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 void MapNode::getColor(const ContentFeatures &f, video::SColor *color) const
  48 {
  49         if (f.palette) {
  50                 *color = (*f.palette)[param2];
  51                 return;
  52         }
  53         *color = f.color;
  54 }
  55
  56 void MapNode::setLight(LightBank bank, u8 a_light, const ContentFeatures &f) noexcept
  57 {
  58         // If node doesn't contain light data, ignore this
  59         if(f.param_type != CPT_LIGHT)
  60                 return;
  61         if(bank == LIGHTBANK_DAY)
  62         {
  63                 param1 &= 0xf0;
  64                 param1 |= a_light & 0x0f;
  65         }
  66         else if(bank == LIGHTBANK_NIGHT)
  67         {
  68                 param1 &= 0x0f;
  69                 param1 |= (a_light & 0x0f)<<4;
  70         }
  71         else
  72                 assert("Invalid light bank" == NULL);
  73 }
  74
  75 void MapNode::setLight(LightBank bank, u8 a_light, const NodeDefManager *nodemgr)
  76 {
  77         setLight(bank, a_light, nodemgr->get(*this));
  78 }
  79
  80 bool MapNode::isLightDayNightEq(const NodeDefManager *nodemgr) const
  81 {
  82         const ContentFeatures &f = nodemgr->get(*this);
  83         bool isEqual;
  84
  85         if (f.param_type == CPT_LIGHT) {
  86                 u8 day   = MYMAX(f.light_source, param1 & 0x0f);
  87                 u8 night = MYMAX(f.light_source, (param1 >> 4) & 0x0f);
  88                 isEqual = day == night;
  89         } else {
  90                 isEqual = true;
  91         }
  92
  93         return isEqual;
  94 }
  95
  96 u8 MapNode::getLight(LightBank bank, const NodeDefManager *nodemgr) const
  97 {
  98         // Select the brightest of [light source, propagated light]
  99         const ContentFeatures &f = nodemgr->get(*this);
 100
 101         u8 light;
 102         if(f.param_type == CPT_LIGHT)
 103                 light = bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f;
 104         else
 105                 light = 0;
 106
 107         return MYMAX(f.light_source, light);
 108 }
 109
 110 u8 MapNode::getLightRaw(LightBank bank, const ContentFeatures &f) const noexcept
 111 {
 112         if(f.param_type == CPT_LIGHT)
 113                 return bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f;
 114         return 0;
 115 }
 116
 117 u8 MapNode::getLightNoChecks(LightBank bank, const ContentFeatures *f) const noexcept
 118 {
 119         return MYMAX(f->light_source,
 120                      bank == LIGHTBANK_DAY ? param1 & 0x0f : (param1 >> 4) & 0x0f);
 121 }
 122
 123 bool MapNode::getLightBanks(u8 &lightday, u8 &lightnight,
 124         const NodeDefManager *nodemgr) const
 125 {
 126         // Select the brightest of [light source, propagated light]
 127         const ContentFeatures &f = nodemgr->get(*this);
 128         if(f.param_type == CPT_LIGHT)
 129         {
 130                 lightday = param1 & 0x0f;
 131                 lightnight = (param1>>4)&0x0f;
 132         }
 133         else
 134         {
 135                 lightday = 0;
 136                 lightnight = 0;
 137         }
 138         if(f.light_source > lightday)
 139                 lightday = f.light_source;
 140         if(f.light_source > lightnight)
 141                 lightnight = f.light_source;
 142         return f.param_type == CPT_LIGHT || f.light_source != 0;
 143 }
 144
 145 u8 MapNode::getFaceDir(const NodeDefManager *nodemgr,
 146         bool allow_wallmounted) const
 147 {
 148         const ContentFeatures &f = nodemgr->get(*this);
 149         if (f.param_type_2 == CPT2_FACEDIR ||
 150                         f.param_type_2 == CPT2_COLORED_FACEDIR)
 151                 return (getParam2() & 0x1F) % 24;
 152         if (allow_wallmounted && (f.param_type_2 == CPT2_WALLMOUNTED ||
 153                         f.param_type_2 == CPT2_COLORED_WALLMOUNTED))
 154                 return wallmounted_to_facedir[getParam2() & 0x07];
 155         return 0;
 156 }
 157
 158 u8 MapNode::getWallMounted(const NodeDefManager *nodemgr) const
