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1 /*
2 Minetest
3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
4 Copyright (C) 2010-2015 celeron55, Perttu Ahola <celeron55@gmail.com>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your 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 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21 #include "mapgen.h"
22 #include "voxel.h"
23 #include "noise.h"
24 #include "gamedef.h"
25 #include "mg_biome.h"
26 #include "mapblock.h"
27 #include "mapnode.h"
28 #include "map.h"
29 #include "content_sao.h"
30 #include "nodedef.h"
31 #include "emerge.h"
32 #include "voxelalgorithms.h"
33 #include "porting.h"
34 #include "profiler.h"
35 #include "settings.h"
36 #include "treegen.h"
37 #include "serialization.h"
38 #include "util/serialize.h"
39 #include "util/numeric.h"
40 #include "filesys.h"
41 #include "log.h"
42
43 FlagDesc flagdesc_mapgen[] = {
44         {"trees",       MG_TREES},
45         {"caves",       MG_CAVES},
46         {"dungeons",    MG_DUNGEONS},
47         {"flat",        MG_FLAT},
48         {"light",       MG_LIGHT},
49         {"decorations", MG_DECORATIONS},
50         {NULL,       0}
51 };
52
53 FlagDesc flagdesc_gennotify[] = {
54         {"dungeon",          1 << GENNOTIFY_DUNGEON},
55         {"temple",           1 << GENNOTIFY_TEMPLE},
56         {"cave_begin",       1 << GENNOTIFY_CAVE_BEGIN},
57         {"cave_end",         1 << GENNOTIFY_CAVE_END},
58         {"large_cave_begin", 1 << GENNOTIFY_LARGECAVE_BEGIN},
59         {"large_cave_end",   1 << GENNOTIFY_LARGECAVE_END},
60         {"decoration",       1 << GENNOTIFY_DECORATION},
61         {NULL,               0}
62 };
63
64
65 ////
66 //// Mapgen
67 ////
68
69 Mapgen::Mapgen()
70 {
71         generating  = false;
72         id          = -1;
73         seed        = 0;
74         water_level = 0;
75         flags       = 0;
76
77         vm        = NULL;
78         ndef      = NULL;
79         heightmap = NULL;
80         biomemap  = NULL;
81         heatmap   = NULL;
82         humidmap  = NULL;
83 }
84
85
86 Mapgen::Mapgen(int mapgenid, MapgenParams *params, EmergeManager *emerge) :
87         gennotify(emerge->gen_notify_on, &emerge->gen_notify_on_deco_ids)
88 {
89         generating  = false;
90         id          = mapgenid;
91         seed        = (int)params->seed;
92         water_level = params->water_level;
93         flags       = params->flags;
94         csize       = v3s16(1, 1, 1) * (params->chunksize * MAP_BLOCKSIZE);
95
96         vm        = NULL;
97         ndef      = NULL;
98         heightmap = NULL;
99         biomemap  = NULL;
100         heatmap   = NULL;
101         humidmap  = NULL;
102 }
103
104
105 Mapgen::~Mapgen()
106 {
107 }
108
109
110 u32 Mapgen::getBlockSeed(v3s16 p, int seed)
111 {
112         return (u32)seed   +
113                 p.Z * 38134234 +
114                 p.Y * 42123    +
115                 p.X * 23;
116 }
117
118
119 u32 Mapgen::getBlockSeed2(v3s16 p, int seed)
120 {
121         u32 n = 1619 * p.X + 31337 * p.Y + 52591 * p.Z + 1013 * seed;
122         n = (n >> 13) ^ n;
123         return (n * (n * n * 60493 + 19990303) + 1376312589);
124 }
125
126
127 // Returns Y one under area minimum if not found
