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
 * 
 * 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>

Layout::Layout (int w, int h)
: w(w), h(h)
{
  int size = (sizeof (char *) + sizeof (char) * h) * w;

  col = (char **)salloc<char> (size);

  char *data = (char *)(col + w);

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

Layout::~Layout ()
{
  int size = (sizeof (char *) + sizeof (char) * h) * w;

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

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

void
Layout::rect (int x1, int y1, int x2, int y2, char fill)
{
  for (; x1 < x2; ++x1)
    memset (col [x1] + y1, fill, y2 - y1);
}

void Layout::border (char fill)
{
  for (int i = 0; i < w; i++) col [i][0] = col [i][h - 1] = fill;
  for (int j = 0; j < h; j++) col [0][j] = col [w - 1][j] = 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; )
      col [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) || !col [nx][ny])
                    {
                      n1 += dds [i][2];
                      n2++;
                    }
                }

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

      swap (neu);
    }
}

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

void
Layout::print ()
{
  for (int y = 0; y < h; y++)
    {
      for (int x = 0; x < w; x++)
        {
          U8 c = (U8)col [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 noinline void
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 (;;)
    {
      if (x >               1 && U8 (dist [x - 1][y]) < d && dist [x - 1][y] > 1)
        --x;
      else if (x < dist.w - 2 && U8 (dist [x + 1][y]) < d && dist [x + 1][y] > 1)
        ++x;
      else if (y >          1 && U8 (dist [x][y - 1]) < d && dist [x][y - 1] > 1)
        --y;
      else if (y < dist.h - 2 && U8 (dist [x][y + 1]) < d && dist [x][y + 1] > 1)
        ++y;
      else
        break;

      d = dist [x][y];
      dist [x][y] = 1;
      seeds.push (point (x, y));
    }
}

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));
}

static void
isolation_remover (Layout &maze, bool dirty)
{
  Layout dist (maze.w, maze.h);

  // dist contains
  // 0 == invisited rooms
  // 1 == visited rooms
  // 2+ shortest distance to random near room

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

  for (int i = 0; i < maze.w; ++i)
    for (int j = 0; j < maze.h; ++j)
      {
        if (maze [i][j] == '#')
          dist [i][j] = U8 (255);
        else
          {
            dist [i][j] = 0;
            if (!rmg_rndm (++cnt))
              x = i, y = j;
          }
      }

  if (!cnt)
    return;

  fixed_stack<point> seeds (maze.w * maze.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
          if (!dirty)
            push_flood_fill (dist, seeds, x, y);

          make_tunnel (dist, seeds, x, y, 255);

          if (dirty)
            push_flood_fill (dist, seeds, x, y);
        }
      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);
        }
    }

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

void
Layout::isolation_remover (bool dirty)
{
  ::isolation_remover (*this, dirty);
}

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

// 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 (80, 95));
        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 ();
}

#if 0
static struct demo
{
  demo ()
  {
    Layout maze (40, 25);
    rmg_rndm.seed (time (0));

    for(int i=1;i<10;i)
      {
        maze.fill_rand (97);
        maze.border ();
        maze.isolation_remover ();
        maze.print ();
      }

