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 "map.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::getColor(const ContentFeatures &f, video::SColor *color) const
  59 {
  60         if (f.palette) {
  61                 *color = (*f.palette)[param2];
  62                 return;
  63         }
  64         *color = f.color;
  65 }
  66
  67 void MapNode::setLight(enum LightBank bank, u8 a_light, const ContentFeatures &f)
  68 {
  69         // If node doesn't contain light data, ignore this
  70         if(f.param_type != CPT_LIGHT)
  71                 return;
  72         if(bank == LIGHTBANK_DAY)
  73         {
  74                 param1 &= 0xf0;
  75                 param1 |= a_light & 0x0f;
  76         }
  77         else if(bank == LIGHTBANK_NIGHT)
  78         {
  79                 param1 &= 0x0f;
  80                 param1 |= (a_light & 0x0f)<<4;
  81         }
  82         else
  83                 assert("Invalid light bank" == NULL);
  84 }
  85
  86 void MapNode::setLight(enum LightBank bank, u8 a_light, INodeDefManager *nodemgr)
  87 {
  88         setLight(bank, a_light, nodemgr->get(*this));
  89 }
  90
  91 bool MapNode::isLightDayNightEq(INodeDefManager *nodemgr) const
  92 {
  93         const ContentFeatures &f = nodemgr->get(*this);
  94         bool isEqual;
  95
  96         if (f.param_type == CPT_LIGHT) {
  97                 u8 day   = MYMAX(f.light_source, param1 & 0x0f);
  98                 u8 night = MYMAX(f.light_source, (param1 >> 4) & 0x0f);
  99                 isEqual = day == night;
 100         } else {
 101                 isEqual = true;
 102         }
 103
 104         return isEqual;
 105 }
 106
 107 u8 MapNode::getLight(enum LightBank bank, INodeDefManager *nodemgr) const
 108 {
 109         // Select the brightest of [light source, propagated light]
 110         const ContentFeatures &f = nodemgr->get(*this);
 111
 112         u8 light;
 113         if(f.param_type == CPT_LIGHT)
 114                 light = bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f;
 115         else
 116                 light = 0;
 117
 118         return MYMAX(f.light_source, light);
 119 }
 120
 121 u8 MapNode::getLightRaw(enum LightBank bank, const ContentFeatures &f) const
 122 {
 123         if(f.param_type == CPT_LIGHT)
 124                 return bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f;
 125         return 0;
 126 }
 127
 128 u8 MapNode::getLightNoChecks(enum LightBank bank, const ContentFeatures *f) const
 129 {
 130         return MYMAX(f->light_source,
 131                      bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f);
 132 }
 133
 134 bool MapNode::getLightBanks(u8 &lightday, u8 &lightnight, INodeDefManager *nodemgr) const
 135 {
 136         // Select the brightest of [light source, propagated light]
 137         const ContentFeatures &f = nodemgr->get(*this);
 138         if(f.param_type == CPT_LIGHT)
 139         {
 140                 lightday = param1 & 0x0f;
 141                 lightnight = (param1>>4)&0x0f;
 142         }
 143         else
 144         {
 145                 lightday = 0;
 146                 lightnight = 0;
 147         }
 148         if(f.light_source > lightday)
 149                 lightday = f.light_source;
 150         if(f.light_source > lightnight)
 151                 lightnight = f.light_source;
 152         return f.param_type == CPT_LIGHT || f.light_source != 0;
 153 }
 154
 155 u8 MapNode::getFaceDir(INodeDefManager *nodemgr) const
 156 {
 157         const ContentFeatures &f = nodemgr->get(*this);
 158         if (f.param_type_2 == CPT2_FACEDIR ||
 159                         f.param_type_2 == CPT2_COLORED_FACEDIR)
 160                 return (getParam2() & 0x1F) % 24;
 161         return 0;
 162 }
 163
 164 u8 MapNode::getWallMounted(INodeDefManager *nodemgr) const
 165 {
 166         const ContentFeatures &f = nodemgr->get(*this);
 167         if (f.param_type_2 == CPT2_WALLMOUNTED ||
 168                         f.param_type_2 == CPT2_COLORED_WALLMOUNTED)
 169                 return getParam2() & 0x07;
 170         return 0;
 171 }
 172
 173 v3s16 MapNode::getWallMountedDir(INodeDefManager *nodemgr) const
 174 {
 175         switch(getWallMounted(nodemgr))
 176         {
 177         case 0: default: return v3s16(0,1,0);
 178         case 1: return v3s16(0,-1,0);
 179         case 2: return v3s16(1,0,0);
 180         case 3: return v3s16(-1,0,0);
 181         case 4: return v3s16(0,0,1);
 182         case 5: return v3s16(0,0,-1);
 183         }
 184 }
 185
 186 void MapNode::rotateAlongYAxis(INodeDefManager *nodemgr, Rotation rot)
 187 {
 188         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 189
 190         if (cpt2 == CPT2_FACEDIR || cpt2 == CPT2_COLORED_FACEDIR) {
