src/clientenvironment.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2017 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 "util/serialize.h"
  21 #include "util/pointedthing.h"
  22 #include "clientenvironment.h"
  23 #include "clientsimpleobject.h"
  24 #include "clientmap.h"
  25 #include "clientscripting.h"
  26 #include "mapblock_mesh.h"
  27 #include "event.h"
  28 #include "collision.h"
  29 #include "profiler.h"
  30 #include "raycast.h"
  31 #include "voxelalgorithms.h"
  32 #include "settings.h"
  33
  34 /*
  35         ClientEnvironment
  36 */
  37
  38 ClientEnvironment::ClientEnvironment(ClientMap *map, scene::ISceneManager *smgr,
  39         ITextureSource *texturesource, Client *client,
  40         IrrlichtDevice *irr):
  41         m_map(map),
  42         m_local_player(NULL),
  43         m_smgr(smgr),
  44         m_texturesource(texturesource),
  45         m_client(client),
  46         m_script(NULL),
  47         m_irr(irr)
  48 {
  49         char zero = 0;
  50         memset(attachement_parent_ids, zero, sizeof(attachement_parent_ids));
  51 }
  52
  53 ClientEnvironment::~ClientEnvironment()
  54 {
  55         // delete active objects
  56         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
  57                 i != m_active_objects.end(); ++i) {
  58                 delete i->second;
  59         }
  60
  61         for(std::vector<ClientSimpleObject*>::iterator
  62                 i = m_simple_objects.begin(); i != m_simple_objects.end(); ++i) {
  63                 delete *i;
  64         }
  65
  66         // Drop/delete map
  67         m_map->drop();
  68 }
  69
  70 Map & ClientEnvironment::getMap()
  71 {
  72         return *m_map;
  73 }
  74
  75 ClientMap & ClientEnvironment::getClientMap()
  76 {
  77         return *m_map;
  78 }
  79
  80 void ClientEnvironment::setLocalPlayer(LocalPlayer *player)
  81 {
  82         DSTACK(FUNCTION_NAME);
  83         /*
  84                 It is a failure if already is a local player
  85         */
  86         FATAL_ERROR_IF(m_local_player != NULL,
  87                 "Local player already allocated");
  88
  89         m_local_player = player;
  90 }
  91
  92 void ClientEnvironment::step(float dtime)
  93 {
  94         DSTACK(FUNCTION_NAME);
  95
  96         /* Step time of day */
  97         stepTimeOfDay(dtime);
  98
  99         // Get some settings
 100         bool fly_allowed = m_client->checkLocalPrivilege("fly");
 101         bool free_move = fly_allowed && g_settings->getBool("free_move");
 102
 103         // Get local player
 104         LocalPlayer *lplayer = getLocalPlayer();
 105         assert(lplayer);
 106         // collision info queue
 107         std::vector<CollisionInfo> player_collisions;
 108
 109         /*
 110                 Get the speed the player is going
 111         */
 112         bool is_climbing = lplayer->is_climbing;
 113
 114         f32 player_speed = lplayer->getSpeed().getLength();
 115
 116         /*
 117                 Maximum position increment
 118         */
 119         //f32 position_max_increment = 0.05*BS;
 120         f32 position_max_increment = 0.1*BS;
 121
 122         // Maximum time increment (for collision detection etc)
 123         // time = distance / speed
 124         f32 dtime_max_increment = 1;
 125         if(player_speed > 0.001)
 126                 dtime_max_increment = position_max_increment / player_speed;
 127
 128         // Maximum time increment is 10ms or lower
 129         if(dtime_max_increment > 0.01)
 130                 dtime_max_increment = 0.01;
 131
 132         // Don't allow overly huge dtime
 133         if(dtime > 0.5)
 134                 dtime = 0.5;
 135
 136         f32 dtime_downcount = dtime;
 137
 138         /*
 139                 Stuff that has a maximum time increment
 140         */
 141
 142         u32 loopcount = 0;
 143         do
 144         {
 145                 loopcount++;
 146
 147                 f32 dtime_part;
 148                 if(dtime_downcount > dtime_max_increment)
 149                 {
 150                         dtime_part = dtime_max_increment;
 151                         dtime_downcount -= dtime_part;
 152                 }
 153                 else
 154                 {
