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 "fontengine.h"
  23 #include "client.h"
  24 #include "clouds.h"
  25 #include "util/numeric.h"
  26 #include "guiscalingfilter.h"
  27 #include "localplayer.h"
  28 #include "client/hud.h"
  29 #include "camera.h"
  30 #include "minimap.h"
  31 #include "clientmap.h"
  32 #include "renderingengine.h"
  33 #include "render/core.h"
  34 #include "render/factory.h"
  35 #include "inputhandler.h"
  36 #include "gettext.h"
  37 #include "../gui/guiSkin.h"
  38
  39 #if !defined(_WIN32) && !defined(__APPLE__) && !defined(__ANDROID__) && \
  40                 !defined(SERVER) && !defined(__HAIKU__)
  41 #define XORG_USED
  42 #endif
  43 #ifdef XORG_USED
  44 #include <X11/Xlib.h>
  45 #include <X11/Xutil.h>
  46 #include <X11/Xatom.h>
  47 #endif
  48
  49 #ifdef _WIN32
  50 #include <windows.h>
  51 #include <winuser.h>
  52 #endif
  53
  54 #if ENABLE_GLES
  55 #include "filesys.h"
  56 #endif
  57
  58 RenderingEngine *RenderingEngine::s_singleton = nullptr;
  59
  60
  61 static gui::GUISkin *createSkin(gui::IGUIEnvironment *environment,
  62                 gui::EGUI_SKIN_TYPE type, video::IVideoDriver *driver)
  63 {
  64         gui::GUISkin *skin = new gui::GUISkin(type, driver);
  65
  66         gui::IGUIFont *builtinfont = environment->getBuiltInFont();
  67         gui::IGUIFontBitmap *bitfont = nullptr;
  68         if (builtinfont && builtinfont->getType() == gui::EGFT_BITMAP)
  69                 bitfont = (gui::IGUIFontBitmap*)builtinfont;
  70
  71         gui::IGUISpriteBank *bank = 0;
  72         skin->setFont(builtinfont);
  73
  74         if (bitfont)
  75                 bank = bitfont->getSpriteBank();
  76
  77         skin->setSpriteBank(bank);
  78
  79         return skin;
  80 }
  81
  82
  83 RenderingEngine::RenderingEngine(IEventReceiver *receiver)
  84 {
  85         sanity_check(!s_singleton);
  86
  87         // Resolution selection
  88         bool fullscreen = g_settings->getBool("fullscreen");
  89         u16 screen_w = g_settings->getU16("screen_w");
  90         u16 screen_h = g_settings->getU16("screen_h");
  91
  92         // bpp, fsaa, vsync
  93         bool vsync = g_settings->getBool("vsync");
  94         u16 fsaa = g_settings->getU16("fsaa");
  95
  96         // stereo buffer required for pageflip stereo
  97         bool stereo_buffer = g_settings->get("3d_mode") == "pageflip";
  98
  99         // Determine driver
 100         video::E_DRIVER_TYPE driverType = video::EDT_OPENGL;
 101         const std::string &driverstring = g_settings->get("video_driver");
 102         std::vector<video::E_DRIVER_TYPE> drivers =
 103                         RenderingEngine::getSupportedVideoDrivers();
 104         u32 i;
 105         for (i = 0; i != drivers.size(); i++) {
 106                 if (!strcasecmp(driverstring.c_str(),
 107                                 RenderingEngine::getVideoDriverInfo(drivers[i]).name.c_str())) {
 108                         driverType = drivers[i];
 109                         break;
 110                 }
 111         }
 112         if (i == drivers.size()) {
 113                 errorstream << "Invalid video_driver specified; "
 114                                "defaulting to opengl"
 115                             << std::endl;
 116         }
 117
 118         SIrrlichtCreationParameters params = SIrrlichtCreationParameters();
 119         if (tracestream)
 120                 params.LoggingLevel = irr::ELL_DEBUG;
 121         params.DriverType = driverType;
 122         params.WindowSize = core::dimension2d<u32>(screen_w, screen_h);
 123         params.AntiAlias = fsaa;
 124         params.Fullscreen = fullscreen;
 125         params.Stencilbuffer = false;
 126         params.Stereobuffer = stereo_buffer;
 127         params.Vsync = vsync;
 128         params.EventReceiver = receiver;
 129         params.HighPrecisionFPU = true;
 130 #ifdef __ANDROID__