 191                 static const u8 rotate_facedir[24 * 4] = {
 192                         // Table value = rotated facedir
 193                         // Columns: 0, 90, 180, 270 degrees rotation around vertical axis
 194                         // Rotation is anticlockwise as seen from above (+Y)
 195
 196                         0, 1, 2, 3,  // Initial facedir 0 to 3
 197                         1, 2, 3, 0,
 198                         2, 3, 0, 1,
 199                         3, 0, 1, 2,
 200
 201                         4, 13, 10, 19,  // 4 to 7
 202                         5, 14, 11, 16,
 203                         6, 15, 8, 17,
 204                         7, 12, 9, 18,
 205
 206                         8, 17, 6, 15,  // 8 to 11
 207                         9, 18, 7, 12,
 208                         10, 19, 4, 13,
 209                         11, 16, 5, 14,
 210
 211                         12, 9, 18, 7,  // 12 to 15
 212                         13, 10, 19, 4,
 213                         14, 11, 16, 5,
 214                         15, 8, 17, 6,
 215
 216                         16, 5, 14, 11,  // 16 to 19
 217                         17, 6, 15, 8,
 218                         18, 7, 12, 9,
 219                         19, 4, 13, 10,
 220
 221                         20, 23, 22, 21,  // 20 to 23
 222                         21, 20, 23, 22,
 223                         22, 21, 20, 23,
 224                         23, 22, 21, 20
 225                 };
 226                 u8 facedir = (param2 & 31) % 24;
 227                 u8 index = facedir * 4 + rot;
 228                 param2 &= ~31;
 229                 param2 |= rotate_facedir[index];
 230         } else if (cpt2 == CPT2_WALLMOUNTED ||
 231                         cpt2 == CPT2_COLORED_WALLMOUNTED) {
 232                 u8 wmountface = (param2 & 7);
 233                 if (wmountface <= 1)
 234                         return;
 235
 236                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 237                 param2 &= ~7;
 238                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 239         }
 240 }
 241
 242 void transformNodeBox(const MapNode &n, const NodeBox &nodebox,
 243                 INodeDefManager *nodemgr, std::vector<aabb3f> *p_boxes, u8 neighbors = 0)
 244 {
 245         std::vector<aabb3f> &boxes = *p_boxes;
 246
 247         if (nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED) {
 248                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 249                 int facedir = n.getFaceDir(nodemgr);
 250                 u8 axisdir = facedir>>2;
 251                 facedir&=0x03;
 252                 for (aabb3f box : fixed) {
 253                         if (nodebox.type == NODEBOX_LEVELED) {
 254                                 box.MaxEdge.Y = -BS/2 + BS*((float)1/LEVELED_MAX) * n.getLevel(nodemgr);
 255                         }
 256
 257                         switch (axisdir) {
 258                         case 0:
 259                                 if(facedir == 1)
 260                                 {
 261                                         box.MinEdge.rotateXZBy(-90);
 262                                         box.MaxEdge.rotateXZBy(-90);
 263                                 }
 264                                 else if(facedir == 2)
 265                                 {
 266                                         box.MinEdge.rotateXZBy(180);
 267                                         box.MaxEdge.rotateXZBy(180);
 268                                 }
 269                                 else if(facedir == 3)
 270                                 {
 271                                         box.MinEdge.rotateXZBy(90);
 272                                         box.MaxEdge.rotateXZBy(90);
 273                                 }
 274                                 break;
 275                         case 1: // 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 2: //z-
 295                                 box.MinEdge.rotateYZBy(-90);
 296                                 box.MaxEdge.rotateYZBy(-90);
 297                                 if(facedir == 1)
 298                                 {
 299                                         box.MinEdge.rotateXYBy(-90);
 300                                         box.MaxEdge.rotateXYBy(-90);
 301                                 }
 302                                 else if(facedir == 2)
 303                                 {
 304                                         box.MinEdge.rotateXYBy(180);
 305                                         box.MaxEdge.rotateXYBy(180);
 306                                 }
 307                                 else if(facedir == 3)
 308                                 {
 309                                         box.MinEdge.rotateXYBy(90);
