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/directiontables.h"
  30 #include "util/numeric.h"
  31 #include <string>
  32 #include <sstream>
  33
  34 static const Rotation wallmounted_to_rot[] = {
  35         ROTATE_0, ROTATE_180, ROTATE_90, ROTATE_270
  36 };
  37
  38 static const u8 rot_to_wallmounted[] = {
  39         2, 4, 3, 5
  40 };
  41
  42
  43 /*
  44         MapNode
  45 */
  46
  47 // Create directly from a nodename
  48 // If name is unknown, sets CONTENT_IGNORE
  49 MapNode::MapNode(INodeDefManager *ndef, const std::string &name,
  50                 u8 a_param1, u8 a_param2)
  51 {
  52         content_t id = CONTENT_IGNORE;
  53         ndef->getId(name, id);
  54         param0 = id;
  55         param1 = a_param1;
  56         param2 = a_param2;
  57 }
  58
  59 void MapNode::getColor(const ContentFeatures &f, video::SColor *color) const
  60 {
  61         if (f.palette) {
  62                 *color = (*f.palette)[param2];
  63                 return;
  64         }
  65         *color = f.color;
  66 }
  67
  68 void MapNode::setLight(enum LightBank bank, u8 a_light, const ContentFeatures &f)
  69 {
  70         // If node doesn't contain light data, ignore this
  71         if(f.param_type != CPT_LIGHT)
  72                 return;
  73         if(bank == LIGHTBANK_DAY)
  74         {
  75                 param1 &= 0xf0;
  76                 param1 |= a_light & 0x0f;
  77         }
  78         else if(bank == LIGHTBANK_NIGHT)
  79         {
  80                 param1 &= 0x0f;
  81                 param1 |= (a_light & 0x0f)<<4;
  82         }
  83         else
  84                 assert("Invalid light bank" == NULL);
  85 }
  86
  87 void MapNode::setLight(enum LightBank bank, u8 a_light, INodeDefManager *nodemgr)
  88 {
  89         setLight(bank, a_light, nodemgr->get(*this));
  90 }
  91
  92 bool MapNode::isLightDayNightEq(INodeDefManager *nodemgr) const
  93 {
  94         const ContentFeatures &f = nodemgr->get(*this);
  95         bool isEqual;
  96
  97         if (f.param_type == CPT_LIGHT) {
  98                 u8 day   = MYMAX(f.light_source, param1 & 0x0f);
  99                 u8 night = MYMAX(f.light_source, (param1 >> 4) & 0x0f);
 100                 isEqual = day == night;
 101         } else {
 102                 isEqual = true;
 103         }
 104
 105         return isEqual;
 106 }
 107
 108 u8 MapNode::getLight(enum LightBank bank, INodeDefManager *nodemgr) const
 109 {
 110         // Select the brightest of [light source, propagated light]
 111         const ContentFeatures &f = nodemgr->get(*this);
 112
 113         u8 light;
 114         if(f.param_type == CPT_LIGHT)
 115                 light = bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f;
 116         else
 117                 light = 0;
 118
 119         return MYMAX(f.light_source, light);
 120 }
 121
 122 u8 MapNode::getLightRaw(enum LightBank bank, const ContentFeatures &f) const
 123 {
 124         if(f.param_type == CPT_LIGHT)
 125                 return bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f;
 126         return 0;
 127 }
 128
 129 u8 MapNode::getLightNoChecks(enum LightBank bank, const ContentFeatures *f) const
 130 {
 131         return MYMAX(f->light_source,
 132                      bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f);
 133 }
 134
 135 bool MapNode::getLightBanks(u8 &lightday, u8 &lightnight, INodeDefManager *nodemgr) const
 136 {
 137         // Select the brightest of [light source, propagated light]
 138         const ContentFeatures &f = nodemgr->get(*this);
 139         if(f.param_type == CPT_LIGHT)
 140         {
 141                 lightday = param1 & 0x0f;
 142                 lightnight = (param1>>4)&0x0f;
 143         }
 144         else
 145         {
 146                 lightday = 0;
 147                 lightnight = 0;
 148         }
 149         if(f.light_source > lightday)
 150                 lightday = f.light_source;
 151         if(f.light_source > lightnight)
 152                 lightnight = f.light_source;
 153         return f.param_type == CPT_LIGHT || f.light_source != 0;
