src/client/renderingengine.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4 Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21 #include <IrrlichtDevice.h>
  22 #include <irrlicht.h>
  23 #include "fontengine.h"
  24 #include "client.h"
  25 #include "clouds.h"
  26 #include "util/numeric.h"
  27 #include "guiscalingfilter.h"
  28 #include "localplayer.h"
  29 #include "client/hud.h"
  30 #include "camera.h"
  31 #include "minimap.h"
  32 #include "clientmap.h"
  33 #include "renderingengine.h"
  34 #include "render/core.h"
  35 #include "render/factory.h"
  36 #include "inputhandler.h"
  37 #include "gettext.h"
  38 #include "../gui/guiSkin.h"
  39
  40 #if !defined(_WIN32) && !defined(__APPLE__) && !defined(__ANDROID__) && \
  41                 !defined(SERVER) && !defined(__HAIKU__)
  42 #define XORG_USED
  43 #endif
  44 #ifdef XORG_USED
  45 #include <X11/Xlib.h>
  46 #include <X11/Xutil.h>
  47 #include <X11/Xatom.h>
  48 #endif
  49
  50 #ifdef _WIN32
  51 #include <windows.h>
  52 #include <winuser.h>
  53 #endif
  54
  55 #if ENABLE_GLES
  56 #include "filesys.h"
  57 #endif
  58
  59 RenderingEngine *RenderingEngine::s_singleton = nullptr;
  60
  61
  62 static gui::GUISkin *createSkin(gui::IGUIEnvironment *environment,
  63                 gui::EGUI_SKIN_TYPE type, video::IVideoDriver *driver)
  64 {
  65         gui::GUISkin *skin = new gui::GUISkin(type, driver);
  66
  67         gui::IGUIFont *builtinfont = environment->getBuiltInFont();
  68         gui::IGUIFontBitmap *bitfont = nullptr;
  69         if (builtinfont && builtinfont->getType() == gui::EGFT_BITMAP)
  70                 bitfont = (gui::IGUIFontBitmap*)builtinfont;
  71
  72         gui::IGUISpriteBank *bank = 0;
  73         skin->setFont(builtinfont);
  74
  75         if (bitfont)
  76                 bank = bitfont->getSpriteBank();
  77
  78         skin->setSpriteBank(bank);
  79
  80         return skin;
  81 }
  82
  83
  84 RenderingEngine::RenderingEngine(IEventReceiver *receiver)
  85 {
  86         sanity_check(!s_singleton);
  87
  88         // Resolution selection
  89         bool fullscreen = g_settings->getBool("fullscreen");
  90         u16 screen_w = g_settings->getU16("screen_w");
  91         u16 screen_h = g_settings->getU16("screen_h");
  92
  93         // bpp, fsaa, vsync
  94         bool vsync = g_settings->getBool("vsync");
  95         u16 fsaa = g_settings->getU16("fsaa");
  96
  97         // stereo buffer required for pageflip stereo
  98         bool stereo_buffer = g_settings->get("3d_mode") == "pageflip";
  99
 100         // Determine driver
 101         video::E_DRIVER_TYPE driverType = video::EDT_OPENGL;
 102         const std::string &driverstring = g_settings->get("video_driver");
 103         std::vector<video::E_DRIVER_TYPE> drivers =
 104                         RenderingEngine::getSupportedVideoDrivers();
 105         u32 i;
 106         for (i = 0; i != drivers.size(); i++) {
 107                 if (!strcasecmp(driverstring.c_str(),
 108                                 RenderingEngine::getVideoDriverName(drivers[i]))) {
 109                         driverType = drivers[i];
 110                         break;
 111                 }
 112         }
 113         if (i == drivers.size()) {
 114                 errorstream << "Invalid video_driver specified; "
 115                                "defaulting to opengl"
 116                             << std::endl;
 117         }
 118
 119         SIrrlichtCreationParameters params = SIrrlichtCreationParameters();
 120         if (g_logger.getTraceEnabled())
 121                 params.LoggingLevel = irr::ELL_DEBUG;
 122         params.DriverType = driverType;
 123         params.WindowSize = core::dimension2d<u32>(screen_w, screen_h);
 124         params.AntiAlias = fsaa;
 125         params.Fullscreen = fullscreen;
 126         params.Stencilbuffer = false;
 127         params.Stereobuffer = stereo_buffer;
 128         params.Vsync = vsync;
 129         params.EventReceiver = receiver;
 130         params.HighPrecisionFPU = true;
 131 #ifdef __ANDROID__
 132         params.PrivateData = porting::app_global;
 133 #endif
 134 #if ENABLE_GLES
 135         // there is no standardized path for these on desktop
 136         std::string rel_path = std::string("client") + DIR_DELIM
 137                         + "shaders" + DIR_DELIM + "Irrlicht";
