path: root/src/nodedef.cpp

/*
Minetest-c55
Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.

You should have received a copy of the GNU 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 "nodedef.h"

#include "main.h" // For g_settings
#include "itemdef.h"
#ifndef SERVER
#include "tile.h"
#endif
#include "log.h"
#include "settings.h"
#include "nameidmapping.h"

/*
	NodeBox
*/

void NodeBox::serialize(std::ostream &os) const
{
	writeU8(os, 0); // version
	writeU8(os, type);
	writeV3F1000(os, fixed.MinEdge);
	writeV3F1000(os, fixed.MaxEdge);
	writeV3F1000(os, wall_top.MinEdge);
	writeV3F1000(os, wall_top.MaxEdge);
	writeV3F1000(os, wall_bottom.MinEdge);
	writeV3F1000(os, wall_bottom.MaxEdge);
	writeV3F1000(os, wall_side.MinEdge);
	writeV3F1000(os, wall_side.MaxEdge);
}

void NodeBox::deSerialize(std::istream &is)
{
	int version = readU8(is);
	if(version != 0)
		throw SerializationError("unsupported NodeBox version");
	type = (enum NodeBoxType)readU8(is);
	fixed.MinEdge = readV3F1000(is);
	fixed.MaxEdge = readV3F1000(is);
	wall_top.MinEdge = readV3F1000(is);
	wall_top.MaxEdge = readV3F1000(is);
	wall_bottom.MinEdge = readV3F1000(is);
	wall_bottom.MaxEdge = readV3F1000(is);
	wall_side.MinEdge = readV3F1000(is);
	wall_side.MaxEdge = readV3F1000(is);
}

/*
	MaterialSpec
*/

void MaterialSpec::serialize(std::ostream &os) const
{
	os<<serializeString(tname);
	writeU8(os, backface_culling);
}

void MaterialSpec::deSerialize(std::istream &is)
{
	tname = deSerializeString(is);
	backface_culling = readU8(is);
}

/*
	SimpleSoundSpec serialization
*/

static void serializeSimpleSoundSpec(const SimpleSoundSpec &ss,
		std::ostream &os)
{
	os<<serializeString(ss.name);
	writeF1000(os, ss.gain);
}
static void deSerializeSimpleSoundSpec(SimpleSoundSpec &ss, std::istream &is)
{
	ss.name = deSerializeString(is);
	ss.gain = readF1000(is);
}

/*
	ContentFeatures
*/

ContentFeatures::ContentFeatures()
{
	reset();
}

ContentFeatures::~ContentFeatures()
{
}

void ContentFeatures::reset()
{
	/*
		Cached stuff
	*/
#ifndef SERVER
	solidness = 2;
	visual_solidness = 0;
	backface_culling = true;
#endif
	/*
		Actual data
		
		NOTE: Most of this is always overridden by the default values given
		      in builtin.lua
	*/
	name = "";
	groups.clear();
	// Unknown nodes can be dug
	groups["dig_immediate"] = 2;
	drawtype = NDT_NORMAL;
	visual_scale = 1.0;
	for(u32 i=0; i<6; i++)
		tname_tiles[i] = "";
	for(u16 j=0; j<CF_SPECIAL_COUNT; j++)
		mspec_special[j] = MaterialSpec();
	alpha = 255;
	post_effect_color = video::SColor(0, 0, 0, 0);
	param_type = CPT_NONE;
	param_type_2 = CPT2_NONE;
	is_ground_content = false;
	light_propagates = false;
	sunlight_propagates = false;
	walkable = true;
	pointable = true;
	diggable = true;
	climbable = false;
	buildable_to = false;
	metadata_name = "";
	liquid_type = LIQUID_NONE;
	liquid_alternative_flowing = "";
	liquid_alternative_source = "";
	liquid_viscosity = 0;
	light_source = 0;
	damage_per_second = 0;
	selection_box = NodeBox();
	legacy_facedir_simple = false;
	legacy_wallmounted = false;
	sound_footstep = SimpleSoundSpec();
	sound_dug = SimpleSoundSpec();
}

