src/mapnode.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 "irrlichttypes_extrabloated.h"
  21 #include "mapnode.h"
  22 #include "porting.h"
  23 #include "nodedef.h"
  24 #include "content_mapnode.h" // For mapnode_translate_*_internal
  25 #include "serialization.h" // For ser_ver_supported
  26 #include "util/serialize.h"
  27 #include "log.h"
  28 #include "util/numeric.h"
  29 #include <string>
  30 #include <sstream>
  31
  32 static const Rotation wallmounted_to_rot[] = {
  33         ROTATE_0, ROTATE_180, ROTATE_90, ROTATE_270
  34 };
  35
  36 static const u8 rot_to_wallmounted[] = {
  37         2, 4, 3, 5
  38 };
  39
  40
  41 /*
  42         MapNode
  43 */
  44
  45 // Create directly from a nodename
  46 // If name is unknown, sets CONTENT_IGNORE
  47 MapNode::MapNode(INodeDefManager *ndef, const std::string &name,
  48                 u8 a_param1, u8 a_param2)
  49 {
  50         content_t id = CONTENT_IGNORE;
  51         ndef->getId(name, id);
  52         param0 = id;
  53         param1 = a_param1;
  54         param2 = a_param2;
  55 }
  56
  57 void MapNode::setLight(enum LightBank bank, u8 a_light, INodeDefManager *nodemgr)
  58 {
  59         // If node doesn't contain light data, ignore this
  60         if(nodemgr->get(*this).param_type != CPT_LIGHT)
  61                 return;
  62         if(bank == LIGHTBANK_DAY)
  63         {
  64                 param1 &= 0xf0;
  65                 param1 |= a_light & 0x0f;
  66         }
  67         else if(bank == LIGHTBANK_NIGHT)
  68         {
  69                 param1 &= 0x0f;
  70                 param1 |= (a_light & 0x0f)<<4;
  71         }
  72         else
  73                 assert("Invalid light bank" == NULL);
  74 }
  75
  76 bool MapNode::isLightDayNightEq(INodeDefManager *nodemgr) const
  77 {
  78         const ContentFeatures &f = nodemgr->get(*this);
  79         bool isEqual;
  80
  81         if (f.param_type == CPT_LIGHT) {
  82                 u8 day   = MYMAX(f.light_source, param1 & 0x0f);
  83                 u8 night = MYMAX(f.light_source, (param1 >> 4) & 0x0f);
  84                 isEqual = day == night;
  85         } else {
  86                 isEqual = true;
  87         }
  88
  89         return isEqual;
  90 }
  91
  92 u8 MapNode::getLight(enum LightBank bank, INodeDefManager *nodemgr) const
  93 {
  94         // Select the brightest of [light source, propagated light]
  95         const ContentFeatures &f = nodemgr->get(*this);
  96
  97         u8 light;
  98         if(f.param_type == CPT_LIGHT)
  99                 light = bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f;
 100         else
 101                 light = 0;
 102
 103         return MYMAX(f.light_source, light);
 104 }
 105
 106 u8 MapNode::getLightNoChecks(enum LightBank bank, const ContentFeatures *f) const
 107 {
 108         return MYMAX(f->light_source,
 109                      bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f);
 110 }
 111
 112 bool MapNode::getLightBanks(u8 &lightday, u8 &lightnight, INodeDefManager *nodemgr) const
 113 {
 114         // Select the brightest of [light source, propagated light]
 115         const ContentFeatures &f = nodemgr->get(*this);
 116         if(f.param_type == CPT_LIGHT)
 117         {
 118                 lightday = param1 & 0x0f;
 119                 lightnight = (param1>>4)&0x0f;
 120         }
 121         else
 122         {
 123                 lightday = 0;
 124                 lightnight = 0;
 125         }
 126         if(f.light_source > lightday)
 127                 lightday = f.light_source;
 128         if(f.light_source > lightnight)
 129                 lightnight = f.light_source;
 130         return f.param_type == CPT_LIGHT || f.light_source != 0;
 131 }
 132
 133 u8 MapNode::getFaceDir(INodeDefManager *nodemgr) const
 134 {
 135         const ContentFeatures &f = nodemgr->get(*this);
 136         if(f.param_type_2 == CPT2_FACEDIR)
 137                 return (getParam2() & 0x1F) % 24;
 138         return 0;
 139 }
 140
 141 u8 MapNode::getWallMounted(INodeDefManager *nodemgr) const
 142 {
 143         const ContentFeatures &f = nodemgr->get(*this);
 144         if(f.param_type_2 == CPT2_WALLMOUNTED)