 138         params.OGLES2ShaderPath = (porting::path_share + DIR_DELIM + rel_path + DIR_DELIM).c_str();
 139 #endif
 140
 141         m_device = createDeviceEx(params);
 142         driver = m_device->getVideoDriver();
 143
 144         s_singleton = this;
 145
 146         auto skin = createSkin(m_device->getGUIEnvironment(),
 147                         gui::EGST_WINDOWS_METALLIC, driver);
 148         m_device->getGUIEnvironment()->setSkin(skin);
 149         skin->drop();
 150 }
 151
 152 RenderingEngine::~RenderingEngine()
 153 {
 154         core.reset();
 155         m_device->closeDevice();
 156         s_singleton = nullptr;
 157 }
 158
 159 v2u32 RenderingEngine::_getWindowSize() const
 160 {
 161         if (core)
 162                 return core->getVirtualSize();
 163         return m_device->getVideoDriver()->getScreenSize();
 164 }
 165
 166 void RenderingEngine::setResizable(bool resize)
 167 {
 168         m_device->setResizable(resize);
 169 }
 170
 171 void RenderingEngine::removeMesh(const scene::IMesh* mesh)
 172 {
 173         m_device->getSceneManager()->getMeshCache()->removeMesh(mesh);
 174 }
 175
 176 void RenderingEngine::cleanupMeshCache()
 177 {
 178         auto mesh_cache = m_device->getSceneManager()->getMeshCache();
 179         while (mesh_cache->getMeshCount() != 0) {
 180                 if (scene::IAnimatedMesh *mesh = mesh_cache->getMeshByIndex(0))
 181                         mesh_cache->removeMesh(mesh);
 182         }
 183 }
 184
 185 bool RenderingEngine::setupTopLevelWindow(const std::string &name)
 186 {
 187         // FIXME: It would make more sense for there to be a switch of some
 188         // sort here that would call the correct toplevel setup methods for
 189         // the environment Minetest is running in.
 190
 191         /* Setting Xorg properties for the top level window */
 192         setupTopLevelXorgWindow(name);
 193
 194         /* Setting general properties for the top level window */
 195         verbosestream << "Client: Configuring general top level"
 196                 << " window properties"
 197                 << std::endl;
 198         bool result = setWindowIcon();
 199
 200         return result;
 201 }
 202
 203 void RenderingEngine::setupTopLevelXorgWindow(const std::string &name)
 204 {
 205 #ifdef XORG_USED
 206         const video::SExposedVideoData exposedData = driver->getExposedVideoData();
 207
 208         Display *x11_dpl = reinterpret_cast<Display *>(exposedData.OpenGLLinux.X11Display);
 209         if (x11_dpl == NULL) {
 210                 warningstream << "Client: Could not find X11 Display in ExposedVideoData"
 211                         << std::endl;
 212                 return;
 213         }
 214
 215         verbosestream << "Client: Configuring X11-specific top level"
 216                 << " window properties"
 217                 << std::endl;
 218
 219
 220         Window x11_win = reinterpret_cast<Window>(exposedData.OpenGLLinux.X11Window);
 221
 222         // Set application name and class hints. For now name and class are the same.
 223         XClassHint *classhint = XAllocClassHint();
 224         classhint->res_name = const_cast<char *>(name.c_str());
 225         classhint->res_class = const_cast<char *>(name.c_str());
 226
 227         XSetClassHint(x11_dpl, x11_win, classhint);
 228         XFree(classhint);
 229
 230         // FIXME: In the future WMNormalHints should be set ... e.g see the
 231         // gtk/gdk code (gdk/x11/gdksurface-x11.c) for the setup_top_level
 232         // method. But for now (as it would require some significant changes)
 233         // leave the code as is.
 234
 235         // The following is borrowed from the above gdk source for setting top
 236         // level windows. The source indicates and the Xlib docs suggest that
 237         // this will set the WM_CLIENT_MACHINE and WM_LOCAL_NAME. This will not
 238         // set the WM_CLIENT_MACHINE to a Fully Qualified Domain Name (FQDN) which is
 239         // required by the Extended Window Manager Hints (EWMH) spec when setting
 240         // the _NET_WM_PID (see further down) but running Minetest in an env
 241         // where the window manager is on another machine from Minetest (therefore
 242         // making the PID useless) is not expected to be a problem. Further
 243         // more, using gtk/gdk as the model it would seem that not using a FQDN is
 244         // not an issue for modern Xorg window managers.
