src/map.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 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 #include "map.h"
  21 #include "mapsector.h"
  22 #include "mapblock.h"
  23 #include "filesys.h"
  24 #include "voxel.h"
  25 #include "voxelalgorithms.h"
  26 #include "porting.h"
  27 #include "serialization.h"
  28 #include "nodemetadata.h"
  29 #include "settings.h"
  30 #include "log.h"
  31 #include "profiler.h"
  32 #include "nodedef.h"
  33 #include "gamedef.h"
  34 #include "util/directiontables.h"
  35 #include "util/basic_macros.h"
  36 #include "rollback_interface.h"
  37 #include "environment.h"
  38 #include "reflowscan.h"
  39 #include "emerge.h"
  40 #include "mapgen_v6.h"
  41 #include "mg_biome.h"
  42 #include "config.h"
  43 #include "server.h"
  44 #include "database.h"
  45 #include "database-dummy.h"
  46 #include "database-sqlite3.h"
  47 #include <deque>
  48 #include <queue>
  49 #if USE_LEVELDB
  50 #include "database-leveldb.h"
  51 #endif
  52 #if USE_REDIS
  53 #include "database-redis.h"
  54 #endif
  55 #if USE_POSTGRESQL
  56 #include "database-postgresql.h"
  57 #endif
  58
  59
  60 /*
  61         Map
  62 */
  63
  64 Map::Map(std::ostream &dout, IGameDef *gamedef):
  65         m_dout(dout),
  66         m_gamedef(gamedef),
  67         m_sector_cache(NULL),
  68         m_nodedef(gamedef->ndef()),
  69         m_transforming_liquid_loop_count_multiplier(1.0f),
  70         m_unprocessed_count(0),
  71         m_inc_trending_up_start_time(0),
  72         m_queue_size_timer_started(false)
  73 {
  74 }
  75
  76 Map::~Map()
  77 {
  78         /*
  79                 Free all MapSectors
  80         */
  81         for(std::map<v2s16, MapSector*>::iterator i = m_sectors.begin();
  82                 i != m_sectors.end(); ++i)
  83         {
  84                 delete i->second;
  85         }
  86 }
  87
  88 void Map::addEventReceiver(MapEventReceiver *event_receiver)
  89 {
  90         m_event_receivers.insert(event_receiver);
  91 }
  92
  93 void Map::removeEventReceiver(MapEventReceiver *event_receiver)
  94 {
  95         m_event_receivers.erase(event_receiver);
  96 }
  97
  98 void Map::dispatchEvent(MapEditEvent *event)
  99 {
 100         for(std::set<MapEventReceiver*>::iterator
 101                         i = m_event_receivers.begin();
 102                         i != m_event_receivers.end(); ++i)
 103         {
 104                 (*i)->onMapEditEvent(event);
 105         }
 106 }
 107
 108 MapSector * Map::getSectorNoGenerateNoExNoLock(v2s16 p)
 109 {
 110         if(m_sector_cache != NULL && p == m_sector_cache_p){
 111                 MapSector * sector = m_sector_cache;
 112                 return sector;
 113         }
 114
 115         std::map<v2s16, MapSector*>::iterator n = m_sectors.find(p);
 116
 117         if(n == m_sectors.end())
 118                 return NULL;
 119
 120         MapSector *sector = n->second;
 121
 122         // Cache the last result
 123         m_sector_cache_p = p;
 124         m_sector_cache = sector;
 125
 126         return sector;
 127 }
 128
 129 MapSector * Map::getSectorNoGenerateNoEx(v2s16 p)
 130 {
 131         return getSectorNoGenerateNoExNoLock(p);
 132 }
 133
 134 MapSector * Map::getSectorNoGenerate(v2s16 p)
 135 {
 136         MapSector *sector = getSectorNoGenerateNoEx(p);
 137         if(sector == NULL)
 138                 throw InvalidPositionException();
 139
 140         return sector;
 141 }
 142
 143 MapBlock * Map::getBlockNoCreateNoEx(v3s16 p3d)
 144 {
 145         v2s16 p2d(p3d.X, p3d.Z);
 146         MapSector * sector = getSectorNoGenerateNoEx(p2d);
 147         if(sector == NULL)
 148                 return NULL;
 149         MapBlock *block = sector->getBlockNoCreateNoEx(p3d.Y);
 150         return block;
 151 }
 152
 153 MapBlock * Map::getBlockNoCreate(v3s16 p3d)
 154 {
 155         MapBlock *block = getBlockNoCreateNoEx(p3d);
 156         if(block == NULL)
 157                 throw InvalidPositionException();
 158         return block;
 159 }
 160
 161 bool Map::isNodeUnderground(v3s16 p)
 162 {
 163         v3s16 blockpos = getNodeBlockPos(p);
 164         try{
 165                 MapBlock * block = getBlockNoCreate(blockpos);
 166                 return block->getIsUnderground();
 167         }
 168         catch(InvalidPositionException &e)
 169         {
 170                 return false;
 171         }
 172 }
 173
 174 bool Map::isValidPosition(v3s16 p)
 175 {
 176         v3s16 blockpos = getNodeBlockPos(p);
 177         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 178         return (block != NULL);
 179 }
 180
 181 // Returns a CONTENT_IGNORE node if not found
 182 MapNode Map::getNodeNoEx(v3s16 p, bool *is_valid_position)
 183 {
 184         v3s16 blockpos = getNodeBlockPos(p);
 185         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 186         if (block == NULL) {
 187                 if (is_valid_position != NULL)
 188                         *is_valid_position = false;
 189                 return MapNode(CONTENT_IGNORE);
 190         }
 191
 192         v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
 193         bool is_valid_p;
 194         MapNode node = block->getNodeNoCheck(relpos, &is_valid_p);
 195         if (is_valid_position != NULL)
 196                 *is_valid_position = is_valid_p;
 197         return node;
 198 }
 199
 200 #if 0
 201 // Deprecated
 202 // throws InvalidPositionException if not found
 203 // TODO: Now this is deprecated, getNodeNoEx should be renamed
 204 MapNode Map::getNode(v3s16 p)
 205 {
 206         v3s16 blockpos = getNodeBlockPos(p);
 207         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 208         if (block == NULL)
 209                 throw InvalidPositionException();
 210         v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
 211         bool is_valid_position;
 212         MapNode node = block->getNodeNoCheck(relpos, &is_valid_position);
 213         if (!is_valid_position)
 214                 throw InvalidPositionException();
 215         return node;
 216 }
 217 #endif
 218
 219 // throws InvalidPositionException if not found
 220 void Map::setNode(v3s16 p, MapNode & n)
 221 {
 222         v3s16 blockpos = getNodeBlockPos(p);
 223         MapBlock *block = getBlockNoCreate(blockpos);
 224         v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
 225         // Never allow placing CONTENT_IGNORE, it fucks up stuff
 226         if(n.getContent() == CONTENT_IGNORE){
 227                 bool temp_bool;
 228                 errorstream<<"Map::setNode(): Not allowing to place CONTENT_IGNORE"
 229                                 <<" while trying to replace \""
 230                                 <<m_nodedef->get(block->getNodeNoCheck(relpos, &temp_bool)).name
 231                                 <<"\" at "<<PP(p)<<" (block "<<PP(blockpos)<<")"<<std::endl;
 232                 debug_stacks_print_to(infostream);
 233                 return;
 234         }
 235         block->setNodeNoCheck(relpos, n);
 236 }
 237
 238 void Map::addNodeAndUpdate(v3s16 p, MapNode n,
 239                 std::map<v3s16, MapBlock*> &modified_blocks,
 240                 bool remove_metadata)
 241 {
 242         // Collect old node for rollback
 243         RollbackNode rollback_oldnode(this, p, m_gamedef);
 244
 245         // This is needed for updating the lighting
 246         MapNode oldnode = getNodeNoEx(p);
 247
 248         // Remove node metadata
 249         if (remove_metadata) {
 250                 removeNodeMetadata(p);
 251         }
 252
 253         // Set the node on the map
 254         // Ignore light (because calling voxalgo::update_lighting_nodes)
 255         n.setLight(LIGHTBANK_DAY, 0, m_nodedef);
 256         n.setLight(LIGHTBANK_NIGHT, 0, m_nodedef);
 257         setNode(p, n);
 258
 259         // Update lighting
 260         std::vector<std::pair<v3s16, MapNode> > oldnodes;
 261         oldnodes.push_back(std::pair<v3s16, MapNode>(p, oldnode));
 262         voxalgo::update_lighting_nodes(this, oldnodes, modified_blocks);
 263
 264         for(std::map<v3s16, MapBlock*>::iterator
 265                         i = modified_blocks.begin();
 266                         i != modified_blocks.end(); ++i)
 267         {
 268                 i->second->expireDayNightDiff();
 269         }
 270
 271         // Report for rollback
 272         if(m_gamedef->rollback())
 273         {
 274                 RollbackNode rollback_newnode(this, p, m_gamedef);
 275                 RollbackAction action;
 276                 action.setSetNode(p, rollback_oldnode, rollback_newnode);
 277                 m_gamedef->rollback()->reportAction(action);
 278         }
 279
 280         /*
 281                 Add neighboring liquid nodes and this node to transform queue.
 282                 (it's vital for the node itself to get updated last, if it was removed.)
