src/client/clientlauncher.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 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 "gui/mainmenumanager.h"
  21 #include "clouds.h"
  22 #include "server.h"
  23 #include "filesys.h"
  24 #include "gui/guiMainMenu.h"
  25 #include "game.h"
  26 #include "player.h"
  27 #include "chat.h"
  28 #include "gettext.h"
  29 #include "profiler.h"
  30 #include "serverlist.h"
  31 #include "gui/guiEngine.h"
  32 #include "fontengine.h"
  33 #include "clientlauncher.h"
  34 #include "version.h"
  35 #include "renderingengine.h"
  36 #include "network/networkexceptions.h"
  37
  38 #if USE_SOUND
  39 #include "sound_openal.h"
  40 #endif
  41 #ifdef __ANDROID__
  42 #include "porting.h"
  43 #endif
  44
  45 /* mainmenumanager.h
  46  */
  47 gui::IGUIEnvironment *guienv = nullptr;
  48 gui::IGUIStaticText *guiroot = nullptr;
  49 MainMenuManager g_menumgr;
  50
  51 bool isMenuActive()
  52 {
  53         return g_menumgr.menuCount() != 0;
  54 }
  55
  56 // Passed to menus to allow disconnecting and exiting
  57 MainGameCallback *g_gamecallback = nullptr;
  58
  59 #if 0
  60 // This can be helpful for the next code cleanup
  61 static void dump_start_data(const GameStartData &data)
  62 {
  63         std::cout <<
  64                 "\ndedicated   " << (int)data.is_dedicated_server <<
  65                 "\nport        " << data.socket_port <<
  66                 "\nworld_path  " << data.world_spec.path <<
  67                 "\nworld game  " << data.world_spec.gameid <<
  68                 "\ngame path   " << data.game_spec.path <<
  69                 "\nplayer name " << data.name <<
  70                 "\naddress     " << data.address << std::endl;
  71 }
  72 #endif
  73
  74 ClientLauncher::~ClientLauncher()
  75 {
  76         delete receiver;
  77
  78         delete input;
  79
  80         delete g_fontengine;
  81         delete g_gamecallback;
  82
  83         delete RenderingEngine::get_instance();
  84
  85 #if USE_SOUND
  86         g_sound_manager_singleton.reset();
  87 #endif
  88 }
  89
  90 bool ClientLauncher::run(GameStartData &start_data, const Settings &cmd_args)
  91 {
  92         /* This function is called when a client must be started.
  93          * Covered cases:
  94          *   - Singleplayer (address but map provided)
  95          *   - Join server (no map but address provided)
  96          *   - Local server (for main menu only)
  97          */
  98
  99         init_args(start_data, cmd_args);
 100
 101         // List video modes if requested
 102         if (list_video_modes)
 103                 return RenderingEngine::print_video_modes();
 104
 105 #if USE_SOUND
 106         if (g_settings->getBool("enable_sound"))
 107                 g_sound_manager_singleton = createSoundManagerSingleton();
 108 #endif
 109
 110         if (!init_engine()) {
 111                 errorstream << "Could not initialize game engine." << std::endl;
 112                 return false;
 113         }
 114
 115         // Speed tests (done after irrlicht is loaded to get timer)
 116         if (cmd_args.getFlag("speedtests")) {
 117                 dstream << "Running speed tests" << std::endl;
 118                 speed_tests();
 119                 return true;
 120         }
 121
 122         if (RenderingEngine::get_video_driver() == NULL) {
 123                 errorstream << "Could not initialize video driver." << std::endl;
 124                 return false;