 154 }
 155
 156 u8 MapNode::getFaceDir(INodeDefManager *nodemgr, bool allow_wallmounted) const
 157 {
 158         const ContentFeatures &f = nodemgr->get(*this);
 159         if (f.param_type_2 == CPT2_FACEDIR ||
 160                         f.param_type_2 == CPT2_COLORED_FACEDIR)
 161                 return (getParam2() & 0x1F) % 24;
 162         if (allow_wallmounted && (f.param_type_2 == CPT2_WALLMOUNTED ||
 163                         f.param_type_2 == CPT2_COLORED_WALLMOUNTED))
 164                 return wallmounted_to_facedir[getParam2() & 0x07];
 165         return 0;
 166 }
 167
 168 u8 MapNode::getWallMounted(INodeDefManager *nodemgr) const
 169 {
 170         const ContentFeatures &f = nodemgr->get(*this);
 171         if (f.param_type_2 == CPT2_WALLMOUNTED ||
 172                         f.param_type_2 == CPT2_COLORED_WALLMOUNTED)
 173                 return getParam2() & 0x07;
 174         return 0;
 175 }
 176
 177 v3s16 MapNode::getWallMountedDir(INodeDefManager *nodemgr) const
 178 {
 179         switch(getWallMounted(nodemgr))
 180         {
 181         case 0: default: return v3s16(0,1,0);
 182         case 1: return v3s16(0,-1,0);
 183         case 2: return v3s16(1,0,0);
 184         case 3: return v3s16(-1,0,0);
 185         case 4: return v3s16(0,0,1);
 186         case 5: return v3s16(0,0,-1);
 187         }
 188 }
 189
 190 void MapNode::rotateAlongYAxis(INodeDefManager *nodemgr, Rotation rot)
 191 {
 192         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 193
 194         if (cpt2 == CPT2_FACEDIR || cpt2 == CPT2_COLORED_FACEDIR) {
 195                 static const u8 rotate_facedir[24 * 4] = {
 196                         // Table value = rotated facedir
 197                         // Columns: 0, 90, 180, 270 degrees rotation around vertical axis
 198                         // Rotation is anticlockwise as seen from above (+Y)
 199
 200                         0, 1, 2, 3,  // Initial facedir 0 to 3
 201                         1, 2, 3, 0,
 202                         2, 3, 0, 1,
 203                         3, 0, 1, 2,
 204
 205                         4, 13, 10, 19,  // 4 to 7
 206                         5, 14, 11, 16,
 207                         6, 15, 8, 17,
 208                         7, 12, 9, 18,
 209
 210                         8, 17, 6, 15,  // 8 to 11
 211                         9, 18, 7, 12,
 212                         10, 19, 4, 13,
 213                         11, 16, 5, 14,
 214
 215                         12, 9, 18, 7,  // 12 to 15
 216                         13, 10, 19, 4,
 217                         14, 11, 16, 5,
 218                         15, 8, 17, 6,
 219
 220                         16, 5, 14, 11,  // 16 to 19
 221                         17, 6, 15, 8,
 222                         18, 7, 12, 9,
 223                         19, 4, 13, 10,
 224
 225                         20, 23, 22, 21,  // 20 to 23
 226                         21, 20, 23, 22,
 227                         22, 21, 20, 23,
 228                         23, 22, 21, 20
 229                 };
 230                 u8 facedir = (param2 & 31) % 24;
 231                 u8 index = facedir * 4 + rot;
 232                 param2 &= ~31;
 233                 param2 |= rotate_facedir[index];
 234         } else if (cpt2 == CPT2_WALLMOUNTED ||
 235                         cpt2 == CPT2_COLORED_WALLMOUNTED) {
 236                 u8 wmountface = (param2 & 7);
 237                 if (wmountface <= 1)
 238                         return;
 239
 240                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 241                 param2 &= ~7;
 242                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 243         }
 244 }
 245
 246 void transformNodeBox(const MapNode &n, const NodeBox &nodebox,
 247                 INodeDefManager *nodemgr, std::vector<aabb3f> *p_boxes, u8 neighbors = 0)
 248 {
 249         std::vector<aabb3f> &boxes = *p_boxes;
 250
 251         if (nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED) {
 252                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 253                 int facedir = n.getFaceDir(nodemgr, true);
