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 <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(0);
  74 }
  75
  76 u8 MapNode::getLight(enum LightBank bank, INodeDefManager *nodemgr) const
  77 {
  78         // Select the brightest of [light source, propagated light]
  79         const ContentFeatures &f = nodemgr->get(*this);
  80         u8 light = 0;
  81         if(f.param_type == CPT_LIGHT)
  82         {
  83                 if(bank == LIGHTBANK_DAY)
  84                         light = param1 & 0x0f;
  85                 else if(bank == LIGHTBANK_NIGHT)
  86                         light = (param1>>4)&0x0f;
  87                 else
  88                         assert(0);
  89         }
  90         if(f.light_source > light)
  91                 light = f.light_source;
  92         return light;
  93 }
  94
  95 bool MapNode::getLightBanks(u8 &lightday, u8 &lightnight, INodeDefManager *nodemgr) const
  96 {
  97         // Select the brightest of [light source, propagated light]
  98         const ContentFeatures &f = nodemgr->get(*this);
  99         if(f.param_type == CPT_LIGHT)
 100         {
 101                 lightday = param1 & 0x0f;
 102                 lightnight = (param1>>4)&0x0f;
 103         }
 104         else
 105         {
 106                 lightday = 0;
 107                 lightnight = 0;
 108         }
 109         if(f.light_source > lightday)
 110                 lightday = f.light_source;
 111         if(f.light_source > lightnight)
 112                 lightnight = f.light_source;
 113         return f.param_type == CPT_LIGHT || f.light_source != 0;
 114 }
 115
 116 u8 MapNode::getFaceDir(INodeDefManager *nodemgr) const
 117 {
 118         const ContentFeatures &f = nodemgr->get(*this);
 119         if(f.param_type_2 == CPT2_FACEDIR)
 120                 return getParam2() & 0x1F;
 121         return 0;
 122 }
 123
 124 u8 MapNode::getWallMounted(INodeDefManager *nodemgr) const
 125 {
 126         const ContentFeatures &f = nodemgr->get(*this);
 127         if(f.param_type_2 == CPT2_WALLMOUNTED)
 128                 return getParam2() & 0x07;
 129         return 0;
 130 }
 131
 132 v3s16 MapNode::getWallMountedDir(INodeDefManager *nodemgr) const
 133 {
 134         switch(getWallMounted(nodemgr))
 135         {
 136         case 0: default: return v3s16(0,1,0);
 137         case 1: return v3s16(0,-1,0);
 138         case 2: return v3s16(1,0,0);
 139         case 3: return v3s16(-1,0,0);
 140         case 4: return v3s16(0,0,1);
 141         case 5: return v3s16(0,0,-1);
 142         }
 143 }
 144
 145 void MapNode::rotateAlongYAxis(INodeDefManager *nodemgr, Rotation rot) {
 146         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 147
 148         if (cpt2 == CPT2_FACEDIR) {
 149                 u8 newrot = param2 & 3;
 150                 param2 &= ~3;
 151                 param2 |= (newrot + rot) & 3;
 152         } else if (cpt2 == CPT2_WALLMOUNTED) {
 153                 u8 wmountface = (param2 & 7);
 154                 if (wmountface <= 1)
 155                         return;
 156
 157                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 158                 param2 &= ~7;
 159                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 160         }
 161 }
 162
 163 static std::vector<aabb3f> transformNodeBox(const MapNode &n,
 164                 const NodeBox &nodebox, INodeDefManager *nodemgr)
 165 {
 166         std::vector<aabb3f> boxes;
 167         if(nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED)
 168         {
 169                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 170                 int facedir = n.getFaceDir(nodemgr);
 171                 u8 axisdir = facedir>>2;
 172                 facedir&=0x03;
 173                 for(std::vector<aabb3f>::const_iterator
 174                                 i = fixed.begin();
 175                                 i != fixed.end(); i++)
 176                 {
 177                         aabb3f box = *i;
 178
 179                         if (nodebox.type == NODEBOX_LEVELED) {
 180                                 box.MaxEdge.Y = -BS/2 + BS*((float)1/LEVELED_MAX) * n.getLevel(nodemgr);
 181                         }
 182
 183                         switch (axisdir)
 184                         {
 185                         case 0:
 186                                 if(facedir == 1)
 187                                 {
 188                                         box.MinEdge.rotateXZBy(-90);
 189                                         box.MaxEdge.rotateXZBy(-90);
 190                                 }
 191                                 else if(facedir == 2)
 192                                 {
 193                                         box.MinEdge.rotateXZBy(180);
 194                                         box.MaxEdge.rotateXZBy(180);
 195                                 }
 196                                 else if(facedir == 3)
 197                                 {
 198                                         box.MinEdge.rotateXZBy(90);
 199                                         box.MaxEdge.rotateXZBy(90);
 200                                 }
 201                                 break;
 202                         case 1: // z+
 203                                 box.MinEdge.rotateYZBy(90);