 131         params.PrivateData = porting::app_global;
 132 #endif
 133 #if ENABLE_GLES
 134         // there is no standardized path for these on desktop
 135         std::string rel_path = std::string("client") + DIR_DELIM
 136                         + "shaders" + DIR_DELIM + "Irrlicht";
 137         params.OGLES2ShaderPath = (porting::path_share + DIR_DELIM + rel_path + DIR_DELIM).c_str();
 138 #endif
 139
 140         m_device = createDeviceEx(params);
 141         driver = m_device->getVideoDriver();
 142
 143         s_singleton = this;
 144
 145         auto skin = createSkin(m_device->getGUIEnvironment(),
 146                         gui::EGST_WINDOWS_METALLIC, driver);
 147         m_device->getGUIEnvironment()->setSkin(skin);
 148         skin->drop();
 149 }
 150
 151 RenderingEngine::~RenderingEngine()
 152 {
 153         core.reset();
 154         m_device->closeDevice();
 155         s_singleton = nullptr;
 156 }
 157
 158 v2u32 RenderingEngine::_getWindowSize() const
 159 {
 160         if (core)
 161                 return core->getVirtualSize();
 162         return m_device->getVideoDriver()->getScreenSize();
 163 }
 164
 165 void RenderingEngine::setResizable(bool resize)
 166 {
 167         m_device->setResizable(resize);
 168 }
 169
 170 void RenderingEngine::removeMesh(const scene::IMesh* mesh)
 171 {
 172         m_device->getSceneManager()->getMeshCache()->removeMesh(mesh);
 173 }
 174
 175 void RenderingEngine::cleanupMeshCache()
 176 {
 177         auto mesh_cache = m_device->getSceneManager()->getMeshCache();
 178         while (mesh_cache->getMeshCount() != 0) {
 179                 if (scene::IAnimatedMesh *mesh = mesh_cache->getMeshByIndex(0))
 180                         mesh_cache->removeMesh(mesh);
 181         }
 182 }
 183
 184 bool RenderingEngine::setupTopLevelWindow(const std::string &name)
 185 {
 186         // FIXME: It would make more sense for there to be a switch of some
 187         // sort here that would call the correct toplevel setup methods for
 188         // the environment Minetest is running in.
 189
 190         /* Setting Xorg properties for the top level window */
 191         setupTopLevelXorgWindow(name);
 192
 193         /* Setting general properties for the top level window */
 194         verbosestream << "Client: Configuring general top level"
 195                 << " window properties"
 196                 << std::endl;
 197         bool result = setWindowIcon();
 198
 199         return result;
 200 }
 201
 202 void RenderingEngine::setupTopLevelXorgWindow(const std::string &name)
 203 {
 204 #ifdef XORG_USED
 205         const video::SExposedVideoData exposedData = driver->getExposedVideoData();
 206
 207         Display *x11_dpl = reinterpret_cast<Display *>(exposedData.OpenGLLinux.X11Display);
 208         if (x11_dpl == NULL) {
 209                 warningstream << "Client: Could not find X11 Display in ExposedVideoData"
 210                         << std::endl;
 211                 return;
 212         }
 213
 214         verbosestream << "Client: Configuring X11-specific top level"
 215                 << " window properties"
 216                 << std::endl;
 217
 218
 219         Window x11_win = reinterpret_cast<Window>(exposedData.OpenGLLinux.X11Window);
 220
 221         // Set application name and class hints. For now name and class are the same.
 222         XClassHint *classhint = XAllocClassHint();
 223         classhint->res_name = const_cast<char *>(name.c_str());
 224         classhint->res_class = const_cast<char *>(name.c_str());
 225
 226         XSetClassHint(x11_dpl, x11_win, classhint);
 227         XFree(classhint);
 228
 229         // FIXME: In the future WMNormalHints should be set ... e.g see the
 230         // gtk/gdk code (gdk/x11/gdksurface-x11.c) for the setup_top_level
 231         // method. But for now (as it would require some significant changes)
 232         // leave the code as is.