 254                 u8 axisdir = facedir>>2;
 255                 facedir&=0x03;
 256                 for (aabb3f box : fixed) {
 257                         if (nodebox.type == NODEBOX_LEVELED)
 258                                 box.MaxEdge.Y = (-0.5f + n.getLevel(nodemgr) / 64.0f) * BS;
 259
 260                         switch (axisdir) {
 261                         case 0:
 262                                 if(facedir == 1)
 263                                 {
 264                                         box.MinEdge.rotateXZBy(-90);
 265                                         box.MaxEdge.rotateXZBy(-90);
 266                                 }
 267                                 else if(facedir == 2)
 268                                 {
 269                                         box.MinEdge.rotateXZBy(180);
 270                                         box.MaxEdge.rotateXZBy(180);
 271                                 }
 272                                 else if(facedir == 3)
 273                                 {
 274                                         box.MinEdge.rotateXZBy(90);
 275                                         box.MaxEdge.rotateXZBy(90);
 276                                 }
 277                                 break;
 278                         case 1: // z+
 279                                 box.MinEdge.rotateYZBy(90);
 280                                 box.MaxEdge.rotateYZBy(90);
 281                                 if(facedir == 1)
 282                                 {
 283                                         box.MinEdge.rotateXYBy(90);
 284                                         box.MaxEdge.rotateXYBy(90);
 285                                 }
 286                                 else if(facedir == 2)
 287                                 {
 288                                         box.MinEdge.rotateXYBy(180);
 289                                         box.MaxEdge.rotateXYBy(180);
 290                                 }
 291                                 else if(facedir == 3)
 292                                 {
 293                                         box.MinEdge.rotateXYBy(-90);
 294                                         box.MaxEdge.rotateXYBy(-90);
 295                                 }
 296                                 break;
 297                         case 2: //z-
 298                                 box.MinEdge.rotateYZBy(-90);
 299                                 box.MaxEdge.rotateYZBy(-90);
 300                                 if(facedir == 1)
 301                                 {
 302                                         box.MinEdge.rotateXYBy(-90);
 303                                         box.MaxEdge.rotateXYBy(-90);
 304                                 }
 305                                 else if(facedir == 2)
 306                                 {
 307                                         box.MinEdge.rotateXYBy(180);
 308                                         box.MaxEdge.rotateXYBy(180);
 309                                 }
 310                                 else if(facedir == 3)
 311                                 {
 312                                         box.MinEdge.rotateXYBy(90);
 313                                         box.MaxEdge.rotateXYBy(90);
 314                                 }
 315                                 break;
 316                         case 3:  //x+
 317                                 box.MinEdge.rotateXYBy(-90);
 318                                 box.MaxEdge.rotateXYBy(-90);
 319                                 if(facedir == 1)
 320                                 {
 321                                         box.MinEdge.rotateYZBy(90);
 322                                         box.MaxEdge.rotateYZBy(90);
 323                                 }
 324                                 else if(facedir == 2)
 325                                 {
 326                                         box.MinEdge.rotateYZBy(180);
 327                                         box.MaxEdge.rotateYZBy(180);
