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 <windows.h>
  33         #include <wincrypt.h>
  34         #include <algorithm>
  35 #endif
  36 #if !defined(_WIN32)
  37         #include <unistd.h>
  38         #include <sys/utsname.h>
  39 #endif
  40 #if defined(__hpux)
  41         #define _PSTAT64
  42         #include <sys/pstat.h>
  43 #endif
  44 #if !defined(_WIN32) && !defined(__APPLE__) && \
  45         !defined(__ANDROID__) && !defined(SERVER)
  46         #define XORG_USED
  47 #endif
  48 #ifdef XORG_USED
  49         #include <X11/Xlib.h>
  50         #include <X11/Xutil.h>
  51 #endif
  52
  53 #include "config.h"
  54 #include "debug.h"
  55 #include "filesys.h"
  56 #include "log.h"
  57 #include "util/string.h"
  58 #include "settings.h"
  59 #include <list>
  60
  61 namespace porting
  62 {
  63
  64 /*
  65         Signal handler (grabs Ctrl-C on POSIX systems)
  66 */
  67
  68 bool g_killed = false;
  69
  70 bool * signal_handler_killstatus(void)
  71 {
  72         return &g_killed;
  73 }
  74
  75 #if !defined(_WIN32) // POSIX
  76         #include <signal.h>
  77
  78 void signal_handler(int sig)
  79 {
  80         if (!g_killed) {
  81                 if (sig == SIGINT) {
  82                         dstream << "INFO: signal_handler(): "
  83                                 << "Ctrl-C pressed, shutting down." << std::endl;
  84                 } else if (sig == SIGTERM) {
  85                         dstream << "INFO: signal_handler(): "
  86                                 << "got SIGTERM, shutting down." << std::endl;
  87                 }
  88
  89                 // Comment out for less clutter when testing scripts
  90                 /*dstream << "INFO: sigint_handler(): "
  91                                 << "Printing debug stacks" << std::endl;
  92                 debug_stacks_print();*/
  93
  94                 g_killed = true;
  95         } else {
  96                 (void)signal(sig, SIG_DFL);
  97         }
  98 }
  99
 100 void signal_handler_init(void)
 101 {
 102         (void)signal(SIGINT, signal_handler);
 103         (void)signal(SIGTERM, signal_handler);
 104 }
 105
 106 #else // _WIN32
 107         #include <signal.h>
 108
 109 BOOL WINAPI event_handler(DWORD sig)
 110 {
 111         switch (sig) {
 112         case CTRL_C_EVENT:
 113         case CTRL_CLOSE_EVENT:
 114         case CTRL_LOGOFF_EVENT:
 115         case CTRL_SHUTDOWN_EVENT:
 116                 if (!g_killed) {
 117                         dstream << "INFO: event_handler(): "
 118                                 << "Ctrl+C, Close Event, Logoff Event or Shutdown Event,"
 119                                 " shutting down." << std::endl;
 120                         g_killed = true;
 121                 } else {
 122                         (void)signal(SIGINT, SIG_DFL);
 123                 }
 124                 break;
 125         case CTRL_BREAK_EVENT:
 126                 break;
 127         }
 128
 129         return TRUE;
 130 }
 131
 132 void signal_handler_init(void)
 133 {
 134         SetConsoleCtrlHandler((PHANDLER_ROUTINE)event_handler, TRUE);
 135 }
 136
 137 #endif
 138
 139
 140 /*
 141         Path mangler
 142 */
 143
 144 // Default to RUN_IN_PLACE style relative paths
 145 std::string path_share = "..";
 146 std::string path_user = "..";
 147 std::string path_locale = path_share + DIR_DELIM + "locale";
 148 std::string path_cache = path_user + DIR_DELIM + "cache";
 149
 150
 151 std::string getDataPath(const char *subpath)
 152 {
 153         return path_share + DIR_DELIM + subpath;
 154 }
 155
 156 void pathRemoveFile(char *path, char delim)
 157 {
 158         // Remove filename and path delimiter
 159         int i;
 160         for(i = strlen(path)-1; i>=0; i--)
 161         {
 162                 if(path[i] == delim)
 163                         break;
 164         }
 165         path[i] = 0;
 166 }
 167
 168 bool detectMSVCBuildDir(const std::string &path)
 169 {
 170         const char *ends[] = {
 171                 "bin\\Release",
 172                 "bin\\MinSizeRel",
 173                 "bin\\RelWithDebInfo",
 174                 "bin\\Debug",
 175                 "bin\\Build",
 176                 NULL
 177         };
 178         return (removeStringEnd(path, ends) != "");
 179 }
 180
 181 std::string get_sysinfo()
 182 {
 183 #ifdef _WIN32
 184         OSVERSIONINFO osvi;
 185         std::ostringstream oss;
 186         std::string tmp;
 187         ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
 188         osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
 189         GetVersionEx(&osvi);
 190         tmp = osvi.szCSDVersion;
 191         std::replace(tmp.begin(), tmp.end(), ' ', '_');
 192
 193         oss << "Windows/" << osvi.dwMajorVersion << "."
