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::blockpos_over_mapgen_limit(v3s16 p)
1371 {
1372         const s16 mapgen_limit_bp = rangelim(
1373                 getMapgenParams()->mapgen_limit, 0, MAX_MAP_GENERATION_LIMIT) /
1374                 MAP_BLOCKSIZE;
1375         return p.X < -mapgen_limit_bp ||
1376                 p.X >  mapgen_limit_bp ||
1377                 p.Y < -mapgen_limit_bp ||
1378                 p.Y >  mapgen_limit_bp ||
1379                 p.Z < -mapgen_limit_bp ||
1380                 p.Z >  mapgen_limit_bp;
1381 }
1382
1383 bool ServerMap::initBlockMake(v3s16 blockpos, BlockMakeData *data)
1384 {
1385         s16 csize = getMapgenParams()->chunksize;
1386         v3s16 bpmin = EmergeManager::getContainingChunk(blockpos, csize);
1387         v3s16 bpmax = bpmin + v3s16(1, 1, 1) * (csize - 1);
1388
1389         bool enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
1390         EMERGE_DBG_OUT("initBlockMake(): " PP(bpmin) " - " PP(bpmax));
1391
1392         v3s16 extra_borders(1, 1, 1);
1393         v3s16 full_bpmin = bpmin - extra_borders;
1394         v3s16 full_bpmax = bpmax + extra_borders;
1395
1396         // Do nothing if not inside mapgen limits (+-1 because of neighbors)
1397         if (blockpos_over_mapgen_limit(full_bpmin) ||
1398                         blockpos_over_mapgen_limit(full_bpmax))
1399                 return false;
1400
1401         data->seed = getSeed();
1402         data->blockpos_min = bpmin;
1403         data->blockpos_max = bpmax;
1404         data->blockpos_requested = blockpos;
1405         data->nodedef = m_nodedef;
1406
1407         /*
1408                 Create the whole area of this and the neighboring blocks
1409         */
1410         for (s16 x = full_bpmin.X; x <= full_bpmax.X; x++)
1411         for (s16 z = full_bpmin.Z; z <= full_bpmax.Z; z++) {
1412                 v2s16 sectorpos(x, z);
1413                 // Sector metadata is loaded from disk if not already loaded.
1414                 ServerMapSector *sector = createSector(sectorpos);
1415                 FATAL_ERROR_IF(sector == NULL, "createSector() failed");
1416
1417                 for (s16 y = full_bpmin.Y; y <= full_bpmax.Y; y++) {
1418                         v3s16 p(x, y, z);
1419
1420                         MapBlock *block = emergeBlock(p, false);
1421                         if (block == NULL) {
1422                                 block = createBlock(p);
1423
1424                                 // Block gets sunlight if this is true.
1425                                 // Refer to the map generator heuristics.
1426                                 bool ug = m_emerge->isBlockUnderground(p);
1427                                 block->setIsUnderground(ug);
1428                         }
1429                 }
1430         }
1431
1432         /*
1433                 Now we have a big empty area.
1434
1435                 Make a ManualMapVoxelManipulator that contains this and the
1436                 neighboring blocks
1437         */
1438
1439         data->vmanip = new MMVManip(this);
1440         data->vmanip->initialEmerge(full_bpmin, full_bpmax);
1441
1442         // Note: we may need this again at some point.
1443 #if 0
1444         // Ensure none of the blocks to be generated were marked as
1445         // containing CONTENT_IGNORE
1446         for (s16 z = blockpos_min.Z; z <= blockpos_max.Z; z++) {
1447                 for (s16 y = blockpos_min.Y; y <= blockpos_max.Y; y++) {
1448                         for (s16 x = blockpos_min.X; x <= blockpos_max.X; x++) {
1449                                 core::map<v3s16, u8>::Node *n;
1450                                 n = data->vmanip->m_loaded_blocks.find(v3s16(x, y, z));
1451                                 if (n == NULL)
1452                                         continue;
1453                                 u8 flags = n->getValue();
1454                                 flags &= ~VMANIP_BLOCK_CONTAINS_CIGNORE;
1455                                 n->setValue(flags);
1456                         }
1457                 }
1458         }
1459 #endif
1460
1461         // Data is ready now.
1462         return true;
1463 }
1464
1465 void ServerMap::finishBlockMake(BlockMakeData *data,
1466         std::map<v3s16, MapBlock*> *changed_blocks)
1467 {
1468         v3s16 bpmin = data->blockpos_min;
1469         v3s16 bpmax = data->blockpos_max;
1470
1471         v3s16 extra_borders(1, 1, 1);
1472
1473         bool enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
1474         EMERGE_DBG_OUT("finishBlockMake(): " PP(bpmin) " - " PP(bpmax));
1475
1476         /*
1477                 Blit generated stuff to map
1478                 NOTE: blitBackAll adds nearly everything to changed_blocks
1479         */
1480         data->vmanip->blitBackAll(changed_blocks);
1481
1482         EMERGE_DBG_OUT("finishBlockMake: changed_blocks.size()="
1483                 << changed_blocks->size());
1484
1485         /*
1486                 Copy transforming liquid information
1487         */
1488         while (data->transforming_liquid.size()) {
1489                 m_transforming_liquid.push_back(data->transforming_liquid.front());
1490                 data->transforming_liquid.pop_front();
1491         }
1492
1493         for (std::map<v3s16, MapBlock *>::iterator
1494                         it = changed_blocks->begin();
1495                         it != changed_blocks->end(); ++it) {
1496                 MapBlock *block = it->second;
1497                 if (!block)
1498                         continue;
1499                 /*
1500                         Update day/night difference cache of the MapBlocks
1501                 */
1502                 block->expireDayNightDiff();
1503                 /*
1504                         Set block as modified
1505                 */
1506                 block->raiseModified(MOD_STATE_WRITE_NEEDED,
1507                         MOD_REASON_EXPIRE_DAYNIGHTDIFF);
1508         }
1509
1510         /*
1511                 Set central blocks as generated
1512         */
1513         for (s16 x = bpmin.X; x <= bpmax.X; x++)
1514         for (s16 z = bpmin.Z; z <= bpmax.Z; z++)
1515         for (s16 y = bpmin.Y; y <= bpmax.Y; y++) {
1516                 MapBlock *block = getBlockNoCreateNoEx(v3s16(x, y, z));
1517                 if (!block)
1518                         continue;
1519
1520                 block->setGenerated(true);