 328                                 }
 329                                 else if(facedir == 3)
 330                                 {
 331                                         box.MinEdge.rotateYZBy(-90);
 332                                         box.MaxEdge.rotateYZBy(-90);
 333                                 }
 334                                 break;
 335                         case 4:  //x-
 336                                 box.MinEdge.rotateXYBy(90);
 337                                 box.MaxEdge.rotateXYBy(90);
 338                                 if(facedir == 1)
 339                                 {
 340                                         box.MinEdge.rotateYZBy(-90);
 341                                         box.MaxEdge.rotateYZBy(-90);
 342                                 }
 343                                 else if(facedir == 2)
 344                                 {
 345                                         box.MinEdge.rotateYZBy(180);
 346                                         box.MaxEdge.rotateYZBy(180);
 347                                 }
 348                                 else if(facedir == 3)
 349                                 {
 350                                         box.MinEdge.rotateYZBy(90);
 351                                         box.MaxEdge.rotateYZBy(90);
 352                                 }
 353                                 break;
 354                         case 5:
 355                                 box.MinEdge.rotateXYBy(-180);
 356                                 box.MaxEdge.rotateXYBy(-180);
 357                                 if(facedir == 1)
 358                                 {
 359                                         box.MinEdge.rotateXZBy(90);
 360                                         box.MaxEdge.rotateXZBy(90);
 361                                 }
 362                                 else if(facedir == 2)
 363                                 {
 364                                         box.MinEdge.rotateXZBy(180);
 365                                         box.MaxEdge.rotateXZBy(180);
 366                                 }
 367                                 else if(facedir == 3)
 368                                 {
 369                                         box.MinEdge.rotateXZBy(-90);
 370                                         box.MaxEdge.rotateXZBy(-90);
 371                                 }
 372                                 break;
 373                         default:
 374                                 break;
 375                         }
 376                         box.repair();
 377                         boxes.push_back(box);
 378                 }
 379         }
 380         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 381         {
 382                 v3s16 dir = n.getWallMountedDir(nodemgr);
 383
 384                 // top
 385                 if(dir == v3s16(0,1,0))
 386                 {
 387                         boxes.push_back(nodebox.wall_top);
 388                 }
 389                 // bottom
 390                 else if(dir == v3s16(0,-1,0))
 391                 {
 392                         boxes.push_back(nodebox.wall_bottom);
 393                 }
 394                 // side
 395                 else
 396                 {
 397                         v3f vertices[2] =
 398                         {
 399                                 nodebox.wall_side.MinEdge,
 400                                 nodebox.wall_side.MaxEdge
 401                         };
 402
 403                         for (v3f &vertex : vertices) {
 404                                 if(dir == v3s16(-1,0,0))
 405                                         vertex.rotateXZBy(0);
 406                                 if(dir == v3s16(1,0,0))
 407                                         vertex.rotateXZBy(180);
 408                                 if(dir == v3s16(0,0,-1))
 409                                         vertex.rotateXZBy(90);
 410                                 if(dir == v3s16(0,0,1))