 145                 return getParam2() & 0x07;
 146         return 0;
 147 }
 148
 149 v3s16 MapNode::getWallMountedDir(INodeDefManager *nodemgr) const
 150 {
 151         switch(getWallMounted(nodemgr))
 152         {
 153         case 0: default: return v3s16(0,1,0);
 154         case 1: return v3s16(0,-1,0);
 155         case 2: return v3s16(1,0,0);
 156         case 3: return v3s16(-1,0,0);
 157         case 4: return v3s16(0,0,1);
 158         case 5: return v3s16(0,0,-1);
 159         }
 160 }
 161
 162 void MapNode::rotateAlongYAxis(INodeDefManager *nodemgr, Rotation rot) {
 163         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 164
 165         if (cpt2 == CPT2_FACEDIR) {
 166                 u8 newrot = param2 & 3;
 167                 param2 &= ~3;
 168                 param2 |= (newrot + rot) & 3;
 169         } else if (cpt2 == CPT2_WALLMOUNTED) {
 170                 u8 wmountface = (param2 & 7);
 171                 if (wmountface <= 1)
 172                         return;
 173
 174                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 175                 param2 &= ~7;
 176                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 177         }
 178 }
 179
 180 static std::vector<aabb3f> transformNodeBox(const MapNode &n,
 181                 const NodeBox &nodebox, INodeDefManager *nodemgr)
 182 {
 183         std::vector<aabb3f> boxes;
 184         if(nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED)
 185         {
 186                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 187                 int facedir = n.getFaceDir(nodemgr);
 188                 u8 axisdir = facedir>>2;
 189                 facedir&=0x03;
 190                 for(std::vector<aabb3f>::const_iterator
 191                                 i = fixed.begin();
 192                                 i != fixed.end(); i++)
 193                 {
 194                         aabb3f box = *i;
 195
 196                         if (nodebox.type == NODEBOX_LEVELED) {
 197                                 box.MaxEdge.Y = -BS/2 + BS*((float)1/LEVELED_MAX) * n.getLevel(nodemgr);
 198                         }
 199
 200                         switch (axisdir)
 201                         {
 202                         case 0:
 203                                 if(facedir == 1)
 204                                 {
 205                                         box.MinEdge.rotateXZBy(-90);
 206                                         box.MaxEdge.rotateXZBy(-90);
 207                                 }
 208                                 else if(facedir == 2)
 209                                 {
 210                                         box.MinEdge.rotateXZBy(180);
 211                                         box.MaxEdge.rotateXZBy(180);
 212                                 }
 213                                 else if(facedir == 3)
 214                                 {
 215                                         box.MinEdge.rotateXZBy(90);
 216                                         box.MaxEdge.rotateXZBy(90);
 217                                 }
 218                                 break;
 219                         case 1: // z+
 220                                 box.MinEdge.rotateYZBy(90);
 221                                 box.MaxEdge.rotateYZBy(90);
 222                                 if(facedir == 1)
 223                                 {
 224                                         box.MinEdge.rotateXYBy(90);
 225                                         box.MaxEdge.rotateXYBy(90);
 226                                 }
 227                                 else if(facedir == 2)
 228                                 {
 229                                         box.MinEdge.rotateXYBy(180);
 230                                         box.MaxEdge.rotateXYBy(180);
 231                                 }
 232                                 else if(facedir == 3)
 233                                 {
 234                                         box.MinEdge.rotateXYBy(-90);
 235                                         box.MaxEdge.rotateXYBy(-90);
 236                                 }
 237                                 break;
