merge main

2024-05-18 16:39:02 +03:00 · 2024-05-18 16:39:02 +03:00 · 92d4cc904f
commit 92d4cc904f
parent 47214d8e52 d3c9911640
413 changed files with 17872 additions and 13275 deletions
--- a/.gitignore
+++ b/.gitignore
@ -8,6 +8,7 @@ Debug/voxel_engine
 /screenshots
 /out

+/misc
 /world
 /worlds/**/*
 /settings.toml
@ -41,4 +42,4 @@ appimage-build/
 *~

 /res/content/*
-!/res/content/base
+!/res/content/base
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -101,20 +101,19 @@ if (WIN32)
 else()
    find_package(PkgConfig)
    pkg_check_modules(LUAJIT REQUIRED luajit)
+    pkg_check_modules(VORBIS REQUIRED vorbis vorbisfile)
    set(LUA_LIBRARIES ${LUAJIT_LIBRARIES})
-    set(LUA_INCLUDE_DIR ${LUAJIT_INCLUDE_DIR})
+    set(LUA_INCLUDE_DIR ${LUAJIT_INCLUDE_DIRS})
    find_package(PNG REQUIRED)
+    find_package(Lua REQUIRED)
    set(PNGLIB PNG::PNG)
-    set(VORBISLIB vorbis vorbisfile)
+    set(VORBISLIB ${VORBIS_LDFLAGS})
 endif()

-if (APPLE)
-    find_package(glfw3 3.3 REQUIRED)
-endif ()
-
 set(LIBS "")

 if(UNIX)
+    find_package(glfw3 3.3 REQUIRED)
    find_package(Threads REQUIRED)
    set(LIBS ${LIBS} Threads::Threads)
 endif()
--- a/README.md
+++ b/README.md
@ -1,6 +1,6 @@
 # Run with compiled executable file:

-[Download | Скачать](https://github.com/MihailRis/VoxelEngine-Cpp/releases/tag/v20.0)
+[Download | Скачать](https://github.com/MihailRis/VoxelEngine-Cpp/releases/latest)


 # Controls:
@ -42,7 +42,7 @@ sudo ln -s /usr/include/luajit-2.1 /usr/include/lua

 #### RHEL-based distro:
 ```sh
-sudo dnf install glfw-devel glfw glew-devel glm-devel libpng-devel libvorbis-devel openal-devel luajit
+sudo dnf install glfw-devel glfw glew-devel glm-devel libpng-devel libvorbis-devel openal-devel luajit-devel
 ```

 #### Arch-based distro:
--- a/dev/AppImageBuilder.yml
+++ b/dev/AppImageBuilder.yml
@ -26,9 +26,7 @@ AppDir:
    - libglew2.1
    - libpng16-16
    - libopenal1
-    - libopengl0
    - libasound2
-    - libglx0
    - libogg0
    - libvorbis0a
    - libvorbisfile3
--- a/doc/en/8.Scripting.md
+++ b/doc/en/8.Scripting.md
@ -13,6 +13,30 @@ load_script("packid:scripts/script_name.lua") -- load Lua script if not loaded y
 load_script("packid:scripts/script_name.lua", true) -- load Lua script anyway
 ```

+## *pack* library
+
+```python
+pack.is_installed(packid: str) -> bool
+```
+
+Check if specified pack is installed in the world
+
+```python
+pack.data_file(packid: str, filename: str) -> str
+```
+
+Returns data file path like `world:data/packid/filename` 
+and creates missing directories.
+
+Use this function when saving pack settings or other data to the world.
+
+Example:
+```lua
+file.write(pack.data_file(PACK_ID, "example.txt"), text)
+```
+
+For pack *containermod* will write text to the file `world:data/containermod/example.txt`
+
 ## *player* library


@ -71,6 +95,26 @@ world.get_seed() -> int

 Returns world seed.

+## *pack* library
+
+```python
+pack.get_folder(packid: str) -> str
+```
+
+Returns installed content-pack folder
+
+```python
+pack.is_installed(packid: str) -> bool
+```
+
+Check if the world has specified pack installed
+
+```python
+pack.get_installed() -> array of strings
+```
+
+Returns all installed content-pack ids
+
 ## *gui* library

 Library contains ui elements access functions. Library should not be directly used, because script *layouts/layout_name.xml.lua* already has a generated variable **document** (instance of **Document**)
@ -137,6 +181,13 @@ inventory.clone(invid: int) -> int

 Create inventory copy. Returns the created copy ID.

+```python
+inventory.move(invA: int, slotA: int, invB: int, slotB: int)
+```
+
+Move item from slotA of invA to slotB of invB. invA may be the same as invB.
+If slotB will be chosen automaticly if argument is not specified.
+
 ## *block* library

