+////
+//// Video/Display Information (Client-only)
+////
+
+#ifndef SERVER
+
+static irr::IrrlichtDevice *device;
+
+void initIrrlicht(irr::IrrlichtDevice *device_)
+{
+ device = device_;
+}
+
+v2u32 getWindowSize()
+{
+ return device->getVideoDriver()->getScreenSize();
+}
+
+
+std::vector<core::vector3d<u32> > getSupportedVideoModes()
+{
+ IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
+ sanity_check(nulldevice != NULL);
+
+ std::vector<core::vector3d<u32> > mlist;
+ video::IVideoModeList *modelist = nulldevice->getVideoModeList();
+
+ u32 num_modes = modelist->getVideoModeCount();
+ for (u32 i = 0; i != num_modes; i++) {
+ core::dimension2d<u32> mode_res = modelist->getVideoModeResolution(i);
+ s32 mode_depth = modelist->getVideoModeDepth(i);
+ mlist.push_back(core::vector3d<u32>(mode_res.Width, mode_res.Height, mode_depth));
+ }
+
+ nulldevice->drop();
+
+ return mlist;
+}
+
+std::vector<irr::video::E_DRIVER_TYPE> getSupportedVideoDrivers()
+{
+ std::vector<irr::video::E_DRIVER_TYPE> drivers;
+
+ for (int i = 0; i != irr::video::EDT_COUNT; i++) {
+ if (irr::IrrlichtDevice::isDriverSupported((irr::video::E_DRIVER_TYPE)i))
+ drivers.push_back((irr::video::E_DRIVER_TYPE)i);
+ }
+
+ return drivers;
+}
+
+const char *getVideoDriverName(irr::video::E_DRIVER_TYPE type)
+{
+ static const char *driver_ids[] = {
+ "null",
+ "software",
+ "burningsvideo",
+ "direct3d8",
+ "direct3d9",
+ "opengl",
+ "ogles1",
+ "ogles2",
+ };
+
+ return driver_ids[type];
+}
+
+
+const char *getVideoDriverFriendlyName(irr::video::E_DRIVER_TYPE type)
+{
+ static const char *driver_names[] = {
+ "NULL Driver",
+ "Software Renderer",
+ "Burning's Video",
+ "Direct3D 8",
+ "Direct3D 9",
+ "OpenGL",
+ "OpenGL ES1",
+ "OpenGL ES2",
+ };
+
+ return driver_names[type];
+}
+
+# ifndef __ANDROID__
+# ifdef XORG_USED
+
+static float calcDisplayDensity()
+{
+ const char *current_display = getenv("DISPLAY");
+
+ if (current_display != NULL) {
+ Display *x11display = XOpenDisplay(current_display);
+
+ if (x11display != NULL) {
+ /* try x direct */
+ float dpi_height = floor(DisplayHeight(x11display, 0) /
+ (DisplayHeightMM(x11display, 0) * 0.039370) + 0.5);
+ float dpi_width = floor(DisplayWidth(x11display, 0) /
+ (DisplayWidthMM(x11display, 0) * 0.039370) + 0.5);
+
+ XCloseDisplay(x11display);
+
+ return std::max(dpi_height,dpi_width) / 96.0;
+ }
+ }
+
+ /* return manually specified dpi */
+ return g_settings->getFloat("screen_dpi")/96.0;
+}
+
+
+float getDisplayDensity()
+{
+ static float cached_display_density = calcDisplayDensity();
+ return cached_display_density;
+}
+
+
+# else // XORG_USED
+float getDisplayDensity()
+{
+ return g_settings->getFloat("screen_dpi")/96.0;
+}
+# endif // XORG_USED
+
+v2u32 getDisplaySize()
+{
+ IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
+
+ core::dimension2d<u32> deskres = nulldevice->getVideoModeList()->getDesktopResolution();
+ nulldevice -> drop();
+
+ return deskres;
+}
+# endif // __ANDROID__
+#endif // SERVER
+
+
+////
+//// OS-specific Secure Random
+////
+
+#ifdef WIN32
+
+bool secure_rand_fill_buf(void *buf, size_t len)
+{
+ HCRYPTPROV wctx;
+
+ if (!CryptAcquireContext(&wctx, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
+ return false;
+
+ CryptGenRandom(wctx, len, (BYTE *)buf);
+ CryptReleaseContext(wctx, 0);
+ return true;
+}
+
+#else
+
+bool secure_rand_fill_buf(void *buf, size_t len)
+{
+ // N.B. This function checks *only* for /dev/urandom, because on most
+ // common OSes it is non-blocking, whereas /dev/random is blocking, and it
+ // is exceptionally uncommon for there to be a situation where /dev/random
+ // exists but /dev/urandom does not. This guesswork is necessary since
+ // random devices are not covered by any POSIX standard...
+ FILE *fp = fopen("/dev/urandom", "rb");
+ if (!fp)
+ return false;
+
+ bool success = fread(buf, len, 1, fp) == 1;
+
+ fclose(fp);
+ return success;
+}
+
+#endif
+
+} //namespace porting