1521         }
1522
1523         /*
1524                 Save changed parts of map
1525                 NOTE: Will be saved later.
1526         */
1527         //save(MOD_STATE_WRITE_AT_UNLOAD);
1528 }
1529
1530 ServerMapSector *ServerMap::createSector(v2s16 p2d)
1531 {
1532         DSTACKF("%s: p2d=(%d,%d)",
1533                         FUNCTION_NAME,
1534                         p2d.X, p2d.Y);
1535
1536         /*
1537                 Check if it exists already in memory
1538         */
1539         ServerMapSector *sector = (ServerMapSector*)getSectorNoGenerateNoEx(p2d);
1540         if(sector != NULL)
1541                 return sector;
1542
1543         /*
1544                 Try to load it from disk (with blocks)
1545         */
1546         //if(loadSectorFull(p2d) == true)
1547
1548         /*
1549                 Try to load metadata from disk
1550         */
1551 #if 0
1552         if(loadSectorMeta(p2d) == true)
1553         {
1554                 ServerMapSector *sector = (ServerMapSector*)getSectorNoGenerateNoEx(p2d);
1555                 if(sector == NULL)
1556                 {
1557                         infostream<<"ServerMap::createSector(): loadSectorFull didn't make a sector"<<std::endl;
1558                         throw InvalidPositionException("");
1559                 }
1560                 return sector;
1561         }
1562 #endif
1563
1564         /*
1565                 Do not create over max mapgen limit
1566         */
1567         const s16 max_limit_bp = MAX_MAP_GENERATION_LIMIT / MAP_BLOCKSIZE;
1568         if (p2d.X < -max_limit_bp ||
1569                         p2d.X >  max_limit_bp ||
1570                         p2d.Y < -max_limit_bp ||
1571                         p2d.Y >  max_limit_bp)
1572                 throw InvalidPositionException("createSector(): pos. over max mapgen limit");
1573
1574         /*
1575                 Generate blank sector
1576         */
1577
1578         sector = new ServerMapSector(this, p2d, m_gamedef);
1579
1580         // Sector position on map in nodes
1581         //v2s16 nodepos2d = p2d * MAP_BLOCKSIZE;
1582
1583         /*
1584                 Insert to container
1585         */
1586         m_sectors[p2d] = sector;
1587
1588         return sector;
1589 }
1590
1591 #if 0
1592 /*
1593         This is a quick-hand function for calling makeBlock().
1594 */
1595 MapBlock * ServerMap::generateBlock(
1596                 v3s16 p,
1597                 std::map<v3s16, MapBlock*> &modified_blocks
1598 )
1599 {
1600         DSTACKF("%s: p=(%d,%d,%d)", FUNCTION_NAME, p.X, p.Y, p.Z);
1601
1602         /*infostream<<"generateBlock(): "
1603                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
1604                         <<std::endl;*/
1605
1606         bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
1607
1608         TimeTaker timer("generateBlock");
1609
1610         //MapBlock *block = original_dummy;
1611
1612         v2s16 p2d(p.X, p.Z);
1613         v2s16 p2d_nodes = p2d * MAP_BLOCKSIZE;
1614
1615         /*
1616                 Do not generate over-limit
1617         */
1618         if(blockpos_over_limit(p))
1619         {
1620                 infostream<<FUNCTION_NAME<<": Block position over limit"<<std::endl;
1621                 throw InvalidPositionException("generateBlock(): pos. over limit");
1622         }
1623
1624         /*
1625                 Create block make data
1626         */
1627         BlockMakeData data;
1628         initBlockMake(&data, p);
1629
1630         /*
1631                 Generate block
1632         */
1633         {
1634                 TimeTaker t("mapgen::make_block()");
1635                 mapgen->makeChunk(&data);
1636                 //mapgen::make_block(&data);
1637
1638                 if(enable_mapgen_debug_info == false)
1639                         t.stop(true); // Hide output
1640         }
1641
1642         /*
1643                 Blit data back on map, update lighting, add mobs and whatever this does
1644         */
1645         finishBlockMake(&data, modified_blocks);
1646
1647         /*
1648                 Get central block
1649         */
1650         MapBlock *block = getBlockNoCreateNoEx(p);
1651
1652 #if 0
1653         /*
1654                 Check result
1655         */
1656         if(block)
1657         {
1658                 bool erroneus_content = false;
1659                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
1660                 for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
1661                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
1662                 {
1663                         v3s16 p(x0,y0,z0);
1664                         MapNode n = block->getNode(p);
1665                         if(n.getContent() == CONTENT_IGNORE)
1666                         {
1667                                 infostream<<"CONTENT_IGNORE at "
1668                                                 <<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
1669                                                 <<std::endl;
1670                                 erroneus_content = true;
1671                                 assert(0);
1672                         }
1673                 }
1674                 if(erroneus_content)
1675                 {
1676                         assert(0);
1677                 }
1678         }
1679 #endif
1680
1681 #if 0
1682         /*
1683                 Generate a completely empty block
1684         */
1685         if(block)
1686         {
1687                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
1688                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
1689                 {
1690                         for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
1691                         {
1692                                 MapNode n;
1693                                 n.setContent(CONTENT_AIR);
1694                                 block->setNode(v3s16(x0,y0,z0), n);
1695                         }
1696                 }
1697         }
1698 #endif
1699
1700         if(enable_mapgen_debug_info == false)
1701                 timer.stop(true); // Hide output
1702
1703         return block;
1704 }
1705 #endif
1706
1707 MapBlock * ServerMap::createBlock(v3s16 p)
1708 {
1709         DSTACKF("%s: p=(%d,%d,%d)",
1710                         FUNCTION_NAME, p.X, p.Y, p.Z);
1711
1712         /*
1713                 Do not create over max mapgen limit
1714         */
1715         if (blockpos_over_max_limit(p))
1716                 throw InvalidPositionException("createBlock(): pos. over max mapgen limit");
1717
1718         v2s16 p2d(p.X, p.Z);
1719         s16 block_y = p.Y;
1720         /*
1721                 This will create or load a sector if not found in memory.
1722                 If block exists on disk, it will be loaded.
1723
1724                 NOTE: On old save formats, this will be slow, as it generates
1725                       lighting on blocks for them.