 155                         dtime_part = dtime_downcount;
 156                         /*
 157                                 Setting this to 0 (no -=dtime_part) disables an infinite loop
 158                                 when dtime_part is so small that dtime_downcount -= dtime_part
 159                                 does nothing
 160                         */
 161                         dtime_downcount = 0;
 162                 }
 163
 164                 /*
 165                         Handle local player
 166                 */
 167
 168                 {
 169                         // Apply physics
 170                         if(!free_move && !is_climbing)
 171                         {
 172                                 // Gravity
 173                                 v3f speed = lplayer->getSpeed();
 174                                 if(!lplayer->in_liquid)
 175                                         speed.Y -= lplayer->movement_gravity * lplayer->physics_override_gravity * dtime_part * 2;
 176
 177                                 // Liquid floating / sinking
 178                                 if(lplayer->in_liquid && !lplayer->swimming_vertical)
 179                                         speed.Y -= lplayer->movement_liquid_sink * dtime_part * 2;
 180
 181                                 // Liquid resistance
 182                                 if(lplayer->in_liquid_stable || lplayer->in_liquid)
 183                                 {
 184                                         // How much the node's viscosity blocks movement, ranges between 0 and 1
 185                                         // Should match the scale at which viscosity increase affects other liquid attributes
 186                                         const f32 viscosity_factor = 0.3;
 187
 188                                         v3f d_wanted = -speed / lplayer->movement_liquid_fluidity;
 189                                         f32 dl = d_wanted.getLength();
 190                                         if(dl > lplayer->movement_liquid_fluidity_smooth)
 191                                                 dl = lplayer->movement_liquid_fluidity_smooth;
 192                                         dl *= (lplayer->liquid_viscosity * viscosity_factor) + (1 - viscosity_factor);
 193
 194                                         v3f d = d_wanted.normalize() * dl;
 195                                         speed += d;
 196                                 }
 197
 198                                 lplayer->setSpeed(speed);
 199                         }
 200
 201                         /*
 202                                 Move the lplayer.
 203                                 This also does collision detection.
 204                         */
 205                         lplayer->move(dtime_part, this, position_max_increment,
 206                                 &player_collisions);
 207                 }
 208         }
 209         while(dtime_downcount > 0.001);
 210
 211         //std::cout<<"Looped "<<loopcount<<" times."<<std::endl;
 212
 213         for(std::vector<CollisionInfo>::iterator i = player_collisions.begin();
 214                 i != player_collisions.end(); ++i) {
 215                 CollisionInfo &info = *i;
 216                 v3f speed_diff = info.new_speed - info.old_speed;;
 217                 // Handle only fall damage
 218                 // (because otherwise walking against something in fast_move kills you)
 219                 if(speed_diff.Y < 0 || info.old_speed.Y >= 0)
 220                         continue;
 221                 // Get rid of other components
 222                 speed_diff.X = 0;
 223                 speed_diff.Z = 0;
 224                 f32 pre_factor = 1; // 1 hp per node/s
 225                 f32 tolerance = BS*14; // 5 without damage
 226                 f32 post_factor = 1; // 1 hp per node/s
 227                 if(info.type == COLLISION_NODE)
 228                 {
 229                         const ContentFeatures &f = m_client->ndef()->
 230                                 get(m_map->getNodeNoEx(info.node_p));
 231                         // Determine fall damage multiplier
 232                         int addp = itemgroup_get(f.groups, "fall_damage_add_percent");