 194                 << osvi.dwMinorVersion;
 195         if (osvi.szCSDVersion[0])
 196                 oss << "-" << tmp;
 197         oss << " ";
 198         #ifdef _WIN64
 199         oss << "x86_64";
 200         #else
 201         BOOL is64 = FALSE;
 202         if (IsWow64Process(GetCurrentProcess(), &is64) && is64)
 203                 oss << "x86_64"; // 32-bit app on 64-bit OS
 204         else
 205                 oss << "x86";
 206         #endif
 207
 208         return oss.str();
 209 #else
 210         struct utsname osinfo;
 211         uname(&osinfo);
 212         return std::string(osinfo.sysname) + "/"
 213                 + osinfo.release + " " + osinfo.machine;
 214 #endif
 215 }
 216
 217
 218 bool getCurrentWorkingDir(char *buf, size_t len)
 219 {
 220 #ifdef _WIN32
 221         DWORD ret = GetCurrentDirectory(len, buf);
 222         return (ret != 0) && (ret <= len);
 223 #else
 224         return getcwd(buf, len);
 225 #endif
 226 }
 227
 228
 229 bool getExecPathFromProcfs(char *buf, size_t buflen)
 230 {
 231 #ifndef _WIN32
 232         buflen--;
 233
 234         ssize_t len;
 235         if ((len = readlink("/proc/self/exe",     buf, buflen)) == -1 &&
 236                 (len = readlink("/proc/curproc/file", buf, buflen)) == -1 &&
 237                 (len = readlink("/proc/curproc/exe",  buf, buflen)) == -1)
 238                 return false;
 239
 240         buf[len] = '\0';
 241         return true;
 242 #else
 243         return false;
 244 #endif
 245 }
 246
 247 //// Windows
 248 #if defined(_WIN32)
 249
 250 bool getCurrentExecPath(char *buf, size_t len)
 251 {
 252         DWORD written = GetModuleFileNameA(NULL, buf, len);
 253         if (written == 0 || written == len)
 254                 return false;
 255
 256         return true;
 257 }
 258
 259
 260 //// Linux
 261 #elif defined(__linux__)
 262
 263 bool getCurrentExecPath(char *buf, size_t len)
 264 {
 265         if (!getExecPathFromProcfs(buf, len))
 266                 return false;
 267
 268         return true;
 269 }
 270
 271
 272 //// Mac OS X, Darwin
 273 #elif defined(__APPLE__)
 274
 275 bool getCurrentExecPath(char *buf, size_t len)
 276 {
 277         uint32_t lenb = (uint32_t)len;
 278         if (_NSGetExecutablePath(buf, &lenb) == -1)
 279                 return false;
 280
 281         return true;
 282 }
 283
 284
 285 //// FreeBSD, NetBSD, DragonFlyBSD
 286 #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
 287
 288 bool getCurrentExecPath(char *buf, size_t len)
 289 {
 290         // Try getting path from procfs first, since valgrind
 291         // doesn't work with the latter
 292         if (getExecPathFromProcfs(buf, len))
 293                 return true;
 294
 295         int mib[4];
 296
 297         mib[0] = CTL_KERN;
 298         mib[1] = KERN_PROC;
 299         mib[2] = KERN_PROC_PATHNAME;
 300         mib[3] = -1;
 301
 302         if (sysctl(mib, 4, buf, &len, NULL, 0) == -1)
 303                 return false;
 304
 305         return true;
 306 }
 307
 308
 309 //// Solaris
 310 #elif defined(__sun) || defined(sun)
 311
 312 bool getCurrentExecPath(char *buf, size_t len)
 313 {
 314         const char *exec = getexecname();
 315         if (exec == NULL)
 316                 return false;
 317
 318         if (strlcpy(buf, exec, len) >= len)
 319                 return false;
 320
 321         return true;
 322 }
 323
 324
 325 // HP-UX
 326 #elif defined(__hpux)
 327