1726         */
1727         ServerMapSector *sector;
1728         try {
1729                 sector = (ServerMapSector*)createSector(p2d);
1730                 assert(sector->getId() == MAPSECTOR_SERVER);
1731         }
1732         catch(InvalidPositionException &e)
1733         {
1734                 infostream<<"createBlock: createSector() failed"<<std::endl;
1735                 throw e;
1736         }
1737         /*
1738                 NOTE: This should not be done, or at least the exception
1739                 should not be passed on as std::exception, because it
1740                 won't be catched at all.
1741         */
1742         /*catch(std::exception &e)
1743         {
1744                 infostream<<"createBlock: createSector() failed: "
1745                                 <<e.what()<<std::endl;
1746                 throw e;
1747         }*/
1748
1749         /*
1750                 Try to get a block from the sector
1751         */
1752
1753         MapBlock *block = sector->getBlockNoCreateNoEx(block_y);
1754         if(block)
1755         {
1756                 if(block->isDummy())
1757                         block->unDummify();
1758                 return block;
1759         }
1760         // Create blank
1761         block = sector->createBlankBlock(block_y);
1762
1763         return block;
1764 }
1765
1766 MapBlock * ServerMap::emergeBlock(v3s16 p, bool create_blank)
1767 {
1768         DSTACKF("%s: p=(%d,%d,%d), create_blank=%d",
1769                         FUNCTION_NAME,
1770                         p.X, p.Y, p.Z, create_blank);
1771
1772         {
1773                 MapBlock *block = getBlockNoCreateNoEx(p);
1774                 if(block && block->isDummy() == false)
1775                         return block;
1776         }
1777
1778         {
1779                 MapBlock *block = loadBlock(p);
1780                 if(block)
1781                         return block;
1782         }
1783
1784         if (create_blank) {
1785                 ServerMapSector *sector = createSector(v2s16(p.X, p.Z));
1786                 MapBlock *block = sector->createBlankBlock(p.Y);
1787
1788                 return block;
1789         }
1790
1791 #if 0
1792         if(allow_generate)
1793         {
1794                 std::map<v3s16, MapBlock*> modified_blocks;
1795                 MapBlock *block = generateBlock(p, modified_blocks);
1796                 if(block)
1797                 {
1798                         MapEditEvent event;
1799                         event.type = MEET_OTHER;
1800                         event.p = p;
1801
1802                         // Copy modified_blocks to event
1803                         for(std::map<v3s16, MapBlock*>::iterator
1804                                         i = modified_blocks.begin();
1805                                         i != modified_blocks.end(); ++i)
1806                         {
1807                                 event.modified_blocks.insert(i->first);
1808                         }
1809
1810                         // Queue event
1811                         dispatchEvent(&event);
1812
1813                         return block;
1814                 }
1815         }
1816 #endif
1817
1818         return NULL;
1819 }
1820
1821 MapBlock *ServerMap::getBlockOrEmerge(v3s16 p3d)
1822 {
1823         MapBlock *block = getBlockNoCreateNoEx(p3d);
1824         if (block == NULL)
1825                 m_emerge->enqueueBlockEmerge(PEER_ID_INEXISTENT, p3d, false);
1826
1827         return block;
1828 }
1829
1830 void ServerMap::prepareBlock(MapBlock *block) {
1831 }
1832
1833 // N.B.  This requires no synchronization, since data will not be modified unless
1834 // the VoxelManipulator being updated belongs to the same thread.
1835 void ServerMap::updateVManip(v3s16 pos)
1836 {
1837         Mapgen *mg = m_emerge->getCurrentMapgen();
1838         if (!mg)
1839                 return;
1840
1841         MMVManip *vm = mg->vm;
1842         if (!vm)
1843                 return;
1844
1845         if (!vm->m_area.contains(pos))
1846                 return;
1847
1848         s32 idx = vm->m_area.index(pos);
1849         vm->m_data[idx] = getNodeNoEx(pos);
1850         vm->m_flags[idx] &= ~VOXELFLAG_NO_DATA;
1851
1852         vm->m_is_dirty = true;
1853 }
1854
1855 s16 ServerMap::findGroundLevel(v2s16 p2d)