 233
 234         // The following is borrowed from the above gdk source for setting top
 235         // level windows. The source indicates and the Xlib docs suggest that
 236         // this will set the WM_CLIENT_MACHINE and WM_LOCAL_NAME. This will not
 237         // set the WM_CLIENT_MACHINE to a Fully Qualified Domain Name (FQDN) which is
 238         // required by the Extended Window Manager Hints (EWMH) spec when setting
 239         // the _NET_WM_PID (see further down) but running Minetest in an env
 240         // where the window manager is on another machine from Minetest (therefore
 241         // making the PID useless) is not expected to be a problem. Further
 242         // more, using gtk/gdk as the model it would seem that not using a FQDN is
 243         // not an issue for modern Xorg window managers.
 244
 245         verbosestream << "Client: Setting Xorg window manager Properties"
 246                 << std::endl;
 247
 248         XSetWMProperties (x11_dpl, x11_win, NULL, NULL, NULL, 0, NULL, NULL, NULL);
 249
 250         // Set the _NET_WM_PID window property according to the EWMH spec. _NET_WM_PID
 251         // (in conjunction with WM_CLIENT_MACHINE) can be used by window managers to
 252         // force a shutdown of an application if it doesn't respond to the destroy
 253         // window message.
 254
 255         verbosestream << "Client: Setting Xorg _NET_WM_PID extended window manager property"
 256                 << std::endl;
 257
 258         Atom NET_WM_PID = XInternAtom(x11_dpl, "_NET_WM_PID", false);
 259
 260         pid_t pid = getpid();
 261
 262         XChangeProperty(x11_dpl, x11_win, NET_WM_PID,
 263                         XA_CARDINAL, 32, PropModeReplace,
 264                         reinterpret_cast<unsigned char *>(&pid),1);
 265
 266         // Set the WM_CLIENT_LEADER window property here. Minetest has only one
 267         // window and that window will always be the leader.
 268
 269         verbosestream << "Client: Setting Xorg WM_CLIENT_LEADER property"
 270                 << std::endl;
 271
 272         Atom WM_CLIENT_LEADER = XInternAtom(x11_dpl, "WM_CLIENT_LEADER", false);
 273
 274         XChangeProperty (x11_dpl, x11_win, WM_CLIENT_LEADER,
 275                 XA_WINDOW, 32, PropModeReplace,
 276                 reinterpret_cast<unsigned char *>(&x11_win), 1);
 277 #endif
 278 }
 279
 280 #ifdef _WIN32
 281 static bool getWindowHandle(irr::video::IVideoDriver *driver, HWND &hWnd)
 282 {
 283         const video::SExposedVideoData exposedData = driver->getExposedVideoData();
 284
 285         switch (driver->getDriverType()) {
 286 #if ENABLE_GLES
 287         case video::EDT_OGLES1:
 288         case video::EDT_OGLES2:
 289 #endif
 290         case video::EDT_OPENGL:
 291                 hWnd = reinterpret_cast<HWND>(exposedData.OpenGLWin32.HWnd);
 292                 break;
 293         default:
 294                 return false;
 295         }
 296
 297         return true;
 298 }
 299 #endif
 300
 301 bool RenderingEngine::setWindowIcon()
 302 {
 303 #if defined(XORG_USED)
 304 #if RUN_IN_PLACE
 305         return setXorgWindowIconFromPath(
 306                         porting::path_share + "/misc/dragonfire-xorg-icon-128.png");
 307 #else
 308         // We have semi-support for reading in-place data if we are
 309         // compiled with RUN_IN_PLACE. Don't break with this and
 310         // also try the path_share location.