 ```python
@ -313,6 +364,13 @@ hud.close(layoutid: str)

 Remove an element from the screen

+
+```python
+hud.get_block_inventory() -> int
+```
+
+Get open block inventory ID or 0
+
 ## Block events

 ```lua
--- a/doc/ru/5.XML-разметка-интерфейса.md
+++ b/doc/ru/5.XML-разметка-интерфейса.md
@ -60,10 +60,6 @@

 - `src` - имя изображения в папке textures без указания расширения. Тип: строка. Например `gui/error`

-## Изображение `image`
-
- `src` - имя изображения в папке textures без указания расширения. Тип: строка. Например `gui/error`
-
 # Текстовое поле `textbox`

 Внутренний текст - изначально введенный текст
@ -110,4 +106,4 @@
 - `padding` - отступ вокруг решетки слотов. Тип: число.   (*атрибут будет удален*)
 - `sharefunc` - lua событие вызываемое при использовании ЛКМ + Shift. Передается id инвентаря и индекс слота
 - `updatefunc` - lua событие вызываемое при изменении содержимого слота
- `onrightclick` - lua событие вызываемое при использовании ПКМ. Передается id инвентаря и индекс слота
+- `onrightclick` - lua событие вызываемое при использовании ПКМ. Передается id инвентаря и индекс слота
--- a/doc/ru/8.Скриптинг.md
+++ b/doc/ru/8.Скриптинг.md
@ -10,6 +10,29 @@ load_script("контентпак:scripts/имя_скрипта.lua", true) --
 require "контентпак:имя_модуля" -- загружает lua модуль из папки modules (расширение не указывается)
 ```

+## Библиотека pack
+
+```python
+pack.is_installed(packid: str) -> bool
+```
+
+Проверяет наличие установленного пака в мире
+
+```python
+pack.data_file(packid: str, filename: str) -> str
+```
+
+Возвращает путь к файлу данных по типу: `world:data/packid/filename` 
+и создает недостающие директории в пути.
+
+Используйте эту функцию при сохранении настроек пака или иных данных в мире.
+
+Пример:
+```lua
+file.write(pack.data_file(PACK_ID, "example.txt"), text)
+```
+Для пака *containermod* запишет текст в файл `world:data/containermod/example.txt`
+
 ## Библиотека player
 ```python
 player.get_pos(playerid: int) -> number, number, number
@ -66,6 +89,26 @@ world.get_seed() -> int

 Возвращает зерно мира.

+## Библиотека pack
+
+```python
+pack.get_folder(packid: str) -> str
+```
+
+Возвращает путь к папке установленного контент-пака
+
+```python
+pack.is_installed(packid: str) -> bool
+```
+
+Проверяет наличие контент-пака в мире
+
+```python
+pack.get_installed() -> массив строк
+```
+
+Возращает id всех установленных в мире контент-паков
+
 ## Библиотека gui

 Библиотека содержит функции для доступа к свойствам UI элементов. Вместо gui следует использовать объектную обертку, предоставляющую доступ к свойствам через мета-методы __index, __newindex:
@ -132,6 +175,14 @@ inventory.clone(invid: int) -> int

 Создает копию инвентаря и возвращает id копии. Если копируемого инвентаря не существует, возвращает 0. 

+```python
+inventory.move(invA: int, slotA: int, invB: int, slotB: int)
+```
+
+Перемещает предмет из slotA инвентаря invA в slotB инвентаря invB.
+invA и invB могут указывать на один инвентарь.
+slotB будет выбран автоматически, если не указывать явно.
+
 ## Библиотека block

 ```python
@ -303,6 +354,13 @@ hud.close(layoutid: str)
 ```

 Удаляет элемент с экрана
+
+```python
+hud.get_block_inventory() -> int
+```
+
+Получить ID инвентаря открытого блока или 0
+
 ## События блоков