 238                         case 2: //z-
 239                                 box.MinEdge.rotateYZBy(-90);
 240                                 box.MaxEdge.rotateYZBy(-90);
 241                                 if(facedir == 1)
 242                                 {
 243                                         box.MinEdge.rotateXYBy(-90);
 244                                         box.MaxEdge.rotateXYBy(-90);
 245                                 }
 246                                 else if(facedir == 2)
 247                                 {
 248                                         box.MinEdge.rotateXYBy(180);
 249                                         box.MaxEdge.rotateXYBy(180);
 250                                 }
 251                                 else if(facedir == 3)
 252                                 {
 253                                         box.MinEdge.rotateXYBy(90);
 254                                         box.MaxEdge.rotateXYBy(90);
 255                                 }
 256                                 break;
 257                         case 3:  //x+
 258                                 box.MinEdge.rotateXYBy(-90);
 259                                 box.MaxEdge.rotateXYBy(-90);
 260                                 if(facedir == 1)
 261                                 {
 262                                         box.MinEdge.rotateYZBy(90);
 263                                         box.MaxEdge.rotateYZBy(90);
 264                                 }
 265                                 else if(facedir == 2)
 266                                 {
 267                                         box.MinEdge.rotateYZBy(180);
 268                                         box.MaxEdge.rotateYZBy(180);
 269                                 }
 270                                 else if(facedir == 3)
 271                                 {
 272                                         box.MinEdge.rotateYZBy(-90);
 273                                         box.MaxEdge.rotateYZBy(-90);
 274                                 }
 275                                 break;
 276                         case 4:  //x-
 277                                 box.MinEdge.rotateXYBy(90);
 278                                 box.MaxEdge.rotateXYBy(90);
 279                                 if(facedir == 1)
 280                                 {
 281                                         box.MinEdge.rotateYZBy(-90);
 282                                         box.MaxEdge.rotateYZBy(-90);
 283                                 }
 284                                 else if(facedir == 2)
 285                                 {
 286                                         box.MinEdge.rotateYZBy(180);
 287                                         box.MaxEdge.rotateYZBy(180);
 288                                 }
 289                                 else if(facedir == 3)
 290                                 {
 291                                         box.MinEdge.rotateYZBy(90);
 292                                         box.MaxEdge.rotateYZBy(90);
 293                                 }
 294                                 break;
 295                         case 5:
 296                                 box.MinEdge.rotateXYBy(-180);
 297                                 box.MaxEdge.rotateXYBy(-180);
 298                                 if(facedir == 1)
 299                                 {
 300                                         box.MinEdge.rotateXZBy(90);
 301                                         box.MaxEdge.rotateXZBy(90);
 302                                 }
 303                                 else if(facedir == 2)
 304                                 {
 305                                         box.MinEdge.rotateXZBy(180);
 306                                         box.MaxEdge.rotateXZBy(180);
 307                                 }
 308                                 else if(facedir == 3)
 309                                 {
 310                                         box.MinEdge.rotateXZBy(-90);
 311                                         box.MaxEdge.rotateXZBy(-90);
 312                                 }
 313                                 break;