 125         }
 126
 127         RenderingEngine::get_instance()->setupTopLevelWindow(PROJECT_NAME_C);
 128
 129         /*
 130                 This changes the minimum allowed number of vertices in a VBO.
 131                 Default is 500.
 132         */
 133         // driver->setMinHardwareBufferVertexCount(50);
 134
 135         // Create game callback for menus
 136         g_gamecallback = new MainGameCallback();
 137
 138         RenderingEngine::get_instance()->setResizable(true);
 139
 140         init_input();
 141
 142         RenderingEngine::get_scene_manager()->getParameters()->setAttribute(
 143                         scene::ALLOW_ZWRITE_ON_TRANSPARENT, true);
 144
 145         guienv = RenderingEngine::get_gui_env();
 146         skin = RenderingEngine::get_gui_env()->getSkin();
 147         skin->setColor(gui::EGDC_BUTTON_TEXT, video::SColor(255, 255, 255, 255));
 148         skin->setColor(gui::EGDC_3D_LIGHT, video::SColor(0, 0, 0, 0));
 149         skin->setColor(gui::EGDC_3D_HIGH_LIGHT, video::SColor(255, 30, 30, 30));
 150         skin->setColor(gui::EGDC_3D_SHADOW, video::SColor(255, 0, 0, 0));
 151         skin->setColor(gui::EGDC_HIGH_LIGHT, video::SColor(255, 70, 120, 50));
 152         skin->setColor(gui::EGDC_HIGH_LIGHT_TEXT, video::SColor(255, 255, 255, 255));
 153 #ifdef __ANDROID__
 154         float density = porting::getDisplayDensity();
 155         skin->setSize(gui::EGDS_CHECK_BOX_WIDTH, (s32)(17.0f * density));
 156         skin->setSize(gui::EGDS_SCROLLBAR_SIZE, (s32)(14.0f * density));
 157         skin->setSize(gui::EGDS_WINDOW_BUTTON_WIDTH, (s32)(15.0f * density));
 158         if (density > 1.5f) {
 159                 std::string sprite_path = porting::path_user + "/textures/base/pack/";
 160                 if (density > 3.5f)
 161                         sprite_path.append("checkbox_64.png");
 162                 else if (density > 2.0f)
 163                         sprite_path.append("checkbox_32.png");
 164                 else
 165                         sprite_path.append("checkbox_16.png");
 166                 // Texture dimensions should be a power of 2
 167                 gui::IGUISpriteBank *sprites = skin->getSpriteBank();
 168                 video::IVideoDriver *driver = RenderingEngine::get_video_driver();
 169                 video::ITexture *sprite_texture = driver->getTexture(sprite_path.c_str());
 170                 if (sprite_texture) {
 171                         s32 sprite_id = sprites->addTextureAsSprite(sprite_texture);
 172                         if (sprite_id != -1)
 173                                 skin->setIcon(gui::EGDI_CHECK_BOX_CHECKED, sprite_id);
 174                 }
 175         }
 176 #endif
 177         g_fontengine = new FontEngine(g_settings, guienv);
 178         FATAL_ERROR_IF(g_fontengine == NULL, "Font engine creation failed.");
 179
 180 #if (IRRLICHT_VERSION_MAJOR >= 1 && IRRLICHT_VERSION_MINOR >= 8) ||                      \
 181                 IRRLICHT_VERSION_MAJOR >= 2
 182         // Irrlicht 1.8 input colours
 183         skin->setColor(gui::EGDC_EDITABLE, video::SColor(255, 128, 128, 128));
 184         skin->setColor(gui::EGDC_FOCUSED_EDITABLE, video::SColor(255, 96, 134, 49));
 185 #endif
 186
 187         // Create the menu clouds
 188         if (!g_menucloudsmgr)
 189                 g_menucloudsmgr = RenderingEngine::get_scene_manager()
 190                                                   ->createNewSceneManager();
 191         if (!g_menuclouds)
 192                 g_menuclouds = new Clouds(g_menucloudsmgr, -1, rand());
 193         g_menuclouds->setHeight(100.0f);
 194         g_menuclouds->update(v3f(0, 0, 0), video::SColor(255, 240, 240, 255));
 195         scene::ICameraSceneNode *camera;
 196         camera = g_menucloudsmgr->addCameraSceneNode(NULL, v3f(0, 0, 0), v3f(0, 60, 100));
 197         camera->setFarValue(10000);
 198
 199         /*
 200                 GUI stuff
 201         */
 202
 203         ChatBackend chat_backend;
 204
 205         // If an error occurs, this is set to something by menu().