 233                         pre_factor = 1.0 + (float)addp/100.0;
 234                 }
 235                 float speed = pre_factor * speed_diff.getLength();
 236                 if(speed > tolerance)
 237                 {
 238                         f32 damage_f = (speed - tolerance)/BS * post_factor;
 239                         u16 damage = (u16)(damage_f+0.5);
 240                         if(damage != 0){
 241                                 damageLocalPlayer(damage, true);
 242                                 MtEvent *e = new SimpleTriggerEvent("PlayerFallingDamage");
 243                                 m_client->event()->put(e);
 244                         }
 245                 }
 246         }
 247
 248         if (m_client->moddingEnabled()) {
 249                 m_script->environment_step(dtime);
 250         }
 251
 252         /*
 253                 A quick draft of lava damage
 254         */
 255         if(m_lava_hurt_interval.step(dtime, 1.0))
 256         {
 257                 v3f pf = lplayer->getPosition();
 258
 259                 // Feet, middle and head
 260                 v3s16 p1 = floatToInt(pf + v3f(0, BS*0.1, 0), BS);
 261                 MapNode n1 = m_map->getNodeNoEx(p1);
 262                 v3s16 p2 = floatToInt(pf + v3f(0, BS*0.8, 0), BS);
 263                 MapNode n2 = m_map->getNodeNoEx(p2);
 264                 v3s16 p3 = floatToInt(pf + v3f(0, BS*1.6, 0), BS);
 265                 MapNode n3 = m_map->getNodeNoEx(p3);
 266
 267                 u32 damage_per_second = 0;
 268                 damage_per_second = MYMAX(damage_per_second,
 269                         m_client->ndef()->get(n1).damage_per_second);
 270                 damage_per_second = MYMAX(damage_per_second,
 271                         m_client->ndef()->get(n2).damage_per_second);
 272                 damage_per_second = MYMAX(damage_per_second,
 273                         m_client->ndef()->get(n3).damage_per_second);
 274
 275                 if(damage_per_second != 0)
 276                 {
 277                         damageLocalPlayer(damage_per_second, true);
 278                 }
 279         }
 280
 281         // Protocol v29 make this behaviour obsolete
 282         if (getGameDef()->getProtoVersion() < 29) {
 283                 /*
 284                         Drowning
 285                 */
 286                 if (m_drowning_interval.step(dtime, 2.0)) {
 287                         v3f pf = lplayer->getPosition();
 288
 289                         // head
 290                         v3s16 p = floatToInt(pf + v3f(0, BS * 1.6, 0), BS);
 291                         MapNode n = m_map->getNodeNoEx(p);
 292                         ContentFeatures c = m_client->ndef()->get(n);
 293                         u8 drowning_damage = c.drowning;
 294                         if (drowning_damage > 0 && lplayer->hp > 0) {
 295                                 u16 breath = lplayer->getBreath();
 296                                 if (breath > 10) {
 297                                         breath = 11;
 298                                 }
 299                                 if (breath > 0) {
 300                                         breath -= 1;
 301                                 }
 302                                 lplayer->setBreath(breath);
 303                                 updateLocalPlayerBreath(breath);
 304                         }
 305
 306                         if (lplayer->getBreath() == 0 && drowning_damage > 0) {
 307                                 damageLocalPlayer(drowning_damage, true);
 308                         }
 309                 }
 310                 if (m_breathing_interval.step(dtime, 0.5)) {
 311                         v3f pf = lplayer->getPosition();
 312
 313                         // head
 314                         v3s16 p = floatToInt(pf + v3f(0, BS * 1.6, 0), BS);
 315                         MapNode n = m_map->getNodeNoEx(p);
 316                         ContentFeatures c = m_client->ndef()->get(n);
 317                         if (!lplayer->hp) {
 318                                 lplayer->setBreath(11);
 319                         } else if (c.drowning == 0) {
 320                                 u16 breath = lplayer->getBreath();
 321                                 if (breath <= 10) {