 245
 246         verbosestream << "Client: Setting Xorg window manager Properties"
 247                 << std::endl;
 248
 249         XSetWMProperties (x11_dpl, x11_win, NULL, NULL, NULL, 0, NULL, NULL, NULL);
 250
 251         // Set the _NET_WM_PID window property according to the EWMH spec. _NET_WM_PID
 252         // (in conjunction with WM_CLIENT_MACHINE) can be used by window managers to
 253         // force a shutdown of an application if it doesn't respond to the destroy
 254         // window message.
 255
 256         verbosestream << "Client: Setting Xorg _NET_WM_PID extened window manager property"
 257                 << std::endl;
 258
 259         Atom NET_WM_PID = XInternAtom(x11_dpl, "_NET_WM_PID", false);
 260
 261         pid_t pid = getpid();
 262
 263         XChangeProperty(x11_dpl, x11_win, NET_WM_PID,
 264                         XA_CARDINAL, 32, PropModeReplace,
 265                         reinterpret_cast<unsigned char *>(&pid),1);
 266
 267         // Set the WM_CLIENT_LEADER window property here. Minetest has only one
 268         // window and that window will always be the leader.
 269
 270         verbosestream << "Client: Setting Xorg WM_CLIENT_LEADER property"
 271                 << std::endl;
 272
 273         Atom WM_CLIENT_LEADER = XInternAtom(x11_dpl, "WM_CLIENT_LEADER", false);
 274
 275         XChangeProperty (x11_dpl, x11_win, WM_CLIENT_LEADER,
 276                 XA_WINDOW, 32, PropModeReplace,
 277                 reinterpret_cast<unsigned char *>(&x11_win), 1);
 278 #endif
 279 }
 280
 281 #ifdef _WIN32
 282 static bool getWindowHandle(irr::video::IVideoDriver *driver, HWND &hWnd)
 283 {
 284         const video::SExposedVideoData exposedData = driver->getExposedVideoData();
 285
 286         switch (driver->getDriverType()) {
 287 #if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR < 9
 288         case video::EDT_DIRECT3D8:
 289                 hWnd = reinterpret_cast<HWND>(exposedData.D3D8.HWnd);
 290                 break;
 291 #endif
 292         case video::EDT_DIRECT3D9:
 293                 hWnd = reinterpret_cast<HWND>(exposedData.D3D9.HWnd);
 294                 break;
 295 #if ENABLE_GLES
 296         case video::EDT_OGLES1:
 297         case video::EDT_OGLES2:
 298 #endif
 299         case video::EDT_OPENGL:
 300                 hWnd = reinterpret_cast<HWND>(exposedData.OpenGLWin32.HWnd);
 301                 break;
 302         default:
 303                 return false;
 304         }
 305
 306         return true;
 307 }
 308 #endif
 309
 310 bool RenderingEngine::setWindowIcon()
 311 {
 312 #if defined(XORG_USED)
 313 #if RUN_IN_PLACE
 314         return setXorgWindowIconFromPath(
 315                         porting::path_share + "/misc/" PROJECT_NAME "-xorg-icon-128.png");
 316 #else
 317         // We have semi-support for reading in-place data if we are
 318         // compiled with RUN_IN_PLACE. Don't break with this and
 319         // also try the path_share location.
