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                 if (param2 >= 4)
 167                         return;
 168
 169                 u8 newrot = param2 & 3;
 170                 param2 &= ~3;
 171                 param2 |= (newrot + rot) & 3;
 172         } else if (cpt2 == CPT2_WALLMOUNTED) {
 173                 u8 wmountface = (param2 & 7);
 174                 if (wmountface <= 1)
 175                         return;
 176
 177                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 178                 param2 &= ~7;
 179                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 180         }
 181 }
 182
 183 static std::vector<aabb3f> transformNodeBox(const MapNode &n,
 184                 const NodeBox &nodebox, INodeDefManager *nodemgr)
 185 {
 186         std::vector<aabb3f> boxes;
 187         if(nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED)
 188         {
 189                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 190                 int facedir = n.getFaceDir(nodemgr);
 191                 u8 axisdir = facedir>>2;
 192                 facedir&=0x03;
 193                 for(std::vector<aabb3f>::const_iterator
 194                                 i = fixed.begin();
 195                                 i != fixed.end(); i++)
 196                 {
 197                         aabb3f box = *i;
 198
 199                         if (nodebox.type == NODEBOX_LEVELED) {
 200                                 box.MaxEdge.Y = -BS/2 + BS*((float)1/LEVELED_MAX) * n.getLevel(nodemgr);
 201                         }
 202
 203                         switch (axisdir)
 204                         {
 205                         case 0:
 206                                 if(facedir == 1)
 207                                 {
 208                                         box.MinEdge.rotateXZBy(-90);
 209                                         box.MaxEdge.rotateXZBy(-90);
 210                                 }
 211                                 else if(facedir == 2)
 212                                 {
 213                                         box.MinEdge.rotateXZBy(180);
 214                                         box.MaxEdge.rotateXZBy(180);
 215                                 }
 216                                 else if(facedir == 3)
 217                                 {
 218                                         box.MinEdge.rotateXZBy(90);
 219                                         box.MaxEdge.rotateXZBy(90);
 220                                 }
 221                                 break;
 222                         case 1: // z+
 223                                 box.MinEdge.rotateYZBy(90);
 224                                 box.MaxEdge.rotateYZBy(90);
 225                                 if(facedir == 1)
 226                                 {
 227                                         box.MinEdge.rotateXYBy(90);
 228                                         box.MaxEdge.rotateXYBy(90);
 229                                 }
 230                                 else if(facedir == 2)
 231                                 {
 232                                         box.MinEdge.rotateXYBy(180);
 233                                         box.MaxEdge.rotateXYBy(180);
 234                                 }
 235                                 else if(facedir == 3)
 236                                 {
 237                                         box.MinEdge.rotateXYBy(-90);
 238                                         box.MaxEdge.rotateXYBy(-90);
 239                                 }
 240                                 break;
 241                         case 2: //z-
 242                                 box.MinEdge.rotateYZBy(-90);
 243                                 box.MaxEdge.rotateYZBy(-90);
 244                                 if(facedir == 1)
 245                                 {
 246                                         box.MinEdge.rotateXYBy(-90);
 247                                         box.MaxEdge.rotateXYBy(-90);
 248                                 }
 249                                 else if(facedir == 2)
 250                                 {
 251                                         box.MinEdge.rotateXYBy(180);
 252                                         box.MaxEdge.rotateXYBy(180);
 253                                 }
 254                                 else if(facedir == 3)
 255                                 {
 256                                         box.MinEdge.rotateXYBy(90);
 257                                         box.MaxEdge.rotateXYBy(90);
 258                                 }
 259                                 break;
 260                         case 3:  //x+
 261                                 box.MinEdge.rotateXYBy(-90);
 262                                 box.MaxEdge.rotateXYBy(-90);
 263                                 if(facedir == 1)
 264                                 {
 265                                         box.MinEdge.rotateYZBy(90);
 266                                         box.MaxEdge.rotateYZBy(90);
 267                                 }
 268                                 else if(facedir == 2)
 269                                 {
 270                                         box.MinEdge.rotateYZBy(180);
 271                                         box.MaxEdge.rotateYZBy(180);
 272                                 }