 204                                 box.MaxEdge.rotateYZBy(90);
 205                                 if(facedir == 1)
 206                                 {
 207                                         box.MinEdge.rotateXYBy(90);
 208                                         box.MaxEdge.rotateXYBy(90);
 209                                 }
 210                                 else if(facedir == 2)
 211                                 {
 212                                         box.MinEdge.rotateXYBy(180);
 213                                         box.MaxEdge.rotateXYBy(180);
 214                                 }
 215                                 else if(facedir == 3)
 216                                 {
 217                                         box.MinEdge.rotateXYBy(-90);
 218                                         box.MaxEdge.rotateXYBy(-90);
 219                                 }
 220                                 break;
 221                         case 2: //z-
 222                                 box.MinEdge.rotateYZBy(-90);
 223                                 box.MaxEdge.rotateYZBy(-90);
 224                                 if(facedir == 1)
 225                                 {
 226                                         box.MinEdge.rotateXYBy(-90);
 227                                         box.MaxEdge.rotateXYBy(-90);
 228                                 }
 229                                 else if(facedir == 2)
 230                                 {
 231                                         box.MinEdge.rotateXYBy(180);
 232                                         box.MaxEdge.rotateXYBy(180);
 233                                 }
 234                                 else if(facedir == 3)
 235                                 {
 236                                         box.MinEdge.rotateXYBy(90);
 237                                         box.MaxEdge.rotateXYBy(90);
 238                                 }
 239                                 break;
 240                         case 3:  //x+
 241                                 box.MinEdge.rotateXYBy(-90);
 242                                 box.MaxEdge.rotateXYBy(-90);
 243                                 if(facedir == 1)
 244                                 {
 245                                         box.MinEdge.rotateYZBy(90);
 246                                         box.MaxEdge.rotateYZBy(90);
 247                                 }
 248                                 else if(facedir == 2)
 249                                 {
 250                                         box.MinEdge.rotateYZBy(180);
 251                                         box.MaxEdge.rotateYZBy(180);
 252                                 }
 253                                 else if(facedir == 3)
 254                                 {
 255                                         box.MinEdge.rotateYZBy(-90);
 256                                         box.MaxEdge.rotateYZBy(-90);
 257                                 }
 258                                 break;
 259                         case 4:  //x-
 260                                 box.MinEdge.rotateXYBy(90);
 261                                 box.MaxEdge.rotateXYBy(90);
 262                                 if(facedir == 1)
 263                                 {
 264                                         box.MinEdge.rotateYZBy(-90);
 265                                         box.MaxEdge.rotateYZBy(-90);
 266                                 }
 267                                 else if(facedir == 2)
 268                                 {
 269                                         box.MinEdge.rotateYZBy(180);
 270                                         box.MaxEdge.rotateYZBy(180);
 271                                 }
 272                                 else if(facedir == 3)
 273                                 {
 274                                         box.MinEdge.rotateYZBy(90);
 275                                         box.MaxEdge.rotateYZBy(90);
 276                                 }
 277                                 break;
 278                         case 5:
 279                                 box.MinEdge.rotateXYBy(-180);
 280                                 box.MaxEdge.rotateXYBy(-180);
 281                                 if(facedir == 1)
 282                                 {
 283                                         box.MinEdge.rotateXZBy(90);
 284                                         box.MaxEdge.rotateXZBy(90);
 285                                 }
 286                                 else if(facedir == 2)
 287                                 {
 288                                         box.MinEdge.rotateXZBy(180);
 289                                         box.MaxEdge.rotateXZBy(180);
 290                                 }
 291                                 else if(facedir == 3)
 292                                 {
 293                                         box.MinEdge.rotateXZBy(-90);
 294                                         box.MaxEdge.rotateXZBy(-90);
 295                                 }
 296                                 break;
 297                         default:
 298                                 break;
 299                         }
 300                         box.repair();
