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 u8 MapNode::getLightNoChecks(enum LightBank bank, const ContentFeatures *f)
  92 {
  93         return MYMAX(f->light_source,
  94                      bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f);
  95 }
  96
  97 bool MapNode::getLightBanks(u8 &lightday, u8 &lightnight, INodeDefManager *nodemgr) const
  98 {
  99         // Select the brightest of [light source, propagated light]
 100         const ContentFeatures &f = nodemgr->get(*this);
 101         if(f.param_type == CPT_LIGHT)
 102         {
 103                 lightday = param1 & 0x0f;
 104                 lightnight = (param1>>4)&0x0f;
 105         }
 106         else
 107         {
 108                 lightday = 0;
 109                 lightnight = 0;
 110         }
 111         if(f.light_source > lightday)
 112                 lightday = f.light_source;
 113         if(f.light_source > lightnight)
 114                 lightnight = f.light_source;
 115         return f.param_type == CPT_LIGHT || f.light_source != 0;
 116 }
 117
 118 u8 MapNode::getFaceDir(INodeDefManager *nodemgr) const
 119 {
 120         const ContentFeatures &f = nodemgr->get(*this);
 121         if(f.param_type_2 == CPT2_FACEDIR)
 122                 return getParam2() & 0x1F;
 123         return 0;
 124 }
 125
 126 u8 MapNode::getWallMounted(INodeDefManager *nodemgr) const
 127 {
 128         const ContentFeatures &f = nodemgr->get(*this);
 129         if(f.param_type_2 == CPT2_WALLMOUNTED)
 130                 return getParam2() & 0x07;
 131         return 0;
 132 }
 133
 134 v3s16 MapNode::getWallMountedDir(INodeDefManager *nodemgr) const
 135 {
 136         switch(getWallMounted(nodemgr))
 137         {
 138         case 0: default: return v3s16(0,1,0);
 139         case 1: return v3s16(0,-1,0);
 140         case 2: return v3s16(1,0,0);
 141         case 3: return v3s16(-1,0,0);
 142         case 4: return v3s16(0,0,1);
 143         case 5: return v3s16(0,0,-1);
 144         }
 145 }
 146
 147 void MapNode::rotateAlongYAxis(INodeDefManager *nodemgr, Rotation rot) {
 148         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 149
 150         if (cpt2 == CPT2_FACEDIR) {
 151                 u8 newrot = param2 & 3;
 152                 param2 &= ~3;
 153                 param2 |= (newrot + rot) & 3;
 154         } else if (cpt2 == CPT2_WALLMOUNTED) {
 155                 u8 wmountface = (param2 & 7);
 156                 if (wmountface <= 1)
 157                         return;
 158
 159                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 160                 param2 &= ~7;
 161                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 162         }
 163 }
 164
 165 static std::vector<aabb3f> transformNodeBox(const MapNode &n,
 166                 const NodeBox &nodebox, INodeDefManager *nodemgr)
 167 {
 168         std::vector<aabb3f> boxes;
 169         if(nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED)
 170         {
 171                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 172                 int facedir = n.getFaceDir(nodemgr);
 173                 u8 axisdir = facedir>>2;
 174                 facedir&=0x03;
 175                 for(std::vector<aabb3f>::const_iterator
 176                                 i = fixed.begin();
 177                                 i != fixed.end(); i++)
 178                 {
 179                         aabb3f box = *i;
 180
 181                         if (nodebox.type == NODEBOX_LEVELED) {
 182                                 box.MaxEdge.Y = -BS/2 + BS*((float)1/LEVELED_MAX) * n.getLevel(nodemgr);
 183                         }
 184
 185                         switch (axisdir)
 186                         {
 187                         case 0:
 188                                 if(facedir == 1)
 189                                 {
 190                                         box.MinEdge.rotateXZBy(-90);
 191                                         box.MaxEdge.rotateXZBy(-90);
 192                                 }
 193                                 else if(facedir == 2)
 194                                 {
 195                                         box.MinEdge.rotateXZBy(180);
 196                                         box.MaxEdge.rotateXZBy(180);
 197                                 }
 198                                 else if(facedir == 3)
 199                                 {
 200                                         box.MinEdge.rotateXZBy(90);
 201                                         box.MaxEdge.rotateXZBy(90);
 202                                 }
 203                                 break;
 204                         case 1: // z+
 205                                 box.MinEdge.rotateYZBy(90);
 206                                 box.MaxEdge.rotateYZBy(90);
