0 + ysize - yhsize][x0 + i - xhsize].info &= ~(CAVE_ICKY);
        }

        /* Do the left and right boundaries minus the corners (done above) */

        for (i = 1; i < ysize; ++i)
        {
                place_bold(player_ptr, y0 + i - yhsize, x0 + 0 - xhsize, GB_EXTRA);
                place_bold(player_ptr, y0 + i - yhsize, x0 + xsize - xhsize, GB_EXTRA);

                /* clear icky flag -done with it */
                floor_ptr->grid_array[y0 + i - yhsize][x0 + 0 - xhsize].info &= ~(CAVE_ICKY);
                floor_ptr->grid_array[y0 + i - yhsize][x0 + xsize - xhsize].info &= ~(CAVE_ICKY);
        }


        /* Do the rest: convert back to the normal format */
        for (x = 1; x < xsize; ++x)
        {
                for (y = 1; y < ysize; ++y)
                {
                        /* Fill unconnected regions with granite */
                        if ((!(floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info & CAVE_ICKY)) ||
                                is_outer_bold(floor_ptr, y0 + y - yhsize, x0 + x - xhsize))
                                place_bold(player_ptr, y0 + y - yhsize, x0 + x - xhsize, GB_EXTRA);

                        /* turn off icky flag (no longer needed.) */
                        floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info &= ~(CAVE_ICKY | CAVE_ROOM);

                        /* Light lava */
                        if (cave_have_flag_bold(floor_ptr, y0 + y - yhsize, x0 + x - xhsize, FF_LAVA))
                        {
                                if (!(d_info[floor_ptr->dungeon_idx].flags1 & DF1_DARKNESS)) floor_ptr->grid_array[y0 + y - yhsize][x0 + x - xhsize].info |= CAVE_GLOW;
                        }
                }
        }

        return TRUE;
}


/*
 * makes a lake/collapsed floor in the center of the dungeon
 */
void build_lake(player_type *player_ptr, int type)
{
        int grd, roug, xsize, ysize, x0, y0;
        bool done = FALSE;
        int c1, c2, c3;

        /* paranoia - exit if lake type out of range. */
        if ((type < LAKE_T_LAVA) || (type > LAKE_T_FIRE_VAULT))
        {
                msg_format("Invalid lake type (%d)", type);
                return;
        }

        /* Make the size of the dungeon */
        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        xsize = floor_ptr->width - 1;
        ysize = floor_ptr->height - 1;
        x0 = xsize / 2;
        y0 = ysize / 2;

        /* Paranoia: make size even */
        xsize = x0 * 2;
        ysize = y0 * 2;

        while (!done)
        {
                /* testing values for these parameters: feel free to adjust */
                grd = randint1(3) + 4;

                /* want average of about 16 */
                roug = randint1(8) * randint1(4);

                /* Make up size of various componants */
                /* Floor */
                c3 = 3 * xsize / 4;

                /* Deep water/lava */
                c1 = randint0(c3 / 2) + randint0(c3 / 2) - 5;

                /* Shallow boundary */
                c2 = (c1 + c3) / 2;

                /* make it */
                generate_hmap(floor_ptr, y0 + 1, x0 + 1, xsize, ysize, grd, roug, c3);

                /* Convert to normal format+ clean up */
                done = generate_lake(player_ptr, y0 + 1, x0 + 1, xsize, ysize, c1, c2, c3, type);
        }
}


/*
 * Routine that fills the empty areas of a room with treasure and monsters.
 */
void fill_treasure(player_type *player_ptr, POSITION x1, POSITION x2, POSITION y1, POSITION y2, int difficulty)
{
        POSITION x, y, cx, cy, size;
        s32b value;

        /* center of room:*/
        cx = (x1 + x2) / 2;
        cy = (y1 + y2) / 2;

        /* Rough measure of size of vault= sum of lengths of sides */
        size = abs(x2 - x1) + abs(y2 - y1);

        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        for (x = x1; x <= x2; x++)
        {
                for (y = y1; y <= y2; y++)
                {
                        /* Thing added based on distance to center of vault
                         * Difficulty is 1-easy to 10-hard */
                        value = ((((s32b)(distance(cx, cy, x, y))) * 100) / size) + randint1(10) - difficulty;

                        /* hack- empty square part of the time */
                        if ((randint1(100) - difficulty * 3) > 50) value = 20;

