src/mapblock.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 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 "mapblock.h"
  21
  22 #include <sstream>
  23 #include "map.h"
  24 // For g_settings
  25 #include "main.h"
  26 #include "light.h"
  27 #include "nodedef.h"
  28 #include "nodemetadata.h"
  29 #include "gamedef.h"
  30 #include "log.h"
  31 #include "nameidmapping.h"
  32 #include "content_mapnode.h" // For legacy name-id mapping
  33 #include "content_nodemeta.h" // For legacy deserialization
  34 #ifndef SERVER
  35 #include "mapblock_mesh.h"
  36 #endif
  37 #include "util/string.h"
  38 #include "util/serialize.h"
  39
  40 #define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
  41
  42 /*
  43         MapBlock
  44 */
  45
  46 MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
  47                 m_parent(parent),
  48                 m_pos(pos),
  49                 m_gamedef(gamedef),
  50                 m_modified(MOD_STATE_WRITE_NEEDED),
  51                 m_modified_reason("initial"),
  52                 m_modified_reason_too_long(false),
  53                 is_underground(false),
  54                 m_lighting_expired(true),
  55                 m_day_night_differs(false),
  56                 m_day_night_differs_expired(true),
  57                 m_generated(false),
  58                 m_timestamp(BLOCK_TIMESTAMP_UNDEFINED),
  59                 m_disk_timestamp(BLOCK_TIMESTAMP_UNDEFINED),
  60                 m_usage_timer(0),
  61                 m_refcount(0),
  62                 heat_time(0),
  63                 heat(0),
  64                 humidity_time(0),
  65                 humidity(0)
  66 {
  67         data = NULL;
  68         if(dummy == false)
  69                 reallocate();
  70
  71 #ifndef SERVER
  72         //mesh_mutex.Init();
  73         mesh = NULL;
  74 #endif
  75 }
  76
  77 MapBlock::~MapBlock()
  78 {
  79 #ifndef SERVER
  80         {
  81                 //JMutexAutoLock lock(mesh_mutex);
  82
  83                 if(mesh)
  84                 {
  85                         delete mesh;
  86                         mesh = NULL;
  87                 }
  88         }
  89 #endif
  90
  91         if(data)
  92                 delete[] data;
  93 }
  94
  95 bool MapBlock::isValidPositionParent(v3s16 p)
  96 {
  97         if(isValidPosition(p))
  98         {
  99                 return true;
 100         }
 101         else{
 102                 return m_parent->isValidPosition(getPosRelative() + p);
 103         }
 104 }
 105
 106 MapNode MapBlock::getNodeParent(v3s16 p)
 107 {
 108         if(isValidPosition(p) == false)
 109         {
 110                 return m_parent->getNode(getPosRelative() + p);
 111         }
 112         else
 113         {
 114                 if(data == NULL)
 115                         throw InvalidPositionException();
 116                 return data[p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X];
 117         }
 118 }
 119
 120 void MapBlock::setNodeParent(v3s16 p, MapNode & n)
 121 {
 122         if(isValidPosition(p) == false)
 123         {
 124                 m_parent->setNode(getPosRelative() + p, n);
 125         }
 126         else
 127         {
 128                 if(data == NULL)
 129                         throw InvalidPositionException();
 130                 data[p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X] = n;
 131         }
 132 }
 133
 134 MapNode MapBlock::getNodeParentNoEx(v3s16 p)
 135 {
 136         if(isValidPosition(p) == false)
 137         {
 138                 try{
 139                         return m_parent->getNode(getPosRelative() + p);
 140                 }
 141                 catch(InvalidPositionException &e)
 142                 {
 143                         return MapNode(CONTENT_IGNORE);
 144                 }
 145         }
 146         else
 147         {
 148                 if(data == NULL)
 149                 {
 150                         return MapNode(CONTENT_IGNORE);
 151                 }
 152                 return data[p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X];
 153         }
 154 }
 155
 156 /*
 157         Propagates sunlight down through the block.
 158         Doesn't modify nodes that are not affected by sunlight.
 159
 160         Returns false if sunlight at bottom block is invalid.
 161         Returns true if sunlight at bottom block is valid.
 162         Returns true if bottom block doesn't exist.
 163
 164         If there is a block above, continues from it.
 165         If there is no block above, assumes there is sunlight, unless
 166         is_underground is set or highest node is water.
 167
 168         All sunlighted nodes are added to light_sources.
 169
 170         if remove_light==true, sets non-sunlighted nodes black.
 171
 172         if black_air_left!=NULL, it is set to true if non-sunlighted
 173         air is left in block.
