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