 273                                 else if(facedir == 3)
 274                                 {
 275                                         box.MinEdge.rotateYZBy(-90);
 276                                         box.MaxEdge.rotateYZBy(-90);
 277                                 }
 278                                 break;
 279                         case 4:  //x-
 280                                 box.MinEdge.rotateXYBy(90);
 281                                 box.MaxEdge.rotateXYBy(90);
 282                                 if(facedir == 1)
 283                                 {
 284                                         box.MinEdge.rotateYZBy(-90);
 285                                         box.MaxEdge.rotateYZBy(-90);
 286                                 }
 287                                 else if(facedir == 2)
 288                                 {
 289                                         box.MinEdge.rotateYZBy(180);
 290                                         box.MaxEdge.rotateYZBy(180);
 291                                 }
 292                                 else if(facedir == 3)
 293                                 {
 294                                         box.MinEdge.rotateYZBy(90);
 295                                         box.MaxEdge.rotateYZBy(90);
 296                                 }
 297                                 break;
 298                         case 5:
 299                                 box.MinEdge.rotateXYBy(-180);
 300                                 box.MaxEdge.rotateXYBy(-180);
 301                                 if(facedir == 1)
 302                                 {
 303                                         box.MinEdge.rotateXZBy(90);
 304                                         box.MaxEdge.rotateXZBy(90);
 305                                 }
 306                                 else if(facedir == 2)
 307                                 {
 308                                         box.MinEdge.rotateXZBy(180);
 309                                         box.MaxEdge.rotateXZBy(180);
 310                                 }
 311                                 else if(facedir == 3)
 312                                 {
 313                                         box.MinEdge.rotateXZBy(-90);
 314                                         box.MaxEdge.rotateXZBy(-90);
 315                                 }
 316                                 break;
 317                         default:
 318                                 break;
 319                         }
 320                         box.repair();
 321                         boxes.push_back(box);
 322                 }
 323         }
 324         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 325         {
 326                 v3s16 dir = n.getWallMountedDir(nodemgr);
 327
 328                 // top
 329                 if(dir == v3s16(0,1,0))
 330                 {
 331                         boxes.push_back(nodebox.wall_top);
 332                 }
 333                 // bottom
 334                 else if(dir == v3s16(0,-1,0))
 335                 {
 336                         boxes.push_back(nodebox.wall_bottom);
 337                 }
 338                 // side
 339                 else
 340                 {
 341                         v3f vertices[2] =
 342                         {
 343                                 nodebox.wall_side.MinEdge,
 344                                 nodebox.wall_side.MaxEdge
 345                         };
 346
 347                         for(s32 i=0; i<2; i++)
 348                         {
 349                                 if(dir == v3s16(-1,0,0))
 350                                         vertices[i].rotateXZBy(0);
 351                                 if(dir == v3s16(1,0,0))
 352                                         vertices[i].rotateXZBy(180);
 353                                 if(dir == v3s16(0,0,-1))
 354                                         vertices[i].rotateXZBy(90);
 355                                 if(dir == v3s16(0,0,1))
 356                                         vertices[i].rotateXZBy(-90);
 357                         }
 358
 359                         aabb3f box = aabb3f(vertices[0]);
 360                         box.addInternalPoint(vertices[1]);
 361                         boxes.push_back(box);
 362                 }
 363         }
 364         else // NODEBOX_REGULAR
 365         {
 366                 boxes.push_back(aabb3f(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2));
 367         }
 368         return boxes;
 369 }
 370
 371 std::vector<aabb3f> MapNode::getNodeBoxes(INodeDefManager *nodemgr) const
 372 {
 373         const ContentFeatures &f = nodemgr->get(*this);
 374         return transformNodeBox(*this, f.node_box, nodemgr);
 375 }
 376
 377 std::vector<aabb3f> MapNode::getCollisionBoxes(INodeDefManager *nodemgr) const
 378 {
 379         const ContentFeatures &f = nodemgr->get(*this);
 380         if (f.collision_box.fixed.empty())
 381                 return transformNodeBox(*this, f.node_box, nodemgr);
 382         else
 383                 return transformNodeBox(*this, f.collision_box, nodemgr);
 384 }
 385
 386 std::vector<aabb3f> MapNode::getSelectionBoxes(INodeDefManager *nodemgr) const
 387 {
 388         const ContentFeatures &f = nodemgr->get(*this);
 389         return transformNodeBox(*this, f.selection_box, nodemgr);