 159 {
 160         const ContentFeatures &f = nodemgr->get(*this);
 161         if (f.param_type_2 == CPT2_WALLMOUNTED ||
 162                         f.param_type_2 == CPT2_COLORED_WALLMOUNTED)
 163                 return getParam2() & 0x07;
 164         return 0;
 165 }
 166
 167 v3s16 MapNode::getWallMountedDir(const NodeDefManager *nodemgr) const
 168 {
 169         switch(getWallMounted(nodemgr))
 170         {
 171         case 0: default: return v3s16(0,1,0);
 172         case 1: return v3s16(0,-1,0);
 173         case 2: return v3s16(1,0,0);
 174         case 3: return v3s16(-1,0,0);
 175         case 4: return v3s16(0,0,1);
 176         case 5: return v3s16(0,0,-1);
 177         }
 178 }
 179
 180 void MapNode::rotateAlongYAxis(const NodeDefManager *nodemgr, Rotation rot)
 181 {
 182         ContentParamType2 cpt2 = nodemgr->get(*this).param_type_2;
 183
 184         if (cpt2 == CPT2_FACEDIR || cpt2 == CPT2_COLORED_FACEDIR) {
 185                 static const u8 rotate_facedir[24 * 4] = {
 186                         // Table value = rotated facedir
 187                         // Columns: 0, 90, 180, 270 degrees rotation around vertical axis
 188                         // Rotation is anticlockwise as seen from above (+Y)
 189
 190                         0, 1, 2, 3,  // Initial facedir 0 to 3
 191                         1, 2, 3, 0,
 192                         2, 3, 0, 1,
 193                         3, 0, 1, 2,
 194
 195                         4, 13, 10, 19,  // 4 to 7
 196                         5, 14, 11, 16,
 197                         6, 15, 8, 17,
 198                         7, 12, 9, 18,
 199
 200                         8, 17, 6, 15,  // 8 to 11
 201                         9, 18, 7, 12,
 202                         10, 19, 4, 13,
 203                         11, 16, 5, 14,
 204
 205                         12, 9, 18, 7,  // 12 to 15
 206                         13, 10, 19, 4,
 207                         14, 11, 16, 5,
 208                         15, 8, 17, 6,
 209
 210                         16, 5, 14, 11,  // 16 to 19
 211                         17, 6, 15, 8,
 212                         18, 7, 12, 9,
 213                         19, 4, 13, 10,
 214
 215                         20, 23, 22, 21,  // 20 to 23
 216                         21, 20, 23, 22,
 217                         22, 21, 20, 23,
 218                         23, 22, 21, 20
 219                 };
 220                 u8 facedir = (param2 & 31) % 24;
 221                 u8 index = facedir * 4 + rot;
 222                 param2 &= ~31;
 223                 param2 |= rotate_facedir[index];
 224         } else if (cpt2 == CPT2_WALLMOUNTED ||
 225                         cpt2 == CPT2_COLORED_WALLMOUNTED) {
 226                 u8 wmountface = (param2 & 7);
 227                 if (wmountface <= 1)
 228                         return;
 229
 230                 Rotation oldrot = wallmounted_to_rot[wmountface - 2];
 231                 param2 &= ~7;
 232                 param2 |= rot_to_wallmounted[(oldrot - rot) & 3];
 233         }
 234 }
 235
 236 void transformNodeBox(const MapNode &n, const NodeBox &nodebox,
 237         const NodeDefManager *nodemgr, std::vector<aabb3f> *p_boxes,
 238         u8 neighbors = 0)
 239 {
 240         std::vector<aabb3f> &boxes = *p_boxes;
 241
 242         if (nodebox.type == NODEBOX_FIXED || nodebox.type == NODEBOX_LEVELED) {
 243                 const std::vector<aabb3f> &fixed = nodebox.fixed;
 244                 int facedir = n.getFaceDir(nodemgr, true);
 245                 u8 axisdir = facedir>>2;
 246                 facedir&=0x03;
 247                 for (aabb3f box : fixed) {
 248                         if (nodebox.type == NODEBOX_LEVELED)
 249                                 box.MaxEdge.Y = (-0.5f + n.getLevel(nodemgr) / 64.0f) * BS;
 250
 251                         switch (axisdir) {
 252                         case 0:
 253                                 if(facedir == 1)
 254                                 {
 255                                         box.MinEdge.rotateXZBy(-90);
