Isolate irrlicht references and use a singleton (#6041)

* Add Device3D class which will contain IrrlichtDevice interface

move getSupportedVideoDrivers to Device3D

Add Device3D singleton & use it in various places

Rename Device3D to Rendering engine & add helper functions to various device pointers

More singleton work

RenderingEngine owns draw_load_screen

move draw functions to RenderingEngine

Reduce IrrlichtDevice exposure and guienvironment

RenderingEngine: Expose get_timer_time() to remove device from guiEngine

Make irrlichtdevice & scene manager less exposed

* Code style fixes

* Move porting::getVideoDriverName, getVideoDriverFriendlyName, getDisplayDensity, getDisplaySize to RenderingEngine

Fix XORG_USED macro -> RenderingEngine + create_engine_device from RenderingEngine constructor directly

* enum paralax => enum parallax

1 files changed, 1072 insertions, 0 deletions

diff --git a/src/client/renderingengine.cpp b/src/client/renderingengine.cpp
new file mode 100644
index 000000000..ce8f643b9
--- /dev/null
+++ b/src/client/renderingengine.cpp
@@ -0,0 +1,1072 @@
+/*
+Minetest
+Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <IrrlichtDevice.h>
+#include <irrlicht.h>
+#include "fontengine.h"
+#include "clouds.h"
+#include "util/numeric.h"
+#include "guiscalingfilter.h"
+#include "hud.h"
+#include "camera.h"
+#include "minimap.h"
+#include "clientmap.h"
+#include "renderingengine.h"
+#include "inputhandler.h"
+#include "gettext.h"
+
+#if !defined(_WIN32) && !defined(__APPLE__) && !defined(__ANDROID__) && !defined(SERVER)
+#define XORG_USED
+#endif
+#ifdef XORG_USED
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#endif
+
+RenderingEngine *RenderingEngine::s_singleton = nullptr;
+
+RenderingEngine::RenderingEngine(IEventReceiver *receiver)
+{
+	sanity_check(!s_singleton);
+
+	// Resolution selection
+	bool fullscreen = g_settings->getBool("fullscreen");
+	u16 screen_w = g_settings->getU16("screen_w");
+	u16 screen_h = g_settings->getU16("screen_h");
+
+	// bpp, fsaa, vsync
+	bool vsync = g_settings->getBool("vsync");
+	u16 bits = g_settings->getU16("fullscreen_bpp");
+	u16 fsaa = g_settings->getU16("fsaa");
+
+	// stereo buffer required for pageflip stereo
+	bool stereo_buffer = g_settings->get("3d_mode") == "pageflip";
+
+	// Determine driver
+	video::E_DRIVER_TYPE driverType = video::EDT_OPENGL;
+	const std::string &driverstring = g_settings->get("video_driver");
+	std::vector<video::E_DRIVER_TYPE> drivers =
+			RenderingEngine::getSupportedVideoDrivers();
+	u32 i;
+	for (i = 0; i != drivers.size(); i++) {
+		if (!strcasecmp(driverstring.c_str(),
+				    RenderingEngine::getVideoDriverName(drivers[i]))) {
+			driverType = drivers[i];
+			break;
+		}
+	}
+	if (i == drivers.size()) {
+		errorstream << "Invalid video_driver specified; "
+			       "defaulting to opengl"
+			    << std::endl;
+	}
+
+	SIrrlichtCreationParameters params = SIrrlichtCreationParameters();
+	params.DriverType = driverType;
+	params.WindowSize = core::dimension2d<u32>(screen_w, screen_h);
+	params.Bits = bits;
+	params.AntiAlias = fsaa;
+	params.Fullscreen = fullscreen;
+	params.Stencilbuffer = false;
+	params.Stereobuffer = stereo_buffer;
+	params.Vsync = vsync;
+	params.EventReceiver = receiver;
+	params.HighPrecisionFPU = g_settings->getBool("high_precision_fpu");
+	params.ZBufferBits = 24;
+#ifdef __ANDROID__
+	params.PrivateData = porting::app_global;
+	params.OGLES2ShaderPath = std::string(
+			porting::path_user + DIR_DELIM + "media" + DIR_DELIM + "Shaders" +
+			DIR_DELIM).c_str();
+#endif
+
+	m_device = createDeviceEx(params);
+	s_singleton = this;
+}
+
+RenderingEngine::~RenderingEngine()
+{
+	m_device->drop();
+	s_singleton = nullptr;
+}
+
+v2u32 RenderingEngine::getWindowSize() const
+{
+	return m_device->getVideoDriver()->getScreenSize();
+}
+
+void RenderingEngine::setResizable(bool resize)
+{
+	m_device->setResizable(resize);
+}
+
+video::IVideoDriver *RenderingEngine::getVideoDriver()
+{
+	return m_device->getVideoDriver();
+}
+
+bool RenderingEngine::print_video_modes()
+{
+	IrrlichtDevice *nulldevice;
+
+	bool vsync = g_settings->getBool("vsync");
+	u16 fsaa = g_settings->getU16("fsaa");
+	MyEventReceiver *receiver = new MyEventReceiver();