 390 }
 391
 392 u8 MapNode::getMaxLevel(INodeDefManager *nodemgr) const
 393 {
 394         const ContentFeatures &f = nodemgr->get(*this);
 395         // todo: after update in all games leave only if (f.param_type_2 ==
 396         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 397                 return LIQUID_LEVEL_MAX;
 398         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 399                 return LEVELED_MAX;
 400         return 0;
 401 }
 402
 403 u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 404 {
 405         const ContentFeatures &f = nodemgr->get(*this);
 406         // todo: after update in all games leave only if (f.param_type_2 ==
 407         if(f.liquid_type == LIQUID_SOURCE)
 408                 return LIQUID_LEVEL_SOURCE;
 409         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 410                 return getParam2() & LIQUID_LEVEL_MASK;
 411         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 412                 return getParam2() & LIQUID_LEVEL_MASK;
 413         if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 414                  u8 level = getParam2() & LEVELED_MASK;
 415                  if(level)
 416                         return level;
 417                  if(f.leveled > LEVELED_MAX)
 418                         return LEVELED_MAX;
 419                  return f.leveled; //default
 420         }
 421         return 0;
 422 }
 423
 424 u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 425 {
 426         u8 rest = 0;
 427         if (level < 1) {
 428                 setContent(CONTENT_AIR);
 429                 return 0;
 430         }
 431         const ContentFeatures &f = nodemgr->get(*this);
 432         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 433                 || f.liquid_type == LIQUID_FLOWING
 434                 || f.liquid_type == LIQUID_SOURCE) {
 435                 if (level >= LIQUID_LEVEL_SOURCE) {
 436                         rest = level - LIQUID_LEVEL_SOURCE;
 437                         setContent(nodemgr->getId(f.liquid_alternative_source));
 438                 } else {
 439                         setContent(nodemgr->getId(f.liquid_alternative_flowing));
 440                         setParam2(level & LIQUID_LEVEL_MASK);
 441                 }
 442         } else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
 443                 if (level > LEVELED_MAX) {
 444                         rest = level - LEVELED_MAX;
 445                         level = LEVELED_MAX;
 446                 }
 447                 setParam2(level & LEVELED_MASK);
 448         }
 449         return rest;
 450 }
 451
 452 u8 MapNode::addLevel(INodeDefManager *nodemgr, s8 add)
 453 {
 454         s8 level = getLevel(nodemgr);
 455         if (add == 0) level = 1;
 456         level += add;
 457         return setLevel(nodemgr, level);
 458 }
 459
 460 u32 MapNode::serializedLength(u8 version)
 461 {
 462         if(!ser_ver_supported(version))
 463                 throw VersionMismatchException("ERROR: MapNode format not supported");
 464
 465         if(version == 0)
 466                 return 1;
 467         else if(version <= 9)
 468                 return 2;
 469         else if(version <= 23)
 470                 return 3;
 471         else
 472                 return 4;
 473 }
 474 void MapNode::serialize(u8 *dest, u8 version)
 475 {
 476         if(!ser_ver_supported(version))
 477                 throw VersionMismatchException("ERROR: MapNode format not supported");
 478
 479         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 480         // in memory; conversion just won't work in this direction.
 481         if(version < 24)
 482                 throw SerializationError("MapNode::serialize: serialization to "
 483                                 "version < 24 not possible");
 484
 485         writeU16(dest+0, param0);
 486         writeU8(dest+2, param1);
 487         writeU8(dest+3, param2);
 488 }
 489 void MapNode::deSerialize(u8 *source, u8 version)
 490 {
 491         if(!ser_ver_supported(version))
 492                 throw VersionMismatchException("ERROR: MapNode format not supported");
 493
 494         if(version <= 21)
 495         {
 496                 deSerialize_pre22(source, version);
 497                 return;
 498         }
 499
 500         if(version >= 24){
 501                 param0 = readU16(source+0);
 502                 param1 = readU8(source+2);
 503                 param2 = readU8(source+3);
 504         }else{
 505                 param0 = readU8(source+0);
 506                 param1 = readU8(source+1);
 507                 param2 = readU8(source+2);
 508                 if(param0 > 0x7F){
 509                         param0 |= ((param2&0xF0)<<4);
 510                         param2 &= 0x0F;
 511                 }
 512         }
 513 }
 514 void MapNode::serializeBulk(std::ostream &os, int version,
 515                 const MapNode *nodes, u32 nodecount,
 516                 u8 content_width, u8 params_width, bool compressed)
 517 {
 518         if(!ser_ver_supported(version))
 519                 throw VersionMismatchException("ERROR: MapNode format not supported");
 520
 521         sanity_check(content_width == 2);
 522         sanity_check(params_width == 2);
 523
 524         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 525         // in memory; conversion just won't work in this direction.