 174 */
 175 bool MapBlock::propagateSunlight(std::set<v3s16> & light_sources,
 176                 bool remove_light, bool *black_air_left)
 177 {
 178         INodeDefManager *nodemgr = m_gamedef->ndef();
 179
 180         // Whether the sunlight at the top of the bottom block is valid
 181         bool block_below_is_valid = true;
 182
 183         v3s16 pos_relative = getPosRelative();
 184
 185         for(s16 x=0; x<MAP_BLOCKSIZE; x++)
 186         {
 187                 for(s16 z=0; z<MAP_BLOCKSIZE; z++)
 188                 {
 189 #if 1
 190                         bool no_sunlight = false;
 191                         bool no_top_block = false;
 192                         // Check if node above block has sunlight
 193                         try{
 194                                 MapNode n = getNodeParent(v3s16(x, MAP_BLOCKSIZE, z));
 195                                 if(n.getContent() == CONTENT_IGNORE)
 196                                 {
 197                                         // Trust heuristics
 198                                         no_sunlight = is_underground;
 199                                 }
 200                                 else if(n.getLight(LIGHTBANK_DAY, m_gamedef->ndef()) != LIGHT_SUN)
 201                                 {
 202                                         no_sunlight = true;
 203                                 }
 204                         }
 205                         catch(InvalidPositionException &e)
 206                         {
 207                                 no_top_block = true;
 208
 209                                 // NOTE: This makes over-ground roofed places sunlighted
 210                                 // Assume sunlight, unless is_underground==true
 211                                 if(is_underground)
 212                                 {
 213                                         no_sunlight = true;
 214                                 }
 215                                 else
 216                                 {
 217                                         MapNode n = getNode(v3s16(x, MAP_BLOCKSIZE-1, z));
 218                                         if(m_gamedef->ndef()->get(n).sunlight_propagates == false)
 219                                         {
 220                                                 no_sunlight = true;
 221                                         }
 222                                 }
 223                                 // NOTE: As of now, this just would make everything dark.
 224                                 // No sunlight here
 225                                 //no_sunlight = true;
 226                         }
 227 #endif
 228 #if 0 // Doesn't work; nothing gets light.
 229                         bool no_sunlight = true;
 230                         bool no_top_block = false;
 231                         // Check if node above block has sunlight
 232                         try{
 233                                 MapNode n = getNodeParent(v3s16(x, MAP_BLOCKSIZE, z));
 234                                 if(n.getLight(LIGHTBANK_DAY) == LIGHT_SUN)
 235                                 {
 236                                         no_sunlight = false;
 237                                 }
 238                         }
 239                         catch(InvalidPositionException &e)
 240                         {
 241                                 no_top_block = true;
 242                         }
 243 #endif
 244
 245                         /*std::cout<<"("<<x<<","<<z<<"): "
 246                                         <<"no_top_block="<<no_top_block
 247                                         <<", is_underground="<<is_underground
 248                                         <<", no_sunlight="<<no_sunlight
 249                                         <<std::endl;*/
 250
 251                         s16 y = MAP_BLOCKSIZE-1;
 252
 253                         // This makes difference to diminishing in water.
 254                         bool stopped_to_solid_object = false;
 255
 256                         u8 current_light = no_sunlight ? 0 : LIGHT_SUN;
 257
 258                         for(; y >= 0; y--)
 259                         {
 260                                 v3s16 pos(x, y, z);
 261                                 MapNode &n = getNodeRef(pos);
 262
 263                                 if(current_light == 0)
 264                                 {
 265                                         // Do nothing
 266                                 }
 267                                 else if(current_light == LIGHT_SUN && nodemgr->get(n).sunlight_propagates)
 268                                 {
 269                                         // Do nothing: Sunlight is continued
 270                                 }
 271                                 else if(nodemgr->get(n).light_propagates == false)
 272                                 {
 273                                         // A solid object is on the way.
 274                                         stopped_to_solid_object = true;
 275
 276                                         // Light stops.