                        /* if floor, shallow water and lava */
                        if (is_floor_bold(floor_ptr, y, x) ||
                                (cave_have_flag_bold(floor_ptr, y, x, FF_PLACE) && cave_have_flag_bold(floor_ptr, y, x, FF_DROP)))
                        {
                                /* The smaller 'value' is, the better the stuff */
                                if (value < 0)
                                {
                                        /* Meanest monster + treasure */
                                        floor_ptr->monster_level = floor_ptr->base_level + 40;
                                        place_monster(player_ptr, y, x, (PM_ALLOW_SLEEP | PM_ALLOW_GROUP));
                                        floor_ptr->monster_level = floor_ptr->base_level;
                                        floor_ptr->object_level = floor_ptr->base_level + 20;
                                        place_object(player_ptr, y, x, AM_GOOD);
                                        floor_ptr->object_level = floor_ptr->base_level;
                                }
                                else if (value < 5)
                                {
                                        /* Mean monster +treasure */
                                        floor_ptr->monster_level = floor_ptr->base_level + 20;
                                        place_monster(player_ptr, y, x, (PM_ALLOW_SLEEP | PM_ALLOW_GROUP));
                                        floor_ptr->monster_level = floor_ptr->base_level;
                                        floor_ptr->object_level = floor_ptr->base_level + 10;
                                        place_object(player_ptr, y, x, AM_GOOD);
                                        floor_ptr->object_level = floor_ptr->base_level;
                                }
                                else if (value < 10)
                                {
                                        floor_ptr->monster_level = floor_ptr->base_level + 9;
                                        place_monster(player_ptr, y, x, (PM_ALLOW_SLEEP | PM_ALLOW_GROUP));
                                        floor_ptr->monster_level = floor_ptr->base_level;
                                }
                                else if (value < 17)
                                {
                                        /* Intentional Blank space */

                                        /*
                                         * (Want some of the vault to be empty
                                         * so have room for group monsters.
                                         * This is used in the hack above to lower
                                         * the density of stuff in the vault.)
                                         */
                                }
                                else if (value < 23)
                                {
                                        /* Object or trap */
                                        if (randint0(100) < 25)
                                        {
                                                place_object(player_ptr, y, x, 0L);
                                        }
                                        else
                                        {
                                                place_trap(player_ptr, y, x);
                                        }
                                }
                                else if (value < 30)
                                {
                                        /* Monster and trap */
                                        floor_ptr->monster_level = floor_ptr->base_level + 5;
                                        place_monster(player_ptr, y, x, (PM_ALLOW_SLEEP | PM_ALLOW_GROUP));
                                        floor_ptr->monster_level = floor_ptr->base_level;
                                        place_trap(player_ptr, y, x);
                                }
                                else if (value < 40)
                                {
                                        /* Monster or object */
                                        if (randint0(100) < 50)
                                        {
                                                floor_ptr->monster_level = floor_ptr->base_level + 3;
                                                place_monster(player_ptr, y, x, (PM_ALLOW_SLEEP | PM_ALLOW_GROUP));
                                                floor_ptr->monster_level = floor_ptr->base_level;
                                        }
                                        if (randint0(100) < 50)
                                        {
                                                floor_ptr->object_level = floor_ptr->base_level + 7;
                                                place_object(player_ptr, y, x, 0L);
                                                floor_ptr->object_level = floor_ptr->base_level;
                                        }
                                }
                                else if (value < 50)
                                {
                                        /* Trap */
                                        place_trap(player_ptr, y, x);
                                }
                                else
                                {
                                        /* Various Stuff */

                                        /* 20% monster, 40% trap, 20% object, 20% blank space */
                                        if (randint0(100) < 20)
                                        {
                                                place_monster(player_ptr, y, x, (PM_ALLOW_SLEEP | PM_ALLOW_GROUP));
                                        }
                                        else if (randint0(100) < 50)
                                        {
                                                place_trap(player_ptr, y, x);
                                        }
                                        else if (randint0(100) < 50)
                                        {
                                                place_object(player_ptr, y, x, 0L);
                                        }
                                }

                        }
                }
        }
}


/*
 * Overlay a rectangular room given its bounds
 * This routine is used by build_room_vault
 * The area inside the walls is not touched:
 * only granite is removed- normal walls stay
 */
void build_room(player_type *player_ptr, POSITION x1, POSITION x2, POSITION y1, POSITION y2)
{
        POSITION x, y, xsize, ysize;
        int i, temp;

        /* Check if rectangle has no width */
        if ((x1 == x2) || (y1 == y2)) return;

        if (x1 > x2)
        {
                /* Swap boundaries if in wrong order */
                temp = x1;
                x1 = x2;
                x2 = temp;
        }

        if (y1 > y2)
        {
                /* Swap boundaries if in wrong order */
                temp = y1;
                y1 = y2;
                y2 = temp;
        }

        /* get total widths */
        xsize = x2 - x1;
        ysize = y2 - y1;