+
+	SIrrlichtCreationParameters params = SIrrlichtCreationParameters();
+	params.DriverType = video::EDT_NULL;
+	params.WindowSize = core::dimension2d<u32>(640, 480);
+	params.Bits = 24;
+	params.AntiAlias = fsaa;
+	params.Fullscreen = false;
+	params.Stencilbuffer = false;
+	params.Vsync = vsync;
+	params.EventReceiver = receiver;
+	params.HighPrecisionFPU = g_settings->getBool("high_precision_fpu");
+
+	nulldevice = createDeviceEx(params);
+
+	if (!nulldevice) {
+		delete receiver;
+		return false;
+	}
+
+	std::cout << _("Available video modes (WxHxD):") << std::endl;
+
+	video::IVideoModeList *videomode_list = nulldevice->getVideoModeList();
+
+	if (videomode_list != NULL) {
+		s32 videomode_count = videomode_list->getVideoModeCount();
+		core::dimension2d<u32> videomode_res;
+		s32 videomode_depth;
+		for (s32 i = 0; i < videomode_count; ++i) {
+			videomode_res = videomode_list->getVideoModeResolution(i);
+			videomode_depth = videomode_list->getVideoModeDepth(i);
+			std::cout << videomode_res.Width << "x" << videomode_res.Height
+				  << "x" << videomode_depth << std::endl;
+		}
+
+		std::cout << _("Active video mode (WxHxD):") << std::endl;
+		videomode_res = videomode_list->getDesktopResolution();
+		videomode_depth = videomode_list->getDesktopDepth();
+		std::cout << videomode_res.Width << "x" << videomode_res.Height << "x"
+			  << videomode_depth << std::endl;
+	}
+
+	nulldevice->drop();
+	delete receiver;
+
+	return videomode_list != NULL;
+}
+
+void RenderingEngine::setXorgClassHint(
+		const video::SExposedVideoData &video_data, const std::string &name)
+{
+#ifdef XORG_USED
+	if (video_data.OpenGLLinux.X11Display == NULL)
+		return;
+
+	XClassHint *classhint = XAllocClassHint();
+	classhint->res_name = (char *)name.c_str();
+	classhint->res_class = (char *)name.c_str();
+
+	XSetClassHint((Display *)video_data.OpenGLLinux.X11Display,
+			video_data.OpenGLLinux.X11Window, classhint);
+	XFree(classhint);
+#endif
+}
+
+bool RenderingEngine::setWindowIcon()
+{
+#if defined(XORG_USED)
+#if RUN_IN_PLACE
+	return setXorgWindowIconFromPath(
+			porting::path_share + "/misc/" PROJECT_NAME "-xorg-icon-128.png");
+#else
+	// We have semi-support for reading in-place data if we are
+	// compiled with RUN_IN_PLACE. Don't break with this and
+	// also try the path_share location.
+	return setXorgWindowIconFromPath(
+			       ICON_DIR "/hicolor/128x128/apps/" PROJECT_NAME ".png") ||
+	       setXorgWindowIconFromPath(porting::path_share + "/misc/" PROJECT_NAME
+							       "-xorg-icon-128.png");
+#endif
+#elif defined(_WIN32)
+	const video::SExposedVideoData exposedData =
+			m_device->getVideoDriver()->getExposedVideoData();
+	HWND hWnd; // Window handle
+
+	switch (m_device->getVideoDriver()->getDriverType()) {
+	case video::EDT_DIRECT3D8:
+		hWnd = reinterpret_cast<HWND>(exposedData.D3D8.HWnd);
+		break;
+	case video::EDT_DIRECT3D9:
+		hWnd = reinterpret_cast<HWND>(exposedData.D3D9.HWnd);
+		break;
+	case video::EDT_OPENGL:
+		hWnd = reinterpret_cast<HWND>(exposedData.OpenGLWin32.HWnd);
+		break;
+	default:
+		return false;
+	}
+
+	// Load the ICON from resource file
+	const HICON hicon = LoadIcon(GetModuleHandle(NULL),
+			MAKEINTRESOURCE(130) // The ID of the ICON defined in
+					     // winresource.rc
+			);
+
+	if (hicon) {
+		SendMessage(hWnd, WM_SETICON, ICON_BIG, reinterpret_cast<LPARAM>(hicon));
+		SendMessage(hWnd, WM_SETICON, ICON_SMALL,
+				reinterpret_cast<LPARAM>(hicon));
+		return true;
+	}
+	return false;
+#else
+	return false;
+#endif
+}
+
+bool RenderingEngine::setXorgWindowIconFromPath(const std::string &icon_file)
+{
+#ifdef XORG_USED
+
+	video::IVideoDriver *v_driver = m_device->getVideoDriver();
+
+	video::IImageLoader *image_loader = NULL;
+	u32 cnt = v_driver->getImageLoaderCount();
+	for (u32 i = 0; i < cnt; i++) {
+		if (v_driver->getImageLoader(i)->isALoadableFileExtension(
+				    icon_file.c_str())) {
+			image_loader = v_driver->getImageLoader(i);
+			break;
+		}
+	}
+
+	if (!image_loader) {
+		warningstream << "Could not find image loader for file '" << icon_file
+			      << "'" << std::endl;
+		return false;
+	}
+
+	io::IReadFile *icon_f =