 277                                         current_light = 0;
 278                                 }
 279                                 else
 280                                 {
 281                                         // Diminish light
 282                                         current_light = diminish_light(current_light);
 283                                 }
 284
 285                                 u8 old_light = n.getLight(LIGHTBANK_DAY, nodemgr);
 286
 287                                 if(current_light > old_light || remove_light)
 288                                 {
 289                                         n.setLight(LIGHTBANK_DAY, current_light, nodemgr);
 290                                 }
 291
 292                                 if(diminish_light(current_light) != 0)
 293                                 {
 294                                         light_sources.insert(pos_relative + pos);
 295                                 }
 296
 297                                 if(current_light == 0 && stopped_to_solid_object)
 298                                 {
 299                                         if(black_air_left)
 300                                         {
 301                                                 *black_air_left = true;
 302                                         }
 303                                 }
 304                         }
 305
 306                         // Whether or not the block below should see LIGHT_SUN
 307                         bool sunlight_should_go_down = (current_light == LIGHT_SUN);
 308
 309                         /*
 310                                 If the block below hasn't already been marked invalid:
 311
 312                                 Check if the node below the block has proper sunlight at top.
 313                                 If not, the block below is invalid.
 314
 315                                 Ignore non-transparent nodes as they always have no light
 316                         */
 317                         try
 318                         {
 319                         if(block_below_is_valid)
 320                         {
 321                                 MapNode n = getNodeParent(v3s16(x, -1, z));
 322                                 if(nodemgr->get(n).light_propagates)
 323                                 {
 324                                         if(n.getLight(LIGHTBANK_DAY, nodemgr) == LIGHT_SUN
 325                                                         && sunlight_should_go_down == false)
 326                                                 block_below_is_valid = false;
 327                                         else if(n.getLight(LIGHTBANK_DAY, nodemgr) != LIGHT_SUN
 328                                                         && sunlight_should_go_down == true)
 329                                                 block_below_is_valid = false;
 330                                 }
 331                         }//if
 332                         }//try
 333                         catch(InvalidPositionException &e)
 334                         {
 335                                 /*std::cout<<"InvalidBlockException for bottom block node"
 336                                                 <<std::endl;*/
 337                                 // Just no block below, no need to panic.
 338                         }
 339                 }
 340         }
 341
 342         return block_below_is_valid;
 343 }
 344
 345
 346 void MapBlock::copyTo(VoxelManipulator &dst)
 347 {
 348         v3s16 data_size(MAP_BLOCKSIZE, MAP_BLOCKSIZE, MAP_BLOCKSIZE);
 349         VoxelArea data_area(v3s16(0,0,0), data_size - v3s16(1,1,1));
 350
 351         // Copy from data to VoxelManipulator
 352         dst.copyFrom(data, data_area, v3s16(0,0,0),
 353                         getPosRelative(), data_size);
 354 }
 355
 356 void MapBlock::copyFrom(VoxelManipulator &dst)
 357 {
 358         v3s16 data_size(MAP_BLOCKSIZE, MAP_BLOCKSIZE, MAP_BLOCKSIZE);
 359         VoxelArea data_area(v3s16(0,0,0), data_size - v3s16(1,1,1));
 360
 361         // Copy from VoxelManipulator to data
 362         dst.copyTo(data, data_area, v3s16(0,0,0),
 363                         getPosRelative(), data_size);
 364 }
 365
 366 void MapBlock::actuallyUpdateDayNightDiff()
 367 {
 368         INodeDefManager *nodemgr = m_gamedef->ndef();
 369         // Running this function un-expires m_day_night_differs
 370         m_day_night_differs_expired = false;
 371
 372         if(data == NULL)
 373         {
 374                 m_day_night_differs = false;
 375                 return;
 376         }
 377
 378         bool differs = false;
 379
 380         /*
 381                 Check if any lighting value differs
 382         */
 383         for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
 384         {
 385                 MapNode &n = data[i];
 386                 if(n.getLight(LIGHTBANK_DAY, nodemgr) != n.getLight(LIGHTBANK_NIGHT, nodemgr))
 387                 {
 388                         differs = true;
 389                         break;
 390                 }
 391         }
 392
 393         /*
 394                 If some lighting values differ, check if the whole thing is
 395                 just air. If it is, differ = false
 396         */
 397         if(differs)
 398         {
 399                 bool only_air = true;
 400                 for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
 401                 {
 402                         MapNode &n = data[i];
 403                         if(n.getContent() != CONTENT_AIR)
 404                         {
 405                                 only_air = false;
 406                                 break;
 407                         }
 408                 }
 409                 if(only_air)
 410                         differs = false;
 411         }
 412
 413         // Set member variable
 414         m_day_night_differs = differs;
 415 }
 416
 417 void MapBlock::expireDayNightDiff()
 418 {
 419         //INodeDefManager *nodemgr = m_gamedef->ndef();
 420