 328 bool getCurrentExecPath(char *buf, size_t len)
 329 {
 330         struct pst_status psts;
 331
 332         if (pstat_getproc(&psts, sizeof(psts), 0, getpid()) == -1)
 333                 return false;
 334
 335         if (pstat_getpathname(buf, len, &psts.pst_fid_text) == -1)
 336                 return false;
 337
 338         return true;
 339 }
 340
 341
 342 #else
 343
 344 bool getCurrentExecPath(char *buf, size_t len)
 345 {
 346         return false;
 347 }
 348
 349 #endif
 350
 351
 352 //// Windows
 353 #if defined(_WIN32)
 354
 355 bool setSystemPaths()
 356 {
 357         char buf[BUFSIZ];
 358
 359         // Find path of executable and set path_share relative to it
 360         FATAL_ERROR_IF(!getCurrentExecPath(buf, sizeof(buf)),
 361                 "Failed to get current executable path");
 362         pathRemoveFile(buf, '\\');
 363
 364         // Use ".\bin\.."
 365         path_share = std::string(buf) + "\\..";
 366
 367         // Use "C:\Documents and Settings\user\Application Data\<PROJECT_NAME>"
 368         DWORD len = GetEnvironmentVariable("APPDATA", buf, sizeof(buf));
 369         FATAL_ERROR_IF(len == 0 || len > sizeof(buf), "Failed to get APPDATA");
 370
 371         path_user = std::string(buf) + DIR_DELIM + PROJECT_NAME;
 372         return true;
 373 }
 374
 375
 376 //// Linux
 377 #elif defined(__linux__)
 378
 379 bool setSystemPaths()
 380 {
 381         char buf[BUFSIZ];
 382
 383         if (!getCurrentExecPath(buf, sizeof(buf))) {
 384 #ifdef __ANDROID__
 385                 errorstream << "Unable to read bindir "<< std::endl;
 386 #else
 387                 FATAL_ERROR("Unable to read bindir");
 388 #endif
 389                 return false;
 390         }
 391
 392         pathRemoveFile(buf, '/');
 393         std::string bindir(buf);
 394
 395         // Find share directory from these.
 396         // It is identified by containing the subdirectory "builtin".
 397         std::list<std::string> trylist;
 398         std::string static_sharedir = STATIC_SHAREDIR;
 399         if (static_sharedir != "" && static_sharedir != ".")
 400                 trylist.push_back(static_sharedir);
 401
 402         trylist.push_back(bindir + DIR_DELIM ".." DIR_DELIM "share"
 403                 DIR_DELIM + PROJECT_NAME);
 404         trylist.push_back(bindir + DIR_DELIM "..");
 405
 406 #ifdef __ANDROID__
 407         trylist.push_back(path_user);
 408 #endif
 409
 410         for (std::list<std::string>::const_iterator
 411                         i = trylist.begin(); i != trylist.end(); i++) {
 412                 const std::string &trypath = *i;
 413                 if (!fs::PathExists(trypath) ||
 414                         !fs::PathExists(trypath + DIR_DELIM + "builtin")) {
 415                         warningstream << "system-wide share not found at \""
 416                                         << trypath << "\""<< std::endl;
 417                         continue;
 418                 }
 419
 420                 // Warn if was not the first alternative
 421                 if (i != trylist.begin()) {
 422                         warningstream << "system-wide share found at \""
 423                                         << trypath << "\"" << std::endl;
 424                 }
 425
 426                 path_share = trypath;
 427                 break;
 428         }
 429
 430 #ifndef __ANDROID__
 431         path_user = std::string(getenv("HOME")) + DIR_DELIM "."