void ContentFeatures::serialize(std::ostream &os)
{
	writeU8(os, 2); // version
	os<<serializeString(name);
	writeU16(os, groups.size());
	for(ItemGroupList::const_iterator
			i = groups.begin(); i != groups.end(); i++){
		os<<serializeString(i->first);
		writeS16(os, i->second);
	}
	writeU8(os, drawtype);
	writeF1000(os, visual_scale);
	writeU8(os, 6);
	for(u32 i=0; i<6; i++)
		os<<serializeString(tname_tiles[i]);
	writeU8(os, CF_SPECIAL_COUNT);
	for(u32 i=0; i<CF_SPECIAL_COUNT; i++){
		mspec_special[i].serialize(os);
	}
	writeU8(os, alpha);
	writeU8(os, post_effect_color.getAlpha());
	writeU8(os, post_effect_color.getRed());
	writeU8(os, post_effect_color.getGreen());
	writeU8(os, post_effect_color.getBlue());
	writeU8(os, param_type);
	writeU8(os, param_type_2);
	writeU8(os, is_ground_content);
	writeU8(os, light_propagates);
	writeU8(os, sunlight_propagates);
	writeU8(os, walkable);
	writeU8(os, pointable);
	writeU8(os, diggable);
	writeU8(os, climbable);
	writeU8(os, buildable_to);
	os<<serializeString(metadata_name);
	writeU8(os, liquid_type);
	os<<serializeString(liquid_alternative_flowing);
	os<<serializeString(liquid_alternative_source);
	writeU8(os, liquid_viscosity);
	writeU8(os, light_source);
	writeU32(os, damage_per_second);
	selection_box.serialize(os);
	writeU8(os, legacy_facedir_simple);
	writeU8(os, legacy_wallmounted);
	serializeSimpleSoundSpec(sound_footstep, os);
	serializeSimpleSoundSpec(sound_dug, os);
}

void ContentFeatures::deSerialize(std::istream &is)
{
	int version = readU8(is);
	if(version != 2)
		throw SerializationError("unsupported ContentFeatures version");
	name = deSerializeString(is);
	groups.clear();
	u32 groups_size = readU16(is);
	for(u32 i=0; i<groups_size; i++){
		std::string name = deSerializeString(is);
		int value = readS16(is);
		groups[name] = value;
	}
	drawtype = (enum NodeDrawType)readU8(is);
	visual_scale = readF1000(is);
	if(readU8(is) != 6)
		throw SerializationError("unsupported tile count");
	for(u32 i=0; i<6; i++)
		tname_tiles[i] = deSerializeString(is);
	if(readU8(is) != CF_SPECIAL_COUNT)
		throw SerializationError("unsupported CF_SPECIAL_COUNT");
	for(u32 i=0; i<CF_SPECIAL_COUNT; i++){
		mspec_special[i].deSerialize(is);
	}
	alpha = readU8(is);
	post_effect_color.setAlpha(readU8(is));
	post_effect_color.setRed(readU8(is));
	post_effect_color.setGreen(readU8(is));
	post_effect_color.setBlue(readU8(is));
	param_type = (enum ContentParamType)readU8(is);
	param_type_2 = (enum ContentParamType2)readU8(is);
	is_ground_content = readU8(is);
	light_propagates = readU8(is);
	sunlight_propagates = readU8(is);
	walkable = readU8(is);
	pointable = readU8(is);
	diggable = readU8(is);
	climbable = readU8(is);
	buildable_to = readU8(is);
	metadata_name = deSerializeString(is);
	liquid_type = (enum LiquidType)readU8(is);
	liquid_alternative_flowing = deSerializeString(is);
	liquid_alternative_source = deSerializeString(is);
	liquid_viscosity = readU8(is);
	light_source = readU8(is);
	damage_per_second = readU32(is);
	selection_box.deSerialize(is);
	legacy_facedir_simple = readU8(is);
	legacy_wallmounted = readU8(is);
	try{
		deSerializeSimpleSoundSpec(sound_footstep, is);
		deSerializeSimpleSoundSpec(sound_dug, is);
	}catch(SerializationError &e) {};
}