 ```lua
--- a/res/content/base/texts/en_US.txt
+++ b/res/content/base/texts/en_US.txt
@ -1,22 +0,0 @@
-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
--- a/res/content/base/texts/ru_RU.txt
+++ b/res/content/base/texts/ru_RU.txt
@ -1,22 +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
+bazalt=базальт
+blue lamp=синяя лампа
+brick=кирпич
+dirt=земля
+flower=цветок
+glass=стекло
+grass block=дёрн
+tall grass=высокая трава
+green lamp=зелёная лампа
+lamp=лампа
+leaves=листва
+light bulb=лампочка
+metal=металл
+pane=панель
+pipe=труба
+planks=доски
+red lamp=красная лампа
+rust=ржавчина
+sand=песок
+stone=камень
+water=вода
+wood=бревно
--- a/res/layouts/console.xml
+++ b/res/layouts/console.xml
@ -0,0 +1,22 @@
+<container color='#00000080' size='400' size-func="unpack(gui.get_viewport())">
+    <container size-func="gui.get_viewport()[1],gui.get_viewport()[2]-40">
+        <textbox 
+            id='log' 
+            color='0'
+            autoresize='true' 
+            margin='0'
+            editable='false' 
+            multiline='true' 
+            size-func="gui.get_viewport()[1],40"
+            gravity="bottom-left"
+        ></textbox>
+    </container>
+    <textbox id='prompt' 
+             consumer='submit' 
+             margin='0' 
+             gravity='bottom-left' 
+             size-func="gui.get_viewport()[1],40"
+             onup="on_history_up()"
+             ondown="on_history_down()">
+    </textbox>
+</container>
--- a/res/layouts/console.xml.lua
+++ b/res/layouts/console.xml.lua
@ -0,0 +1,53 @@
+history = session.get_entry("commands_history")
+history_pointer = #history
+
+function setup_variables()
+    local x,y,z = player.get_pos(hud.get_player())
+    console.set('pos.x', x)
+    console.set('pos.y', y)
+    console.set('pos.z', z)
+end
+
+function on_history_up()
+    if history_pointer == 0 then
+        return
+    end
+    document.prompt.text = history[history_pointer]
+    document.prompt.caret = -1
+    history_pointer = history_pointer - 1
+end
+
+function on_history_down()
+    if history_pointer == #history-1 then
+        return
+    end
+    history_pointer = history_pointer + 1
+    document.prompt.text = history[history_pointer + 1]
+    document.prompt.caret = -1
+end
+
+function add_to_history(text)
+    table.insert(history, text)
+    history_pointer = #history
+end
+
+function submit(text)
+    add_to_history(text)
+    setup_variables()
+    
+    local status, result = pcall(function() return console.execute(text) end)
+    if result ~= nil then
+        local prevtext = document.log.text
+        if #prevtext == 0 then
+            document.log:paste(tostring(result))
+        else
+            document.log:paste('\n'..tostring(result))
+        end
+    end
+    document.prompt.text = ""
+    document.prompt.focused = true
+end
+
+function on_open()
+    document.prompt.focused = true
+end
--- a/res/layouts/inventory.xml.lua
+++ b/res/layouts/inventory.xml.lua
@ -1,3 +1,8 @@
 function inventory_share_func(invid, slotid)
-    inventory.set(invid, slotid, 0, 0)
+    local blockinv = hud.get_block_inventory()
+    if blockinv ~= 0 then
+        inventory.move(invid, slotid, blockinv)
+    else
+        inventory.set(invid, slotid, 0, 0)
+    end
 end
--- a/res/layouts/pages/404.xml
+++ b/res/layouts/pages/404.xml
@ -0,0 +1,4 @@
+<panel size='400' padding='8' interval='8' color='0'>
+    <label context='menu'>@Page not found</label>
+    <button onclick='menu:back()'>@Back</button>
+</panel>
--- a/res/layouts/pages/content.xml
+++ b/res/layouts/pages/content.xml
@ -0,0 +1,13 @@
+<container size='887,454' color='#0F1E2DB2' padding='8' interval='5' context='menu'>
+    <panel id='packs_cur' pos='2' size='440,406' color='0' max-length='406'>
+        <!-- content is generated in script -->
+    </panel>
+    <panel id='packs_add' pos='445,2' size='440,406' color='0' max-length='406'>
+        <!-- content is generated in script -->
+    </panel>
+    <button id='apply_btn' pos='2,410' size='440,40' onclick='apply()'>@Apply</button>
+    <button pos='445,410' size='398,40' onclick='menu:back()'>@Cancel</button>
+    <image onclick='refresh()' interactive='true' src='gui/refresh' 
+        size='32' margin='7' gravity='bottom-right'
+        color='#FFFFFF80' hover-color='#FFFFFF10'/>
+</container>
--- a/res/layouts/pages/content.xml.lua