 310                                         box.MaxEdge.rotateXYBy(90);
 311                                 }
 312                                 break;
 313                         case 3:  //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 4:  //x-
 333                                 box.MinEdge.rotateXYBy(90);
 334                                 box.MaxEdge.rotateXYBy(90);
 335                                 if(facedir == 1)
 336                                 {
 337                                         box.MinEdge.rotateYZBy(-90);
 338                                         box.MaxEdge.rotateYZBy(-90);
 339                                 }
 340                                 else if(facedir == 2)
 341                                 {
 342                                         box.MinEdge.rotateYZBy(180);
 343                                         box.MaxEdge.rotateYZBy(180);
 344                                 }
 345                                 else if(facedir == 3)
 346                                 {
 347                                         box.MinEdge.rotateYZBy(90);
 348                                         box.MaxEdge.rotateYZBy(90);
 349                                 }
 350                                 break;
 351                         case 5:
 352                                 box.MinEdge.rotateXYBy(-180);
 353                                 box.MaxEdge.rotateXYBy(-180);
 354                                 if(facedir == 1)
 355                                 {
 356                                         box.MinEdge.rotateXZBy(90);
 357                                         box.MaxEdge.rotateXZBy(90);
 358                                 }
 359                                 else if(facedir == 2)
 360                                 {
 361                                         box.MinEdge.rotateXZBy(180);
 362                                         box.MaxEdge.rotateXZBy(180);
 363                                 }
 364                                 else if(facedir == 3)
 365                                 {
 366                                         box.MinEdge.rotateXZBy(-90);
 367                                         box.MaxEdge.rotateXZBy(-90);
 368                                 }
 369                                 break;
 370                         default:
 371                                 break;
 372                         }
 373                         box.repair();
 374                         boxes.push_back(box);
 375                 }
 376         }
 377         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 378         {
 379                 v3s16 dir = n.getWallMountedDir(nodemgr);
 380
 381                 // top
 382                 if(dir == v3s16(0,1,0))
 383                 {
 384                         boxes.push_back(nodebox.wall_top);
 385                 }
 386                 // bottom
 387                 else if(dir == v3s16(0,-1,0))
 388                 {
 389                         boxes.push_back(nodebox.wall_bottom);
 390                 }
 391                 // side
 392                 else
 393                 {
 394                         v3f vertices[2] =
 395                         {
 396                                 nodebox.wall_side.MinEdge,
 397                                 nodebox.wall_side.MaxEdge
 398                         };
 399
 400                         for (v3f &vertex : vertices) {
 401                                 if(dir == v3s16(-1,0,0))
 402                                         vertex.rotateXZBy(0);
 403                                 if(dir == v3s16(1,0,0))
 404                                         vertex.rotateXZBy(180);
 405                                 if(dir == v3s16(0,0,-1))
 406                                         vertex.rotateXZBy(90);
 407                                 if(dir == v3s16(0,0,1))
 408                                         vertex.rotateXZBy(-90);
 409                         }
 410
 411                         aabb3f box = aabb3f(vertices[0]);
 412                         box.addInternalPoint(vertices[1]);
 413                         boxes.push_back(box);
 414                 }
 415         }
 416         else if (nodebox.type == NODEBOX_CONNECTED)
 417         {
 418                 size_t boxes_size = boxes.size();
 419                 boxes_size += nodebox.fixed.size();
 420                 if (neighbors & 1)
 421                         boxes_size += nodebox.connect_top.size();
 422                 if (neighbors & 2)
 423                         boxes_size += nodebox.connect_bottom.size();
 424                 if (neighbors & 4)
 425                         boxes_size += nodebox.connect_front.size();