 432                 + PROJECT_NAME;
 433 #endif
 434
 435         return true;
 436 }
 437
 438
 439 //// Mac OS X
 440 #elif defined(__APPLE__)
 441
 442 bool setSystemPaths()
 443 {
 444         CFBundleRef main_bundle = CFBundleGetMainBundle();
 445         CFURLRef resources_url = CFBundleCopyResourcesDirectoryURL(main_bundle);
 446         char path[PATH_MAX];
 447         if (CFURLGetFileSystemRepresentation(resources_url,
 448                         TRUE, (UInt8 *)path, PATH_MAX)) {
 449                 path_share = std::string(path);
 450         } else {
 451                 warningstream << "Could not determine bundle resource path" << std::endl;
 452         }
 453         CFRelease(resources_url);
 454
 455         path_user = std::string(getenv("HOME"))
 456                 + "/Library/Application Support/"
 457                 + PROJECT_NAME;
 458         return true;
 459 }
 460
 461
 462 #else
 463
 464 bool setSystemPaths()
 465 {
 466         path_share = STATIC_SHAREDIR;
 467         path_user  = std::string(getenv("HOME")) + DIR_DELIM "."
 468                 + lowercase(PROJECT_NAME);
 469         return true;
 470 }
 471
 472
 473 #endif
 474
 475 void migrateCachePath()
 476 {
 477         const std::string local_cache_path = path_user + DIR_DELIM + "cache";
 478
 479         // Delete tmp folder if it exists (it only ever contained
 480         // a temporary ogg file, which is no longer used).
 481         if (fs::PathExists(local_cache_path + DIR_DELIM + "tmp"))
 482                 fs::RecursiveDelete(local_cache_path + DIR_DELIM + "tmp");
 483
 484         // Bail if migration impossible
 485         if (path_cache == local_cache_path || !fs::PathExists(local_cache_path)
 486                         || fs::PathExists(path_cache)) {
 487                 return;
 488         }
 489         if (!fs::Rename(local_cache_path, path_cache)) {
 490                 errorstream << "Failed to migrate local cache path "
 491                         "to system path!" << std::endl;
 492         }
 493 }
 494
 495 void initializePaths()
 496 {
 497 #if RUN_IN_PLACE
 498         char buf[BUFSIZ];
 499
 500         infostream << "Using relative paths (RUN_IN_PLACE)" << std::endl;
 501
 502         bool success =
 503                 getCurrentExecPath(buf, sizeof(buf)) ||
 504                 getExecPathFromProcfs(buf, sizeof(buf));
 505
 506         if (success) {
 507                 pathRemoveFile(buf, DIR_DELIM_CHAR);
 508                 std::string execpath(buf);
 509
 510                 path_share = execpath + DIR_DELIM "..";
 511                 path_user  = execpath + DIR_DELIM "..";
 512
 513                 if (detectMSVCBuildDir(execpath)) {
 514                         path_share += DIR_DELIM "..";
 515                         path_user  += DIR_DELIM "..";
 516                 }
 517         } else {
 518                 errorstream << "Failed to get paths by executable location, "
 519                         "trying cwd" << std::endl;
 520
 521                 if (!getCurrentWorkingDir(buf, sizeof(buf)))
 522                         FATAL_ERROR("Ran out of methods to get paths");
 523
 524                 size_t cwdlen = strlen(buf);
 525                 if (cwdlen >= 1 && buf[cwdlen - 1] == DIR_DELIM_CHAR) {
 526                         cwdlen--;
 527                         buf[cwdlen] = '\0';
 528                 }
 529
 530                 if (cwdlen >= 4 && !strcmp(buf + cwdlen - 4, DIR_DELIM "bin"))
 531                         pathRemoveFile(buf, DIR_DELIM_CHAR);
 532
 533                 std::string execpath(buf);
 534
 535                 path_share = execpath;
 536                 path_user  = execpath;
 537         }
 538         path_cache = path_user + DIR_DELIM + "cache";
 539 #else
 540         infostream << "Using system-wide paths (NOT RUN_IN_PLACE)" << std::endl;
 541
 542         if (!setSystemPaths())
 543                 errorstream << "Failed to get one or more system-wide path" << std::endl;