        /* Top and bottom boundaries */
        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        for (i = 0; i <= xsize; i++)
        {
                place_bold(player_ptr, y1, x1 + i, GB_OUTER_NOPERM);
                floor_ptr->grid_array[y1][x1 + i].info |= (CAVE_ROOM | CAVE_ICKY);
                place_bold(player_ptr, y2, x1 + i, GB_OUTER_NOPERM);
                floor_ptr->grid_array[y2][x1 + i].info |= (CAVE_ROOM | CAVE_ICKY);
        }

        /* Left and right boundaries */
        for (i = 1; i < ysize; i++)
        {
                place_bold(player_ptr, y1 + i, x1, GB_OUTER_NOPERM);
                floor_ptr->grid_array[y1 + i][x1].info |= (CAVE_ROOM | CAVE_ICKY);
                place_bold(player_ptr, y1 + i, x2, GB_OUTER_NOPERM);
                floor_ptr->grid_array[y1 + i][x2].info |= (CAVE_ROOM | CAVE_ICKY);
        }

        /* Middle */
        for (x = 1; x < xsize; x++)
        {
                for (y = 1; y < ysize; y++)
                {
                        if (is_extra_bold(floor_ptr, y1 + y, x1 + x))
                        {
                                /* clear the untouched region */
                                place_bold(player_ptr, y1 + y, x1 + x, GB_FLOOR);
                                floor_ptr->grid_array[y1 + y][x1 + x].info |= (CAVE_ROOM | CAVE_ICKY);
                        }
                        else
                        {
                                /* make it a room- but don't touch */
                                floor_ptr->grid_array[y1 + y][x1 + x].info |= (CAVE_ROOM | CAVE_ICKY);
                        }
                }
        }
}



/*
 * maze vault -- rectangular labyrinthine rooms
 *
 * maze vault uses two routines:
 *    r_visit - a recursive routine that builds the labyrinth
 *    build_maze_vault - a driver routine that calls r_visit and adds
 *                   monsters, traps and treasure
 *
 * The labyrinth is built by creating a spanning tree of a graph.
 * The graph vertices are at
 *    (x, y) = (2j + x1, 2k + y1)   j = 0,...,m-1    k = 0,...,n-1
 * and the edges are the vertical and horizontal nearest neighbors.
 *
 * The spanning tree is created by performing a suitably randomized
 * depth-first traversal of the graph. The only adjustable parameter
 * is the randint0(3) below; it governs the relative density of
 * twists and turns in the labyrinth: smaller number, more twists.
 */
void r_visit(player_type *player_ptr, POSITION y1, POSITION x1, POSITION y2, POSITION x2, int node, DIRECTION dir, int *visited)
{
        int i, j, m, n, temp, x, y, adj[4];

        /* dimensions of vertex array */
        m = (x2 - x1) / 2 + 1;
        n = (y2 - y1) / 2 + 1;

        /* mark node visited and set it to a floor */
        visited[node] = 1;
        x = 2 * (node % m) + x1;
        y = 2 * (node / m) + y1;
        place_bold(player_ptr, y, x, GB_FLOOR);

        /* setup order of adjacent node visits */
        if (one_in_(3))
        {
                /* pick a random ordering */
                for (i = 0; i < 4; i++)
                        adj[i] = i;
                for (i = 0; i < 4; i++)
                {
                        j = randint0(4);
                        temp = adj[i];
                        adj[i] = adj[j];
                        adj[j] = temp;
                }
                dir = adj[0];
        }
        else
        {
                /* pick a random ordering with dir first */
                adj[0] = dir;
                for (i = 1; i < 4; i++)
                        adj[i] = i;
                for (i = 1; i < 4; i++)
                {
                        j = 1 + randint0(3);
                        temp = adj[i];
                        adj[i] = adj[j];
                        adj[j] = temp;
                }
        }

        for (i = 0; i < 4; i++)
        {
                switch (adj[i])
                {
                case 0:
                        /* (0,+) - check for bottom boundary */
                        if ((node / m < n - 1) && (visited[node + m] == 0))
                        {
                                place_bold(player_ptr, y + 1, x, GB_FLOOR);
                                r_visit(player_ptr, y1, x1, y2, x2, node + m, dir, visited);
                        }
                        break;
                case 1:
                        /* (0,-) - check for top boundary */
                        if ((node / m > 0) && (visited[node - m] == 0))
                        {
                                place_bold(player_ptr, y - 1, x, GB_FLOOR);
                                r_visit(player_ptr, y1, x1, y2, x2, node - m, dir, visited);
                        }
                        break;
                case 2:
                        /* (+,0) - check for right boundary */
                        if ((node % m < m - 1) && (visited[node + 1] == 0))
                        {
                                place_bold(player_ptr, y, x + 1, GB_FLOOR);
                                r_visit(player_ptr, y1, x1, y2, x2, node + 1, dir, visited);
                        }
                        break;
                case 3:
                        /* (-,0) - check for left boundary */
                        if ((node % m > 0) && (visited[node - 1] == 0))
                        {
                                place_bold(player_ptr, y, x - 1, GB_FLOOR);
                                r_visit(player_ptr, y1, x1, y2, x2, node - 1, dir, visited);
                        }
                } /* end switch */
        }
}


