languages support (WIP)

res/content/base/texts/en_US.txt

@@ -0,0 +1,22 @@
+bazalt=Bazalt
+blue_lamp=Blue Lamp
+brick=Brick
+dirt=Dirt
+flower=Flower
+glass=Glass
+grass_block=Ground
+grass=Tall Grass
+green_lamp=Green Lamp
+lamp=Lamp
+leaves=Leaves
+lightbulb=Bulb
+metal=Metal
+pane=Pane
+pipe=Pipe
+planks=Planks
+red_lamp=Red Lamp
+rust=Rust
+sand=Sand
+stone=Stone
+water=Water
+wood=Wood

res/content/base/texts/ru_RU.txt

@@ -0,0 +1,22 @@
+bazalt=Базальт
+blue_lamp=Синяя Лампа
+brick=Кирпич
+dirt=Земля
+flower=Цветок
+glass=Стекло
+grass_block=Дёрн
+grass=Высокая Трава
+green_lamp=Зелёная Лампа
+lamp=Лампа
+leaves=Листва
+lightbulb=Лампочка
+metal=Металл
+pane=Панель
+pipe=Труба
+planks=Доски
+red_lamp=Красная Лампа
+rust=Ржавчина
+sand=Песок
+stone=Камень
+water=Вода
+wood=Бревно

res/texts/en_US.txt

@@ -0,0 +1,39 @@
+# Menu
+menu.new-world=New World
+menu.quit=Quit
+menu.create-world=Create World
+menu.save-and-quit=Save and Quit to Menu
+menu.missing-content=Missing Content!
+menu.controls=Controls
+menu.back-to-menu=Back to Main Menu
+menu.settings=Settings
+world.seed=Seed
+world.name=World Name
+world.create=Create World
+
+# Settings
+chunks.load-distance=Load Distance
+chunks.load-speed=Load Speed
+graphics.fog-curve=Fog Curve
+graphics.backlight=Backlight
+display.vsync=V-Sync
+camera.fov=FOV
+mouse.sensitivity=Mouse Sensitivity
+
+# Bindings
+movement.forward=Forward
+movement.back=Back
+movement.left=Left
+movement.right=Right
+movement.jump=Jump
+movement.sprint=Sprint
+movement.crouch=Crouch
+movement.cheat=Cheat
+hud.inventory=Inventory
+player.pick=Pick Block
+player.attack=Attack / Break
+player.build=Place Block
+player.flight=Flight
+player.noclip=No-clip
+camera.zoom=Zoom
+camera.mode=Switch Camera Mode

res/texts/langs.json

@@ -0,0 +1,11 @@
+{
+    "langs": {
+        "en_US": {
+            "name": "English"
+        },
+        "ru_RU": {
+            "name": "Русский"
+        }
+    },
+    "fallback": "en_US"
+}

res/texts/ru_RU.txt

@@ -0,0 +1,45 @@
+# Общее
+Yes=Да
+No=Нет
+Ok=Ок
+Back=Назад
+Continue=Продолжить
+
+# Меню
+menu.new-world=Новый Мир
+menu.quit=Выход
+menu.continue=Продолжить
+menu.save-and-quit=Сохранить и Выйти в Меню
+menu.missing-content=Отсутствует Контент!
+menu.controls=Управление
+menu.back-to-menu=Вернуться в Меню
+menu.settings=Настройки
+world.seed=Зерно
+world.name=Название
+world.create=Создать Мир
+
+# Настройки
+chunks.load-distance=Дистанция Загрузки
+chunks.load-speed=Скорость Загрузки
+graphics.fog-curve=Кривая Тумана
+graphics.backlight=Подсветка
+display.vsync=V-Sync
+camera.fov=Поле Зрения
+mouse.sensitivity=Чувствительность Мыши
+
+# Управление
+movement.forward=Вперёд
+movement.back=Назад
+movement.left=Влево
+movement.right=Вправо
+movement.jump=Прыжок
+movement.sprint=Ускорение
+movement.crouch=Красться
+movement.cheat=Чит
+hud.inventory=Инвентарь
+player.pick=Подобрать Блок
+player.attack=Атаковать / Сломать
+player.build=Поставить Блок
+player.flight=Полёт
+camera.zoom=Приближение
+camera.mode=Сменить Режим Камеры

