src/porting.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 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 /*
  21         Random portability stuff
  22
  23         See comments in porting.h
  24 */
  25
  26 #include "porting.h"
  27
  28 #if defined(__FreeBSD__)
  29         #include <sys/types.h>
  30         #include <sys/sysctl.h>
  31 #elif defined(_WIN32)
  32         #include <algorithm>
  33 #endif
  34 #if !defined(_WIN32)
  35         #include <unistd.h>
  36         #include <sys/utsname.h>
  37 #endif
  38 #if defined(__hpux)
  39         #define _PSTAT64
  40         #include <sys/pstat.h>
  41 #endif
  42 #if !defined(_WIN32) && !defined(__APPLE__) && \
  43         !defined(__ANDROID__) && !defined(SERVER)
  44         #define XORG_USED
  45 #endif
  46 #ifdef XORG_USED
  47         #include <X11/Xlib.h>
  48         #include <X11/Xutil.h>
  49 #endif
  50
  51 #include "config.h"
  52 #include "debug.h"
  53 #include "filesys.h"
  54 #include "log.h"
  55 #include "util/string.h"
  56 #include "settings.h"
  57 #include <list>
  58
  59 namespace porting
  60 {
  61
  62 /*
  63         Signal handler (grabs Ctrl-C on POSIX systems)
  64 */
  65
  66 bool g_killed = false;
  67
  68 bool * signal_handler_killstatus(void)
  69 {
  70         return &g_killed;
  71 }
  72
  73 #if !defined(_WIN32) // POSIX
  74         #include <signal.h>
  75
  76 void sigint_handler(int sig)
  77 {
  78         if(g_killed == false)
  79         {
  80                 dstream<<DTIME<<"INFO: sigint_handler(): "
  81                                 <<"Ctrl-C pressed, shutting down."<<std::endl;
  82
  83                 // Comment out for less clutter when testing scripts
  84                 /*dstream<<DTIME<<"INFO: sigint_handler(): "
  85                                 <<"Printing debug stacks"<<std::endl;
  86                 debug_stacks_print();*/
  87
  88                 g_killed = true;
  89         }
  90         else
  91         {
  92                 (void)signal(SIGINT, SIG_DFL);
  93         }
  94 }
  95
  96 void signal_handler_init(void)
  97 {
  98         (void)signal(SIGINT, sigint_handler);
  99 }
 100
 101 #else // _WIN32
 102         #include <signal.h>
 103
 104 BOOL WINAPI event_handler(DWORD sig)
 105 {
 106         switch (sig) {
 107         case CTRL_C_EVENT:
 108         case CTRL_CLOSE_EVENT:
 109         case CTRL_LOGOFF_EVENT:
 110         case CTRL_SHUTDOWN_EVENT:
 111                 if (g_killed == false) {
 112                         dstream << DTIME << "INFO: event_handler(): "
 113                                 << "Ctrl+C, Close Event, Logoff Event or Shutdown Event,"
 114                                 " shutting down." << std::endl;
 115                         g_killed = true;
 116                 } else {
 117                         (void)signal(SIGINT, SIG_DFL);
 118                 }
 119                 break;
 120         case CTRL_BREAK_EVENT:
 121                 break;
 122         }
 123
 124         return TRUE;
 125 }
 126
 127 void signal_handler_init(void)
 128 {
 129         SetConsoleCtrlHandler( (PHANDLER_ROUTINE)event_handler,TRUE);
 130 }
 131
 132 #endif
 133
 134
 135 /*
 136         Multithreading support
 137 */
 138 int getNumberOfProcessors()
 139 {
 140 #if defined(_SC_NPROCESSORS_ONLN)
 141
 142         return sysconf(_SC_NPROCESSORS_ONLN);
 143
 144 #elif defined(__FreeBSD__) || defined(__APPLE__)
 145
 146         unsigned int len, count;
 147         len = sizeof(count);
 148         return sysctlbyname("hw.ncpu", &count, &len, NULL, 0);
 149
 150 #elif defined(_GNU_SOURCE)
 151
 152         return get_nprocs();
 153
 154 #elif defined(_WIN32)
 155
 156         SYSTEM_INFO sysinfo;
 157         GetSystemInfo(&sysinfo);
 158         return sysinfo.dwNumberOfProcessors;
 159
 160 #elif defined(PTW32_VERSION) || defined(__hpux)
 161
 162         return pthread_num_processors_np();
 163
 164 #else
 165
 166         return 1;
 167
 168 #endif
 169 }