 206         // It is then displayed before the menu shows on the next call to menu()
 207         std::string error_message;
 208         bool reconnect_requested = false;
 209
 210         bool first_loop = true;
 211
 212         /*
 213                 Menu-game loop
 214         */
 215         bool retval = true;
 216         bool *kill = porting::signal_handler_killstatus();
 217
 218         while (RenderingEngine::run() && !*kill && !g_gamecallback->shutdown_requested) {
 219                 // Set the window caption
 220                 const wchar_t *text = wgettext("Main Menu");
 221                 RenderingEngine::get_raw_device()->setWindowCaption(
 222                                 (utf8_to_wide(PROJECT_NAME_C) + L" " +
 223                                                 utf8_to_wide(g_version_hash) + L" [" +
 224                                                 text + L"]")
 225                                                 .c_str());
 226                 delete[] text;
 227
 228                 try { // This is used for catching disconnects
 229
 230                         RenderingEngine::get_gui_env()->clear();
 231
 232                         /*
 233                                 We need some kind of a root node to be able to add
 234                                 custom gui elements directly on the screen.
 235                                 Otherwise they won't be automatically drawn.
 236                         */
 237                         guiroot = RenderingEngine::get_gui_env()->addStaticText(
 238                                         L"", core::rect<s32>(0, 0, 10000, 10000));
 239
 240                         bool game_has_run = launch_game(error_message,
 241                                         reconnect_requested, start_data, cmd_args);
 242
 243                         // Reset the reconnect_requested flag
 244                         reconnect_requested = false;
 245
 246                         // If skip_main_menu, we only want to startup once
 247                         if (skip_main_menu && !first_loop)
 248                                 break;
 249
 250                         first_loop = false;
 251
 252                         if (!game_has_run) {
 253                                 if (skip_main_menu)
 254                                         break;
 255
 256                                 continue;
 257                         }
 258
 259                         // Break out of menu-game loop to shut down cleanly
 260                         if (!RenderingEngine::get_raw_device()->run() || *kill) {
 261                                 if (!g_settings_path.empty())
 262                                         g_settings->updateConfigFile(
 263                                                         g_settings_path.c_str());
 264                                 break;
 265                         }
 266
 267                         RenderingEngine::get_video_driver()->setTextureCreationFlag(
 268                                         video::ETCF_CREATE_MIP_MAPS,
 269                                         g_settings->getBool("mip_map"));
 270
 271 #ifdef HAVE_TOUCHSCREENGUI
 272                         receiver->m_touchscreengui = new TouchScreenGUI(
 273                                         RenderingEngine::get_raw_device(), receiver);
 274                         g_touchscreengui = receiver->m_touchscreengui;
 275 #endif
 276
 277                         the_game(kill, input, start_data, error_message, chat_backend,
 278                                         &reconnect_requested);
 279                         RenderingEngine::get_scene_manager()->clear();
 280
 281 #ifdef HAVE_TOUCHSCREENGUI
 282                         delete g_touchscreengui;
 283                         g_touchscreengui = NULL;
 284                         receiver->m_touchscreengui = NULL;
 285 #endif
 286
 287                 } // try
 288                 catch (con::PeerNotFoundException &e) {
 289                         error_message = gettext("Connection error (timed out?)");
 290                         errorstream << error_message << std::endl;
 291                 }
 292
 293 #ifdef NDEBUG
 294                 catch (std::exception &e) {
 295                         std::string error_message = "Some exception: \"";
 296                         error_message += e.what();
 297                         error_message += "\"";
 298                         errorstream << error_message << std::endl;
 299                 }
 300 #endif
 301
 302                 // If no main menu, show error and exit
 303                 if (skip_main_menu) {
 304                         if (!error_message.empty()) {
 305                                 verbosestream << "error_message = " << error_message
 306                                               << std::endl;
 307                                 retval = false;
 308                         }
 309                         break;
 310                 }
 311         } // Menu-game loop
 312
 313         g_menuclouds->drop();
 314         g_menucloudsmgr->drop();
 315
 316         return retval;
 317 }
 318
 319 void ClientLauncher::init_args(GameStartData &start_data, const Settings &cmd_args)
 320 {
 321         skip_main_menu = cmd_args.getFlag("go");
 322
 323         start_data.address = g_settings->get("address");
 324         if (cmd_args.exists("address")) {
 325                 // Join a remote server
 326                 start_data.address = cmd_args.get("address");
 327                 start_data.world_path.clear();
 328         }
 329         if (!start_data.world_path.empty()) {
 330                 // Start a singleplayer instance
 331                 start_data.address = "";
 332         }
 333
 334         start_data.name = g_settings->get("name");
 335         if (cmd_args.exists("name"))
 336                 start_data.name = cmd_args.get("name");
 337
 338         list_video_modes = cmd_args.getFlag("videomodes");
 339
 340         random_input = g_settings->getBool("random_input") ||
 341                        cmd_args.getFlag("random-input");
 342 }
 343
 344 bool ClientLauncher::init_engine()
 345 {
 346         receiver = new MyEventReceiver();
 347         new RenderingEngine(receiver);
 348         return RenderingEngine::get_raw_device() != nullptr;
 349 }
 350
 351 void ClientLauncher::init_input()
 352 {
 353         if (random_input)
 354                 input = new RandomInputHandler();
 355         else
 356                 input = new RealInputHandler(receiver);
 357
 358         if (g_settings->getBool("enable_joysticks")) {
 359                 irr::core::array<irr::SJoystickInfo> infos;
 360                 std::vector<irr::SJoystickInfo> joystick_infos;
 361
 362                 // Make sure this is called maximum once per
 363                 // irrlicht device, otherwise it will give you
 364                 // multiple events for the same joystick.