 311         return setXorgWindowIconFromPath(
 312                                ICON_DIR "/hicolor/128x128/apps/dragonfire.png") ||
 313                setXorgWindowIconFromPath(porting::path_share + "/misc/dragonfire-xorg-icon-128.png");
 314 #endif
 315 #elif defined(_WIN32)
 316         HWND hWnd; // Window handle
 317         if (!getWindowHandle(driver, hWnd))
 318                 return false;
 319
 320         // Load the ICON from resource file
 321         const HICON hicon = LoadIcon(GetModuleHandle(NULL),
 322                         MAKEINTRESOURCE(130) // The ID of the ICON defined in
 323                                              // winresource.rc
 324         );
 325
 326         if (hicon) {
 327                 SendMessage(hWnd, WM_SETICON, ICON_BIG, reinterpret_cast<LPARAM>(hicon));
 328                 SendMessage(hWnd, WM_SETICON, ICON_SMALL,
 329                                 reinterpret_cast<LPARAM>(hicon));
 330                 return true;
 331         }
 332         return false;
 333 #else
 334         return false;
 335 #endif
 336 }
 337
 338 bool RenderingEngine::setXorgWindowIconFromPath(const std::string &icon_file)
 339 {
 340 #ifdef XORG_USED
 341
 342         video::IImageLoader *image_loader = NULL;
 343         u32 cnt = driver->getImageLoaderCount();
 344         for (u32 i = 0; i < cnt; i++) {
 345                 if (driver->getImageLoader(i)->isALoadableFileExtension(
 346                                     icon_file.c_str())) {
 347                         image_loader = driver->getImageLoader(i);
 348                         break;
 349                 }
 350         }
 351
 352         if (!image_loader) {
 353                 warningstream << "Could not find image loader for file '" << icon_file
 354                               << "'" << std::endl;
 355                 return false;
 356         }
 357
 358         io::IReadFile *icon_f =
 359                         m_device->getFileSystem()->createAndOpenFile(icon_file.c_str());
 360
 361         if (!icon_f) {
 362                 warningstream << "Could not load icon file '" << icon_file << "'"
 363                               << std::endl;
 364                 return false;
 365         }
 366
 367         video::IImage *img = image_loader->loadImage(icon_f);
 368
 369         if (!img) {
 370                 warningstream << "Could not load icon file '" << icon_file << "'"
 371                               << std::endl;
 372                 icon_f->drop();
 373                 return false;
 374         }
 375
 376         u32 height = img->getDimension().Height;
 377         u32 width = img->getDimension().Width;
 378
 379         size_t icon_buffer_len = 2 + height * width;
 380         long *icon_buffer = new long[icon_buffer_len];
 381
 382         icon_buffer[0] = width;
 383         icon_buffer[1] = height;
 384
 385         for (u32 x = 0; x < width; x++) {
 386                 for (u32 y = 0; y < height; y++) {
 387                         video::SColor col = img->getPixel(x, y);
 388                         long pixel_val = 0;
 389                         pixel_val |= (u8)col.getAlpha() << 24;
 390                         pixel_val |= (u8)col.getRed() << 16;
 391                         pixel_val |= (u8)col.getGreen() << 8;
 392                         pixel_val |= (u8)col.getBlue();
 393                         icon_buffer[2 + x + y * width] = pixel_val;
 394                 }
 395         }
 396
 397         img->drop();
 398         icon_f->drop();
 399
 400         const video::SExposedVideoData &video_data = driver->getExposedVideoData();
 401
 402         Display *x11_dpl = (Display *)video_data.OpenGLLinux.X11Display;
 403
 404         if (x11_dpl == NULL) {
 405                 warningstream << "Could not find x11 display for setting its icon."
 406                               << std::endl;
 407                 delete[] icon_buffer;
 408                 return false;
 409         }
 410
 411         Window x11_win = (Window)video_data.OpenGLLinux.X11Window;
 412
 413         Atom net_wm_icon = XInternAtom(x11_dpl, "_NET_WM_ICON", False);
 414         Atom cardinal = XInternAtom(x11_dpl, "CARDINAL", False);
 415         XChangeProperty(x11_dpl, x11_win, net_wm_icon, cardinal, 32, PropModeReplace,
 416                         (const unsigned char *)icon_buffer, icon_buffer_len);
 417
 418         delete[] icon_buffer;
 419
 420 #endif
 421         return true;