 207                                 if(facedir == 1)
 208                                 {
 209                                         box.MinEdge.rotateXYBy(90);
 210                                         box.MaxEdge.rotateXYBy(90);
 211                                 }
 212                                 else if(facedir == 2)
 213                                 {
 214                                         box.MinEdge.rotateXYBy(180);
 215                                         box.MaxEdge.rotateXYBy(180);
 216                                 }
 217                                 else if(facedir == 3)
 218                                 {
 219                                         box.MinEdge.rotateXYBy(-90);
 220                                         box.MaxEdge.rotateXYBy(-90);
 221                                 }
 222                                 break;
 223                         case 2: //z-
 224                                 box.MinEdge.rotateYZBy(-90);
 225                                 box.MaxEdge.rotateYZBy(-90);
 226                                 if(facedir == 1)
 227                                 {
 228                                         box.MinEdge.rotateXYBy(-90);
 229                                         box.MaxEdge.rotateXYBy(-90);
 230                                 }
 231                                 else if(facedir == 2)
 232                                 {
 233                                         box.MinEdge.rotateXYBy(180);
 234                                         box.MaxEdge.rotateXYBy(180);
 235                                 }
 236                                 else if(facedir == 3)
 237                                 {
 238                                         box.MinEdge.rotateXYBy(90);
 239                                         box.MaxEdge.rotateXYBy(90);
 240                                 }
 241                                 break;
 242                         case 3:  //x+
 243                                 box.MinEdge.rotateXYBy(-90);
 244                                 box.MaxEdge.rotateXYBy(-90);
 245                                 if(facedir == 1)
 246                                 {
 247                                         box.MinEdge.rotateYZBy(90);
 248                                         box.MaxEdge.rotateYZBy(90);
 249                                 }
 250                                 else if(facedir == 2)
 251                                 {
 252                                         box.MinEdge.rotateYZBy(180);
 253                                         box.MaxEdge.rotateYZBy(180);
 254                                 }
 255                                 else if(facedir == 3)
 256                                 {
 257                                         box.MinEdge.rotateYZBy(-90);
 258                                         box.MaxEdge.rotateYZBy(-90);
 259                                 }
 260                                 break;
 261                         case 4:  //x-
 262                                 box.MinEdge.rotateXYBy(90);
 263                                 box.MaxEdge.rotateXYBy(90);
 264                                 if(facedir == 1)
 265                                 {
 266                                         box.MinEdge.rotateYZBy(-90);
 267                                         box.MaxEdge.rotateYZBy(-90);
 268                                 }
 269                                 else if(facedir == 2)
 270                                 {
 271                                         box.MinEdge.rotateYZBy(180);
 272                                         box.MaxEdge.rotateYZBy(180);
 273                                 }
 274                                 else if(facedir == 3)
 275                                 {
 276                                         box.MinEdge.rotateYZBy(90);
 277                                         box.MaxEdge.rotateYZBy(90);
 278                                 }
 279                                 break;
 280                         case 5:
 281                                 box.MinEdge.rotateXYBy(-180);
 282                                 box.MaxEdge.rotateXYBy(-180);
 283                                 if(facedir == 1)
 284                                 {
 285                                         box.MinEdge.rotateXZBy(90);
 286                                         box.MaxEdge.rotateXZBy(90);
 287                                 }
 288                                 else if(facedir == 2)
 289                                 {
 290                                         box.MinEdge.rotateXZBy(180);
 291                                         box.MaxEdge.rotateXZBy(180);
 292                                 }
