src/mg_decoration.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   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 "mg_decoration.h"
  21 #include "mg_schematic.h"
  22 #include "mapgen.h"
  23 #include "noise.h"
  24 #include "map.h"
  25 #include "log.h"
  26 #include "util/numeric.h"
  27
  28 FlagDesc flagdesc_deco[] = {
  29         {"place_center_x", DECO_PLACE_CENTER_X},
  30         {"place_center_y", DECO_PLACE_CENTER_Y},
  31         {"place_center_z", DECO_PLACE_CENTER_Z},
  32         {"force_placement", DECO_FORCE_PLACEMENT},
  33         {"liquid_surface", DECO_LIQUID_SURFACE},
  34         {NULL,             0}
  35 };
  36
  37
  38 ///////////////////////////////////////////////////////////////////////////////
  39
  40
  41 DecorationManager::DecorationManager(IGameDef *gamedef) :
  42         ObjDefManager(gamedef, OBJDEF_DECORATION)
  43 {
  44 }
  45
  46
  47 size_t DecorationManager::placeAllDecos(Mapgen *mg, u32 blockseed,
  48         v3s16 nmin, v3s16 nmax)
  49 {
  50         size_t nplaced = 0;
  51
  52         for (size_t i = 0; i != m_objects.size(); i++) {
  53                 Decoration *deco = (Decoration *)m_objects[i];
  54                 if (!deco)
  55                         continue;
  56
  57                 nplaced += deco->placeDeco(mg, blockseed, nmin, nmax);
  58                 blockseed++;
  59         }
  60
  61         return nplaced;
  62 }
  63
  64
  65 ///////////////////////////////////////////////////////////////////////////////
  66
  67
  68 Decoration::Decoration()
  69 {
  70         mapseed    = 0;
  71         fill_ratio = 0;
  72         sidelen    = 1;
  73         flags      = 0;
  74 }
  75
  76
  77 Decoration::~Decoration()
  78 {
  79 }
  80
  81
  82 void Decoration::resolveNodeNames()
  83 {
  84         getIdsFromNrBacklog(&c_place_on);
  85 }
  86
  87
  88 size_t Decoration::placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
  89 {
  90         PcgRandom ps(blockseed + 53);
  91         int carea_size = nmax.X - nmin.X + 1;
  92
  93         // Divide area into parts
  94         // If chunksize is changed it may no longer be divisable by sidelen
  95         if (carea_size % sidelen)
  96                 sidelen = carea_size;
  97
  98         s16 divlen = carea_size / sidelen;
  99         int area = sidelen * sidelen;
 100
 101         for (s16 z0 = 0; z0 < divlen; z0++)
 102         for (s16 x0 = 0; x0 < divlen; x0++) {
 103                 v2s16 p2d_center( // Center position of part of division
 104                         nmin.X + sidelen / 2 + sidelen * x0,
 105                         nmin.Z + sidelen / 2 + sidelen * z0
 106                 );
 107                 v2s16 p2d_min( // Minimum edge of part of division
 108                         nmin.X + sidelen * x0,
 109                         nmin.Z + sidelen * z0
 110                 );
 111                 v2s16 p2d_max( // Maximum edge of part of division
 112                         nmin.X + sidelen + sidelen * x0 - 1,
 113                         nmin.Z + sidelen + sidelen * z0 - 1
 114                 );
 115
 116                 // Amount of decorations
 117                 float nval = (flags & DECO_USE_NOISE) ?
