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 {
 164         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 165
 166         if (cpt2 == CPT2_FACEDIR) {
 167                 static const u8 rotate_facedir[24 * 4] = {
 168                         // Table value = rotated facedir
 169                         // Columns: 0, 90, 180, 270 degrees rotation around vertical axis
 170                         // Rotation is anticlockwise as seen from above (+Y)
 171
 172                         0, 1, 2, 3,  // Initial facedir 0 to 3
 173                         1, 2, 3, 0,
 174                         2, 3, 0, 1,
 175                         3, 0, 1, 2,
 176
 177                         4, 13, 10, 19,  // 4 to 7
 178                         5, 14, 11, 16,
 179                         6, 15, 8, 17,
 180                         7, 12, 9, 18,
 181
 182                         8, 17, 6, 15,  // 8 to 11
 183                         9, 18, 7, 12,
 184                         10, 19, 4, 13,
 185                         11, 16, 5, 14,
 186
 187                         12, 9, 18, 7,  // 12 to 15
 188                         13, 10, 19, 4,
 189                         14, 11, 16, 5,
 190                         15, 8, 17, 6,
 191
 192                         16, 5, 14, 11,  // 16 to 19
 193                         17, 6, 15, 8,
 194                         18, 7, 12, 9,
 195                         19, 4, 13, 10,
 196
 197                         20, 23, 22, 21,  // 20 to 23
 198                         21, 20, 23, 22,
 199                         22, 21, 20, 23,
 200                         23, 22, 21, 20
 201                 };
 202                 u8 facedir = (param2 & 31) % 24;
 203                 u8 index = facedir * 4 + rot;
 204                 param2 &= ~31;
 205                 param2 |= rotate_facedir[index];
 206         } else if (cpt2 == CPT2_WALLMOUNTED) {
 207                 u8 wmountface = (param2 & 7);
 208                 if (wmountface <= 1)
 209                         return;
 210
 211                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 212                 param2 &= ~7;
 213                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 214         }
 215 }
 216
 217 static std::vector<aabb3f> transformNodeBox(const MapNode &n,
 218                 const NodeBox &nodebox, INodeDefManager *nodemgr)
 219 {
 220         std::vector<aabb3f> boxes;
 221         if(nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED)
 222         {
 223                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 224                 int facedir = n.getFaceDir(nodemgr);
 225                 u8 axisdir = facedir>>2;
 226                 facedir&=0x03;
 227                 for(std::vector<aabb3f>::const_iterator
 228                                 i = fixed.begin();
 229                                 i != fixed.end(); ++i)
 230                 {
 231                         aabb3f box = *i;
 232
 233                         if (nodebox.type == NODEBOX_LEVELED) {
 234                                 box.MaxEdge.Y = -BS/2 + BS*((float)1/LEVELED_MAX) * n.getLevel(nodemgr);
 235                         }
 236
 237                         switch (axisdir)
 238                         {
 239                         case 0:
 240                                 if(facedir == 1)
 241                                 {
 242                                         box.MinEdge.rotateXZBy(-90);
 243                                         box.MaxEdge.rotateXZBy(-90);
 244                                 }
 245                                 else if(facedir == 2)
 246                                 {
 247                                         box.MinEdge.rotateXZBy(180);
 248                                         box.MaxEdge.rotateXZBy(180);
 249                                 }
 250                                 else if(facedir == 3)
 251                                 {
 252                                         box.MinEdge.rotateXZBy(90);
 253                                         box.MaxEdge.rotateXZBy(90);
 254                                 }
 255                                 break;
 256                         case 1: // z+
 257                                 box.MinEdge.rotateYZBy(90);
 258                                 box.MaxEdge.rotateYZBy(90);
 259                                 if(facedir == 1)
 260                                 {