1856 {
1857 #if 0
1858         /*
1859                 Uh, just do something random...
1860         */
1861         // Find existing map from top to down
1862         s16 max=63;
1863         s16 min=-64;
1864         v3s16 p(p2d.X, max, p2d.Y);
1865         for(; p.Y>min; p.Y--)
1866         {
1867                 MapNode n = getNodeNoEx(p);
1868                 if(n.getContent() != CONTENT_IGNORE)
1869                         break;
1870         }
1871         if(p.Y == min)
1872                 goto plan_b;
1873         // If this node is not air, go to plan b
1874         if(getNodeNoEx(p).getContent() != CONTENT_AIR)
1875                 goto plan_b;
1876         // Search existing walkable and return it
1877         for(; p.Y>min; p.Y--)
1878         {
1879                 MapNode n = getNodeNoEx(p);
1880                 if(content_walkable(n.d) && n.getContent() != CONTENT_IGNORE)
1881                         return p.Y;
1882         }
1883
1884         // Move to plan b
1885 plan_b:
1886 #endif
1887
1888         /*
1889                 Determine from map generator noise functions
1890         */
1891
1892         s16 level = m_emerge->getGroundLevelAtPoint(p2d);
1893         return level;
1894
1895         //double level = base_rock_level_2d(m_seed, p2d) + AVERAGE_MUD_AMOUNT;
1896         //return (s16)level;
1897 }
1898
1899 bool ServerMap::loadFromFolders() {
1900         if (!dbase->initialized() &&
1901                         !fs::PathExists(m_savedir + DIR_DELIM + "map.sqlite"))
1902                 return true;
1903         return false;
1904 }
1905
1906 void ServerMap::createDirs(std::string path)
1907 {
1908         if(fs::CreateAllDirs(path) == false)
1909         {
1910                 m_dout<<"ServerMap: Failed to create directory "
1911                                 <<"\""<<path<<"\""<<std::endl;
1912                 throw BaseException("ServerMap failed to create directory");
1913         }
1914 }
1915
1916 std::string ServerMap::getSectorDir(v2s16 pos, int layout)
1917 {
1918         char cc[9];
1919         switch(layout)
1920         {
1921                 case 1:
1922                         snprintf(cc, 9, "%.4x%.4x",
1923                                 (unsigned int) pos.X & 0xffff,
1924                                 (unsigned int) pos.Y & 0xffff);
1925
1926                         return m_savedir + DIR_DELIM + "sectors" + DIR_DELIM + cc;
1927                 case 2:
1928                         snprintf(cc, 9, (std::string("%.3x") + DIR_DELIM + "%.3x").c_str(),
1929                                 (unsigned int) pos.X & 0xfff,
1930                                 (unsigned int) pos.Y & 0xfff);
1931
1932                         return m_savedir + DIR_DELIM + "sectors2" + DIR_DELIM + cc;
1933                 default:
1934                         assert(false);
1935                         return "";
1936         }
1937 }
1938
1939 v2s16 ServerMap::getSectorPos(std::string dirname)
1940 {
1941         unsigned int x = 0, y = 0;
1942         int r;
1943         std::string component;
1944         fs::RemoveLastPathComponent(dirname, &component, 1);
1945         if(component.size() == 8)
1946         {
1947                 // Old layout
1948                 r = sscanf(component.c_str(), "%4x%4x", &x, &y);
1949         }
1950         else if(component.size() == 3)
1951         {
1952                 // New layout
1953                 fs::RemoveLastPathComponent(dirname, &component, 2);
1954                 r = sscanf(component.c_str(), (std::string("%3x") + DIR_DELIM + "%3x").c_str(), &x, &y);
1955                 // Sign-extend the 12 bit values up to 16 bits...
1956                 if(x & 0x800) x |= 0xF000;
1957                 if(y & 0x800) y |= 0xF000;
1958         }
1959         else
1960         {
1961                 r = -1;
1962         }
1963
1964         FATAL_ERROR_IF(r != 2, "getSectorPos()");
1965         v2s16 pos((s16)x, (s16)y);
1966         return pos;
1967 }
1968
1969 v3s16 ServerMap::getBlockPos(std::string sectordir, std::string blockfile)
1970 {
1971         v2s16 p2d = getSectorPos(sectordir);
1972
1973         if(blockfile.size() != 4){
1974                 throw InvalidFilenameException("Invalid block filename");
1975         }
1976         unsigned int y;
1977         int r = sscanf(blockfile.c_str(), "%4x", &y);
1978         if(r != 1)
1979                 throw InvalidFilenameException("Invalid block filename");
1980         return v3s16(p2d.X, y, p2d.Y);
1981 }
1982
1983 std::string ServerMap::getBlockFilename(v3s16 p)
1984 {
1985         char cc[5];
1986         snprintf(cc, 5, "%.4x", (unsigned int)p.Y&0xffff);
1987         return cc;
1988 }
1989
1990 void ServerMap::save(ModifiedState save_level)
1991 {
1992         DSTACK(FUNCTION_NAME);
1993         if(m_map_saving_enabled == false) {
1994                 warningstream<<"Not saving map, saving disabled."<<std::endl;
1995                 return;
1996         }
1997
1998         if(save_level == MOD_STATE_CLEAN)
1999                 infostream<<"ServerMap: Saving whole map, this can take time."
2000                                 <<std::endl;
2001
2002         if (m_map_metadata_changed || save_level == MOD_STATE_CLEAN) {
2003                 if (settings_mgr.saveMapMeta())
2004                         m_map_metadata_changed = false;
2005         }
2006
2007         // Profile modified reasons
2008         Profiler modprofiler;
2009
2010         u32 sector_meta_count = 0;
2011         u32 block_count = 0;
2012         u32 block_count_all = 0; // Number of blocks in memory
2013
2014         // Don't do anything with sqlite unless something is really saved
2015         bool save_started = false;
2016
2017         for(std::map<v2s16, MapSector*>::iterator i = m_sectors.begin();
2018                 i != m_sectors.end(); ++i) {
2019                 ServerMapSector *sector = (ServerMapSector*)i->second;
2020                 assert(sector->getId() == MAPSECTOR_SERVER);
2021
2022                 if(sector->differs_from_disk || save_level == MOD_STATE_CLEAN) {
2023                         saveSectorMeta(sector);
2024                         sector_meta_count++;
2025                 }
2026
2027                 MapBlockVect blocks;
2028                 sector->getBlocks(blocks);
2029
2030                 for(MapBlockVect::iterator j = blocks.begin();
2031                         j != blocks.end(); ++j) {
2032                         MapBlock *block = *j;
2033
2034                         block_count_all++;
2035
2036                         if(block->getModified() >= (u32)save_level) {
2037                                 // Lazy beginSave()
2038                                 if(!save_started) {
2039                                         beginSave();
2040                                         save_started = true;
2041                                 }
2042
2043                                 modprofiler.add(block->getModifiedReasonString(), 1);
2044
2045                                 saveBlock(block);
2046                                 block_count++;
2047
2048                                 /*infostream<<"ServerMap: Written block ("
2049                                                 <<block->getPos().X<<","
2050                                                 <<block->getPos().Y<<","
2051                                                 <<block->getPos().Z<<")"
2052                                                 <<std::endl;*/
2053                         }
2054                 }
2055         }
2056
2057         if(save_started)
2058                 endSave();
2059
2060         /*
2061                 Only print if something happened or saved whole map
2062         */
2063         if(save_level == MOD_STATE_CLEAN || sector_meta_count != 0
2064                         || block_count != 0) {
2065                 infostream<<"ServerMap: Written: "
2066                                 <<sector_meta_count<<" sector metadata files, "
2067                                 <<block_count<<" block files"
2068                                 <<", "<<block_count_all<<" blocks in memory."