 283          */
 284         v3s16 dirs[7] = {
 285                 v3s16(0,0,1), // back
 286                 v3s16(0,1,0), // top
 287                 v3s16(1,0,0), // right
 288                 v3s16(0,0,-1), // front
 289                 v3s16(0,-1,0), // bottom
 290                 v3s16(-1,0,0), // left
 291                 v3s16(0,0,0), // self
 292         };
 293         for(u16 i=0; i<7; i++)
 294         {
 295                 v3s16 p2 = p + dirs[i];
 296
 297                 bool is_valid_position;
 298                 MapNode n2 = getNodeNoEx(p2, &is_valid_position);
 299                 if(is_valid_position &&
 300                                 (m_nodedef->get(n2).isLiquid() ||
 301                                 n2.getContent() == CONTENT_AIR))
 302                         m_transforming_liquid.push_back(p2);
 303         }
 304 }
 305
 306 void Map::removeNodeAndUpdate(v3s16 p,
 307                 std::map<v3s16, MapBlock*> &modified_blocks)
 308 {
 309         addNodeAndUpdate(p, MapNode(CONTENT_AIR), modified_blocks, true);
 310 }
 311
 312 bool Map::addNodeWithEvent(v3s16 p, MapNode n, bool remove_metadata)
 313 {
 314         MapEditEvent event;
 315         event.type = remove_metadata ? MEET_ADDNODE : MEET_SWAPNODE;
 316         event.p = p;
 317         event.n = n;
 318
 319         bool succeeded = true;
 320         try{
 321                 std::map<v3s16, MapBlock*> modified_blocks;
 322                 addNodeAndUpdate(p, n, modified_blocks, remove_metadata);
 323
 324                 // Copy modified_blocks to event
 325                 for(std::map<v3s16, MapBlock*>::iterator
 326                                 i = modified_blocks.begin();
 327                                 i != modified_blocks.end(); ++i)
 328                 {
 329                         event.modified_blocks.insert(i->first);
 330                 }
 331         }
 332         catch(InvalidPositionException &e){
 333                 succeeded = false;
 334         }
 335
 336         dispatchEvent(&event);
 337
 338         return succeeded;
 339 }
 340
 341 bool Map::removeNodeWithEvent(v3s16 p)
 342 {
 343         MapEditEvent event;
 344         event.type = MEET_REMOVENODE;
 345         event.p = p;
 346
 347         bool succeeded = true;
 348         try{
 349                 std::map<v3s16, MapBlock*> modified_blocks;
 350                 removeNodeAndUpdate(p, modified_blocks);
 351
 352                 // Copy modified_blocks to event
 353                 for(std::map<v3s16, MapBlock*>::iterator
 354                                 i = modified_blocks.begin();
 355                                 i != modified_blocks.end(); ++i)
 356                 {
 357                         event.modified_blocks.insert(i->first);
 358                 }
 359         }
 360         catch(InvalidPositionException &e){
 361                 succeeded = false;
 362         }
 363
 364         dispatchEvent(&event);
 365
 366         return succeeded;
 367 }
 368
 369 bool Map::getDayNightDiff(v3s16 blockpos)
 370 {
 371         try{
 372                 v3s16 p = blockpos + v3s16(0,0,0);
 373                 MapBlock *b = getBlockNoCreate(p);
 374                 if(b->getDayNightDiff())
 375                         return true;
 376         }
 377         catch(InvalidPositionException &e){}
 378         // Leading edges
 379         try{
 380                 v3s16 p = blockpos + v3s16(-1,0,0);
 381                 MapBlock *b = getBlockNoCreate(p);
 382                 if(b->getDayNightDiff())
 383                         return true;
 384         }
 385         catch(InvalidPositionException &e){}
 386         try{
 387                 v3s16 p = blockpos + v3s16(0,-1,0);
 388                 MapBlock *b = getBlockNoCreate(p);
 389                 if(b->getDayNightDiff())
 390                         return true;
 391         }
 392         catch(InvalidPositionException &e){}
 393         try{
 394                 v3s16 p = blockpos + v3s16(0,0,-1);
 395                 MapBlock *b = getBlockNoCreate(p);
 396                 if(b->getDayNightDiff())
 397                         return true;
 398         }
 399         catch(InvalidPositionException &e){}
 400         // Trailing edges
 401         try{
 402                 v3s16 p = blockpos + v3s16(1,0,0);
 403                 MapBlock *b = getBlockNoCreate(p);
 404                 if(b->getDayNightDiff())
 405                         return true;
 406         }
 407         catch(InvalidPositionException &e){}
 408         try{
 409                 v3s16 p = blockpos + v3s16(0,1,0);
 410                 MapBlock *b = getBlockNoCreate(p);
 411                 if(b->getDayNightDiff())
 412                         return true;
 413         }
 414         catch(InvalidPositionException &e){}
 415         try{
 416                 v3s16 p = blockpos + v3s16(0,0,1);
 417                 MapBlock *b = getBlockNoCreate(p);
 418                 if(b->getDayNightDiff())
 419                         return true;
 420         }
 421         catch(InvalidPositionException &e){}
 422
 423         return false;
 424 }
 425
 426 struct TimeOrderedMapBlock {
 427         MapSector *sect;
 428         MapBlock *block;
 429
 430         TimeOrderedMapBlock(MapSector *sect, MapBlock *block) :
 431                 sect(sect),
 432                 block(block)
 433         {}
 434
 435         bool operator<(const TimeOrderedMapBlock &b) const
 436         {
 437                 return block->getUsageTimer() < b.block->getUsageTimer();
 438         };
 439 };
 440
 441 /*
 442         Updates usage timers
 443 */
 444 void Map::timerUpdate(float dtime, float unload_timeout, u32 max_loaded_blocks,
 445                 std::vector<v3s16> *unloaded_blocks)
 446 {
 447         bool save_before_unloading = (mapType() == MAPTYPE_SERVER);
 448
 449         // Profile modified reasons
 450         Profiler modprofiler;
 451
 452         std::vector<v2s16> sector_deletion_queue;
 453         u32 deleted_blocks_count = 0;
 454         u32 saved_blocks_count = 0;
 455         u32 block_count_all = 0;
 456
 457         beginSave();
 458
 459         // If there is no practical limit, we spare creation of mapblock_queue
 460         if (max_loaded_blocks == U32_MAX) {
 461                 for (std::map<v2s16, MapSector*>::iterator si = m_sectors.begin();
 462                                 si != m_sectors.end(); ++si) {
 463                         MapSector *sector = si->second;
 464
 465                         bool all_blocks_deleted = true;
 466
 467                         MapBlockVect blocks;
 468                         sector->getBlocks(blocks);
 469
 470                         for (MapBlockVect::iterator i = blocks.begin();
 471                                         i != blocks.end(); ++i) {
 472                                 MapBlock *block = (*i);
 473
 474                                 block->incrementUsageTimer(dtime);
 475
 476                                 if (block->refGet() == 0
 477                                                 && block->getUsageTimer() > unload_timeout) {
 478                                         v3s16 p = block->getPos();
 479
 480                                         // Save if modified
 481                                         if (block->getModified() != MOD_STATE_CLEAN
 482                                                         && save_before_unloading) {
 483                                                 modprofiler.add(block->getModifiedReasonString(), 1);
 484                                                 if (!saveBlock(block))
 485                                                         continue;
 486                                                 saved_blocks_count++;
 487                                         }
 488
 489                                         // Delete from memory
 490                                         sector->deleteBlock(block);
 491
 492                                         if (unloaded_blocks)
 493                                                 unloaded_blocks->push_back(p);
 494
 495                                         deleted_blocks_count++;
 496                                 } else {
 497                                         all_blocks_deleted = false;
 498                                         block_count_all++;
 499                                 }
 500                         }
 501
 502                         if (all_blocks_deleted) {
 503                                 sector_deletion_queue.push_back(si->first);
 504                         }
 505                 }
 506         } else {
 507                 std::priority_queue<TimeOrderedMapBlock> mapblock_queue;
 508                 for (std::map<v2s16, MapSector*>::iterator si = m_sectors.begin();
 509                                 si != m_sectors.end(); ++si) {
 510                         MapSector *sector = si->second;
 511
 512                         MapBlockVect blocks;
 513                         sector->getBlocks(blocks);
 514
 515                         for(MapBlockVect::iterator i = blocks.begin();
 516                                         i != blocks.end(); ++i) {
 517                                 MapBlock *block = (*i);
 518
 519                                 block->incrementUsageTimer(dtime);
 520                                 mapblock_queue.push(TimeOrderedMapBlock(sector, block));
 521                         }
 522                 }
 523                 block_count_all = mapblock_queue.size();
 524                 // Delete old blocks, and blocks over the limit from the memory
 525                 while (!mapblock_queue.empty() && (mapblock_queue.size() > max_loaded_blocks
 526                                 || mapblock_queue.top().block->getUsageTimer() > unload_timeout)) {
 527                         TimeOrderedMapBlock b = mapblock_queue.top();
 528                         mapblock_queue.pop();
 529
 530                         MapBlock *block = b.block;
 531
 532                         if (block->refGet() != 0)
 533                                 continue;
 534
 535                         v3s16 p = block->getPos();
 536
 537                         // Save if modified
 538                         if (block->getModified() != MOD_STATE_CLEAN && save_before_unloading) {
 539                                 modprofiler.add(block->getModifiedReasonString(), 1);
 540                                 if (!saveBlock(block))
 541                                         continue;
 542                                 saved_blocks_count++;
 543                         }
 544
 545                         // Delete from memory
 546                         b.sect->deleteBlock(block);
 547
 548                         if (unloaded_blocks)
 549                                 unloaded_blocks->push_back(p);
 550
 551                         deleted_blocks_count++;
 552                         block_count_all--;
 553                 }
 554                 // Delete empty sectors
 555                 for (std::map<v2s16, MapSector*>::iterator si = m_sectors.begin();
 556                         si != m_sectors.end(); ++si) {
 557                         if (si->second->empty()) {
 558                                 sector_deletion_queue.push_back(si->first);
 559                         }
 560                 }
 561         }
 562         endSave();
 563
 564         // Finally delete the empty sectors
 565         deleteSectors(sector_deletion_queue);
 566
 567         if(deleted_blocks_count != 0)
 568         {
 569                 PrintInfo(infostream); // ServerMap/ClientMap:
 570                 infostream<<"Unloaded "<<deleted_blocks_count
 571                                 <<" blocks from memory";
 572                 if(save_before_unloading)
 573                         infostream<<", of which "<<saved_blocks_count<<" were written";
 574                 infostream<<", "<<block_count_all<<" blocks in memory";
 575                 infostream<<"."<<std::endl;
 576                 if(saved_blocks_count != 0){
 577                         PrintInfo(infostream); // ServerMap/ClientMap:
 578                         infostream<<"Blocks modified by: "<<std::endl;
 579                         modprofiler.print(infostream);
 580                 }
 581         }
 582 }
 583
 584 void Map::unloadUnreferencedBlocks(std::vector<v3s16> *unloaded_blocks)
 585 {
 586         timerUpdate(0.0, -1.0, 0, unloaded_blocks);
 587 }
 588
 589 void Map::deleteSectors(std::vector<v2s16> &sectorList)
 590 {
 591         for(std::vector<v2s16>::iterator j = sectorList.begin();
 592                 j != sectorList.end(); ++j) {
 593                 MapSector *sector = m_sectors[*j];
 594                 // If sector is in sector cache, remove it from there
 595                 if(m_sector_cache == sector)
 596                         m_sector_cache = NULL;
 597                 // Remove from map and delete
 598                 m_sectors.erase(*j);
 599                 delete sector;
 600         }
 601 }
 602
 603 void Map::PrintInfo(std::ostream &out)
 604 {
 605         out<<"Map: ";
 606 }
 607
 608 #define WATER_DROP_BOOST 4
 609
 610 enum NeighborType {
 611         NEIGHBOR_UPPER,
 612         NEIGHBOR_SAME_LEVEL,
 613         NEIGHBOR_LOWER
 614 };
 615 struct NodeNeighbor {
 616         MapNode n;
 617         NeighborType t;
 618         v3s16 p;
 619         bool l; //can liquid
 620
 621         NodeNeighbor()
 622                 : n(CONTENT_AIR)
 623         { }
 624
 625         NodeNeighbor(const MapNode &node, NeighborType n_type, v3s16 pos)
 626                 : n(node),
 627                   t(n_type),
 628                   p(pos)
 629         { }
 630 };
 631
 632 void Map::transforming_liquid_add(v3s16 p) {
 633         m_transforming_liquid.push_back(p);
 634 }
 635
 636 s32 Map::transforming_liquid_size() {
 637         return m_transforming_liquid.size();
 638 }
 639
 640 void Map::transformLiquids(std::map<v3s16, MapBlock*> &modified_blocks)
 641 {
 642         DSTACK(FUNCTION_NAME);
 643         //TimeTaker timer("transformLiquids()");
 644
 645         u32 loopcount = 0;
 646         u32 initial_size = m_transforming_liquid.size();
 647
 648         /*if(initial_size != 0)
 649                 infostream<<"transformLiquids(): initial_size="<<initial_size<<std::endl;*/
 650
 651         // list of nodes that due to viscosity have not reached their max level height
 652         std::deque<v3s16> must_reflow;
 653
 654         std::vector<std::pair<v3s16, MapNode> > changed_nodes;
 655
 656         u32 liquid_loop_max = g_settings->getS32("liquid_loop_max");
 657         u32 loop_max = liquid_loop_max;
 658
 659 #if 0
 660
 661         /* If liquid_loop_max is not keeping up with the queue size increase
 662          * loop_max up to a maximum of liquid_loop_max * dedicated_server_step.
 663          */
 664         if (m_transforming_liquid.size() > loop_max * 2) {
 665                 // "Burst" mode
 666                 float server_step = g_settings->getFloat("dedicated_server_step");
 667                 if (m_transforming_liquid_loop_count_multiplier - 1.0 < server_step)
 668                         m_transforming_liquid_loop_count_multiplier *= 1.0 + server_step / 10;
 669         } else {
 670                 m_transforming_liquid_loop_count_multiplier = 1.0;
 671         }
 672
 673         loop_max *= m_transforming_liquid_loop_count_multiplier;
 674 #endif
 675
 676         while (m_transforming_liquid.size() != 0)
 677         {
 678                 // This should be done here so that it is done when continue is used
 679                 if (loopcount >= initial_size || loopcount >= loop_max)
 680                         break;
 681                 loopcount++;
 682
 683                 /*
 684                         Get a queued transforming liquid node
 685                 */
 686                 v3s16 p0 = m_transforming_liquid.front();
 687                 m_transforming_liquid.pop_front();
 688
 689                 MapNode n0 = getNodeNoEx(p0);
 690
 691                 /*
 692                         Collect information about current node
 693                  */
 694                 s8 liquid_level = -1;
 695                 // The liquid node which will be placed there if
 696                 // the liquid flows into this node.
 697                 content_t liquid_kind = CONTENT_IGNORE;
 698                 // The node which will be placed there if liquid
 699                 // can't flow into this node.
 700                 content_t floodable_node = CONTENT_AIR;
 701                 const ContentFeatures &cf = m_nodedef->get(n0);
 702                 LiquidType liquid_type = cf.liquid_type;
 703                 switch (liquid_type) {
 704                         case LIQUID_SOURCE:
 705                                 liquid_level = LIQUID_LEVEL_SOURCE;
 706                                 liquid_kind = m_nodedef->getId(cf.liquid_alternative_flowing);
 707                                 break;
 708                         case LIQUID_FLOWING:
 709                                 liquid_level = (n0.param2 & LIQUID_LEVEL_MASK);
 710                                 liquid_kind = n0.getContent();
 711                                 break;
 712                         case LIQUID_NONE:
 713                                 // if this node is 'floodable', it *could* be transformed
 714                                 // into a liquid, otherwise, continue with the next node.