 261                                         box.MinEdge.rotateXYBy(90);
 262                                         box.MaxEdge.rotateXYBy(90);
 263                                 }
 264                                 else if(facedir == 2)
 265                                 {
 266                                         box.MinEdge.rotateXYBy(180);
 267                                         box.MaxEdge.rotateXYBy(180);
 268                                 }
 269                                 else if(facedir == 3)
 270                                 {
 271                                         box.MinEdge.rotateXYBy(-90);
 272                                         box.MaxEdge.rotateXYBy(-90);
 273                                 }
 274                                 break;
 275                         case 2: //z-
 276                                 box.MinEdge.rotateYZBy(-90);
 277                                 box.MaxEdge.rotateYZBy(-90);
 278                                 if(facedir == 1)
 279                                 {
 280                                         box.MinEdge.rotateXYBy(-90);
 281                                         box.MaxEdge.rotateXYBy(-90);
 282                                 }
 283                                 else if(facedir == 2)
 284                                 {
 285                                         box.MinEdge.rotateXYBy(180);
 286                                         box.MaxEdge.rotateXYBy(180);
 287                                 }
 288                                 else if(facedir == 3)
 289                                 {
 290                                         box.MinEdge.rotateXYBy(90);
 291                                         box.MaxEdge.rotateXYBy(90);
 292                                 }
 293                                 break;
 294                         case 3:  //x+
 295                                 box.MinEdge.rotateXYBy(-90);
 296                                 box.MaxEdge.rotateXYBy(-90);
 297                                 if(facedir == 1)
 298                                 {
 299                                         box.MinEdge.rotateYZBy(90);
 300                                         box.MaxEdge.rotateYZBy(90);
 301                                 }
 302                                 else if(facedir == 2)
 303                                 {
 304                                         box.MinEdge.rotateYZBy(180);
 305                                         box.MaxEdge.rotateYZBy(180);
 306                                 }
 307                                 else if(facedir == 3)
 308                                 {
 309                                         box.MinEdge.rotateYZBy(-90);
 310                                         box.MaxEdge.rotateYZBy(-90);
 311                                 }
 312                                 break;
 313                         case 4:  //x-
 314                                 box.MinEdge.rotateXYBy(90);
 315                                 box.MaxEdge.rotateXYBy(90);
 316                                 if(facedir == 1)
 317                                 {
 318                                         box.MinEdge.rotateYZBy(-90);
 319                                         box.MaxEdge.rotateYZBy(-90);
 320                                 }
 321                                 else if(facedir == 2)
 322                                 {
 323                                         box.MinEdge.rotateYZBy(180);
 324                                         box.MaxEdge.rotateYZBy(180);
 325                                 }
 326                                 else if(facedir == 3)
 327                                 {
 328                                         box.MinEdge.rotateYZBy(90);
 329                                         box.MaxEdge.rotateYZBy(90);
 330                                 }
 331                                 break;
 332                         case 5:
 333                                 box.MinEdge.rotateXYBy(-180);
 334                                 box.MaxEdge.rotateXYBy(-180);
 335                                 if(facedir == 1)
 336                                 {
 337                                         box.MinEdge.rotateXZBy(90);
 338                                         box.MaxEdge.rotateXZBy(90);
 339                                 }
 340                                 else if(facedir == 2)
 341                                 {