 293                                 else if(facedir == 3)
 294                                 {
 295                                         box.MinEdge.rotateXZBy(-90);
 296                                         box.MaxEdge.rotateXZBy(-90);
 297                                 }
 298                                 break;
 299                         default:
 300                                 break;
 301                         }
 302                         box.repair();
 303                         boxes.push_back(box);
 304                 }
 305         }
 306         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 307         {
 308                 v3s16 dir = n.getWallMountedDir(nodemgr);
 309
 310                 // top
 311                 if(dir == v3s16(0,1,0))
 312                 {
 313                         boxes.push_back(nodebox.wall_top);
 314                 }
 315                 // bottom
 316                 else if(dir == v3s16(0,-1,0))
 317                 {
 318                         boxes.push_back(nodebox.wall_bottom);
 319                 }
 320                 // side
 321                 else
 322                 {
 323                         v3f vertices[2] =
 324                         {
 325                                 nodebox.wall_side.MinEdge,
 326                                 nodebox.wall_side.MaxEdge
 327                         };
 328
 329                         for(s32 i=0; i<2; i++)
 330                         {
 331                                 if(dir == v3s16(-1,0,0))
 332                                         vertices[i].rotateXZBy(0);
 333                                 if(dir == v3s16(1,0,0))
 334                                         vertices[i].rotateXZBy(180);
 335                                 if(dir == v3s16(0,0,-1))
 336                                         vertices[i].rotateXZBy(90);
 337                                 if(dir == v3s16(0,0,1))
 338                                         vertices[i].rotateXZBy(-90);
 339                         }
 340
 341                         aabb3f box = aabb3f(vertices[0]);
 342                         box.addInternalPoint(vertices[1]);
 343                         boxes.push_back(box);
 344                 }
 345         }
 346         else // NODEBOX_REGULAR
 347         {
 348                 boxes.push_back(aabb3f(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2));
 349         }
 350         return boxes;
 351 }
 352
 353 std::vector<aabb3f> MapNode::getNodeBoxes(INodeDefManager *nodemgr) const
 354 {
 355         const ContentFeatures &f = nodemgr->get(*this);
 356         return transformNodeBox(*this, f.node_box, nodemgr);
 357 }
 358
 359 std::vector<aabb3f> MapNode::getCollisionBoxes(INodeDefManager *nodemgr) const
 360 {
 361         const ContentFeatures &f = nodemgr->get(*this);
 362         if (f.collision_box.fixed.empty())
 363                 return transformNodeBox(*this, f.node_box, nodemgr);
 364         else
 365                 return transformNodeBox(*this, f.collision_box, nodemgr);
 366 }
 367
 368 std::vector<aabb3f> MapNode::getSelectionBoxes(INodeDefManager *nodemgr) const
 369 {
 370         const ContentFeatures &f = nodemgr->get(*this);
 371         return transformNodeBox(*this, f.selection_box, nodemgr);
 372 }
 373
 374 u8 MapNode::getMaxLevel(INodeDefManager *nodemgr) const
 375 {
 376         const ContentFeatures &f = nodemgr->get(*this);
 377         // todo: after update in all games leave only if (f.param_type_2 ==
 378         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 379                 return LIQUID_LEVEL_MAX;
 380         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 381                 return LEVELED_MAX;
 382         return 0;
 383 }
 384
 385 u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 386 {
 387         const ContentFeatures &f = nodemgr->get(*this);
 388         // todo: after update in all games leave only if (f.param_type_2 ==
 389         if(f.liquid_type == LIQUID_SOURCE)
 390                 return LIQUID_LEVEL_SOURCE;
 391         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 392                 return getParam2() & LIQUID_LEVEL_MASK;
 393         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 394                 return getParam2() & LIQUID_LEVEL_MASK;
 395         if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 396                  u8 level = getParam2() & LEVELED_MASK;
 397                  if(level)
 398                         return level;
 399                  if(f.leveled > LEVELED_MAX)
 400                         return LEVELED_MAX;
 401                  return f.leveled; //default
 402         }
 403         return 0;
 404 }
 405
 406 u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 407 {
 408         u8 rest = 0;