 314                         default:
 315                                 break;
 316                         }
 317                         box.repair();
 318                         boxes.push_back(box);
 319                 }
 320         }
 321         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 322         {
 323                 v3s16 dir = n.getWallMountedDir(nodemgr);
 324
 325                 // top
 326                 if(dir == v3s16(0,1,0))
 327                 {
 328                         boxes.push_back(nodebox.wall_top);
 329                 }
 330                 // bottom
 331                 else if(dir == v3s16(0,-1,0))
 332                 {
 333                         boxes.push_back(nodebox.wall_bottom);
 334                 }
 335                 // side
 336                 else
 337                 {
 338                         v3f vertices[2] =
 339                         {
 340                                 nodebox.wall_side.MinEdge,
 341                                 nodebox.wall_side.MaxEdge
 342                         };
 343
 344                         for(s32 i=0; i<2; i++)
 345                         {
 346                                 if(dir == v3s16(-1,0,0))
 347                                         vertices[i].rotateXZBy(0);
 348                                 if(dir == v3s16(1,0,0))
 349                                         vertices[i].rotateXZBy(180);
 350                                 if(dir == v3s16(0,0,-1))
 351                                         vertices[i].rotateXZBy(90);
 352                                 if(dir == v3s16(0,0,1))
 353                                         vertices[i].rotateXZBy(-90);
 354                         }
 355
 356                         aabb3f box = aabb3f(vertices[0]);
 357                         box.addInternalPoint(vertices[1]);
 358                         boxes.push_back(box);
 359                 }
 360         }
 361         else // NODEBOX_REGULAR
 362         {
 363                 boxes.push_back(aabb3f(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2));
 364         }
 365         return boxes;
 366 }
 367
 368 std::vector<aabb3f> MapNode::getNodeBoxes(INodeDefManager *nodemgr) const
 369 {
 370         const ContentFeatures &f = nodemgr->get(*this);
 371         return transformNodeBox(*this, f.node_box, nodemgr);
 372 }
 373
 374 std::vector<aabb3f> MapNode::getCollisionBoxes(INodeDefManager *nodemgr) const
 375 {
 376         const ContentFeatures &f = nodemgr->get(*this);
 377         if (f.collision_box.fixed.empty())
 378                 return transformNodeBox(*this, f.node_box, nodemgr);
 379         else
 380                 return transformNodeBox(*this, f.collision_box, nodemgr);
 381 }
 382
 383 std::vector<aabb3f> MapNode::getSelectionBoxes(INodeDefManager *nodemgr) const
 384 {
 385         const ContentFeatures &f = nodemgr->get(*this);
 386         return transformNodeBox(*this, f.selection_box, nodemgr);
 387 }
 388
 389 u8 MapNode::getMaxLevel(INodeDefManager *nodemgr) const
 390 {
 391         const ContentFeatures &f = nodemgr->get(*this);
 392         // todo: after update in all games leave only if (f.param_type_2 ==
 393         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 394                 return LIQUID_LEVEL_MAX;
 395         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 396                 return LEVELED_MAX;
 397         return 0;
 398 }
 399
 400 u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 401 {
 402         const ContentFeatures &f = nodemgr->get(*this);
 403         // todo: after update in all games leave only if (f.param_type_2 ==
 404         if(f.liquid_type == LIQUID_SOURCE)
 405                 return LIQUID_LEVEL_SOURCE;
 406         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 407                 return getParam2() & LIQUID_LEVEL_MASK;
 408         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 409                 return getParam2() & LIQUID_LEVEL_MASK;
 410         if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 411                  u8 level = getParam2() & LEVELED_MASK;
 412                  if(level)