 170
 171
 172 #ifndef __ANDROID__
 173 bool threadBindToProcessor(threadid_t tid, int pnumber)
 174 {
 175 #if defined(_WIN32)
 176
 177         HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, 0, tid);
 178         if (!hThread)
 179                 return false;
 180
 181         bool success = SetThreadAffinityMask(hThread, 1 << pnumber) != 0;
 182
 183         CloseHandle(hThread);
 184         return success;
 185
 186 #elif (defined(__FreeBSD__) && (__FreeBSD_version >= 702106)) \
 187         || defined(__linux) || defined(linux)
 188
 189         cpu_set_t cpuset;
 190
 191         CPU_ZERO(&cpuset);
 192         CPU_SET(pnumber, &cpuset);
 193         return pthread_setaffinity_np(tid, sizeof(cpuset), &cpuset) == 0;
 194
 195 #elif defined(__sun) || defined(sun)
 196
 197         return processor_bind(P_LWPID, MAKE_LWPID_PTHREAD(tid),
 198                 pnumber, NULL) == 0;
 199
 200 #elif defined(_AIX)
 201
 202         return bindprocessor(BINDTHREAD, (tid_t)tid, pnumber) == 0;
 203
 204 #elif defined(__hpux) || defined(hpux)
 205
 206         pthread_spu_t answer;
 207
 208         return pthread_processor_bind_np(PTHREAD_BIND_ADVISORY_NP,
 209                 &answer, pnumber, tid) == 0;
 210
 211 #elif defined(__APPLE__)
 212
 213         struct thread_affinity_policy tapol;
 214
 215         thread_port_t threadport = pthread_mach_thread_np(tid);
 216         tapol.affinity_tag = pnumber + 1;
 217         return thread_policy_set(threadport, THREAD_AFFINITY_POLICY,
 218                 (thread_policy_t)&tapol, THREAD_AFFINITY_POLICY_COUNT) == KERN_SUCCESS;
 219
 220 #else
 221
 222         return false;
 223
 224 #endif
 225 }
 226 #endif
 227
 228 bool threadSetPriority(threadid_t tid, int prio)
 229 {
 230 #if defined(_WIN32)
 231
 232         HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, 0, tid);
 233         if (!hThread)
 234                 return false;
 235
 236         bool success = SetThreadPriority(hThread, prio) != 0;
 237
 238         CloseHandle(hThread);
 239         return success;
 240
 241 #else
 242
 243         struct sched_param sparam;
 244         int policy;
 245
 246         if (pthread_getschedparam(tid, &policy, &sparam) != 0)
 247                 return false;
 248
 249         int min = sched_get_priority_min(policy);
 250         int max = sched_get_priority_max(policy);
 251
 252         sparam.sched_priority = min + prio * (max - min) / THREAD_PRIORITY_HIGHEST;
 253         return pthread_setschedparam(tid, policy, &sparam) == 0;
 254
 255 #endif
 256 }
 257
 258
 259 /*
 260         Path mangler
 261 */
 262
 263 // Default to RUN_IN_PLACE style relative paths
 264 std::string path_share = "..";
 265 std::string path_user = "..";
 266
 267 std::string getDataPath(const char *subpath)
 268 {
 269         return path_share + DIR_DELIM + subpath;
 270 }
 271
 272 void pathRemoveFile(char *path, char delim)
 273 {
 274         // Remove filename and path delimiter
 275         int i;
 276         for(i = strlen(path)-1; i>=0; i--)
 277         {
 278                 if(path[i] == delim)
 279                         break;
 280         }
 281         path[i] = 0;
 282 }
 283
 284 bool detectMSVCBuildDir(const std::string &path)
 285 {
 286         const char *ends[] = {
 287                 "bin\\Release",
 288                 "bin\\Debug",
 289                 "bin\\Build",
 290                 NULL
 291         };
 292         return (removeStringEnd(path, ends) != "");
 293 }
 294
 295 std::string get_sysinfo()
 296 {
 297 #ifdef _WIN32
 298         OSVERSIONINFO osvi;
 299         std::ostringstream oss;
 300         std::string tmp;
 301         ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
 302         osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
 303         GetVersionEx(&osvi);
 304         tmp = osvi.szCSDVersion;
 305         std::replace(tmp.begin(), tmp.end(), ' ', '_');
 306
 307         oss << "Windows/" << osvi.dwMajorVersion << "."