src/coders/commons.cpp

@@ -98,6 +98,18 @@ void BasicParser::skipWhitespace() {
     }
 }
 
+void BasicParser::skipLine() {
+    while (hasNext()) {
+        if (source[pos] == '\n') {
+            pos++;
+            linestart = pos;
+            line++;
+            break;
+        }
+        pos++;
+    }
+}
+
 bool BasicParser::hasNext() {
     return pos < source.length();
 }
@@ -250,7 +262,7 @@ bool BasicParser::parseNumber(int sign, number_u& out) {
     return true;
 }
 
-string BasicParser::parseString(char quote) {
+string BasicParser::parseString(char quote, bool closeRequired) {
     std::stringstream ss;
     while (hasNext()) {
         char c = source[pos];
@@ -282,14 +294,17 @@ string BasicParser::parseString(char quote) {
             }
             continue;
         }
-        if (c == '\n') {
+        if (c == '\n' && closeRequired) {
             throw error("non-closed string literal");
         }
         ss << c;
         pos++;
     }
+    if (closeRequired) {
         throw error("unexpected end");
     }
+    return ss.str();
+}
 
 parsing_error BasicParser::error(std::string message) {
     return parsing_error(message, filename, source, pos, line, linestart);

src/coders/commons.h

@@ -70,6 +70,7 @@ protected:
     uint linestart = 0;
 
     virtual void skipWhitespace();
+    void skipLine();
     void expect(char expected);
     char peek();
     char nextChar();
@@ -79,7 +80,7 @@ protected:
     std::string parseName();
     int64_t parseSimpleInt(int base);
     bool parseNumber(int sign, number_u& out);
-    std::string parseString(char chr);
+    std::string parseString(char chr, bool closeRequired=true);
 
     parsing_error error(std::string message);
 

src/coders/toml.cpp

@@ -115,16 +115,7 @@ Reader::Reader(Wrapper* wrapper, string file, string source) : BasicParser(file,
 void Reader::skipWhitespace() {
     BasicParser::skipWhitespace();
     if (hasNext() && source[pos] == '#') {
-        pos++;
+        skipLine();
-        while (hasNext()) {
-            if (source[pos] == '\n') {
-                pos++;
-                linestart = pos;
-                line++;
-                break;
-            }
-            pos++;
-        }
         if (hasNext() && is_whitespace(peek())) {
             skipWhitespace();
         }

src/constants.h

@@ -5,7 +5,7 @@
 #include "typedefs.h"
 
 const int ENGINE_VERSION_MAJOR = 0;
-const int ENGINE_VERSION_MINOR = 15;
+const int ENGINE_VERSION_MINOR = 16;
 
 const int CHUNK_W = 16;
 const int CHUNK_H = 256;
@@ -16,6 +16,7 @@ const int CHUNK_VOL = (CHUNK_W * CHUNK_H * CHUNK_D);
 
 /* BLOCK_VOID is block id used to mark non-existing voxel (voxel of missing chunk) */
 const blockid_t BLOCK_VOID = std::numeric_limits<blockid_t>::max();
+const blockid_t MAX_BLOCKS = BLOCK_VOID;
 
 inline uint vox_index(int x, int y, int z, int w=CHUNK_W, int d=CHUNK_D) {
 	return (y * d + z) * w + x;

src/content/ContentPack.cpp

@@ -0,0 +1,17 @@
+#include "ContentPack.h"
+
+using std::string;
+using std::filesystem::path;
+
+ContentPack::ContentPack(const string id,
+                         const path folder) 
+    : id(id), folder(folder) {
+    
+}
+const string& ContentPack::getId() const {
+    return id;
+}
+
+const path& ContentPack::getFolder() const {
+    return folder;
+}

src/content/ContentPack.h

@@ -0,0 +1,18 @@
+#ifndef CONTENT_CONTENT_PACK_H_
+#define CONTENT_CONTENT_PACK_H_
+
+#include <string>
+#include <filesystem>
+
+class ContentPack {
+    const std::string id;
+    const std::filesystem::path folder;
+public:
+    ContentPack(const std::string id,
+                const std::filesystem::path folder);
+
+    const std::string& getId() const;
+    const std::filesystem::path& getFolder() const;
+};
+
+#endif // CONTENT_CONTENT_PACK_H_

src/engine.cpp

@@ -3,6 +3,7 @@
 #include <memory>
 #include <iostream>
 #include <assert.h>
+#include <vector>
 #include <glm/glm.hpp>
 #include <filesystem>
 #define GLEW_STATIC
@@ -27,6 +28,9 @@
 #include "files/files.h"
 #include "files/engine_paths.h"
 
