src/emerge.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20
  21 #include "server.h"
  22 #include <iostream>
  23 #include <queue>
  24 #include "clientserver.h"
  25 #include "map.h"
  26 #include "jmutexautolock.h"
  27 #include "main.h"
  28 #include "constants.h"
  29 #include "voxel.h"
  30 #include "config.h"
  31 #include "mapblock.h"
  32 #include "serverobject.h"
  33 #include "settings.h"
  34 #include "script.h"
  35 #include "scriptapi.h"
  36 #include "profiler.h"
  37 #include "log.h"
  38 #include "nodedef.h"
  39 #include "biome.h"
  40 #include "emerge.h"
  41 #include "mapgen_v6.h"
  42
  43
  44 /////////////////////////////// Emerge Manager ////////////////////////////////
  45
  46 EmergeManager::EmergeManager(IGameDef *gamedef, BiomeDefManager *bdef) {
  47         //register built-in mapgens
  48         registerMapgen("v6", new MapgenFactoryV6());
  49
  50         this->biomedef = bdef ? bdef : new BiomeDefManager(gamedef);
  51         this->params   = NULL;
  52
  53         mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
  54
  55         queuemutex.Init();
  56
  57         int nthreads;
  58         if (g_settings->get("num_emerge_threads").empty()) {
  59                 int nprocs = porting::getNumberOfProcessors();
  60                 // leave a proc for the main thread and one for some other misc threads
  61                 nthreads = (nprocs > 2) ? nprocs - 2 : 1;
  62         } else {
  63                 nthreads = g_settings->getU16("num_emerge_threads");
  64         }
  65         if (nthreads < 1)
  66                 nthreads = 1;
  67
  68         qlimit_total    = g_settings->getU16("emergequeue_limit_total");
  69         qlimit_diskonly = g_settings->get("emergequeue_limit_diskonly").empty() ?
  70                 nthreads * 5 + 1 :
  71                 g_settings->getU16("emergequeue_limit_diskonly");
  72         qlimit_generate = g_settings->get("emergequeue_limit_generate").empty() ?
  73                 nthreads + 1 :
  74                 g_settings->getU16("emergequeue_limit_generate");
  75
  76         for (int i = 0; i != nthreads; i++)
  77                 emergethread.push_back(new EmergeThread((Server *)gamedef, i));
  78
  79         infostream << "EmergeManager: using " << nthreads << " threads" << std::endl;
  80 }
  81
  82
  83 EmergeManager::~EmergeManager() {
  84         for (unsigned int i = 0; i != emergethread.size(); i++) {
  85                 emergethread[i]->setRun(false);
  86                 emergethread[i]->qevent.signal();
  87                 emergethread[i]->stop();
  88                 delete emergethread[i];
  89                 delete mapgen[i];
  90         }
  91
  92         delete biomedef;
  93         delete params;
  94 }
  95
  96
  97 void EmergeManager::initMapgens(MapgenParams *mgparams) {
  98         Mapgen *mg;
  99
 100         if (mapgen.size())
 101                 return;
 102
 103         this->params = mgparams;
 104         for (unsigned int i = 0; i != emergethread.size(); i++) {
 105                 mg = createMapgen(params->mg_name, 0, params);
 106                 if (!mg) {
 107                         infostream << "EmergeManager: falling back to mapgen v6" << std::endl;
 108                         delete params;
 109                         params = createMapgenParams("v6");
 110                         mg = createMapgen("v6", 0, params);
 111                 }
 112                 mapgen.push_back(mg);
 113         }
 114 }
 115
 116
 117 bool EmergeManager::enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate) {
 118         std::map<v3s16, BlockEmergeData *>::const_iterator iter;
 119         BlockEmergeData *bedata;
 120         u16 count;
 121         u8 flags = 0;
 122         int idx = 0;
 123
 124         if (allow_generate)
 125                 flags |= BLOCK_EMERGE_ALLOWGEN;
 126
 127         {
 128                 JMutexAutoLock queuelock(queuemutex);
 129
 130                 count = blocks_enqueued.size();
 131                 if (count >= qlimit_total)
 132                         return false;
 133
 134                 count = peer_queue_count[peer_id];
 135                 u16 qlimit_peer = allow_generate ? qlimit_generate : qlimit_diskonly;