 715                                 if (!cf.floodable)
 716                                         continue;
 717                                 floodable_node = n0.getContent();
 718                                 liquid_kind = CONTENT_AIR;
 719                                 break;
 720                 }
 721
 722                 /*
 723                         Collect information about the environment
 724                  */
 725                 const v3s16 *dirs = g_6dirs;
 726                 NodeNeighbor sources[6]; // surrounding sources
 727                 int num_sources = 0;
 728                 NodeNeighbor flows[6]; // surrounding flowing liquid nodes
 729                 int num_flows = 0;
 730                 NodeNeighbor airs[6]; // surrounding air
 731                 int num_airs = 0;
 732                 NodeNeighbor neutrals[6]; // nodes that are solid or another kind of liquid
 733                 int num_neutrals = 0;
 734                 bool flowing_down = false;
 735                 bool ignored_sources = false;
 736                 for (u16 i = 0; i < 6; i++) {
 737                         NeighborType nt = NEIGHBOR_SAME_LEVEL;
 738                         switch (i) {
 739                                 case 1:
 740                                         nt = NEIGHBOR_UPPER;
 741                                         break;
 742                                 case 4:
 743                                         nt = NEIGHBOR_LOWER;
 744                                         break;
 745                         }
 746                         v3s16 npos = p0 + dirs[i];
 747                         NodeNeighbor nb(getNodeNoEx(npos), nt, npos);
 748                         const ContentFeatures &cfnb = m_nodedef->get(nb.n);
 749                         switch (m_nodedef->get(nb.n.getContent()).liquid_type) {
 750                                 case LIQUID_NONE:
 751                                         if (cfnb.floodable) {
 752                                                 airs[num_airs++] = nb;
 753                                                 // if the current node is a water source the neighbor
 754                                                 // should be enqueded for transformation regardless of whether the
 755                                                 // current node changes or not.
 756                                                 if (nb.t != NEIGHBOR_UPPER && liquid_type != LIQUID_NONE)
 757                                                         m_transforming_liquid.push_back(npos);
 758                                                 // if the current node happens to be a flowing node, it will start to flow down here.
 759                                                 if (nb.t == NEIGHBOR_LOWER)
 760                                                         flowing_down = true;
 761                                         } else {
 762                                                 neutrals[num_neutrals++] = nb;
 763                                                 if (nb.n.getContent() == CONTENT_IGNORE) {
 764                                                         // If node below is ignore prevent water from
 765                                                         // spreading outwards and otherwise prevent from
 766                                                         // flowing away as ignore node might be the source
 767                                                         if (nb.t == NEIGHBOR_LOWER)
 768                                                                 flowing_down = true;
 769                                                         else
 770                                                                 ignored_sources = true;
 771                                                 }
 772                                         }
 773                                         break;
 774                                 case LIQUID_SOURCE:
 775                                         // if this node is not (yet) of a liquid type, choose the first liquid type we encounter
 776                                         if (liquid_kind == CONTENT_AIR)
 777                                                 liquid_kind = m_nodedef->getId(cfnb.liquid_alternative_flowing);
 778                                         if (m_nodedef->getId(cfnb.liquid_alternative_flowing) != liquid_kind) {
 779                                                 neutrals[num_neutrals++] = nb;
 780                                         } else {
 781                                                 // Do not count bottom source, it will screw things up
 782                                                 if(dirs[i].Y != -1)
 783                                                         sources[num_sources++] = nb;
 784                                         }
 785                                         break;
 786                                 case LIQUID_FLOWING:
 787                                         // if this node is not (yet) of a liquid type, choose the first liquid type we encounter
 788                                         if (liquid_kind == CONTENT_AIR)
 789                                                 liquid_kind = m_nodedef->getId(cfnb.liquid_alternative_flowing);
 790                                         if (m_nodedef->getId(cfnb.liquid_alternative_flowing) != liquid_kind) {
 791                                                 neutrals[num_neutrals++] = nb;
 792                                         } else {
 793                                                 flows[num_flows++] = nb;
 794                                                 if (nb.t == NEIGHBOR_LOWER)
 795                                                         flowing_down = true;
 796                                         }
 797                                         break;
 798                         }
 799                 }
 800
 801                 /*
 802                         decide on the type (and possibly level) of the current node
 803                  */
 804                 content_t new_node_content;
 805                 s8 new_node_level = -1;
 806                 s8 max_node_level = -1;
 807
 808                 u8 range = m_nodedef->get(liquid_kind).liquid_range;
 809                 if (range > LIQUID_LEVEL_MAX + 1)
 810                         range = LIQUID_LEVEL_MAX + 1;
 811
 812                 if ((num_sources >= 2 && m_nodedef->get(liquid_kind).liquid_renewable) || liquid_type == LIQUID_SOURCE) {
 813                         // liquid_kind will be set to either the flowing alternative of the node (if it's a liquid)
 814                         // or the flowing alternative of the first of the surrounding sources (if it's air), so
 815                         // it's perfectly safe to use liquid_kind here to determine the new node content.
 816                         new_node_content = m_nodedef->getId(m_nodedef->get(liquid_kind).liquid_alternative_source);
 817                 } else if (num_sources >= 1 && sources[0].t != NEIGHBOR_LOWER) {
 818                         // liquid_kind is set properly, see above
 819                         max_node_level = new_node_level = LIQUID_LEVEL_MAX;
 820                         if (new_node_level >= (LIQUID_LEVEL_MAX + 1 - range))
 821                                 new_node_content = liquid_kind;
 822                         else
 823                                 new_node_content = floodable_node;
 824                 } else if (ignored_sources && liquid_level >= 0) {
 825                         // Maybe there are neighbouring sources that aren't loaded yet
 826                         // so prevent flowing away.
 827                         new_node_level = liquid_level;
 828                         new_node_content = liquid_kind;
 829                 } else {
 830                         // no surrounding sources, so get the maximum level that can flow into this node
 831                         for (u16 i = 0; i < num_flows; i++) {
 832                                 u8 nb_liquid_level = (flows[i].n.param2 & LIQUID_LEVEL_MASK);
 833                                 switch (flows[i].t) {
 834                                         case NEIGHBOR_UPPER:
 835                                                 if (nb_liquid_level + WATER_DROP_BOOST > max_node_level) {
 836                                                         max_node_level = LIQUID_LEVEL_MAX;
 837                                                         if (nb_liquid_level + WATER_DROP_BOOST < LIQUID_LEVEL_MAX)
 838                                                                 max_node_level = nb_liquid_level + WATER_DROP_BOOST;
 839                                                 } else if (nb_liquid_level > max_node_level) {
 840                                                         max_node_level = nb_liquid_level;
 841                                                 }
 842                                                 break;
 843                                         case NEIGHBOR_LOWER:
 844                                                 break;
 845                                         case NEIGHBOR_SAME_LEVEL:
 846                                                 if ((flows[i].n.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK &&
 847                                                                 nb_liquid_level > 0 && nb_liquid_level - 1 > max_node_level)
 848                                                         max_node_level = nb_liquid_level - 1;
 849                                                 break;
 850                                 }
 851                         }
 852
 853                         u8 viscosity = m_nodedef->get(liquid_kind).liquid_viscosity;
 854                         if (viscosity > 1 && max_node_level != liquid_level) {
 855                                 // amount to gain, limited by viscosity
 856                                 // must be at least 1 in absolute value
 857                                 s8 level_inc = max_node_level - liquid_level;
 858                                 if (level_inc < -viscosity || level_inc > viscosity)
 859                                         new_node_level = liquid_level + level_inc/viscosity;
 860                                 else if (level_inc < 0)
 861                                         new_node_level = liquid_level - 1;
 862                                 else if (level_inc > 0)
 863                                         new_node_level = liquid_level + 1;
 864                                 if (new_node_level != max_node_level)
 865                                         must_reflow.push_back(p0);
 866                         } else {
 867                                 new_node_level = max_node_level;
 868                         }
 869
 870                         if (max_node_level >= (LIQUID_LEVEL_MAX + 1 - range))
 871                                 new_node_content = liquid_kind;
 872                         else
 873                                 new_node_content = floodable_node;
 874
 875                 }
 876
 877                 /*
 878                         check if anything has changed. if not, just continue with the next node.
 879                  */
 880                 if (new_node_content == n0.getContent() &&
 881                                 (m_nodedef->get(n0.getContent()).liquid_type != LIQUID_FLOWING ||
 882                                 ((n0.param2 & LIQUID_LEVEL_MASK) == (u8)new_node_level &&
 883                                 ((n0.param2 & LIQUID_FLOW_DOWN_MASK) == LIQUID_FLOW_DOWN_MASK)
 884                                 == flowing_down)))
 885                         continue;
 886
 887
 888                 /*
 889                         update the current node
 890                  */
 891                 MapNode n00 = n0;
 892                 //bool flow_down_enabled = (flowing_down && ((n0.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK));
 893                 if (m_nodedef->get(new_node_content).liquid_type == LIQUID_FLOWING) {
 894                         // set level to last 3 bits, flowing down bit to 4th bit
 895                         n0.param2 = (flowing_down ? LIQUID_FLOW_DOWN_MASK : 0x00) | (new_node_level & LIQUID_LEVEL_MASK);
 896                 } else {
 897                         // set the liquid level and flow bit to 0
 898                         n0.param2 = ~(LIQUID_LEVEL_MASK | LIQUID_FLOW_DOWN_MASK);
 899                 }
 900                 n0.setContent(new_node_content);
 901
 902                 // Ignore light (because calling voxalgo::update_lighting_nodes)
 903                 n0.setLight(LIGHTBANK_DAY, 0, m_nodedef);
 904                 n0.setLight(LIGHTBANK_NIGHT, 0, m_nodedef);
 905
 906                 // Find out whether there is a suspect for this action
 907                 std::string suspect;
 908                 if (m_gamedef->rollback())
 909                         suspect = m_gamedef->rollback()->getSuspect(p0, 83, 1);
 910
 911                 if (m_gamedef->rollback() && !suspect.empty()) {
 912                         // Blame suspect
 913                         RollbackScopeActor rollback_scope(m_gamedef->rollback(), suspect, true);
 914                         // Get old node for rollback
 915                         RollbackNode rollback_oldnode(this, p0, m_gamedef);
 916                         // Set node
 917                         setNode(p0, n0);
 918                         // Report
 919                         RollbackNode rollback_newnode(this, p0, m_gamedef);
 920                         RollbackAction action;
 921                         action.setSetNode(p0, rollback_oldnode, rollback_newnode);
 922                         m_gamedef->rollback()->reportAction(action);
 923                 } else {
 924                         // Set node
 925                         setNode(p0, n0);
 926                 }
 927
 928                 v3s16 blockpos = getNodeBlockPos(p0);
 929                 MapBlock *block = getBlockNoCreateNoEx(blockpos);
 930                 if (block != NULL) {
 931                         modified_blocks[blockpos] =  block;
 932                         changed_nodes.push_back(std::pair<v3s16, MapNode>(p0, n00));
 933                 }
 934
 935                 /*
 936                         enqueue neighbors for update if neccessary
 937                  */
 938                 switch (m_nodedef->get(n0.getContent()).liquid_type) {
 939                         case LIQUID_SOURCE:
 940                         case LIQUID_FLOWING:
 941                                 // make sure source flows into all neighboring nodes
 942                                 for (u16 i = 0; i < num_flows; i++)
 943                                         if (flows[i].t != NEIGHBOR_UPPER)
 944                                                 m_transforming_liquid.push_back(flows[i].p);
 945                                 for (u16 i = 0; i < num_airs; i++)
 946                                         if (airs[i].t != NEIGHBOR_UPPER)
 947                                                 m_transforming_liquid.push_back(airs[i].p);
 948                                 break;
 949                         case LIQUID_NONE:
 950                                 // this flow has turned to air; neighboring flows might need to do the same
 951                                 for (u16 i = 0; i < num_flows; i++)
 952                                         m_transforming_liquid.push_back(flows[i].p);
 953                                 break;
 954                 }
 955         }
 956         //infostream<<"Map::transformLiquids(): loopcount="<<loopcount<<std::endl;
 957
 958         for (std::deque<v3s16>::iterator iter = must_reflow.begin(); iter != must_reflow.end(); ++iter)
 959                 m_transforming_liquid.push_back(*iter);
 960
 961         voxalgo::update_lighting_nodes(this, changed_nodes, modified_blocks);
 962
 963
 964         /* ----------------------------------------------------------------------
 965          * Manage the queue so that it does not grow indefinately
 966          */
 967         u16 time_until_purge = g_settings->getU16("liquid_queue_purge_time");
 968
 969         if (time_until_purge == 0)
 970                 return; // Feature disabled
 971
 972         time_until_purge *= 1000;       // seconds -> milliseconds
 973
 974         u32 curr_time = getTime(PRECISION_MILLI);
 975         u32 prev_unprocessed = m_unprocessed_count;
 976         m_unprocessed_count = m_transforming_liquid.size();
 977
 978         // if unprocessed block count is decreasing or stable
 979         if (m_unprocessed_count <= prev_unprocessed) {
 980                 m_queue_size_timer_started = false;
 981         } else {
 982                 if (!m_queue_size_timer_started)
 983                         m_inc_trending_up_start_time = curr_time;
 984                 m_queue_size_timer_started = true;
 985         }
 986
 987         // Account for curr_time overflowing
 988         if (m_queue_size_timer_started && m_inc_trending_up_start_time > curr_time)
 989                 m_queue_size_timer_started = false;
 990
 991         /* If the queue has been growing for more than liquid_queue_purge_time seconds
 992          * and the number of unprocessed blocks is still > liquid_loop_max then we
 993          * cannot keep up; dump the oldest blocks from the queue so that the queue
 994          * has liquid_loop_max items in it
 995          */
 996         if (m_queue_size_timer_started
 997                         && curr_time - m_inc_trending_up_start_time > time_until_purge
 998                         && m_unprocessed_count > liquid_loop_max) {
 999
1000                 size_t dump_qty = m_unprocessed_count - liquid_loop_max;
1001
1002                 infostream << "transformLiquids(): DUMPING " << dump_qty
1003                            << " blocks from the queue" << std::endl;
1004
1005                 while (dump_qty--)
1006                         m_transforming_liquid.pop_front();
1007
1008                 m_queue_size_timer_started = false; // optimistically assume we can keep up now
1009                 m_unprocessed_count = m_transforming_liquid.size();
1010         }
1011 }
1012
1013 std::vector<v3s16> Map::findNodesWithMetadata(v3s16 p1, v3s16 p2)
1014 {
1015         std::vector<v3s16> positions_with_meta;
1016
1017         sortBoxVerticies(p1, p2);
1018         v3s16 bpmin = getNodeBlockPos(p1);
1019         v3s16 bpmax = getNodeBlockPos(p2);
1020
1021         VoxelArea area(p1, p2);
1022
1023         for (s16 z = bpmin.Z; z <= bpmax.Z; z++)
1024         for (s16 y = bpmin.Y; y <= bpmax.Y; y++)
1025         for (s16 x = bpmin.X; x <= bpmax.X; x++) {
1026                 v3s16 blockpos(x, y, z);
1027
1028                 MapBlock *block = getBlockNoCreateNoEx(blockpos);
1029                 if (!block) {
1030                         verbosestream << "Map::getNodeMetadata(): Need to emerge "
1031                                 << PP(blockpos) << std::endl;
1032                         block = emergeBlock(blockpos, false);
1033                 }
1034                 if (!block) {
1035                         infostream << "WARNING: Map::getNodeMetadata(): Block not found"
1036                                 << std::endl;
1037                         continue;
1038                 }
1039
1040                 v3s16 p_base = blockpos * MAP_BLOCKSIZE;
1041                 std::vector<v3s16> keys = block->m_node_metadata.getAllKeys();
1042                 for (size_t i = 0; i != keys.size(); i++) {
1043                         v3s16 p(keys[i] + p_base);
1044                         if (!area.contains(p))
1045                                 continue;
1046
1047                         positions_with_meta.push_back(p);
1048                 }
1049         }
1050
1051         return positions_with_meta;
1052 }
1053
1054 NodeMetadata *Map::getNodeMetadata(v3s16 p)
1055 {
1056         v3s16 blockpos = getNodeBlockPos(p);
1057         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
1058         MapBlock *block = getBlockNoCreateNoEx(blockpos);
1059         if(!block){
1060                 infostream<<"Map::getNodeMetadata(): Need to emerge "
1061                                 <<PP(blockpos)<<std::endl;
1062                 block = emergeBlock(blockpos, false);
1063         }
1064         if(!block){
1065                 warningstream<<"Map::getNodeMetadata(): Block not found"
1066                                 <<std::endl;
1067                 return NULL;
1068         }
1069         NodeMetadata *meta = block->m_node_metadata.get(p_rel);
1070         return meta;
1071 }
1072
1073 bool Map::setNodeMetadata(v3s16 p, NodeMetadata *meta)
1074 {
1075         v3s16 blockpos = getNodeBlockPos(p);
1076         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
1077         MapBlock *block = getBlockNoCreateNoEx(blockpos);
1078         if(!block){
1079                 infostream<<"Map::setNodeMetadata(): Need to emerge "
1080                                 <<PP(blockpos)<<std::endl;
1081                 block = emergeBlock(blockpos, false);
1082         }
1083         if(!block){
1084                 warningstream<<"Map::setNodeMetadata(): Block not found"
1085                                 <<std::endl;
1086                 return false;
1087         }
1088         block->m_node_metadata.set(p_rel, meta);
1089         return true;
1090 }
1091
1092 void Map::removeNodeMetadata(v3s16 p)
1093 {
1094         v3s16 blockpos = getNodeBlockPos(p);
1095         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
1096         MapBlock *block = getBlockNoCreateNoEx(blockpos);
1097         if(block == NULL)
1098         {
1099                 warningstream<<"Map::removeNodeMetadata(): Block not found"
1100                                 <<std::endl;
1101                 return;
1102         }
1103         block->m_node_metadata.remove(p_rel);
1104 }
1105
1106 NodeTimer Map::getNodeTimer(v3s16 p)
1107 {
1108         v3s16 blockpos = getNodeBlockPos(p);
1109         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
1110         MapBlock *block = getBlockNoCreateNoEx(blockpos);
1111         if(!block){
1112                 infostream<<"Map::getNodeTimer(): Need to emerge "
1113                                 <<PP(blockpos)<<std::endl;
1114                 block = emergeBlock(blockpos, false);
1115         }
1116         if(!block){
1117                 warningstream<<"Map::getNodeTimer(): Block not found"
1118                                 <<std::endl;
1119                 return NodeTimer();
1120         }
1121         NodeTimer t = block->m_node_timers.get(p_rel);
1122         NodeTimer nt(t.timeout, t.elapsed, p);
1123         return nt;
1124 }
1125
1126 void Map::setNodeTimer(const NodeTimer &t)
1127 {
1128         v3s16 p = t.position;
1129         v3s16 blockpos = getNodeBlockPos(p);
1130         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
1131         MapBlock *block = getBlockNoCreateNoEx(blockpos);
1132         if(!block){
1133                 infostream<<"Map::setNodeTimer(): Need to emerge "
1134                                 <<PP(blockpos)<<std::endl;
1135                 block = emergeBlock(blockpos, false);
1136         }
1137         if(!block){
1138                 warningstream<<"Map::setNodeTimer(): Block not found"
1139                                 <<std::endl;
1140                 return;
1141         }
1142         NodeTimer nt(t.timeout, t.elapsed, p_rel);
1143         block->m_node_timers.set(nt);
1144 }
1145
1146 void Map::removeNodeTimer(v3s16 p)
1147 {
1148         v3s16 blockpos = getNodeBlockPos(p);
1149         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
1150         MapBlock *block = getBlockNoCreateNoEx(blockpos);
1151         if(block == NULL)
1152         {
1153                 warningstream<<"Map::removeNodeTimer(): Block not found"
1154                                 <<std::endl;
1155                 return;
1156         }
1157         block->m_node_timers.remove(p_rel);
1158 }
1159
1160 bool Map::isOccluded(v3s16 p0, v3s16 p1, float step, float stepfac,
1161                 float start_off, float end_off, u32 needed_count)
1162 {
1163         float d0 = (float)BS * p0.getDistanceFrom(p1);
1164         v3s16 u0 = p1 - p0;
1165         v3f uf = v3f(u0.X, u0.Y, u0.Z) * BS;
1166         uf.normalize();
1167         v3f p0f = v3f(p0.X, p0.Y, p0.Z) * BS;
1168         u32 count = 0;
1169         for(float s=start_off; s<d0+end_off; s+=step){
1170                 v3f pf = p0f + uf * s;
1171                 v3s16 p = floatToInt(pf, BS);
1172                 MapNode n = getNodeNoEx(p);
1173                 const ContentFeatures &f = m_nodedef->get(n);
1174                 if(f.drawtype == NDT_NORMAL){
1175                         // not transparent, see ContentFeature::updateTextures
1176                         count++;
1177                         if(count >= needed_count)
1178                                 return true;
1179                 }
1180                 step *= stepfac;
1181         }
1182         return false;
1183 }
1184
1185 bool Map::isBlockOccluded(MapBlock *block, v3s16 cam_pos_nodes) {
1186         v3s16 cpn = block->getPos() * MAP_BLOCKSIZE;
1187         cpn += v3s16(MAP_BLOCKSIZE / 2, MAP_BLOCKSIZE / 2, MAP_BLOCKSIZE / 2);
1188         float step = BS * 1;
1189         float stepfac = 1.1;
1190         float startoff = BS * 1;
1191         // The occlusion search of 'isOccluded()' must stop short of the target
1192         // point by distance 'endoff' (end offset) to not enter the target mapblock.
1193         // For the 8 mapblock corners 'endoff' must therefore be the maximum diagonal
1194         // of a mapblock, because we must consider all view angles.
1195         // sqrt(1^2 + 1^2 + 1^2) = 1.732
1196         float endoff = -BS * MAP_BLOCKSIZE * 1.732050807569;
1197         v3s16 spn = cam_pos_nodes;
1198         s16 bs2 = MAP_BLOCKSIZE / 2 + 1;
1199         // to reduce the likelihood of falsely occluded blocks
1200         // require at least two solid blocks
1201         // this is a HACK, we should think of a more precise algorithm
1202         u32 needed_count = 2;
1203
1204         return (
1205                 // For the central point of the mapblock 'endoff' can be halved
1206                 isOccluded(spn, cpn,
1207                         step, stepfac, startoff, endoff / 2.0f, needed_count) &&
1208                 isOccluded(spn, cpn + v3s16(bs2,bs2,bs2),
1209                         step, stepfac, startoff, endoff, needed_count) &&
1210                 isOccluded(spn, cpn + v3s16(bs2,bs2,-bs2),
1211                         step, stepfac, startoff, endoff, needed_count) &&
1212                 isOccluded(spn, cpn + v3s16(bs2,-bs2,bs2),
1213                         step, stepfac, startoff, endoff, needed_count) &&
1214                 isOccluded(spn, cpn + v3s16(bs2,-bs2,-bs2),
1215                         step, stepfac, startoff, endoff, needed_count) &&
1216                 isOccluded(spn, cpn + v3s16(-bs2,bs2,bs2),
1217                         step, stepfac, startoff, endoff, needed_count) &&
1218                 isOccluded(spn, cpn + v3s16(-bs2,bs2,-bs2),
1219                         step, stepfac, startoff, endoff, needed_count) &&
1220                 isOccluded(spn, cpn + v3s16(-bs2,-bs2,bs2),
1221                         step, stepfac, startoff, endoff, needed_count) &&
1222                 isOccluded(spn, cpn + v3s16(-bs2,-bs2,-bs2),
1223                         step, stepfac, startoff, endoff, needed_count));
1224 }
1225
1226 /*
1227         ServerMap
1228 */
1229 ServerMap::ServerMap(std::string savedir, IGameDef *gamedef, EmergeManager *emerge):
1230         Map(dout_server, gamedef),
1231         settings_mgr(g_settings, savedir + DIR_DELIM + "map_meta.txt"),
1232         m_emerge(emerge),
1233         m_map_metadata_changed(true)
1234 {
1235         verbosestream<<FUNCTION_NAME<<std::endl;
1236
1237         // Tell the EmergeManager about our MapSettingsManager
1238         emerge->map_settings_mgr = &settings_mgr;
1239
1240         /*
1241                 Try to load map; if not found, create a new one.
1242         */
1243
1244         // Determine which database backend to use
1245         std::string conf_path = savedir + DIR_DELIM + "world.mt";
1246         Settings conf;
1247         bool succeeded = conf.readConfigFile(conf_path.c_str());
1248         if (!succeeded || !conf.exists("backend")) {
1249                 // fall back to sqlite3
1250                 conf.set("backend", "sqlite3");
1251         }
1252         std::string backend = conf.get("backend");
1253         dbase = createDatabase(backend, savedir, conf);
1254
1255         if (!conf.updateConfigFile(conf_path.c_str()))
1256                 errorstream << "ServerMap::ServerMap(): Failed to update world.mt!" << std::endl;
1257
1258         m_savedir = savedir;
1259         m_map_saving_enabled = false;
1260
1261         try
1262         {
1263                 // If directory exists, check contents and load if possible
1264                 if(fs::PathExists(m_savedir))
1265                 {
1266                         // If directory is empty, it is safe to save into it.