/*
	CNodeDefManager
*/

class CNodeDefManager: public IWritableNodeDefManager
{
public:
	void clear()
	{
		m_name_id_mapping.clear();
		m_name_id_mapping_with_aliases.clear();

		for(u16 i=0; i<=MAX_CONTENT; i++)
		{
			ContentFeatures &f = m_content_features[i];
			f.reset(); // Reset to defaults
		}
		
		// Set CONTENT_AIR
		{
			ContentFeatures f;
			f.name = "air";
			f.drawtype = NDT_AIRLIKE;
			f.param_type = CPT_LIGHT;
			f.light_propagates = true;
			f.sunlight_propagates = true;
			f.walkable = false;
			f.pointable = false;
			f.diggable = false;
			f.buildable_to = true;
			// Insert directly into containers
			content_t c = CONTENT_AIR;
			m_content_features[c] = f;
			addNameIdMapping(c, f.name);
		}
		// Set CONTENT_IGNORE
		{
			ContentFeatures f;
			f.name = "ignore";
			f.drawtype = NDT_AIRLIKE;
			f.param_type = CPT_NONE;
			f.light_propagates = false;
			f.sunlight_propagates = false;
			f.walkable = false;
			f.pointable = false;
			f.diggable = false;
			// A way to remove accidental CONTENT_IGNOREs
			f.buildable_to = true;
			// Insert directly into containers
			content_t c = CONTENT_IGNORE;
			m_content_features[c] = f;
			addNameIdMapping(c, f.name);
		}
	}
	// CONTENT_IGNORE = not found
	content_t getFreeId(bool require_full_param2)
	{
		// If allowed, first search in the large 4-bit-param2 pool
		if(!require_full_param2){
			for(u16 i=0x800; i<=0xfff; i++){
				const ContentFeatures &f = m_content_features[i];
				if(f.name == "")
					return i;
			}
		}	if (strlcpy(buf, exec, len) >= len)
		return false;

	return true;
}


// HP-UX
#elif defined(__hpux)

bool getCurrentExecPath(char *buf, size_t len)
{
	struct pst_status psts;

	if (pstat_getproc(&psts, sizeof(psts), 0, getpid()) == -1)
		return false;

	if (pstat_getpathname(buf, len, &psts.pst_fid_text) == -1)
		return false;

	return true;
}


#else

bool getCurrentExecPath(char *buf, size_t len)
{
	return false;
}

#endif


//// Windows
#if defined(_WIN32)

bool setSystemPaths()
{
	char buf[BUFSIZ];

	// Find path of executable and set path_share relative to it
	FATAL_ERROR_IF(!getCurrentExecPath(buf, sizeof(buf)),
		"Failed to get current executable path");
	pathRemoveFile(buf, '\\');

	// Use ".\bin\.."
	path_share = std::string(buf) + "\\..";

	// Use "C:\Documents and Settings\user\Application Data\<PROJECT_NAME>"
	DWORD len = GetEnvironmentVariable("APPDATA", buf, sizeof(buf));
	FATAL_ERROR_IF(len == 0 || len > sizeof(buf), "Failed to get APPDATA");

	path_user = std::string(buf) + DIR_DELIM + PROJECT_NAME;
	return true;
}


//// Linux
#elif defined(__linux__)

bool setSystemPaths()
{
	char buf[BUFSIZ];

	if (!getCurrentExecPath(buf, sizeof(buf))) {
#ifdef __ANDROID__
		errorstream << "Unable to read bindir "<< std::endl;
#else
		FATAL_ERROR("Unable to read bindir");
#endif
		return false;
	}

	pathRemoveFile(buf, '/');
	std::string bindir(buf);

	// Find share directory from these.
	// It is identified by containing the subdirectory "builtin".
	std::list<std::string> trylist;
	std::string static_sharedir = STATIC_SHAREDIR;
	if (static_sharedir != "" && static_sharedir != ".")
		trylist.push_back(static_sharedir);

	trylist.push_back(bindir + DIR_DELIM ".." DIR_DELIM "share"
		DIR_DELIM + PROJECT_NAME);
	trylist.push_back(bindir + DIR_DELIM "..");