void build_maze_vault(player_type *player_ptr, POSITION x0, POSITION y0, POSITION xsize, POSITION ysize, bool is_vault)
{
        POSITION y, x, dy, dx;
        POSITION y1, x1, y2, x2;
        int m, n, num_vertices, *visited;
        bool light;
        grid_type *g_ptr;

        msg_print_wizard(CHEAT_DUNGEON, _("迷路ランダムVaultを生成しました。", "Maze Vault."));

        /* Choose lite or dark */
        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        light = ((floor_ptr->dun_level <= randint1(25)) && is_vault && !(d_info[floor_ptr->dungeon_idx].flags1 & DF1_DARKNESS));

        /* Pick a random room size - randomized by calling routine */
        dy = ysize / 2 - 1;
        dx = xsize / 2 - 1;

        y1 = y0 - dy;
        x1 = x0 - dx;
        y2 = y0 + dy;
        x2 = x0 + dx;

        /* generate the room */
        for (y = y1 - 1; y <= y2 + 1; y++)
        {
                for (x = x1 - 1; x <= x2 + 1; x++)
                {
                        g_ptr = &floor_ptr->grid_array[y][x];
                        g_ptr->info |= CAVE_ROOM;
                        if (is_vault) g_ptr->info |= CAVE_ICKY;
                        if ((x == x1 - 1) || (x == x2 + 1) || (y == y1 - 1) || (y == y2 + 1))
                        {
                                place_grid(player_ptr, g_ptr, GB_OUTER);
                        }
                        else if (!is_vault)
                        {
                                place_grid(player_ptr, g_ptr, GB_EXTRA);
                        }
                        else
                        {
                                place_grid(player_ptr, g_ptr, GB_INNER);
                        }
                        if (light) g_ptr->info |= (CAVE_GLOW);
                }
        }

        /* dimensions of vertex array */
        m = dx + 1;
        n = dy + 1;
        num_vertices = m * n;

        /* initialize array of visited vertices */
        C_MAKE(visited, num_vertices, int);

        /* traverse the graph to create a spaning tree, pick a random root */
        r_visit(player_ptr, y1, x1, y2, x2, randint0(num_vertices), 0, visited);

        /* Fill with monsters and treasure, low difficulty */
        if (is_vault) fill_treasure(player_ptr, x1, x2, y1, y2, randint1(5));

        C_KILL(visited, num_vertices, int);
}


/* Build a town/ castle by using a recursive algorithm.
 * Basically divide each region in a probalistic way to create
 * smaller regions.  When the regions get too small stop.
 *
 * The power variable is a measure of how well defended a region is.
 * This alters the possible choices.
 */
void build_recursive_room(player_type *player_ptr, POSITION x1, POSITION y1, POSITION x2, POSITION y2, int power)
{
        POSITION xsize, ysize;
        POSITION x, y;
        int choice;

        /* Temp variables */
        int t1, t2, t3, t4;

        xsize = x2 - x1;
        ysize = y2 - y1;

        if ((power < 3) && (xsize > 12) && (ysize > 12))
        {
                /* Need outside wall +keep */
                choice = 1;
        }
        else
        {
                if (power < 10)
                {
                        /* Make rooms + subdivide */
                        if ((randint1(10) > 2) && (xsize < 8) && (ysize < 8))
                        {
                                choice = 4;
                        }
                        else
                        {
                                choice = randint1(2) + 1;
                        }
                }
                else
                {
                        /* Mostly subdivide */
                        choice = randint1(3) + 1;
                }
        }

        /* Based on the choice made above, do something */
        switch (choice)
        {
        case 1:
        {
                /* Outer walls */

                /* top and bottom */
                for (x = x1; x <= x2; x++)
                {
                        place_bold(player_ptr, y1, x, GB_OUTER);
                        place_bold(player_ptr, y2, x, GB_OUTER);
                }

                /* left and right */
                for (y = y1 + 1; y < y2; y++)
                {
                        place_bold(player_ptr, y, x1, GB_OUTER);
                        place_bold(player_ptr, y, x2, GB_OUTER);
                }