 301                         boxes.push_back(box);
 302                 }
 303         }
 304         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 305         {
 306                 v3s16 dir = n.getWallMountedDir(nodemgr);
 307
 308                 // top
 309                 if(dir == v3s16(0,1,0))
 310                 {
 311                         boxes.push_back(nodebox.wall_top);
 312                 }
 313                 // bottom
 314                 else if(dir == v3s16(0,-1,0))
 315                 {
 316                         boxes.push_back(nodebox.wall_bottom);
 317                 }
 318                 // side
 319                 else
 320                 {
 321                         v3f vertices[2] =
 322                         {
 323                                 nodebox.wall_side.MinEdge,
 324                                 nodebox.wall_side.MaxEdge
 325                         };
 326
 327                         for(s32 i=0; i<2; i++)
 328                         {
 329                                 if(dir == v3s16(-1,0,0))
 330                                         vertices[i].rotateXZBy(0);
 331                                 if(dir == v3s16(1,0,0))
 332                                         vertices[i].rotateXZBy(180);
 333                                 if(dir == v3s16(0,0,-1))
 334                                         vertices[i].rotateXZBy(90);
 335                                 if(dir == v3s16(0,0,1))
 336                                         vertices[i].rotateXZBy(-90);
 337                         }
 338
 339                         aabb3f box = aabb3f(vertices[0]);
 340                         box.addInternalPoint(vertices[1]);
 341                         boxes.push_back(box);
 342                 }
 343         }
 344         else // NODEBOX_REGULAR
 345         {
 346                 boxes.push_back(aabb3f(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2));
 347         }
 348         return boxes;
 349 }
 350
 351 std::vector<aabb3f> MapNode::getNodeBoxes(INodeDefManager *nodemgr) const
 352 {
 353         const ContentFeatures &f = nodemgr->get(*this);
 354         return transformNodeBox(*this, f.node_box, nodemgr);
 355 }
 356
 357 std::vector<aabb3f> MapNode::getCollisionBoxes(INodeDefManager *nodemgr) const
 358 {
 359         const ContentFeatures &f = nodemgr->get(*this);
 360         if (f.collision_box.fixed.empty())
 361                 return transformNodeBox(*this, f.node_box, nodemgr);
 362         else
 363                 return transformNodeBox(*this, f.collision_box, nodemgr);
 364 }
 365
 366 std::vector<aabb3f> MapNode::getSelectionBoxes(INodeDefManager *nodemgr) const
 367 {
 368         const ContentFeatures &f = nodemgr->get(*this);
 369         return transformNodeBox(*this, f.selection_box, nodemgr);
 370 }
 371
 372 u8 MapNode::getMaxLevel(INodeDefManager *nodemgr) const
 373 {
 374         const ContentFeatures &f = nodemgr->get(*this);
 375         // todo: after update in all games leave only if (f.param_type_2 ==
 376         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 377                 return LIQUID_LEVEL_MAX;
 378         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 379                 return LEVELED_MAX;
 380         return 0;
 381 }
 382
 383 u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 384 {
 385         const ContentFeatures &f = nodemgr->get(*this);
 386         // todo: after update in all games leave only if (f.param_type_2 ==
 387         if(f.liquid_type == LIQUID_SOURCE)
 388                 return LIQUID_LEVEL_SOURCE;
 389         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 390                 return getParam2() & LIQUID_LEVEL_MASK;
 391         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 392                 return getParam2() & LIQUID_LEVEL_MASK;
 393         if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 394                  u8 level = getParam2() & LEVELED_MASK;
 395                  if(level)
 396                         return level;
 397                  if(f.leveled > LEVELED_MAX)
 398                         return LEVELED_MAX;
 399                  return f.leveled; //default
 400         }
 401         return 0;
 402 }
 403
 404 u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 405 {
 406         u8 rest = 0;
 407         if (level < 1) {
 408                 setContent(CONTENT_AIR);
 409                 return 0;
 410         }
 411         const ContentFeatures &f = nodemgr->get(*this);
 412         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 413                 || f.liquid_type == LIQUID_FLOWING
 414                 || f.liquid_type == LIQUID_SOURCE) {
 415                 if (level >= LIQUID_LEVEL_SOURCE) {
 416                         rest = level - LIQUID_LEVEL_SOURCE;
 417                         setContent(nodemgr->getId(f.liquid_alternative_source));
 418                 } else {
 419                         setContent(nodemgr->getId(f.liquid_alternative_flowing));
 420                         setParam2(level & LIQUID_LEVEL_MASK);
 421                 }
 422         } else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
 423                 if (level > LEVELED_MAX) {
 424                         rest = level - LEVELED_MAX;
 425                         level = LEVELED_MAX;
