server/random_maps/layout.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) Crossfire Development Team (restored, original file without copyright notice)
 * 
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

#include <global.h>
#include <random_map.h>
#include <rproto.h>

void
layout::alloc (int w, int h)
{
  assert (sizeof (cell) == 1);

  this->w = w;
  this->h = h;

  // we store the layout in a single contiguous memory layout
  // first part consists of pointers to each column, followed
  // by the actual columns (not rows!)
  int size = (sizeof (cell *) + sizeof (cell) * h) * w;

  data = (cell **)salloc<char> (size);

  cell *p = (cell *)(data + w);

  for (int x = w; x--; )
    data [x] = p + x * h;
}

layout::layout (int w, int h)
{
  alloc (w, h);
}

layout::layout (layout &copy)
{
  alloc (copy.w, copy.h);

  memcpy (data [0], copy.data [0], sizeof (cell) * h * w);
}

layout::~layout ()
{
  int size = (sizeof (cell *) + sizeof (cell) * h) * w;

  sfree ((char *)data, size);
}

void
layout::fill (char fill)
{
  memset (data [0], fill, w * h);
}

void
layout::rect (int x1, int y1, int x2, int y2, char fill)
{
  --x2;

  memset (data [x1] + y1, fill, y2 - y1);
  memset (data [x2] + y1, fill, y2 - y1);

  while (++x1 < x2)
    data [x1][y1] = data [x1][y2 - 1] = fill;
}

void
layout::fill_rect (int x1, int y1, int x2, int y2, char fill)
{
  for (; x1 < x2; ++x1)
    memset (data [x1] + y1, fill, y2 - y1);
}

void layout::border (char fill)
{
  rect (0, 0, w, h, fill);
}

void
layout::fill_rand (int percent)
{
  percent = lerp (percent, 0, 100, 0, 256);

  for (int x = w - 1; --x > 0; )
    for (int y = h - 1; --y > 0; )
      data [x][y] = rmg_rndm (256) > percent ? 0 : '#';
}

/////////////////////////////////////////////////////////////////////////////

// erode by cellular automata
void
layout::erode_1_2 (int c1, int c2, int repeat)
{
  layout neu (w, h);

  while (repeat--)
    {
      for (int x = 0; x < w; ++x)
        {
          coroapi::cede_to_tick ();

          for (int y = 0; y < h; ++y)
            {
              int n1 = 0, n2 = 0;

              // a 5x5 area, dx, dy, distance (1 == <= 1, 0 <= 2)
              static I8 dds[][3] = {
                               { -2, -1, 0 }, { -2,  0, 0 }, { -2,  1, 0 },
                { -1, -2, 0 }, { -1, -1, 1 }, { -1,  0, 1 }, { -1,  1, 1 }, { -1,  2, 0 },
                {  0, -2, 0 }, {  0, -1, 1 }, {  0,  0, 1 }, {  0,  1, 1 }, {  0,  2, 0 },
                {  1, -2, 0 }, {  1, -1, 1 }, {  1,  0, 1 }, {  1,  1, 1 }, {  1,  2, 0 },
                               {  2, -1, 0 }, {  2,  0, 0 }, {  2,  1, 0 },
              };

              for (int i = array_length (dds); i--; )
                {
                  int nx = x + dds [i][0];
                  int ny = y + dds [i][1];

                  if (!IN_RANGE_EXC (nx, 0, w) || !IN_RANGE_EXC (ny, 0, h) || !data [nx][ny])
                    {
                      n1 += dds [i][2];
                      n2++;
                    }
                }

              neu [x][y] = n1 >= c1 || n2 <= c2 ? '#' : 0;
            }
        }

      swap (neu);
    }
}

/////////////////////////////////////////////////////////////////////////////

void
layout::print () const
{
  for (int y = 0; y < h; y++)
    {
      for (int x = 0; x < w; x++)
        {
          U8 c = (U8)data [x][y];

          if (!c)
            c = ' ';
          else if (c < 10)
            c += '0';
          else if (c < 32)
            c += 'a' - 10;