 365                 if (RenderingEngine::get_raw_device()->activateJoysticks(infos)) {
 366                         infostream << "Joystick support enabled" << std::endl;
 367                         joystick_infos.reserve(infos.size());
 368                         for (u32 i = 0; i < infos.size(); i++) {
 369                                 joystick_infos.push_back(infos[i]);
 370                         }
 371                         input->joystick.onJoystickConnect(joystick_infos);
 372                 } else {
 373                         errorstream << "Could not activate joystick support."
 374                                     << std::endl;
 375                 }
 376         }
 377 }
 378
 379 bool ClientLauncher::launch_game(std::string &error_message, bool reconnect_requested,
 380                 GameStartData &start_data, const Settings &cmd_args)
 381 {
 382         // Prepare and check the start data to launch a game
 383         std::string error_message_lua = error_message;
 384         error_message.clear();
 385
 386         if (cmd_args.exists("password"))
 387                 start_data.password = cmd_args.get("password");
 388
 389         if (cmd_args.exists("password-file")) {
 390                 std::ifstream passfile(cmd_args.get("password-file"));
 391                 if (passfile.good()) {
 392                         getline(passfile, start_data.password);
 393                 } else {
 394                         error_message = gettext("Provided password file "
 395                                                 "failed to open: ") +
 396                                         cmd_args.get("password-file");
 397                         errorstream << error_message << std::endl;
 398                         return false;
 399                 }
 400         }
 401
 402         // If a world was commanded, append and select it
 403         // This is provieded by "get_world_from_cmdline()", main.cpp
 404         if (!start_data.world_path.empty()) {
 405                 auto &spec = start_data.world_spec;
 406
 407                 spec.path = start_data.world_path;
 408                 spec.gameid = getWorldGameId(spec.path, true);
 409                 spec.name = _("[--world parameter]");
 410
 411                 if (spec.gameid.empty()) { // Create new
 412                         spec.gameid = g_settings->get("default_game");
 413                         spec.name += " [new]";
 414                 }
 415         }
 416
 417         /* Show the GUI menu
 418          */
 419         std::string server_name, server_description;
 420         start_data.local_server = false;
 421         if (!skip_main_menu) {
 422                 // Initialize menu data
 423                 // TODO: Re-use existing structs (GameStartData)
 424                 MainMenuData menudata;
 425                 menudata.address = start_data.address;
 426                 menudata.name = start_data.name;
 427                 menudata.password = start_data.password;
 428                 menudata.port = itos(start_data.socket_port);
 429                 menudata.script_data.errormessage = error_message_lua;
 430                 menudata.script_data.reconnect_requested = reconnect_requested;
 431
 432                 main_menu(&menudata);
 433
 434                 // Skip further loading if there was an exit signal.