2069                                 <<std::endl;
2070                 PrintInfo(infostream); // ServerMap/ClientMap:
2071                 infostream<<"Blocks modified by: "<<std::endl;
2072                 modprofiler.print(infostream);
2073         }
2074 }
2075
2076 void ServerMap::listAllLoadableBlocks(std::vector<v3s16> &dst)
2077 {
2078         if (loadFromFolders()) {
2079                 errorstream << "Map::listAllLoadableBlocks(): Result will be missing "
2080                                 << "all blocks that are stored in flat files." << std::endl;
2081         }
2082         dbase->listAllLoadableBlocks(dst);
2083 }
2084
2085 void ServerMap::listAllLoadedBlocks(std::vector<v3s16> &dst)
2086 {
2087         for(std::map<v2s16, MapSector*>::iterator si = m_sectors.begin();
2088                 si != m_sectors.end(); ++si)
2089         {
2090                 MapSector *sector = si->second;
2091
2092                 MapBlockVect blocks;
2093                 sector->getBlocks(blocks);
2094
2095                 for(MapBlockVect::iterator i = blocks.begin();
2096                                 i != blocks.end(); ++i) {
2097                         v3s16 p = (*i)->getPos();
2098                         dst.push_back(p);
2099                 }
2100         }
2101 }
2102
2103 void ServerMap::saveSectorMeta(ServerMapSector *sector)
2104 {
2105         DSTACK(FUNCTION_NAME);
2106         // Format used for writing
2107         u8 version = SER_FMT_VER_HIGHEST_WRITE;
2108         // Get destination
2109         v2s16 pos = sector->getPos();
2110         std::string dir = getSectorDir(pos);
2111         createDirs(dir);
2112
2113         std::string fullpath = dir + DIR_DELIM + "meta";
2114         std::ostringstream ss(std::ios_base::binary);
2115
2116         sector->serialize(ss, version);
2117
2118         if(!fs::safeWriteToFile(fullpath, ss.str()))
2119                 throw FileNotGoodException("Cannot write sector metafile");
2120
2121         sector->differs_from_disk = false;
2122 }
2123
2124 MapSector* ServerMap::loadSectorMeta(std::string sectordir, bool save_after_load)
2125 {
2126         DSTACK(FUNCTION_NAME);
2127         // Get destination
2128         v2s16 p2d = getSectorPos(sectordir);
2129
2130         ServerMapSector *sector = NULL;
2131
2132         std::string fullpath = sectordir + DIR_DELIM + "meta";
2133         std::ifstream is(fullpath.c_str(), std::ios_base::binary);
2134         if(is.good() == false)
2135         {
2136                 // If the directory exists anyway, it probably is in some old
2137                 // format. Just go ahead and create the sector.
2138                 if(fs::PathExists(sectordir))
2139                 {
2140                         /*infostream<<"ServerMap::loadSectorMeta(): Sector metafile "
2141                                         <<fullpath<<" doesn't exist but directory does."
2142                                         <<" Continuing with a sector with no metadata."
2143                                         <<std::endl;*/
2144                         sector = new ServerMapSector(this, p2d, m_gamedef);
2145                         m_sectors[p2d] = sector;
2146                 }
2147                 else
2148                 {
2149                         throw FileNotGoodException("Cannot open sector metafile");
2150                 }
2151         }
2152         else
2153         {
2154                 sector = ServerMapSector::deSerialize
2155                                 (is, this, p2d, m_sectors, m_gamedef);
2156                 if(save_after_load)
2157                         saveSectorMeta(sector);
2158         }
2159
2160         sector->differs_from_disk = false;
2161
2162         return sector;
2163 }
2164
2165 bool ServerMap::loadSectorMeta(v2s16 p2d)
2166 {
2167         DSTACK(FUNCTION_NAME);
2168
2169         // The directory layout we're going to load from.
2170         //  1 - original sectors/xxxxzzzz/
2171         //  2 - new sectors2/xxx/zzz/
2172         //  If we load from anything but the latest structure, we will
2173         //  immediately save to the new one, and remove the old.
2174         int loadlayout = 1;
2175         std::string sectordir1 = getSectorDir(p2d, 1);
2176         std::string sectordir;
2177         if(fs::PathExists(sectordir1))
2178         {
2179                 sectordir = sectordir1;
2180         }
2181         else
2182         {
2183                 loadlayout = 2;
2184                 sectordir = getSectorDir(p2d, 2);
2185         }
2186
2187         try{
2188                 loadSectorMeta(sectordir, loadlayout != 2);
2189         }
2190         catch(InvalidFilenameException &e)
2191         {
2192                 return false;
2193         }
2194         catch(FileNotGoodException &e)
2195         {
2196                 return false;
2197         }
2198         catch(std::exception &e)
2199         {
2200                 return false;
2201         }
2202
2203         return true;
2204 }
2205
2206 #if 0
2207 bool ServerMap::loadSectorFull(v2s16 p2d)
2208 {
2209         DSTACK(FUNCTION_NAME);
2210
2211         MapSector *sector = NULL;
2212
2213         // The directory layout we're going to load from.