1267                         if(fs::GetDirListing(m_savedir).size() == 0)
1268                         {
1269                                 infostream<<"ServerMap: Empty save directory is valid."
1270                                                 <<std::endl;
1271                                 m_map_saving_enabled = true;
1272                         }
1273                         else
1274                         {
1275
1276                                 if (settings_mgr.loadMapMeta()) {
1277                                         infostream << "ServerMap: Metadata loaded from "
1278                                                 << savedir << std::endl;
1279                                 } else {
1280                                         infostream << "ServerMap: Metadata could not be loaded "
1281                                                 "from " << savedir << ", assuming valid save "
1282                                                 "directory." << std::endl;
1283                                 }
1284
1285                                 m_map_saving_enabled = true;
1286                                 // Map loaded, not creating new one
1287                                 return;
1288                         }
1289                 }
1290                 // If directory doesn't exist, it is safe to save to it
1291                 else{
1292                         m_map_saving_enabled = true;
1293                 }
1294         }
1295         catch(std::exception &e)
1296         {
1297                 warningstream<<"ServerMap: Failed to load map from "<<savedir
1298                                 <<", exception: "<<e.what()<<std::endl;
1299                 infostream<<"Please remove the map or fix it."<<std::endl;
1300                 warningstream<<"Map saving will be disabled."<<std::endl;
1301         }
1302
1303         infostream<<"Initializing new map."<<std::endl;
1304
1305         // Create zero sector
1306         emergeSector(v2s16(0,0));
1307
1308         // Initially write whole map
1309         save(MOD_STATE_CLEAN);
1310 }
1311
1312 ServerMap::~ServerMap()
1313 {
1314         verbosestream<<FUNCTION_NAME<<std::endl;
1315
1316         try
1317         {
1318                 if(m_map_saving_enabled)
1319                 {
1320                         // Save only changed parts
1321                         save(MOD_STATE_WRITE_AT_UNLOAD);
1322                         infostream<<"ServerMap: Saved map to "<<m_savedir<<std::endl;
1323                 }
1324                 else
1325                 {
1326                         infostream<<"ServerMap: Map not saved"<<std::endl;
1327                 }
1328         }
1329         catch(std::exception &e)
1330         {
1331                 infostream<<"ServerMap: Failed to save map to "<<m_savedir
1332                                 <<", exception: "<<e.what()<<std::endl;
1333         }
1334
1335         /*
1336                 Close database if it was opened
1337         */
1338         delete dbase;
1339
1340 #if 0
1341         /*
1342                 Free all MapChunks
1343         */
1344         core::map<v2s16, MapChunk*>::Iterator i = m_chunks.getIterator();
1345         for(; i.atEnd() == false; i++)
1346         {
1347                 MapChunk *chunk = i.getNode()->getValue();
1348                 delete chunk;
1349         }
1350 #endif
1351 }
1352
1353 MapgenParams *ServerMap::getMapgenParams()
1354 {
1355         // getMapgenParams() should only ever be called after Server is initialized
1356         assert(settings_mgr.mapgen_params != NULL);
1357         return settings_mgr.mapgen_params;
1358 }
1359
1360 u64 ServerMap::getSeed()
1361 {
1362         return getMapgenParams()->seed;
1363 }
1364
1365 s16 ServerMap::getWaterLevel()
1366 {
1367         return getMapgenParams()->water_level;
1368 }
1369
1370 bool ServerMap::initBlockMake(v3s16 blockpos, BlockMakeData *data)
1371 {
1372         s16 csize = getMapgenParams()->chunksize;
1373         v3s16 bpmin = EmergeManager::getContainingChunk(blockpos, csize);
1374         v3s16 bpmax = bpmin + v3s16(1, 1, 1) * (csize - 1);
1375
1376         bool enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
1377         EMERGE_DBG_OUT("initBlockMake(): " PP(bpmin) " - " PP(bpmax));
1378
1379         v3s16 extra_borders(1, 1, 1);
1380         v3s16 full_bpmin = bpmin - extra_borders;
1381         v3s16 full_bpmax = bpmax + extra_borders;
1382
1383         // Do nothing if not inside mapgen limits (+-1 because of neighbors)
1384         if (blockpos_over_mapgen_limit(full_bpmin) ||
1385                         blockpos_over_mapgen_limit(full_bpmax))
1386                 return false;
1387
1388         data->seed = getSeed();
1389         data->blockpos_min = bpmin;
1390         data->blockpos_max = bpmax;
1391         data->blockpos_requested = blockpos;
1392         data->nodedef = m_nodedef;
1393
1394         /*
1395                 Create the whole area of this and the neighboring blocks
1396         */
1397         for (s16 x = full_bpmin.X; x <= full_bpmax.X; x++)
1398         for (s16 z = full_bpmin.Z; z <= full_bpmax.Z; z++) {
1399                 v2s16 sectorpos(x, z);
1400                 // Sector metadata is loaded from disk if not already loaded.
1401                 ServerMapSector *sector = createSector(sectorpos);
1402                 FATAL_ERROR_IF(sector == NULL, "createSector() failed");
1403
1404                 for (s16 y = full_bpmin.Y; y <= full_bpmax.Y; y++) {
1405                         v3s16 p(x, y, z);
1406
1407                         MapBlock *block = emergeBlock(p, false);
1408                         if (block == NULL) {
1409                                 block = createBlock(p);
1410
1411                                 // Block gets sunlight if this is true.
1412                                 // Refer to the map generator heuristics.
1413                                 bool ug = m_emerge->isBlockUnderground(p);
1414                                 block->setIsUnderground(ug);
1415                         }
1416                 }
1417         }
1418
1419         /*
1420                 Now we have a big empty area.
1421
1422                 Make a ManualMapVoxelManipulator that contains this and the
1423                 neighboring blocks
1424         */
1425
1426         data->vmanip = new MMVManip(this);
1427         data->vmanip->initialEmerge(full_bpmin, full_bpmax);
1428
1429         // Note: we may need this again at some point.
1430 #if 0
1431         // Ensure none of the blocks to be generated were marked as
1432         // containing CONTENT_IGNORE
1433         for (s16 z = blockpos_min.Z; z <= blockpos_max.Z; z++) {
1434                 for (s16 y = blockpos_min.Y; y <= blockpos_max.Y; y++) {
1435                         for (s16 x = blockpos_min.X; x <= blockpos_max.X; x++) {
1436                                 core::map<v3s16, u8>::Node *n;
1437                                 n = data->vmanip->m_loaded_blocks.find(v3s16(x, y, z));
1438                                 if (n == NULL)
1439                                         continue;
1440                                 u8 flags = n->getValue();
1441                                 flags &= ~VMANIP_BLOCK_CONTAINS_CIGNORE;
1442                                 n->setValue(flags);
1443                         }
1444                 }
1445         }
1446 #endif
1447
1448         // Data is ready now.
1449         return true;
1450 }
1451
1452 void ServerMap::finishBlockMake(BlockMakeData *data,
1453         std::map<v3s16, MapBlock*> *changed_blocks)
1454 {
1455         v3s16 bpmin = data->blockpos_min;
1456         v3s16 bpmax = data->blockpos_max;
1457
1458         v3s16 extra_borders(1, 1, 1);
1459
1460         bool enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
1461         EMERGE_DBG_OUT("finishBlockMake(): " PP(bpmin) " - " PP(bpmax));
1462
1463         /*
1464                 Blit generated stuff to map
1465                 NOTE: blitBackAll adds nearly everything to changed_blocks
1466         */
1467         data->vmanip->blitBackAll(changed_blocks);
1468
1469         EMERGE_DBG_OUT("finishBlockMake: changed_blocks.size()="
1470                 << changed_blocks->size());
1471
1472         /*
1473                 Copy transforming liquid information
1474         */
1475         while (data->transforming_liquid.size()) {
1476                 m_transforming_liquid.push_back(data->transforming_liquid.front());
1477                 data->transforming_liquid.pop_front();
1478         }
1479
1480         for (std::map<v3s16, MapBlock *>::iterator
1481                         it = changed_blocks->begin();
1482                         it != changed_blocks->end(); ++it) {
1483                 MapBlock *block = it->second;
1484                 if (!block)
1485                         continue;
1486                 /*
1487                         Update day/night difference cache of the MapBlocks
1488                 */
1489                 block->expireDayNightDiff();
1490                 /*
1491                         Set block as modified
1492                 */
1493                 block->raiseModified(MOD_STATE_WRITE_NEEDED,
1494                         MOD_REASON_EXPIRE_DAYNIGHTDIFF);
1495         }
1496
1497         /*
1498                 Set central blocks as generated
1499         */
1500         for (s16 x = bpmin.X; x <= bpmax.X; x++)
1501         for (s16 z = bpmin.Z; z <= bpmax.Z; z++)
1502         for (s16 y = bpmin.Y; y <= bpmax.Y; y++) {
1503                 MapBlock *block = getBlockNoCreateNoEx(v3s16(x, y, z));
1504                 if (!block)
1505                         continue;
1506
1507                 block->setGenerated(true);
1508         }
1509
1510         /*
1511                 Save changed parts of map
1512                 NOTE: Will be saved later.
1513         */
1514         //save(MOD_STATE_WRITE_AT_UNLOAD);
1515 }
1516
1517 ServerMapSector *ServerMap::createSector(v2s16 p2d)
1518 {
1519         DSTACKF("%s: p2d=(%d,%d)",
1520                         FUNCTION_NAME,
1521                         p2d.X, p2d.Y);
1522
1523         /*
1524                 Check if it exists already in memory
1525         */
1526         ServerMapSector *sector = (ServerMapSector*)getSectorNoGenerateNoEx(p2d);
1527         if(sector != NULL)
1528                 return sector;
1529
1530         /*
1531                 Try to load it from disk (with blocks)
1532         */
1533         //if(loadSectorFull(p2d) == true)
1534
1535         /*
1536                 Try to load metadata from disk
1537         */
1538 #if 0
1539         if(loadSectorMeta(p2d) == true)
1540         {
1541                 ServerMapSector *sector = (ServerMapSector*)getSectorNoGenerateNoEx(p2d);
1542                 if(sector == NULL)
1543                 {
1544                         infostream<<"ServerMap::createSector(): loadSectorFull didn't make a sector"<<std::endl;
1545                         throw InvalidPositionException("");
1546                 }
1547                 return sector;
1548         }
1549 #endif
1550
1551         /*
1552                 Do not create over max mapgen limit
1553         */
1554         const s16 max_limit_bp = MAX_MAP_GENERATION_LIMIT / MAP_BLOCKSIZE;
1555         if (p2d.X < -max_limit_bp ||
1556                         p2d.X >  max_limit_bp ||
1557                         p2d.Y < -max_limit_bp ||
1558                         p2d.Y >  max_limit_bp)
1559                 throw InvalidPositionException("createSector(): pos. over max mapgen limit");
1560
1561         /*
1562                 Generate blank sector
1563         */
1564
1565         sector = new ServerMapSector(this, p2d, m_gamedef);
1566
1567         // Sector position on map in nodes
1568         //v2s16 nodepos2d = p2d * MAP_BLOCKSIZE;
1569
1570         /*
1571                 Insert to container
1572         */
1573         m_sectors[p2d] = sector;
1574
1575         return sector;
