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