2214         //  1 - original sectors/xxxxzzzz/
2215         //  2 - new sectors2/xxx/zzz/
2216         //  If we load from anything but the latest structure, we will
2217         //  immediately save to the new one, and remove the old.
2218         int loadlayout = 1;
2219         std::string sectordir1 = getSectorDir(p2d, 1);
2220         std::string sectordir;
2221         if(fs::PathExists(sectordir1))
2222         {
2223                 sectordir = sectordir1;
2224         }
2225         else
2226         {
2227                 loadlayout = 2;
2228                 sectordir = getSectorDir(p2d, 2);
2229         }
2230
2231         try{
2232                 sector = loadSectorMeta(sectordir, loadlayout != 2);
2233         }
2234         catch(InvalidFilenameException &e)
2235         {
2236                 return false;
2237         }
2238         catch(FileNotGoodException &e)
2239         {
2240                 return false;
2241         }
2242         catch(std::exception &e)
2243         {
2244                 return false;
2245         }
2246
2247         /*
2248                 Load blocks
2249         */
2250         std::vector<fs::DirListNode> list2 = fs::GetDirListing
2251                         (sectordir);
2252         std::vector<fs::DirListNode>::iterator i2;
2253         for(i2=list2.begin(); i2!=list2.end(); i2++)
2254         {
2255                 // We want files
2256                 if(i2->dir)
2257                         continue;
2258                 try{
2259                         loadBlock(sectordir, i2->name, sector, loadlayout != 2);
2260                 }
2261                 catch(InvalidFilenameException &e)
2262                 {
2263                         // This catches unknown crap in directory
2264                 }
2265         }
2266
2267         if(loadlayout != 2)
2268         {
2269                 infostream<<"Sector converted to new layout - deleting "<<
2270                         sectordir1<<std::endl;
2271                 fs::RecursiveDelete(sectordir1);
2272         }
2273
2274         return true;
2275 }
2276 #endif
2277
2278 Database *ServerMap::createDatabase(
2279         const std::string &name,
2280         const std::string &savedir,
2281         Settings &conf)
2282 {
2283         if (name == "sqlite3")
2284                 return new Database_SQLite3(savedir);
2285         if (name == "dummy")
2286                 return new Database_Dummy();
2287         #if USE_LEVELDB
2288         else if (name == "leveldb")
2289                 return new Database_LevelDB(savedir);
2290         #endif
2291         #if USE_REDIS
2292         else if (name == "redis")
2293                 return new Database_Redis(conf);
2294         #endif
2295         #if USE_POSTGRESQL
2296         else if (name == "postgresql")
2297                 return new Database_PostgreSQL(conf);
2298         #endif
2299         else
2300                 throw BaseException(std::string("Database backend ") + name + " not supported.");
2301 }
2302
2303 void ServerMap::beginSave()
2304 {
2305         dbase->beginSave();
2306 }
2307
2308 void ServerMap::endSave()
2309 {
2310         dbase->endSave();
2311 }
2312
2313 bool ServerMap::saveBlock(MapBlock *block)
2314 {
2315         return saveBlock(block, dbase);
2316 }
2317
2318 bool ServerMap::saveBlock(MapBlock *block, Database *db)
2319 {
2320         v3s16 p3d = block->getPos();
2321
2322         // Dummy blocks are not written
2323         if (block->isDummy()) {
2324                 warningstream << "saveBlock: Not writing dummy block "
2325                         << PP(p3d) << std::endl;
2326                 return true;
2327         }
2328
2329         // Format used for writing
2330         u8 version = SER_FMT_VER_HIGHEST_WRITE;
2331
2332         /*
2333                 [0] u8 serialization version
2334                 [1] data
2335         */
2336         std::ostringstream o(std::ios_base::binary);
2337         o.write((char*) &version, 1);
2338         block->serialize(o, version, true);
2339
2340         std::string data = o.str();
2341         bool ret = db->saveBlock(p3d, data);
2342         if (ret) {
2343                 // We just wrote it to the disk so clear modified flag
2344                 block->resetModified();
2345         }
2346         return ret;
2347 }
2348
2349 void ServerMap::loadBlock(std::string sectordir, std::string blockfile,
2350                 MapSector *sector, bool save_after_load)
2351 {
2352         DSTACK(FUNCTION_NAME);
2353
2354         std::string fullpath = sectordir + DIR_DELIM + blockfile;
2355         try {
2356
2357                 std::ifstream is(fullpath.c_str(), std::ios_base::binary);
2358                 if(is.good() == false)
2359                         throw FileNotGoodException("Cannot open block file");
2360
2361                 v3s16 p3d = getBlockPos(sectordir, blockfile);
2362                 v2s16 p2d(p3d.X, p3d.Z);
2363
2364                 assert(sector->getPos() == p2d);
2365
2366                 u8 version = SER_FMT_VER_INVALID;
2367                 is.read((char*)&version, 1);
2368
2369                 if(is.fail())
2370                         throw SerializationError("ServerMap::loadBlock(): Failed"
2371                                         " to read MapBlock version");
2372
2373                 /*u32 block_size = MapBlock::serializedLength(version);
2374                 SharedBuffer<u8> data(block_size);
2375                 is.read((char*)*data, block_size);*/
2376
2377                 // This will always return a sector because we're the server
2378                 //MapSector *sector = emergeSector(p2d);
2379
2380                 MapBlock *block = NULL;
2381                 bool created_new = false;
2382                 block = sector->getBlockNoCreateNoEx(p3d.Y);
2383                 if(block == NULL)
2384                 {
2385                         block = sector->createBlankBlockNoInsert(p3d.Y);
2386                         created_new = true;
2387                 }
2388
2389                 // Read basic data
2390                 block->deSerialize(is, version, true);
2391
2392                 // If it's a new block, insert it to the map
2393                 if (created_new) {
2394                         sector->insertBlock(block);
2395                         ReflowScan scanner(this, m_emerge->ndef);
2396                         scanner.scan(block, &m_transforming_liquid);
2397                 }
2398
2399                 /*
2400                         Save blocks loaded in old format in new format
2401                 */
2402
2403                 if(version < SER_FMT_VER_HIGHEST_WRITE || save_after_load)
2404                 {
2405                         saveBlock(block);
2406
2407                         // Should be in database now, so delete the old file
2408                         fs::RecursiveDelete(fullpath);
2409                 }
2410
2411                 // We just loaded it from the disk, so it's up-to-date.
