src/client/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 "client.h"
  23 #include "clientenvironment.h"
  24 #include "clientsimpleobject.h"
  25 #include "clientmap.h"
  26 #include "scripting_client.h"
  27 #include "mapblock_mesh.h"
  28 #include "event.h"
  29 #include "collision.h"
  30 #include "nodedef.h"
  31 #include "profiler.h"
  32 #include "raycast.h"
  33 #include "voxelalgorithms.h"
  34 #include "settings.h"
  35 #include "content_cao.h"
  36 #include <algorithm>
  37 #include "client/renderingengine.h"
  38
  39 /*
  40         ClientEnvironment
  41 */
  42
  43 ClientEnvironment::ClientEnvironment(ClientMap *map,
  44         ITextureSource *texturesource, Client *client):
  45         Environment(client),
  46         m_map(map),
  47         m_texturesource(texturesource),
  48         m_client(client)
  49 {
  50 }
  51
  52 ClientEnvironment::~ClientEnvironment()
  53 {
  54         m_ao_manager.clear();
  55
  56         for (auto &simple_object : m_simple_objects) {
  57                 delete simple_object;
  58         }
  59
  60         // Drop/delete map
  61         m_map->drop();
  62
  63         delete m_local_player;
  64 }
  65
  66 Map & ClientEnvironment::getMap()
  67 {
  68         return *m_map;
  69 }
  70
  71 ClientMap & ClientEnvironment::getClientMap()
  72 {
  73         return *m_map;
  74 }
  75
  76 void ClientEnvironment::setLocalPlayer(LocalPlayer *player)
  77 {
  78         /*
  79                 It is a failure if already is a local player
  80         */
  81         FATAL_ERROR_IF(m_local_player != NULL,
  82                 "Local player already allocated");
  83
  84         m_local_player = player;
  85 }
  86
  87 void ClientEnvironment::step(float dtime)
  88 {
  89         /* Step time of day */
  90         stepTimeOfDay(dtime);
  91
  92         // Get some settings
  93         bool fly_allowed = m_client->checkLocalPrivilege("fly");
  94         bool free_move = fly_allowed && g_settings->getBool("free_move");
  95
  96         // Get local player
  97         LocalPlayer *lplayer = getLocalPlayer();
  98         assert(lplayer);
  99         // collision info queue
 100         std::vector<CollisionInfo> player_collisions;
 101
 102         /*
 103                 Get the speed the player is going
 104         */
 105         bool is_climbing = lplayer->is_climbing;
 106
 107         f32 player_speed = lplayer->getSpeed().getLength();
 108
 109         /*
 110                 Maximum position increment
 111         */
 112         //f32 position_max_increment = 0.05*BS;
 113         f32 position_max_increment = 0.1*BS;
 114
 115         // Maximum time increment (for collision detection etc)
 116         // time = distance / speed
 117         f32 dtime_max_increment = 1;
 118         if(player_speed > 0.001)
 119                 dtime_max_increment = position_max_increment / player_speed;
 120
 121         // Maximum time increment is 10ms or lower
 122         if(dtime_max_increment > 0.01)
 123                 dtime_max_increment = 0.01;
 124
 125         // Don't allow overly huge dtime
 126         if(dtime > 0.5)
 127                 dtime = 0.5;
 128
 129         f32 dtime_downcount = dtime;
 130
 131         /*
 132                 Stuff that has a maximum time increment
 133         */
 134
 135         u32 loopcount = 0;
 136         do
 137         {
 138                 loopcount++;
 139
 140                 f32 dtime_part;
 141                 if(dtime_downcount > dtime_max_increment)
 142                 {
 143                         dtime_part = dtime_max_increment;
 144                         dtime_downcount -= dtime_part;
 145                 }
 146                 else
 147                 {
 148                         dtime_part = dtime_downcount;
 149                         /*
 150                                 Setting this to 0 (no -=dtime_part) disables an infinite loop
 151                                 when dtime_part is so small that dtime_downcount -= dtime_part
 152                                 does nothing
 153                         */
 154                         dtime_downcount = 0;
 155                 }
 156
 157                 /*
 158                         Handle local player
 159                 */
 160
 161                 {
 162                         // Apply physics
 163                         if (!free_move && !is_climbing) {
 164                                 // Gravity
 165                                 v3f speed = lplayer->getSpeed();
 166                                 if (!lplayer->in_liquid)
 167                                         speed.Y -= lplayer->movement_gravity *
 168                                                 lplayer->physics_override_gravity * dtime_part * 2.0f;
 169
 170                                 // Liquid floating / sinking
 171                                 if (lplayer->in_liquid && !lplayer->swimming_vertical &&
 172                                                 !lplayer->swimming_pitch)
 173                                         speed.Y -= lplayer->movement_liquid_sink * dtime_part * 2.0f;
 174
 175                                 // Liquid resistance
 176                                 if (lplayer->in_liquid_stable || lplayer->in_liquid) {
 177                                         // How much the node's viscosity blocks movement, ranges
 178                                         // between 0 and 1. Should match the scale at which viscosity
 179                                         // increase affects other liquid attributes.