 435                 if (*porting::signal_handler_killstatus())
 436                         return false;
 437
 438                 if (!menudata.script_data.errormessage.empty()) {
 439                         /* The calling function will pass this back into this function
 440                          * upon the next iteration (if any) causing it to be displayed by
 441                          * the GUI
 442                          */
 443                         error_message = menudata.script_data.errormessage;
 444                         return false;
 445                 }
 446
 447                 int newport = stoi(menudata.port);
 448                 if (newport != 0)
 449                         start_data.socket_port = newport;
 450
 451                 // Update world information using main menu data
 452                 std::vector<WorldSpec> worldspecs = getAvailableWorlds();
 453
 454                 int world_index = menudata.selected_world;
 455                 if (world_index >= 0 && world_index < (int)worldspecs.size()) {
 456                         g_settings->set("selected_world_path",
 457                                         worldspecs[world_index].path);
 458                         start_data.world_spec = worldspecs[world_index];
 459                 }
 460
 461                 start_data.name = menudata.name;
 462                 start_data.password = menudata.password;
 463                 start_data.address = std::move(menudata.address);
 464                 server_name = menudata.servername;
 465                 server_description = menudata.serverdescription;
 466
 467                 start_data.local_server = !menudata.simple_singleplayer_mode &&
 468                                           start_data.address.empty();
 469         }
 470
 471         if (!RenderingEngine::run())
 472                 return false;
 473
 474         if (!start_data.isSinglePlayer() && start_data.name.empty()) {
 475                 error_message = gettext("Please choose a name!");
 476                 errorstream << error_message << std::endl;
 477                 return false;
 478         }
 479
 480         // If using simple singleplayer mode, override
 481         if (start_data.isSinglePlayer()) {
 482                 start_data.name = "singleplayer";
 483                 start_data.password = "";
 484                 start_data.socket_port = myrand_range(49152, 65535);
 485         } else {
 486                 g_settings->set("name", start_data.name);
 487                 if (!start_data.address.empty()) {
 488                         ServerListSpec server;
 489                         server["name"] = server_name;
 490                         server["address"] = start_data.address;
 491                         server["port"] = itos(start_data.socket_port);
 492                         server["description"] = server_description;
 493                         ServerList::insert(server);
 494                 }
 495         }
 496
 497         if (start_data.name.length() > PLAYERNAME_SIZE - 1) {
 498                 error_message = gettext("Player name too long.");
 499                 start_data.name.resize(PLAYERNAME_SIZE);
 500                 g_settings->set("name", start_data.name);
 501                 return false;
 502         }
 503
 504         auto &worldspec = start_data.world_spec;
 505         infostream << "Selected world: " << worldspec.name << " [" << worldspec.path
 506                    << "]" << std::endl;
 507
 508         if (start_data.address.empty()) {
 509                 // For singleplayer and local server
 510                 if (worldspec.path.empty()) {
 511                         error_message = gettext("No world selected and no address "
 512                                                 "provided. Nothing to do.");
 513                         errorstream << error_message << std::endl;
 514                         return false;
 515                 }
 516
 517                 if (!fs::PathExists(worldspec.path)) {
 518                         error_message = gettext("Provided world path doesn't exist: ") +
 519                                         worldspec.path;
 520                         errorstream << error_message << std::endl;
 521                         return false;
 522                 }
 523
 524                 // Load gamespec for required game
 525                 start_data.game_spec = findWorldSubgame(worldspec.path);
 526                 if (!start_data.game_spec.isValid()) {
 527                         error_message = gettext("Could not find or load game \"") +
 528                                         worldspec.gameid + "\"";
 529                         errorstream << error_message << std::endl;
 530                         return false;
 531                 }
 532
 533                 if (porting::signal_handler_killstatus())
 534                         return true;
 535
 536                 if (!start_data.game_spec.isValid()) {
 537                         error_message = gettext("Invalid gamespec.");
 538                         error_message += " (world.gameid=" + worldspec.gameid + ")";
 539                         errorstream << error_message << std::endl;
 540                         return false;