 411                                         vertex.rotateXZBy(-90);
 412                         }
 413
 414                         aabb3f box = aabb3f(vertices[0]);
 415                         box.addInternalPoint(vertices[1]);
 416                         boxes.push_back(box);
 417                 }
 418         }
 419         else if (nodebox.type == NODEBOX_CONNECTED)
 420         {
 421                 size_t boxes_size = boxes.size();
 422                 boxes_size += nodebox.fixed.size();
 423                 if (neighbors & 1)
 424                         boxes_size += nodebox.connect_top.size();
 425                 else
 426                         boxes_size += nodebox.disconnected_top.size();
 427
 428                 if (neighbors & 2)
 429                         boxes_size += nodebox.connect_bottom.size();
 430                 else
 431                         boxes_size += nodebox.disconnected_bottom.size();
 432
 433                 if (neighbors & 4)
 434                         boxes_size += nodebox.connect_front.size();
 435                 else
 436                         boxes_size += nodebox.disconnected_front.size();
 437
 438                 if (neighbors & 8)
 439                         boxes_size += nodebox.connect_left.size();
 440                 else
 441                         boxes_size += nodebox.disconnected_left.size();
 442
 443                 if (neighbors & 16)
 444                         boxes_size += nodebox.connect_back.size();
 445                 else
 446                         boxes_size += nodebox.disconnected_back.size();
 447
 448                 if (neighbors & 32)
 449                         boxes_size += nodebox.connect_right.size();
 450                 else
 451                         boxes_size += nodebox.disconnected_right.size();
 452
 453                 if (neighbors == 0)
 454                         boxes_size += nodebox.disconnected.size();
 455
 456                 if (neighbors < 4)
 457                         boxes_size += nodebox.disconnected_sides.size();
 458
 459                 boxes.reserve(boxes_size);
 460
 461 #define BOXESPUSHBACK(c) \
 462                 for (std::vector<aabb3f>::const_iterator \
 463                                 it = (c).begin(); \
 464                                 it != (c).end(); ++it) \
 465                         (boxes).push_back(*it);
 466
 467                 BOXESPUSHBACK(nodebox.fixed);
 468
 469                 if (neighbors & 1) {
 470                         BOXESPUSHBACK(nodebox.connect_top);
 471                 } else {
 472                         BOXESPUSHBACK(nodebox.disconnected_top);
 473                 }
 474
 475                 if (neighbors & 2) {
 476                         BOXESPUSHBACK(nodebox.connect_bottom);
 477                 } else {
 478                         BOXESPUSHBACK(nodebox.disconnected_bottom);
 479                 }
 480
 481                 if (neighbors & 4) {
 482                         BOXESPUSHBACK(nodebox.connect_front);
 483                 } else {
 484                         BOXESPUSHBACK(nodebox.disconnected_front);
 485                 }
 486
 487                 if (neighbors & 8) {
 488                         BOXESPUSHBACK(nodebox.connect_left);
 489                 } else {
 490                         BOXESPUSHBACK(nodebox.disconnected_left);
 491                 }
 492
 493                 if (neighbors & 16) {
 494                         BOXESPUSHBACK(nodebox.connect_back);
 495                 } else {
 496                         BOXESPUSHBACK(nodebox.disconnected_back);
 497                 }
 498
 499                 if (neighbors & 32) {
 500                         BOXESPUSHBACK(nodebox.connect_right);
 501                 } else {
 502                         BOXESPUSHBACK(nodebox.disconnected_right);
 503                 }
 504
 505                 if (neighbors == 0) {
 506                         BOXESPUSHBACK(nodebox.disconnected);
 507                 }
 508
 509                 if (neighbors < 4) {
 510                         BOXESPUSHBACK(nodebox.disconnected_sides);