 136                 if (count >= qlimit_peer)
 137                         return false;
 138
 139                 iter = blocks_enqueued.find(p);
 140                 if (iter != blocks_enqueued.end()) {
 141                         bedata = iter->second;
 142                         bedata->flags |= flags;
 143                         return true;
 144                 }
 145
 146                 bedata = new BlockEmergeData;
 147                 bedata->flags = flags;
 148                 bedata->peer_requested = peer_id;
 149                 blocks_enqueued.insert(std::make_pair(p, bedata));
 150
 151                 peer_queue_count[peer_id] = count + 1;
 152
 153                 // insert into the EmergeThread queue with the least items
 154                 int lowestitems = emergethread[0]->blockqueue.size();
 155                 for (unsigned int i = 1; i != emergethread.size(); i++) {
 156                         int nitems = emergethread[i]->blockqueue.size();
 157                         if (nitems < lowestitems) {
 158                                 idx = i;
 159                                 lowestitems = nitems;
 160                         }
 161                 }
 162
 163                 emergethread[idx]->blockqueue.push(p);
 164         }
 165         emergethread[idx]->qevent.signal();
 166
 167         return true;
 168 }
 169
 170
 171 int EmergeManager::getGroundLevelAtPoint(v2s16 p) {
 172         if (mapgen.size() == 0 || !mapgen[0]) {
 173                 errorstream << "EmergeManager: getGroundLevelAtPoint() called"
 174                 " before mapgen initialized" << std::endl;
 175                 return 0;
 176         }
 177
 178         return mapgen[0]->getGroundLevelAtPoint(p);
 179 }
 180
 181
 182 bool EmergeManager::isBlockUnderground(v3s16 blockpos) {
 183         /*
 184         v2s16 p = v2s16((blockpos.X * MAP_BLOCKSIZE) + MAP_BLOCKSIZE / 2,
 185                                         (blockpos.Y * MAP_BLOCKSIZE) + MAP_BLOCKSIZE / 2);
 186         int ground_level = getGroundLevelAtPoint(p);
 187         return blockpos.Y * (MAP_BLOCKSIZE + 1) <= min(water_level, ground_level);
 188         */
 189
 190         //yuck, but then again, should i bother being accurate?
 191         //the height of the nodes in a single block is quite variable
 192         return blockpos.Y * (MAP_BLOCKSIZE + 1) <= params->water_level;
 193 }
 194
 195
 196 u32 EmergeManager::getBlockSeed(v3s16 p) {
 197         return (u32)(params->seed & 0xFFFFFFFF) +
 198                 p.Z * 38134234 +
 199                 p.Y * 42123 +
 200                 p.X * 23;
 201 }
 202
 203
 204 Mapgen *EmergeManager::createMapgen(std::string mgname, int mgid,
 205                                                                          MapgenParams *mgparams) {
 206         std::map<std::string, MapgenFactory *>::const_iterator iter;
 207         iter = mglist.find(mgname);
 208         if (iter == mglist.end()) {
 209                 errorstream << "EmergeManager; mapgen " << mgname <<
 210                  " not registered" << std::endl;
 211                 return NULL;
 212         }
 213
 214         MapgenFactory *mgfactory = iter->second;
 215         return mgfactory->createMapgen(mgid, mgparams, this);
 216 }
 217
 218
 219 MapgenParams *EmergeManager::createMapgenParams(std::string mgname) {
 220         std::map<std::string, MapgenFactory *>::const_iterator iter;
 221         iter = mglist.find(mgname);
 222         if (iter == mglist.end()) {
 223                 errorstream << "EmergeManager: mapgen " << mgname <<
 224                  " not registered" << std::endl;
 225                 return NULL;
 226         }
 227
 228         MapgenFactory *mgfactory = iter->second;
 229         return mgfactory->createMapgenParams();
 230 }
 231
 232
 233 MapgenParams *EmergeManager::getParamsFromSettings(Settings *settings) {
 234         std::string mg_name = settings->get("mg_name");
 235         MapgenParams *mgparams = createMapgenParams(mg_name);
 236
 237         mgparams->mg_name     = mg_name;
 238         mgparams->seed        = settings->getU64(settings == g_settings ? "fixed_map_seed" : "seed");
 239         mgparams->water_level = settings->getS16("water_level");