+++ b/res/layouts/pages/content.xml.lua
@ -0,0 +1,131 @@
+function on_open(params)
+    if params then
+        mode = params.mode
+    end
+    refresh()
+end
+
+add_packs = {}
+rem_packs = {}
+
+function apply()
+    core.reconfig_packs(add_packs, rem_packs)
+    if mode ~= "world" then
+        menu:back()
+    end
+end
+
+function refresh_changes()
+    document.apply_btn.enabled = (#add_packs>0) or (#rem_packs>0)
+end
+
+function move_pack(id)
+    -- cancel pack addition
+    if table.has(add_packs, id) then
+        document["pack_"..id]:move_into(document.packs_add)
+        table.remove_value(add_packs, id)
+    -- cancel pack removal
+    elseif table.has(rem_packs, id) then
+        document["pack_"..id]:move_into(document.packs_cur)
+        table.remove_value(rem_packs, id)
+    -- add pack
+    elseif table.has(packs_installed, id) then
+        document["pack_"..id]:move_into(document.packs_add)
+        table.insert(rem_packs, id)
+    -- remove pack
+    else
+        document["pack_"..id]:move_into(document.packs_cur)
+        table.insert(add_packs, id)
+    end
+    refresh_changes()
+end
+
+function place_pack(panel, packinfo, callback)
+    if packinfo.error then
+        callback = nil
+    end
+    if packinfo.has_indices then
+        packinfo.id_verbose = packinfo.id.."*"
+    else
+        packinfo.id_verbose = packinfo.id
+    end
+    packinfo.callback = callback
+    panel:add(gui.template("pack", packinfo))
+    if not callback then
+        document["pack_"..packinfo.id].enabled = false
+    end
+end
+
+function check_dependencies(packinfo)
+    if packinfo.dependencies == nil then
+        return
+    end
+    for i,dep in ipairs(packinfo.dependencies) do
+        local depid = dep:sub(2,-1)
+        if dep:sub(1,1) == '!' then 
+            if not table.has(packs_all, depid) then
+                return string.format(
+                    "%s (%s)", gui.str("error.dependency-not-found"), depid
+                )
+            end
+            if table.has(packs_installed, packinfo.id) then
+                table.insert(required, depid)
+            end
+        end
+    end
+    return
+end
+
+function refresh()
+    packs_installed = pack.get_installed()
+    packs_available = pack.get_available()
+    base_packs = pack.get_base_packs()
+    packs_all = {unpack(packs_installed)}
+    required = {}
+    for i,k in ipairs(packs_available) do
+        table.insert(packs_all, k)
+    end
+
+    local packs_cur = document.packs_cur
+    local packs_add = document.packs_add
+    packs_cur:clear()
+    packs_add:clear()
+
+    for i,id in ipairs(packs_installed) do
+        local packinfo = pack.get_info(id)
+        packinfo.index = i
+        callback = not table.has(base_packs, id) and string.format('move_pack("%s")', id) or nil
+        packinfo.error = check_dependencies(packinfo)
+        place_pack(packs_cur, packinfo, callback)
+    end
+
+    for i,id in ipairs(packs_available) do
+        local packinfo = pack.get_info(id)
+        packinfo.index = i
+        callback = string.format('move_pack("%s")', id)
+        packinfo.error = check_dependencies(packinfo)
+        place_pack(packs_add, packinfo, callback)
+    end
+
+    for i,id in ipairs(packs_installed) do
+        if table.has(required, id) then
+            document["pack_"..id].enabled = false
+        end
+    end
+
+    apply_movements(packs_cur, packs_add)
+    refresh_changes()
+end
+
+function apply_movements(packs_cur, packs_add)
+    for i,id in ipairs(packs_installed) do
+        if table.has(rem_packs, id) then
+            document["pack_"..id]:move_into(packs_add)
+        end
+    end
+    for i,id in ipairs(packs_available) do
+        if table.has(add_packs, id) then
+            document["pack_"..id]:move_into(packs_cur)
+        end
+    end
+end
--- a/res/layouts/pages/generators.xml
+++ b/res/layouts/pages/generators.xml
@ -0,0 +1,3 @@
+<panel size='400' color='#00000080' padding='8' context='settings'>
+    <!-- content is generated in script -->
+</panel>
--- a/res/layouts/pages/generators.xml.lua
+++ b/res/layouts/pages/generators.xml.lua
@ -0,0 +1,16 @@
+settings = session.get_entry('new_world')
+
+function on_open()
+    local names = core.get_generators()
+    table.sort(names)
+
+    local panel = document.root
+    for _,k in ipairs(names) do
+        panel:add(gui.template("generator", {