          putc ((char)c, stdout);
        }

      putc ('\n', stdout);
    }

  putc ('\n', stdout);
}

/////////////////////////////////////////////////////////////////////////////
// isolation remover - ensures single connected area

typedef fixed_stack<point> pointlist;

static void noinline
push_flood_fill (layout &dist, pointlist &seeds, int x, int y)
{
  if (dist [x][y])
    return;

  while (y > 0 && !dist [x][y - 1])
    --y;

  int y0 = y;

  while (y < dist.h && !dist [x][y])
    {
      seeds.push (point (x, y));

      dist [x][y] = 1;
      ++y;
    }

  while (--y >= y0)
    {
      if (x >          0) push_flood_fill (dist, seeds, x - 1, y);
      if (x < dist.w - 1) push_flood_fill (dist, seeds, x + 1, y);
    }
}

static inline void
make_tunnel (layout &dist, pointlist &seeds, int x, int y, U8 d)
{
  for (;;)
    {
      point neigh[4];
      int ncnt = 0;

      if (x >          1 && U8 (dist [x - 1][y]) <= d && dist [x - 1][y] > 1) neigh [ncnt++] = point (x - 1, y);
      if (x < dist.w - 2 && U8 (dist [x + 1][y]) <= d && dist [x + 1][y] > 1) neigh [ncnt++] = point (x + 1, y);
      if (y >          1 && U8 (dist [x][y - 1]) <= d && dist [x][y - 1] > 1) neigh [ncnt++] = point (x, y - 1);
      if (y < dist.h - 2 && U8 (dist [x][y + 1]) <= d && dist [x][y + 1] > 1) neigh [ncnt++] = point (x, y + 1);

      if (!ncnt)
        return;

      point &p = neigh [rmg_rndm (ncnt)];

      seeds.push (p);

      x = p.x;
      y = p.y;

      d = dist [x][y];
      dist [x][y] = 1;
    }
}

static void inline
maybe_push (layout &dist, pointlist &seeds, int x, int y, U8 d)
{
  char &D = dist [x][y];

  if (U8 (D) > d) // if wall and higher distance, lower distance
    D = d;
  else if (D) // otherwise, if it's no room, this space is uninteresting
    return;

  seeds.push (point (x, y));
}

// isolation remover, works on a "distance" map
// the map must be initialised with 0 == rooms, 255 = walls
static void noinline
isolation_remover (layout &dist)
{
  // dist contains
  // 0 == invisited rooms
  // 1 == visited rooms
  // 2+ shortest distance to random near room

  // phase 1, find seed
  int cnt = 0;
  int x, y;

  for (int i = 0; i < dist.w; ++i)
    for (int j = 0; j < dist.h; ++j)
      if (!dist [i][j]  && !rmg_rndm (++cnt))
        x = i, y = j;

  if (!cnt)
    {
      // map is completely massive, this is not good,
      // so make it empty instead.
      dist.clear ();
      dist.border (255);
      return;
    }

  fixed_stack<point> seeds (dist.w * dist.h * 5);

  // found first free space - picking the first one gives
  // us a slight bias for tunnels, but usually you won't
  // notice that in-game
  seeds.push (point (x, y));

  // phase 2, while we have seeds, if
  // seed is empty, floodfill, else grow

  while (seeds.size)
    {
      coroapi::cede_to_tick ();

      point p = seeds.remove (rmg_rndm (seeds.size));

      x = p.x;
      y = p.y;

      if (!dist [x][y])
        {
          // found new isolated area, make tunnel
          push_flood_fill (dist, seeds, x, y);
          make_tunnel (dist, seeds, x, y, 255);
        }
      else
        {
          // nothing here, continue to expand
          U8 d = U8 (dist [x][y]) + 1;

          if (x < dist.w - 1) maybe_push (dist, seeds, x + 1, y, d);
          if (x >          0) maybe_push (dist, seeds, x - 1, y, d);
          if (y < dist.h - 1) maybe_push (dist, seeds, x, y + 1, d);
          if (y >          0) maybe_push (dist, seeds, x, y - 1, d);
        }
    }
}

void
layout::isolation_remover ()
{
  layout dist (w, h);

  for (int x = 0; x < w; ++x)
    for (int y = 0; y < h; ++y)
      dist [x][y] = data [x][y] == '#' ? U8 (255) : 0;