 421         if(data == NULL){
 422                 m_day_night_differs = false;
 423                 m_day_night_differs_expired = false;
 424                 return;
 425         }
 426
 427         m_day_night_differs_expired = true;
 428 }
 429
 430 s16 MapBlock::getGroundLevel(v2s16 p2d)
 431 {
 432         if(isDummy())
 433                 return -3;
 434         try
 435         {
 436                 s16 y = MAP_BLOCKSIZE-1;
 437                 for(; y>=0; y--)
 438                 {
 439                         MapNode n = getNodeRef(p2d.X, y, p2d.Y);
 440                         if(m_gamedef->ndef()->get(n).walkable)
 441                         {
 442                                 if(y == MAP_BLOCKSIZE-1)
 443                                         return -2;
 444                                 else
 445                                         return y;
 446                         }
 447                 }
 448                 return -1;
 449         }
 450         catch(InvalidPositionException &e)
 451         {
 452                 return -3;
 453         }
 454 }
 455
 456 /*
 457         Serialization
 458 */
 459 // List relevant id-name pairs for ids in the block using nodedef
 460 // Renumbers the content IDs (starting at 0 and incrementing
 461 static void getBlockNodeIdMapping(NameIdMapping *nimap, MapNode *nodes,
 462                 INodeDefManager *nodedef)
 463 {
 464         std::map<content_t, content_t> mapping;
 465         std::set<content_t> unknown_contents;
 466         content_t id_counter = 0;
 467         for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
 468         {
 469                 content_t global_id = nodes[i].getContent();
 470                 content_t id = CONTENT_IGNORE;
 471
 472                 // Try to find an existing mapping
 473                 std::map<content_t, content_t>::iterator j = mapping.find(global_id);
 474                 if(j != mapping.end())
 475                 {
 476                         id = j->second;
 477                 }
 478                 else
 479                 {
 480                         // We have to assign a new mapping
 481                         id = id_counter++;
 482                         mapping.insert(std::make_pair(global_id, id));
 483
 484                         const ContentFeatures &f = nodedef->get(global_id);
 485                         const std::string &name = f.name;
 486                         if(name == "")
 487                                 unknown_contents.insert(global_id);
 488                         else
 489                                 nimap->set(id, name);
 490                 }
 491
 492                 // Update the MapNode
 493                 nodes[i].setContent(id);
 494         }
 495         for(std::set<content_t>::const_iterator
 496                         i = unknown_contents.begin();
 497                         i != unknown_contents.end(); i++){
 498                 errorstream<<"getBlockNodeIdMapping(): IGNORING ERROR: "
 499                                 <<"Name for node id "<<(*i)<<" not known"<<std::endl;
 500         }
 501 }
 502 // Correct ids in the block to match nodedef based on names.
 503 // Unknown ones are added to nodedef.
 504 // Will not update itself to match id-name pairs in nodedef.
 505 static void correctBlockNodeIds(const NameIdMapping *nimap, MapNode *nodes,
 506                 IGameDef *gamedef)
 507 {
 508         INodeDefManager *nodedef = gamedef->ndef();
 509         // This means the block contains incorrect ids, and we contain
 510         // the information to convert those to names.
 511         // nodedef contains information to convert our names to globally
 512         // correct ids.
 513         std::set<content_t> unnamed_contents;
 514         std::set<std::string> unallocatable_contents;
 515         for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
 516         {
 517                 content_t local_id = nodes[i].getContent();
 518                 std::string name;
 519                 bool found = nimap->getName(local_id, name);
 520                 if(!found){
 521                         unnamed_contents.insert(local_id);
 522                         continue;
 523                 }
 524                 content_t global_id;
 525                 found = nodedef->getId(name, global_id);
 526                 if(!found){
 527                         global_id = gamedef->allocateUnknownNodeId(name);
 528                         if(global_id == CONTENT_IGNORE){
 529                                 unallocatable_contents.insert(name);
 530                                 continue;
 531                         }
 532                 }
 533                 nodes[i].setContent(global_id);
 534         }
 535         for(std::set<content_t>::const_iterator
 536                         i = unnamed_contents.begin();
 537                         i != unnamed_contents.end(); i++){
 538                 errorstream<<"correctBlockNodeIds(): IGNORING ERROR: "
 539                                 <<"Block contains id "<<(*i)
 540                                 <<" with no name mapping"<<std::endl;
 541         }
 542         for(std::set<std::string>::const_iterator
 543                         i = unallocatable_contents.begin();
 544                         i != unallocatable_contents.end(); i++){
 545                 errorstream<<"correctBlockNodeIds(): IGNORING ERROR: "
 546                                 <<"Could not allocate global id for node name \""
 547                                 <<(*i)<<"\""<<std::endl;
 548         }
 549 }
 550
 551 void MapBlock::serialize(std::ostream &os, u8 version, bool disk)
 552 {
 553         if(!ser_ver_supported(version))
 554                 throw VersionMismatchException("ERROR: MapBlock format not supported");
 555
 556         if(data == NULL)
 557         {
 558                 throw SerializationError("ERROR: Not writing dummy block.");
 559         }
 560
 561         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 562         // in memory; conversion just won't work in this direction.