+			m_device->getFileSystem()->createAndOpenFile(icon_file.c_str());
+
+	if (!icon_f) {
+		warningstream << "Could not load icon file '" << icon_file << "'"
+			      << std::endl;
+		return false;
+	}
+
+	video::IImage *img = image_loader->loadImage(icon_f);
+
+	if (!img) {
+		warningstream << "Could not load icon file '" << icon_file << "'"
+			      << std::endl;
+		icon_f->drop();
+		return false;
+	}
+
+	u32 height = img->getDimension().Height;
+	u32 width = img->getDimension().Width;
+
+	size_t icon_buffer_len = 2 + height * width;
+	long *icon_buffer = new long[icon_buffer_len];
+
+	icon_buffer[0] = width;
+	icon_buffer[1] = height;
+
+	for (u32 x = 0; x < width; x++) {
+		for (u32 y = 0; y < height; y++) {
+			video::SColor col = img->getPixel(x, y);
+			long pixel_val = 0;
+			pixel_val |= (u8)col.getAlpha() << 24;
+			pixel_val |= (u8)col.getRed() << 16;
+			pixel_val |= (u8)col.getGreen() << 8;
+			pixel_val |= (u8)col.getBlue();
+			icon_buffer[2 + x + y * width] = pixel_val;
+		}
+	}
+
+	img->drop();
+	icon_f->drop();
+
+	const video::SExposedVideoData &video_data = v_driver->getExposedVideoData();
+
+	Display *x11_dpl = (Display *)video_data.OpenGLLinux.X11Display;
+
+	if (x11_dpl == NULL) {
+		warningstream << "Could not find x11 display for setting its icon."
+			      << std::endl;
+		delete[] icon_buffer;
+		return false;
+	}
+
+	Window x11_win = (Window)video_data.OpenGLLinux.X11Window;
+
+	Atom net_wm_icon = XInternAtom(x11_dpl, "_NET_WM_ICON", False);
+	Atom cardinal = XInternAtom(x11_dpl, "CARDINAL", False);
+	XChangeProperty(x11_dpl, x11_win, net_wm_icon, cardinal, 32, PropModeReplace,
+			(const unsigned char *)icon_buffer, icon_buffer_len);
+
+	delete[] icon_buffer;
+
+#endif
+	return true;
+}
+
+/*
+	Draws a screen with a single text on it.
+	Text will be removed when the screen is drawn the next time.
+	Additionally, a progressbar can be drawn when percent is set between 0 and 100.
+*/
+void RenderingEngine::_draw_load_screen(const std::wstring &text,
+		gui::IGUIEnvironment *guienv, ITextureSource *tsrc, float dtime,
+		int percent, bool clouds)
+{
+	v2u32 screensize = RenderingEngine::get_instance()->getWindowSize();
+
+	v2s32 textsize(g_fontengine->getTextWidth(text), g_fontengine->getLineHeight());
+	v2s32 center(screensize.X / 2, screensize.Y / 2);
+	core::rect<s32> textrect(center - textsize / 2, center + textsize / 2);
+
+	gui::IGUIStaticText *guitext =
+			guienv->addStaticText(text.c_str(), textrect, false, false);
+	guitext->setTextAlignment(gui::EGUIA_CENTER, gui::EGUIA_UPPERLEFT);
+
+	bool cloud_menu_background = clouds && g_settings->getBool("menu_clouds");
+	if (cloud_menu_background) {
+		g_menuclouds->step(dtime * 3);
+		g_menuclouds->render();
+		get_video_driver()->beginScene(
+				true, true, video::SColor(255, 140, 186, 250));
+		g_menucloudsmgr->drawAll();
+	} else
+		get_video_driver()->beginScene(true, true, video::SColor(255, 0, 0, 0));
+
+	// draw progress bar
+	if ((percent >= 0) && (percent <= 100)) {
+		video::ITexture *progress_img = tsrc->getTexture("progress_bar.png");
+		video::ITexture *progress_img_bg =
+				tsrc->getTexture("progress_bar_bg.png");
+
+		if (progress_img && progress_img_bg) {
+#ifndef __ANDROID__
+			const core::dimension2d<u32> &img_size =
+					progress_img_bg->getSize();
+			u32 imgW = rangelim(img_size.Width, 200, 600);
+			u32 imgH = rangelim(img_size.Height, 24, 72);
+#else
+			const core::dimension2d<u32> img_size(256, 48);
+			float imgRatio = (float)img_size.Height / img_size.Width;
+			u32 imgW = screensize.X / 2.2f;
+			u32 imgH = floor(imgW * imgRatio);
+#endif
+			v2s32 img_pos((screensize.X - imgW) / 2,
+					(screensize.Y - imgH) / 2);
+
+			draw2DImageFilterScaled(get_video_driver(), progress_img_bg,
+					core::rect<s32>(img_pos.X, img_pos.Y,
+							img_pos.X + imgW,
+							img_pos.Y + imgH),
+					core::rect<s32>(0, 0, img_size.Width,
+							img_size.Height),
+					0, 0, true);
+
+			draw2DImageFilterScaled(get_video_driver(), progress_img,
+					core::rect<s32>(img_pos.X, img_pos.Y,
+							img_pos.X + (percent * imgW) / 100,
+							img_pos.Y + imgH),
+					core::rect<s32>(0, 0,
+							(percent * img_size.Width) / 100,
+							img_size.Height),
+					0, 0, true);