  ::isolation_remover (dist);

  // now copy the tunnels over
  for (int x = 0; x < w; ++x)
    for (int y = 0; y < h; ++y)
      if (data [x][y] == '#' && dist [x][y] == 1)
        data [x][y] = 0;
}

/////////////////////////////////////////////////////////////////////////////

// inspired mostly by http://www.jimrandomh.org/misc/caves.txt
void
layout::gen_cave (int subtype)
{
  switch (subtype)
    {
      // a rough cave
      case 0:
        fill_rand (rmg_rndm (85, 97));
        break;

      // corridors
      case 1:
        fill_rand (rmg_rndm (5, 40));
        erode_1_2 (5,  2, 10);
        erode_1_2 (5, -1, 10);
        erode_1_2 (5,  2, 1);
        break;

      // somewhat open, roundish
      case 2:
        fill_rand (45);
        erode_1_2 (5,  0, 5);
        erode_1_2 (5, 1, 1);
        break;

      // wide open, some room-like structures
      case 3:
        fill_rand (45);
        erode_1_2 (5,  2, 4);
        erode_1_2 (5, -1, 3);
        break;
    }

  border ();
  isolation_remover ();
}

/////////////////////////////////////////////////////////////////////////////

//+GPL

/*  puts doors at appropriate locations in a maze. */
void
layout::doorify ()
{
  int ndoors = w * h / 60;      /* reasonable number of doors. */
  int doorlocs = 0;             /* # of available doorlocations */

  uint16 *doorlist_x = salloc<uint16> (w * h);
  uint16 *doorlist_y = salloc<uint16> (w * h);

  /* make a list of possible door locations */
  for (int i = 1; i < w - 1; i++)
    for (int j = 1; j < h - 1; j++)
      {
        int sindex = surround_flag (*this, i, j);

        if (sindex == 3 || sindex == 12)        /* these are possible door sindex */
          {
            doorlist_x [doorlocs] = i;
            doorlist_y [doorlocs] = j;
            doorlocs++;
          }
      }

  while (ndoors > 0 && doorlocs > 0)
    {
      int di = rmg_rndm (doorlocs);
      int i = doorlist_x [di];
      int j = doorlist_y [di];
      int sindex = surround_flag (*this, i, j);

      if (sindex == 3 || sindex == 12)  /* these are possible door sindex */
        {
          data [i][j] = 'D';
          ndoors--;
        }

      /* reduce the size of the list */
      doorlocs--;
      doorlist_x[di] = doorlist_x [doorlocs];
      doorlist_y[di] = doorlist_y [doorlocs];
    }

  sfree (doorlist_x, w * h);
  sfree (doorlist_y, w * h);
}

/* takes a map and makes it symmetric: adjusts Xsize and
 * Ysize to produce a symmetric map.
 */
void
layout::symmetrize (int symmetry)
{
  if (symmetry == SYMMETRY_NONE)
    return;

  layout sym_layout (
    symmetry == SYMMETRY_X || symmetry == SYMMETRY_XY ? w * 2 - 3 : w,
    symmetry == SYMMETRY_Y || symmetry == SYMMETRY_XY ? h * 2 - 3 : h
  );

  if (symmetry == SYMMETRY_X)
    for (int i = 0; i < sym_layout.w / 2 + 1; i++)
      for (int j = 0; j < sym_layout.h; j++)
        {
          sym_layout[i                   ][j] =
          sym_layout[sym_layout.w - i - 1][j] = data [i][j];
        }

  if (symmetry == SYMMETRY_Y)
    for (int i = 0; i < sym_layout.w; i++)
      for (int j = 0; j < sym_layout.h / 2 + 1; j++)
        {
          sym_layout[i][j                   ] =
          sym_layout[i][sym_layout.h - j - 1] = data [i][j];
        }

  if (symmetry == SYMMETRY_XY)
    for (int i = 0; i < sym_layout.w / 2 + 1; i++)
      for (int j = 0; j < sym_layout.h / 2 + 1; j++)
        {
          sym_layout[i                   ][j                   ] =
          sym_layout[i                   ][sym_layout.h - j - 1] =
          sym_layout[sym_layout.w - i - 1][j                   ] =
          sym_layout[sym_layout.w - i - 1][sym_layout.h - j - 1] = data [i][j];
        }