 322                                         breath += 1;
 323                                         lplayer->setBreath(breath);
 324                                         updateLocalPlayerBreath(breath);
 325                                 }
 326                         }
 327                 }
 328         }
 329
 330         // Update lighting on local player (used for wield item)
 331         u32 day_night_ratio = getDayNightRatio();
 332         {
 333                 // Get node at head
 334
 335                 // On InvalidPositionException, use this as default
 336                 // (day: LIGHT_SUN, night: 0)
 337                 MapNode node_at_lplayer(CONTENT_AIR, 0x0f, 0);
 338
 339                 v3s16 p = lplayer->getLightPosition();
 340                 node_at_lplayer = m_map->getNodeNoEx(p);
 341
 342                 u16 light = getInteriorLight(node_at_lplayer, 0, m_client->ndef());
 343                 final_color_blend(&lplayer->light_color, light, day_night_ratio);
 344         }
 345
 346         /*
 347                 Step active objects and update lighting of them
 348         */
 349
 350         g_profiler->avg("CEnv: num of objects", m_active_objects.size());
 351         bool update_lighting = m_active_object_light_update_interval.step(dtime, 0.21);
 352         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
 353                 i != m_active_objects.end(); ++i) {
 354                 ClientActiveObject* obj = i->second;
 355                 // Step object
 356                 obj->step(dtime, this);
 357
 358                 if(update_lighting)
 359                 {
 360                         // Update lighting
 361                         u8 light = 0;
 362                         bool pos_ok;
 363
 364                         // Get node at head
 365                         v3s16 p = obj->getLightPosition();
 366                         MapNode n = m_map->getNodeNoEx(p, &pos_ok);
 367                         if (pos_ok)
 368                                 light = n.getLightBlend(day_night_ratio, m_client->ndef());
 369                         else
 370                                 light = blend_light(day_night_ratio, LIGHT_SUN, 0);
 371
 372                         obj->updateLight(light);
 373                 }
 374         }
 375
 376         /*
 377                 Step and handle simple objects
 378         */
 379         g_profiler->avg("CEnv: num of simple objects", m_simple_objects.size());
 380         for(std::vector<ClientSimpleObject*>::iterator
 381                 i = m_simple_objects.begin(); i != m_simple_objects.end();) {
 382                 std::vector<ClientSimpleObject*>::iterator cur = i;
 383                 ClientSimpleObject *simple = *cur;
 384
 385                 simple->step(dtime);
 386                 if(simple->m_to_be_removed) {
 387                         delete simple;
 388                         i = m_simple_objects.erase(cur);
 389                 }
 390                 else {
 391                         ++i;
 392                 }
 393         }
 394 }
 395
 396 void ClientEnvironment::addSimpleObject(ClientSimpleObject *simple)
 397 {
 398         m_simple_objects.push_back(simple);
 399 }
 400
 401 GenericCAO* ClientEnvironment::getGenericCAO(u16 id)
 402 {
 403         ClientActiveObject *obj = getActiveObject(id);
 404         if (obj && obj->getType() == ACTIVEOBJECT_TYPE_GENERIC)
 405                 return (GenericCAO*) obj;
 406         else
 407                 return NULL;
 408 }
 409
 410 ClientActiveObject* ClientEnvironment::getActiveObject(u16 id)
 411 {
 412         UNORDERED_MAP<u16, ClientActiveObject*>::iterator n = m_active_objects.find(id);
 413         if (n == m_active_objects.end())
 414                 return NULL;
 415         return n->second;
 416 }
 417
 418 bool isFreeClientActiveObjectId(const u16 id,
 419         UNORDERED_MAP<u16, ClientActiveObject*> &objects)
 420 {
 421         if(id == 0)
 422                 return false;
 423
 424         return objects.find(id) == objects.end();
 425 }
 426
 427 u16 getFreeClientActiveObjectId(UNORDERED_MAP<u16, ClientActiveObject*> &objects)
 428 {
 429         //try to reuse id's as late as possible
 430         static u16 last_used_id = 0;