 511                 }
 512
 513         }
 514         else // NODEBOX_REGULAR
 515         {
 516                 boxes.emplace_back(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2);
 517         }
 518 }
 519
 520 static inline void getNeighborConnectingFace(
 521         const v3s16 &p, INodeDefManager *nodedef,
 522         Map *map, MapNode n, u8 bitmask, u8 *neighbors)
 523 {
 524         MapNode n2 = map->getNodeNoEx(p);
 525         if (nodedef->nodeboxConnects(n, n2, bitmask))
 526                 *neighbors |= bitmask;
 527 }
 528
 529 u8 MapNode::getNeighbors(v3s16 p, Map *map)
 530 {
 531         INodeDefManager *nodedef=map->getNodeDefManager();
 532         u8 neighbors = 0;
 533         const ContentFeatures &f = nodedef->get(*this);
 534         // locate possible neighboring nodes to connect to
 535         if (f.drawtype == NDT_NODEBOX && f.node_box.type == NODEBOX_CONNECTED) {
 536                 v3s16 p2 = p;
 537
 538                 p2.Y++;
 539                 getNeighborConnectingFace(p2, nodedef, map, *this, 1, &neighbors);
 540
 541                 p2 = p;
 542                 p2.Y--;
 543                 getNeighborConnectingFace(p2, nodedef, map, *this, 2, &neighbors);
 544
 545                 p2 = p;
 546                 p2.Z--;
 547                 getNeighborConnectingFace(p2, nodedef, map, *this, 4, &neighbors);
 548
 549                 p2 = p;
 550                 p2.X--;
 551                 getNeighborConnectingFace(p2, nodedef, map, *this, 8, &neighbors);
 552
 553                 p2 = p;
 554                 p2.Z++;
 555                 getNeighborConnectingFace(p2, nodedef, map, *this, 16, &neighbors);
 556
 557                 p2 = p;
 558                 p2.X++;
 559                 getNeighborConnectingFace(p2, nodedef, map, *this, 32, &neighbors);
 560         }
 561
 562         return neighbors;
 563 }
 564
 565 void MapNode::getNodeBoxes(INodeDefManager *nodemgr, std::vector<aabb3f> *boxes, u8 neighbors)
 566 {
 567         const ContentFeatures &f = nodemgr->get(*this);
 568         transformNodeBox(*this, f.node_box, nodemgr, boxes, neighbors);
 569 }
 570
 571 void MapNode::getCollisionBoxes(INodeDefManager *nodemgr, std::vector<aabb3f> *boxes, u8 neighbors)
 572 {
 573         const ContentFeatures &f = nodemgr->get(*this);
 574         if (f.collision_box.fixed.empty())
 575                 transformNodeBox(*this, f.node_box, nodemgr, boxes, neighbors);
 576         else
 577                 transformNodeBox(*this, f.collision_box, nodemgr, boxes, neighbors);
 578 }
 579
 580 void MapNode::getSelectionBoxes(INodeDefManager *nodemgr, std::vector<aabb3f> *boxes, u8 neighbors)
 581 {
 582         const ContentFeatures &f = nodemgr->get(*this);
 583         transformNodeBox(*this, f.selection_box, nodemgr, boxes, neighbors);
 584 }
 585
 586 u8 MapNode::getMaxLevel(INodeDefManager *nodemgr) const
 587 {
 588         const ContentFeatures &f = nodemgr->get(*this);
 589         // todo: after update in all games leave only if (f.param_type_2 ==
 590         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 591                 return LIQUID_LEVEL_MAX;
 592         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 593                 return LEVELED_MAX;
 594         return 0;
 595 }
 596
 597 u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 598 {
 599         const ContentFeatures &f = nodemgr->get(*this);
 600         // todo: after update in all games leave only if (f.param_type_2 ==
 601         if(f.liquid_type == LIQUID_SOURCE)
 602                 return LIQUID_LEVEL_SOURCE;
 603         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 604                 return getParam2() & LIQUID_LEVEL_MASK;
 605         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 606                 return getParam2() & LIQUID_LEVEL_MASK;
 607         if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 608                  u8 level = getParam2() & LEVELED_MASK;
 609                  if(level)
 610                         return level;
 611                  if(f.leveled > LEVELED_MAX)