#ifdef __ANDROID__
	trylist.push_back(path_user);
#endif

	for (std::list<std::string>::const_iterator
			i = trylist.begin(); i != trylist.end(); ++i) {
		const std::string &trypath = *i;
		if (!fs::PathExists(trypath) ||
			!fs::PathExists(trypath + DIR_DELIM + "builtin")) {
			warningstream << "system-wide share not found at \""
					<< trypath << "\""<< std::endl;
			continue;
		}

		// Warn if was not the first alternative
		if (i != trylist.begin()) {
			warningstream << "system-wide share found at \""
					<< trypath << "\"" << std::endl;
		}

		path_share = trypath;
		break;
	}

#ifndef __ANDROID__
	path_user = std::string(getenv("HOME")) + DIR_DELIM "."
		+ PROJECT_NAME;
#endif

	return true;
}


//// Mac OS X
#elif defined(__APPLE__)

bool setSystemPaths()
{
	CFBundleRef main_bundle = CFBundleGetMainBundle();
	CFURLRef resources_url = CFBundleCopyResourcesDirectoryURL(main_bundle);
	char path[PATH_MAX];
	if (CFURLGetFileSystemRepresentation(resources_url,
			TRUE, (UInt8 *)path, PATH_MAX)) {
		path_share = std::string(path);
	} else {
		warningstream << "Could not determine bundle resource path" << std::endl;
	}
	CFRelease(resources_url);

	path_user = std::string(getenv("HOME"))
		+ "/Library/Application Support/"
		+ PROJECT_NAME;
	return true;
}


#else

bool setSystemPaths()
{
	path_share = STATIC_SHAREDIR;
	path_user  = std::string(getenv("HOME")) + DIR_DELIM "."
		+ lowercase(PROJECT_NAME);
	return true;
}


#endif

void migrateCachePath()
{
	const std::string local_cache_path = path_user + DIR_DELIM + "cache";

	// Delete tmp folder if it exists (it only ever contained
	// a temporary ogg file, which is no longer used).
	if (fs::PathExists(local_cache_path + DIR_DELIM + "tmp"))
		fs::RecursiveDelete(local_cache_path + DIR_DELIM + "tmp");

	// Bail if migration impossible
	if (path_cache == local_cache_path || !fs::PathExists(local_cache_path)
			|| fs::PathExists(path_cache)) {
		return;
	}
	if (!fs::Rename(local_cache_path, path_cache)) {
		errorstream << "Failed to migrate local cache path "
			"to system path!" << std::endl;
	}
}

void initializePaths()
{
#if RUN_IN_PLACE
	char buf[BUFSIZ];

	infostream << "Using relative paths (RUN_IN_PLACE)" << std::endl;

	bool success =
		getCurrentExecPath(buf, sizeof(buf)) ||
		getExecPathFromProcfs(buf, sizeof(buf));

	if (success) {
		pathRemoveFile(buf, DIR_DELIM_CHAR);
		std::string execpath(buf);

		path_share = execpath + DIR_DELIM "..";
		path_user  = execpath + DIR_DELIM "..";

		if (detectMSVCBuildDir(execpath)) {
			path_share += DIR_DELIM "..";
			path_user  += DIR_DELIM "..";
		}
	} else {
		errorstream << "Failed to get paths by executable location, "
			"trying cwd" << std::endl;

		if (!getCurrentWorkingDir(buf, sizeof(buf)))
			FATAL_ERROR("Ran out of methods to get paths");

		size_t cwdlen = strlen(buf);
		if (cwdlen >= 1 && buf[cwdlen - 1] == DIR_DELIM_CHAR) {
			cwdlen--;
			buf[cwdlen] = '\0';
		}

		if (cwdlen >= 4 && !strcmp(buf + cwdlen - 4, DIR_DELIM "bin"))
			pathRemoveFile(buf, DIR_DELIM_CHAR);

		std::string execpath(buf);

		path_share = execpath;
		path_user  = execpath;
	}
	path_cache = path_user + DIR_DELIM + "cache";
#else
	infostream << "Using system-wide paths (NOT RUN_IN_PLACE)" << std::endl;

	if (!setSystemPaths())
		errorstream << "Failed to get one or more system-wide path" << std::endl;

