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