128 s16 Mapgen::findGroundLevelFull(v2s16 p2d)
129 {
130         v3s16 em = vm->m_area.getExtent();
131         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
132         s16 y_nodes_min = vm->m_area.MinEdge.Y;
133         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
134         s16 y;
135
136         for (y = y_nodes_max; y >= y_nodes_min; y--) {
137                 MapNode &n = vm->m_data[i];
138                 if (ndef->get(n).walkable)
139                         break;
140
141                 vm->m_area.add_y(em, i, -1);
142         }
143         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
144 }
145
146
147 // Returns -MAX_MAP_GENERATION_LIMIT if not found
148 s16 Mapgen::findGroundLevel(v2s16 p2d, s16 ymin, s16 ymax)
149 {
150         v3s16 em = vm->m_area.getExtent();
151         u32 i = vm->m_area.index(p2d.X, ymax, p2d.Y);
152         s16 y;
153
154         for (y = ymax; y >= ymin; y--) {
155                 MapNode &n = vm->m_data[i];
156                 if (ndef->get(n).walkable)
157                         break;
158
159                 vm->m_area.add_y(em, i, -1);
160         }
161         return (y >= ymin) ? y : -MAX_MAP_GENERATION_LIMIT;
162 }
163
164
165 // Returns -MAX_MAP_GENERATION_LIMIT if not found or if ground is found first
166 s16 Mapgen::findLiquidSurface(v2s16 p2d, s16 ymin, s16 ymax)
167 {
168         v3s16 em = vm->m_area.getExtent();
169         u32 i = vm->m_area.index(p2d.X, ymax, p2d.Y);
170         s16 y;
171
172         for (y = ymax; y >= ymin; y--) {
173                 MapNode &n = vm->m_data[i];
174                 if (ndef->get(n).walkable)
175                         return -MAX_MAP_GENERATION_LIMIT;
176                 else if (ndef->get(n).isLiquid())
177                         break;
178
179                 vm->m_area.add_y(em, i, -1);
180         }
181         return (y >= ymin) ? y : -MAX_MAP_GENERATION_LIMIT;
182 }
183
184
185 void Mapgen::updateHeightmap(v3s16 nmin, v3s16 nmax)
186 {
187         if (!heightmap)
188                 return;
189
190         //TimeTaker t("Mapgen::updateHeightmap", NULL, PRECISION_MICRO);
191         int index = 0;
192         for (s16 z = nmin.Z; z <= nmax.Z; z++) {
193                 for (s16 x = nmin.X; x <= nmax.X; x++, index++) {
194                         s16 y = findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
195
196                         heightmap[index] = y;
197                 }
198         }
199         //printf("updateHeightmap: %dus\n", t.stop());
200 }
201
202
203 void Mapgen::updateLiquid(UniqueQueue<v3s16> *trans_liquid, v3s16 nmin, v3s16 nmax)
204 {
205         bool isliquid, wasliquid;
206         v3s16 em  = vm->m_area.getExtent();
207
208         for (s16 z = nmin.Z; z <= nmax.Z; z++) {
209                 for (s16 x = nmin.X; x <= nmax.X; x++) {
210                         wasliquid = true;
211
212                         u32 i = vm->m_area.index(x, nmax.Y, z);
213                         for (s16 y = nmax.Y; y >= nmin.Y; y--) {
214                                 isliquid = ndef->get(vm->m_data[i]).isLiquid();
215
216                                 // there was a change between liquid and nonliquid, add to queue.