+#include "content/ContentPack.h"
+#include "frontend/locale/langs.h"
+
 using std::unique_ptr;
 using std::shared_ptr;
 using std::string;
@@ -55,6 +59,16 @@ Engine::Engine(EngineSettings& settings, EnginePaths* paths, Content* content)
 	}
 	Audio::initialize();
 	gui = new GUI();
+
+    std::vector<const ContentPack*> packs;
+    auto resdir = paths->getResources();
+    auto base = std::make_unique<ContentPack>("base", resdir/path("content/base"));
+    packs.push_back(base.get());
+
+    if (settings.ui.language == "auto") {
+        settings.ui.language = platform::detect_locale();
+    }
+    langs::setup(resdir, settings.ui.language, packs);
 	std::cout << "-- initializing finished" << std::endl;
 }
 

src/files/settings_io.cpp

@@ -39,6 +39,9 @@ toml::Wrapper create_wrapper(EngineSettings& settings) {
 	debug.add("generator-test-mode", &settings.debug.generatorTestMode);
 	debug.add("show-chunk-borders", &settings.debug.showChunkBorders);
 	debug.add("do-write-lights", &settings.debug.doWriteLights);
+
+    toml::Section& ui = wrapper.add("ui");
+    ui.add("language", &settings.ui.language);
 	return wrapper;
 }
 

src/frontend/gui/gui_util.cpp

@@ -4,6 +4,8 @@
 
 #include <glm/glm.hpp>
 
+#include "../locale/langs.h"
+
 using namespace gui;
 using glm::vec2;
 using glm::vec4;
@@ -11,7 +13,7 @@ using std::string;
 using std::wstring;
 
 Button* guiutil::backButton(PagesControl* menu) {
-    return (new Button(L"Back", vec4(10.f)))->listenAction([=](GUI* gui) {
+    return (new Button(langs::get(L"Back"), vec4(10.f)))->listenAction([=](GUI* gui) {
         menu->back();
     });
 }
@@ -27,7 +29,7 @@ void guiutil::alert(GUI* gui, wstring text, gui::runnable on_hidden) {
     Panel* panel = new Panel(vec2(500, 200), vec4(8.0f), 8.0f);
     panel->color(vec4(0.0f, 0.0f, 0.0f, 0.5f));
     panel->add(new Label(text));
-    panel->add((new Button(L"Ok", vec4(10.f)))->listenAction([=](GUI* gui) {
+    panel->add((new Button(langs::get(L"Ok"), vec4(10.f)))->listenAction([=](GUI* gui) {
         if (on_hidden)
             on_hidden();
         menu->back();
@@ -39,6 +41,9 @@ void guiutil::alert(GUI* gui, wstring text, gui::runnable on_hidden) {
 
 void guiutil::confirm(GUI* gui, wstring text, gui::runnable on_confirm,
                       wstring yestext, wstring notext) {
+    if (yestext.empty()) yestext = langs::get(L"Yes");
+    if (notext.empty()) notext = langs::get(L"No");
+
     PagesControl* menu = gui->getMenu();
     Panel* panel = new Panel(vec2(600, 200), vec4(8.0f), 8.0f);
     panel->color(vec4(0.0f, 0.0f, 0.0f, 0.5f));

src/frontend/gui/gui_util.h

@@ -13,7 +13,7 @@ namespace guiutil {
     gui::Button* gotoButton(std::wstring text, std::string page, gui::PagesControl* menu);
     void alert(gui::GUI* gui, std::wstring text, gui::runnable on_hidden=nullptr);
     void confirm(gui::GUI* gui, std::wstring text, gui::runnable on_confirm=nullptr,
-                 std::wstring yestext=L"Yes", std::wstring notext=L"No");
+                 std::wstring yestext=L"", std::wstring notext=L"");
 }
 