 342                                         box.MinEdge.rotateXZBy(180);
 343                                         box.MaxEdge.rotateXZBy(180);
 344                                 }
 345                                 else if(facedir == 3)
 346                                 {
 347                                         box.MinEdge.rotateXZBy(-90);
 348                                         box.MaxEdge.rotateXZBy(-90);
 349                                 }
 350                                 break;
 351                         default:
 352                                 break;
 353                         }
 354                         box.repair();
 355                         boxes.push_back(box);
 356                 }
 357         }
 358         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 359         {
 360                 v3s16 dir = n.getWallMountedDir(nodemgr);
 361
 362                 // top
 363                 if(dir == v3s16(0,1,0))
 364                 {
 365                         boxes.push_back(nodebox.wall_top);
 366                 }
 367                 // bottom
 368                 else if(dir == v3s16(0,-1,0))
 369                 {
 370                         boxes.push_back(nodebox.wall_bottom);
 371                 }
 372                 // side
 373                 else
 374                 {
 375                         v3f vertices[2] =
 376                         {
 377                                 nodebox.wall_side.MinEdge,
 378                                 nodebox.wall_side.MaxEdge
 379                         };
 380
 381                         for(s32 i=0; i<2; i++)
 382                         {
 383                                 if(dir == v3s16(-1,0,0))
 384                                         vertices[i].rotateXZBy(0);
 385                                 if(dir == v3s16(1,0,0))
 386                                         vertices[i].rotateXZBy(180);
 387                                 if(dir == v3s16(0,0,-1))
 388                                         vertices[i].rotateXZBy(90);
 389                                 if(dir == v3s16(0,0,1))
 390                                         vertices[i].rotateXZBy(-90);
 391                         }
 392
 393                         aabb3f box = aabb3f(vertices[0]);
 394                         box.addInternalPoint(vertices[1]);
 395                         boxes.push_back(box);
 396                 }
 397         }
 398         else // NODEBOX_REGULAR
 399         {
 400                 boxes.push_back(aabb3f(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2));
 401         }
 402         return boxes;
 403 }
 404
 405 std::vector<aabb3f> MapNode::getNodeBoxes(INodeDefManager *nodemgr) const
 406 {
 407         const ContentFeatures &f = nodemgr->get(*this);
 408         return transformNodeBox(*this, f.node_box, nodemgr);
 409 }
 410
 411 std::vector<aabb3f> MapNode::getCollisionBoxes(INodeDefManager *nodemgr) const
 412 {
 413         const ContentFeatures &f = nodemgr->get(*this);
 414         if (f.collision_box.fixed.empty())
 415                 return transformNodeBox(*this, f.node_box, nodemgr);
 416         else
 417                 return transformNodeBox(*this, f.collision_box, nodemgr);
 418 }
 419
 420 std::vector<aabb3f> MapNode::getSelectionBoxes(INodeDefManager *nodemgr) const
 421 {
 422         const ContentFeatures &f = nodemgr->get(*this);
 423         return transformNodeBox(*this, f.selection_box, nodemgr);
 424 }
 425
 426 u8 MapNode::getMaxLevel(INodeDefManager *nodemgr) const
 427 {
 428         const ContentFeatures &f = nodemgr->get(*this);
 429         // todo: after update in all games leave only if (f.param_type_2 ==
 430         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 431                 return LIQUID_LEVEL_MAX;
 432         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 433                 return LEVELED_MAX;
 434         return 0;
 435 }
 436
 437 u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 438 {
 439         const ContentFeatures &f = nodemgr->get(*this);
 440         // todo: after update in all games leave only if (f.param_type_2 ==
 441         if(f.liquid_type == LIQUID_SOURCE)
 442                 return LIQUID_LEVEL_SOURCE;
 443         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 444                 return getParam2() & LIQUID_LEVEL_MASK;