217                                 if (isliquid != wasliquid)
218                                         trans_liquid->push_back(v3s16(x, y, z));
219
220                                 wasliquid = isliquid;
221                                 vm->m_area.add_y(em, i, -1);
222                         }
223                 }
224         }
225 }
226
227
228 void Mapgen::setLighting(u8 light, v3s16 nmin, v3s16 nmax)
229 {
230         ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update", SPT_AVG);
231         VoxelArea a(nmin, nmax);
232
233         for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
234                 for (int y = a.MinEdge.Y; y <= a.MaxEdge.Y; y++) {
235                         u32 i = vm->m_area.index(a.MinEdge.X, y, z);
236                         for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++, i++)
237                                 vm->m_data[i].param1 = light;
238                 }
239         }
240 }
241
242
243 void Mapgen::lightSpread(VoxelArea &a, v3s16 p, u8 light)
244 {
245         if (light <= 1 || !a.contains(p))
246                 return;
247
248         u32 vi = vm->m_area.index(p);
249         MapNode &nn = vm->m_data[vi];
250
251         light--;
252         // should probably compare masked, but doesn't seem to make a difference
253         if (light <= nn.param1 || !ndef->get(nn).light_propagates)
254                 return;
255
256         nn.param1 = light;
257
258         lightSpread(a, p + v3s16(0, 0, 1), light);
259         lightSpread(a, p + v3s16(0, 1, 0), light);
260         lightSpread(a, p + v3s16(1, 0, 0), light);
261         lightSpread(a, p - v3s16(0, 0, 1), light);
262         lightSpread(a, p - v3s16(0, 1, 0), light);
263         lightSpread(a, p - v3s16(1, 0, 0), light);
264 }
265
266
267 void Mapgen::calcLighting(v3s16 nmin, v3s16 nmax, v3s16 full_nmin, v3s16 full_nmax,
268         bool propagate_shadow)
269 {
270         ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update", SPT_AVG);
271         //TimeTaker t("updateLighting");
272
273         propagateSunlight(nmin, nmax, propagate_shadow);
274         spreadLight(full_nmin, full_nmax);
275
276         //printf("updateLighting: %dms\n", t.stop());
277 }
278
279
280 void Mapgen::propagateSunlight(v3s16 nmin, v3s16 nmax, bool propagate_shadow)
281 {
282         //TimeTaker t("propagateSunlight");
283         VoxelArea a(nmin, nmax);
284         bool block_is_underground = (water_level >= nmax.Y);
285         v3s16 em = vm->m_area.getExtent();
286
287         for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
288                 for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++) {
289                         // see if we can get a light value from the overtop
290                         u32 i = vm->m_area.index(x, a.MaxEdge.Y + 1, z);
291                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
292                                 if (block_is_underground)
293                                         continue;
294                         } else if ((vm->m_data[i].param1 & 0x0F) != LIGHT_SUN &&
295                                         propagate_shadow) {
296                                 continue;
297                         }
298                         vm->m_area.add_y(em, i, -1);
299
300                         for (int y = a.MaxEdge.Y; y >= a.MinEdge.Y; y--) {
301                                 MapNode &n = vm->m_data[i];
302                                 if (!ndef->get(n).sunlight_propagates)
303                                         break;
304                                 n.param1 = LIGHT_SUN;
305                                 vm->m_area.add_y(em, i, -1);
306                         }
307                 }
308         }
309         //printf("propagateSunlight: %dms\n", t.stop());
310 }
311
312
313 void Mapgen::spreadLight(v3s16 nmin, v3s16 nmax)
314 {
315         //TimeTaker t("spreadLight");
316         VoxelArea a(nmin, nmax);
317
318         for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
319                 for (int y = a.MinEdge.Y; y <= a.MaxEdge.Y; y++) {
320                         u32 i = vm->m_area.index(a.MinEdge.X, y, z);
321                         for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++, i++) {
322                                 MapNode &n = vm->m_data[i];
323                                 if (n.getContent() == CONTENT_IGNORE ||
324                                         !ndef->get(n).light_propagates)
325                                         continue;
326
327                                 u8 light_produced = ndef->get(n).light_source & 0x0F;
328                                 if (light_produced)
329                                         n.param1 = light_produced;