 180                                         static const f32 viscosity_factor = 0.3f;
 181
 182                                         v3f d_wanted = -speed / lplayer->movement_liquid_fluidity;
 183                                         f32 dl = d_wanted.getLength();
 184                                         if (dl > lplayer->movement_liquid_fluidity_smooth)
 185                                                 dl = lplayer->movement_liquid_fluidity_smooth;
 186
 187                                         dl *= (lplayer->liquid_viscosity * viscosity_factor) +
 188                                                 (1 - viscosity_factor);
 189                                         v3f d = d_wanted.normalize() * (dl * dtime_part * 100.0f);
 190                                         speed += d;
 191                                 }
 192
 193                                 lplayer->setSpeed(speed);
 194                         }
 195
 196                         /*
 197                                 Move the lplayer.
 198                                 This also does collision detection.
 199                         */
 200                         lplayer->move(dtime_part, this, position_max_increment,
 201                                 &player_collisions);
 202                 }
 203         } while (dtime_downcount > 0.001);
 204
 205         bool player_immortal = lplayer->getCAO() && lplayer->getCAO()->isImmortal();
 206
 207         for (const CollisionInfo &info : player_collisions) {
 208                 v3f speed_diff = info.new_speed - info.old_speed;;
 209                 // Handle only fall damage
 210                 // (because otherwise walking against something in fast_move kills you)
 211                 if (speed_diff.Y < 0 || info.old_speed.Y >= 0)
 212                         continue;
 213                 // Get rid of other components
 214                 speed_diff.X = 0;
 215                 speed_diff.Z = 0;
 216                 f32 pre_factor = 1; // 1 hp per node/s
 217                 f32 tolerance = BS*14; // 5 without damage
 218                 f32 post_factor = 1; // 1 hp per node/s
 219                 if (info.type == COLLISION_NODE) {
 220                         const ContentFeatures &f = m_client->ndef()->
 221                                 get(m_map->getNodeNoEx(info.node_p));
 222                         // Determine fall damage multiplier
 223                         int addp = itemgroup_get(f.groups, "fall_damage_add_percent");
 224                         pre_factor = 1.0f + (float)addp / 100.0f;
 225                 }
 226                 float speed = pre_factor * speed_diff.getLength();
 227                 if (speed > tolerance && !player_immortal) {
 228                         f32 damage_f = (speed - tolerance) / BS * post_factor;
 229                         u16 damage = (u16)MYMIN(damage_f + 0.5, U16_MAX);
 230                         if (damage != 0) {
 231                                 damageLocalPlayer(damage, true);
 232                                 m_client->getEventManager()->put(
 233                                         new SimpleTriggerEvent(MtEvent::PLAYER_FALLING_DAMAGE));
 234                         }
 235                 }
 236         }
 237
 238         if (m_client->modsLoaded())
 239                 m_script->environment_step(dtime);
 240
 241         // Update lighting on local player (used for wield item)
 242         u32 day_night_ratio = getDayNightRatio();
 243         {
 244                 // Get node at head
 245
 246                 // On InvalidPositionException, use this as default
 247                 // (day: LIGHT_SUN, night: 0)
 248                 MapNode node_at_lplayer(CONTENT_AIR, 0x0f, 0);
 249
 250                 v3s16 p = lplayer->getLightPosition();
 251                 node_at_lplayer = m_map->getNodeNoEx(p);
 252
 253                 u16 light = getInteriorLight(node_at_lplayer, 0, m_client->ndef());
 254                 final_color_blend(&lplayer->light_color, light, day_night_ratio);
 255         }
 256
 257         /*
 258                 Step active objects and update lighting of them
 259         */
 260
 261         bool update_lighting = m_active_object_light_update_interval.step(dtime, 0.21);
 262         auto cb_state = [this, dtime, update_lighting, day_night_ratio] (ClientActiveObject *cao) {