 526         if(version < 24)
 527                 throw SerializationError("MapNode::serializeBulk: serialization to "
 528                                 "version < 24 not possible");
 529
 530         SharedBuffer<u8> databuf(nodecount * (content_width + params_width));
 531
 532         // Serialize content
 533         for(u32 i=0; i<nodecount; i++)
 534                 writeU16(&databuf[i*2], nodes[i].param0);
 535
 536         // Serialize param1
 537         u32 start1 = content_width * nodecount;
 538         for(u32 i=0; i<nodecount; i++)
 539                 writeU8(&databuf[start1 + i], nodes[i].param1);
 540
 541         // Serialize param2
 542         u32 start2 = (content_width + 1) * nodecount;
 543         for(u32 i=0; i<nodecount; i++)
 544                 writeU8(&databuf[start2 + i], nodes[i].param2);
 545
 546         /*
 547                 Compress data to output stream
 548         */
 549
 550         if(compressed)
 551         {
 552                 compressZlib(databuf, os);
 553         }
 554         else
 555         {
 556                 os.write((const char*) &databuf[0], databuf.getSize());
 557         }
 558 }
 559
 560 // Deserialize bulk node data
 561 void MapNode::deSerializeBulk(std::istream &is, int version,
 562                 MapNode *nodes, u32 nodecount,
 563                 u8 content_width, u8 params_width, bool compressed)
 564 {
 565         if(!ser_ver_supported(version))
 566                 throw VersionMismatchException("ERROR: MapNode format not supported");
 567
 568         if (version < 22
 569                         || (content_width != 1 && content_width != 2)
 570                         || params_width != 2)
 571                 FATAL_ERROR("Deserialize bulk node data error");
 572
 573         // Uncompress or read data
 574         u32 len = nodecount * (content_width + params_width);
 575         SharedBuffer<u8> databuf(len);
 576         if(compressed)
 577         {
 578                 std::ostringstream os(std::ios_base::binary);
 579                 decompressZlib(is, os);
 580                 std::string s = os.str();
 581                 if(s.size() != len)
 582                         throw SerializationError("deSerializeBulkNodes: "
 583                                         "decompress resulted in invalid size");
 584                 memcpy(&databuf[0], s.c_str(), len);
 585         }
 586         else
 587         {
 588                 is.read((char*) &databuf[0], len);
 589                 if(is.eof() || is.fail())
 590                         throw SerializationError("deSerializeBulkNodes: "
 591                                         "failed to read bulk node data");
 592         }
 593
 594         // Deserialize content
 595         if(content_width == 1)
 596         {
 597                 for(u32 i=0; i<nodecount; i++)
 598                         nodes[i].param0 = readU8(&databuf[i]);
 599         }
 600         else if(content_width == 2)
 601         {
 602                 for(u32 i=0; i<nodecount; i++)
 603                         nodes[i].param0 = readU16(&databuf[i*2]);
 604         }
 605
 606         // Deserialize param1
 607         u32 start1 = content_width * nodecount;
 608         for(u32 i=0; i<nodecount; i++)
 609                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 610
 611         // Deserialize param2
 612         u32 start2 = (content_width + 1) * nodecount;
 613         if(content_width == 1)
 614         {
 615                 for(u32 i=0; i<nodecount; i++) {
 616                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 617                         if(nodes[i].param0 > 0x7F){
 618                                 nodes[i].param0 <<= 4;
 619                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 620                                 nodes[i].param2 &= 0x0F;
 621                         }
 622                 }
 623         }
 624         else if(content_width == 2)
 625         {
 626                 for(u32 i=0; i<nodecount; i++)
 627                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 628         }
 629 }
 630
 631 /*
 632         Legacy serialization
 633 */
 634 void MapNode::deSerialize_pre22(u8 *source, u8 version)
 635 {
 636         if(version <= 1)
 637         {
 638                 param0 = source[0];
 639         }
 640         else if(version <= 9)
 641         {
 642                 param0 = source[0];
 643                 param1 = source[1];
 644         }
 645         else
 646         {
 647                 param0 = source[0];
 648                 param1 = source[1];
 649                 param2 = source[2];
 650                 if(param0 > 0x7f){
 651                         param0 <<= 4;
 652                         param0 |= (param2&0xf0)>>4;
 653                         param2 &= 0x0f;
 654                 }
 655         }
 656
 657         // Convert special values from old version to new
 658         if(version <= 19)
 659         {
 660                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 661                 // are 255 and 254
 662                 // Version 19 is fucked up with sometimes the old values and sometimes not
 663                 if(param0 == 255)
 664                         param0 = CONTENT_IGNORE;
 665                 else if(param0 == 254)
 666                         param0 = CONTENT_AIR;
 667         }
 668
 669         // Translate to our known version
 670         *this = mapnode_translate_to_internal(*this, version);
 671 }