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