    exit (1);
  }
} demo;
#endif
Revision:	1.3
Committed:	Thu Jul 1 01:22:44 2010 UTC (16 years, 3 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+94 -88 lines
Log Message:	got rid of Layout, better memory management etc.
#	User	Rev	Content
1	root	1.1	/*
2			* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3			*
4			* Copyright (©) 2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5			*
6			* Deliantra is free software: you can redistribute it and/or modify it under
7			* the terms of the Affero GNU General Public License as published by the
8			* Free Software Foundation, either version 3 of the License, or (at your
9			* option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the Affero GNU General Public License
17			* and the GNU General Public License along with this program. If not, see
18			* <http://www.gnu.org/licenses/>.
19			*
20			* The authors can be reached via e-mail to <support@deliantra.net>
21			*/
22
23			#include <global.h>
24			#include <random_map.h>
25
26	root	1.3	Layout::Layout (int w, int h)
27	root	1.1	: w(w), h(h)
28			{
29			int size = (sizeof (char ) + sizeof (char) h) * w;
30
31			col = (char **)salloc<char> (size);
32
33			char data = (char )(col + w);
34
35			for (int x = w; x--; )
36			col [x] = data + x * h;
37			}
38
39	root	1.3	Layout::~Layout ()
40	root	1.1	{
41			int size = (sizeof (char ) + sizeof (char) h) * w;
42
43			sfree ((char *)col, size);
44			}
45
46			void
47	root	1.3	Layout::fill (char fill)
48	root	1.1	{
49			memset (col [0], fill, w * h);
50			}
51
52			void
53	root	1.3	Layout::rect (int x1, int y1, int x2, int y2, char fill)
54	root	1.1	{
55			for (; x1 < x2; ++x1)
56			memset (col [x1] + y1, fill, y2 - y1);
57			}
58
59	root	1.3	void Layout::border (char fill)
60	root	1.1	{
61			for (int i = 0; i < w; i++) col [i][0] = col [i][h - 1] = fill;
62			for (int j = 0; j < h; j++) col [0][j] = col [w - 1][j] = fill;
63			}
64
65	root	1.2	void
66	root	1.3	Layout::fill_rand (int percent)
67	root	1.2	{
68			percent = lerp (percent, 0, 100, 0, 256);
69
70			for (int x = w - 1; --x > 0; )
71			for (int y = h - 1; --y > 0; )
72			col [x][y] = rmg_rndm (256) > percent ? 0 : '#';
73			}
74
75	root	1.1	/////////////////////////////////////////////////////////////////////////////
76
77	root	1.2	// erode by cellular automata
78	root	1.1	void
79	root	1.3	Layout::erode_1_2 (int c1, int c2, int repeat)
80	root	1.1	{
81	root	1.3	Layout neu (w, h);
82	root	1.2
83			while (repeat--)
84	root	1.1	{
85	root	1.2	for (int x = 0; x < w; ++x)
86	root	1.1	{
87	root	1.2	coroapi::cede_to_tick ();
88
89			for (int y = 0; y < h; ++y)
90			{
91			int n1 = 0, n2 = 0;
92
93			// a 5x5 area, dx, dy, distance (1 == <= 1, 0 <= 2)
94			static I8 dds[][3] = {
95			{ -2, -1, 0 },
96			{ -2, 0, 0 },
97			{ -2, 1, 0 },
98
99			{ -1, -2, 0 },
100			{ -1, -1, 1 },
101			{ -1, 0, 1 },
102			{ -1, 1, 1 },
103			{ -1, 2, 0 },
104
105			{ 0, -2, 0 },
106			{ 0, -1, 1 },
107			{ 0, 0, 1 },
108			{ 0, 1, 1 },
109			{ 0, 2, 0 },
110
111			{ 1, -2, 0 },
112			{ 1, -1, 1 },
113			{ 1, 0, 1 },
114			{ 1, 1, 1 },
115			{ 1, 2, 0 },
116
117			{ 2, -1, 0 },
118			{ 2, 0, 0 },
119			{ 2, 1, 0 },
120			};
121