 445         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 446                 return getParam2() & LIQUID_LEVEL_MASK;
 447         if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 448                  u8 level = getParam2() & LEVELED_MASK;
 449                  if(level)
 450                         return level;
 451                  if(f.leveled > LEVELED_MAX)
 452                         return LEVELED_MAX;
 453                  return f.leveled; //default
 454         }
 455         return 0;
 456 }
 457
 458 u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 459 {
 460         u8 rest = 0;
 461         if (level < 1) {
 462                 setContent(CONTENT_AIR);
 463                 return 0;
 464         }
 465         const ContentFeatures &f = nodemgr->get(*this);
 466         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 467                 || f.liquid_type == LIQUID_FLOWING
 468                 || f.liquid_type == LIQUID_SOURCE) {
 469                 if (level >= LIQUID_LEVEL_SOURCE) {
 470                         rest = level - LIQUID_LEVEL_SOURCE;
 471                         setContent(nodemgr->getId(f.liquid_alternative_source));
 472                 } else {
 473                         setContent(nodemgr->getId(f.liquid_alternative_flowing));
 474                         setParam2(level & LIQUID_LEVEL_MASK);
 475                 }
 476         } else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
 477                 if (level > LEVELED_MAX) {
 478                         rest = level - LEVELED_MAX;
 479                         level = LEVELED_MAX;
 480                 }
 481                 setParam2(level & LEVELED_MASK);
 482         }
 483         return rest;
 484 }
 485
 486 u8 MapNode::addLevel(INodeDefManager *nodemgr, s8 add)
 487 {
 488         s8 level = getLevel(nodemgr);
 489         if (add == 0) level = 1;
 490         level += add;
 491         return setLevel(nodemgr, level);
 492 }
 493
 494 u32 MapNode::serializedLength(u8 version)
 495 {
 496         if(!ser_ver_supported(version))
 497                 throw VersionMismatchException("ERROR: MapNode format not supported");
 498
 499         if(version == 0)
 500                 return 1;
 501         else if(version <= 9)
 502                 return 2;
 503         else if(version <= 23)
 504                 return 3;
 505         else
 506                 return 4;
 507 }
 508 void MapNode::serialize(u8 *dest, u8 version)
 509 {
 510         if(!ser_ver_supported(version))
 511                 throw VersionMismatchException("ERROR: MapNode format not supported");
 512
 513         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 514         // in memory; conversion just won't work in this direction.
 515         if(version < 24)
 516                 throw SerializationError("MapNode::serialize: serialization to "
 517                                 "version < 24 not possible");
 518
 519         writeU16(dest+0, param0);
 520         writeU8(dest+2, param1);
 521         writeU8(dest+3, param2);
 522 }
 523 void MapNode::deSerialize(u8 *source, u8 version)
 524 {
 525         if(!ser_ver_supported(version))
 526                 throw VersionMismatchException("ERROR: MapNode format not supported");
 527
 528         if(version <= 21)
 529         {
 530                 deSerialize_pre22(source, version);
 531                 return;
 532         }
 533
 534         if(version >= 24){
 535                 param0 = readU16(source+0);
 536                 param1 = readU8(source+2);
 537                 param2 = readU8(source+3);
 538         }else{
 539                 param0 = readU8(source+0);
 540                 param1 = readU8(source+1);
 541                 param2 = readU8(source+2);
 542                 if(param0 > 0x7F){
 543                         param0 |= ((param2&0xF0)<<4);
 544                         param2 &= 0x0F;
 545                 }
 546         }
 547 }
 548 void MapNode::serializeBulk(std::ostream &os, int version,
 549                 const MapNode *nodes, u32 nodecount,
 550                 u8 content_width, u8 params_width, bool compressed)
 551 {
 552         if(!ser_ver_supported(version))
 553                 throw VersionMismatchException("ERROR: MapNode format not supported");
 554
 555         sanity_check(content_width == 2);
 556         sanity_check(params_width == 2);
 557
 558         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 559         // in memory; conversion just won't work in this direction.