 #endif // FRONTEND_GUI_GUI_UTIL_H_

src/frontend/locale/langs.cpp

@@ -0,0 +1,133 @@
+#include "langs.h"
+
+#include <iostream>
+
+#include "../../coders/json.h"
+#include "../../coders/commons.h"
+#include "../../content/ContentPack.h"
+#include "../../files/files.h"
+#include "../../util/stringutil.h"
+
+using std::string;
+using std::wstring;
+using std::vector;
+using std::unique_ptr;
+using std::unordered_map;
+using std::filesystem::path;
+namespace fs = std::filesystem;
+
+unique_ptr<langs::Lang> langs::current;
+vector<langs::LocaleInfo> langs::locales_info;
+
+langs::Lang::Lang(string locale) : locale(locale) {
+}
+
+const wstring& langs::Lang::get(const wstring& key) const  {
+    auto found = map.find(key);
+    if (found == map.end()) {
+        return key;
+    }
+    return found->second;
+}
+
+void langs::Lang::put(const wstring& key, const wstring& text) {
+    map[key] = text;
+}
+
+/* Language key-value txt files parser */
+class Reader : public BasicParser {
+    void skipWhitespace() override {
+        BasicParser::skipWhitespace();
+        if (hasNext() && source[pos] == '#') {
+            skipLine();
+            if (hasNext() && is_whitespace(peek())) {
+                skipWhitespace();
+            }
+        }
+    }
+public:
+    Reader(string file, string source) : BasicParser(file, source) {
+    }
+
+    void read(langs::Lang& lang, std::string prefix) {
+        skipWhitespace();
+        while (hasNext()) {
+            string key = parseString('=', true);
+            util::trim(key);
+            key = prefix + key;
+            string text = parseString('\n', false);
+            util::trim(text);
+            lang.put(util::str2wstr_utf8(key),
+                     util::str2wstr_utf8(text));
+            skipWhitespace();
+        }
+    }
+};
+
+void langs::loadLocalesInfo(const path& resdir, string& fallback) {
+    path file = resdir/path(langs::TEXTS_FOLDER)/path("langs.json");
+    unique_ptr<json::JObject> root (files::read_json(file));
+
+    langs::locales_info.clear();
+    root->str("fallback", fallback);
+
+    auto langs = root->obj("langs");
+    if (langs) {
+        for (auto& entry : langs->map) {
+            auto langInfo = entry.second;
+
+            string name;
+            if (langInfo->type == json::valtype::object) {
+                name = langInfo->value.obj->getStr("name", "none");
+            } else {
+                continue;
+            }
+
+            std::cout << "locale " << entry.first << " (" << name << ") added" << std::endl;
+            langs::locales_info.push_back(LocaleInfo {entry.first, name});
+        } 
+    }
+}
+
+void langs::load(const path& resdir,
+                 const string& locale,
+                 vector<const ContentPack*>& packs,
+                 Lang& lang) {
+    path filename = path(TEXTS_FOLDER)/path(locale + LANG_FILE_EXT);
+    path core_file = resdir/filename;
+    if (fs::is_regular_file(core_file)) {
+        string text = files::read_string(core_file);
+        Reader reader(core_file.string(), text);
+        reader.read(lang, "");
+    }
+    for (auto pack : packs) {
+        path file = pack->getFolder()/filename;
+        if (fs::is_regular_file(file)) {
+            string text = files::read_string(file);
+            Reader reader(file.string(), text);
+            reader.read(lang, pack->getId()+":");
+        }
+    }
+}
+
+void langs::load(const path& resdir,
+                 const string& locale,
+                 const string& fallback,
+                 vector<const ContentPack*>& packs) {
+    unique_ptr<Lang> lang (new Lang(locale));
+    load(resdir, fallback, packs, *lang.get());
+    load(resdir, locale, packs, *lang.get());
+    current.reset(lang.release());
+}
+
+void langs::setup(const path& resdir,
+                  const string& locale,
+                  vector<const ContentPack*>& packs) {
+    string fallback = langs::FALLBACK_DEFAULT;
+    langs::loadLocalesInfo(resdir, fallback);
+    langs::load(resdir, locale, fallback, packs);
+}
+
+const wstring& langs::get(const wstring& key) {
+    return current->get(key);
+}