 426                 if (neighbors & 8)
 427                         boxes_size += nodebox.connect_left.size();
 428                 if (neighbors & 16)
 429                         boxes_size += nodebox.connect_back.size();
 430                 if (neighbors & 32)
 431                         boxes_size += nodebox.connect_right.size();
 432                 boxes.reserve(boxes_size);
 433
 434 #define BOXESPUSHBACK(c) \
 435                 for (std::vector<aabb3f>::const_iterator \
 436                                 it = (c).begin(); \
 437                                 it != (c).end(); ++it) \
 438                         (boxes).push_back(*it);
 439
 440                 BOXESPUSHBACK(nodebox.fixed);
 441
 442                 if (neighbors & 1)
 443                         BOXESPUSHBACK(nodebox.connect_top);
 444                 if (neighbors & 2)
 445                         BOXESPUSHBACK(nodebox.connect_bottom);
 446                 if (neighbors & 4)
 447                         BOXESPUSHBACK(nodebox.connect_front);
 448                 if (neighbors & 8)
 449                         BOXESPUSHBACK(nodebox.connect_left);
 450                 if (neighbors & 16)
 451                         BOXESPUSHBACK(nodebox.connect_back);
 452                 if (neighbors & 32)
 453                         BOXESPUSHBACK(nodebox.connect_right);
 454         }
 455         else // NODEBOX_REGULAR
 456         {
 457                 boxes.emplace_back(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2);
 458         }
 459 }
 460
 461 static inline void getNeighborConnectingFace(
 462         const v3s16 &p, INodeDefManager *nodedef,
 463         Map *map, MapNode n, u8 bitmask, u8 *neighbors)
 464 {
 465         MapNode n2 = map->getNodeNoEx(p);
 466         if (nodedef->nodeboxConnects(n, n2, bitmask))
 467                 *neighbors |= bitmask;
 468 }
 469
 470 u8 MapNode::getNeighbors(v3s16 p, Map *map)
 471 {
 472         INodeDefManager *nodedef=map->getNodeDefManager();
 473         u8 neighbors = 0;
 474         const ContentFeatures &f = nodedef->get(*this);
 475         // locate possible neighboring nodes to connect to
 476         if (f.drawtype == NDT_NODEBOX && f.node_box.type == NODEBOX_CONNECTED) {
 477                 v3s16 p2 = p;
 478
 479                 p2.Y++;
 480                 getNeighborConnectingFace(p2, nodedef, map, *this, 1, &neighbors);
 481
 482                 p2 = p;
 483                 p2.Y--;
 484                 getNeighborConnectingFace(p2, nodedef, map, *this, 2, &neighbors);
 485
 486                 p2 = p;
 487                 p2.Z--;
 488                 getNeighborConnectingFace(p2, nodedef, map, *this, 4, &neighbors);
 489
 490                 p2 = p;
 491                 p2.X--;
 492                 getNeighborConnectingFace(p2, nodedef, map, *this, 8, &neighbors);
 493
 494                 p2 = p;
 495                 p2.Z++;
 496                 getNeighborConnectingFace(p2, nodedef, map, *this, 16, &neighbors);
 497
 498                 p2 = p;
 499                 p2.X++;
 500                 getNeighborConnectingFace(p2, nodedef, map, *this, 32, &neighbors);
 501         }
 502
 503         return neighbors;
 504 }
 505
 506 void MapNode::getNodeBoxes(INodeDefManager *nodemgr, std::vector<aabb3f> *boxes, u8 neighbors)
 507 {
 508         const ContentFeatures &f = nodemgr->get(*this);
 509         transformNodeBox(*this, f.node_box, nodemgr, boxes, neighbors);
 510 }
 511
 512 void MapNode::getCollisionBoxes(INodeDefManager *nodemgr, std::vector<aabb3f> *boxes, u8 neighbors)
 513 {
 514         const ContentFeatures &f = nodemgr->get(*this);
 515         if (f.collision_box.fixed.empty())
 516                 transformNodeBox(*this, f.node_box, nodemgr, boxes, neighbors);
 517         else
 518                 transformNodeBox(*this, f.collision_box, nodemgr, boxes, neighbors);
 519 }
 520
 521 void MapNode::getSelectionBoxes(INodeDefManager *nodemgr, std::vector<aabb3f> *boxes, u8 neighbors)
 522 {
 523         const ContentFeatures &f = nodemgr->get(*this);
 524         transformNodeBox(*this, f.selection_box, nodemgr, boxes, neighbors);
 525 }
 526
 527 u8 MapNode::getMaxLevel(INodeDefManager *nodemgr) const
 528 {
 529         const ContentFeatures &f = nodemgr->get(*this);
 530         // todo: after update in all games leave only if (f.param_type_2 ==
 531         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 532                 return LIQUID_LEVEL_MAX;
 533         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 534                 return LEVELED_MAX;
 535         return 0;
 536 }
 537
 538 u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 539 {
 540         const ContentFeatures &f = nodemgr->get(*this);