1576 }
1577
1578 #if 0
1579 /*
1580         This is a quick-hand function for calling makeBlock().
1581 */
1582 MapBlock * ServerMap::generateBlock(
1583                 v3s16 p,
1584                 std::map<v3s16, MapBlock*> &modified_blocks
1585 )
1586 {
1587         DSTACKF("%s: p=(%d,%d,%d)", FUNCTION_NAME, p.X, p.Y, p.Z);
1588
1589         /*infostream<<"generateBlock(): "
1590                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
1591                         <<std::endl;*/
1592
1593         bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
1594
1595         TimeTaker timer("generateBlock");
1596
1597         //MapBlock *block = original_dummy;
1598
1599         v2s16 p2d(p.X, p.Z);
1600         v2s16 p2d_nodes = p2d * MAP_BLOCKSIZE;
1601
1602         /*
1603                 Do not generate over-limit
1604         */
1605         if(blockpos_over_limit(p))
1606         {
1607                 infostream<<FUNCTION_NAME<<": Block position over limit"<<std::endl;
1608                 throw InvalidPositionException("generateBlock(): pos. over limit");
1609         }
1610
1611         /*
1612                 Create block make data
1613         */
1614         BlockMakeData data;
1615         initBlockMake(&data, p);
1616
1617         /*
1618                 Generate block
1619         */
1620         {
1621                 TimeTaker t("mapgen::make_block()");
1622                 mapgen->makeChunk(&data);
1623                 //mapgen::make_block(&data);
1624
1625                 if(enable_mapgen_debug_info == false)
1626                         t.stop(true); // Hide output
1627         }
1628
1629         /*
1630                 Blit data back on map, update lighting, add mobs and whatever this does
1631         */
1632         finishBlockMake(&data, modified_blocks);
1633
1634         /*
1635                 Get central block
1636         */
1637         MapBlock *block = getBlockNoCreateNoEx(p);
1638
1639 #if 0
1640         /*
1641                 Check result
1642         */
1643         if(block)
1644         {
1645                 bool erroneus_content = false;
1646                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
1647                 for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
1648                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
1649                 {
1650                         v3s16 p(x0,y0,z0);
1651                         MapNode n = block->getNode(p);
1652                         if(n.getContent() == CONTENT_IGNORE)
1653                         {
1654                                 infostream<<"CONTENT_IGNORE at "
1655                                                 <<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
1656                                                 <<std::endl;
1657                                 erroneus_content = true;
1658                                 assert(0);
1659                         }
1660                 }
1661                 if(erroneus_content)
1662                 {
1663                         assert(0);
1664                 }
1665         }
1666 #endif
1667
1668 #if 0
1669         /*
1670                 Generate a completely empty block
1671         */
1672         if(block)
1673         {
1674                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
1675                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
1676                 {
1677                         for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
1678                         {
1679                                 MapNode n;
1680                                 n.setContent(CONTENT_AIR);
1681                                 block->setNode(v3s16(x0,y0,z0), n);
1682                         }
1683                 }
1684         }
1685 #endif
1686
1687         if(enable_mapgen_debug_info == false)
1688                 timer.stop(true); // Hide output
1689
1690         return block;
1691 }
1692 #endif
1693
1694 MapBlock * ServerMap::createBlock(v3s16 p)
1695 {
1696         DSTACKF("%s: p=(%d,%d,%d)",
1697                         FUNCTION_NAME, p.X, p.Y, p.Z);
1698
1699         /*
1700                 Do not create over max mapgen limit
1701         */
1702         if (blockpos_over_max_limit(p))
1703                 throw InvalidPositionException("createBlock(): pos. over max mapgen limit");
1704
1705         v2s16 p2d(p.X, p.Z);
1706         s16 block_y = p.Y;
1707         /*
1708                 This will create or load a sector if not found in memory.
1709                 If block exists on disk, it will be loaded.
1710
1711                 NOTE: On old save formats, this will be slow, as it generates
1712                       lighting on blocks for them.
1713         */
1714         ServerMapSector *sector;
1715         try {
1716                 sector = (ServerMapSector*)createSector(p2d);
1717                 assert(sector->getId() == MAPSECTOR_SERVER);
1718         }
1719         catch(InvalidPositionException &e)
1720         {
1721                 infostream<<"createBlock: createSector() failed"<<std::endl;
1722                 throw e;
1723         }
1724         /*
1725                 NOTE: This should not be done, or at least the exception
1726                 should not be passed on as std::exception, because it
1727                 won't be catched at all.
1728         */
1729         /*catch(std::exception &e)
1730         {
1731                 infostream<<"createBlock: createSector() failed: "
1732                                 <<e.what()<<std::endl;
1733                 throw e;
1734         }*/
1735
1736         /*
1737                 Try to get a block from the sector
1738         */
1739
1740         MapBlock *block = sector->getBlockNoCreateNoEx(block_y);
1741         if(block)
1742         {
1743                 if(block->isDummy())
1744                         block->unDummify();
1745                 return block;
1746         }
1747         // Create blank
1748         block = sector->createBlankBlock(block_y);
1749
1750         return block;
1751 }
1752
1753 MapBlock * ServerMap::emergeBlock(v3s16 p, bool create_blank)
1754 {
1755         DSTACKF("%s: p=(%d,%d,%d), create_blank=%d",
1756                         FUNCTION_NAME,
1757                         p.X, p.Y, p.Z, create_blank);
1758
1759         {
1760                 MapBlock *block = getBlockNoCreateNoEx(p);
1761                 if(block && block->isDummy() == false)
1762                         return block;
1763         }
1764
1765         {
1766                 MapBlock *block = loadBlock(p);
1767                 if(block)
1768                         return block;
1769         }
1770
1771         if (create_blank) {
1772                 ServerMapSector *sector = createSector(v2s16(p.X, p.Z));
1773                 MapBlock *block = sector->createBlankBlock(p.Y);
1774
1775                 return block;
1776         }
1777
1778 #if 0
1779         if(allow_generate)
1780         {
1781                 std::map<v3s16, MapBlock*> modified_blocks;
1782                 MapBlock *block = generateBlock(p, modified_blocks);
1783                 if(block)
1784                 {
1785                         MapEditEvent event;
1786                         event.type = MEET_OTHER;
1787                         event.p = p;
1788
1789                         // Copy modified_blocks to event
1790                         for(std::map<v3s16, MapBlock*>::iterator
1791                                         i = modified_blocks.begin();
1792                                         i != modified_blocks.end(); ++i)
1793                         {
1794                                 event.modified_blocks.insert(i->first);
1795                         }
1796
1797                         // Queue event
1798                         dispatchEvent(&event);
1799
1800                         return block;
1801                 }
1802         }
1803 #endif
1804
1805         return NULL;
1806 }
1807
1808 MapBlock *ServerMap::getBlockOrEmerge(v3s16 p3d)
1809 {
1810         MapBlock *block = getBlockNoCreateNoEx(p3d);
1811         if (block == NULL)
1812                 m_emerge->enqueueBlockEmerge(PEER_ID_INEXISTENT, p3d, false);
1813
1814         return block;
1815 }
1816
1817 void ServerMap::prepareBlock(MapBlock *block) {
1818 }
1819
1820 // N.B.  This requires no synchronization, since data will not be modified unless
1821 // the VoxelManipulator being updated belongs to the same thread.
1822 void ServerMap::updateVManip(v3s16 pos)
1823 {
1824         Mapgen *mg = m_emerge->getCurrentMapgen();
1825         if (!mg)
1826                 return;
1827
1828         MMVManip *vm = mg->vm;
1829         if (!vm)
1830                 return;
1831
1832         if (!vm->m_area.contains(pos))
1833                 return;
1834
1835         s32 idx = vm->m_area.index(pos);
1836         vm->m_data[idx] = getNodeNoEx(pos);
1837         vm->m_flags[idx] &= ~VOXELFLAG_NO_DATA;
1838
1839         vm->m_is_dirty = true;
1840 }
1841
1842 s16 ServerMap::findGroundLevel(v2s16 p2d)
1843 {
1844 #if 0
1845         /*
1846                 Uh, just do something random...
1847         */
1848         // Find existing map from top to down
1849         s16 max=63;
1850         s16 min=-64;
1851         v3s16 p(p2d.X, max, p2d.Y);
1852         for(; p.Y>min; p.Y--)
1853         {
1854                 MapNode n = getNodeNoEx(p);
1855                 if(n.getContent() != CONTENT_IGNORE)
1856                         break;
1857         }
1858         if(p.Y == min)
1859                 goto plan_b;
1860         // If this node is not air, go to plan b
1861         if(getNodeNoEx(p).getContent() != CONTENT_AIR)
1862                 goto plan_b;
1863         // Search existing walkable and return it
1864         for(; p.Y>min; p.Y--)
1865         {
1866                 MapNode n = getNodeNoEx(p);
1867                 if(content_walkable(n.d) && n.getContent() != CONTENT_IGNORE)
1868                         return p.Y;
1869         }
1870
1871         // Move to plan b
1872 plan_b:
1873 #endif
1874
1875         /*
1876                 Determine from map generator noise functions
1877         */
1878
1879         s16 level = m_emerge->getGroundLevelAtPoint(p2d);
1880         return level;
1881
1882         //double level = base_rock_level_2d(m_seed, p2d) + AVERAGE_MUD_AMOUNT;
1883         //return (s16)level;
1884 }
1885
1886 bool ServerMap::loadFromFolders() {
1887         if (!dbase->initialized() &&
1888                         !fs::PathExists(m_savedir + DIR_DELIM + "map.sqlite"))
1889                 return true;
1890         return false;
1891 }
1892
1893 void ServerMap::createDirs(std::string path)
1894 {
1895         if(fs::CreateAllDirs(path) == false)
1896         {
1897                 m_dout<<"ServerMap: Failed to create directory "
1898                                 <<"\""<<path<<"\""<<std::endl;
1899                 throw BaseException("ServerMap failed to create directory");
1900         }
1901 }
1902
1903 std::string ServerMap::getSectorDir(v2s16 pos, int layout)
1904 {
1905         char cc[9];
1906         switch(layout)
1907         {
1908                 case 1:
1909                         snprintf(cc, 9, "%.4x%.4x",
1910                                 (unsigned int) pos.X & 0xffff,
1911                                 (unsigned int) pos.Y & 0xffff);
1912
1913                         return m_savedir + DIR_DELIM + "sectors" + DIR_DELIM + cc;
1914                 case 2:
1915                         snprintf(cc, 9, (std::string("%.3x") + DIR_DELIM + "%.3x").c_str(),
1916                                 (unsigned int) pos.X & 0xfff,
1917                                 (unsigned int) pos.Y & 0xfff);
1918
1919                         return m_savedir + DIR_DELIM + "sectors2" + DIR_DELIM + cc;
1920                 default:
1921                         assert(false);
1922                         return "";
1923         }
1924 }
1925
1926 v2s16 ServerMap::getSectorPos(std::string dirname)
1927 {
1928         unsigned int x = 0, y = 0;
1929         int r;
1930         std::string component;
1931         fs::RemoveLastPathComponent(dirname, &component, 1);
1932         if(component.size() == 8)
1933         {
1934                 // Old layout
1935                 r = sscanf(component.c_str(), "%4x%4x", &x, &y);
1936         }
1937         else if(component.size() == 3)
1938         {
1939                 // New layout
1940                 fs::RemoveLastPathComponent(dirname, &component, 2);
1941                 r = sscanf(component.c_str(), (std::string("%3x") + DIR_DELIM + "%3x").c_str(), &x, &y);
1942                 // Sign-extend the 12 bit values up to 16 bits...
1943                 if(x & 0x800) x |= 0xF000;
1944                 if(y & 0x800) y |= 0xF000;
1945         }
1946         else
1947         {
1948                 r = -1;
1949         }
1950
1951         FATAL_ERROR_IF(r != 2, "getSectorPos()");
1952         v2s16 pos((s16)x, (s16)y);
1953         return pos;
1954 }
1955
1956 v3s16 ServerMap::getBlockPos(std::string sectordir, std::string blockfile)
1957 {
1958         v2s16 p2d = getSectorPos(sectordir);
1959
1960         if(blockfile.size() != 4){
1961                 throw InvalidFilenameException("Invalid block filename");
1962         }
1963         unsigned int y;
1964         int r = sscanf(blockfile.c_str(), "%4x", &y);
1965         if(r != 1)
1966                 throw InvalidFilenameException("Invalid block filename");
1967         return v3s16(p2d.X, y, p2d.Y);
1968 }
1969
1970 std::string ServerMap::getBlockFilename(v3s16 p)
1971 {
1972         char cc[5];
1973         snprintf(cc, 5, "%.4x", (unsigned int)p.Y&0xffff);
1974         return cc;
1975 }
1976
1977 void ServerMap::save(ModifiedState save_level)
1978 {
1979         DSTACK(FUNCTION_NAME);
1980         if(m_map_saving_enabled == false) {
1981                 warningstream<<"Not saving map, saving disabled."<<std::endl;
1982                 return;
1983         }
1984
1985         if(save_level == MOD_STATE_CLEAN)
1986                 infostream<<"ServerMap: Saving whole map, this can take time."