 612                         return LEVELED_MAX;
 613                  return f.leveled; //default
 614         }
 615         return 0;
 616 }
 617
 618 u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 619 {
 620         u8 rest = 0;
 621         if (level < 1) {
 622                 setContent(CONTENT_AIR);
 623                 return 0;
 624         }
 625         const ContentFeatures &f = nodemgr->get(*this);
 626         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 627                 || f.liquid_type == LIQUID_FLOWING
 628                 || f.liquid_type == LIQUID_SOURCE) {
 629                 if (level >= LIQUID_LEVEL_SOURCE) {
 630                         rest = level - LIQUID_LEVEL_SOURCE;
 631                         setContent(nodemgr->getId(f.liquid_alternative_source));
 632                 } else {
 633                         setContent(nodemgr->getId(f.liquid_alternative_flowing));
 634                         setParam2(level & LIQUID_LEVEL_MASK);
 635                 }
 636         } else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
 637                 if (level > LEVELED_MAX) {
 638                         rest = level - LEVELED_MAX;
 639                         level = LEVELED_MAX;
 640                 }
 641                 setParam2(level & LEVELED_MASK);
 642         }
 643         return rest;
 644 }
 645
 646 u8 MapNode::addLevel(INodeDefManager *nodemgr, s8 add)
 647 {
 648         s8 level = getLevel(nodemgr);
 649         if (add == 0) level = 1;
 650         level += add;
 651         return setLevel(nodemgr, level);
 652 }
 653
 654 u32 MapNode::serializedLength(u8 version)
 655 {
 656         if(!ser_ver_supported(version))
 657                 throw VersionMismatchException("ERROR: MapNode format not supported");
 658
 659         if (version == 0)
 660                 return 1;
 661
 662         if (version <= 9)
 663                 return 2;
 664
 665         if (version <= 23)
 666                 return 3;
 667
 668         return 4;
 669 }
 670 void MapNode::serialize(u8 *dest, u8 version)
 671 {
 672         if(!ser_ver_supported(version))
 673                 throw VersionMismatchException("ERROR: MapNode format not supported");
 674
 675         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 676         // in memory; conversion just won't work in this direction.
 677         if(version < 24)
 678                 throw SerializationError("MapNode::serialize: serialization to "
 679                                 "version < 24 not possible");
 680
 681         writeU16(dest+0, param0);
 682         writeU8(dest+2, param1);
 683         writeU8(dest+3, param2);
 684 }
 685 void MapNode::deSerialize(u8 *source, u8 version)
 686 {
 687         if(!ser_ver_supported(version))
 688                 throw VersionMismatchException("ERROR: MapNode format not supported");
 689
 690         if(version <= 21)
 691         {
 692                 deSerialize_pre22(source, version);
 693                 return;
 694         }
 695
 696         if(version >= 24){
 697                 param0 = readU16(source+0);
 698                 param1 = readU8(source+2);
 699                 param2 = readU8(source+3);
 700         }else{
 701                 param0 = readU8(source+0);
 702                 param1 = readU8(source+1);
 703                 param2 = readU8(source+2);
 704                 if(param0 > 0x7F){
 705                         param0 |= ((param2&0xF0)<<4);
 706                         param2 &= 0x0F;
 707                 }
 708         }
 709 }
 710 void MapNode::serializeBulk(std::ostream &os, int version,
 711                 const MapNode *nodes, u32 nodecount,
 712                 u8 content_width, u8 params_width, bool compressed)
 713 {
 714         if (!ser_ver_supported(version))
 715                 throw VersionMismatchException("ERROR: MapNode format not supported");
 716
 717         sanity_check(content_width == 2);
 718         sanity_check(params_width == 2);
 719
 720         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 721         // in memory; conversion just won't work in this direction.