122			for (int i = array_length (dds); i--; )
123			{
124			int nx = x + dds [i][0];
125			int ny = y + dds [i][1];
126
127			if (!IN_RANGE_EXC (nx, 0, w) \|\| !IN_RANGE_EXC (ny, 0, h) \|\| !col [nx][ny])
128			{
129			n1 += dds [i][2];
130			n2++;
131			}
132			}
133
134			neu [x][y] = n1 >= c1 \|\| n2 <= c2 ? '#' : 0;
135			}
136			}
137
138			swap (neu);
139			}
140			}
141
142			/////////////////////////////////////////////////////////////////////////////
143
144			void
145	root	1.3	Layout::print ()
146	root	1.2	{
147			for (int y = 0; y < h; y++)
148			{
149			for (int x = 0; x < w; x++)
150			{
151			U8 c = (U8)col [x][y];
152	root	1.1
153			if (!c)
154			c = ' ';
155			else if (c < 10)
156			c += '0';
157			else if (c < 32)
158			c += 'a' - 10;
159
160			putc ((char)c, stdout);
161			}
162
163			putc ('\n', stdout);
164			}
165
166			putc ('\n', stdout);
167			}
168
169			/////////////////////////////////////////////////////////////////////////////
170			// isolation remover - ensures single connected area
171
172			typedef fixed_stack<point> pointlist;
173
174			static noinline void
175	root	1.3	push_flood_fill (Layout &dist, pointlist &seeds, int x, int y)
176	root	1.1	{
177	root	1.3	if (dist [x][y])
178	root	1.1	return;
179
180	root	1.3	while (y > 0 && !dist [x][y - 1])
181	root	1.1	--y;
182
183			int y0 = y;
184
185	root	1.3	while (y < dist.h && !dist [x][y])
186	root	1.1	{
187			seeds.push (point (x, y));
188
189			dist [x][y] = 1;
190			++y;
191			}
192
193			while (--y >= y0)
194			{
195	root	1.3	if (x > 0) push_flood_fill (dist, seeds, x - 1, y);
196			if (x < dist.w - 1) push_flood_fill (dist, seeds, x + 1, y);
197	root	1.1	}
198			}
199
200			static inline void
201	root	1.3	make_tunnel (Layout &dist, pointlist &seeds, int x, int y, U8 d)
202	root	1.1	{
203			for (;;)
204			{
205	root	1.2	if (x > 1 && U8 (dist [x - 1][y]) < d && dist [x - 1][y] > 1)
206	root	1.1	--x;
207	root	1.3	else if (x < dist.w - 2 && U8 (dist [x + 1][y]) < d && dist [x + 1][y] > 1)
208	root	1.1	++x;
209	root	1.2	else if (y > 1 && U8 (dist [x][y - 1]) < d && dist [x][y - 1] > 1)
210	root	1.1	--y;
211	root	1.3	else if (y < dist.h - 2 && U8 (dist [x][y + 1]) < d && dist [x][y + 1] > 1)
212	root	1.1	++y;
213			else
214			break;
215
216			d = dist [x][y];
217	root	1.3	dist [x][y] = 1;
218			seeds.push (point (x, y));
219	root	1.1	}
220			}
221
222	root	1.3	static void inline
223			maybe_push (Layout &dist, pointlist &seeds, int x, int y, U8 d)
224	root	1.1	{
225	root	1.3	char &D = dist [x][y];
226
227			if (U8 (D) > d) // if wall and higher distance, lower distance
228			D = d;
229			else if (D) // otherwise, if it's no room, this space is uninteresting
230			return;
231	root	1.1
232	root	1.3	seeds.push (point (x, y));
233			}
234	root	1.1
235	root	1.3	static void
236			isolation_remover (Layout &maze, bool dirty)
237			{
238			Layout dist (maze.w, maze.h);
239	root	1.1
240	root	1.3	// dist contains
241			// 0 == invisited rooms
242			// 1 == visited rooms
243			// 2+ shortest distance to random near room
244	root	1.1
245	root	1.3	// phase 1, initialise dist array, find seed
246			int cnt = 0;
247			int x, y;
248	root	1.1
249	root	1.3	for (int i = 0; i < maze.w; ++i)