 320         return setXorgWindowIconFromPath(
 321                                ICON_DIR "/hicolor/128x128/apps/" PROJECT_NAME ".png") ||
 322                setXorgWindowIconFromPath(porting::path_share + "/misc/" PROJECT_NAME
 323                                                                "-xorg-icon-128.png");
 324 #endif
 325 #elif defined(_WIN32)
 326         HWND hWnd; // Window handle
 327         if (!getWindowHandle(driver, hWnd))
 328                 return false;
 329
 330         // Load the ICON from resource file
 331         const HICON hicon = LoadIcon(GetModuleHandle(NULL),
 332                         MAKEINTRESOURCE(130) // The ID of the ICON defined in
 333                                              // winresource.rc
 334         );
 335
 336         if (hicon) {
 337                 SendMessage(hWnd, WM_SETICON, ICON_BIG, reinterpret_cast<LPARAM>(hicon));
 338                 SendMessage(hWnd, WM_SETICON, ICON_SMALL,
 339                                 reinterpret_cast<LPARAM>(hicon));
 340                 return true;
 341         }
 342         return false;
 343 #else
 344         return false;
 345 #endif
 346 }
 347
 348 bool RenderingEngine::setXorgWindowIconFromPath(const std::string &icon_file)
 349 {
 350 #ifdef XORG_USED
 351
 352         video::IImageLoader *image_loader = NULL;
 353         u32 cnt = driver->getImageLoaderCount();
 354         for (u32 i = 0; i < cnt; i++) {
 355                 if (driver->getImageLoader(i)->isALoadableFileExtension(
 356                                     icon_file.c_str())) {
 357                         image_loader = driver->getImageLoader(i);
 358                         break;
 359                 }
 360         }
 361
 362         if (!image_loader) {
 363                 warningstream << "Could not find image loader for file '" << icon_file
 364                               << "'" << std::endl;
 365                 return false;
 366         }
 367
 368         io::IReadFile *icon_f =
 369                         m_device->getFileSystem()->createAndOpenFile(icon_file.c_str());
 370
 371         if (!icon_f) {
 372                 warningstream << "Could not load icon file '" << icon_file << "'"
 373                               << std::endl;
 374                 return false;
 375         }
 376
 377         video::IImage *img = image_loader->loadImage(icon_f);
 378
 379         if (!img) {
 380                 warningstream << "Could not load icon file '" << icon_file << "'"
 381                               << std::endl;
 382                 icon_f->drop();
 383                 return false;
 384         }
 385
 386         u32 height = img->getDimension().Height;
 387         u32 width = img->getDimension().Width;
 388
 389         size_t icon_buffer_len = 2 + height * width;
 390         long *icon_buffer = new long[icon_buffer_len];
 391
 392         icon_buffer[0] = width;
 393         icon_buffer[1] = height;
 394
 395         for (u32 x = 0; x < width; x++) {
 396                 for (u32 y = 0; y < height; y++) {
 397                         video::SColor col = img->getPixel(x, y);
 398                         long pixel_val = 0;
 399                         pixel_val |= (u8)col.getAlpha() << 24;
 400                         pixel_val |= (u8)col.getRed() << 16;
 401                         pixel_val |= (u8)col.getGreen() << 8;
 402                         pixel_val |= (u8)col.getBlue();
 403                         icon_buffer[2 + x + y * width] = pixel_val;
 404                 }
 405         }
 406
 407         img->drop();
 408         icon_f->drop();
 409
 410         const video::SExposedVideoData &video_data = driver->getExposedVideoData();
 411
 412         Display *x11_dpl = (Display *)video_data.OpenGLLinux.X11Display;
 413
 414         if (x11_dpl == NULL) {
 415                 warningstream << "Could not find x11 display for setting its icon."
 416                               << std::endl;
 417                 delete[] icon_buffer;
 418                 return false;
 419         }
 420
 421         Window x11_win = (Window)video_data.OpenGLLinux.X11Window;
 422
 423         Atom net_wm_icon = XInternAtom(x11_dpl, "_NET_WM_ICON", False);
 424         Atom cardinal = XInternAtom(x11_dpl, "CARDINAL", False);
 425         XChangeProperty(x11_dpl, x11_win, net_wm_icon, cardinal, 32, PropModeReplace,
 426                         (const unsigned char *)icon_buffer, icon_buffer_len);
 427
 428         delete[] icon_buffer;
 429
 430 #endif
 431         return true;