+		}
+	}
+
+	guienv->drawAll();
+	get_video_driver()->endScene();
+	guitext->remove();
+}
+
+std::vector<core::vector3d<u32>> RenderingEngine::getSupportedVideoModes()
+{
+	IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
+	sanity_check(nulldevice);
+
+	std::vector<core::vector3d<u32>> mlist;
+	video::IVideoModeList *modelist = nulldevice->getVideoModeList();
+
+	s32 num_modes = modelist->getVideoModeCount();
+	for (s32 i = 0; i != num_modes; i++) {
+		core::dimension2d<u32> mode_res = modelist->getVideoModeResolution(i);
+		u32 mode_depth = (u32)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> RenderingEngine::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;
+}
+
+void RenderingEngine::_draw_scene(Camera *camera, Client *client, LocalPlayer *player,
+		Hud *hud, Minimap *mapper, gui::IGUIEnvironment *guienv,
+		const v2u32 &screensize, const video::SColor &skycolor, bool show_hud,
+		bool show_minimap)
+{
+	bool draw_wield_tool =
+			(show_hud && (player->hud_flags & HUD_FLAG_WIELDITEM_VISIBLE) &&
+					camera->getCameraMode() < CAMERA_MODE_THIRD);
+
+	bool draw_crosshair = ((player->hud_flags & HUD_FLAG_CROSSHAIR_VISIBLE) &&
+			       (camera->getCameraMode() != CAMERA_MODE_THIRD_FRONT));
+
+#ifdef HAVE_TOUCHSCREENGUI
+	try {
+		draw_crosshair = !g_settings->getBool("touchtarget");
+	} catch (SettingNotFoundException) {
+	}
+#endif
+
+	const std::string &draw_mode = g_settings->get("3d_mode");
+
+	if (draw_mode == "anaglyph") {
+		draw_anaglyph_3d_mode(
+				camera, show_hud, hud, draw_wield_tool, client, guienv);
+		draw_crosshair = false;
+	} else if (draw_mode == "interlaced") {
+		draw_interlaced_3d_mode(camera, show_hud, hud, screensize,
+				draw_wield_tool, client, guienv, skycolor);
+		draw_crosshair = false;
+	} else if (draw_mode == "sidebyside") {
+		draw_sidebyside_3d_mode(camera, show_hud, hud, screensize,
+				draw_wield_tool, client, guienv, skycolor);
+		show_hud = false;
+	} else if (draw_mode == "topbottom") {
+		draw_top_bottom_3d_mode(camera, show_hud, hud, screensize,
+				draw_wield_tool, client, guienv, skycolor);
+		show_hud = false;
+	} else if (draw_mode == "pageflip") {
+		draw_pageflip_3d_mode(camera, show_hud, hud, screensize, draw_wield_tool,
+				client, guienv, skycolor);
+		draw_crosshair = false;
+		show_hud = false;
+	} else {
+		draw_plain(camera, show_hud, hud, screensize, draw_wield_tool, client,
+				guienv, skycolor);
+	}
+
+	/*
+		Post effects
+	*/
+	client->getEnv().getClientMap().renderPostFx(camera->getCameraMode());
+
+	// TODO how to make those 3d too
+	if (show_hud) {
+		if (draw_crosshair)
+			hud->drawCrosshair();
+
+		hud->drawHotbar(client->getPlayerItem());
+		hud->drawLuaElements(camera->getOffset());
+		camera->drawNametags();
+
+		if (mapper && show_minimap)
+			mapper->drawMinimap();
+	}
+
+	guienv->drawAll();
+}
+
+void RenderingEngine::draw_anaglyph_3d_mode(Camera *camera, bool show_hud, Hud *hud,
+		bool draw_wield_tool, Client *client, gui::IGUIEnvironment *guienv)
+{
+
+	/* preserve old setup*/
+	irr::core::vector3df oldPosition = camera->getCameraNode()->getPosition();
+	irr::core::vector3df oldTarget = camera->getCameraNode()->getTarget();
+
+	irr::core::matrix4 startMatrix =
+			camera->getCameraNode()->getAbsoluteTransformation();
+	irr::core::vector3df focusPoint =
+			(camera->getCameraNode()->getTarget() -
+					camera->getCameraNode()->getAbsolutePosition())
+					.setLength(1) +
+			camera->getCameraNode()->getAbsolutePosition();
+
+	// Left eye...
+	irr::core::vector3df leftEye;
+	irr::core::matrix4 leftMove;
+	leftMove.setTranslation(irr::core::vector3df(
+			-g_settings->getFloat("3d_paralax_strength"), 0.0f, 0.0f));
+	leftEye = (startMatrix * leftMove).getTranslation();
+
+	// clear the depth buffer, and color
+	getVideoDriver()->beginScene(true, true, irr::video::SColor(0, 200, 200, 255));
+	getVideoDriver()->getOverrideMaterial().Material.ColorMask = irr::video::ECP_RED;
+	getVideoDriver()->getOverrideMaterial().EnableFlags = irr::video::EMF_COLOR_MASK;
+	getVideoDriver()->getOverrideMaterial().EnablePasses =
+			irr::scene::ESNRP_SKY_BOX + irr::scene::ESNRP_SOLID +
+			irr::scene::ESNRP_TRANSPARENT +
+			irr::scene::ESNRP_TRANSPARENT_EFFECT + irr::scene::ESNRP_SHADOW;