 563         if(version < 24)
 564                 throw SerializationError("MapBlock::serialize: serialization to "
 565                                 "version < 24 not possible");
 566
 567         // First byte
 568         u8 flags = 0;
 569         if(is_underground)
 570                 flags |= 0x01;
 571         if(getDayNightDiff())
 572                 flags |= 0x02;
 573         if(m_lighting_expired)
 574                 flags |= 0x04;
 575         if(m_generated == false)
 576                 flags |= 0x08;
 577         writeU8(os, flags);
 578
 579         /*
 580                 Bulk node data
 581         */
 582         NameIdMapping nimap;
 583         u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
 584         if(disk)
 585         {
 586                 MapNode *tmp_nodes = new MapNode[nodecount];
 587                 for(u32 i=0; i<nodecount; i++)
 588                         tmp_nodes[i] = data[i];
 589                 getBlockNodeIdMapping(&nimap, tmp_nodes, m_gamedef->ndef());
 590
 591                 u8 content_width = 2;
 592                 u8 params_width = 2;
 593                 writeU8(os, content_width);
 594                 writeU8(os, params_width);
 595                 MapNode::serializeBulk(os, version, tmp_nodes, nodecount,
 596                                 content_width, params_width, true);
 597                 delete[] tmp_nodes;
 598         }
 599         else
 600         {
 601                 u8 content_width = 2;
 602                 u8 params_width = 2;
 603                 writeU8(os, content_width);
 604                 writeU8(os, params_width);
 605                 MapNode::serializeBulk(os, version, data, nodecount,
 606                                 content_width, params_width, true);
 607         }
 608
 609         /*
 610                 Node metadata
 611         */
 612         std::ostringstream oss(std::ios_base::binary);
 613         m_node_metadata.serialize(oss);
 614         compressZlib(oss.str(), os);
 615
 616         /*
 617                 Data that goes to disk, but not the network
 618         */
 619         if(disk)
 620         {
 621                 if(version <= 24){
 622                         // Node timers
 623                         m_node_timers.serialize(os, version);
 624                 }
 625
 626                 // Static objects
 627                 m_static_objects.serialize(os);
 628
 629                 // Timestamp
 630                 writeU32(os, getTimestamp());
 631
 632                 // Write block-specific node definition id mapping
 633                 nimap.serialize(os);
 634
 635                 if(version >= 25){
 636                         // Node timers
 637                         m_node_timers.serialize(os, version);
 638                 }
 639         } else {
 640                 if(version >= 26){
 641                         writeF1000(os, heat);
 642                         writeF1000(os, humidity);
 643                 }
 644         }
 645 }
 646
 647 void MapBlock::deSerialize(std::istream &is, u8 version, bool disk)
 648 {
 649         if(!ser_ver_supported(version))
 650                 throw VersionMismatchException("ERROR: MapBlock format not supported");
 651
 652         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())<<std::endl);
 653
 654         m_day_night_differs_expired = false;
 655
 656         if(version <= 21)
 657         {
 658                 deSerialize_pre22(is, version, disk);
 659                 return;
 660         }
 661
 662         u8 flags = readU8(is);
 663         is_underground = (flags & 0x01) ? true : false;
 664         m_day_night_differs = (flags & 0x02) ? true : false;
 665         m_lighting_expired = (flags & 0x04) ? true : false;
 666         m_generated = (flags & 0x08) ? false : true;
 667
 668         /*
 669                 Bulk node data
 670         */
 671         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 672                         <<": Bulk node data"<<std::endl);
 673         u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
 674         u8 content_width = readU8(is);
 675         u8 params_width = readU8(is);
 676         if(content_width != 1 && content_width != 2)
 677                 throw SerializationError("MapBlock::deSerialize(): invalid content_width");
 678         if(params_width != 2)
 679                 throw SerializationError("MapBlock::deSerialize(): invalid params_width");
 680         MapNode::deSerializeBulk(is, version, data, nodecount,
 681                         content_width, params_width, true);
 682
 683         /*
 684                 NodeMetadata
 685         */
 686         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 687                         <<": Node metadata"<<std::endl);
 688         // Ignore errors
 689         try{
 690                 std::ostringstream oss(std::ios_base::binary);
 691                 decompressZlib(is, oss);
 692                 std::istringstream iss(oss.str(), std::ios_base::binary);
 693                 if(version >= 23)
 694                         m_node_metadata.deSerialize(iss, m_gamedef);
 695                 else
 696                         content_nodemeta_deserialize_legacy(iss,
 697                                         &m_node_metadata, &m_node_timers,
 698                                         m_gamedef);
 699         }
 700         catch(SerializationError &e)
 701         {
 702                 errorstream<<"WARNING: MapBlock::deSerialize(): Ignoring an error"
 703                                 <<" while deserializing node metadata at ("