 256                                         box.MaxEdge.rotateXZBy(-90);
 257                                 }
 258                                 else if(facedir == 2)
 259                                 {
 260                                         box.MinEdge.rotateXZBy(180);
 261                                         box.MaxEdge.rotateXZBy(180);
 262                                 }
 263                                 else if(facedir == 3)
 264                                 {
 265                                         box.MinEdge.rotateXZBy(90);
 266                                         box.MaxEdge.rotateXZBy(90);
 267                                 }
 268                                 break;
 269                         case 1: // z+
 270                                 box.MinEdge.rotateYZBy(90);
 271                                 box.MaxEdge.rotateYZBy(90);
 272                                 if(facedir == 1)
 273                                 {
 274                                         box.MinEdge.rotateXYBy(90);
 275                                         box.MaxEdge.rotateXYBy(90);
 276                                 }
 277                                 else if(facedir == 2)
 278                                 {
 279                                         box.MinEdge.rotateXYBy(180);
 280                                         box.MaxEdge.rotateXYBy(180);
 281                                 }
 282                                 else if(facedir == 3)
 283                                 {
 284                                         box.MinEdge.rotateXYBy(-90);
 285                                         box.MaxEdge.rotateXYBy(-90);
 286                                 }
 287                                 break;
 288                         case 2: //z-
 289                                 box.MinEdge.rotateYZBy(-90);
 290                                 box.MaxEdge.rotateYZBy(-90);
 291                                 if(facedir == 1)
 292                                 {
 293                                         box.MinEdge.rotateXYBy(-90);
 294                                         box.MaxEdge.rotateXYBy(-90);
 295                                 }
 296                                 else if(facedir == 2)
 297                                 {
 298                                         box.MinEdge.rotateXYBy(180);
 299                                         box.MaxEdge.rotateXYBy(180);
 300                                 }
 301                                 else if(facedir == 3)
 302                                 {
 303                                         box.MinEdge.rotateXYBy(90);
 304                                         box.MaxEdge.rotateXYBy(90);
 305                                 }
 306                                 break;
 307                         case 3:  //x+
 308                                 box.MinEdge.rotateXYBy(-90);
 309                                 box.MaxEdge.rotateXYBy(-90);
 310                                 if(facedir == 1)
 311                                 {
 312                                         box.MinEdge.rotateYZBy(90);
 313                                         box.MaxEdge.rotateYZBy(90);
 314                                 }
 315                                 else if(facedir == 2)
 316                                 {
 317                                         box.MinEdge.rotateYZBy(180);
 318                                         box.MaxEdge.rotateYZBy(180);
 319                                 }
 320                                 else if(facedir == 3)
 321                                 {
 322                                         box.MinEdge.rotateYZBy(-90);
 323                                         box.MaxEdge.rotateYZBy(-90);
 324                                 }
 325                                 break;
 326                         case 4:  //x-
 327                                 box.MinEdge.rotateXYBy(90);
 328                                 box.MaxEdge.rotateXYBy(90);