	// Initialize path_cache
	// First try $XDG_CACHE_HOME/PROJECT_NAME
	const char *cache_dir = getenv("XDG_CACHE_HOME");
	const char *home_dir = getenv("HOME");
	if (cache_dir) {
		path_cache = std::string(cache_dir) + DIR_DELIM + PROJECT_NAME;
	} else if (home_dir) {
		// Then try $HOME/.cache/PROJECT_NAME
		path_cache = std::string(home_dir) + DIR_DELIM + ".cache"
			+ DIR_DELIM + PROJECT_NAME;
	} else {
		// If neither works, use $PATH_USER/cache
		path_cache = path_user + DIR_DELIM + "cache";
	}
	// Migrate cache folder to new location if possible
	migrateCachePath();
#endif

	infostream << "Detected share path: " << path_share << std::endl;
	infostream << "Detected user path: " << path_user << std::endl;
	infostream << "Detected cache path: " << path_cache << std::endl;

#ifdef USE_GETTEXT
	bool found_localedir = false;
#  ifdef STATIC_LOCALEDIR
	if (STATIC_LOCALEDIR[0] && fs::PathExists(STATIC_LOCALEDIR)) {
		found_localedir = true;
		path_locale = STATIC_LOCALEDIR;
		infostream << "Using locale directory " << STATIC_LOCALEDIR << std::endl;
	} else {
		path_locale = getDataPath("locale");
		if (fs::PathExists(path_locale)) {
			found_localedir = true;
			infostream << "Using in-place locale directory " << path_locale
				<< " even though a static one was provided "
				<< "(RUN_IN_PLACE or CUSTOM_LOCALEDIR)." << std::endl;
		}
	}
#  else
	path_locale = getDataPath("locale");
	if (fs::PathExists(path_locale)) {
		found_localedir = true;
	}
#  endif
	if (!found_localedir) {
		warningstream << "Couldn't find a locale directory!" << std::endl;
	}
#endif  // USE_GETTEXT
}



void 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 setWindowIcon(IrrlichtDevice *device)
{
#if defined(XORG_USED)
#	if RUN_IN_PLACE
	return setXorgWindowIconFromPath(device,
			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(device,
			ICON_DIR "/hicolor/128x128/apps/" PROJECT_NAME ".png") ||
		setXorgWindowIconFromPath(device,
			path_share + "/misc/" PROJECT_NAME "-xorg-icon-128.png");
#	endif
#elif defined(_WIN32)
	const video::SExposedVideoData exposedData = device->getVideoDriver()->getExposedVideoData();
	HWND hWnd; // Window handle

	switch (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 setXorgWindowIconFromPath(IrrlichtDevice *device,
	const std::string &icon_file)
{
#ifdef XORG_USED

	video::IVideoDriver *v_driver = 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 = 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;
}

////
//// 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

void attachOrCreateConsole(void)
{
#ifdef _WIN32
	static bool consoleAllocated = false;
	const bool redirected = (_fileno(stdout) == -2 || _fileno(stdout) == -1); // If output is redirected to e.g a file
	if (!consoleAllocated && redirected && (AttachConsole(ATTACH_PARENT_PROCESS) || AllocConsole())) {
		freopen("CONOUT$", "w", stdout);
		freopen("CONOUT$", "w", stderr);
		consoleAllocated = true;
	}
#endif
}

// Load performance counter frequency only once at startup
#ifdef _WIN32

inline double get_perf_freq()
{
	LARGE_INTEGER freq;
	QueryPerformanceFrequency(&freq);
	return freq.QuadPart;
}

double perf_freq = get_perf_freq();

#endif

} //namespace porting