2412                 block->resetModified();
2413
2414         }
2415         catch(SerializationError &e)
2416         {
2417                 warningstream<<"Invalid block data on disk "
2418                                 <<"fullpath="<<fullpath
2419                                 <<" (SerializationError). "
2420                                 <<"what()="<<e.what()
2421                                 <<std::endl;
2422                                 // Ignoring. A new one will be generated.
2423                 abort();
2424
2425                 // TODO: Backup file; name is in fullpath.
2426         }
2427 }
2428
2429 void ServerMap::loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool save_after_load)
2430 {
2431         DSTACK(FUNCTION_NAME);
2432
2433         try {
2434                 std::istringstream is(*blob, std::ios_base::binary);
2435
2436                 u8 version = SER_FMT_VER_INVALID;
2437                 is.read((char*)&version, 1);
2438
2439                 if(is.fail())
2440                         throw SerializationError("ServerMap::loadBlock(): Failed"
2441                                         " to read MapBlock version");
2442
2443                 MapBlock *block = NULL;
2444                 bool created_new = false;
2445                 block = sector->getBlockNoCreateNoEx(p3d.Y);
2446                 if(block == NULL)
2447                 {
2448                         block = sector->createBlankBlockNoInsert(p3d.Y);
2449                         created_new = true;
2450                 }
2451
2452                 // Read basic data
2453                 block->deSerialize(is, version, true);
2454
2455                 // If it's a new block, insert it to the map
2456                 if (created_new) {
2457                         sector->insertBlock(block);
2458                         ReflowScan scanner(this, m_emerge->ndef);
2459                         scanner.scan(block, &m_transforming_liquid);
2460                 }
2461
2462                 /*
2463                         Save blocks loaded in old format in new format
2464                 */
2465
2466                 //if(version < SER_FMT_VER_HIGHEST_READ || save_after_load)
2467                 // Only save if asked to; no need to update version
2468                 if(save_after_load)
2469                         saveBlock(block);
2470
2471                 // We just loaded it from, so it's up-to-date.
2472                 block->resetModified();
2473         }
2474         catch(SerializationError &e)
2475         {
2476                 errorstream<<"Invalid block data in database"
2477                                 <<" ("<<p3d.X<<","<<p3d.Y<<","<<p3d.Z<<")"
2478                                 <<" (SerializationError): "<<e.what()<<std::endl;
2479
2480                 // TODO: Block should be marked as invalid in memory so that it is
2481                 // not touched but the game can run
2482
2483                 if(g_settings->getBool("ignore_world_load_errors")){
2484                         errorstream<<"Ignoring block load error. Duck and cover! "
2485                                         <<"(ignore_world_load_errors)"<<std::endl;
2486                 } else {
2487                         throw SerializationError("Invalid block data in database");
2488                 }
2489         }
2490 }
2491
2492 MapBlock* ServerMap::loadBlock(v3s16 blockpos)
2493 {
2494         DSTACK(FUNCTION_NAME);
2495
2496         bool created_new = (getBlockNoCreateNoEx(blockpos) == NULL);
2497
2498         v2s16 p2d(blockpos.X, blockpos.Z);
2499
2500         std::string ret;
2501         dbase->loadBlock(blockpos, &ret);
2502         if (ret != "") {
2503                 loadBlock(&ret, blockpos, createSector(p2d), false);
2504         } else {
2505                 // Not found in database, try the files
2506
2507                 // The directory layout we're going to load from.
2508                 //  1 - original sectors/xxxxzzzz/
2509                 //  2 - new sectors2/xxx/zzz/
2510                 //  If we load from anything but the latest structure, we will
2511                 //  immediately save to the new one, and remove the old.
2512                 int loadlayout = 1;
2513                 std::string sectordir1 = getSectorDir(p2d, 1);
2514                 std::string sectordir;
2515                 if (fs::PathExists(sectordir1)) {
2516                         sectordir = sectordir1;
2517                 } else {
2518                         loadlayout = 2;
2519                         sectordir = getSectorDir(p2d, 2);
2520                 }
2521
2522                 /*
2523                 Make sure sector is loaded
2524                  */
2525
2526                 MapSector *sector = getSectorNoGenerateNoEx(p2d);
2527                 if (sector == NULL) {
2528                         try {
2529                                 sector = loadSectorMeta(sectordir, loadlayout != 2);
2530                         } catch(InvalidFilenameException &e) {
2531                                 return NULL;
2532                         } catch(FileNotGoodException &e) {
2533                                 return NULL;
2534                         } catch(std::exception &e) {
2535                                 return NULL;
2536                         }
2537                 }
2538
2539
2540                 /*
2541                 Make sure file exists
2542                  */
2543
2544                 std::string blockfilename = getBlockFilename(blockpos);
2545                 if (fs::PathExists(sectordir + DIR_DELIM + blockfilename) == false)
2546                         return NULL;
2547
2548                 /*
2549                 Load block and save it to the database
2550                  */
2551                 loadBlock(sectordir, blockfilename, sector, true);
2552         }
2553         MapBlock *block = getBlockNoCreateNoEx(blockpos);
2554         if (created_new && (block != NULL)) {
2555                 std::map<v3s16, MapBlock*> modified_blocks;
2556                 // Fix lighting if necessary
2557                 voxalgo::update_block_border_lighting(this, block, modified_blocks);
2558                 if (!modified_blocks.empty()) {