 329                                 if(facedir == 1)
 330                                 {
 331                                         box.MinEdge.rotateYZBy(-90);
 332                                         box.MaxEdge.rotateYZBy(-90);
 333                                 }
 334                                 else if(facedir == 2)
 335                                 {
 336                                         box.MinEdge.rotateYZBy(180);
 337                                         box.MaxEdge.rotateYZBy(180);
 338                                 }
 339                                 else if(facedir == 3)
 340                                 {
 341                                         box.MinEdge.rotateYZBy(90);
 342                                         box.MaxEdge.rotateYZBy(90);
 343                                 }
 344                                 break;
 345                         case 5:
 346                                 box.MinEdge.rotateXYBy(-180);
 347                                 box.MaxEdge.rotateXYBy(-180);
 348                                 if(facedir == 1)
 349                                 {
 350                                         box.MinEdge.rotateXZBy(90);
 351                                         box.MaxEdge.rotateXZBy(90);
 352                                 }
 353                                 else if(facedir == 2)
 354                                 {
 355                                         box.MinEdge.rotateXZBy(180);
 356                                         box.MaxEdge.rotateXZBy(180);
 357                                 }
 358                                 else if(facedir == 3)
 359                                 {
 360                                         box.MinEdge.rotateXZBy(-90);
 361                                         box.MaxEdge.rotateXZBy(-90);
 362                                 }
 363                                 break;
 364                         default:
 365                                 break;
 366                         }
 367                         box.repair();
 368                         boxes.push_back(box);
 369                 }
 370         }
 371         else if(nodebox.type == NODEBOX_WALLMOUNTED)
 372         {
 373                 v3s16 dir = n.getWallMountedDir(nodemgr);
 374
 375                 // top
 376                 if(dir == v3s16(0,1,0))
 377                 {
 378                         boxes.push_back(nodebox.wall_top);
 379                 }
 380                 // bottom
 381                 else if(dir == v3s16(0,-1,0))
 382                 {
 383                         boxes.push_back(nodebox.wall_bottom);
 384                 }
 385                 // side
 386                 else
 387                 {
 388                         v3f vertices[2] =
 389                         {
 390                                 nodebox.wall_side.MinEdge,
 391                                 nodebox.wall_side.MaxEdge
 392                         };
 393
 394                         for (v3f &vertex : vertices) {
 395                                 if(dir == v3s16(-1,0,0))
 396                                         vertex.rotateXZBy(0);
 397                                 if(dir == v3s16(1,0,0))
 398                                         vertex.rotateXZBy(180);
 399                                 if(dir == v3s16(0,0,-1))
 400                                         vertex.rotateXZBy(90);
 401                                 if(dir == v3s16(0,0,1))
 402                                         vertex.rotateXZBy(-90);
 403                         }
 404
 405                         aabb3f box = aabb3f(vertices[0]);
 406                         box.addInternalPoint(vertices[1]);
 407                         boxes.push_back(box);
 408                 }
 409         }
 410         else if (nodebox.type == NODEBOX_CONNECTED)
 411         {
 412                 size_t boxes_size = boxes.size();
 413                 boxes_size += nodebox.fixed.size();
 414                 if (neighbors & 1)