 722         if (version < 24)
 723                 throw SerializationError("MapNode::serializeBulk: serialization to "
 724                                 "version < 24 not possible");
 725
 726         size_t databuf_size = nodecount * (content_width + params_width);
 727         u8 *databuf = new u8[databuf_size];
 728
 729         u32 start1 = content_width * nodecount;
 730         u32 start2 = (content_width + 1) * nodecount;
 731
 732         // Serialize content
 733         for (u32 i = 0; i < nodecount; i++) {
 734                 writeU16(&databuf[i * 2], nodes[i].param0);
 735                 writeU8(&databuf[start1 + i], nodes[i].param1);
 736                 writeU8(&databuf[start2 + i], nodes[i].param2);
 737         }
 738
 739         /*
 740                 Compress data to output stream
 741         */
 742
 743         if (compressed)
 744                 compressZlib(databuf, databuf_size, os);
 745         else
 746                 os.write((const char*) &databuf[0], databuf_size);
 747
 748         delete [] databuf;
 749 }
 750
 751 // Deserialize bulk node data
 752 void MapNode::deSerializeBulk(std::istream &is, int version,
 753                 MapNode *nodes, u32 nodecount,
 754                 u8 content_width, u8 params_width, bool compressed)
 755 {
 756         if(!ser_ver_supported(version))
 757                 throw VersionMismatchException("ERROR: MapNode format not supported");
 758
 759         if (version < 22
 760                         || (content_width != 1 && content_width != 2)
 761                         || params_width != 2)
 762                 FATAL_ERROR("Deserialize bulk node data error");
 763
 764         // Uncompress or read data
 765         u32 len = nodecount * (content_width + params_width);
 766         SharedBuffer<u8> databuf(len);
 767         if(compressed)
 768         {
 769                 std::ostringstream os(std::ios_base::binary);
 770                 decompressZlib(is, os);
 771                 std::string s = os.str();
 772                 if(s.size() != len)
 773                         throw SerializationError("deSerializeBulkNodes: "
 774                                         "decompress resulted in invalid size");
 775                 memcpy(&databuf[0], s.c_str(), len);
 776         }
 777         else
 778         {
 779                 is.read((char*) &databuf[0], len);
 780                 if(is.eof() || is.fail())
 781                         throw SerializationError("deSerializeBulkNodes: "
 782                                         "failed to read bulk node data");
 783         }
 784
 785         // Deserialize content
 786         if(content_width == 1)
 787         {
 788                 for(u32 i=0; i<nodecount; i++)
 789                         nodes[i].param0 = readU8(&databuf[i]);
 790         }
 791         else if(content_width == 2)
 792         {
 793                 for(u32 i=0; i<nodecount; i++)
 794                         nodes[i].param0 = readU16(&databuf[i*2]);
 795         }
 796
 797         // Deserialize param1
 798         u32 start1 = content_width * nodecount;
 799         for(u32 i=0; i<nodecount; i++)
 800                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 801
 802         // Deserialize param2
 803         u32 start2 = (content_width + 1) * nodecount;
 804         if(content_width == 1)
 805         {
 806                 for(u32 i=0; i<nodecount; i++) {
 807                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 808                         if(nodes[i].param0 > 0x7F){
 809                                 nodes[i].param0 <<= 4;
 810                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 811                                 nodes[i].param2 &= 0x0F;
 812                         }
 813                 }
 814         }
 815         else if(content_width == 2)
 816         {
 817                 for(u32 i=0; i<nodecount; i++)
 818                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 819         }
 820 }
 821
 822 /*
 823         Legacy serialization
 824 */
 825 void MapNode::deSerialize_pre22(const u8 *source, u8 version)
 826 {
 827         if(version <= 1)
 828         {
 829                 param0 = source[0];
 830         }
 831         else if(version <= 9)
 832         {
 833                 param0 = source[0];
 834                 param1 = source[1];
 835         }
 836         else
 837         {
 838                 param0 = source[0];
 839                 param1 = source[1];
 840                 param2 = source[2];
 841                 if(param0 > 0x7f){
 842                         param0 <<= 4;
 843                         param0 |= (param2&0xf0)>>4;
 844                         param2 &= 0x0f;
 845                 }
 846         }
 847
 848         // Convert special values from old version to new
 849         if(version <= 19)
 850         {
 851                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 852                 // are 255 and 254
 853                 // Version 19 is fucked up with sometimes the old values and sometimes not
 854                 if(param0 == 255)
 855                         param0 = CONTENT_IGNORE;
 856                 else if(param0 == 254)
 857                         param0 = CONTENT_AIR;
 858         }
 859
 860         // Translate to our known version
 861         *this = mapnode_translate_to_internal(*this, version);
 862 }