2559                         //Modified lighting, send event
2560                         MapEditEvent event;
2561                         event.type = MEET_OTHER;
2562                         std::map<v3s16, MapBlock *>::iterator it;
2563                         for (it = modified_blocks.begin();
2564                                         it != modified_blocks.end(); ++it)
2565                                 event.modified_blocks.insert(it->first);
2566                         dispatchEvent(&event);
2567                 }
2568         }
2569         return block;
2570 }
2571
2572 bool ServerMap::deleteBlock(v3s16 blockpos)
2573 {
2574         if (!dbase->deleteBlock(blockpos))
2575                 return false;
2576
2577         MapBlock *block = getBlockNoCreateNoEx(blockpos);
2578         if (block) {
2579                 v2s16 p2d(blockpos.X, blockpos.Z);
2580                 MapSector *sector = getSectorNoGenerateNoEx(p2d);
2581                 if (!sector)
2582                         return false;
2583                 sector->deleteBlock(block);
2584         }
2585
2586         return true;
2587 }
2588
2589 void ServerMap::PrintInfo(std::ostream &out)
2590 {
2591         out<<"ServerMap: ";
2592 }
2593
2594 MMVManip::MMVManip(Map *map):
2595                 VoxelManipulator(),
2596                 m_is_dirty(false),
2597                 m_create_area(false),
2598                 m_map(map)
2599 {
2600 }
2601
2602 MMVManip::~MMVManip()
2603 {
2604 }
2605
2606 void MMVManip::initialEmerge(v3s16 blockpos_min, v3s16 blockpos_max,
2607         bool load_if_inexistent)
2608 {
2609         TimeTaker timer1("initialEmerge", &emerge_time);
2610
2611         // Units of these are MapBlocks
2612         v3s16 p_min = blockpos_min;
2613         v3s16 p_max = blockpos_max;
2614
2615         VoxelArea block_area_nodes
2616                         (p_min*MAP_BLOCKSIZE, (p_max+1)*MAP_BLOCKSIZE-v3s16(1,1,1));
2617
2618         u32 size_MB = block_area_nodes.getVolume()*4/1000000;
2619         if(size_MB >= 1)
2620         {
2621                 infostream<<"initialEmerge: area: ";
2622                 block_area_nodes.print(infostream);
2623                 infostream<<" ("<<size_MB<<"MB)";
2624                 infostream<<std::endl;
2625         }
2626
2627         addArea(block_area_nodes);
2628
2629         for(s32 z=p_min.Z; z<=p_max.Z; z++)
2630         for(s32 y=p_min.Y; y<=p_max.Y; y++)
2631         for(s32 x=p_min.X; x<=p_max.X; x++)
2632         {
2633                 u8 flags = 0;
2634                 MapBlock *block;
2635                 v3s16 p(x,y,z);
2636                 std::map<v3s16, u8>::iterator n;
2637                 n = m_loaded_blocks.find(p);
2638                 if(n != m_loaded_blocks.end())
2639                         continue;
2640
2641                 bool block_data_inexistent = false;
2642                 try
2643                 {
2644                         TimeTaker timer1("emerge load", &emerge_load_time);
2645
2646                         block = m_map->getBlockNoCreate(p);
2647                         if(block->isDummy())
2648                                 block_data_inexistent = true;
2649                         else
2650                                 block->copyTo(*this);
2651                 }
2652                 catch(InvalidPositionException &e)
2653                 {
2654                         block_data_inexistent = true;
2655                 }
2656
2657                 if(block_data_inexistent)
2658                 {
2659
2660                         if (load_if_inexistent && !blockpos_over_max_limit(p)) {
2661                                 ServerMap *svrmap = (ServerMap *)m_map;
2662                                 block = svrmap->emergeBlock(p, false);
2663                                 if (block == NULL)
2664                                         block = svrmap->createBlock(p);
2665                                 block->copyTo(*this);
2666                         } else {
2667                                 flags |= VMANIP_BLOCK_DATA_INEXIST;
2668
2669                                 /*
2670                                         Mark area inexistent
2671                                 */
2672                                 VoxelArea a(p*MAP_BLOCKSIZE, (p+1)*MAP_BLOCKSIZE-v3s16(1,1,1));
2673                                 // Fill with VOXELFLAG_NO_DATA
2674                                 for(s32 z=a.MinEdge.Z; z<=a.MaxEdge.Z; z++)
2675                                 for(s32 y=a.MinEdge.Y; y<=a.MaxEdge.Y; y++)
2676                                 {
2677                                         s32 i = m_area.index(a.MinEdge.X,y,z);
2678                                         memset(&m_flags[i], VOXELFLAG_NO_DATA, MAP_BLOCKSIZE);
2679                                 }
2680                         }
2681                 }
2682                 /*else if (block->getNode(0, 0, 0).getContent() == CONTENT_IGNORE)
2683                 {
2684                         // Mark that block was loaded as blank
2685                         flags |= VMANIP_BLOCK_CONTAINS_CIGNORE;
2686                 }*/
2687
2688                 m_loaded_blocks[p] = flags;
2689         }
2690
2691         m_is_dirty = false;
2692 }
2693
2694 void MMVManip::blitBackAll(std::map<v3s16, MapBlock*> *modified_blocks,
2695         bool overwrite_generated)
2696 {
2697         if(m_area.getExtent() == v3s16(0,0,0))
2698                 return;
2699
2700         /*
2701                 Copy data of all blocks
2702         */
2703         for(std::map<v3s16, u8>::iterator
2704                         i = m_loaded_blocks.begin();
2705                         i != m_loaded_blocks.end(); ++i)
2706         {
2707                 v3s16 p = i->first;
2708                 MapBlock *block = m_map->getBlockNoCreateNoEx(p);
2709                 bool existed = !(i->second & VMANIP_BLOCK_DATA_INEXIST);
2710                 if ((existed == false) || (block == NULL) ||
2711                         (overwrite_generated == false && block->isGenerated() == true))
2712                         continue;
2713
2714                 block->copyFrom(*this);
2715
2716                 if(modified_blocks)
2717                         (*modified_blocks)[p] = block;
2718         }
2719 }
2720
2721 //END