+	camera->getCameraNode()->setPosition(leftEye);
+	camera->getCameraNode()->setTarget(focusPoint);
+	get_scene_manager()->drawAll();
+	getVideoDriver()->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+	if (show_hud) {
+		hud->drawSelectionMesh();
+		if (draw_wield_tool)
+			camera->drawWieldedTool(&leftMove);
+	}
+
+	guienv->drawAll();
+
+	// Right eye...
+	irr::core::vector3df rightEye;
+	irr::core::matrix4 rightMove;
+	rightMove.setTranslation(irr::core::vector3df(
+			g_settings->getFloat("3d_paralax_strength"), 0.0f, 0.0f));
+	rightEye = (startMatrix * rightMove).getTranslation();
+
+	// clear the depth buffer
+	getVideoDriver()->clearZBuffer();
+	getVideoDriver()->getOverrideMaterial().Material.ColorMask =
+			irr::video::ECP_GREEN + irr::video::ECP_BLUE;
+	getVideoDriver()->getOverrideMaterial().EnableFlags = irr::video::EMF_COLOR_MASK;
+	getVideoDriver()->getOverrideMaterial().EnablePasses =
+			irr::scene::ESNRP_SKY_BOX + irr::scene::ESNRP_SOLID +
+			irr::scene::ESNRP_TRANSPARENT +
+			irr::scene::ESNRP_TRANSPARENT_EFFECT + irr::scene::ESNRP_SHADOW;
+	camera->getCameraNode()->setPosition(rightEye);
+	camera->getCameraNode()->setTarget(focusPoint);
+	get_scene_manager()->drawAll();
+	getVideoDriver()->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+	if (show_hud) {
+		hud->drawSelectionMesh();
+		if (draw_wield_tool)
+			camera->drawWieldedTool(&rightMove);
+	}
+
+	guienv->drawAll();
+
+	getVideoDriver()->getOverrideMaterial().Material.ColorMask = irr::video::ECP_ALL;
+	getVideoDriver()->getOverrideMaterial().EnableFlags = 0;
+	getVideoDriver()->getOverrideMaterial().EnablePasses = 0;
+	camera->getCameraNode()->setPosition(oldPosition);
+	camera->getCameraNode()->setTarget(oldTarget);
+}
+
+void RenderingEngine::init_texture(
+		const v2u32 &screensize, video::ITexture **texture, const char *name)
+{
+	if (*texture) {
+		getVideoDriver()->removeTexture(*texture);
+	}
+	*texture = getVideoDriver()->addRenderTargetTexture(
+			core::dimension2d<u32>(screensize.X, screensize.Y), name,
+			irr::video::ECF_A8R8G8B8);
+}
+
+video::ITexture *RenderingEngine::draw_image(const v2u32 &screensize, parallax_sign psign,
+		const irr::core::matrix4 &startMatrix,
+		const irr::core::vector3df &focusPoint, bool show_hud, Camera *camera,
+		Hud *hud, bool draw_wield_tool, Client *client,
+		gui::IGUIEnvironment *guienv, const video::SColor &skycolor)
+{
+	static video::ITexture *images[2] = {NULL, NULL};
+	static v2u32 last_screensize = v2u32(0, 0);
+
+	video::ITexture *image = NULL;
+
+	if (screensize != last_screensize) {
+		init_texture(screensize, &images[1], "mt_drawimage_img1");
+		init_texture(screensize, &images[0], "mt_drawimage_img2");
+		last_screensize = screensize;
+	}
+
+	if (psign == RIGHT)
+		image = images[1];
+	else
+		image = images[0];
+
+	getVideoDriver()->setRenderTarget(image, true, true,
+			irr::video::SColor(255, skycolor.getRed(), skycolor.getGreen(),
+					skycolor.getBlue()));
+
+	irr::core::vector3df eye_pos;
+	irr::core::matrix4 movement;
+	movement.setTranslation(irr::core::vector3df(
+			(int)psign * g_settings->getFloat("3d_paralax_strength"), 0.0f,
+			0.0f));
+	eye_pos = (startMatrix * movement).getTranslation();
+
+	// clear the depth buffer
+	getVideoDriver()->clearZBuffer();
+	camera->getCameraNode()->setPosition(eye_pos);
+	camera->getCameraNode()->setTarget(focusPoint);
+	get_scene_manager()->drawAll();
+
+	getVideoDriver()->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+
+	if (show_hud) {
+		hud->drawSelectionMesh();
+		if (draw_wield_tool)
+			camera->drawWieldedTool(&movement);
+	}
+
+	guienv->drawAll();
+
+	/* switch back to real renderer */
+	getVideoDriver()->setRenderTarget(0, true, true,
+			irr::video::SColor(0, skycolor.getRed(), skycolor.getGreen(),
+					skycolor.getBlue()));
+
+	return image;
+}
+
+video::ITexture *RenderingEngine::draw_hud(const v2u32 &screensize, bool show_hud,
+		Hud *hud, Client *client, bool draw_crosshair,
+		const video::SColor &skycolor, gui::IGUIEnvironment *guienv,
+		Camera *camera)
+{
+	static video::ITexture *image = nullptr;
+	init_texture(screensize, &image, "mt_drawimage_hud");
+	getVideoDriver()->setRenderTarget(