 431         u16 startid = last_used_id;
 432         for(;;) {
 433                 last_used_id ++;
 434                 if (isFreeClientActiveObjectId(last_used_id, objects))
 435                         return last_used_id;
 436
 437                 if (last_used_id == startid)
 438                         return 0;
 439         }
 440 }
 441
 442 u16 ClientEnvironment::addActiveObject(ClientActiveObject *object)
 443 {
 444         assert(object); // Pre-condition
 445         if(object->getId() == 0)
 446         {
 447                 u16 new_id = getFreeClientActiveObjectId(m_active_objects);
 448                 if(new_id == 0)
 449                 {
 450                         infostream<<"ClientEnvironment::addActiveObject(): "
 451                                 <<"no free ids available"<<std::endl;
 452                         delete object;
 453                         return 0;
 454                 }
 455                 object->setId(new_id);
 456         }
 457         if (!isFreeClientActiveObjectId(object->getId(), m_active_objects)) {
 458                 infostream<<"ClientEnvironment::addActiveObject(): "
 459                         <<"id is not free ("<<object->getId()<<")"<<std::endl;
 460                 delete object;
 461                 return 0;
 462         }
 463         infostream<<"ClientEnvironment::addActiveObject(): "
 464                 <<"added (id="<<object->getId()<<")"<<std::endl;
 465         m_active_objects[object->getId()] = object;
 466         object->addToScene(m_smgr, m_texturesource, m_irr);
 467         { // Update lighting immediately
 468                 u8 light = 0;
 469                 bool pos_ok;
 470
 471                 // Get node at head
 472                 v3s16 p = object->getLightPosition();
 473                 MapNode n = m_map->getNodeNoEx(p, &pos_ok);
 474                 if (pos_ok)
 475                         light = n.getLightBlend(getDayNightRatio(), m_client->ndef());
 476                 else
 477                         light = blend_light(getDayNightRatio(), LIGHT_SUN, 0);
 478
 479                 object->updateLight(light);
 480         }
 481         return object->getId();
 482 }
 483
 484 void ClientEnvironment::addActiveObject(u16 id, u8 type,
 485         const std::string &init_data)
 486 {
 487         ClientActiveObject* obj =
 488                 ClientActiveObject::create((ActiveObjectType) type, m_client, this);
 489         if(obj == NULL)
 490         {
 491                 infostream<<"ClientEnvironment::addActiveObject(): "
 492                         <<"id="<<id<<" type="<<type<<": Couldn't create object"
 493                         <<std::endl;
 494                 return;
 495         }
 496
 497         obj->setId(id);
 498
 499         try
 500         {
 501                 obj->initialize(init_data);
 502         }
 503         catch(SerializationError &e)
 504         {
 505                 errorstream<<"ClientEnvironment::addActiveObject():"
 506                         <<" id="<<id<<" type="<<type
 507                         <<": SerializationError in initialize(): "
 508                         <<e.what()
 509                         <<": init_data="<<serializeJsonString(init_data)
 510                         <<std::endl;
 511         }
 512
 513         addActiveObject(obj);
 514 }
 515
 516 void ClientEnvironment::removeActiveObject(u16 id)
 517 {
 518         verbosestream<<"ClientEnvironment::removeActiveObject(): "
 519                 <<"id="<<id<<std::endl;
 520         ClientActiveObject* obj = getActiveObject(id);
 521         if (obj == NULL) {
 522                 infostream<<"ClientEnvironment::removeActiveObject(): "
 523                         <<"id="<<id<<" not found"<<std::endl;
 524                 return;
 525         }
 526         obj->removeFromScene(true);
 527         delete obj;
 528         m_active_objects.erase(id);
 529 }
 530
 531 void ClientEnvironment::processActiveObjectMessage(u16 id, const std::string &data)
 532 {
 533         ClientActiveObject *obj = getActiveObject(id);
 534         if (obj == NULL) {
 535                 infostream << "ClientEnvironment::processActiveObjectMessage():"
 536                         << " got message for id=" << id << ", which doesn't exist."