 432 }
 433
 434 /*
 435         Draws a screen with a single text on it.
 436         Text will be removed when the screen is drawn the next time.
 437         Additionally, a progressbar can be drawn when percent is set between 0 and 100.
 438 */
 439 void RenderingEngine::draw_load_screen(const std::wstring &text,
 440                 gui::IGUIEnvironment *guienv, ITextureSource *tsrc, float dtime,
 441                 int percent, bool clouds)
 442 {
 443         v2u32 screensize = getWindowSize();
 444
 445         v2s32 textsize(g_fontengine->getTextWidth(text), g_fontengine->getLineHeight());
 446         v2s32 center(screensize.X / 2, screensize.Y / 2);
 447         core::rect<s32> textrect(center - textsize / 2, center + textsize / 2);
 448
 449         gui::IGUIStaticText *guitext =
 450                         guienv->addStaticText(text.c_str(), textrect, false, false);
 451         guitext->setTextAlignment(gui::EGUIA_CENTER, gui::EGUIA_UPPERLEFT);
 452
 453         bool cloud_menu_background = clouds && g_settings->getBool("menu_clouds");
 454         if (cloud_menu_background) {
 455                 g_menuclouds->step(dtime * 3);
 456                 g_menuclouds->render();
 457                 get_video_driver()->beginScene(
 458                                 true, true, video::SColor(255, 140, 186, 250));
 459                 g_menucloudsmgr->drawAll();
 460         } else
 461                 get_video_driver()->beginScene(true, true, video::SColor(255, 0, 0, 0));
 462
 463         // draw progress bar
 464         if ((percent >= 0) && (percent <= 100)) {
 465                 video::ITexture *progress_img = tsrc->getTexture("progress_bar.png");
 466                 video::ITexture *progress_img_bg =
 467                                 tsrc->getTexture("progress_bar_bg.png");
 468
 469                 if (progress_img && progress_img_bg) {
 470 #ifndef __ANDROID__
 471                         const core::dimension2d<u32> &img_size =
 472                                         progress_img_bg->getSize();
 473                         u32 imgW = rangelim(img_size.Width, 200, 600);
 474                         u32 imgH = rangelim(img_size.Height, 24, 72);
 475 #else
 476                         const core::dimension2d<u32> img_size(256, 48);
 477                         float imgRatio = (float)img_size.Height / img_size.Width;
 478                         u32 imgW = screensize.X / 2.2f;
 479                         u32 imgH = floor(imgW * imgRatio);
 480 #endif
 481                         v2s32 img_pos((screensize.X - imgW) / 2,
 482                                         (screensize.Y - imgH) / 2);
 483
 484                         draw2DImageFilterScaled(get_video_driver(), progress_img_bg,
 485                                         core::rect<s32>(img_pos.X, img_pos.Y,
 486                                                         img_pos.X + imgW,
 487                                                         img_pos.Y + imgH),
 488                                         core::rect<s32>(0, 0, img_size.Width,
 489                                                         img_size.Height),
 490                                         0, 0, true);
 491
 492                         draw2DImageFilterScaled(get_video_driver(), progress_img,
 493                                         core::rect<s32>(img_pos.X, img_pos.Y,
 494                                                         img_pos.X + (percent * imgW) / 100,
 495                                                         img_pos.Y + imgH),
 496                                         core::rect<s32>(0, 0,
 497                                                         (percent * img_size.Width) / 100,
 498                                                         img_size.Height),
 499                                         0, 0, true);
 500                 }
 501         }
 502
 503         guienv->drawAll();
 504         get_video_driver()->endScene();
 505         guitext->remove();
 506 }
 507
 508 /*
 509         Draws the menu scene including (optional) cloud background.
 510 */
 511 void RenderingEngine::draw_menu_scene(gui::IGUIEnvironment *guienv,
 512                 float dtime, bool clouds)
 513 {
 514         bool cloud_menu_background = clouds && g_settings->getBool("menu_clouds");
 515         if (cloud_menu_background) {
 516                 g_menuclouds->step(dtime * 3);
 517                 g_menuclouds->render();
 518                 get_video_driver()->beginScene(
 519                                 true, true, video::SColor(255, 140, 186, 250));
 520                 g_menucloudsmgr->drawAll();
 521         } else
 522                 get_video_driver()->beginScene(true, true, video::SColor(255, 0, 0, 0));
 523
 524         guienv->drawAll();
 525         get_video_driver()->endScene();
 526 }
 527
 528 std::vector<irr::video::E_DRIVER_TYPE> RenderingEngine::getSupportedVideoDrivers()
 529 {
 530         std::vector<irr::video::E_DRIVER_TYPE> drivers;
 531
 532         for (int i = 0; i != irr::video::EDT_COUNT; i++) {