 413                         return level;
 414                  if(f.leveled > LEVELED_MAX)
 415                         return LEVELED_MAX;
 416                  return f.leveled; //default
 417         }
 418         return 0;
 419 }
 420
 421 u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 422 {
 423         u8 rest = 0;
 424         if (level < 1) {
 425                 setContent(CONTENT_AIR);
 426                 return 0;
 427         }
 428         const ContentFeatures &f = nodemgr->get(*this);
 429         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 430                 || f.liquid_type == LIQUID_FLOWING
 431                 || f.liquid_type == LIQUID_SOURCE) {
 432                 if (level >= LIQUID_LEVEL_SOURCE) {
 433                         rest = level - LIQUID_LEVEL_SOURCE;
 434                         setContent(nodemgr->getId(f.liquid_alternative_source));
 435                 } else {
 436                         setContent(nodemgr->getId(f.liquid_alternative_flowing));
 437                         setParam2(level & LIQUID_LEVEL_MASK);
 438                 }
 439         } else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
 440                 if (level > LEVELED_MAX) {
 441                         rest = level - LEVELED_MAX;
 442                         level = LEVELED_MAX;
 443                 }
 444                 setParam2(level & LEVELED_MASK);
 445         }
 446         return rest;
 447 }
 448
 449 u8 MapNode::addLevel(INodeDefManager *nodemgr, s8 add)
 450 {
 451         s8 level = getLevel(nodemgr);
 452         if (add == 0) level = 1;
 453         level += add;
 454         return setLevel(nodemgr, level);
 455 }
 456
 457 u32 MapNode::serializedLength(u8 version)
 458 {
 459         if(!ser_ver_supported(version))
 460                 throw VersionMismatchException("ERROR: MapNode format not supported");
 461
 462         if(version == 0)
 463                 return 1;
 464         else if(version <= 9)
 465                 return 2;
 466         else if(version <= 23)
 467                 return 3;
 468         else
 469                 return 4;
 470 }
 471 void MapNode::serialize(u8 *dest, u8 version)
 472 {
 473         if(!ser_ver_supported(version))
 474                 throw VersionMismatchException("ERROR: MapNode format not supported");
 475
 476         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 477         // in memory; conversion just won't work in this direction.
 478         if(version < 24)
 479                 throw SerializationError("MapNode::serialize: serialization to "
 480                                 "version < 24 not possible");
 481
 482         writeU16(dest+0, param0);
 483         writeU8(dest+2, param1);
 484         writeU8(dest+3, param2);
 485 }
 486 void MapNode::deSerialize(u8 *source, u8 version)
 487 {
 488         if(!ser_ver_supported(version))
 489                 throw VersionMismatchException("ERROR: MapNode format not supported");
 490
 491         if(version <= 21)
 492         {
 493                 deSerialize_pre22(source, version);
 494                 return;
 495         }
 496
 497         if(version >= 24){
 498                 param0 = readU16(source+0);
 499                 param1 = readU8(source+2);
 500                 param2 = readU8(source+3);
 501         }else{
 502                 param0 = readU8(source+0);
 503                 param1 = readU8(source+1);
 504                 param2 = readU8(source+2);
 505                 if(param0 > 0x7F){
 506                         param0 |= ((param2&0xF0)<<4);
 507                         param2 &= 0x0F;
 508                 }
 509         }
 510 }
 511 void MapNode::serializeBulk(std::ostream &os, int version,
 512                 const MapNode *nodes, u32 nodecount,
 513                 u8 content_width, u8 params_width, bool compressed)
 514 {
 515         if(!ser_ver_supported(version))
 516                 throw VersionMismatchException("ERROR: MapNode format not supported");
 517
 518         sanity_check(content_width == 2);
 519         sanity_check(params_width == 2);
 520
 521         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 522         // in memory; conversion just won't work in this direction.