  /* need to run the isolation remover for some layouts */
#if 0
  switch (RP->map_layout_style)
    {
      case LAYOUT_ONION:
      case LAYOUT_SNAKE:
      case LAYOUT_SQUARE_SPIRAL:
        // safe
        break;

      default:
        sym_layout.isolation_remover ();
        break;
    }
#endif
  sym_layout.isolation_remover ();

  swap (sym_layout);
}

//-GPL

void
layout::rotate (int rotation)
{
  switch (rotation & 3)
    {
      case 2:                  /* a reflection */
        {
          layout new_layout (w, h);

          for (int i = 0; i < w; i++)                   /* copy a reflection back */
            for (int j = 0; j < h; j++)
              new_layout [i][j] = data [w - i - 1][h - j - 1];

          swap (new_layout);
        }
        break;

      case 1:
      case 3:
        {
          layout new_layout (h, w);

          if (rotation == 1)    /* swap x and y */
            for (int i = 0; i < w; i++)
              for (int j = 0; j < h; j++)
                new_layout [j][i] = data [i][j];

          if (rotation == 3) /* swap x and y */
            for (int i = 0; i < w; i++)
              for (int j = 0; j < h; j++)
                new_layout [j][i] = data [w - i - 1][h - j - 1];

          swap (new_layout);
        }
        break;
    }
}

/////////////////////////////////////////////////////////////////////////////

//+GPL

/*
 * Expands a maze by 2x in each dimension.
 * H. S. Teoh
 */

/* Copy the old tile X into the new one at location (i*2, j*2) and
 * fill up the rest of the 2x2 result with \0:
 *      X  ---> X  \0
 *              \0 \0
 */
static void inline
expand_misc (layout &newlayout, int i, int j, layout &maze)
{
  newlayout[i * 2 + rmg_rndm (1)][j * 2 + rmg_rndm (1)] = maze[i][j];
  /* (Note: no need to reset rest of 2x2 area to \0 because calloc does that
   * for us.) */
}

/* Returns a bitmap that represents which squares on the right and bottom
 * edges of a square (i,j) match the given character:
 *      1       match on (i+1, j)
 *      2       match on (i, j+1)
 *      4       match on (i+1, j+1)
 * and the possible combinations thereof.
 */
static int noinline
calc_pattern (char ch, layout &maze, int i, int j)
{
  int pattern = 0;

  if (i + 1 < maze.w && maze[i + 1][j] == ch)
    pattern |= 1;

  if (j + 1 < maze.h)
    {
      if (maze[i][j + 1] == ch)
        pattern |= 2;

      if (i + 1 < maze.w && maze[i + 1][j + 1] == ch)
        pattern |= 4;
    }

  return pattern;
}

/* Expand a wall. This function will try to sensibly connect the resulting
 * wall to adjacent wall squares, so that the result won't have disconnected
 * walls.
 */
static void inline
expand_wall (layout &newlayout, int i, int j, layout &maze)
{
  int wall_pattern = calc_pattern ('#', maze, i, j);
  int door_pattern = calc_pattern ('D', maze, i, j);
  int both_pattern = wall_pattern | door_pattern;

  newlayout[i * 2][j * 2] = '#';

  if (i + 1 < maze.w)
    {
      if (both_pattern & 1)
        {                       /* join walls/doors to the right */
/*      newlayout[i*2+1][j*2] = '#'; */
          newlayout[i * 2 + 1][j * 2] = maze[i + 1][j];
        }
    }

  if (j + 1 < maze.h)
    {
      if (both_pattern & 2)
        {                       /* join walls/doors to the bottom */
/*      newlayout[i*2][j*2+1] = '#'; */
          newlayout[i * 2][j * 2 + 1] = maze[i][j + 1];
        }

      if (wall_pattern == 7)
        {                       /* if orig maze is a 2x2 wall block,
                                 * we fill the result with walls. */
          newlayout[i * 2 + 1][j * 2 + 1] = '#';
        }
    }
}