1987                                 <<std::endl;
1988
1989         if (m_map_metadata_changed || save_level == MOD_STATE_CLEAN) {
1990                 if (settings_mgr.saveMapMeta())
1991                         m_map_metadata_changed = false;
1992         }
1993
1994         // Profile modified reasons
1995         Profiler modprofiler;
1996
1997         u32 sector_meta_count = 0;
1998         u32 block_count = 0;
1999         u32 block_count_all = 0; // Number of blocks in memory
2000
2001         // Don't do anything with sqlite unless something is really saved
2002         bool save_started = false;
2003
2004         for(std::map<v2s16, MapSector*>::iterator i = m_sectors.begin();
2005                 i != m_sectors.end(); ++i) {
2006                 ServerMapSector *sector = (ServerMapSector*)i->second;
2007                 assert(sector->getId() == MAPSECTOR_SERVER);
2008
2009                 if(sector->differs_from_disk || save_level == MOD_STATE_CLEAN) {
2010                         saveSectorMeta(sector);
2011                         sector_meta_count++;
2012                 }
2013
2014                 MapBlockVect blocks;
2015                 sector->getBlocks(blocks);
2016
2017                 for(MapBlockVect::iterator j = blocks.begin();
2018                         j != blocks.end(); ++j) {
2019                         MapBlock *block = *j;
2020
2021                         block_count_all++;
2022
2023                         if(block->getModified() >= (u32)save_level) {
2024                                 // Lazy beginSave()
2025                                 if(!save_started) {
2026                                         beginSave();
2027                                         save_started = true;
2028                                 }
2029
2030                                 modprofiler.add(block->getModifiedReasonString(), 1);
2031
2032                                 saveBlock(block);
2033                                 block_count++;
2034
2035                                 /*infostream<<"ServerMap: Written block ("
2036                                                 <<block->getPos().X<<","
2037                                                 <<block->getPos().Y<<","
2038                                                 <<block->getPos().Z<<")"
2039                                                 <<std::endl;*/
2040                         }
2041                 }
2042         }
2043
2044         if(save_started)
2045                 endSave();
2046
2047         /*
2048                 Only print if something happened or saved whole map
2049         */
2050         if(save_level == MOD_STATE_CLEAN || sector_meta_count != 0
2051                         || block_count != 0) {
2052                 infostream<<"ServerMap: Written: "
2053                                 <<sector_meta_count<<" sector metadata files, "
2054                                 <<block_count<<" block files"
2055                                 <<", "<<block_count_all<<" blocks in memory."
2056                                 <<std::endl;
2057                 PrintInfo(infostream); // ServerMap/ClientMap:
2058                 infostream<<"Blocks modified by: "<<std::endl;
2059                 modprofiler.print(infostream);
2060         }
2061 }
2062
2063 void ServerMap::listAllLoadableBlocks(std::vector<v3s16> &dst)
2064 {
2065         if (loadFromFolders()) {
2066                 errorstream << "Map::listAllLoadableBlocks(): Result will be missing "
2067                                 << "all blocks that are stored in flat files." << std::endl;
2068         }
2069         dbase->listAllLoadableBlocks(dst);
2070 }
2071
2072 void ServerMap::listAllLoadedBlocks(std::vector<v3s16> &dst)
2073 {
2074         for(std::map<v2s16, MapSector*>::iterator si = m_sectors.begin();
2075                 si != m_sectors.end(); ++si)
2076         {
2077                 MapSector *sector = si->second;
2078
2079                 MapBlockVect blocks;
2080                 sector->getBlocks(blocks);
2081
2082                 for(MapBlockVect::iterator i = blocks.begin();
2083                                 i != blocks.end(); ++i) {
2084                         v3s16 p = (*i)->getPos();
2085                         dst.push_back(p);
2086                 }
2087         }
2088 }
2089
2090 void ServerMap::saveSectorMeta(ServerMapSector *sector)
2091 {
2092         DSTACK(FUNCTION_NAME);
2093         // Format used for writing
2094         u8 version = SER_FMT_VER_HIGHEST_WRITE;
2095         // Get destination
2096         v2s16 pos = sector->getPos();
2097         std::string dir = getSectorDir(pos);
2098         createDirs(dir);
2099
2100         std::string fullpath = dir + DIR_DELIM + "meta";
2101         std::ostringstream ss(std::ios_base::binary);
2102
2103         sector->serialize(ss, version);
2104
2105         if(!fs::safeWriteToFile(fullpath, ss.str()))
2106                 throw FileNotGoodException("Cannot write sector metafile");
2107
2108         sector->differs_from_disk = false;
2109 }
2110
2111 MapSector* ServerMap::loadSectorMeta(std::string sectordir, bool save_after_load)
2112 {
2113         DSTACK(FUNCTION_NAME);
2114         // Get destination
2115         v2s16 p2d = getSectorPos(sectordir);
2116
2117         ServerMapSector *sector = NULL;
2118
2119         std::string fullpath = sectordir + DIR_DELIM + "meta";
2120         std::ifstream is(fullpath.c_str(), std::ios_base::binary);
2121         if(is.good() == false)
2122         {
2123                 // If the directory exists anyway, it probably is in some old
2124                 // format. Just go ahead and create the sector.
2125                 if(fs::PathExists(sectordir))
2126                 {
2127                         /*infostream<<"ServerMap::loadSectorMeta(): Sector metafile "
2128                                         <<fullpath<<" doesn't exist but directory does."
2129                                         <<" Continuing with a sector with no metadata."
2130                                         <<std::endl;*/
2131                         sector = new ServerMapSector(this, p2d, m_gamedef);
2132                         m_sectors[p2d] = sector;
2133                 }
2134                 else
2135                 {
2136                         throw FileNotGoodException("Cannot open sector metafile");
2137                 }
2138         }
2139         else
2140         {
2141                 sector = ServerMapSector::deSerialize
2142                                 (is, this, p2d, m_sectors, m_gamedef);
2143                 if(save_after_load)
2144                         saveSectorMeta(sector);
2145         }
2146
2147         sector->differs_from_disk = false;
2148
2149         return sector;
2150 }
2151
2152 bool ServerMap::loadSectorMeta(v2s16 p2d)
2153 {
2154         DSTACK(FUNCTION_NAME);
2155
2156         // The directory layout we're going to load from.
2157         //  1 - original sectors/xxxxzzzz/
2158         //  2 - new sectors2/xxx/zzz/
2159         //  If we load from anything but the latest structure, we will
2160         //  immediately save to the new one, and remove the old.
2161         int loadlayout = 1;
2162         std::string sectordir1 = getSectorDir(p2d, 1);
2163         std::string sectordir;
2164         if(fs::PathExists(sectordir1))
2165         {
2166                 sectordir = sectordir1;
2167         }
2168         else
2169         {
2170                 loadlayout = 2;
2171                 sectordir = getSectorDir(p2d, 2);
2172         }
2173
2174         try{
2175                 loadSectorMeta(sectordir, loadlayout != 2);
2176         }
2177         catch(InvalidFilenameException &e)
2178         {
2179                 return false;
2180         }
2181         catch(FileNotGoodException &e)
2182         {
2183                 return false;
2184         }
2185         catch(std::exception &e)
2186         {
2187                 return false;
2188         }
2189
2190         return true;
2191 }
2192
2193 #if 0
2194 bool ServerMap::loadSectorFull(v2s16 p2d)
2195 {
2196         DSTACK(FUNCTION_NAME);
2197
2198         MapSector *sector = NULL;
2199
2200         // The directory layout we're going to load from.
2201         //  1 - original sectors/xxxxzzzz/
2202         //  2 - new sectors2/xxx/zzz/
2203         //  If we load from anything but the latest structure, we will
2204         //  immediately save to the new one, and remove the old.
2205         int loadlayout = 1;
2206         std::string sectordir1 = getSectorDir(p2d, 1);
2207         std::string sectordir;
2208         if(fs::PathExists(sectordir1))
2209         {
2210                 sectordir = sectordir1;
2211         }
2212         else
2213         {
2214                 loadlayout = 2;
2215                 sectordir = getSectorDir(p2d, 2);
2216         }
2217
2218         try{
2219                 sector = loadSectorMeta(sectordir, loadlayout != 2);
2220         }
2221         catch(InvalidFilenameException &e)
2222         {
2223                 return false;
2224         }
2225         catch(FileNotGoodException &e)
2226         {
2227                 return false;
2228         }
2229         catch(std::exception &e)
2230         {
2231                 return false;
2232         }
2233
2234         /*
2235                 Load blocks
2236         */
2237         std::vector<fs::DirListNode> list2 = fs::GetDirListing
2238                         (sectordir);
2239         std::vector<fs::DirListNode>::iterator i2;
2240         for(i2=list2.begin(); i2!=list2.end(); i2++)
2241         {
2242                 // We want files
2243                 if(i2->dir)
2244                         continue;
2245                 try{
2246                         loadBlock(sectordir, i2->name, sector, loadlayout != 2);
2247                 }
2248                 catch(InvalidFilenameException &e)
2249                 {
2250                         // This catches unknown crap in directory
2251                 }
2252         }
2253
2254         if(loadlayout != 2)
2255         {
2256                 infostream<<"Sector converted to new layout - deleting "<<
2257                         sectordir1<<std::endl;
2258                 fs::RecursiveDelete(sectordir1);
2259         }
2260
2261         return true;
2262 }
2263 #endif
2264
2265 Database *ServerMap::createDatabase(
2266         const std::string &name,
2267         const std::string &savedir,
2268         Settings &conf)
2269 {
2270         if (name == "sqlite3")
2271                 return new Database_SQLite3(savedir);
2272         if (name == "dummy")
2273                 return new Database_Dummy();
2274         #if USE_LEVELDB
2275         else if (name == "leveldb")
2276                 return new Database_LevelDB(savedir);
2277         #endif
2278         #if USE_REDIS
2279         else if (name == "redis")
2280                 return new Database_Redis(conf);
2281         #endif
2282         #if USE_POSTGRESQL
2283         else if (name == "postgresql")
2284                 return new Database_PostgreSQL(conf);
2285         #endif
2286         else
2287                 throw BaseException(std::string("Database backend ") + name + " not supported.");
2288 }
2289
2290 void ServerMap::beginSave()
2291 {
2292         dbase->beginSave();
2293 }
2294
2295 void ServerMap::endSave()
2296 {
2297         dbase->endSave();
2298 }
2299
2300 bool ServerMap::saveBlock(MapBlock *block)
2301 {
2302         return saveBlock(block, dbase);
2303 }
2304
2305 bool ServerMap::saveBlock(MapBlock *block, Database *db)
2306 {
2307         v3s16 p3d = block->getPos();
2308
2309         // Dummy blocks are not written
2310         if (block->isDummy()) {
2311                 warningstream << "saveBlock: Not writing dummy block "
2312                         << PP(p3d) << std::endl;
2313                 return true;
2314         }
2315
2316         // Format used for writing
2317         u8 version = SER_FMT_VER_HIGHEST_WRITE;
2318
2319         /*
2320                 [0] u8 serialization version
2321                 [1] data
2322         */
2323         std::ostringstream o(std::ios_base::binary);
2324         o.write((char*) &version, 1);
2325         block->serialize(o, version, true);
2326
2327         std::string data = o.str();
2328         bool ret = db->saveBlock(p3d, data);
2329         if (ret) {
2330                 // We just wrote it to the disk so clear modified flag
2331                 block->resetModified();
2332         }
2333         return ret;
2334 }
2335
2336 void ServerMap::loadBlock(std::string sectordir, std::string blockfile,
2337                 MapSector *sector, bool save_after_load)
2338 {
2339         DSTACK(FUNCTION_NAME);
2340
2341         std::string fullpath = sectordir + DIR_DELIM + blockfile;
2342         try {
2343
2344                 std::ifstream is(fullpath.c_str(), std::ios_base::binary);
2345                 if(is.good() == false)
2346                         throw FileNotGoodException("Cannot open block file");
2347
2348                 v3s16 p3d = getBlockPos(sectordir, blockfile);
2349                 v2s16 p2d(p3d.X, p3d.Z);
2350
2351                 assert(sector->getPos() == p2d);
2352
2353                 u8 version = SER_FMT_VER_INVALID;
2354                 is.read((char*)&version, 1);
2355
2356                 if(is.fail())
2357                         throw SerializationError("ServerMap::loadBlock(): Failed"
2358                                         " to read MapBlock version");
2359
2360                 /*u32 block_size = MapBlock::serializedLength(version);
2361                 SharedBuffer<u8> data(block_size);
2362                 is.read((char*)*data, block_size);*/
2363
2364                 // This will always return a sector because we're the server
2365                 //MapSector *sector = emergeSector(p2d);
2366
2367                 MapBlock *block = NULL;
2368                 bool created_new = false;
2369                 block = sector->getBlockNoCreateNoEx(p3d.Y);
2370                 if(block == NULL)
2371                 {
2372                         block = sector->createBlankBlockNoInsert(p3d.Y);
2373                         created_new = true;
2374                 }
2375
2376                 // Read basic data
2377                 block->deSerialize(is, version, true);
2378
2379                 // If it's a new block, insert it to the map
2380                 if (created_new) {
2381                         sector->insertBlock(block);
2382                         ReflowScan scanner(this, m_emerge->ndef);
2383                         scanner.scan(block, &m_transforming_liquid);
2384                 }
2385
2386                 /*
2387                         Save blocks loaded in old format in new format
2388                 */
2389
2390                 if(version < SER_FMT_VER_HIGHEST_WRITE || save_after_load)
2391                 {
2392                         saveBlock(block);
2393
2394                         // Should be in database now, so delete the old file
2395                         fs::RecursiveDelete(fullpath);
2396                 }
2397
2398                 // We just loaded it from the disk, so it's up-to-date.