 544
 545         // Initialize path_cache
 546         // First try $XDG_CACHE_HOME/PROJECT_NAME
 547         const char *cache_dir = getenv("XDG_CACHE_HOME");
 548         const char *home_dir = getenv("HOME");
 549         if (cache_dir) {
 550                 path_cache = std::string(cache_dir) + DIR_DELIM + PROJECT_NAME;
 551         } else if (home_dir) {
 552                 // Then try $HOME/.cache/PROJECT_NAME
 553                 path_cache = std::string(home_dir) + DIR_DELIM + ".cache"
 554                         + DIR_DELIM + PROJECT_NAME;
 555         } else {
 556                 // If neither works, use $PATH_USER/cache
 557                 path_cache = path_user + DIR_DELIM + "cache";
 558         }
 559         // Migrate cache folder to new location if possible
 560         migrateCachePath();
 561 #endif
 562
 563         infostream << "Detected share path: " << path_share << std::endl;
 564         infostream << "Detected user path: " << path_user << std::endl;
 565         infostream << "Detected cache path: " << path_cache << std::endl;
 566
 567 #ifdef USE_GETTEXT
 568         bool found_localedir = false;
 569 #  ifdef STATIC_LOCALEDIR
 570         if (STATIC_LOCALEDIR[0] && fs::PathExists(STATIC_LOCALEDIR)) {
 571                 found_localedir = true;
 572                 path_locale = STATIC_LOCALEDIR;
 573                 infostream << "Using locale directory " << STATIC_LOCALEDIR << std::endl;
 574         } else {
 575                 path_locale = getDataPath("locale");
 576                 if (fs::PathExists(path_locale)) {
 577                         found_localedir = true;
 578                         infostream << "Using in-place locale directory " << path_locale
 579                                 << " even though a static one was provided "
 580                                 << "(RUN_IN_PLACE or CUSTOM_LOCALEDIR)." << std::endl;
 581                 }
 582         }
 583 #  else
 584         path_locale = getDataPath("locale");
 585         if (fs::PathExists(path_locale)) {
 586                 found_localedir = true;
 587         }
 588 #  endif
 589         if (!found_localedir) {
 590                 warningstream << "Couldn't find a locale directory!" << std::endl;
 591         }
 592 #endif  // USE_GETTEXT
 593 }
 594
 595
 596
 597 void setXorgClassHint(const video::SExposedVideoData &video_data,
 598         const std::string &name)
 599 {
 600 #ifdef XORG_USED
 601         if (video_data.OpenGLLinux.X11Display == NULL)
 602                 return;
 603
 604         XClassHint *classhint = XAllocClassHint();
 605         classhint->res_name  = (char *)name.c_str();
 606         classhint->res_class = (char *)name.c_str();
 607
 608         XSetClassHint((Display *)video_data.OpenGLLinux.X11Display,
 609                 video_data.OpenGLLinux.X11Window, classhint);
 610         XFree(classhint);
 611 #endif
 612 }
 613
 614 bool setXorgWindowIcon(IrrlichtDevice *device,
 615         const std::string &icon_file)
 616 {
 617 #ifdef XORG_USED
 618
 619         video::IVideoDriver *v_driver = device->getVideoDriver();
 620
 621         video::IImageLoader *image_loader = NULL;
 622         u32 cnt = v_driver->getImageLoaderCount();
 623         for (u32 i = 0; i < cnt; i++) {
 624                 if (v_driver->getImageLoader(i)->isALoadableFileExtension(icon_file.c_str())) {
 625                         image_loader = v_driver->getImageLoader(i);
 626                         break;
 627                 }
 628         }
 629
 630         if (!image_loader) {
 631                 warningstream << "Could not find image loader for file '"
 632                         << icon_file << "'" << std::endl;
 633                 return false;
 634         }
 635
 636         io::IReadFile *icon_f = device->getFileSystem()->createAndOpenFile(icon_file.c_str());
 637
 638         if (!icon_f) {
 639                 warningstream << "Could not load icon file '"