+			image, true, true, irr::video::SColor(255, 0, 0, 0));
+
+	if (show_hud) {
+		if (draw_crosshair)
+			hud->drawCrosshair();
+		hud->drawHotbar(client->getPlayerItem());
+		hud->drawLuaElements(camera->getOffset());
+		camera->drawNametags();
+		guienv->drawAll();
+	}
+
+	getVideoDriver()->setRenderTarget(0, true, true,
+			irr::video::SColor(0, skycolor.getRed(), skycolor.getGreen(),
+					skycolor.getBlue()));
+
+	return image;
+}
+
+void RenderingEngine::draw_interlaced_3d_mode(Camera *camera, bool show_hud, Hud *hud,
+		const v2u32 &screensize, bool draw_wield_tool, Client *client,
+		gui::IGUIEnvironment *guienv, const video::SColor &skycolor)
+{
+	/* save current info */
+	irr::core::vector3df oldPosition = camera->getCameraNode()->getPosition();
+	irr::core::vector3df oldTarget = camera->getCameraNode()->getTarget();
+	irr::core::matrix4 startMatrix =
+			camera->getCameraNode()->getAbsoluteTransformation();
+	irr::core::vector3df focusPoint =
+			(camera->getCameraNode()->getTarget() -
+					camera->getCameraNode()->getAbsolutePosition())
+					.setLength(1) +
+			camera->getCameraNode()->getAbsolutePosition();
+
+	/* create left view */
+	video::ITexture *left_image = draw_image(screensize, LEFT, startMatrix,
+			focusPoint, show_hud, camera, hud, draw_wield_tool, client,
+			guienv, skycolor);
+
+	// Right eye...
+	irr::core::vector3df rightEye;
+	irr::core::matrix4 rightMove;
+	rightMove.setTranslation(irr::core::vector3df(
+			g_settings->getFloat("3d_paralax_strength"), 0.0f, 0.0f));
+	rightEye = (startMatrix * rightMove).getTranslation();
+
+	// clear the depth buffer
+	getVideoDriver()->clearZBuffer();
+	camera->getCameraNode()->setPosition(rightEye);
+	camera->getCameraNode()->setTarget(focusPoint);
+	get_scene_manager()->drawAll();
+
+	getVideoDriver()->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+
+	if (show_hud) {
+		hud->drawSelectionMesh();
+		if (draw_wield_tool)
+			camera->drawWieldedTool(&rightMove);
+	}
+	guienv->drawAll();
+
+	for (unsigned int i = 0; i < screensize.Y; i += 2) {
+#if (IRRLICHT_VERSION_MAJOR >= 1) && (IRRLICHT_VERSION_MINOR >= 8)
+		getVideoDriver()->draw2DImage(left_image,
+				irr::core::position2d<s32>(0, i),
+#else
+		getVideoDriver()->draw2DImage(left_image,
+				irr::core::position2d<s32>(0, screensize.Y - i),
+#endif
+				irr::core::rect<s32>(0, i, screensize.X, i + 1), 0,
+				irr::video::SColor(255, 255, 255, 255), false);
+	}
+
+	/* cleanup */
+	camera->getCameraNode()->setPosition(oldPosition);
+	camera->getCameraNode()->setTarget(oldTarget);
+}
+
+void RenderingEngine::draw_sidebyside_3d_mode(Camera *camera, bool show_hud, Hud *hud,
+		const v2u32 &screensize, bool draw_wield_tool, Client *client,
+		gui::IGUIEnvironment *guienv, const video::SColor &skycolor)
+{
+	/* save current info */
+	irr::core::vector3df oldPosition = camera->getCameraNode()->getPosition();
+	irr::core::vector3df oldTarget = camera->getCameraNode()->getTarget();
+	irr::core::matrix4 startMatrix =
+			camera->getCameraNode()->getAbsoluteTransformation();
+	irr::core::vector3df focusPoint =
+			(camera->getCameraNode()->getTarget() -
+					camera->getCameraNode()->getAbsolutePosition())
+					.setLength(1) +
+			camera->getCameraNode()->getAbsolutePosition();
+
+	/* create left view */
+	video::ITexture *left_image = draw_image(screensize, LEFT, startMatrix,
+			focusPoint, show_hud, camera, hud, draw_wield_tool, client,
+			guienv, skycolor);
+
+	/* create right view */
+	video::ITexture *right_image = draw_image(screensize, RIGHT, startMatrix,
+			focusPoint, show_hud, camera, hud, draw_wield_tool, client,
+			guienv, skycolor);
+
+	/* create hud overlay */
+	video::ITexture *hudtexture = draw_hud(screensize, show_hud, hud, client, false,
+			skycolor, guienv, camera);
+	getVideoDriver()->makeColorKeyTexture(
+			hudtexture, irr::video::SColor(255, 0, 0, 0));
+	// makeColorKeyTexture mirrors texture so we do it twice to get it right again
+	getVideoDriver()->makeColorKeyTexture(
+			hudtexture, irr::video::SColor(255, 0, 0, 0));
+
+	draw2DImageFilterScaled(getVideoDriver(), left_image,
+			irr::core::rect<s32>(0, 0, screensize.X / 2, screensize.Y),
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y), 0, 0,