 560         if(version < 24)
 561                 throw SerializationError("MapNode::serializeBulk: serialization to "
 562                                 "version < 24 not possible");
 563
 564         SharedBuffer<u8> databuf(nodecount * (content_width + params_width));
 565
 566         // Serialize content
 567         for(u32 i=0; i<nodecount; i++)
 568                 writeU16(&databuf[i*2], nodes[i].param0);
 569
 570         // Serialize param1
 571         u32 start1 = content_width * nodecount;
 572         for(u32 i=0; i<nodecount; i++)
 573                 writeU8(&databuf[start1 + i], nodes[i].param1);
 574
 575         // Serialize param2
 576         u32 start2 = (content_width + 1) * nodecount;
 577         for(u32 i=0; i<nodecount; i++)
 578                 writeU8(&databuf[start2 + i], nodes[i].param2);
 579
 580         /*
 581                 Compress data to output stream
 582         */
 583
 584         if(compressed)
 585         {
 586                 compressZlib(databuf, os);
 587         }
 588         else
 589         {
 590                 os.write((const char*) &databuf[0], databuf.getSize());
 591         }
 592 }
 593
 594 // Deserialize bulk node data
 595 void MapNode::deSerializeBulk(std::istream &is, int version,
 596                 MapNode *nodes, u32 nodecount,
 597                 u8 content_width, u8 params_width, bool compressed)
 598 {
 599         if(!ser_ver_supported(version))
 600                 throw VersionMismatchException("ERROR: MapNode format not supported");
 601
 602         if (version < 22
 603                         || (content_width != 1 && content_width != 2)
 604                         || params_width != 2)
 605                 FATAL_ERROR("Deserialize bulk node data error");
 606
 607         // Uncompress or read data
 608         u32 len = nodecount * (content_width + params_width);
 609         SharedBuffer<u8> databuf(len);
 610         if(compressed)
 611         {
 612                 std::ostringstream os(std::ios_base::binary);
 613                 decompressZlib(is, os);
 614                 std::string s = os.str();
 615                 if(s.size() != len)
 616                         throw SerializationError("deSerializeBulkNodes: "
 617                                         "decompress resulted in invalid size");
 618                 memcpy(&databuf[0], s.c_str(), len);
 619         }
 620         else
 621         {
 622                 is.read((char*) &databuf[0], len);
 623                 if(is.eof() || is.fail())
 624                         throw SerializationError("deSerializeBulkNodes: "
 625                                         "failed to read bulk node data");
 626         }
 627
 628         // Deserialize content
 629         if(content_width == 1)
 630         {
 631                 for(u32 i=0; i<nodecount; i++)
 632                         nodes[i].param0 = readU8(&databuf[i]);
 633         }
 634         else if(content_width == 2)
 635         {
 636                 for(u32 i=0; i<nodecount; i++)
 637                         nodes[i].param0 = readU16(&databuf[i*2]);
 638         }
 639
 640         // Deserialize param1
 641         u32 start1 = content_width * nodecount;
 642         for(u32 i=0; i<nodecount; i++)
 643                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 644
 645         // Deserialize param2
 646         u32 start2 = (content_width + 1) * nodecount;
 647         if(content_width == 1)
 648         {
 649                 for(u32 i=0; i<nodecount; i++) {
 650                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 651                         if(nodes[i].param0 > 0x7F){
 652                                 nodes[i].param0 <<= 4;
 653                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 654                                 nodes[i].param2 &= 0x0F;
 655                         }
 656                 }
 657         }
 658         else if(content_width == 2)
 659         {
 660                 for(u32 i=0; i<nodecount; i++)
 661                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 662         }
 663 }
 664
 665 /*
 666         Legacy serialization
 667 */
 668 void MapNode::deSerialize_pre22(u8 *source, u8 version)
 669 {
 670         if(version <= 1)
 671         {
 672                 param0 = source[0];
 673         }
 674         else if(version <= 9)
 675         {
 676                 param0 = source[0];
 677                 param1 = source[1];
 678         }
 679         else
 680         {
 681                 param0 = source[0];
 682                 param1 = source[1];
 683                 param2 = source[2];
 684                 if(param0 > 0x7f){
 685                         param0 <<= 4;
 686                         param0 |= (param2&0xf0)>>4;
 687                         param2 &= 0x0f;
 688                 }
 689         }
 690
 691         // Convert special values from old version to new
 692         if(version <= 19)
 693         {
 694                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 695                 // are 255 and 254
 696                 // Version 19 is fucked up with sometimes the old values and sometimes not
 697                 if(param0 == 255)
 698                         param0 = CONTENT_IGNORE;
 699                 else if(param0 == 254)
 700                         param0 = CONTENT_AIR;
 701         }
 702
 703         // Translate to our known version
 704         *this = mapnode_translate_to_internal(*this, version);
 705 }