 640                         << icon_file << "'" << std::endl;
 641                 return false;
 642         }
 643
 644         video::IImage *img = image_loader->loadImage(icon_f);
 645
 646         if (!img) {
 647                 warningstream << "Could not load icon file '"
 648                         << icon_file << "'" << std::endl;
 649                 icon_f->drop();
 650                 return false;
 651         }
 652
 653         u32 height = img->getDimension().Height;
 654         u32 width = img->getDimension().Width;
 655
 656         size_t icon_buffer_len = 2 + height * width;
 657         long *icon_buffer = new long[icon_buffer_len];
 658
 659         icon_buffer[0] = width;
 660         icon_buffer[1] = height;
 661
 662         for (u32 x = 0; x < width; x++) {
 663                 for (u32 y = 0; y < height; y++) {
 664                         video::SColor col = img->getPixel(x, y);
 665                         long pixel_val = 0;
 666                         pixel_val |= (u8)col.getAlpha() << 24;
 667                         pixel_val |= (u8)col.getRed() << 16;
 668                         pixel_val |= (u8)col.getGreen() << 8;
 669                         pixel_val |= (u8)col.getBlue();
 670                         icon_buffer[2 + x + y * width] = pixel_val;
 671                 }
 672         }
 673
 674         img->drop();
 675         icon_f->drop();
 676
 677         const video::SExposedVideoData &video_data = v_driver->getExposedVideoData();
 678
 679         Display *x11_dpl = (Display *)video_data.OpenGLLinux.X11Display;
 680
 681         if (x11_dpl == NULL) {
 682                 warningstream << "Could not find x11 display for setting its icon."
 683                         << std::endl;
 684                 delete [] icon_buffer;
 685                 return false;
 686         }
 687
 688         Window x11_win = (Window)video_data.OpenGLLinux.X11Window;
 689
 690         Atom net_wm_icon = XInternAtom(x11_dpl, "_NET_WM_ICON", False);
 691         Atom cardinal = XInternAtom(x11_dpl, "CARDINAL", False);
 692         XChangeProperty(x11_dpl, x11_win,
 693                 net_wm_icon, cardinal, 32,
 694                 PropModeReplace, (const unsigned char *)icon_buffer,
 695                 icon_buffer_len);
 696
 697         delete [] icon_buffer;
 698
 699 #endif
 700         return true;
 701 }
 702
 703 ////
 704 //// Video/Display Information (Client-only)
 705 ////
 706
 707 #ifndef SERVER
 708
 709 static irr::IrrlichtDevice *device;
 710
 711 void initIrrlicht(irr::IrrlichtDevice *device_)
 712 {
 713         device = device_;
 714 }
 715
 716 v2u32 getWindowSize()
 717 {
 718         return device->getVideoDriver()->getScreenSize();
 719 }
 720
 721
 722 std::vector<core::vector3d<u32> > getSupportedVideoModes()
 723 {
 724         IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
 725         sanity_check(nulldevice != NULL);
 726
 727         std::vector<core::vector3d<u32> > mlist;
 728         video::IVideoModeList *modelist = nulldevice->getVideoModeList();
 729
 730         u32 num_modes = modelist->getVideoModeCount();
 731         for (u32 i = 0; i != num_modes; i++) {
 732                 core::dimension2d<u32> mode_res = modelist->getVideoModeResolution(i);
 733                 s32 mode_depth = modelist->getVideoModeDepth(i);
 734                 mlist.push_back(core::vector3d<u32>(mode_res.Width, mode_res.Height, mode_depth));
 735         }
 736
 737         nulldevice->drop();
 738
 739         return mlist;
 740 }
 741
 742 std::vector<irr::video::E_DRIVER_TYPE> getSupportedVideoDrivers()
 743 {
 744         std::vector<irr::video::E_DRIVER_TYPE> drivers;
 745
 746         for (int i = 0; i != irr::video::EDT_COUNT; i++) {
 747                 if (irr::IrrlichtDevice::isDriverSupported((irr::video::E_DRIVER_TYPE)i))
 748                         drivers.push_back((irr::video::E_DRIVER_TYPE)i);
 749         }
 750
 751         return drivers;
 752 }
 753