 308                 << osvi.dwMinorVersion;
 309         if(osvi.szCSDVersion[0])
 310                 oss << "-" << tmp;
 311         oss << " ";
 312         #ifdef _WIN64
 313         oss << "x86_64";
 314         #else
 315         BOOL is64 = FALSE;
 316         if(IsWow64Process(GetCurrentProcess(), &is64) && is64)
 317                 oss << "x86_64"; // 32-bit app on 64-bit OS
 318         else
 319                 oss << "x86";
 320         #endif
 321
 322         return oss.str();
 323 #else
 324         struct utsname osinfo;
 325         uname(&osinfo);
 326         return std::string(osinfo.sysname) + "/"
 327                 + osinfo.release + " " + osinfo.machine;
 328 #endif
 329 }
 330
 331
 332 bool getCurrentWorkingDir(char *buf, size_t len)
 333 {
 334 #ifdef _WIN32
 335         DWORD ret = GetCurrentDirectory(len, buf);
 336         return (ret != 0) && (ret <= len);
 337 #else
 338         return getcwd(buf, len);
 339 #endif
 340 }
 341
 342
 343 bool getExecPathFromProcfs(char *buf, size_t buflen)
 344 {
 345 #ifndef _WIN32
 346         buflen--;
 347
 348         ssize_t len;
 349         if ((len = readlink("/proc/self/exe",     buf, buflen)) == -1 &&
 350                 (len = readlink("/proc/curproc/file", buf, buflen)) == -1 &&
 351                 (len = readlink("/proc/curproc/exe",  buf, buflen)) == -1)
 352                 return false;
 353
 354         buf[len] = '\0';
 355         return true;
 356 #else
 357         return false;
 358 #endif
 359 }
 360
 361 //// Windows
 362 #if defined(_WIN32)
 363
 364 bool getCurrentExecPath(char *buf, size_t len)
 365 {
 366         DWORD written = GetModuleFileNameA(NULL, buf, len);
 367         if (written == 0 || written == len)
 368                 return false;
 369
 370         return true;
 371 }
 372
 373
 374 //// Linux
 375 #elif defined(linux) || defined(__linux) || defined(__linux__)
 376
 377 bool getCurrentExecPath(char *buf, size_t len)
 378 {
 379         if (!getExecPathFromProcfs(buf, len))
 380                 return false;
 381
 382         return true;
 383 }
 384
 385
 386 //// Mac OS X, Darwin
 387 #elif defined(__APPLE__)
 388
 389 bool getCurrentExecPath(char *buf, size_t len)
 390 {
 391         uint32_t lenb = (uint32_t)len;
 392         if (_NSGetExecutablePath(buf, &lenb) == -1)
 393                 return false;
 394
 395         return true;
 396 }
 397
 398
 399 //// FreeBSD, NetBSD, DragonFlyBSD
 400 #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
 401
 402 bool getCurrentExecPath(char *buf, size_t len)
 403 {
 404         // Try getting path from procfs first, since valgrind
 405         // doesn't work with the latter
 406         if (getExecPathFromProcfs(buf, len))
 407                 return true;
 408
 409         int mib[4];
 410
 411         mib[0] = CTL_KERN;
 412         mib[1] = KERN_PROC;
 413         mib[2] = KERN_PROC_PATHNAME;
 414         mib[3] = -1;
 415
 416         if (sysctl(mib, 4, buf, &len, NULL, 0) == -1)
 417                 return false;
 418
 419         return true;
 420 }
 421
 422
 423 //// Solaris
 424 #elif defined(__sun) || defined(sun)
 425
 426 bool getCurrentExecPath(char *buf, size_t len)
 427 {
 428         const char *exec = getexecname();
 429         if (exec == NULL)
 430                 return false;
 431
 432         if (strlcpy(buf, exec, len) >= len)
 433                 return false;
 434
 435         return true;
 436 }
 437
 438
 439 // HP-UX
 440 #elif defined(__hpux)
 441
 442 bool getCurrentExecPath(char *buf, size_t len)
 443 {
 444         struct pst_status psts;
 445
 446         if (pstat_getproc(&psts, sizeof(psts), 0, getpid()) == -1)
 447                 return false;
 448
 449         if (pstat_getpathname(buf, len, &psts.pst_fid_text) == -1)
 450                 return false;
 451
 452         return true;
 453 }
 454
 455
 456 #else
 457
 458 bool getCurrentExecPath(char *buf, size_t len)
 459 {
 460         return false;
 461 }
 462
 463 #endif
 464
 465
 466 //// Windows
 467 #if defined(_WIN32)
 468
 469 bool setSystemPaths()
 470 {
 471         char buf[BUFSIZ];
 472
 473         // Find path of executable and set path_share relative to it
 474         FATAL_ERROR_IF(!getCurrentExecPath(buf, sizeof(buf)),
 475                 "Failed to get current executable path");
 476         pathRemoveFile(buf, '\\');
 477
 478         // Use ".\bin\.."