 537                         << std::endl;
 538                 return;
 539         }
 540
 541         try {
 542                 obj->processMessage(data);
 543         } catch (SerializationError &e) {
 544                 errorstream<<"ClientEnvironment::processActiveObjectMessage():"
 545                         << " id=" << id << " type=" << obj->getType()
 546                         << " SerializationError in processMessage(): " << e.what()
 547                         << std::endl;
 548         }
 549 }
 550
 551 /*
 552         Callbacks for activeobjects
 553 */
 554
 555 void ClientEnvironment::damageLocalPlayer(u8 damage, bool handle_hp)
 556 {
 557         LocalPlayer *lplayer = getLocalPlayer();
 558         assert(lplayer);
 559
 560         if (handle_hp) {
 561                 if (lplayer->hp > damage)
 562                         lplayer->hp -= damage;
 563                 else
 564                         lplayer->hp = 0;
 565         }
 566
 567         ClientEnvEvent event;
 568         event.type = CEE_PLAYER_DAMAGE;
 569         event.player_damage.amount = damage;
 570         event.player_damage.send_to_server = handle_hp;
 571         m_client_event_queue.push(event);
 572 }
 573
 574 void ClientEnvironment::updateLocalPlayerBreath(u16 breath)
 575 {
 576         ClientEnvEvent event;
 577         event.type = CEE_PLAYER_BREATH;
 578         event.player_breath.amount = breath;
 579         m_client_event_queue.push(event);
 580 }
 581
 582 /*
 583         Client likes to call these
 584 */
 585
 586 void ClientEnvironment::getActiveObjects(v3f origin, f32 max_d,
 587         std::vector<DistanceSortedActiveObject> &dest)
 588 {
 589         for (UNORDERED_MAP<u16, ClientActiveObject*>::iterator i = m_active_objects.begin();
 590                 i != m_active_objects.end(); ++i) {
 591                 ClientActiveObject* obj = i->second;
 592
 593                 f32 d = (obj->getPosition() - origin).getLength();
 594
 595                 if(d > max_d)
 596                         continue;
 597
 598                 DistanceSortedActiveObject dso(obj, d);
 599
 600                 dest.push_back(dso);
 601         }
 602 }
 603
 604 ClientEnvEvent ClientEnvironment::getClientEvent()
 605 {
 606         ClientEnvEvent event;
 607         if(m_client_event_queue.empty())
 608                 event.type = CEE_NONE;
 609         else {
 610                 event = m_client_event_queue.front();
 611                 m_client_event_queue.pop();
 612         }
 613         return event;
 614 }
 615
 616 ClientActiveObject * ClientEnvironment::getSelectedActiveObject(
 617         const core::line3d<f32> &shootline_on_map, v3f *intersection_point,
 618         v3s16 *intersection_normal)
 619 {
 620         std::vector<DistanceSortedActiveObject> objects;
 621         getActiveObjects(shootline_on_map.start,
 622                 shootline_on_map.getLength() + 3, objects);
 623         const v3f line_vector = shootline_on_map.getVector();
 624
 625         // Sort them.
 626         // After this, the closest object is the first in the array.
 627         std::sort(objects.begin(), objects.end());
 628
 629         /* Because objects can have different nodebox sizes,
 630          * the object whose center is the nearest isn't necessarily
 631          * the closest one. If an object is found, don't stop
 632          * immediately. */
 633
 634         f32 d_min = shootline_on_map.getLength();
 635         ClientActiveObject *nearest_obj = NULL;
 636         for (u32 i = 0; i < objects.size(); i++) {
 637                 ClientActiveObject *obj = objects[i].obj;
 638
 639                 aabb3f *selection_box = obj->getSelectionBox();
 640                 if (selection_box == NULL)
 641                         continue;
 642
 643                 v3f pos = obj->getPosition();
 644
 645                 aabb3f offsetted_box(selection_box->MinEdge + pos,
 646                         selection_box->MaxEdge + pos);
 647
 648                 if (offsetted_box.getCenter().getDistanceFrom(
 649                         shootline_on_map.start) > d_min + 9.6f*BS) {
 650                         // Probably there is no active object that has bigger nodebox than
 651                         // (-5.5,-5.5,-5.5,5.5,5.5,5.5)