 263                 // Step object
 264                 cao->step(dtime, this);
 265
 266                 if (update_lighting) {
 267                         // Update lighting
 268                         u8 light = 0;
 269                         bool pos_ok;
 270
 271                         // Get node at head
 272                         v3s16 p = cao->getLightPosition();
 273                         MapNode n = this->m_map->getNodeNoEx(p, &pos_ok);
 274                         if (pos_ok)
 275                                 light = n.getLightBlend(day_night_ratio, m_client->ndef());
 276                         else
 277                                 light = blend_light(day_night_ratio, LIGHT_SUN, 0);
 278
 279                         cao->updateLight(light);
 280                 }
 281         };
 282
 283         m_ao_manager.step(dtime, cb_state);
 284
 285         /*
 286                 Step and handle simple objects
 287         */
 288         g_profiler->avg("CEnv: num of simple objects", m_simple_objects.size());
 289         for (auto i = m_simple_objects.begin(); i != m_simple_objects.end();) {
 290                 auto cur = i;
 291                 ClientSimpleObject *simple = *cur;
 292
 293                 simple->step(dtime);
 294                 if(simple->m_to_be_removed) {
 295                         delete simple;
 296                         i = m_simple_objects.erase(cur);
 297                 }
 298                 else {
 299                         ++i;
 300                 }
 301         }
 302 }
 303
 304 void ClientEnvironment::addSimpleObject(ClientSimpleObject *simple)
 305 {
 306         m_simple_objects.push_back(simple);
 307 }
 308
 309 GenericCAO* ClientEnvironment::getGenericCAO(u16 id)
 310 {
 311         ClientActiveObject *obj = getActiveObject(id);
 312         if (obj && obj->getType() == ACTIVEOBJECT_TYPE_GENERIC)
 313                 return (GenericCAO*) obj;
 314
 315         return NULL;
 316 }
 317
 318 bool isFreeClientActiveObjectId(const u16 id,
 319         ClientActiveObjectMap &objects)
 320 {
 321         return id != 0 && objects.find(id) == objects.end();
 322
 323 }
 324
 325 u16 getFreeClientActiveObjectId(ClientActiveObjectMap &objects)
 326 {
 327         // try to reuse id's as late as possible
 328         static u16 last_used_id = 0;
 329         u16 startid = last_used_id;
 330         for(;;) {
 331                 last_used_id ++;
 332                 if (isFreeClientActiveObjectId(last_used_id, objects))
 333                         return last_used_id;
 334
 335                 if (last_used_id == startid)
 336                         return 0;
 337         }
 338 }
 339
 340 u16 ClientEnvironment::addActiveObject(ClientActiveObject *object)
 341 {
 342         // Register object. If failed return zero id
 343         if (!m_ao_manager.registerObject(object))
 344                 return 0;
 345
 346         object->addToScene(m_texturesource);
 347
 348         // Update lighting immediately
 349         u8 light = 0;
 350         bool pos_ok;
 351
 352         // Get node at head
 353         v3s16 p = object->getLightPosition();
 354         MapNode n = m_map->getNodeNoEx(p, &pos_ok);
 355         if (pos_ok)
 356                 light = n.getLightBlend(getDayNightRatio(), m_client->ndef());
 357         else
 358                 light = blend_light(getDayNightRatio(), LIGHT_SUN, 0);
 359
 360         object->updateLight(light);
 361         return object->getId();
 362 }
 363
 364 void ClientEnvironment::addActiveObject(u16 id, u8 type,
 365         const std::string &init_data)
 366 {
 367         ClientActiveObject* obj =
 368                 ClientActiveObject::create((ActiveObjectType) type, m_client, this);
 369         if(obj == NULL)
 370         {
 371                 infostream<<"ClientEnvironment::addActiveObject(): "
 372                         <<"id="<<id<<" type="<<type<<": Couldn't create object"
 373                         <<std::endl;
 374                 return;
 375         }
 376
 377         obj->setId(id);
 378
 379         try
 380         {
 381                 obj->initialize(init_data);
 382         }
 383         catch(SerializationError &e)
 384         {
 385                 errorstream<<"ClientEnvironment::addActiveObject():"