 754 const char *getVideoDriverName(irr::video::E_DRIVER_TYPE type)
 755 {
 756         static const char *driver_ids[] = {
 757                 "null",
 758                 "software",
 759                 "burningsvideo",
 760                 "direct3d8",
 761                 "direct3d9",
 762                 "opengl",
 763                 "ogles1",
 764                 "ogles2",
 765         };
 766
 767         return driver_ids[type];
 768 }
 769
 770
 771 const char *getVideoDriverFriendlyName(irr::video::E_DRIVER_TYPE type)
 772 {
 773         static const char *driver_names[] = {
 774                 "NULL Driver",
 775                 "Software Renderer",
 776                 "Burning's Video",
 777                 "Direct3D 8",
 778                 "Direct3D 9",
 779                 "OpenGL",
 780                 "OpenGL ES1",
 781                 "OpenGL ES2",
 782         };
 783
 784         return driver_names[type];
 785 }
 786
 787 #       ifndef __ANDROID__
 788 #               ifdef XORG_USED
 789
 790 static float calcDisplayDensity()
 791 {
 792         const char *current_display = getenv("DISPLAY");
 793
 794         if (current_display != NULL) {
 795                 Display *x11display = XOpenDisplay(current_display);
 796
 797                 if (x11display != NULL) {
 798                         /* try x direct */
 799                         float dpi_height = floor(DisplayHeight(x11display, 0) /
 800                                                         (DisplayHeightMM(x11display, 0) * 0.039370) + 0.5);
 801                         float dpi_width = floor(DisplayWidth(x11display, 0) /
 802                                                         (DisplayWidthMM(x11display, 0) * 0.039370) + 0.5);
 803
 804                         XCloseDisplay(x11display);
 805
 806                         return std::max(dpi_height,dpi_width) / 96.0;
 807                 }
 808         }
 809
 810         /* return manually specified dpi */
 811         return g_settings->getFloat("screen_dpi")/96.0;
 812 }
 813
 814
 815 float getDisplayDensity()
 816 {
 817         static float cached_display_density = calcDisplayDensity();
 818         return cached_display_density;
 819 }
 820
 821
 822 #               else // XORG_USED
 823 float getDisplayDensity()
 824 {
 825         return g_settings->getFloat("screen_dpi")/96.0;
 826 }
 827 #               endif // XORG_USED
 828
 829 v2u32 getDisplaySize()
 830 {
 831         IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
 832
 833         core::dimension2d<u32> deskres = nulldevice->getVideoModeList()->getDesktopResolution();
 834         nulldevice -> drop();
 835
 836         return deskres;
 837 }
 838 #       endif // __ANDROID__
 839 #endif // SERVER
 840
 841
 842 ////
 843 //// OS-specific Secure Random
 844 ////
 845
 846 #ifdef WIN32
 847
 848 bool secure_rand_fill_buf(void *buf, size_t len)
 849 {
 850         HCRYPTPROV wctx;
 851
 852         if (!CryptAcquireContext(&wctx, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
 853                 return false;
 854
 855         CryptGenRandom(wctx, len, (BYTE *)buf);
 856         CryptReleaseContext(wctx, 0);
 857         return true;
 858 }
 859
 860 #else
 861
 862 bool secure_rand_fill_buf(void *buf, size_t len)
 863 {
 864         // N.B.  This function checks *only* for /dev/urandom, because on most
 865         // common OSes it is non-blocking, whereas /dev/random is blocking, and it
 866         // is exceptionally uncommon for there to be a situation where /dev/random
 867         // exists but /dev/urandom does not.  This guesswork is necessary since
 868         // random devices are not covered by any POSIX standard...
 869         FILE *fp = fopen("/dev/urandom", "rb");
 870         if (!fp)
 871                 return false;
 872
 873         bool success = fread(buf, len, 1, fp) == 1;
 874
 875         fclose(fp);
 876         return success;
 877 }
 878
 879 #endif
 880
 881 } //namespace porting