 479         path_share = std::string(buf) + "\\..";
 480
 481         // Use "C:\Documents and Settings\user\Application Data\<PROJECT_NAME>"
 482         DWORD len = GetEnvironmentVariable("APPDATA", buf, sizeof(buf));
 483         FATAL_ERROR_IF(len == 0 || len > sizeof(buf), "Failed to get APPDATA");
 484
 485         path_user = std::string(buf) + DIR_DELIM + lowercase(PROJECT_NAME);
 486         return true;
 487 }
 488
 489
 490 //// Linux
 491 #elif defined(linux) || defined(__linux)
 492
 493 bool setSystemPaths()
 494 {
 495         char buf[BUFSIZ];
 496
 497         if (!getCurrentExecPath(buf, sizeof(buf))) {
 498 #ifdef __ANDROID__
 499                 errorstream << "Unable to read bindir "<< std::endl;
 500 #else
 501                 FATAL_ERROR("Unable to read bindir");
 502 #endif
 503                 return false;
 504         }
 505
 506         pathRemoveFile(buf, '/');
 507         std::string bindir(buf);
 508
 509         // Find share directory from these.
 510         // It is identified by containing the subdirectory "builtin".
 511         std::list<std::string> trylist;
 512         std::string static_sharedir = STATIC_SHAREDIR;
 513         if (static_sharedir != "" && static_sharedir != ".")
 514                 trylist.push_back(static_sharedir);
 515
 516         trylist.push_back(bindir + DIR_DELIM ".." DIR_DELIM "share"
 517                 DIR_DELIM + lowercase(PROJECT_NAME));
 518         trylist.push_back(bindir + DIR_DELIM "..");
 519
 520 #ifdef __ANDROID__
 521         trylist.push_back(path_user);
 522 #endif
 523
 524         for (std::list<std::string>::const_iterator
 525                         i = trylist.begin(); i != trylist.end(); i++) {
 526                 const std::string &trypath = *i;
 527                 if (!fs::PathExists(trypath) ||
 528                         !fs::PathExists(trypath + DIR_DELIM + "builtin")) {
 529                         dstream << "WARNING: system-wide share not found at \""
 530                                         << trypath << "\""<< std::endl;
 531                         continue;
 532                 }
 533
 534                 // Warn if was not the first alternative
 535                 if (i != trylist.begin()) {
 536                         dstream << "WARNING: system-wide share found at \""
 537                                         << trypath << "\"" << std::endl;
 538                 }
 539
 540                 path_share = trypath;
 541                 break;
 542         }
 543
 544 #ifndef __ANDROID__
 545         path_user = std::string(getenv("HOME")) + DIR_DELIM "."