+			false);
+
+	draw2DImageFilterScaled(getVideoDriver(), hudtexture,
+			irr::core::rect<s32>(0, 0, screensize.X / 2, screensize.Y),
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y), 0, 0,
+			true);
+
+	draw2DImageFilterScaled(getVideoDriver(), right_image,
+			irr::core::rect<s32>(
+					screensize.X / 2, 0, screensize.X, screensize.Y),
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y), 0, 0,
+			false);
+
+	draw2DImageFilterScaled(getVideoDriver(), hudtexture,
+			irr::core::rect<s32>(
+					screensize.X / 2, 0, screensize.X, screensize.Y),
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y), 0, 0,
+			true);
+
+	left_image = nullptr;
+	right_image = nullptr;
+
+	/* cleanup */
+	camera->getCameraNode()->setPosition(oldPosition);
+	camera->getCameraNode()->setTarget(oldTarget);
+}
+
+void RenderingEngine::draw_top_bottom_3d_mode(Camera *camera, bool show_hud, Hud *hud,
+		const v2u32 &screensize, bool draw_wield_tool, Client *client,
+		gui::IGUIEnvironment *guienv, const video::SColor &skycolor)
+{
+	/* save current info */
+	irr::core::vector3df oldPosition = camera->getCameraNode()->getPosition();
+	irr::core::vector3df oldTarget = camera->getCameraNode()->getTarget();
+	irr::core::matrix4 startMatrix =
+			camera->getCameraNode()->getAbsoluteTransformation();
+	irr::core::vector3df focusPoint =
+			(camera->getCameraNode()->getTarget() -
+					camera->getCameraNode()->getAbsolutePosition())
+					.setLength(1) +
+			camera->getCameraNode()->getAbsolutePosition();
+
+	/* create left view */
+	video::ITexture *left_image = draw_image(screensize, LEFT, startMatrix,
+			focusPoint, show_hud, camera, hud, draw_wield_tool, client,
+			guienv, skycolor);
+
+	/* create right view */
+	video::ITexture *right_image = draw_image(screensize, RIGHT, startMatrix,
+			focusPoint, show_hud, camera, hud, draw_wield_tool, client,
+			guienv, skycolor);
+
+	/* create hud overlay */
+	video::ITexture *hudtexture = draw_hud(screensize, show_hud, hud, client, false,
+			skycolor, guienv, camera);
+	getVideoDriver()->makeColorKeyTexture(
+			hudtexture, irr::video::SColor(255, 0, 0, 0));
+	// makeColorKeyTexture mirrors texture so we do it twice to get it right again
+	getVideoDriver()->makeColorKeyTexture(
+			hudtexture, irr::video::SColor(255, 0, 0, 0));
+
+	draw2DImageFilterScaled(getVideoDriver(), left_image,
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y / 2),
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y), 0, 0,
+			false);
+
+	draw2DImageFilterScaled(getVideoDriver(), hudtexture,
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y / 2),
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y), 0, 0,
+			true);
+
+	draw2DImageFilterScaled(getVideoDriver(), right_image,
+			irr::core::rect<s32>(
+					0, screensize.Y / 2, screensize.X, screensize.Y),
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y), 0, 0,
+			false);
+
+	draw2DImageFilterScaled(getVideoDriver(), hudtexture,
+			irr::core::rect<s32>(
+					0, screensize.Y / 2, screensize.X, screensize.Y),
+			irr::core::rect<s32>(0, 0, screensize.X, screensize.Y), 0, 0,
+			true);
+
+	left_image = NULL;
+	right_image = NULL;
+
+	/* cleanup */
+	camera->getCameraNode()->setPosition(oldPosition);
+	camera->getCameraNode()->setTarget(oldTarget);
+}
+
+void RenderingEngine::draw_pageflip_3d_mode(Camera *camera, bool show_hud, Hud *hud,
+		const v2u32 &screensize, bool draw_wield_tool, Client *client,
+		gui::IGUIEnvironment *guienv, const video::SColor &skycolor)
+{
+#if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR > 8
+	errorstream << "Pageflip 3D mode is not supported"
+		    << " with your Irrlicht version!" << std::endl;
+#else
+	/* preserve old setup*/
+	irr::core::vector3df oldPosition = camera->getCameraNode()->getPosition();
+	irr::core::vector3df oldTarget = camera->getCameraNode()->getTarget();
+
+	irr::core::matrix4 startMatrix =
+			camera->getCameraNode()->getAbsoluteTransformation();
+	irr::core::vector3df focusPoint =
+			(camera->getCameraNode()->getTarget() -
+					camera->getCameraNode()->getAbsolutePosition())
+					.setLength(1) +
+			camera->getCameraNode()->getAbsolutePosition();
+
+	// Left eye...