 541         // todo: after update in all games leave only if (f.param_type_2 ==
 542         if(f.liquid_type == LIQUID_SOURCE)
 543                 return LIQUID_LEVEL_SOURCE;
 544         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 545                 return getParam2() & LIQUID_LEVEL_MASK;
 546         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 547                 return getParam2() & LIQUID_LEVEL_MASK;
 548         if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 549                  u8 level = getParam2() & LEVELED_MASK;
 550                  if(level)
 551                         return level;
 552                  if(f.leveled > LEVELED_MAX)
 553                         return LEVELED_MAX;
 554                  return f.leveled; //default
 555         }
 556         return 0;
 557 }
 558
 559 u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 560 {
 561         u8 rest = 0;
 562         if (level < 1) {
 563                 setContent(CONTENT_AIR);
 564                 return 0;
 565         }
 566         const ContentFeatures &f = nodemgr->get(*this);
 567         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 568                 || f.liquid_type == LIQUID_FLOWING
 569                 || f.liquid_type == LIQUID_SOURCE) {
 570                 if (level >= LIQUID_LEVEL_SOURCE) {
 571                         rest = level - LIQUID_LEVEL_SOURCE;
 572                         setContent(nodemgr->getId(f.liquid_alternative_source));
 573                 } else {
 574                         setContent(nodemgr->getId(f.liquid_alternative_flowing));
 575                         setParam2(level & LIQUID_LEVEL_MASK);
 576                 }
 577         } else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
 578                 if (level > LEVELED_MAX) {
 579                         rest = level - LEVELED_MAX;
 580                         level = LEVELED_MAX;
 581                 }
 582                 setParam2(level & LEVELED_MASK);
 583         }
 584         return rest;
 585 }
 586
 587 u8 MapNode::addLevel(INodeDefManager *nodemgr, s8 add)
 588 {
 589         s8 level = getLevel(nodemgr);
 590         if (add == 0) level = 1;
 591         level += add;
 592         return setLevel(nodemgr, level);
 593 }
 594
 595 u32 MapNode::serializedLength(u8 version)
 596 {
 597         if(!ser_ver_supported(version))
 598                 throw VersionMismatchException("ERROR: MapNode format not supported");
 599
 600         if (version == 0)
 601                 return 1;
 602
 603         if (version <= 9)
 604                 return 2;
 605
 606         if (version <= 23)
 607                 return 3;
 608
 609         return 4;
 610 }
 611 void MapNode::serialize(u8 *dest, u8 version)
 612 {
 613         if(!ser_ver_supported(version))
 614                 throw VersionMismatchException("ERROR: MapNode format not supported");
 615
 616         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 617         // in memory; conversion just won't work in this direction.
 618         if(version < 24)
 619                 throw SerializationError("MapNode::serialize: serialization to "
 620                                 "version < 24 not possible");
 621
 622         writeU16(dest+0, param0);
 623         writeU8(dest+2, param1);
 624         writeU8(dest+3, param2);
 625 }
 626 void MapNode::deSerialize(u8 *source, u8 version)
 627 {
 628         if(!ser_ver_supported(version))
 629                 throw VersionMismatchException("ERROR: MapNode format not supported");
 630
 631         if(version <= 21)
 632         {
 633                 deSerialize_pre22(source, version);
 634                 return;
 635         }
 636
 637         if(version >= 24){
 638                 param0 = readU16(source+0);
 639                 param1 = readU8(source+2);
 640                 param2 = readU8(source+3);
 641         }else{
 642                 param0 = readU8(source+0);
 643                 param1 = readU8(source+1);
 644                 param2 = readU8(source+2);
 645                 if(param0 > 0x7F){
 646                         param0 |= ((param2&0xF0)<<4);
 647                         param2 &= 0x0F;
 648                 }
 649         }
 650 }
 651 void MapNode::serializeBulk(std::ostream &os, int version,
 652                 const MapNode *nodes, u32 nodecount,
 653                 u8 content_width, u8 params_width, bool compressed)
 654 {
 655         if (!ser_ver_supported(version))
 656                 throw VersionMismatchException("ERROR: MapNode format not supported");
 657
 658         sanity_check(content_width == 2);
 659         sanity_check(params_width == 2);
 660
 661         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 662         // in memory; conversion just won't work in this direction.