 409         if (level < 1) {
 410                 setContent(CONTENT_AIR);
 411                 return 0;
 412         }
 413         const ContentFeatures &f = nodemgr->get(*this);
 414         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 415                 || f.liquid_type == LIQUID_FLOWING
 416                 || f.liquid_type == LIQUID_SOURCE) {
 417                 if (level >= LIQUID_LEVEL_SOURCE) {
 418                         rest = level - LIQUID_LEVEL_SOURCE;
 419                         setContent(nodemgr->getId(f.liquid_alternative_source));
 420                 } else {
 421                         setContent(nodemgr->getId(f.liquid_alternative_flowing));
 422                         setParam2(level & LIQUID_LEVEL_MASK);
 423                 }
 424         } else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
 425                 if (level > LEVELED_MAX) {
 426                         rest = level - LEVELED_MAX;
 427                         level = LEVELED_MAX;
 428                 }
 429                 setParam2(level & LEVELED_MASK);
 430         }
 431         return rest;
 432 }
 433
 434 u8 MapNode::addLevel(INodeDefManager *nodemgr, s8 add)
 435 {
 436         s8 level = getLevel(nodemgr);
 437         if (add == 0) level = 1;
 438         level += add;
 439         return setLevel(nodemgr, level);
 440 }
 441
 442 void MapNode::freezeMelt(INodeDefManager *ndef) {
 443         u8 level_was_max = this->getMaxLevel(ndef);
 444         u8 level_was = this->getLevel(ndef);
 445         this->setContent(ndef->getId(ndef->get(*this).freezemelt));
 446         u8 level_now_max = this->getMaxLevel(ndef);
 447         if (level_was_max && level_was_max != level_now_max) {
 448                 u8 want = (float)level_now_max / level_was_max * level_was;
 449                 if (!want)
 450                         want = 1;
 451                 if (want != level_was)
 452                         this->setLevel(ndef, want);
 453                 //errorstream<<"was="<<(int)level_was<<"/"<<(int)level_was_max<<" nowm="<<(int)want<<"/"<<(int)level_now_max<< " => "<<(int)this->getLevel(ndef)<< std::endl;
 454         }
 455         if (this->getMaxLevel(ndef) && !this->getLevel(ndef))
 456                 this->addLevel(ndef);
 457 }
 458
 459 u32 MapNode::serializedLength(u8 version)
 460 {
 461         if(!ser_ver_supported(version))
 462                 throw VersionMismatchException("ERROR: MapNode format not supported");
 463
 464         if(version == 0)
 465                 return 1;
 466         else if(version <= 9)
 467                 return 2;
 468         else if(version <= 23)
 469                 return 3;
 470         else
 471                 return 4;
 472 }
 473 void MapNode::serialize(u8 *dest, u8 version)
 474 {
 475         if(!ser_ver_supported(version))
 476                 throw VersionMismatchException("ERROR: MapNode format not supported");
 477
 478         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 479         // in memory; conversion just won't work in this direction.
 480         if(version < 24)
 481                 throw SerializationError("MapNode::serialize: serialization to "
 482                                 "version < 24 not possible");
 483
 484         writeU16(dest+0, param0);
 485         writeU8(dest+2, param1);
 486         writeU8(dest+3, param2);
 487 }
 488 void MapNode::deSerialize(u8 *source, u8 version)
 489 {
 490         if(!ser_ver_supported(version))
 491                 throw VersionMismatchException("ERROR: MapNode format not supported");
 492
 493         if(version <= 21)
 494         {
 495                 deSerialize_pre22(source, version);
 496                 return;
 497         }
 498
 499         if(version >= 24){
 500                 param0 = readU16(source+0);
 501                 param1 = readU8(source+2);
 502                 param2 = readU8(source+3);
 503         }else{
 504                 param0 = readU8(source+0);
 505                 param1 = readU8(source+1);
 506                 param2 = readU8(source+2);
 507                 if(param0 > 0x7F){
 508                         param0 |= ((param2&0xF0)<<4);
 509                         param2 &= 0x0F;
 510                 }
 511         }
 512 }
 513 void MapNode::serializeBulk(std::ostream &os, int version,
 514                 const MapNode *nodes, u32 nodecount,
 515                 u8 content_width, u8 params_width, bool compressed)
 516 {
 517         if(!ser_ver_supported(version))
 518                 throw VersionMismatchException("ERROR: MapNode format not supported");
 519
 520         assert(content_width == 2);
 521         assert(params_width == 2);
 522
 523         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 524         // in memory; conversion just won't work in this direction.