src/frontend/locale/langs.h

@@ -0,0 +1,65 @@
+#ifndef FRONTEND_LOCALE_LANGS_H
+#define FRONTEND_LOCALE_LANGS_H
+
+#include <string>
+#include <vector>
+#include <memory>
+#include <filesystem>
+#include <unordered_map>
+
+class ContentPack;
+
+namespace langs {
+    const char LANG_FILE_EXT[] = ".txt";
+    const char TEXTS_FOLDER[] = "texts";
+    const char FALLBACK_DEFAULT[] = "en_US";
+
+    /*
+        Translation is mostly used for rendered text,
+        so Font.draw and Lang both use wstring for strings.
+        
+        Translation key is wstring too, allowing to use it as value 
+        if no any translation found, without conversion required
+
+        Key syntax: `modid:context.key` where modid is added at runtime for
+        content pack texts
+     */
+    class Lang {
+        std::string locale;
+        std::unordered_map<std::wstring, std::wstring> map;
+    public:
+        Lang(std::string locale);
+
+        const std::wstring& get(const std::wstring& key) const;
+        void put(const std::wstring& key, const std::wstring& text);
+    };
+
+    struct LocaleInfo {
+        std::string locale;
+        std::string name;
+    };
+
+    extern std::unique_ptr<Lang> current;
+    extern std::vector<LocaleInfo> locales_info;
+
+    extern void loadLocalesInfo(
+        const std::filesystem::path& resdir,
+        std::string& fallback);
+
+    extern void load(const std::filesystem::path& resdir,
+                     const std::string& locale,
+                     std::vector<const ContentPack*>& packs,
+                     Lang& lang);
+    extern void load(const std::filesystem::path& resdir,
+                     const std::string& locale,
+                     const std::string& fallback,
+                     std::vector<const ContentPack*>& packs);
+
+    extern const std::wstring& get(const std::wstring& key);
+
+    extern void setup(const std::filesystem::path& resdir,
+                      const std::string& locale,
+                      std::vector<const ContentPack*>& packs);
+}
+
+#endif // FRONTEND_LOCALE_LANGS_H

src/frontend/menu.cpp

@@ -23,6 +23,7 @@
 #include "../content/ContentLUT.h"
 
 #include "gui/gui_util.h"
+#include "locale/langs.h"
 
 using glm::vec2;
 using glm::vec4;
@@ -41,7 +42,7 @@ void show_content_missing(GUI* gui, const Content* content, ContentLUT* lut) {
     PagesControl* menu = gui->getMenu();
     Panel* panel = new Panel(vec2(500, 200), vec4(8.0f), 8.0f);
     panel->color(vec4(0.0f, 0.0f, 0.0f, 0.5f));
-    panel->add(new Label(L"Content missing!"));
+    panel->add(new Label(langs::get(L"menu.missing-content")));
 
     Panel* subpanel = new Panel(vec2(500, 100));
     subpanel->color(vec4(0.0f, 0.0f, 0.0f, 0.5f));
@@ -67,7 +68,7 @@ void show_content_missing(GUI* gui, const Content* content, ContentLUT* lut) {
     subpanel->maxLength(400);
     panel->add(subpanel);
 
-    panel->add((new Button(L"Back to Main Menu", vec4(8.0f)))->listenAction([=](GUI*){
+    panel->add((new Button(langs::get(L"menu.back-to-menu"), vec4(8.0f)))->listenAction([=](GUI*){
         menu->back();
     }));
     panel->refresh();
@@ -97,7 +98,7 @@ Panel* create_main_menu_panel(Engine* engine, PagesControl* menu) {
     Panel* panel = new Panel(vec2(400, 200), vec4(5.0f), 1.0f);
     panel->color(vec4(0.0f));
 
-    panel->add(guiutil::gotoButton(L"New World", "new-world", menu));
+    panel->add(guiutil::gotoButton(langs::get(L"menu.new-world"), "new-world", menu));
 