 546                 + lowercase(PROJECT_NAME);
 547 #endif
 548
 549         return true;
 550 }
 551
 552
 553 //// Mac OS X
 554 #elif defined(__APPLE__)
 555
 556 bool setSystemPaths()
 557 {
 558         CFBundleRef main_bundle = CFBundleGetMainBundle();
 559         CFURLRef resources_url = CFBundleCopyResourcesDirectoryURL(main_bundle);
 560         char path[PATH_MAX];
 561         if (CFURLGetFileSystemRepresentation(resources_url,
 562                         TRUE, (UInt8 *)path, PATH_MAX)) {
 563                 path_share = std::string(path);
 564         } else {
 565                 dstream << "WARNING: Could not determine bundle resource path" << std::endl;
 566         }
 567         CFRelease(resources_url);
 568
 569         path_user = std::string(getenv("HOME"))
 570                 + "/Library/Application Support/"
 571                 + lowercase(PROJECT_NAME);
 572         return true;
 573 }
 574
 575
 576 #else
 577
 578 bool setSystemPaths()
 579 {
 580         path_share = STATIC_SHAREDIR;
 581         path_user  = std::string(getenv("HOME")) + DIR_DELIM "."
 582                 + lowercase(PROJECT_NAME);
 583         return true;
 584 }
 585
 586
 587 #endif
 588
 589
 590 void initializePaths()
 591 {
 592 #if RUN_IN_PLACE
 593         char buf[BUFSIZ];
 594
 595         infostream << "Using relative paths (RUN_IN_PLACE)" << std::endl;
 596
 597         bool success =
 598                 getCurrentExecPath(buf, sizeof(buf)) ||
 599                 getExecPathFromProcfs(buf, sizeof(buf));
 600
 601         if (success) {
 602                 pathRemoveFile(buf, '/');
 603                 std::string execpath(buf);
 604
 605                 path_share = execpath + DIR_DELIM "..";
 606                 path_user  = execpath + DIR_DELIM "..";
 607
 608                 if (detectMSVCBuildDir(execpath)) {
 609                         path_share += DIR_DELIM "..";
 610                         path_user  += DIR_DELIM "..";
 611                 }
 612         } else {
 613                 errorstream << "Failed to get paths by executable location, "
 614                         "trying cwd" << std::endl;
 615
 616                 if (!getCurrentWorkingDir(buf, sizeof(buf)))
 617                         FATAL_ERROR("Ran out of methods to get paths");
 618
 619                 size_t cwdlen = strlen(buf);
 620                 if (cwdlen >= 1 && buf[cwdlen - 1] == DIR_DELIM_CHAR) {
 621                         cwdlen--;
 622                         buf[cwdlen] = '\0';
 623                 }
 624
 625                 if (cwdlen >= 4 && !strcmp(buf + cwdlen - 4, DIR_DELIM "bin"))
 626                         pathRemoveFile(buf, DIR_DELIM_CHAR);
 627
 628                 std::string execpath(buf);
 629
 630                 path_share = execpath;
 631                 path_user  = execpath;
 632         }
 633
 634 #else
 635         infostream << "Using system-wide paths (NOT RUN_IN_PLACE)" << std::endl;
 636
 637         if (!setSystemPaths())
 638                 errorstream << "Failed to get one or more system-wide path" << std::endl;
 639
 640 #endif
 641
 642         infostream << "Detected share path: " << path_share << std::endl;
 643         infostream << "Detected user path: " << path_user << std::endl;
 644 }
 645
 646
 647
 648 void setXorgClassHint(const video::SExposedVideoData &video_data,
 649         const std::string &name)
 650 {
 651 #ifdef XORG_USED
 652         if (video_data.OpenGLLinux.X11Display == NULL)
 653                 return;
 654
 655         XClassHint *classhint = XAllocClassHint();
 656         classhint->res_name  = (char *)name.c_str();
 657         classhint->res_class = (char *)name.c_str();
 658
 659         XSetClassHint((Display *)video_data.OpenGLLinux.X11Display,
 660                 video_data.OpenGLLinux.X11Window, classhint);
 661         XFree(classhint);
 662 #endif
 663 }
 664
 665
 666 ////
 667 //// Video/Display Information (Client-only)
 668 ////
 669
 670 #ifndef SERVER
 671
 672 static irr::IrrlichtDevice *device;
 673
 674 void initIrrlicht(irr::IrrlichtDevice *device_)
 675 {
 676         device = device_;
 677 }
 678
 679 v2u32 getWindowSize()
 680 {
 681         return device->getVideoDriver()->getScreenSize();