 422 }
 423
 424 /*
 425         Draws a screen with a single text on it.
 426         Text will be removed when the screen is drawn the next time.
 427         Additionally, a progressbar can be drawn when percent is set between 0 and 100.
 428 */
 429 void RenderingEngine::draw_load_screen(const std::wstring &text,
 430                 gui::IGUIEnvironment *guienv, ITextureSource *tsrc, float dtime,
 431                 int percent, bool clouds)
 432 {
 433         v2u32 screensize = getWindowSize();
 434
 435         v2s32 textsize(g_fontengine->getTextWidth(text), g_fontengine->getLineHeight());
 436         v2s32 center(screensize.X / 2, screensize.Y / 2);
 437         core::rect<s32> textrect(center - textsize / 2, center + textsize / 2);
 438
 439         gui::IGUIStaticText *guitext =
 440                         guienv->addStaticText(text.c_str(), textrect, false, false);
 441         guitext->setTextAlignment(gui::EGUIA_CENTER, gui::EGUIA_UPPERLEFT);
 442
 443         bool cloud_menu_background = clouds && g_settings->getBool("menu_clouds");
 444         if (cloud_menu_background) {
 445                 g_menuclouds->step(dtime * 3);
 446                 g_menuclouds->render();
 447                 get_video_driver()->beginScene(
 448                                 true, true, video::SColor(255, 140, 186, 250));
 449                 g_menucloudsmgr->drawAll();
 450         } else
 451                 get_video_driver()->beginScene(true, true, video::SColor(255, 0, 0, 0));
 452
 453         // draw progress bar
 454         if ((percent >= 0) && (percent <= 100)) {
 455                 video::ITexture *progress_img = tsrc->getTexture("progress_bar.png");
 456                 video::ITexture *progress_img_bg =
 457                                 tsrc->getTexture("progress_bar_bg.png");
 458
 459                 if (progress_img && progress_img_bg) {
 460 #ifndef __ANDROID__
 461                         const core::dimension2d<u32> &img_size =
 462                                         progress_img_bg->getSize();
 463                         u32 imgW = rangelim(img_size.Width, 200, 600);
 464                         u32 imgH = rangelim(img_size.Height, 24, 72);
 465 #else
 466                         const core::dimension2d<u32> img_size(256, 48);
 467                         float imgRatio = (float)img_size.Height / img_size.Width;
 468                         u32 imgW = screensize.X / 2.2f;
 469                         u32 imgH = floor(imgW * imgRatio);
 470 #endif
 471                         v2s32 img_pos((screensize.X - imgW) / 2,
 472                                         (screensize.Y - imgH) / 2);
 473
 474                         draw2DImageFilterScaled(get_video_driver(), progress_img_bg,
 475                                         core::rect<s32>(img_pos.X, img_pos.Y,
 476                                                         img_pos.X + imgW,
 477                                                         img_pos.Y + imgH),
 478                                         core::rect<s32>(0, 0, img_size.Width,
 479                                                         img_size.Height),
 480                                         0, 0, true);
 481
 482                         draw2DImageFilterScaled(get_video_driver(), progress_img,
 483                                         core::rect<s32>(img_pos.X, img_pos.Y,
 484                                                         img_pos.X + (percent * imgW) / 100,
 485                                                         img_pos.Y + imgH),
 486                                         core::rect<s32>(0, 0,
 487                                                         (percent * img_size.Width) / 100,
 488                                                         img_size.Height),
 489                                         0, 0, true);
 490                 }
 491         }
 492
 493         guienv->drawAll();
 494         get_video_driver()->endScene();
 495         guitext->remove();
 496 }
 497
 498 /*
 499         Draws the menu scene including (optional) cloud background.
 500 */
 501 void RenderingEngine::draw_menu_scene(gui::IGUIEnvironment *guienv,
 502                 float dtime, bool clouds)
 503 {
 504         bool cloud_menu_background = clouds && g_settings->getBool("menu_clouds");
 505         if (cloud_menu_background) {
 506                 g_menuclouds->step(dtime * 3);
 507                 g_menuclouds->render();
 508                 get_video_driver()->beginScene(
 509                                 true, true, video::SColor(255, 140, 186, 250));
 510                 g_menucloudsmgr->drawAll();
 511         } else
 512                 get_video_driver()->beginScene(true, true, video::SColor(255, 0, 0, 0));
 513
 514         guienv->drawAll();
 515         get_video_driver()->endScene();
 516 }
 517
 518 std::vector<irr::video::E_DRIVER_TYPE> RenderingEngine::getSupportedVideoDrivers()
 519 {
 520         // Only check these drivers.
 521         // We do not support software and D3D in any capacity.