 386                         <<" id="<<id<<" type="<<type
 387                         <<": SerializationError in initialize(): "
 388                         <<e.what()
 389                         <<": init_data="<<serializeJsonString(init_data)
 390                         <<std::endl;
 391         }
 392
 393         u16 new_id = addActiveObject(obj);
 394         // Object initialized:
 395         if ((obj = getActiveObject(new_id))) {
 396                 // Final step is to update all children which are already known
 397                 // Data provided by GENERIC_CMD_SPAWN_INFANT
 398                 const auto &children = obj->getAttachmentChildIds();
 399                 for (auto c_id : children) {
 400                         if (auto *o = getActiveObject(c_id))
 401                                 o->updateAttachments();
 402                 }
 403         }
 404 }
 405
 406 void ClientEnvironment::processActiveObjectMessage(u16 id, const std::string &data)
 407 {
 408         ClientActiveObject *obj = getActiveObject(id);
 409         if (obj == NULL) {
 410                 infostream << "ClientEnvironment::processActiveObjectMessage():"
 411                         << " got message for id=" << id << ", which doesn't exist."
 412                         << std::endl;
 413                 return;
 414         }
 415
 416         try {
 417                 obj->processMessage(data);
 418         } catch (SerializationError &e) {
 419                 errorstream<<"ClientEnvironment::processActiveObjectMessage():"
 420                         << " id=" << id << " type=" << obj->getType()
 421                         << " SerializationError in processMessage(): " << e.what()
 422                         << std::endl;
 423         }
 424 }
 425
 426 /*
 427         Callbacks for activeobjects
 428 */
 429
 430 void ClientEnvironment::damageLocalPlayer(u16 damage, bool handle_hp)
 431 {
 432         LocalPlayer *lplayer = getLocalPlayer();
 433         assert(lplayer);
 434
 435         if (handle_hp) {
 436                 if (lplayer->hp > damage)
 437                         lplayer->hp -= damage;
 438                 else
 439                         lplayer->hp = 0;
 440         }
 441
 442         ClientEnvEvent event;
 443         event.type = CEE_PLAYER_DAMAGE;
 444         event.player_damage.amount = damage;
 445         event.player_damage.send_to_server = handle_hp;
 446         m_client_event_queue.push(event);
 447 }
 448
 449 /*
 450         Client likes to call these
 451 */
 452
 453 ClientEnvEvent ClientEnvironment::getClientEnvEvent()
 454 {
 455         FATAL_ERROR_IF(m_client_event_queue.empty(),
 456                         "ClientEnvironment::getClientEnvEvent(): queue is empty");
 457
 458         ClientEnvEvent event = m_client_event_queue.front();
 459         m_client_event_queue.pop();
 460         return event;
 461 }
 462
 463 void ClientEnvironment::getSelectedActiveObjects(
 464         const core::line3d<f32> &shootline_on_map,
 465         std::vector<PointedThing> &objects)
 466 {
 467         std::vector<DistanceSortedActiveObject> allObjects;
 468         getActiveObjects(shootline_on_map.start,
 469                 shootline_on_map.getLength() + 10.0f, allObjects);
 470         const v3f line_vector = shootline_on_map.getVector();
 471
 472         for (const auto &allObject : allObjects) {
 473                 ClientActiveObject *obj = allObject.obj;
 474                 aabb3f selection_box;
 475                 if (!obj->getSelectionBox(&selection_box))
 476                         continue;
 477
 478                 const v3f &pos = obj->getPosition();
 479                 aabb3f offsetted_box(selection_box.MinEdge + pos,
 480                         selection_box.MaxEdge + pos);
 481
 482                 v3f current_intersection;
 483                 v3s16 current_normal;
 484                 if (boxLineCollision(offsetted_box, shootline_on_map.start, line_vector,
 485                                 &current_intersection, &current_normal)) {
 486                         objects.emplace_back((s16) obj->getId(), current_intersection, current_normal,
 487                                 (current_intersection - shootline_on_map.start).getLengthSQ());
 488                 }
 489         }
 490 }