 426                 }
 427                 setParam2(level & LEVELED_MASK);
 428         }
 429         return rest;
 430 }
 431
 432 u8 MapNode::addLevel(INodeDefManager *nodemgr, s8 add)
 433 {
 434         s8 level = getLevel(nodemgr);
 435         if (add == 0) level = 1;
 436         level += add;
 437         return setLevel(nodemgr, level);
 438 }
 439
 440 void MapNode::freezeMelt(INodeDefManager *ndef) {
 441         u8 level_was_max = this->getMaxLevel(ndef);
 442         u8 level_was = this->getLevel(ndef);
 443         this->setContent(ndef->getId(ndef->get(*this).freezemelt));
 444         u8 level_now_max = this->getMaxLevel(ndef);
 445         if (level_was_max && level_was_max != level_now_max) {
 446                 u8 want = (float)level_now_max / level_was_max * level_was;
 447                 if (!want)
 448                         want = 1;
 449                 if (want != level_was)
 450                         this->setLevel(ndef, want);
 451                 //errorstream<<"was="<<(int)level_was<<"/"<<(int)level_was_max<<" nowm="<<(int)want<<"/"<<(int)level_now_max<< " => "<<(int)this->getLevel(ndef)<< std::endl;
 452         }
 453         if (this->getMaxLevel(ndef) && !this->getLevel(ndef))
 454                 this->addLevel(ndef);
 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         assert(content_width == 2);
 519         assert(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         assert(version >= 22);
 566         assert(content_width == 1 || content_width == 2);
 567         assert(params_width == 2);
 568
 569         // Uncompress or read data
 570         u32 len = nodecount * (content_width + params_width);
 571         SharedBuffer<u8> databuf(len);
 572         if(compressed)
 573         {
 574                 std::ostringstream os(std::ios_base::binary);
 575                 decompressZlib(is, os);
 576                 std::string s = os.str();
 577                 if(s.size() != len)
 578                         throw SerializationError("deSerializeBulkNodes: "
 579                                         "decompress resulted in invalid size");
 580                 memcpy(&databuf[0], s.c_str(), len);
 581         }
 582         else
 583         {
 584                 is.read((char*) &databuf[0], len);
 585                 if(is.eof() || is.fail())
 586                         throw SerializationError("deSerializeBulkNodes: "
 587                                         "failed to read bulk node data");
 588         }
 589
 590         // Deserialize content
 591         if(content_width == 1)
 592         {
 593                 for(u32 i=0; i<nodecount; i++)
 594                         nodes[i].param0 = readU8(&databuf[i]);
 595         }
 596         else if(content_width == 2)
 597         {
 598                 for(u32 i=0; i<nodecount; i++)
 599                         nodes[i].param0 = readU16(&databuf[i*2]);
 600         }
 601
 602         // Deserialize param1
 603         u32 start1 = content_width * nodecount;
 604         for(u32 i=0; i<nodecount; i++)
 605                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 606
 607         // Deserialize param2
 608         u32 start2 = (content_width + 1) * nodecount;
 609         if(content_width == 1)
 610         {
 611                 for(u32 i=0; i<nodecount; i++) {
 612                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 613                         if(nodes[i].param0 > 0x7F){
 614                                 nodes[i].param0 <<= 4;
 615                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 616                                 nodes[i].param2 &= 0x0F;
 617                         }
 618                 }
 619         }
 620         else if(content_width == 2)
 621         {
 622                 for(u32 i=0; i<nodecount; i++)
 623                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 624         }
 625 }
 626
 627 /*
 628         Legacy serialization
 629 */
 630 void MapNode::deSerialize_pre22(u8 *source, u8 version)
 631 {
 632         if(version <= 1)
 633         {
 634                 param0 = source[0];
 635         }
 636         else if(version <= 9)
 637         {
 638                 param0 = source[0];
 639                 param1 = source[1];
 640         }
 641         else
 642         {
 643                 param0 = source[0];
 644                 param1 = source[1];
 645                 param2 = source[2];
 646                 if(param0 > 0x7f){
 647                         param0 <<= 4;
 648                         param0 |= (param2&0xf0)>>4;
 649                         param2 &= 0x0f;
 650                 }
 651         }
 652
 653         // Convert special values from old version to new
 654         if(version <= 19)
 655         {
 656                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 657                 // are 255 and 254
 658                 // Version 19 is fucked up with sometimes the old values and sometimes not
 659                 if(param0 == 255)
 660                         param0 = CONTENT_IGNORE;
 661                 else if(param0 == 254)
 662                         param0 = CONTENT_AIR;
 663         }
 664
 665         // Translate to our known version
 666         *this = mapnode_translate_to_internal(*this, version);
 667 }