 522         static const irr::video::E_DRIVER_TYPE glDrivers[4] = {
 523                 irr::video::EDT_NULL,
 524                 irr::video::EDT_OPENGL,
 525                 irr::video::EDT_OGLES1,
 526                 irr::video::EDT_OGLES2,
 527         };
 528         std::vector<irr::video::E_DRIVER_TYPE> drivers;
 529
 530         for (int i = 0; i < 4; i++) {
 531                 if (irr::IrrlichtDevice::isDriverSupported(glDrivers[i]))
 532                         drivers.push_back(glDrivers[i]);
 533         }
 534
 535         return drivers;
 536 }
 537
 538 void RenderingEngine::initialize(Client *client, Hud *hud)
 539 {
 540         const std::string &draw_mode = g_settings->get("3d_mode");
 541         core.reset(createRenderingCore(draw_mode, m_device, client, hud));
 542         core->initialize();
 543 }
 544
 545 void RenderingEngine::finalize()
 546 {
 547         core.reset();
 548 }
 549
 550 void RenderingEngine::draw_scene(video::SColor skycolor, bool show_hud,
 551                 bool show_minimap, bool draw_wield_tool, bool draw_crosshair)
 552 {
 553         core->draw(skycolor, show_hud, show_minimap, draw_wield_tool, draw_crosshair);
 554 }
 555
 556 const VideoDriverInfo &RenderingEngine::getVideoDriverInfo(irr::video::E_DRIVER_TYPE type)
 557 {
 558         static const std::unordered_map<int, VideoDriverInfo> driver_info_map = {
 559                 {(int)video::EDT_NULL,   {"null",   "NULL Driver"}},
 560                 {(int)video::EDT_OPENGL, {"opengl", "OpenGL"}},
 561                 {(int)video::EDT_OGLES1, {"ogles1", "OpenGL ES1"}},
 562                 {(int)video::EDT_OGLES2, {"ogles2", "OpenGL ES2"}},
 563         };
 564         return driver_info_map.at((int)type);
 565 }
 566
 567 #ifndef __ANDROID__
 568 #if defined(XORG_USED)
 569
 570 static float calcDisplayDensity()
 571 {
 572         const char *current_display = getenv("DISPLAY");
 573
 574         if (current_display != NULL) {
 575                 Display *x11display = XOpenDisplay(current_display);
 576
 577                 if (x11display != NULL) {
 578                         /* try x direct */
 579                         int dh = DisplayHeight(x11display, 0);
 580                         int dw = DisplayWidth(x11display, 0);
 581                         int dh_mm = DisplayHeightMM(x11display, 0);
 582                         int dw_mm = DisplayWidthMM(x11display, 0);
 583                         XCloseDisplay(x11display);
 584
 585                         if (dh_mm != 0 && dw_mm != 0) {
 586                                 float dpi_height = floor(dh / (dh_mm * 0.039370) + 0.5);
 587                                 float dpi_width = floor(dw / (dw_mm * 0.039370) + 0.5);
 588                                 return std::max(dpi_height, dpi_width) / 96.0;
 589                         }
 590                 }
 591         }
 592
 593         /* return manually specified dpi */
 594         return g_settings->getFloat("screen_dpi") / 96.0;
 595 }
 596
 597 float RenderingEngine::getDisplayDensity()
 598 {
 599         static float cached_display_density = calcDisplayDensity();
 600         return cached_display_density * g_settings->getFloat("display_density_factor");
 601 }
 602
 603 #elif defined(_WIN32)
 604
 605
 606 static float calcDisplayDensity(irr::video::IVideoDriver *driver)
 607 {
 608         HWND hWnd;
 609         if (getWindowHandle(driver, hWnd)) {
 610                 HDC hdc = GetDC(hWnd);
 611                 float dpi = GetDeviceCaps(hdc, LOGPIXELSX);
 612                 ReleaseDC(hWnd, hdc);
 613                 return dpi / 96.0f;
 614         }
 615
 616         /* return manually specified dpi */
 617         return g_settings->getFloat("screen_dpi") / 96.0f;
 618 }
 619
 620 float RenderingEngine::getDisplayDensity()
 621 {
 622         static bool cached = false;
 623         static float display_density;
 624         if (!cached) {
 625                 display_density = calcDisplayDensity(get_video_driver());
 626                 cached = true;
 627         }
 628         return display_density * g_settings->getFloat("display_density_factor");
 629 }
 630
 631 #else
 632
 633 float RenderingEngine::getDisplayDensity()
 634 {
 635         return (g_settings->getFloat("screen_dpi") / 96.0) * g_settings->getFloat("display_density_factor");
 636 }
 637
 638 #endif
 639
 640 #else // __ANDROID__
 641 float RenderingEngine::getDisplayDensity()
 642 {
 643         return porting::getDisplayDensity();
 644 }
 645
 646 #endif // __ANDROID__