 118                         NoisePerlin2D(&np, p2d_center.X, p2d_center.Y, mapseed) :
 119                         fill_ratio;
 120                 u32 deco_count = 0;
 121                 float deco_count_f = (float)area * nval;
 122                 if (deco_count_f >= 1.f) {
 123                         deco_count = deco_count_f;
 124                 } else if (deco_count_f > 0.f) {
 125                         // For low density decorations calculate a chance for 1 decoration
 126                         if (ps.range(1000) <= deco_count_f * 1000.f)
 127                                 deco_count = 1;
 128                 }
 129
 130                 for (u32 i = 0; i < deco_count; i++) {
 131                         s16 x = ps.range(p2d_min.X, p2d_max.X);
 132                         s16 z = ps.range(p2d_min.Y, p2d_max.Y);
 133
 134                         int mapindex = carea_size * (z - nmin.Z) + (x - nmin.X);
 135
 136                         s16 y = -MAX_MAP_GENERATION_LIMIT;
 137                         if (flags & DECO_LIQUID_SURFACE)
 138                                 y = mg->findLiquidSurface(v2s16(x, z), nmin.Y, nmax.Y);
 139                         else if (mg->heightmap)
 140                                 y = mg->heightmap[mapindex];
 141                         else
 142                                 y = mg->findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
 143
 144                         if (y < nmin.Y || y > nmax.Y ||
 145                                 y < y_min  || y > y_max)
 146                                 continue;
 147
 148                         if (y + getHeight() > mg->vm->m_area.MaxEdge.Y) {
 149                                 continue;
 150 #if 0
 151                                 printf("Decoration at (%d %d %d) cut off\n", x, y, z);
 152                                 //add to queue
 153                                 MutexAutoLock cutofflock(cutoff_mutex);
 154                                 cutoffs.push_back(CutoffData(x, y, z, height));
 155 #endif
 156                         }
 157
 158                         if (mg->biomemap) {
 159                                 UNORDERED_SET<u8>::iterator iter;
 160
 161                                 if (!biomes.empty()) {
 162                                         iter = biomes.find(mg->biomemap[mapindex]);
 163                                         if (iter == biomes.end())
 164                                                 continue;
 165                                 }
 166                         }
 167
 168                         v3s16 pos(x, y, z);
 169                         if (generate(mg->vm, &ps, pos))
 170                                 mg->gennotify.addEvent(GENNOTIFY_DECORATION, pos, index);
 171                 }
 172         }
 173
 174         return 0;
 175 }
 176
 177
 178 #if 0
 179 void Decoration::placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
 180 {
 181         PcgRandom pr(blockseed + 53);
 182         std::vector<CutoffData> handled_cutoffs;
 183
 184         // Copy over the cutoffs we're interested in so we don't needlessly hold a lock
 185         {
 186                 MutexAutoLock cutofflock(cutoff_mutex);
 187                 for (std::list<CutoffData>::iterator i = cutoffs.begin();
 188                         i != cutoffs.end(); ++i) {
 189                         CutoffData cutoff = *i;
 190                         v3s16 p    = cutoff.p;
 191                         s16 height = cutoff.height;
 192                         if (p.X < nmin.X || p.X > nmax.X ||
 193                                 p.Z < nmin.Z || p.Z > nmax.Z)
 194                                 continue;
 195                         if (p.Y + height < nmin.Y || p.Y > nmax.Y)
 196                                 continue;
 197
 198                         handled_cutoffs.push_back(cutoff);
 199                 }
 200         }
 201
 202         // Generate the cutoffs
 203         for (size_t i = 0; i != handled_cutoffs.size(); i++) {
 204                 v3s16 p    = handled_cutoffs[i].p;
 205                 s16 height = handled_cutoffs[i].height;
 206
 207                 if (p.Y + height > nmax.Y) {
 208                         //printf("Decoration at (%d %d %d) cut off again!\n", p.X, p.Y, p.Z);
 209                         cuttoffs.push_back(v3s16(p.X, p.Y, p.Z));
 210                 }
 211
 212                 generate(mg, &pr, nmax.Y, nmin.Y - p.Y, v3s16(p.X, nmin.Y, p.Z));
 213         }
 214
 215         // Remove cutoffs that were handled from the cutoff list
 216         {
 217                 MutexAutoLock cutofflock(cutoff_mutex);
 218                 for (std::list<CutoffData>::iterator i = cutoffs.begin();
 219                         i != cutoffs.end(); ++i) {
 220
 221                         for (size_t j = 0; j != handled_cutoffs.size(); j++) {
 222                                 CutoffData coff = *i;
 223                                 if (coff.p == handled_cutoffs[j].p)
 224                                         i = cutoffs.erase(i);