+	getVideoDriver()->setRenderTarget(irr::video::ERT_STEREO_LEFT_BUFFER);
+
+	irr::core::vector3df leftEye;
+	irr::core::matrix4 leftMove;
+	leftMove.setTranslation(irr::core::vector3df(
+			-g_settings->getFloat("3d_paralax_strength"), 0.0f, 0.0f));
+	leftEye = (startMatrix * leftMove).getTranslation();
+
+	// clear the depth buffer, and color
+	getVideoDriver()->beginScene(true, true, irr::video::SColor(200, 200, 200, 255));
+	camera->getCameraNode()->setPosition(leftEye);
+	camera->getCameraNode()->setTarget(focusPoint);
+	get_scene_manager()->drawAll();
+	getVideoDriver()->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+
+	if (show_hud) {
+		hud->drawSelectionMesh();
+		if (draw_wield_tool)
+			camera->drawWieldedTool(&leftMove);
+		hud->drawHotbar(client->getPlayerItem());
+		hud->drawLuaElements(camera->getOffset());
+		camera->drawNametags();
+	}
+
+	guienv->drawAll();
+
+	// Right eye...
+	getVideoDriver()->setRenderTarget(irr::video::ERT_STEREO_RIGHT_BUFFER);
+
+	irr::core::vector3df rightEye;
+	irr::core::matrix4 rightMove;
+	rightMove.setTranslation(irr::core::vector3df(
+			g_settings->getFloat("3d_paralax_strength"), 0.0f, 0.0f));
+	rightEye = (startMatrix * rightMove).getTranslation();
+
+	// clear the depth buffer, and color
+	getVideoDriver()->beginScene(true, true, irr::video::SColor(200, 200, 200, 255));
+	camera->getCameraNode()->setPosition(rightEye);
+	camera->getCameraNode()->setTarget(focusPoint);
+	get_scene_manager()->drawAll();
+	getVideoDriver()->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+
+	if (show_hud) {
+		hud->drawSelectionMesh();
+		if (draw_wield_tool)
+			camera->drawWieldedTool(&rightMove);
+		hud->drawHotbar(client->getPlayerItem());
+		hud->drawLuaElements(camera->getOffset());
+		camera->drawNametags();
+	}
+
+	guienv->drawAll();
+
+	camera->getCameraNode()->setPosition(oldPosition);
+	camera->getCameraNode()->setTarget(oldTarget);
+#endif
+}
+
+// returns (size / coef), rounded upwards
+inline int scaledown(int coef, int size)
+{
+	return (size + coef - 1) / coef;
+}
+
+void RenderingEngine::draw_plain(Camera *camera, bool show_hud, Hud *hud,
+		const v2u32 &screensize, bool draw_wield_tool, Client *client,
+		gui::IGUIEnvironment *guienv, const video::SColor &skycolor)
+{
+	// Undersampling-specific stuff
+	static video::ITexture *image = NULL;
+	static v2u32 last_pixelated_size = v2u32(0, 0);
+	static thread_local int undersampling = g_settings->getU16("undersampling");
+	v2u32 pixelated_size;
+	v2u32 dest_size;
+	if (undersampling > 0) {
+		pixelated_size = v2u32(scaledown(undersampling, screensize.X),
+				scaledown(undersampling, screensize.Y));
+		dest_size = v2u32(undersampling * pixelated_size.X,
+				undersampling * pixelated_size.Y);
+		if (pixelated_size != last_pixelated_size) {
+			init_texture(pixelated_size, &image, "mt_drawimage_img1");
+			last_pixelated_size = pixelated_size;
+		}
+		getVideoDriver()->setRenderTarget(image, true, true, skycolor);
+	}
+
+	// Render
+	get_scene_manager()->drawAll();
+	getVideoDriver()->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+	if (show_hud) {
+		hud->drawSelectionMesh();
+		if (draw_wield_tool) {
+			camera->drawWieldedTool();
+		}
+	}
+
+	// Upscale lowres render
+	if (undersampling > 0) {
+		getVideoDriver()->setRenderTarget(0, true, true);
+		getVideoDriver()->draw2DImage(image,
+				irr::core::rect<s32>(0, 0, dest_size.X, dest_size.Y),
+				irr::core::rect<s32>(0, 0, pixelated_size.X,
+						pixelated_size.Y));
+	}
+}
+
+const char *RenderingEngine::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 *RenderingEngine::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 RenderingEngine::getDisplayDensity()
+{
+	static float cached_display_density = calcDisplayDensity();
+	return cached_display_density;
+}
+
+#else  // XORG_USED
+float RenderingEngine::getDisplayDensity()
+{
+	return g_settings->getFloat("screen_dpi") / 96.0;
+}
+#endif // XORG_USED
+
+v2u32 RenderingEngine::getDisplaySize()
+{
+	IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
+
+	core::dimension2d<u32> deskres =
+			nulldevice->getVideoModeList()->getDesktopResolution();
+	nulldevice->drop();
+
+	return deskres;
+}
+#endif // __ANDROID__