/* This function will try to sensibly connect doors so that they meet up with
 * adjacent walls. Note that it will also presumptuously delete (ignore) doors
 * that it doesn't know how to correctly expand.
 */
static void inline
expand_door (layout &newlayout, int i, int j, layout &maze)
{
  int wall_pattern = calc_pattern ('#', maze, i, j);
  int door_pattern = calc_pattern ('D', maze, i, j);
  int join_pattern;

  /* Doors "like" to connect to walls more than other doors. If there is
   * a wall and another door, this door will connect to the wall and
   * disconnect from the other door. */
  if (wall_pattern & 3)
    join_pattern = wall_pattern;
  else
    join_pattern = door_pattern;

  newlayout[i * 2][j * 2] = 'D';

  if (i + 1 < maze.w)
    if (join_pattern & 1)
      /* there is a door/wall to the right */
      newlayout[i * 2 + 1][j * 2] = 'D';

  if (j + 1 < maze.h)
    if (join_pattern & 2)
      /* there is a door/wall below */
      newlayout[i * 2][j * 2 + 1] = 'D';
}

void
layout::expand2x ()
{
  layout new_layout (w * 2 - 1, h * 2 - 1);

  new_layout.clear ();

  for (int i = 0; i < w; i++)
    for (int j = 0; j < h; j++)
      switch (data [i][j])
        {
          case '#': expand_wall (new_layout, i, j, *this); break; 
          case 'D': expand_door (new_layout, i, j, *this); break; 
          default:  expand_misc (new_layout, i, j, *this); break;
        }

  swap (new_layout);
}

/////////////////////////////////////////////////////////////////////////////

/*  checks the maze to see if I can stick a horizontal(dir = 0) wall
    (or vertical, dir == 1)
    here which ends up on other walls sensibly.  */
static int
can_make_wall (const layout &maze, int dx, int dy, int dir)
{
  int i1;
  int length = 0;

  /* dont make walls if we're on the edge. */
  if (dx == 0 || dx == (maze.w - 1) || dy == 0 || dy == (maze.h - 1))
    return -1;

  /* don't make walls if we're ON a wall. */
  if (maze [dx][dy] != 0)
    return -1;

  if (dir == 0)                 /* horizontal */
    {
      int y = dy;

      for (i1 = dx - 1; i1 > 0; i1--)
        {
          int sindex = surround_flag2 (maze, i1, y);

          if (sindex == 1) break;
          if (sindex != 0) return -1;          /* can't make horiz.  wall here */
          if (maze[i1][y] != 0) return -1;     /* can't make horiz.  wall here */

          length++;
        }

      for (i1 = dx + 1; i1 < maze.w - 1; i1++)
        {
          int sindex = surround_flag2 (maze, i1, y);

          if (sindex == 2) break;
          if (sindex != 0) return -1;          /* can't make horiz.  wall here */
          if (maze[i1][y] != 0) return -1;     /* can't make horiz.  wall here */

          length++;
        }
      return length;
    }
  else
    {                           /* vertical */
      int x = dx;

      for (i1 = dy - 1; i1 > 0; i1--)
        {
          int sindex = surround_flag2 (maze, x, i1);

          if (sindex == 4) break;
          if (sindex != 0) return -1;          /* can't make vert. wall here */
          if (maze[x][i1] != 0) return -1;     /* can't make horiz.  wall here */

          length++;
        }

      for (i1 = dy + 1; i1 < maze.h - 1; i1++)
        {
          int sindex = surround_flag2 (maze, x, i1);

          if (sindex == 8) break;
          if (sindex != 0) return -1;          /* can't make verti. wall here */
          if (maze[x][i1] != 0) return -1;     /* can't make horiz.  wall here */

          length++;
        }

      return length;
    }

  return -1;
}

int
make_wall (char **maze, int x, int y, int dir)
{
  maze[x][y] = 'D';             /* mark a door */