 525         if(version < 24)
 526                 throw SerializationError("MapNode::serializeBulk: serialization to "
 527                                 "version < 24 not possible");
 528
 529         SharedBuffer<u8> databuf(nodecount * (content_width + params_width));
 530
 531         // Serialize content
 532         for(u32 i=0; i<nodecount; i++)
 533                 writeU16(&databuf[i*2], nodes[i].param0);
 534
 535         // Serialize param1
 536         u32 start1 = content_width * nodecount;
 537         for(u32 i=0; i<nodecount; i++)
 538                 writeU8(&databuf[start1 + i], nodes[i].param1);
 539
 540         // Serialize param2
 541         u32 start2 = (content_width + 1) * nodecount;
 542         for(u32 i=0; i<nodecount; i++)
 543                 writeU8(&databuf[start2 + i], nodes[i].param2);
 544
 545         /*
 546                 Compress data to output stream
 547         */
 548
 549         if(compressed)
 550         {
 551                 compressZlib(databuf, os);
 552         }
 553         else
 554         {
 555                 os.write((const char*) &databuf[0], databuf.getSize());
 556         }
 557 }
 558
 559 // Deserialize bulk node data
 560 void MapNode::deSerializeBulk(std::istream &is, int version,
 561                 MapNode *nodes, u32 nodecount,
 562                 u8 content_width, u8 params_width, bool compressed)
 563 {
 564         if(!ser_ver_supported(version))
 565                 throw VersionMismatchException("ERROR: MapNode format not supported");
 566
 567         assert(version >= 22);
 568         assert(content_width == 1 || content_width == 2);
 569         assert(params_width == 2);
 570
 571         // Uncompress or read data
 572         u32 len = nodecount * (content_width + params_width);
 573         SharedBuffer<u8> databuf(len);
 574         if(compressed)
 575         {
 576                 std::ostringstream os(std::ios_base::binary);
 577                 decompressZlib(is, os);
 578                 std::string s = os.str();
 579                 if(s.size() != len)
 580                         throw SerializationError("deSerializeBulkNodes: "
 581                                         "decompress resulted in invalid size");
 582                 memcpy(&databuf[0], s.c_str(), len);
 583         }
 584         else
 585         {
 586                 is.read((char*) &databuf[0], len);
 587                 if(is.eof() || is.fail())
 588                         throw SerializationError("deSerializeBulkNodes: "
 589                                         "failed to read bulk node data");
 590         }
 591
 592         // Deserialize content
 593         if(content_width == 1)
 594         {
 595                 for(u32 i=0; i<nodecount; i++)
 596                         nodes[i].param0 = readU8(&databuf[i]);
 597         }
 598         else if(content_width == 2)
 599         {
 600                 for(u32 i=0; i<nodecount; i++)
 601                         nodes[i].param0 = readU16(&databuf[i*2]);
 602         }
 603
 604         // Deserialize param1
 605         u32 start1 = content_width * nodecount;
 606         for(u32 i=0; i<nodecount; i++)
 607                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 608
 609         // Deserialize param2
 610         u32 start2 = (content_width + 1) * nodecount;
 611         if(content_width == 1)
 612         {
 613                 for(u32 i=0; i<nodecount; i++) {
 614                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 615                         if(nodes[i].param0 > 0x7F){
 616                                 nodes[i].param0 <<= 4;
 617                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 618                                 nodes[i].param2 &= 0x0F;
 619                         }
 620                 }
 621         }
 622         else if(content_width == 2)
 623         {
 624                 for(u32 i=0; i<nodecount; i++)
 625                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 626         }
 627 }
 628
 629 /*
 630         Legacy serialization
 631 */
 632 void MapNode::deSerialize_pre22(u8 *source, u8 version)
 633 {
 634         if(version <= 1)
 635         {
 636                 param0 = source[0];
 637         }
 638         else if(version <= 9)
 639         {
 640                 param0 = source[0];
 641                 param1 = source[1];
 642         }
 643         else
 644         {
 645                 param0 = source[0];
 646                 param1 = source[1];
 647                 param2 = source[2];
 648                 if(param0 > 0x7f){
 649                         param0 <<= 4;
 650                         param0 |= (param2&0xf0)>>4;
 651                         param2 &= 0x0f;
 652                 }
 653         }
 654
 655         // Convert special values from old version to new
 656         if(version <= 19)
 657         {
 658                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 659                 // are 255 and 254
 660                 // Version 19 is fucked up with sometimes the old values and sometimes not
 661                 if(param0 == 255)
 662                         param0 = CONTENT_IGNORE;
 663                 else if(param0 == 254)
 664                         param0 = CONTENT_AIR;
 665         }
 666
 667         // Translate to our known version
 668         *this = mapnode_translate_to_internal(*this, version);
 669 }