     Panel* worldsPanel = new Panel(vec2(390, 200), vec4(5.0f));
     worldsPanel->color(vec4(1.0f, 1.0f, 1.0f, 0.07f));
@@ -135,8 +136,8 @@ Panel* create_main_menu_panel(Engine* engine, PagesControl* menu) {
         }
     }
     panel->add(worldsPanel);
-    panel->add(guiutil::gotoButton(L"Settings", "settings", menu));
+    panel->add(guiutil::gotoButton(langs::get(L"menu.settings"), "settings", menu));
-    panel->add((new Button(L"Quit", vec4(10.f)))->listenAction([](GUI* gui) {
+    panel->add((new Button(langs::get(L"menu.quit"), vec4(10.f)))->listenAction([](GUI* gui) {
         Window::setShouldClose(true);
     }));
     panel->refresh();
@@ -149,7 +150,7 @@ Panel* create_new_world_panel(Engine* engine, PagesControl* menu) {
 
     TextBox* worldNameInput;
     {
-        Label* label = new Label(L"World Name");
+        Label* label = new Label(langs::get(L"world.name"));
         panel->add(label);
 
         TextBox* input = new TextBox(L"New World", vec4(6.0f));
@@ -159,7 +160,7 @@ Panel* create_new_world_panel(Engine* engine, PagesControl* menu) {
 
     TextBox* seedInput;
     {
-        Label* label = new Label(L"Seed");
+        Label* label = new Label(langs::get(L"world.seed"));
         panel->add(shared_ptr<UINode>(label));
 
         uint64_t randseed = rand() ^ (rand() << 8) ^ 
@@ -173,7 +174,7 @@ Panel* create_new_world_panel(Engine* engine, PagesControl* menu) {
     }
 
     {
-        Button* button = new Button(L"Create World", vec4(10.0f));
+        Button* button = new Button(langs::get(L"world.create"), vec4(10.0f));
         button->margin(vec4(1, 20, 1, 1));
         vec4 basecolor = worldNameInput->color();   
         button->listenAction([=](GUI*) {
@@ -239,7 +240,7 @@ Panel* create_controls_panel(Engine* engine, PagesControl* menu) {
             std::wstringstream ss;
             ss << std::fixed << std::setprecision(1);
             ss << engine->getSettings().camera.sensitivity;
-            return L"Mouse Sensitivity: "+ss.str();
+            return langs::get(L"mouse.sensitivity")+L": "+ss.str();
         }));
 
         TrackBar* trackbar = new TrackBar(0.1, 10.0, 2.0, 0.1, 4);
@@ -264,7 +265,7 @@ Panel* create_controls_panel(Engine* engine, PagesControl* menu) {
 
         InputBindBox* bindbox = new InputBindBox(entry.second);
         subpanel->add(bindbox);
-        Label* label = new Label(util::str2wstr_utf8(bindname));
+        Label* label = new Label(langs::get(util::str2wstr_utf8(bindname)));
         label->margin(vec4(6.0f));
         subpanel->add(label);
         scrollPanel->add(subpanel);
@@ -282,7 +283,7 @@ Panel* create_settings_panel(Engine* engine, PagesControl* menu) {
 
     /* Load Distance setting track bar */{
         panel->add((new Label(L""))->textSupplier([=]() {
-            return L"Load Distance: " + 
+            return langs::get(L"chunks.load-distance")+L": " + 
                 std::to_wstring(engine->getSettings().chunks.loadDistance);
         }));
 
@@ -298,7 +299,7 @@ Panel* create_settings_panel(Engine* engine, PagesControl* menu) {
 
     /* Load Speed setting track bar */{
         panel->add((new Label(L""))->textSupplier([=]() {
-            return L"Load Speed: " + 
+            return langs::get(L"chunks.load-speed")+L": " + 
                 std::to_wstring(engine->getSettings().chunks.loadSpeed);
         }));
 
@@ -317,7 +318,7 @@ Panel* create_settings_panel(Engine* engine, PagesControl* menu) {
             std::wstringstream ss;
             ss << std::fixed << std::setprecision(1);
             ss << engine->getSettings().graphics.fogCurve;
-            return L"Fog Curve: " + ss.str();
+            return langs::get(L"graphics.fog-curve")+L": " + ss.str();
         }));
 