330
331                                 u8 light = n.param1 & 0x0F;
332                                 if (light) {
333                                         lightSpread(a, v3s16(x,     y,     z + 1), light);
334                                         lightSpread(a, v3s16(x,     y + 1, z    ), light);
335                                         lightSpread(a, v3s16(x + 1, y,     z    ), light);
336                                         lightSpread(a, v3s16(x,     y,     z - 1), light);
337                                         lightSpread(a, v3s16(x,     y - 1, z    ), light);
338                                         lightSpread(a, v3s16(x - 1, y,     z    ), light);
339                                 }
340                         }
341                 }
342         }
343
344         //printf("spreadLight: %dms\n", t.stop());
345 }
346
347
348 ////
349 //// GenerateNotifier
350 ////
351
352 GenerateNotifier::GenerateNotifier()
353 {
354         m_notify_on = 0;
355 }
356
357
358 GenerateNotifier::GenerateNotifier(u32 notify_on,
359         std::set<u32> *notify_on_deco_ids)
360 {
361         m_notify_on = notify_on;
362         m_notify_on_deco_ids = notify_on_deco_ids;
363 }
364
365
366 void GenerateNotifier::setNotifyOn(u32 notify_on)
367 {
368         m_notify_on = notify_on;
369 }
370
371
372 void GenerateNotifier::setNotifyOnDecoIds(std::set<u32> *notify_on_deco_ids)
373 {
374         m_notify_on_deco_ids = notify_on_deco_ids;
375 }
376
377
378 bool GenerateNotifier::addEvent(GenNotifyType type, v3s16 pos, u32 id)
379 {
380         if (!(m_notify_on & (1 << type)))
381                 return false;
382
383         if (type == GENNOTIFY_DECORATION &&
384                 m_notify_on_deco_ids->find(id) == m_notify_on_deco_ids->end())
385                 return false;
386
387         GenNotifyEvent gne;
388         gne.type = type;
389         gne.pos  = pos;
390         gne.id   = id;
391         m_notify_events.push_back(gne);
392
393         return true;
394 }
395
396
397 void GenerateNotifier::getEvents(
398         std::map<std::string, std::vector<v3s16> > &event_map,
399         bool peek_events)
400 {
401         std::list<GenNotifyEvent>::iterator it;
402
403         for (it = m_notify_events.begin(); it != m_notify_events.end(); ++it) {
404                 GenNotifyEvent &gn = *it;
405                 std::string name = (gn.type == GENNOTIFY_DECORATION) ?
406                         "decoration#"+ itos(gn.id) :
407                         flagdesc_gennotify[gn.type].name;
408
409                 event_map[name].push_back(gn.pos);
410         }
411
412         if (!peek_events)
413                 m_notify_events.clear();
414 }
415
416
417 ////
418 //// MapgenParams
419 ////
420
421 void MapgenParams::load(const Settings &settings)
422 {
423         std::string seed_str;
424         const char *seed_name = (&settings == g_settings) ? "fixed_map_seed" : "seed";
425
426         if (settings.getNoEx(seed_name, seed_str) && !seed_str.empty())
427                 seed = read_seed(seed_str.c_str());
428         else
429                 myrand_bytes(&seed, sizeof(seed));
430
431         settings.getNoEx("mg_name", mg_name);
432         settings.getS16NoEx("water_level", water_level);
433         settings.getS16NoEx("chunksize", chunksize);
434         settings.getFlagStrNoEx("mg_flags", flags, flagdesc_mapgen);
435         settings.getNoiseParams("mg_biome_np_heat", np_biome_heat);
436         settings.getNoiseParams("mg_biome_np_heat_blend", np_biome_heat_blend);
437         settings.getNoiseParams("mg_biome_np_humidity", np_biome_humidity);
438         settings.getNoiseParams("mg_biome_np_humidity_blend", np_biome_humidity_blend);
439
440         delete sparams;
441         MapgenFactory *mgfactory = EmergeManager::getMapgenFactory(mg_name);
442         if (mgfactory) {
443                 sparams = mgfactory->createMapgenParams();
444                 sparams->readParams(&settings);
445         }
446 }
447
448
449 void MapgenParams::save(Settings &settings) const
450 {
451         settings.set("mg_name", mg_name);
452         settings.setU64("seed", seed);
453         settings.setS16("water_level", water_level);
454         settings.setS16("chunksize", chunksize);
455         settings.setFlagStr("mg_flags", flags, flagdesc_mapgen, U32_MAX);
456         settings.setNoiseParams("mg_biome_np_heat", np_biome_heat);
457         settings.setNoiseParams("mg_biome_np_heat_blend", np_biome_heat_blend);
458         settings.setNoiseParams("mg_biome_np_humidity", np_biome_humidity);
459         settings.setNoiseParams("mg_biome_np_humidity_blend", np_biome_humidity_blend);
460
461         if (sparams)
462                 sparams->writeParams(&settings);
463 }