 415                         boxes_size += nodebox.connect_top.size();
 416                 else
 417                         boxes_size += nodebox.disconnected_top.size();
 418
 419                 if (neighbors & 2)
 420                         boxes_size += nodebox.connect_bottom.size();
 421                 else
 422                         boxes_size += nodebox.disconnected_bottom.size();
 423
 424                 if (neighbors & 4)
 425                         boxes_size += nodebox.connect_front.size();
 426                 else
 427                         boxes_size += nodebox.disconnected_front.size();
 428
 429                 if (neighbors & 8)
 430                         boxes_size += nodebox.connect_left.size();
 431                 else
 432                         boxes_size += nodebox.disconnected_left.size();
 433
 434                 if (neighbors & 16)
 435                         boxes_size += nodebox.connect_back.size();
 436                 else
 437                         boxes_size += nodebox.disconnected_back.size();
 438
 439                 if (neighbors & 32)
 440                         boxes_size += nodebox.connect_right.size();
 441                 else
 442                         boxes_size += nodebox.disconnected_right.size();
 443
 444                 if (neighbors == 0)
 445                         boxes_size += nodebox.disconnected.size();
 446
 447                 if (neighbors < 4)
 448                         boxes_size += nodebox.disconnected_sides.size();
 449
 450                 boxes.reserve(boxes_size);
 451
 452 #define BOXESPUSHBACK(c) \
 453                 for (std::vector<aabb3f>::const_iterator \
 454                                 it = (c).begin(); \
 455                                 it != (c).end(); ++it) \
 456                         (boxes).push_back(*it);
 457
 458                 BOXESPUSHBACK(nodebox.fixed);
 459
 460                 if (neighbors & 1) {
 461                         BOXESPUSHBACK(nodebox.connect_top);
 462                 } else {
 463                         BOXESPUSHBACK(nodebox.disconnected_top);
 464                 }
 465
 466                 if (neighbors & 2) {
 467                         BOXESPUSHBACK(nodebox.connect_bottom);
 468                 } else {
 469                         BOXESPUSHBACK(nodebox.disconnected_bottom);
 470                 }
 471
 472                 if (neighbors & 4) {
 473                         BOXESPUSHBACK(nodebox.connect_front);
 474                 } else {
 475                         BOXESPUSHBACK(nodebox.disconnected_front);
 476                 }
 477
 478                 if (neighbors & 8) {
 479                         BOXESPUSHBACK(nodebox.connect_left);
 480                 } else {
 481                         BOXESPUSHBACK(nodebox.disconnected_left);
 482                 }
 483
 484                 if (neighbors & 16) {
 485                         BOXESPUSHBACK(nodebox.connect_back);
 486                 } else {
 487                         BOXESPUSHBACK(nodebox.disconnected_back);
 488                 }
 489
 490                 if (neighbors & 32) {
 491                         BOXESPUSHBACK(nodebox.connect_right);
 492                 } else {
 493                         BOXESPUSHBACK(nodebox.disconnected_right);
 494                 }
 495
 496                 if (neighbors == 0) {
 497                         BOXESPUSHBACK(nodebox.disconnected);
 498                 }
 499
 500                 if (neighbors < 4) {
 501                         BOXESPUSHBACK(nodebox.disconnected_sides);
 502                 }
 503
 504         }
 505         else // NODEBOX_REGULAR
 506         {
 507                 boxes.emplace_back(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2);
 508         }
 509 }
 510
 511 static inline void getNeighborConnectingFace(
 512         const v3s16 &p, const NodeDefManager *nodedef,
 513         Map *map, MapNode n, u8 bitmask, u8 *neighbors)
 514 {
 515         MapNode n2 = map->getNode(p);
 516         if (nodedef->nodeboxConnects(n, n2, bitmask))