250			for (int j = 0; j < maze.h; ++j)
251			{
252			if (maze [i][j] == '#')
253			dist [i][j] = U8 (255);
254			else
255			{
256			dist [i][j] = 0;
257			if (!rmg_rndm (++cnt))
258			x = i, y = j;
259			}
260			}
261	root	1.2
262	root	1.3	if (!cnt)
263			return;
264	root	1.1
265	root	1.3	fixed_stack<point> seeds (maze.w * maze.h * 5);
266	root	1.1
267	root	1.3	// found first free space - picking the first one gives
268			// us a slight bias for tunnels, but usually you won't
269			// notice that in-game
270			seeds.push (point (x, y));
271	root	1.1
272	root	1.3	// phase 2, while we have seeds, if
273			// seed is empty, floodfill, else grow
274	root	1.1
275	root	1.3	while (seeds.size)
276			{
277			coroapi::cede_to_tick ();
278	root	1.1
279	root	1.3	point p = seeds.remove (rmg_rndm (seeds.size));
280	root	1.1
281	root	1.3	x = p.x;
282			y = p.y;
283	root	1.1
284	root	1.3	if (!dist [x][y])
285			{
286			// found new isolated area, make tunnel
287			if (!dirty)
288			push_flood_fill (dist, seeds, x, y);
289	root	1.1
290	root	1.3	make_tunnel (dist, seeds, x, y, 255);
291	root	1.1
292	root	1.3	if (dirty)
293			push_flood_fill (dist, seeds, x, y);
294	root	1.1	}
295	root	1.3	else
296			{
297			// nothing here, continue to expand
298			U8 d = U8 (dist [x][y]) + 1;
299	root	1.1
300	root	1.3	if (x < dist.w - 1) maybe_push (dist, seeds, x + 1, y, d);
301			if (x > 0) maybe_push (dist, seeds, x - 1, y, d);
302			if (y < dist.h - 1) maybe_push (dist, seeds, x, y + 1, d);
303			if (y > 0) maybe_push (dist, seeds, x, y - 1, d);
304			}
305			}
306	root	1.1
307	root	1.3	// now copy the tunnels over
308	root	1.2	for (int x = 0; x < maze.w; ++x)
309			for (int y = 0; y < maze.h; ++y)
310	root	1.3	if (maze [x][y] == '#' && dist [x][y] == 1)
311	root	1.1	maze [x][y] = 0;
312			}
313
314			void
315	root	1.3	Layout::isolation_remover (bool dirty)
316	root	1.1	{
317	root	1.2	::isolation_remover (*this, dirty);
318			}
319
320			/////////////////////////////////////////////////////////////////////////////
321
322			// inspired mostly by http://www.jimrandomh.org/misc/caves.txt
323			void
324	root	1.3	Layout::gen_cave (int subtype)
325	root	1.2	{
326			switch (subtype)
327			{
328			// a rough cave
329			case 0:
330			fill_rand (rmg_rndm (80, 95));
331			break;
332
333			// corridors
334			case 1:
335			fill_rand (rmg_rndm (5, 40));
336			erode_1_2 (5, 2, 10);
337			erode_1_2 (5, -1, 10);
338			erode_1_2 (5, 2, 1);
339			break;
340
341			// somewhat open, roundish
342			case 2:
343			fill_rand (45);
344			erode_1_2 (5, 0, 5);
345			erode_1_2 (5, 1, 1);
346			break;
347
348			// wide open, some room-like structures
349			case 3:
350			fill_rand (45);
351			erode_1_2 (5, 2, 4);
352			erode_1_2 (5, -1, 3);
353			break;
354			}
355
356			border ();
357			isolation_remover ();
358	root	1.1	}
359
360			#if 0
361			static struct demo
362			{
363			demo ()
364			{
365			Layout maze (40, 25);
366			rmg_rndm.seed (time (0));
367
368			for(int i=1;i<10;i)
369			{
370	root	1.3	maze.fill_rand (97);
371			maze.border ();
372			maze.isolation_remover ();
373			maze.print ();
374	root	1.1	}
375	root	1.2
376	root	1.1	exit (1);
377			}
378			} demo;
379			#endif