 240         mgparams->chunksize   = settings->getS16("chunksize");
 241         mgparams->flags       = settings->getFlagStr("mg_flags", flagdesc_mapgen);
 242
 243         if (!mgparams->readParams(settings)) {
 244                 delete mgparams;
 245                 return NULL;
 246         }
 247         return mgparams;
 248 }
 249
 250
 251 void EmergeManager::setParamsToSettings(Settings *settings) {
 252         settings->set("mg_name",         params->mg_name);
 253         settings->setU64("seed",         params->seed);
 254         settings->setS16("water_level",  params->water_level);
 255         settings->setS16("chunksize",    params->chunksize);
 256         settings->setFlagStr("mg_flags", params->flags, flagdesc_mapgen);
 257
 258         params->writeParams(settings);
 259 }
 260
 261
 262 void EmergeManager::registerMapgen(std::string mgname, MapgenFactory *mgfactory) {
 263         mglist.insert(std::make_pair(mgname, mgfactory));
 264         infostream << "EmergeManager: registered mapgen " << mgname << std::endl;
 265 }
 266
 267
 268 ////////////////////////////// Emerge Thread //////////////////////////////////
 269
 270 bool EmergeThread::popBlockEmerge(v3s16 *pos, u8 *flags) {
 271         std::map<v3s16, BlockEmergeData *>::iterator iter;
 272         JMutexAutoLock queuelock(emerge->queuemutex);
 273
 274         if (blockqueue.empty())
 275                 return false;
 276         v3s16 p = blockqueue.front();
 277         blockqueue.pop();
 278
 279         *pos = p;
 280
 281         iter = emerge->blocks_enqueued.find(p);
 282         if (iter == emerge->blocks_enqueued.end())
 283                 return false; //uh oh, queue and map out of sync!!
 284
 285         BlockEmergeData *bedata = iter->second;
 286         *flags = bedata->flags;
 287
 288         emerge->peer_queue_count[bedata->peer_requested]--;
 289
 290         delete bedata;
 291         emerge->blocks_enqueued.erase(iter);
 292
 293         return true;
 294 }
 295
 296
 297 bool EmergeThread::getBlockOrStartGen(v3s16 p, MapBlock **b,
 298                                                                         BlockMakeData *data, bool allow_gen) {
 299         v2s16 p2d(p.X, p.Z);
 300         //envlock: usually takes <=1ms, sometimes 90ms or ~400ms to acquire
 301         JMutexAutoLock envlock(m_server->m_env_mutex);
 302
 303         // Load sector if it isn't loaded
 304         if (map->getSectorNoGenerateNoEx(p2d) == NULL)
 305                 map->loadSectorMeta(p2d);
 306
 307         // Attempt to load block
 308         MapBlock *block = map->getBlockNoCreateNoEx(p);
 309         if (!block || block->isDummy() || !block->isGenerated()) {
 310                 EMERGE_DBG_OUT("not in memory, attempting to load from disk");
 311                 block = map->loadBlock(p);
 312         }
 313
 314         // If could not load and allowed to generate,
 315         // start generation inside this same envlock
 316         if (allow_gen && (block == NULL || !block->isGenerated())) {
 317                 EMERGE_DBG_OUT("generating");
 318                 *b = block;
 319                 return map->initBlockMake(data, p);
 320         }
 321
 322         *b = block;
 323         return false;
 324 }
 325
 326
 327 void *EmergeThread::Thread() {
 328         ThreadStarted();
 329         log_register_thread("EmergeThread" + id);
 330         DSTACK(__FUNCTION_NAME);
 331         BEGIN_DEBUG_EXCEPTION_HANDLER
 332
 333         v3s16 last_tried_pos(-32768,-32768,-32768); // For error output
 334         v3s16 p;
 335         u8 flags;
 336
 337         map    = (ServerMap *)&(m_server->m_env->getMap());
 338         emerge = m_server->m_emerge;
 339         mapgen = emerge->mapgen[id];
 340         enable_mapgen_debug_info = emerge->mapgen_debug_info;
 341
 342         while (getRun())
 343         try {
 344                 if (!popBlockEmerge(&p, &flags)) {
 345                         qevent.wait();
 346                         continue;
 347                 }
 348
 349                 last_tried_pos = p;
 350                 if (blockpos_over_limit(p))
 351                         continue;
 352
 353                 bool allow_generate = flags & BLOCK_EMERGE_ALLOWGEN;