                /* Make a couple of entrances */
                if (one_in_(2))
                {
                        /* left and right */
                        y = randint1(ysize) + y1;
                        place_bold(player_ptr, y, x1, GB_FLOOR);
                        place_bold(player_ptr, y, x2, GB_FLOOR);
                }
                else
                {
                        /* top and bottom */
                        x = randint1(xsize) + x1;
                        place_bold(player_ptr, y1, x, GB_FLOOR);
                        place_bold(player_ptr, y2, x, GB_FLOOR);
                }

                /* Select size of keep */
                t1 = randint1(ysize / 3) + y1;
                t2 = y2 - randint1(ysize / 3);
                t3 = randint1(xsize / 3) + x1;
                t4 = x2 - randint1(xsize / 3);

                /* Do outside areas */

                /* Above and below keep */
                build_recursive_room(player_ptr, x1 + 1, y1 + 1, x2 - 1, t1, power + 1);
                build_recursive_room(player_ptr, x1 + 1, t2, x2 - 1, y2, power + 1);

                /* Left and right of keep */
                build_recursive_room(player_ptr, x1 + 1, t1 + 1, t3, t2 - 1, power + 3);
                build_recursive_room(player_ptr, t4, t1 + 1, x2 - 1, t2 - 1, power + 3);

                /* Make the keep itself: */
                x1 = t3;
                x2 = t4;
                y1 = t1;
                y2 = t2;
                xsize = x2 - x1;
                ysize = y2 - y1;
                power += 2;
        }
                /* Fall through */

        case 4:
        {
                /* Try to build a room */
                if ((xsize < 3) || (ysize < 3))
                {
                        for (y = y1; y < y2; y++)
                        {
                                for (x = x1; x < x2; x++)
                                {
                                        place_bold(player_ptr, y, x, GB_INNER);
                                }
                        }

                        /* Too small */
                        return;
                }

                /* Make outside walls */
                /* top and bottom */
                for (x = x1 + 1; x <= x2 - 1; x++)
                {
                        place_bold(player_ptr, y1 + 1, x, GB_INNER);
                        place_bold(player_ptr, y2 - 1, x, GB_INNER);
                }

                /* left and right */
                for (y = y1 + 1; y <= y2 - 1; y++)
                {
                        place_bold(player_ptr, y, x1 + 1, GB_INNER);
                        place_bold(player_ptr, y, x2 - 1, GB_INNER);
                }

                /* Make a door */
                y = randint1(ysize - 3) + y1 + 1;

                if (one_in_(2))
                {
                        /* left */
                        place_bold(player_ptr, y, x1 + 1, GB_FLOOR);
                }
                else
                {
                        /* right */
                        place_bold(player_ptr, y, x2 - 1, GB_FLOOR);
                }

                /* Build the room */
                build_recursive_room(player_ptr, x1 + 2, y1 + 2, x2 - 2, y2 - 2, power + 3);
                break;
        }
        case 2:
        {
                /* Try and divide vertically */
                if (xsize < 3)
                {
                        /* Too small */
                        for (y = y1; y < y2; y++)
                        {
                                for (x = x1; x < x2; x++)
                                {
                                        place_bold(player_ptr, y, x, GB_INNER);
                                }
                        }
                        return;
                }

                t1 = randint1(xsize - 2) + x1 + 1;
                build_recursive_room(player_ptr, x1, y1, t1, y2, power - 2);
                build_recursive_room(player_ptr, t1 + 1, y1, x2, y2, power - 2);
                break;
        }
        case 3:
        {
                /* Try and divide horizontally */
                if (ysize < 3)
                {
                        /* Too small */
                        for (y = y1; y < y2; y++)
                        {
                                for (x = x1; x < x2; x++)
                                {
                                        place_bold(player_ptr, y, x, GB_INNER);
                                }
                        }
                        return;
                }

                t1 = randint1(ysize - 2) + y1 + 1;
                build_recursive_room(player_ptr, x1, y1, x2, t1, power - 2);
                build_recursive_room(player_ptr, x1, t1 + 1, x2, y2, power - 2);
                break;
        }
        }
}


/*
 * Add outer wall to a floored region
 * Note: no range checking is done so must be inside dungeon
 * This routine also stomps on doors
 */
void add_outer_wall(player_type *player_ptr, POSITION x, POSITION y, int light, POSITION x1, POSITION y1, POSITION x2, POSITION y2)
{
        grid_type *g_ptr;
        feature_type *f_ptr;
        int i, j;

        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        if (!in_bounds(floor_ptr, y, x)) return;

        g_ptr = &floor_ptr->grid_array[y][x];

