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