 517                 *neighbors |= bitmask;
 518 }
 519
 520 u8 MapNode::getNeighbors(v3s16 p, Map *map) const
 521 {
 522         const NodeDefManager *nodedef = map->getNodeDefManager();
 523         u8 neighbors = 0;
 524         const ContentFeatures &f = nodedef->get(*this);
 525         // locate possible neighboring nodes to connect to
 526         if (f.drawtype == NDT_NODEBOX && f.node_box.type == NODEBOX_CONNECTED) {
 527                 v3s16 p2 = p;
 528
 529                 p2.Y++;
 530                 getNeighborConnectingFace(p2, nodedef, map, *this, 1, &neighbors);
 531
 532                 p2 = p;
 533                 p2.Y--;
 534                 getNeighborConnectingFace(p2, nodedef, map, *this, 2, &neighbors);
 535
 536                 p2 = p;
 537                 p2.Z--;
 538                 getNeighborConnectingFace(p2, nodedef, map, *this, 4, &neighbors);
 539
 540                 p2 = p;
 541                 p2.X--;
 542                 getNeighborConnectingFace(p2, nodedef, map, *this, 8, &neighbors);
 543
 544                 p2 = p;
 545                 p2.Z++;
 546                 getNeighborConnectingFace(p2, nodedef, map, *this, 16, &neighbors);
 547
 548                 p2 = p;
 549                 p2.X++;
 550                 getNeighborConnectingFace(p2, nodedef, map, *this, 32, &neighbors);
 551         }
 552
 553         return neighbors;
 554 }
 555
 556 void MapNode::getNodeBoxes(const NodeDefManager *nodemgr,
 557         std::vector<aabb3f> *boxes, u8 neighbors) const
 558 {
 559         const ContentFeatures &f = nodemgr->get(*this);
 560         transformNodeBox(*this, f.node_box, nodemgr, boxes, neighbors);
 561 }
 562
 563 void MapNode::getCollisionBoxes(const NodeDefManager *nodemgr,
 564         std::vector<aabb3f> *boxes, u8 neighbors) const
 565 {
 566         const ContentFeatures &f = nodemgr->get(*this);
 567         if (f.collision_box.fixed.empty())
 568                 transformNodeBox(*this, f.node_box, nodemgr, boxes, neighbors);
 569         else
 570                 transformNodeBox(*this, f.collision_box, nodemgr, boxes, neighbors);
 571 }
 572
 573 void MapNode::getSelectionBoxes(const NodeDefManager *nodemgr,
 574         std::vector<aabb3f> *boxes, u8 neighbors) const
 575 {
 576         const ContentFeatures &f = nodemgr->get(*this);
 577         transformNodeBox(*this, f.selection_box, nodemgr, boxes, neighbors);
 578 }
 579
 580 u8 MapNode::getMaxLevel(const NodeDefManager *nodemgr) const
 581 {
 582         const ContentFeatures &f = nodemgr->get(*this);
 583         // todo: after update in all games leave only if (f.param_type_2 ==
 584         if( f.liquid_type == LIQUID_FLOWING || f.param_type_2 == CPT2_FLOWINGLIQUID)
 585                 return LIQUID_LEVEL_MAX;
 586         if(f.leveled || f.param_type_2 == CPT2_LEVELED)
 587                 return f.leveled_max;
 588         return 0;
 589 }
 590
 591 u8 MapNode::getLevel(const NodeDefManager *nodemgr) const
 592 {
 593         const ContentFeatures &f = nodemgr->get(*this);
 594         // todo: after update in all games leave only if (f.param_type_2 ==
 595         if(f.liquid_type == LIQUID_SOURCE)
 596                 return LIQUID_LEVEL_SOURCE;
 597         if (f.param_type_2 == CPT2_FLOWINGLIQUID)
 598                 return getParam2() & LIQUID_LEVEL_MASK;
 599         if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 600                 return getParam2() & LIQUID_LEVEL_MASK;
 601         if (f.param_type_2 == CPT2_LEVELED) {
 602                 u8 level = getParam2() & LEVELED_MASK;
 603                 if (level)
 604                         return level;
 605         }
 606         // Return static value from nodedef if param2 isn't used for level
 607         if (f.leveled > f.leveled_max)
 608                 return f.leveled_max;
 609         return f.leveled;
 610 }
 611
 612 s8 MapNode::setLevel(const NodeDefManager *nodemgr, s16 level)
 613 {
 614         s8 rest = 0;
 615         const ContentFeatures &f = nodemgr->get(*this);
 616         if (f.param_type_2 == CPT2_FLOWINGLIQUID