        /* hack- check to see if square has been visited before
        * if so, then exit (use room flag to do this) */
        if (g_ptr->info & CAVE_ROOM) return;

        /* set room flag */
        g_ptr->info |= CAVE_ROOM;

        f_ptr = &f_info[g_ptr->feat];

        if (is_floor_bold(floor_ptr, y, x))
        {
                for (i = -1; i <= 1; i++)
                {
                        for (j = -1; j <= 1; j++)
                        {
                                if ((x + i >= x1) && (x + i <= x2) && (y + j >= y1) && (y + j <= y2))
                                {
                                        add_outer_wall(player_ptr, x + i, y + j, light, x1, y1, x2, y2);
                                        if (light) g_ptr->info |= CAVE_GLOW;
                                }
                        }
                }
        }
        else if (is_extra_bold(floor_ptr, y, x))
        {
                /* Set bounding walls */
                place_bold(player_ptr, y, x, GB_OUTER);
                if (light) g_ptr->info |= CAVE_GLOW;
        }
        else if (permanent_wall(f_ptr))
        {
                /* Set bounding walls */
                if (light) g_ptr->info |= CAVE_GLOW;
        }
}


/*
 * Hacked distance formula - gives the 'wrong' answer.
 * Used to build crypts
 */
POSITION dist2(POSITION x1, POSITION y1, POSITION x2, POSITION y2, POSITION h1, POSITION h2, POSITION h3, POSITION h4)
{
        POSITION dx, dy;
        dx = abs(x2 - x1);
        dy = abs(y2 - y1);

        /* Basically this works by taking the normal pythagorean formula
         * and using an expansion to express this in a way without the
         * square root.  This approximate formula is then perturbed to give
         * the distorted results.  (I found this by making a mistake when I was
         * trying to fix the circular rooms.)
         */

         /* h1-h4 are constants that describe the metric */
        if (dx >= 2 * dy) return (dx + (dy * h1) / h2);
        if (dy >= 2 * dx) return (dy + (dx * h1) / h2);
        return (((dx + dy) * 128) / 181 +
                (dx * dx / (dy * h3) + dy * dy / (dx * h3)) * h4);
        /* 128/181 is approx. 1/sqrt(2) */
}




/* Create a new floor room with optional light */
void generate_room_floor(player_type *player_ptr, POSITION y1, POSITION x1, POSITION y2, POSITION x2, int light)
{
        POSITION y, x;

        grid_type *g_ptr;

        for (y = y1; y <= y2; y++)
        {
                for (x = x1; x <= x2; x++)
                {
                        /* Point to grid */
                        g_ptr = &player_ptr->current_floor_ptr->grid_array[y][x];
                        place_grid(player_ptr, g_ptr, GB_FLOOR);
                        g_ptr->info |= (CAVE_ROOM);
                        if (light) g_ptr->info |= (CAVE_GLOW);
                }
        }
}

void generate_fill_perm_bold(player_type *player_ptr, POSITION y1, POSITION x1, POSITION y2, POSITION x2)
{
        POSITION y, x;

        for (y = y1; y <= y2; y++)
        {
                for (x = x1; x <= x2; x++)
                {
                        /* Point to grid */
                        place_bold(player_ptr, y, x, GB_INNER_PERM);
                }
        }
}


/*!
 * @brief 与えられた部屋型IDに応じて部屋の生成処理分岐を行い結果を返す / Attempt to build a room of the given type at the given block
 * @param player_ptr プレーヤーへの参照ポインタ
 * @param type 部屋型ID
 * @note that we restrict the number of "crowded" rooms to reduce the chance of overflowing the monster list during level creation.
 * @return 部屋の生成に成功した場合 TRUE を返す。
 */
static bool room_build(player_type *player_ptr, EFFECT_ID typ)
{
        switch (typ)
        {
                /* Build an appropriate room */
        case ROOM_T_NORMAL:        return build_type1(player_ptr);
        case ROOM_T_OVERLAP:       return build_type2(player_ptr);
        case ROOM_T_CROSS:         return build_type3(player_ptr);
        case ROOM_T_INNER_FEAT:    return build_type4(player_ptr);
        case ROOM_T_NEST:          return build_type5(player_ptr);
        case ROOM_T_PIT:           return build_type6(player_ptr);
        case ROOM_T_LESSER_VAULT:  return build_type7(player_ptr);
        case ROOM_T_GREATER_VAULT: return build_type8(player_ptr);
        case ROOM_T_FRACAVE:       return build_type9(player_ptr);
        case ROOM_T_RANDOM_VAULT:  return build_type10(player_ptr);
        case ROOM_T_OVAL:          return build_type11(player_ptr);
        case ROOM_T_CRYPT:         return build_type12(player_ptr);
        case ROOM_T_TRAP_PIT:      return build_type13(player_ptr);
        case ROOM_T_TRAP:          return build_type14(player_ptr);
        case ROOM_T_GLASS:         return build_type15(player_ptr);
        case ROOM_T_ARCADE:        return build_type16(player_ptr);
        case ROOM_T_FIXED:         return build_type17(player_ptr);
        }
        return FALSE;
}