 682 }
 683
 684
 685 std::vector<core::vector3d<u32> > getSupportedVideoModes()
 686 {
 687         IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
 688         sanity_check(nulldevice != NULL);
 689
 690         std::vector<core::vector3d<u32> > mlist;
 691         video::IVideoModeList *modelist = nulldevice->getVideoModeList();
 692
 693         u32 num_modes = modelist->getVideoModeCount();
 694         for (u32 i = 0; i != num_modes; i++) {
 695                 core::dimension2d<u32> mode_res = modelist->getVideoModeResolution(i);
 696                 s32 mode_depth = modelist->getVideoModeDepth(i);
 697                 mlist.push_back(core::vector3d<u32>(mode_res.Width, mode_res.Height, mode_depth));
 698         }
 699
 700         nulldevice->drop();
 701
 702         return mlist;
 703 }
 704
 705 std::vector<irr::video::E_DRIVER_TYPE> getSupportedVideoDrivers()
 706 {
 707         std::vector<irr::video::E_DRIVER_TYPE> drivers;
 708
 709         for (int i = 0; i != irr::video::EDT_COUNT; i++) {
 710                 if (irr::IrrlichtDevice::isDriverSupported((irr::video::E_DRIVER_TYPE)i))
 711                         drivers.push_back((irr::video::E_DRIVER_TYPE)i);
 712         }
 713
 714         return drivers;
 715 }
 716
 717 const char *getVideoDriverName(irr::video::E_DRIVER_TYPE type)
 718 {
 719         static const char *driver_ids[] = {
 720                 "null",
 721                 "software",
 722                 "burningsvideo",
 723                 "direct3d8",
 724                 "direct3d9",
 725                 "opengl",
 726                 "ogles1",
 727                 "ogles2",
 728         };
 729
 730         return driver_ids[type];
 731 }
 732
 733
 734 const char *getVideoDriverFriendlyName(irr::video::E_DRIVER_TYPE type)
 735 {
 736         static const char *driver_names[] = {
 737                 "NULL Driver",
 738                 "Software Renderer",
 739                 "Burning's Video",
 740                 "Direct3D 8",
 741                 "Direct3D 9",
 742                 "OpenGL",
 743                 "OpenGL ES1",
 744                 "OpenGL ES2",
 745         };
 746
 747         return driver_names[type];
 748 }
 749
 750 #       ifndef __ANDROID__
 751 #               ifdef XORG_USED
 752
 753 static float calcDisplayDensity()
 754 {
 755         const char* current_display = getenv("DISPLAY");
 756
 757         if (current_display != NULL) {
 758                         Display * x11display = XOpenDisplay(current_display);
 759
 760                         if (x11display != NULL) {
 761                                 /* try x direct */
 762                                 float dpi_height =
 763                                                 floor(DisplayHeight(x11display, 0) /
 764                                                                 (DisplayHeightMM(x11display, 0) * 0.039370) + 0.5);
 765                                 float dpi_width =
 766                                                 floor(DisplayWidth(x11display, 0) /
 767                                                                 (DisplayWidthMM(x11display, 0) * 0.039370) +0.5);
 768
 769                                 XCloseDisplay(x11display);
 770
 771                                 return std::max(dpi_height,dpi_width) / 96.0;
 772                         }
 773                 }
 774
 775         /* return manually specified dpi */
 776         return g_settings->getFloat("screen_dpi")/96.0;
 777 }
 778
 779
 780 float getDisplayDensity()
 781 {
 782         static float cached_display_density = calcDisplayDensity();
 783         return cached_display_density;
 784 }
 785
 786
 787 #               else // XORG_USED
 788 float getDisplayDensity()
 789 {
 790         return g_settings->getFloat("screen_dpi")/96.0;
 791 }
 792 #               endif // XORG_USED
 793
 794 v2u32 getDisplaySize()
 795 {
 796         IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
 797
 798         core::dimension2d<u32> deskres = nulldevice->getVideoModeList()->getDesktopResolution();
 799         nulldevice -> drop();
 800
 801         return deskres;
 802 }
 803 #       endif // __ANDROID__
 804 #endif // SERVER
 805
 806 } //namespace porting
 807