 523         if(version < 24)
 524                 throw SerializationError("MapNode::serializeBulk: serialization to "
 525                                 "version < 24 not possible");
 526
 527         SharedBuffer<u8> databuf(nodecount * (content_width + params_width));
 528
 529         // Serialize content
 530         for(u32 i=0; i<nodecount; i++)
 531                 writeU16(&databuf[i*2], nodes[i].param0);
 532
 533         // Serialize param1
 534         u32 start1 = content_width * nodecount;
 535         for(u32 i=0; i<nodecount; i++)
 536                 writeU8(&databuf[start1 + i], nodes[i].param1);
 537
 538         // Serialize param2
 539         u32 start2 = (content_width + 1) * nodecount;
 540         for(u32 i=0; i<nodecount; i++)
 541                 writeU8(&databuf[start2 + i], nodes[i].param2);
 542
 543         /*
 544                 Compress data to output stream
 545         */
 546
 547         if(compressed)
 548         {
 549                 compressZlib(databuf, os);
 550         }
 551         else
 552         {
 553                 os.write((const char*) &databuf[0], databuf.getSize());
 554         }
 555 }
 556
 557 // Deserialize bulk node data
 558 void MapNode::deSerializeBulk(std::istream &is, int version,
 559                 MapNode *nodes, u32 nodecount,
 560                 u8 content_width, u8 params_width, bool compressed)
 561 {
 562         if(!ser_ver_supported(version))
 563                 throw VersionMismatchException("ERROR: MapNode format not supported");
 564
 565         if (version < 22
 566                         || (content_width != 1 && content_width != 2)
 567                         || params_width != 2)
 568                 FATAL_ERROR("Deserialize bulk node data error");
 569
 570         // Uncompress or read data
 571         u32 len = nodecount * (content_width + params_width);
 572         SharedBuffer<u8> databuf(len);
 573         if(compressed)
 574         {
 575                 std::ostringstream os(std::ios_base::binary);
 576                 decompressZlib(is, os);
 577                 std::string s = os.str();
 578                 if(s.size() != len)
 579                         throw SerializationError("deSerializeBulkNodes: "
 580                                         "decompress resulted in invalid size");
 581                 memcpy(&databuf[0], s.c_str(), len);
 582         }
 583         else
 584         {
 585                 is.read((char*) &databuf[0], len);
 586                 if(is.eof() || is.fail())
 587                         throw SerializationError("deSerializeBulkNodes: "
 588                                         "failed to read bulk node data");
 589         }
 590
 591         // Deserialize content
 592         if(content_width == 1)
 593         {
 594                 for(u32 i=0; i<nodecount; i++)
 595                         nodes[i].param0 = readU8(&databuf[i]);
 596         }
 597         else if(content_width == 2)
 598         {
 599                 for(u32 i=0; i<nodecount; i++)
 600                         nodes[i].param0 = readU16(&databuf[i*2]);
 601         }
 602
 603         // Deserialize param1
 604         u32 start1 = content_width * nodecount;
 605         for(u32 i=0; i<nodecount; i++)
 606                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 607
 608         // Deserialize param2
 609         u32 start2 = (content_width + 1) * nodecount;
 610         if(content_width == 1)
 611         {
 612                 for(u32 i=0; i<nodecount; i++) {
 613                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 614                         if(nodes[i].param0 > 0x7F){
 615                                 nodes[i].param0 <<= 4;
 616                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 617                                 nodes[i].param2 &= 0x0F;
 618                         }
 619                 }
 620         }
 621         else if(content_width == 2)
 622         {
 623                 for(u32 i=0; i<nodecount; i++)
 624                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 625         }
 626 }
 627
 628 /*
 629         Legacy serialization
 630 */
 631 void MapNode::deSerialize_pre22(u8 *source, u8 version)
 632 {
 633         if(version <= 1)
 634         {
 635                 param0 = source[0];
 636         }
 637         else if(version <= 9)
 638         {
 639                 param0 = source[0];
 640                 param1 = source[1];
 641         }
 642         else
 643         {
 644                 param0 = source[0];
 645                 param1 = source[1];
 646                 param2 = source[2];
 647                 if(param0 > 0x7f){
 648                         param0 <<= 4;
 649                         param0 |= (param2&0xf0)>>4;
 650                         param2 &= 0x0f;
 651                 }
 652         }
 653
 654         // Convert special values from old version to new
 655         if(version <= 19)
 656         {
 657                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 658                 // are 255 and 254
 659                 // Version 19 is fucked up with sometimes the old values and sometimes not
 660                 if(param0 == 255)
 661                         param0 = CONTENT_IGNORE;
 662                 else if(param0 == 254)
 663                         param0 = CONTENT_AIR;
 664         }
 665
 666         // Translate to our known version
 667         *this = mapnode_translate_to_internal(*this, version);
 668 }