  switch (dir)
    {
      case 0:                  /* horizontal */
        {
          for (int i1 = x - 1; maze[i1][y] == 0; --i1) maze[i1][y] = '#';
          for (int i1 = x + 1; maze[i1][y] == 0; ++i1) maze[i1][y] = '#';
          break;
        }
      case 1:                  /* vertical */
        {
          for (int i1 = y - 1; maze[x][i1] == 0; --i1) maze[x][i1] = '#';
          for (int i1 = y + 1; maze[x][i1] == 0; ++i1) maze[x][i1] = '#';
          break;
        }
    }

  return 0;
}

void
layout::roomify ()
{
  int tries = w * h / 30;

  for (int ti = 0; ti < tries; ti++)
    {
      /* starting location for looking at creating a door */
      int dx = rmg_rndm (w);
      int dy = rmg_rndm (h);

      /* results of checking on creating walls. */
      int cx = can_make_wall (*this, dx, dy, 0); /* horizontal */
      int cy = can_make_wall (*this, dx, dy, 1); /* vertical */

      if (cx == -1)
        {
          if (cy != -1)
            make_wall (*this, dx, dy, 1);

          continue;
        }

      if (cy == -1)
        {
          make_wall (*this, dx, dy, 0);
          continue;
        }

      if (cx < cy)
        make_wall (*this, dx, dy, 0);
      else
        make_wall (*this, dx, dy, 1);
    }
}

/////////////////////////////////////////////////////////////////////////////

/*  function selects the maze function and gives it whatever
    arguments it needs.  */
void
layout::generate (random_map_params *RP)
{
  switch (RP->map_layout_style)
    {
      case LAYOUT_ONION:
        map_gen_onion (*this, RP->layoutoptions1, RP->layoutoptions2);

        if (!(rmg_rndm (3)) && !(RP->layoutoptions1 & (RMOPT_WALLS_ONLY | RMOPT_WALL_OFF)))
          roomify ();

        break;

      case LAYOUT_MAZE:
        maze_gen (*this, RP->get_iv ("maze_type", rmg_rndm (4)));

        if (rmg_rndm (2))
          doorify ();

        break;

      case LAYOUT_SPIRAL:
        map_gen_spiral (*this, RP->layoutoptions1);

        if (rmg_rndm (2))
          doorify ();

        break;

      case LAYOUT_ROGUELIKE:
        /* Don't put symmetry in rogue maps.  There isn't much reason to
         * do so in the first place (doesn't make it any more interesting),
         * but more importantly, the symmetry code presumes we are symmetrizing
         * spirals, or maps with lots of passages - making a symmetric rogue
         * map fails because its likely that the passages the symmetry process
         * creates may not connect the rooms.
         */
        RP->symmetry_used = SYMMETRY_NONE;
        roguelike_layout_gen (*this, RP->layoutoptions1);
        /* no doorifying...  done already */
        break;

      case LAYOUT_SNAKE:
        make_snake_layout (*this, RP->layoutoptions1);

        if (rmg_rndm (2))
          roomify ();

        break;

      case LAYOUT_SQUARE_SPIRAL:
        make_square_spiral_layout (*this, RP->layoutoptions1);

        if (rmg_rndm (2))
          roomify ();

        break;

      case LAYOUT_CAVE:
        gen_cave (RP->get_iv ("cave_type", rmg_rndm (4)));

        if (rmg_rndm (2))
          doorify ();

        break;

      default:
        abort ();
    }

  /*  rotate the maze randomly */
  rotate (rmg_rndm (4));

  symmetrize (RP->symmetry_used);

#if 0
  print ();//D
#endif

  if (RP->expand2x)
    expand2x ();
}

//-GPL

#if 0
static struct demo
{
  demo ()
  {
    rmg_rndm.seed (time (0));

    for(int i=1;i<100;i++)
      {
        layout maze (40, 25);
        maze.fill_rand (85);
        maze.border ();
        maze.isolation_remover ();
        maze.print ();
      }

    exit (1);
  }
} demo;
#endif
Revision:	1.10
Committed:	Sat Jul 3 00:39:57 2010 UTC (13 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+60 -48 lines
Log Message:	much more random pathing for isolation remover