 652                         // 9.6 > 5.5*sqrt(3)
 653                         break;
 654                 }
 655
 656                 v3f current_intersection;
 657                 v3s16 current_normal;
 658                 if (boxLineCollision(offsetted_box, shootline_on_map.start, line_vector,
 659                         &current_intersection, &current_normal)) {
 660                         f32 d_current = current_intersection.getDistanceFrom(
 661                                 shootline_on_map.start);
 662                         if (d_current <= d_min) {
 663                                 d_min = d_current;
 664                                 nearest_obj = obj;
 665                                 *intersection_point = current_intersection;
 666                                 *intersection_normal = current_normal;
 667                         }
 668                 }
 669         }
 670
 671         return nearest_obj;
 672 }
 673
 674 /*
 675         Check if a node is pointable
 676 */
 677 static inline bool isPointableNode(const MapNode &n,
 678         INodeDefManager *ndef, bool liquids_pointable)
 679 {
 680         const ContentFeatures &features = ndef->get(n);
 681         return features.pointable ||
 682                 (liquids_pointable && features.isLiquid());
 683 }
 684
 685 PointedThing ClientEnvironment::getPointedThing(
 686         core::line3d<f32> shootline,
 687         bool liquids_pointable,
 688         bool look_for_object)
 689 {
 690         PointedThing result;
 691
 692         INodeDefManager *nodedef = m_map->getNodeDefManager();
 693
 694         core::aabbox3d<s16> maximal_exceed = nodedef->getSelectionBoxIntUnion();
 695         // The code needs to search these nodes
 696         core::aabbox3d<s16> search_range(-maximal_exceed.MaxEdge,
 697                 -maximal_exceed.MinEdge);
 698         // If a node is found, there might be a larger node behind.
 699         // To find it, we have to go further.
 700         s16 maximal_overcheck =
 701                 std::max(abs(search_range.MinEdge.X), abs(search_range.MaxEdge.X))
 702                         + std::max(abs(search_range.MinEdge.Y), abs(search_range.MaxEdge.Y))
 703                         + std::max(abs(search_range.MinEdge.Z), abs(search_range.MaxEdge.Z));
 704
 705         const v3f original_vector = shootline.getVector();
 706         const f32 original_length = original_vector.getLength();
 707
 708         f32 min_distance = original_length;
 709
 710         // First try to find an active object
 711         if (look_for_object) {
 712                 ClientActiveObject *selected_object = getSelectedActiveObject(
 713                         shootline, &result.intersection_point,
 714                         &result.intersection_normal);
 715
 716                 if (selected_object != NULL) {
 717                         min_distance =
 718                                 (result.intersection_point - shootline.start).getLength();
 719
 720                         result.type = POINTEDTHING_OBJECT;
 721                         result.object_id = selected_object->getId();
 722                 }
 723         }
 724
 725         // Reduce shootline
 726         if (original_length > 0) {
 727                 shootline.end = shootline.start
 728                         + shootline.getVector() / original_length * min_distance;
 729         }
 730
 731         // Try to find a node that is closer than the selected active
 732         // object (if it exists).
 733
 734         voxalgo::VoxelLineIterator iterator(shootline.start / BS,
 735                 shootline.getVector() / BS);
 736         v3s16 oldnode = iterator.m_current_node_pos;
 737         // Indicates that a node was found.
 738         bool is_node_found = false;
 739         // If a node is found, it is possible that there's a node
 740         // behind it with a large nodebox, so continue the search.
 741         u16 node_foundcounter = 0;
 742         // If a node is found, this is the center of the
 743         // first nodebox the shootline meets.
 744         v3f found_boxcenter(0, 0, 0);
 745         // The untested nodes are in this range.
 746         core::aabbox3d<s16> new_nodes;
 747         while (true) {
 748                 // Test the nodes around the current node in search_range.