 541                 }
 542         }
 543
 544         start_data.world_path = start_data.world_spec.path;
 545         return true;
 546 }
 547
 548 void ClientLauncher::main_menu(MainMenuData *menudata)
 549 {
 550         bool *kill = porting::signal_handler_killstatus();
 551         video::IVideoDriver *driver = RenderingEngine::get_video_driver();
 552
 553         infostream << "Waiting for other menus" << std::endl;
 554         while (RenderingEngine::get_raw_device()->run() && !*kill) {
 555                 if (!isMenuActive())
 556                         break;
 557                 driver->beginScene(true, true, video::SColor(255, 128, 128, 128));
 558                 RenderingEngine::get_gui_env()->drawAll();
 559                 driver->endScene();
 560                 // On some computers framerate doesn't seem to be automatically limited
 561                 sleep_ms(25);
 562         }
 563         infostream << "Waited for other menus" << std::endl;
 564
 565         // Cursor can be non-visible when coming from the game
 566 #ifndef ANDROID
 567         RenderingEngine::get_raw_device()->getCursorControl()->setVisible(true);
 568 #endif
 569
 570         /* show main menu */
 571         GUIEngine mymenu(&input->joystick, guiroot, &g_menumgr, menudata, *kill);
 572
 573         /* leave scene manager in a clean state */
 574         RenderingEngine::get_scene_manager()->clear();
 575 }
 576
 577 void ClientLauncher::speed_tests()
 578 {
 579         // volatile to avoid some potential compiler optimisations
 580         volatile static s16 temp16;
 581         volatile static f32 tempf;
 582         static v3f tempv3f1;
 583         static v3f tempv3f2;
 584         static std::string tempstring;
 585         static std::string tempstring2;
 586
 587         tempv3f1 = v3f();
 588         tempv3f2 = v3f();
 589         tempstring.clear();
 590         tempstring2.clear();
 591
 592         {
 593                 infostream << "The following test should take around 20ms." << std::endl;
 594                 TimeTaker timer("Testing std::string speed");
 595                 const u32 jj = 10000;
 596                 for (u32 j = 0; j < jj; j++) {
 597                         tempstring = "";
 598                         tempstring2 = "";
 599                         const u32 ii = 10;
 600                         for (u32 i = 0; i < ii; i++) {
 601                                 tempstring2 += "asd";
 602                         }
 603                         for (u32 i = 0; i < ii + 1; i++) {
 604                                 tempstring += "asd";
 605                                 if (tempstring == tempstring2)
 606                                         break;
 607                         }
 608                 }
 609         }
 610
 611         infostream << "All of the following tests should take around 100ms each."
 612                    << std::endl;
 613
 614         {
 615                 TimeTaker timer("Testing floating-point conversion speed");
 616                 tempf = 0.001;
 617                 for (u32 i = 0; i < 4000000; i++) {
 618                         temp16 += tempf;
 619                         tempf += 0.001;
 620                 }
 621         }
 622
 623         {
 624                 TimeTaker timer("Testing floating-point vector speed");
 625
 626                 tempv3f1 = v3f(1, 2, 3);
 627                 tempv3f2 = v3f(4, 5, 6);
 628                 for (u32 i = 0; i < 10000000; i++) {
 629                         tempf += tempv3f1.dotProduct(tempv3f2);
 630                         tempv3f2 += v3f(7, 8, 9);
 631                 }
 632         }
 633
 634         {
 635                 TimeTaker timer("Testing std::map speed");
 636
 637                 std::map<v2s16, f32> map1;
 638                 tempf = -324;
 639                 const s16 ii = 300;
 640                 for (s16 y = 0; y < ii; y++) {
 641                         for (s16 x = 0; x < ii; x++) {
 642                                 map1[v2s16(x, y)] = tempf;
 643                                 tempf += 1;
 644                         }
 645                 }
 646                 for (s16 y = ii - 1; y >= 0; y--) {
 647                         for (s16 x = 0; x < ii; x++) {
 648                                 tempf = map1[v2s16(x, y)];
 649                         }
 650                 }
 651         }
 652
 653         {
 654                 infostream << "Around 5000/ms should do well here." << std::endl;
 655                 TimeTaker timer("Testing mutex speed");
 656
 657                 std::mutex m;
 658                 u32 n = 0;
 659                 u32 i = 0;
 660                 do {
 661                         n += 10000;
 662                         for (; i < n; i++) {
 663                                 m.lock();
 664                                 m.unlock();
 665                         }
 666                 }
 667                 // Do at least 10ms
 668                 while (timer.getTimerTime() < 10);
 669
 670                 u32 dtime = timer.stop();
 671                 u32 per_ms = n / dtime;
 672                 infostream << "Done. " << dtime << "ms, " << per_ms << "/ms" << std::endl;
 673         }
 674 }