 617                         || f.liquid_type == LIQUID_FLOWING
 618                         || f.liquid_type == LIQUID_SOURCE) {
 619                 if (level <= 0) { // liquid can’t exist with zero level
 620                         setContent(CONTENT_AIR);
 621                         return 0;
 622                 }
 623                 if (level >= LIQUID_LEVEL_SOURCE) {
 624                         rest = level - LIQUID_LEVEL_SOURCE;
 625                         setContent(f.liquid_alternative_source_id);
 626                         setParam2(0);
 627                 } else {
 628                         setContent(f.liquid_alternative_flowing_id);
 629                         setParam2((level & LIQUID_LEVEL_MASK) | (getParam2() & ~LIQUID_LEVEL_MASK));
 630                 }
 631         } else if (f.param_type_2 == CPT2_LEVELED) {
 632                 if (level < 0) { // zero means default for a leveled nodebox
 633                         rest = level;
 634                         level = 0;
 635                 } else if (level > f.leveled_max) {
 636                         rest = level - f.leveled_max;
 637                         level = f.leveled_max;
 638                 }
 639                 setParam2((level & LEVELED_MASK) | (getParam2() & ~LEVELED_MASK));
 640         }
 641         return rest;
 642 }
 643
 644 s8 MapNode::addLevel(const NodeDefManager *nodemgr, s16 add)
 645 {
 646         s16 level = getLevel(nodemgr);
 647         level += add;
 648         return setLevel(nodemgr, level);
 649 }
 650
 651 u32 MapNode::serializedLength(u8 version)
 652 {
 653         if(!ser_ver_supported(version))
 654                 throw VersionMismatchException("ERROR: MapNode format not supported");
 655
 656         if (version == 0)
 657                 return 1;
 658
 659         if (version <= 9)
 660                 return 2;
 661
 662         if (version <= 23)
 663                 return 3;
 664
 665         return 4;
 666 }
 667 void MapNode::serialize(u8 *dest, u8 version) const
 668 {
 669         if(!ser_ver_supported(version))
 670                 throw VersionMismatchException("ERROR: MapNode format not supported");
 671
 672         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 673         // in memory; conversion just won't work in this direction.
 674         if(version < 24)
 675                 throw SerializationError("MapNode::serialize: serialization to "
 676                                 "version < 24 not possible");
 677
 678         writeU16(dest+0, param0);
 679         writeU8(dest+2, param1);
 680         writeU8(dest+3, param2);
 681 }
 682 void MapNode::deSerialize(u8 *source, u8 version)
 683 {
 684         if(!ser_ver_supported(version))
 685                 throw VersionMismatchException("ERROR: MapNode format not supported");
 686
 687         if(version <= 21)
 688         {
 689                 deSerialize_pre22(source, version);
 690                 return;
 691         }
 692
 693         if(version >= 24){
 694                 param0 = readU16(source+0);
 695                 param1 = readU8(source+2);
 696                 param2 = readU8(source+3);
 697         }else{
 698                 param0 = readU8(source+0);
 699                 param1 = readU8(source+1);
 700                 param2 = readU8(source+2);
 701                 if(param0 > 0x7F){
 702                         param0 |= ((param2&0xF0)<<4);
 703                         param2 &= 0x0F;
 704                 }
 705         }
 706 }
 707 void MapNode::serializeBulk(std::ostream &os, int version,
 708                 const MapNode *nodes, u32 nodecount,
 709                 u8 content_width, u8 params_width, bool compressed)
 710 {
 711         if (!ser_ver_supported(version))
 712                 throw VersionMismatchException("ERROR: MapNode format not supported");
 713
 714         sanity_check(content_width == 2);
 715         sanity_check(params_width == 2);
 716
 717         // Can't do this anymore; we have 16-bit dynamically allocated node IDs
 718         // in memory; conversion just won't work in this direction.