 354                 EMERGE_DBG_OUT("p=" PP(p) " allow_generate=" << allow_generate);
 355
 356                 /*
 357                         Try to fetch block from memory or disk.
 358                         If not found and asked to generate, initialize generator.
 359                 */
 360                 BlockMakeData data;
 361                 MapBlock *block = NULL;
 362                 std::map<v3s16, MapBlock *> modified_blocks;
 363
 364                 if (getBlockOrStartGen(p, &block, &data, allow_generate)) {
 365                         {
 366                                 ScopeProfiler sp(g_profiler, "EmergeThread: Mapgen::makeChunk", SPT_AVG);
 367                                 TimeTaker t("mapgen::make_block()");
 368
 369                                 mapgen->makeChunk(&data);
 370
 371                                 if (enable_mapgen_debug_info == false)
 372                                         t.stop(true); // Hide output
 373                         }
 374
 375                         {
 376                                 //envlock: usually 0ms, but can take either 30 or 400ms to acquire
 377                                 JMutexAutoLock envlock(m_server->m_env_mutex);
 378                                 ScopeProfiler sp(g_profiler, "EmergeThread: after "
 379                                                 "Mapgen::makeChunk (envlock)", SPT_AVG);
 380
 381                                 map->finishBlockMake(&data, modified_blocks);
 382
 383                                 block = map->getBlockNoCreateNoEx(p);
 384                                 if (block) {
 385                                         /*
 386                                                 Do some post-generate stuff
 387                                         */
 388                                         v3s16 minp = data.blockpos_min * MAP_BLOCKSIZE;
 389                                         v3s16 maxp = data.blockpos_max * MAP_BLOCKSIZE +
 390                                                                  v3s16(1,1,1) * (MAP_BLOCKSIZE - 1);
 391
 392                                         // Ignore map edit events, they will not need to be sent
 393                                         // to anybody because the block hasn't been sent to anybody
 394                                         MapEditEventAreaIgnorer
 395                                                 ign(&m_server->m_ignore_map_edit_events_area,
 396                                                 VoxelArea(minp, maxp));
 397                                         {  // takes about 90ms with -O1 on an e3-1230v2
 398                                                 scriptapi_environment_on_generated(m_server->m_lua,
 399                                                                 minp, maxp, emerge->getBlockSeed(minp));
 400                                         }
 401
 402                                         EMERGE_DBG_OUT("ended up with: " << analyze_block(block));
 403
 404                                         m_server->m_env->activateBlock(block, 0);
 405                                 }
 406                         }
 407                 }
 408
 409                 /*
 410                         Set sent status of modified blocks on clients
 411                 */
 412
 413                 // NOTE: Server's clients are also behind the connection mutex
 414                 //conlock: consistently takes 30-40ms to acquire
 415                 JMutexAutoLock lock(m_server->m_con_mutex);
 416                 // Add the originally fetched block to the modified list
 417                 if (block)
 418                         modified_blocks[p] = block;
 419
 420                 // Set the modified blocks unsent for all the clients
 421                 for (std::map<u16, RemoteClient*>::iterator
 422                          i = m_server->m_clients.begin();
 423                          i != m_server->m_clients.end(); ++i) {
 424                         RemoteClient *client = i->second;
 425                         if (modified_blocks.size() > 0) {
 426                                 // Remove block from sent history
 427                                 client->SetBlocksNotSent(modified_blocks);
 428                         }
 429                 }
 430         }
 431         catch (VersionMismatchException &e) {
 432                 std::ostringstream err;
 433                 err << "World data version mismatch in MapBlock "<<PP(last_tried_pos)<<std::endl;
 434                 err << "----"<<std::endl;
 435                 err << "\""<<e.what()<<"\""<<std::endl;
 436                 err << "See debug.txt."<<std::endl;
 437                 err << "World probably saved by a newer version of Minetest."<<std::endl;
 438                 m_server->setAsyncFatalError(err.str());
 439         }
 440         catch (SerializationError &e) {
 441                 std::ostringstream err;
 442                 err << "Invalid data in MapBlock "<<PP(last_tried_pos)<<std::endl;
 443                 err << "----"<<std::endl;
 444                 err << "\""<<e.what()<<"\""<<std::endl;
 445                 err << "See debug.txt."<<std::endl;
 446                 err << "You can ignore this using [ignore_world_load_errors = true]."<<std::endl;
 447                 m_server->setAsyncFatalError(err.str());
 448         }
 449
 450         END_DEBUG_EXCEPTION_HANDLER(errorstream)
 451         log_deregister_thread();
 452         return NULL;
 453 }