/*!
 * @brief 指定した部屋の生成確率を別の部屋に加算し、指定した部屋の生成率を0にする
 * @param dst 確率を移す先の部屋種ID
 * @param src 確率を与える元の部屋種ID
 */
#define MOVE_PLIST(dst, src) (prob_list[dst] += prob_list[src], prob_list[src] = 0) 

 /*!
  * @brief 部屋生成処理のメインルーチン(Sangbandを経由してOangbandからの実装を引用) / Generate rooms in dungeon.  Build bigger rooms at first.　[from SAngband (originally from OAngband)]
  * @param player_ptr プレーヤーへの参照ポインタ
  * @return 部屋生成に成功した場合 TRUE を返す。
  */
bool generate_rooms(player_type *player_ptr)
{
        floor_type *floor_ptr = player_ptr->current_floor_ptr;
        int i;
        bool remain;
        int crowded = 0;
        int total_prob;
        int prob_list[ROOM_T_MAX];
        int rooms_built = 0;
        int area_size = 100 * (floor_ptr->height*floor_ptr->width) / (MAX_HGT*MAX_WID);
        int level_index = MIN(10, div_round(floor_ptr->dun_level, 10));

        /* Number of each type of room on this level */
        s16b room_num[ROOM_T_MAX];

        /* Limit number of rooms */
        int dun_rooms = DUN_ROOMS_MAX * area_size / 100;

        /* Assume normal floor_ptr->grid_array */
        room_info_type *room_info_ptr = room_info_normal;

        /*
         * Initialize probability list.
         */
        for (i = 0; i < ROOM_T_MAX; i++)
        {
                /* No rooms allowed above their minimum depth. */
                if (floor_ptr->dun_level < room_info_ptr[i].min_level)
                {
                        prob_list[i] = 0;
                }
                else
                {
                        prob_list[i] = room_info_ptr[i].prob[level_index];
                }
        }

        /*
         * XXX -- Various dungeon types and options.
         */

         /*! @details ダンジョンにBEGINNER、CHAMELEON、SMALLESTいずれのフラグもなく、
          * かつ「常に通常でない部屋を生成する」フラグがONならば、
          * GRATER_VAULTのみを生成対象とする。 / Ironman sees only Greater Vaults */
        if (ironman_rooms && !((d_info[floor_ptr->dungeon_idx].flags1 & (DF1_BEGINNER | DF1_CHAMELEON | DF1_SMALLEST))))
        {
                for (i = 0; i < ROOM_T_MAX; i++)
                {
                        if (i == ROOM_T_GREATER_VAULT) prob_list[i] = 1;
                        else prob_list[i] = 0;
                }
        }

        /*! @details ダンジョンにNO_VAULTフラグがあるならば、LESSER_VAULT / GREATER_VAULT/ RANDOM_VAULTを除外 / Forbidden vaults */
        else if (d_info[floor_ptr->dungeon_idx].flags1 & DF1_NO_VAULT)
        {
                prob_list[ROOM_T_LESSER_VAULT] = 0;
                prob_list[ROOM_T_GREATER_VAULT] = 0;
                prob_list[ROOM_T_RANDOM_VAULT] = 0;
        }

        /*! @details ダンジョンにBEGINNERフラグがあるならば、FIXED_ROOMを除外 / Forbidden vaults */
        if (d_info[floor_ptr->dungeon_idx].flags1 & DF1_BEGINNER)
        {
                prob_list[ROOM_T_FIXED] = 0;
        }

        /*! @details ダンジョンにNO_CAVEフラグがある場合、FRACAVEの生成枠がNORMALに与えられる。CRIPT、OVALの生成枠がINNER_Fに与えられる。/ NO_CAVE dungeon (Castle)*/
        if (d_info[floor_ptr->dungeon_idx].flags1 & DF1_NO_CAVE)
        {
                MOVE_PLIST(ROOM_T_NORMAL, ROOM_T_FRACAVE);
                MOVE_PLIST(ROOM_T_INNER_FEAT, ROOM_T_CRYPT);
                MOVE_PLIST(ROOM_T_INNER_FEAT, ROOM_T_OVAL);
        }