 704                                 <<PP(getPos())<<": "<<e.what()<<std::endl;
 705         }
 706
 707         /*
 708                 Data that is only on disk
 709         */
 710         if(disk)
 711         {
 712                 // Node timers
 713                 if(version == 23){
 714                         // Read unused zero
 715                         readU8(is);
 716                 }
 717                 if(version == 24){
 718                         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 719                                         <<": Node timers (ver==24)"<<std::endl);
 720                         m_node_timers.deSerialize(is, version);
 721                 }
 722
 723                 // Static objects
 724                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 725                                 <<": Static objects"<<std::endl);
 726                 m_static_objects.deSerialize(is);
 727
 728                 // Timestamp
 729                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 730                                 <<": Timestamp"<<std::endl);
 731                 setTimestamp(readU32(is));
 732                 m_disk_timestamp = m_timestamp;
 733
 734                 // Dynamically re-set ids based on node names
 735                 TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 736                                 <<": NameIdMapping"<<std::endl);
 737                 NameIdMapping nimap;
 738                 nimap.deSerialize(is);
 739                 correctBlockNodeIds(&nimap, data, m_gamedef);
 740
 741                 if(version >= 25){
 742                         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 743                                         <<": Node timers (ver>=25)"<<std::endl);
 744                         m_node_timers.deSerialize(is, version);
 745                 }
 746         } else {
 747                 if(version >= 26){
 748                         heat = readF1000(is);
 749                         humidity = readF1000(is);
 750                 }
 751         }
 752
 753         TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
 754                         <<": Done."<<std::endl);
 755 }
 756
 757 /*
 758         Legacy serialization
 759 */
 760
 761 void MapBlock::deSerialize_pre22(std::istream &is, u8 version, bool disk)
 762 {
 763         u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
 764
 765         // Initialize default flags
 766         is_underground = false;
 767         m_day_night_differs = false;
 768         m_lighting_expired = false;
 769         m_generated = true;
 770
 771         // Make a temporary buffer
 772         u32 ser_length = MapNode::serializedLength(version);
 773         SharedBuffer<u8> databuf_nodelist(nodecount * ser_length);
 774
 775         // These have no compression
 776         if(version <= 3 || version == 5 || version == 6)
 777         {
 778                 char tmp;
 779                 is.read(&tmp, 1);
 780                 if(is.gcount() != 1)
 781                         throw SerializationError
 782                                         ("MapBlock::deSerialize: no enough input data");
 783                 is_underground = tmp;
 784                 is.read((char*)*databuf_nodelist, nodecount * ser_length);
 785                 if((u32)is.gcount() != nodecount * ser_length)
 786                         throw SerializationError
 787                                         ("MapBlock::deSerialize: no enough input data");
 788         }
 789         else if(version <= 10)
 790         {
 791                 u8 t8;
 792                 is.read((char*)&t8, 1);
 793                 is_underground = t8;
 794
 795                 {
 796                         // Uncompress and set material data
 797                         std::ostringstream os(std::ios_base::binary);
 798                         decompress(is, os, version);
 799                         std::string s = os.str();
 800                         if(s.size() != nodecount)
 801                                 throw SerializationError
 802                                                 ("MapBlock::deSerialize: invalid format");
 803                         for(u32 i=0; i<s.size(); i++)
 804                         {
 805                                 databuf_nodelist[i*ser_length] = s[i];
 806                         }
 807                 }
 808                 {
 809                         // Uncompress and set param data
 810                         std::ostringstream os(std::ios_base::binary);
 811                         decompress(is, os, version);
 812                         std::string s = os.str();
 813                         if(s.size() != nodecount)
 814                                 throw SerializationError
 815                                                 ("MapBlock::deSerialize: invalid format");
 816                         for(u32 i=0; i<s.size(); i++)
 817                         {
 818                                 databuf_nodelist[i*ser_length + 1] = s[i];
 819                         }
 820                 }
 821
 822                 if(version >= 10)
 823                 {
 824                         // Uncompress and set param2 data
 825                         std::ostringstream os(std::ios_base::binary);
 826                         decompress(is, os, version);
 827                         std::string s = os.str();
 828                         if(s.size() != nodecount)
 829                                 throw SerializationError
 830                                                 ("MapBlock::deSerialize: invalid format");