 719         if (version < 24)
 720                 throw SerializationError("MapNode::serializeBulk: serialization to "
 721                                 "version < 24 not possible");
 722
 723         size_t databuf_size = nodecount * (content_width + params_width);
 724         u8 *databuf = new u8[databuf_size];
 725
 726         u32 start1 = content_width * nodecount;
 727         u32 start2 = (content_width + 1) * nodecount;
 728
 729         // Serialize content
 730         for (u32 i = 0; i < nodecount; i++) {
 731                 writeU16(&databuf[i * 2], nodes[i].param0);
 732                 writeU8(&databuf[start1 + i], nodes[i].param1);
 733                 writeU8(&databuf[start2 + i], nodes[i].param2);
 734         }
 735
 736         /*
 737                 Compress data to output stream
 738         */
 739
 740         if (compressed)
 741                 compressZlib(databuf, databuf_size, os);
 742         else
 743                 os.write((const char*) &databuf[0], databuf_size);
 744
 745         delete [] databuf;
 746 }
 747
 748 // Deserialize bulk node data
 749 void MapNode::deSerializeBulk(std::istream &is, int version,
 750                 MapNode *nodes, u32 nodecount,
 751                 u8 content_width, u8 params_width, bool compressed)
 752 {
 753         if(!ser_ver_supported(version))
 754                 throw VersionMismatchException("ERROR: MapNode format not supported");
 755
 756         if (version < 22
 757                         || (content_width != 1 && content_width != 2)
 758                         || params_width != 2)
 759                 FATAL_ERROR("Deserialize bulk node data error");
 760
 761         // Uncompress or read data
 762         u32 len = nodecount * (content_width + params_width);
 763         SharedBuffer<u8> databuf(len);
 764         if(compressed)
 765         {
 766                 std::ostringstream os(std::ios_base::binary);
 767                 decompressZlib(is, os);
 768                 std::string s = os.str();
 769                 if(s.size() != len)
 770                         throw SerializationError("deSerializeBulkNodes: "
 771                                         "decompress resulted in invalid size");
 772                 memcpy(&databuf[0], s.c_str(), len);
 773         }
 774         else
 775         {
 776                 is.read((char*) &databuf[0], len);
 777                 if(is.eof() || is.fail())
 778                         throw SerializationError("deSerializeBulkNodes: "
 779                                         "failed to read bulk node data");
 780         }
 781
 782         // Deserialize content
 783         if(content_width == 1)
 784         {
 785                 for(u32 i=0; i<nodecount; i++)
 786                         nodes[i].param0 = readU8(&databuf[i]);
 787         }
 788         else if(content_width == 2)
 789         {
 790                 for(u32 i=0; i<nodecount; i++)
 791                         nodes[i].param0 = readU16(&databuf[i*2]);
 792         }
 793
 794         // Deserialize param1
 795         u32 start1 = content_width * nodecount;
 796         for(u32 i=0; i<nodecount; i++)
 797                 nodes[i].param1 = readU8(&databuf[start1 + i]);
 798
 799         // Deserialize param2
 800         u32 start2 = (content_width + 1) * nodecount;
 801         if(content_width == 1)
 802         {
 803                 for(u32 i=0; i<nodecount; i++) {
 804                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 805                         if(nodes[i].param0 > 0x7F){
 806                                 nodes[i].param0 <<= 4;
 807                                 nodes[i].param0 |= (nodes[i].param2&0xF0)>>4;
 808                                 nodes[i].param2 &= 0x0F;
 809                         }
 810                 }
 811         }
 812         else if(content_width == 2)
 813         {
 814                 for(u32 i=0; i<nodecount; i++)
 815                         nodes[i].param2 = readU8(&databuf[start2 + i]);
 816         }
 817 }
 818
 819 /*
 820         Legacy serialization
 821 */
 822 void MapNode::deSerialize_pre22(const u8 *source, u8 version)
 823 {
 824         if(version <= 1)
 825         {
 826                 param0 = source[0];
 827         }
 828         else if(version <= 9)
 829         {
 830                 param0 = source[0];
 831                 param1 = source[1];
 832         }
 833         else
 834         {
 835                 param0 = source[0];
 836                 param1 = source[1];
 837                 param2 = source[2];
 838                 if(param0 > 0x7f){
 839                         param0 <<= 4;
 840                         param0 |= (param2&0xf0)>>4;
 841                         param2 &= 0x0f;
 842                 }
 843         }
 844
 845         // Convert special values from old version to new
 846         if(version <= 19)
 847         {
 848                 // In these versions, CONTENT_IGNORE and CONTENT_AIR
 849                 // are 255 and 254
 850                 // Version 19 is messed up with sometimes the old values and sometimes not
 851                 if(param0 == 255)
 852                         param0 = CONTENT_IGNORE;
 853                 else if(param0 == 254)
 854                         param0 = CONTENT_AIR;
 855         }
 856
 857         // Translate to our known version
 858         *this = mapnode_translate_to_internal(*this, version);
 859 }