        /*! @details ダンジョンにCAVEフラグがある場合、NORMALの生成枠がFRACAVEに与えられる。/ CAVE dungeon (Orc floor_ptr->grid_array etc.) */
        else if (d_info[floor_ptr->dungeon_idx].flags1 & DF1_CAVE)
        {
                MOVE_PLIST(ROOM_T_FRACAVE, ROOM_T_NORMAL);
        }

        /*! @details ダンジョンの基本地形が最初から渓谷かアリーナ型の場合 FRACAVE は生成から除外。 /  No caves when a (random) cavern exists: they look bad */
        else if (dun->cavern || dun->empty_level)
        {
                prob_list[ROOM_T_FRACAVE] = 0;
        }

        /*! @details ダンジョンに最初からGLASS_ROOMフラグがある場合、GLASS を生成から除外。/ Forbidden glass rooms */
        if (!(d_info[floor_ptr->dungeon_idx].flags1 & DF1_GLASS_ROOM))
        {
                prob_list[ROOM_T_GLASS] = 0;
        }

        /*! @details ARCADEは同フラグがダンジョンにないと生成されない。 / Forbidden glass rooms */
        if (!(d_info[floor_ptr->dungeon_idx].flags1 & DF1_ARCADE))
        {
                prob_list[ROOM_T_ARCADE] = 0;
        }

        /*
         * Initialize number of rooms,
         * And calcurate total probability.
         */
        for (total_prob = 0, i = 0; i < ROOM_T_MAX; i++)
        {
                room_num[i] = 0;
                total_prob += prob_list[i];
        }

        /*
         * Prepare the number of rooms, of all types, we should build
         * on this level.
         */
        for (i = dun_rooms; i > 0; i--)
        {
                int room_type;
                int rand = randint0(total_prob);

                /* Get room_type randomly */
                for (room_type = 0; room_type < ROOM_T_MAX; room_type++)
                {
                        if (rand < prob_list[room_type]) break;
                        else rand -= prob_list[room_type];
                }
                if (room_type >= ROOM_T_MAX) room_type = ROOM_T_NORMAL;

                /* Increase the number of rooms of that type we should build. */
                room_num[room_type]++;

                switch (room_type)
                {
                case ROOM_T_NEST:
                case ROOM_T_PIT:
                case ROOM_T_LESSER_VAULT:
                case ROOM_T_TRAP_PIT:
                case ROOM_T_GLASS:
                case ROOM_T_ARCADE:

                        /* Large room */
                        i -= 2;
                        break;

                case ROOM_T_GREATER_VAULT:
                case ROOM_T_RANDOM_VAULT:

                        /* Largest room */
                        i -= 3;
                        break;
                }
        }

        /*
         * Build each type of room one by one until we cannot build any more.
         * [from SAngband (originally from OAngband)]
         */
        while (TRUE)
        {
                /* Assume no remaining rooms */
                remain = FALSE;

                for (i = 0; i < ROOM_T_MAX; i++)
                {
                        /* What type of room are we building now? */
                        int room_type = room_build_order[i];

                        /* Go next if none available */
                        if (!room_num[room_type]) continue;

                        /* Use up one unit */
                        room_num[room_type]--;

                        /* Build the room. */
                        if (room_build(player_ptr, room_type))
                        {
                                /* Increase the room built count. */
                                rooms_built++;

                                /* Mark as there was some remaining rooms */
                                remain = TRUE;

                                switch (room_type)
                                {
                                case ROOM_T_PIT:
                                case ROOM_T_NEST:
                                case ROOM_T_TRAP_PIT:

                                        /* Avoid too many monsters */
                                        if (++crowded >= 2)
                                        {
                                                room_num[ROOM_T_PIT] = 0;
                                                room_num[ROOM_T_NEST] = 0;
                                                room_num[ROOM_T_TRAP_PIT] = 0;
                                        }
                                        break;

                                case ROOM_T_ARCADE:

                                        /* Avoid double-town */
                                        room_num[ROOM_T_ARCADE] = 0;
                                        break;
                                }
                        }
                }

                /* End loop if no room remain */
                if (!remain) break;
        }

        /*! @details 部屋生成数が2未満の場合生成失敗を返す */
        if (rooms_built < 2)
        {
                msg_format_wizard(CHEAT_DUNGEON, _("部屋数が2未満でした。生成を再試行します。", "Number of rooms was under 2. Retry."), rooms_built);
                return FALSE;
        }

        msg_format_wizard(CHEAT_DUNGEON, _("このダンジョンの部屋数は %d です。", "Number of Rooms: %d"), rooms_built);

        return TRUE;
}