 831                         for(u32 i=0; i<s.size(); i++)
 832                         {
 833                                 databuf_nodelist[i*ser_length + 2] = s[i];
 834                         }
 835                 }
 836         }
 837         // All other versions (newest)
 838         else
 839         {
 840                 u8 flags;
 841                 is.read((char*)&flags, 1);
 842                 is_underground = (flags & 0x01) ? true : false;
 843                 m_day_night_differs = (flags & 0x02) ? true : false;
 844                 m_lighting_expired = (flags & 0x04) ? true : false;
 845                 if(version >= 18)
 846                         m_generated = (flags & 0x08) ? false : true;
 847
 848                 // Uncompress data
 849                 std::ostringstream os(std::ios_base::binary);
 850                 decompress(is, os, version);
 851                 std::string s = os.str();
 852                 if(s.size() != nodecount*3)
 853                         throw SerializationError
 854                                         ("MapBlock::deSerialize: decompress resulted in size"
 855                                         " other than nodecount*3");
 856
 857                 // deserialize nodes from buffer
 858                 for(u32 i=0; i<nodecount; i++)
 859                 {
 860                         databuf_nodelist[i*ser_length] = s[i];
 861                         databuf_nodelist[i*ser_length + 1] = s[i+nodecount];
 862                         databuf_nodelist[i*ser_length + 2] = s[i+nodecount*2];
 863                 }
 864
 865                 /*
 866                         NodeMetadata
 867                 */
 868                 if(version >= 14)
 869                 {
 870                         // Ignore errors
 871                         try{
 872                                 if(version <= 15)
 873                                 {
 874                                         std::string data = deSerializeString(is);
 875                                         std::istringstream iss(data, std::ios_base::binary);
 876                                         content_nodemeta_deserialize_legacy(iss,
 877                                                         &m_node_metadata, &m_node_timers,
 878                                                         m_gamedef);
 879                                 }
 880                                 else
 881                                 {
 882                                         //std::string data = deSerializeLongString(is);
 883                                         std::ostringstream oss(std::ios_base::binary);
 884                                         decompressZlib(is, oss);
 885                                         std::istringstream iss(oss.str(), std::ios_base::binary);
 886                                         content_nodemeta_deserialize_legacy(iss,
 887                                                         &m_node_metadata, &m_node_timers,
 888                                                         m_gamedef);
 889                                 }
 890                         }
 891                         catch(SerializationError &e)
 892                         {
 893                                 errorstream<<"WARNING: MapBlock::deSerialize(): Ignoring an error"
 894                                                 <<" while deserializing node metadata"<<std::endl;
 895                         }
 896                 }
 897         }
 898
 899         // Deserialize node data
 900         for(u32 i=0; i<nodecount; i++)
 901         {
 902                 data[i].deSerialize(&databuf_nodelist[i*ser_length], version);
 903         }
 904
 905         if(disk)
 906         {
 907                 /*
 908                         Versions up from 9 have block objects. (DEPRECATED)
 909                 */
 910                 if(version >= 9){
 911                         u16 count = readU16(is);
 912                         // Not supported and length not known if count is not 0
 913                         if(count != 0){
 914                                 errorstream<<"WARNING: MapBlock::deSerialize_pre22(): "
 915                                                 <<"Ignoring stuff coming at and after MBOs"<<std::endl;
 916                                 return;
 917                         }
 918                 }
 919
 920                 /*
 921                         Versions up from 15 have static objects.
 922                 */
 923                 if(version >= 15)
 924                         m_static_objects.deSerialize(is);
 925
 926                 // Timestamp
 927                 if(version >= 17){
 928                         setTimestamp(readU32(is));
 929                         m_disk_timestamp = m_timestamp;
 930                 } else {
 931                         setTimestamp(BLOCK_TIMESTAMP_UNDEFINED);
 932                 }
 933
 934                 // Dynamically re-set ids based on node names
 935                 NameIdMapping nimap;
 936                 // If supported, read node definition id mapping
 937                 if(version >= 21){
 938                         nimap.deSerialize(is);
 939                 // Else set the legacy mapping
 940                 } else {
 941                         content_mapnode_get_name_id_mapping(&nimap);
 942                 }
 943                 correctBlockNodeIds(&nimap, data, m_gamedef);
 944         }
 945
 946
 947         // Legacy data changes
 948         // This code has to convert from pre-22 to post-22 format.