 225                         }
 226                 }
 227         }
 228 }
 229 #endif
 230
 231
 232 ///////////////////////////////////////////////////////////////////////////////
 233
 234
 235 void DecoSimple::resolveNodeNames()
 236 {
 237         Decoration::resolveNodeNames();
 238         getIdsFromNrBacklog(&c_decos);
 239         getIdsFromNrBacklog(&c_spawnby);
 240 }
 241
 242
 243 bool DecoSimple::canPlaceDecoration(MMVManip *vm, v3s16 p)
 244 {
 245         // Don't bother if there aren't any decorations to place
 246         if (c_decos.size() == 0)
 247                 return false;
 248
 249         u32 vi = vm->m_area.index(p);
 250
 251         // Check if the decoration can be placed on this node
 252         if (!CONTAINS(c_place_on, vm->m_data[vi].getContent()))
 253                 return false;
 254
 255         // Don't continue if there are no spawnby constraints
 256         if (nspawnby == -1)
 257                 return true;
 258
 259         int nneighs = 0;
 260         v3s16 dirs[16] = {
 261                 v3s16( 0, 0,  1),
 262                 v3s16( 0, 0, -1),
 263                 v3s16( 1, 0,  0),
 264                 v3s16(-1, 0,  0),
 265                 v3s16( 1, 0,  1),
 266                 v3s16(-1, 0,  1),
 267                 v3s16(-1, 0, -1),
 268                 v3s16( 1, 0, -1),
 269
 270                 v3s16( 0, 1,  1),
 271                 v3s16( 0, 1, -1),
 272                 v3s16( 1, 1,  0),
 273                 v3s16(-1, 1,  0),
 274                 v3s16( 1, 1,  1),
 275                 v3s16(-1, 1,  1),
 276                 v3s16(-1, 1, -1),
 277                 v3s16( 1, 1, -1)
 278         };
 279
 280         // Check a Moore neighborhood if there are enough spawnby nodes
 281         for (size_t i = 0; i != ARRLEN(dirs); i++) {
 282                 u32 index = vm->m_area.index(p + dirs[i]);
 283                 if (!vm->m_area.contains(index))
 284                         continue;
 285
 286                 if (CONTAINS(c_spawnby, vm->m_data[index].getContent()))
 287                         nneighs++;
 288         }
 289
 290         if (nneighs < nspawnby)
 291                 return false;
 292
 293         return true;
 294 }
 295
 296
 297 size_t DecoSimple::generate(MMVManip *vm, PcgRandom *pr, v3s16 p)
 298 {
 299         if (!canPlaceDecoration(vm, p))
 300                 return 0;
 301
 302         content_t c_place = c_decos[pr->range(0, c_decos.size() - 1)];
 303
 304         s16 height = (deco_height_max > 0) ?
 305                 pr->range(deco_height, deco_height_max) : deco_height;
 306
 307         bool force_placement = (flags & DECO_FORCE_PLACEMENT);
 308
 309         v3s16 em = vm->m_area.getExtent();
 310         u32 vi = vm->m_area.index(p);
 311         for (int i = 0; i < height; i++) {
 312                 vm->m_area.add_y(em, vi, 1);
 313
 314                 content_t c = vm->m_data[vi].getContent();
 315                 if (c != CONTENT_AIR && c != CONTENT_IGNORE &&
 316                                 !force_placement)
 317                         break;
 318
 319                 vm->m_data[vi] = MapNode(c_place);
 320         }
 321
 322         return 1;
 323 }
 324
 325
 326 int DecoSimple::getHeight()
 327 {
 328         return (deco_height_max > 0) ? deco_height_max : deco_height;
 329 }
 330
 331
 332 ///////////////////////////////////////////////////////////////////////////////
 333
 334
 335 DecoSchematic::DecoSchematic()
 336 {
 337         schematic = NULL;
 338 }
 339
 340
 341 size_t DecoSchematic::generate(MMVManip *vm, PcgRandom *pr, v3s16 p)
 342 {
 343         // Schematic could have been unloaded but not the decoration
 344         // In this case generate() does nothing (but doesn't *fail*)
 345         if (schematic == NULL)
 346                 return 0;
 347
 348         u32 vi = vm->m_area.index(p);
 349         content_t c = vm->m_data[vi].getContent();
 350         if (!CONTAINS(c_place_on, c))
 351                 return 0;
 352
 353         if (flags & DECO_PLACE_CENTER_X)
 354                 p.X -= (schematic->size.X - 1) / 2;
 355         if (flags & DECO_PLACE_CENTER_Y)
 356                 p.Y -= (schematic->size.Y - 1) / 2;
 357         if (flags & DECO_PLACE_CENTER_Z)
 358                 p.Z -= (schematic->size.Z - 1) / 2;
 359
 360         Rotation rot = (rotation == ROTATE_RAND) ?
 361                 (Rotation)pr->range(ROTATE_0, ROTATE_270) : rotation;
 362
 363         bool force_placement = (flags & DECO_FORCE_PLACEMENT);
 364
 365         schematic->blitToVManip(vm, p, rot, force_placement);
 366
 367         return 1;
 368 }
 369
 370
 371 int DecoSchematic::getHeight()
 372 {
 373         // Account for a schematic being sunk into the ground by flag.
 374         // When placed normally account for how a schematic is placed
 375         // sunk 1 node into the ground.
 376         return (flags & DECO_PLACE_CENTER_Y) ?
 377                 (schematic->size.Y - 1) / 2 : schematic->size.Y - 1;
 378 }