 663         if (version < 24)
 664                 throw SerializationError("MapNode::serializeBulk: serialization to "
 665                                 "version < 24 not possible");
 666
 667         size_t databuf_size = nodecount * (content_width + params_width);
 668         u8 *databuf = new u8[databuf_size];
 669
 670         u32 start1 = content_width * nodecount;
 671         u32 start2 = (content_width + 1) * nodecount;
 672
 673         // Serialize content
 674         for (u32 i = 0; i < nodecount; i++) {
 675                 writeU16(&databuf[i * 2], nodes[i].param0);
 676                 writeU8(&databuf[start1 + i], nodes[i].param1);
 677                 writeU8(&databuf[start2 + i], nodes[i].param2);
 678         }
 679
 680         /*
 681                 Compress data to output stream
 682         */
 683
 684         if (compressed)
 685                 compressZlib(databuf, databuf_size, os);
 686         else
 687                 os.write((const char*) &databuf[0], databuf_size);
 688
 689         delete [] databuf;
 690 }
 691
 692 // Deserialize bulk node data
 693 void MapNode::deSerializeBulk(std::istream &is, int version,
 694                 MapNode *nodes, u32 nodecount,
 695                 u8 content_width, u8 params_width, bool compressed)
 696 {
 697         if(!ser_ver_supported(version))
 698                 throw VersionMismatchException("ERROR: MapNode format not supported");
 699
 700         if (version < 22
 701                         || (content_width != 1 && content_width != 2)
 702                         || params_width != 2)
 703                 FATAL_ERROR("Deserialize bulk node data error");
 704
 705         // Uncompress or read data
 706         u32 len = nodecount * (content_width + params_width);
 707         SharedBuffer<u8> databuf(len);
 708         if(compressed)
 709         {
 710                 std::ostringstream os(std::ios_base::binary);
 711                 decompressZlib(is, os);
 712                 std::string s = os.str();
 713                 if(s.size() != len)
 714                         throw SerializationError("deSerializeBulkNodes: "
 715                                         "decompress resulted in invalid size");
 716                 memcpy(&databuf[0], s.c_str(), len);
 717         }
 718         else
 719         {
 720                 is.read((char*) &databuf[0], len);
 721                 if(is.eof() || is.fail())
 722                         throw SerializationError("deSerializeBulkNodes: "
 723                                         "failed to read bulk node data");
 724         }
 725
 726         // Deserialize content
 727         if(content_width == 1)
 728         {
 729                 for(u32 i=0; i<nodecount; i++)
 730                         nodes[i].param0 = readU8(&databuf[i]);
 731         }
 732         else if(content_width == 2)
 733         {
 734                 for(u32 i=0; i<nodecount; i++)
 735                         nodes[i].param0 = readU16(&databuf[i*2]);
 736         }
 737
 738         // Deserialize param1
 739         u32 start1 = content_width * nodecount;
 740         for(u32 i=0; i<nodecount; i++)
 741                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 742
 743         // Deserialize param2
 744         u32 start2 = (content_width + 1) * nodecount;
 745         if(content_width == 1)
 746         {
 747                 for(u32 i=0; i<nodecount; i++) {
 748                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 749                         if(nodes[i].param0 > 0x7F){
 750                                 nodes[i].param0 <<= 4;
 751                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 752                                 nodes[i].param2 &= 0x0F;
 753                         }
 754                 }
 755         }
 756         else if(content_width == 2)
 757         {
 758                 for(u32 i=0; i<nodecount; i++)
 759                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 760         }
 761 }
 762
 763 /*
 764         Legacy serialization
 765 */
 766 void MapNode::deSerialize_pre22(const u8 *source, u8 version)
 767 {
 768         if(version <= 1)
 769         {
 770                 param0 = source[0];
 771         }
 772         else if(version <= 9)
 773         {
 774                 param0 = source[0];
 775                 param1 = source[1];
 776         }
 777         else
 778         {
 779                 param0 = source[0];
 780                 param1 = source[1];
 781                 param2 = source[2];
 782                 if(param0 > 0x7f){
 783                         param0 <<= 4;
 784                         param0 |= (param2&0xf0)>>4;
 785                         param2 &= 0x0f;
 786                 }
 787         }
 788
 789         // Convert special values from old version to new
 790         if(version <= 19)
 791         {
 792                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 793                 // are 255 and 254
 794                 // Version 19 is fucked up with sometimes the old values and sometimes not
 795                 if(param0 == 255)
 796                         param0 = CONTENT_IGNORE;
 797                 else if(param0 == 254)
 798                         param0 = CONTENT_AIR;
 799         }
 800
 801         // Translate to our known version
 802         *this = mapnode_translate_to_internal(*this, version);
 803 }