 949         INodeDefManager *nodedef = m_gamedef->ndef();
 950         for(u32 i=0; i<nodecount; i++)
 951         {
 952                 const ContentFeatures &f = nodedef->get(data[i].getContent());
 953                 // Mineral
 954                 if(nodedef->getId("default:stone") == data[i].getContent()
 955                                 && data[i].getParam1() == 1)
 956                 {
 957                         data[i].setContent(nodedef->getId("default:stone_with_coal"));
 958                         data[i].setParam1(0);
 959                 }
 960                 else if(nodedef->getId("default:stone") == data[i].getContent()
 961                                 && data[i].getParam1() == 2)
 962                 {
 963                         data[i].setContent(nodedef->getId("default:stone_with_iron"));
 964                         data[i].setParam1(0);
 965                 }
 966                 // facedir_simple
 967                 if(f.legacy_facedir_simple)
 968                 {
 969                         data[i].setParam2(data[i].getParam1());
 970                         data[i].setParam1(0);
 971                 }
 972                 // wall_mounted
 973                 if(f.legacy_wallmounted)
 974                 {
 975                         u8 wallmounted_new_to_old[8] = {0x04, 0x08, 0x01, 0x02, 0x10, 0x20, 0, 0};
 976                         u8 dir_old_format = data[i].getParam2();
 977                         u8 dir_new_format = 0;
 978                         for(u8 j=0; j<8; j++)
 979                         {
 980                                 if((dir_old_format & wallmounted_new_to_old[j]) != 0)
 981                                 {
 982                                         dir_new_format = j;
 983                                         break;
 984                                 }
 985                         }
 986                         data[i].setParam2(dir_new_format);
 987                 }
 988         }
 989
 990 }
 991
 992 /*
 993         Get a quick string to describe what a block actually contains
 994 */
 995 std::string analyze_block(MapBlock *block)
 996 {
 997         if(block == NULL)
 998                 return "NULL";
 999
1000         std::ostringstream desc;
1001
1002         v3s16 p = block->getPos();
1003         char spos[20];
1004         snprintf(spos, 20, "(%2d,%2d,%2d), ", p.X, p.Y, p.Z);
1005         desc<<spos;
1006
1007         switch(block->getModified())
1008         {
1009         case MOD_STATE_CLEAN:
1010                 desc<<"CLEAN,           ";
1011                 break;
1012         case MOD_STATE_WRITE_AT_UNLOAD:
1013                 desc<<"WRITE_AT_UNLOAD, ";
1014                 break;
1015         case MOD_STATE_WRITE_NEEDED:
1016                 desc<<"WRITE_NEEDED,    ";
1017                 break;
1018         default:
1019                 desc<<"unknown getModified()="+itos(block->getModified())+", ";
1020         }
1021
1022         if(block->isGenerated())
1023                 desc<<"is_gen [X], ";
1024         else
1025                 desc<<"is_gen [ ], ";
1026
1027         if(block->getIsUnderground())
1028                 desc<<"is_ug [X], ";
1029         else
1030                 desc<<"is_ug [ ], ";
1031
1032         if(block->getLightingExpired())
1033                 desc<<"lighting_exp [X], ";
1034         else
1035                 desc<<"lighting_exp [ ], ";
1036
1037         if(block->isDummy())
1038         {
1039                 desc<<"Dummy, ";
1040         }
1041         else
1042         {
1043                 bool full_ignore = true;
1044                 bool some_ignore = false;
1045                 bool full_air = true;
1046                 bool some_air = false;
1047                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
1048                 for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
1049                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
1050                 {
1051                         v3s16 p(x0,y0,z0);
1052                         MapNode n = block->getNode(p);
1053                         content_t c = n.getContent();
1054                         if(c == CONTENT_IGNORE)
1055                                 some_ignore = true;
1056                         else
1057                                 full_ignore = false;
1058                         if(c == CONTENT_AIR)
1059                                 some_air = true;
1060                         else
1061                                 full_air = false;
1062                 }
1063
1064                 desc<<"content {";
1065
1066                 std::ostringstream ss;
1067
1068                 if(full_ignore)
1069                         ss<<"IGNORE (full), ";
1070                 else if(some_ignore)
1071                         ss<<"IGNORE, ";
1072
1073                 if(full_air)
1074                         ss<<"AIR (full), ";
1075                 else if(some_air)
1076                         ss<<"AIR, ";
1077
1078                 if(ss.str().size()>=2)
1079                         desc<<ss.str().substr(0, ss.str().size()-2);
1080
1081                 desc<<"}, ";
1082         }
1083
1084         return desc.str().substr(0, desc.str().size()-2);
1085 }
1086
1087
1088 //END