         TrackBar* trackbar = new TrackBar(1.0, 6.0, 1.0, 0.1, 2);
@@ -333,7 +334,7 @@ Panel* create_settings_panel(Engine* engine, PagesControl* menu) {
     /* Fov setting track bar */{
         panel->add((new Label(L""))->textSupplier([=]() {
             int fov = (int)engine->getSettings().camera.fov;
-            return L"FOV: "+std::to_wstring(fov)+L"°";
+            return langs::get(L"camera.fov")+L": "+std::to_wstring(fov)+L"°";
         }));
 
         TrackBar* trackbar = new TrackBar(30.0, 120.0, 90, 1, 4);
@@ -360,7 +361,7 @@ Panel* create_settings_panel(Engine* engine, PagesControl* menu) {
             engine->getSettings().display.swapInterval = checked;
         });
         checkpanel->add(checkbox);
-        checkpanel->add(new Label(L"V-Sync"));
+        checkpanel->add(new Label(langs::get(L"display.vsync")));
 
         panel->add(checkpanel);
     }
@@ -379,12 +380,12 @@ Panel* create_settings_panel(Engine* engine, PagesControl* menu) {
             engine->getSettings().graphics.backlight = checked;
         });
         checkpanel->add(checkbox);
-        checkpanel->add(new Label(L"Backlight"));
+        checkpanel->add(new Label(langs::get(L"graphics.backlight")));
 
         panel->add(checkpanel);
     }
 
-    panel->add(guiutil::gotoButton(L"Controls", "controls", menu));
+    panel->add(guiutil::gotoButton(langs::get(L"menu.controls"), "controls", menu));
     panel->add(guiutil::backButton(menu));
     panel->refresh();
     return panel;
@@ -394,15 +395,15 @@ Panel* create_pause_panel(Engine* engine, PagesControl* menu) {
     Panel* panel = new Panel(vec2(400, 200));
 	panel->color(vec4(0.0f));
 	{
-		Button* button = new Button(L"Continue", vec4(10.0f));
+		Button* button = new Button(langs::get(L"Continue"), vec4(10.0f));
 		button->listenAction([=](GUI*){
 			menu->reset();
 		});
 		panel->add(shared_ptr<UINode>(button));
 	}
-    panel->add(guiutil::gotoButton(L"Settings", "settings", menu));
+    panel->add(guiutil::gotoButton(langs::get(L"Settings"), "settings", menu));
 	{
-		Button* button = new Button(L"Save and Quit to Menu", vec4(10.f));
+		Button* button = new Button(langs::get(L"menu.save-and-quit"), vec4(10.f));
 		button->listenAction([engine](GUI*){
 			engine->setScreen(shared_ptr<Screen>(new MenuScreen(engine)));
 		});

src/settings.h

@@ -61,12 +61,17 @@ struct DebugSettings {
 	bool doWriteLights = true;
 };
 
+struct UiSettings {
+    std::string language = "auto";
+};
+
 struct EngineSettings {
     DisplaySettings display;
 	ChunksSettings chunks;
 	CameraSettings camera;
 	GraphicsSettings graphics;
 	DebugSettings debug;
+    UiSettings ui;
 };
 
 #endif // SRC_SETTINGS_H_

src/util/platform.cpp

@@ -20,6 +20,15 @@ path platform::get_controls_file() {
 	return path(CONTROLS_FILE);
 }
 
+std::string platform::detect_locale() {
+    // TODO: implement
+    std::string name = setlocale(LC_ALL, nullptr);
+    if (name.find("ru_RU") != std::string::npos) {
+        return "ru_RU";
+    }
+    return "en_US";
+}
+
 #ifdef WIN32
 #include <Windows.h>
 

src/util/platform.h

@@ -8,6 +8,7 @@ namespace platform {
     extern void configure_encoding();
     extern std::filesystem::path get_settings_file();
     extern std::filesystem::path get_controls_file();
+    extern std::string detect_locale();
 }
 
 #endif // UTIL_PLATFORM_H_