 533                 if (irr::IrrlichtDevice::isDriverSupported((irr::video::E_DRIVER_TYPE)i))
 534                         drivers.push_back((irr::video::E_DRIVER_TYPE)i);
 535         }
 536
 537         return drivers;
 538 }
 539
 540 void RenderingEngine::initialize(Client *client, Hud *hud)
 541 {
 542         const std::string &draw_mode = g_settings->get("3d_mode");
 543         core.reset(createRenderingCore(draw_mode, m_device, client, hud));
 544         core->initialize();
 545 }
 546
 547 void RenderingEngine::finalize()
 548 {
 549         core.reset();
 550 }
 551
 552 void RenderingEngine::draw_scene(video::SColor skycolor, bool show_hud,
 553                 bool show_minimap, bool draw_wield_tool, bool draw_crosshair)
 554 {
 555         core->draw(skycolor, show_hud, show_minimap, draw_wield_tool, draw_crosshair);
 556 }
 557
 558 const char *RenderingEngine::getVideoDriverName(irr::video::E_DRIVER_TYPE type)
 559 {
 560         static const char *driver_ids[] = {
 561                         "null",
 562                         "software",
 563                         "burningsvideo",
 564                         "direct3d8",
 565                         "direct3d9",
 566                         "opengl",
 567                         "ogles1",
 568                         "ogles2",
 569         };
 570
 571         return driver_ids[type];
 572 }
 573
 574 const char *RenderingEngine::getVideoDriverFriendlyName(irr::video::E_DRIVER_TYPE type)
 575 {
 576         static const char *driver_names[] = {
 577                         "NULL Driver",
 578                         "Software Renderer",
 579                         "Burning's Video",
 580                         "Direct3D 8",
 581                         "Direct3D 9",
 582                         "OpenGL",
 583                         "OpenGL ES1",
 584                         "OpenGL ES2",
 585         };
 586
 587         return driver_names[type];
 588 }
 589
 590 #ifndef __ANDROID__
 591 #if defined(XORG_USED)
 592
 593 static float calcDisplayDensity()
 594 {
 595         const char *current_display = getenv("DISPLAY");
 596
 597         if (current_display != NULL) {
 598                 Display *x11display = XOpenDisplay(current_display);
 599
 600                 if (x11display != NULL) {
 601                         /* try x direct */
 602                         int dh = DisplayHeight(x11display, 0);
 603                         int dw = DisplayWidth(x11display, 0);
 604                         int dh_mm = DisplayHeightMM(x11display, 0);
 605                         int dw_mm = DisplayWidthMM(x11display, 0);
 606                         XCloseDisplay(x11display);
 607
 608                         if (dh_mm != 0 && dw_mm != 0) {
 609                                 float dpi_height = floor(dh / (dh_mm * 0.039370) + 0.5);
 610                                 float dpi_width = floor(dw / (dw_mm * 0.039370) + 0.5);
 611                                 return std::max(dpi_height, dpi_width) / 96.0;
 612                         }
 613                 }
 614         }
 615
 616         /* return manually specified dpi */
 617         return g_settings->getFloat("screen_dpi") / 96.0;
 618 }
 619
 620 float RenderingEngine::getDisplayDensity()
 621 {
 622         static float cached_display_density = calcDisplayDensity();
 623         return cached_display_density;
 624 }
 625
 626 #elif defined(_WIN32)
 627
 628
 629 static float calcDisplayDensity(irr::video::IVideoDriver *driver)
 630 {
 631         HWND hWnd;
 632         if (getWindowHandle(driver, hWnd)) {
 633                 HDC hdc = GetDC(hWnd);
 634                 float dpi = GetDeviceCaps(hdc, LOGPIXELSX);
 635                 ReleaseDC(hWnd, hdc);
 636                 return dpi / 96.0f;
 637         }
 638
 639         /* return manually specified dpi */
 640         return g_settings->getFloat("screen_dpi") / 96.0f;
 641 }
 642
 643 float RenderingEngine::getDisplayDensity()
 644 {
 645         static bool cached = false;
 646         static float display_density;
 647         if (!cached) {
 648                 display_density = calcDisplayDensity(get_video_driver());
 649                 cached = true;
 650         }
 651         return display_density;
 652 }
 653
 654 #else
 655
 656 float RenderingEngine::getDisplayDensity()
 657 {
 658         return g_settings->getFloat("screen_dpi") / 96.0;
 659 }
 660
 661 #endif
 662
 663 v2u32 RenderingEngine::getDisplaySize()
 664 {
 665         IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
 666
 667         core::dimension2d<u32> deskres =
 668                         nulldevice->getVideoModeList()->getDesktopResolution();
 669         nulldevice->drop();
 670
 671         return deskres;
 672 }
 673
 674 #else // __ANDROID__
 675 float RenderingEngine::getDisplayDensity()
 676 {
 677         return porting::getDisplayDensity();
 678 }
 679
 680 v2u32 RenderingEngine::getDisplaySize()
 681 {
 682         return porting::getDisplaySize();
 683 }
 684 #endif // __ANDROID__