2399                 block->resetModified();
2400
2401         }
2402         catch(SerializationError &e)
2403         {
2404                 warningstream<<"Invalid block data on disk "
2405                                 <<"fullpath="<<fullpath
2406                                 <<" (SerializationError). "
2407                                 <<"what()="<<e.what()
2408                                 <<std::endl;
2409                                 // Ignoring. A new one will be generated.
2410                 abort();
2411
2412                 // TODO: Backup file; name is in fullpath.
2413         }
2414 }
2415
2416 void ServerMap::loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool save_after_load)
2417 {
2418         DSTACK(FUNCTION_NAME);
2419
2420         try {
2421                 std::istringstream is(*blob, std::ios_base::binary);
2422
2423                 u8 version = SER_FMT_VER_INVALID;
2424                 is.read((char*)&version, 1);
2425
2426                 if(is.fail())
2427                         throw SerializationError("ServerMap::loadBlock(): Failed"
2428                                         " to read MapBlock version");
2429
2430                 MapBlock *block = NULL;
2431                 bool created_new = false;
2432                 block = sector->getBlockNoCreateNoEx(p3d.Y);
2433                 if(block == NULL)
2434                 {
2435                         block = sector->createBlankBlockNoInsert(p3d.Y);
2436                         created_new = true;
2437                 }
2438
2439                 // Read basic data
2440                 block->deSerialize(is, version, true);
2441
2442                 // If it's a new block, insert it to the map
2443                 if (created_new) {
2444                         sector->insertBlock(block);
2445                         ReflowScan scanner(this, m_emerge->ndef);
2446                         scanner.scan(block, &m_transforming_liquid);
2447                 }
2448
2449                 /*
2450                         Save blocks loaded in old format in new format
2451                 */
2452
2453                 //if(version < SER_FMT_VER_HIGHEST_READ || save_after_load)
2454                 // Only save if asked to; no need to update version
2455                 if(save_after_load)
2456                         saveBlock(block);
2457
2458                 // We just loaded it from, so it's up-to-date.
2459                 block->resetModified();
2460         }
2461         catch(SerializationError &e)
2462         {
2463                 errorstream<<"Invalid block data in database"
2464                                 <<" ("<<p3d.X<<","<<p3d.Y<<","<<p3d.Z<<")"
2465                                 <<" (SerializationError): "<<e.what()<<std::endl;
2466
2467                 // TODO: Block should be marked as invalid in memory so that it is
2468                 // not touched but the game can run
2469
2470                 if(g_settings->getBool("ignore_world_load_errors")){
2471                         errorstream<<"Ignoring block load error. Duck and cover! "
2472                                         <<"(ignore_world_load_errors)"<<std::endl;
2473                 } else {
2474                         throw SerializationError("Invalid block data in database");
2475                 }
2476         }
2477 }
2478
2479 MapBlock* ServerMap::loadBlock(v3s16 blockpos)
2480 {
2481         DSTACK(FUNCTION_NAME);
2482
2483         bool created_new = (getBlockNoCreateNoEx(blockpos) == NULL);
2484
2485         v2s16 p2d(blockpos.X, blockpos.Z);
2486
2487         std::string ret;
2488         dbase->loadBlock(blockpos, &ret);
2489         if (ret != "") {
2490                 loadBlock(&ret, blockpos, createSector(p2d), false);
2491         } else {
2492                 // Not found in database, try the files
2493
2494                 // The directory layout we're going to load from.
2495                 //  1 - original sectors/xxxxzzzz/
2496                 //  2 - new sectors2/xxx/zzz/
2497                 //  If we load from anything but the latest structure, we will
2498                 //  immediately save to the new one, and remove the old.
2499                 int loadlayout = 1;
2500                 std::string sectordir1 = getSectorDir(p2d, 1);
2501                 std::string sectordir;
2502                 if (fs::PathExists(sectordir1)) {
2503                         sectordir = sectordir1;
2504                 } else {
2505                         loadlayout = 2;
2506                         sectordir = getSectorDir(p2d, 2);
2507                 }
2508
2509                 /*
2510                 Make sure sector is loaded
2511                  */
2512
2513                 MapSector *sector = getSectorNoGenerateNoEx(p2d);
2514                 if (sector == NULL) {
2515                         try {
2516                                 sector = loadSectorMeta(sectordir, loadlayout != 2);
2517                         } catch(InvalidFilenameException &e) {
2518                                 return NULL;
2519                         } catch(FileNotGoodException &e) {
2520                                 return NULL;
2521                         } catch(std::exception &e) {
2522                                 return NULL;
2523                         }
2524                 }
2525
2526
2527                 /*
2528                 Make sure file exists
2529                  */
2530
2531                 std::string blockfilename = getBlockFilename(blockpos);
2532                 if (fs::PathExists(sectordir + DIR_DELIM + blockfilename) == false)
2533                         return NULL;
2534
2535                 /*
2536                 Load block and save it to the database
2537                  */
2538                 loadBlock(sectordir, blockfilename, sector, true);
2539         }
2540         MapBlock *block = getBlockNoCreateNoEx(blockpos);
2541         if (created_new && (block != NULL)) {
2542                 std::map<v3s16, MapBlock*> modified_blocks;
2543                 // Fix lighting if necessary
2544                 voxalgo::update_block_border_lighting(this, block, modified_blocks);
2545                 if (!modified_blocks.empty()) {
2546                         //Modified lighting, send event
2547                         MapEditEvent event;
2548                         event.type = MEET_OTHER;
2549                         std::map<v3s16, MapBlock *>::iterator it;
2550                         for (it = modified_blocks.begin();
2551                                         it != modified_blocks.end(); ++it)
2552                                 event.modified_blocks.insert(it->first);
2553                         dispatchEvent(&event);
2554                 }
2555         }
2556         return block;
2557 }
2558
2559 bool ServerMap::deleteBlock(v3s16 blockpos)
2560 {
2561         if (!dbase->deleteBlock(blockpos))
2562                 return false;
2563
2564         MapBlock *block = getBlockNoCreateNoEx(blockpos);
2565         if (block) {
2566                 v2s16 p2d(blockpos.X, blockpos.Z);
2567                 MapSector *sector = getSectorNoGenerateNoEx(p2d);
2568                 if (!sector)
2569                         return false;
2570                 sector->deleteBlock(block);
2571         }
2572
2573         return true;
2574 }
2575
2576 void ServerMap::PrintInfo(std::ostream &out)
2577 {
2578         out<<"ServerMap: ";
2579 }
2580
2581 MMVManip::MMVManip(Map *map):
2582                 VoxelManipulator(),
2583                 m_is_dirty(false),
2584                 m_create_area(false),
2585                 m_map(map)
2586 {
2587 }
2588
2589 MMVManip::~MMVManip()
2590 {
2591 }
2592
2593 void MMVManip::initialEmerge(v3s16 blockpos_min, v3s16 blockpos_max,
2594         bool load_if_inexistent)
2595 {
2596         TimeTaker timer1("initialEmerge", &emerge_time);
2597
2598         // Units of these are MapBlocks
2599         v3s16 p_min = blockpos_min;
2600         v3s16 p_max = blockpos_max;
2601
2602         VoxelArea block_area_nodes
2603                         (p_min*MAP_BLOCKSIZE, (p_max+1)*MAP_BLOCKSIZE-v3s16(1,1,1));
2604
2605         u32 size_MB = block_area_nodes.getVolume()*4/1000000;
2606         if(size_MB >= 1)
2607         {
2608                 infostream<<"initialEmerge: area: ";
2609                 block_area_nodes.print(infostream);
2610                 infostream<<" ("<<size_MB<<"MB)";
2611                 infostream<<std::endl;
2612         }
2613
2614         addArea(block_area_nodes);
2615
2616         for(s32 z=p_min.Z; z<=p_max.Z; z++)
2617         for(s32 y=p_min.Y; y<=p_max.Y; y++)
2618         for(s32 x=p_min.X; x<=p_max.X; x++)
2619         {
2620                 u8 flags = 0;
2621                 MapBlock *block;
2622                 v3s16 p(x,y,z);
2623                 std::map<v3s16, u8>::iterator n;
2624                 n = m_loaded_blocks.find(p);
2625                 if(n != m_loaded_blocks.end())
2626                         continue;
2627
2628                 bool block_data_inexistent = false;
2629                 try
2630                 {
2631                         TimeTaker timer1("emerge load", &emerge_load_time);
2632
2633                         block = m_map->getBlockNoCreate(p);
2634                         if(block->isDummy())
2635                                 block_data_inexistent = true;
2636                         else
2637                                 block->copyTo(*this);
2638                 }
2639                 catch(InvalidPositionException &e)
2640                 {
2641                         block_data_inexistent = true;
2642                 }
2643
2644                 if(block_data_inexistent)
2645                 {
2646
2647                         if (load_if_inexistent && !blockpos_over_max_limit(p)) {
2648                                 ServerMap *svrmap = (ServerMap *)m_map;
2649                                 block = svrmap->emergeBlock(p, false);
2650                                 if (block == NULL)
2651                                         block = svrmap->createBlock(p);
2652                                 block->copyTo(*this);
2653                         } else {
2654                                 flags |= VMANIP_BLOCK_DATA_INEXIST;
2655
2656                                 /*
2657                                         Mark area inexistent
2658                                 */
2659                                 VoxelArea a(p*MAP_BLOCKSIZE, (p+1)*MAP_BLOCKSIZE-v3s16(1,1,1));
2660                                 // Fill with VOXELFLAG_NO_DATA
2661                                 for(s32 z=a.MinEdge.Z; z<=a.MaxEdge.Z; z++)
2662                                 for(s32 y=a.MinEdge.Y; y<=a.MaxEdge.Y; y++)
2663                                 {
2664                                         s32 i = m_area.index(a.MinEdge.X,y,z);
2665                                         memset(&m_flags[i], VOXELFLAG_NO_DATA, MAP_BLOCKSIZE);
2666                                 }
2667                         }
2668                 }
2669                 /*else if (block->getNode(0, 0, 0).getContent() == CONTENT_IGNORE)
2670                 {
2671                         // Mark that block was loaded as blank
2672                         flags |= VMANIP_BLOCK_CONTAINS_CIGNORE;
2673                 }*/
2674
2675                 m_loaded_blocks[p] = flags;
2676         }
2677
2678         m_is_dirty = false;
2679 }
2680
2681 void MMVManip::blitBackAll(std::map<v3s16, MapBlock*> *modified_blocks,
2682         bool overwrite_generated)
2683 {
2684         if(m_area.getExtent() == v3s16(0,0,0))
2685                 return;
2686
2687         /*
2688                 Copy data of all blocks
2689         */
2690         for(std::map<v3s16, u8>::iterator
2691                         i = m_loaded_blocks.begin();
2692                         i != m_loaded_blocks.end(); ++i)
2693         {
2694                 v3s16 p = i->first;
2695                 MapBlock *block = m_map->getBlockNoCreateNoEx(p);
2696                 bool existed = !(i->second & VMANIP_BLOCK_DATA_INEXIST);
2697                 if ((existed == false) || (block == NULL) ||
2698                         (overwrite_generated == false && block->isGenerated() == true))
2699                         continue;
2700
2701                 block->copyFrom(*this);
2702
2703                 if(modified_blocks)
2704                         (*modified_blocks)[p] = block;
2705         }
2706 }
2707
2708 //END