 749                 new_nodes = search_range;
 750                 new_nodes.MinEdge += iterator.m_current_node_pos;
 751                 new_nodes.MaxEdge += iterator.m_current_node_pos;
 752
 753                 // Only check new nodes
 754                 v3s16 delta = iterator.m_current_node_pos - oldnode;
 755                 if (delta.X > 0)
 756                         new_nodes.MinEdge.X = new_nodes.MaxEdge.X;
 757                 else if (delta.X < 0)
 758                         new_nodes.MaxEdge.X = new_nodes.MinEdge.X;
 759                 else if (delta.Y > 0)
 760                         new_nodes.MinEdge.Y = new_nodes.MaxEdge.Y;
 761                 else if (delta.Y < 0)
 762                         new_nodes.MaxEdge.Y = new_nodes.MinEdge.Y;
 763                 else if (delta.Z > 0)
 764                         new_nodes.MinEdge.Z = new_nodes.MaxEdge.Z;
 765                 else if (delta.Z < 0)
 766                         new_nodes.MaxEdge.Z = new_nodes.MinEdge.Z;
 767
 768                 // For each untested node
 769                 for (s16 x = new_nodes.MinEdge.X; x <= new_nodes.MaxEdge.X; x++) {
 770                         for (s16 y = new_nodes.MinEdge.Y; y <= new_nodes.MaxEdge.Y; y++) {
 771                                 for (s16 z = new_nodes.MinEdge.Z; z <= new_nodes.MaxEdge.Z; z++) {
 772                                         MapNode n;
 773                                         v3s16 np(x, y, z);
 774                                         bool is_valid_position;
 775
 776                                         n = m_map->getNodeNoEx(np, &is_valid_position);
 777                                         if (!(is_valid_position &&
 778                                                 isPointableNode(n, nodedef, liquids_pointable))) {
 779                                                 continue;
 780                                         }
 781                                         std::vector<aabb3f> boxes;
 782                                         n.getSelectionBoxes(nodedef, &boxes,
 783                                                 n.getNeighbors(np, m_map));
 784
 785                                         v3f npf = intToFloat(np, BS);
 786                                         for (std::vector<aabb3f>::const_iterator i = boxes.begin();
 787                                                 i != boxes.end(); ++i) {
 788                                                 aabb3f box = *i;
 789                                                 box.MinEdge += npf;
 790                                                 box.MaxEdge += npf;
 791                                                 v3f intersection_point;
 792                                                 v3s16 intersection_normal;
 793                                                 if (!boxLineCollision(box, shootline.start, shootline.getVector(),
 794                                                         &intersection_point, &intersection_normal)) {
 795                                                         continue;
 796                                                 }
 797                                                 f32 distance = (intersection_point - shootline.start).getLength();
 798                                                 if (distance >= min_distance) {
 799                                                         continue;
 800                                                 }
 801                                                 result.type = POINTEDTHING_NODE;
 802                                                 result.node_undersurface = np;
 803                                                 result.intersection_point = intersection_point;
 804                                                 result.intersection_normal = intersection_normal;
 805                                                 found_boxcenter = box.getCenter();
 806                                                 min_distance = distance;
 807                                                 is_node_found = true;
 808                                         }
 809                                 }
 810                         }
 811                 }
 812                 if (is_node_found) {
 813                         node_foundcounter++;
 814                         if (node_foundcounter > maximal_overcheck) {
 815                                 break;
 816                         }
 817                 }
 818                 // Next node
 819                 if (iterator.hasNext()) {
 820                         oldnode = iterator.m_current_node_pos;
 821                         iterator.next();
 822                 } else {
 823                         break;
 824                 }
 825         }
 826
 827         if (is_node_found) {
 828                 // Set undersurface and abovesurface nodes
 829                 f32 d = 0.002 * BS;
 830                 v3f fake_intersection = result.intersection_point;
 831                 // Move intersection towards its source block.
 832                 if (fake_intersection.X < found_boxcenter.X)
 833                         fake_intersection.X += d;
 834                 else
 835                         fake_intersection.X -= d;
 836
 837                 if (fake_intersection.Y < found_boxcenter.Y)
 838                         fake_intersection.Y += d;
 839                 else
 840                         fake_intersection.Y -= d;
 841
 842                 if (fake_intersection.Z < found_boxcenter.Z)
 843                         fake_intersection.Z += d;
 844                 else
 845                         fake_intersection.Z -= d;
 846
 847                 result.node_real_undersurface = floatToInt(fake_intersection, BS);
 848                 result.node_abovesurface = result.node_real_undersurface
 849                         + result.intersection_normal;
 850         }
 851         return result;
 852 }