+            callback=string.format("settings.generator=%q menu:back()", k),
+            id=k,
+            name=settings.generator_name(k)
+        }))
+    end
+    panel:add("<button onclick='menu:back()'>@Back</button>")
+end
--- a/res/layouts/pages/languages.xml
+++ b/res/layouts/pages/languages.xml
@ -0,0 +1,3 @@
+<panel size='400' color='#00000080' padding='8'>
+    <!-- content is generated in script -->
+</panel>
--- a/res/layouts/pages/languages.xml.lua
+++ b/res/layouts/pages/languages.xml.lua
@ -0,0 +1,19 @@
+function on_open()
+    local locales = gui.get_locales_info()
+    local invlocales = {}
+    local names = {}
+    for k, v in pairs(locales) do
+        table.insert(names, v.name)
+        invlocales[v.name] = k
+    end
+    table.sort(names)
+    
+    local panel = document.root
+    for _,k in ipairs(names) do
+        panel:add(string.format(
+            "<button onclick=%q>%s</button>",
+            string.format("core.set_setting('ui.language', %q) menu:back()", invlocales[k]), k
+        ))
+    end
+    panel:add("<button onclick='menu:back()'>@Back</button>")
+end
--- a/res/layouts/pages/main.xml
+++ b/res/layouts/pages/main.xml
@ -0,0 +1,7 @@
+<panel size='400' color='0' interval='1' context='menu'>
+    <button onclick='menu.page="new_world"'>@New World</button>
+    <panel id='worlds' size='390,1' padding='5' color='#FFFFFF11' max-length='400'>
+    </panel>
+    <button onclick='menu.page="settings"'>@Settings</button>
+    <button onclick='core.quit()'>@Quit</button>
+</panel>
--- a/res/layouts/pages/main.xml.lua
+++ b/res/layouts/pages/main.xml.lua
@ -0,0 +1,6 @@
+function on_open()
+    local worlds = world.get_list()
+    for _, info in ipairs(worlds) do
+        document.worlds:add(gui.template("world", info))
+    end
+end
--- a/res/layouts/pages/new_world.xml
+++ b/res/layouts/pages/new_world.xml
@ -0,0 +1,18 @@
+<panel size='400' color='0' interval='1' context='world'>
+    <label>@Name</label>
+    <textbox id='name_box' 
+             validator='world_name_validator' 
+             placeholder='New World' 
+             padding='4'>
+    </textbox>
+    <label>@Seed</label>
+    <textbox id='seed_box' placeholder='-' padding='4'></textbox>
+    <button onclick='save_state() menu.page="generators"' id='generator_btn'>
+        @World generator
+    </button>
+    <button id='content_btn' onclick='save_state() menu.page="content"'/>
+    <button onclick='create_world()' margin='1,20,1,1'>
+        @Create World
+    </button>
+    <button onclick='menu:back()'>@Back</button>
+</panel>
--- a/res/layouts/pages/new_world.xml.lua
+++ b/res/layouts/pages/new_world.xml.lua
@ -0,0 +1,47 @@
+settings = session.get_entry('new_world')
+
+function world_name_validator(name)
+    return name:match("^[%w-\\.\\ ]+$") ~= nil and not world.exists(name)
+end
+
+function save_state()
+    settings.name = document.name_box.text
+    settings.seed = document.seed_box.text
+end
+
+function settings.generator_name(id)
+    local prefix, name = parse_path(id)
+    if prefix == "core" then
+        return gui.str(name, "world.generators")
+    else
+        return id
+    end
+end
+
+function create_world()
+    if not document.name_box.valid then
+        return
+    end
+    local name = document.name_box.text
+    local seed = document.seed_box.text
+    local generator = settings.generator
+    session.reset_entry('new_world')
+    core.new_world(name, seed, generator)
+end
+
+function on_open()
+    document.content_btn.text = string.format(
+        "%s [%s]", gui.str("Content", "menu"), #pack.get_installed()
+    )
+    if settings.generator == nil then
+        settings.generator = core.get_default_generator()
+    end
+    document.generator_btn.text = string.format(
+        "%s: %s", 
+        gui.str("World generator", "world"), 
+        settings.generator_name(settings.generator)
+    )
+    document.name_box.text = settings.name or ''
+    document.seed_box.text = settings.seed or ''
+    document.seed_box.placeholder = tostring(math.random()):sub(3)
+end
--- a/res/layouts/pages/pause.xml
+++ b/res/layouts/pages/pause.xml
@ -0,0 +1,8 @@
+<panel size='400' color='0' interval='1' context='menu'>
+    <button onclick='menu:reset()'>@Continue</button>
+    <button onclick='menu.page="content?mode=world"'>@Content</button>
+    <button onclick='menu.page="settings"'>@Settings</button>
+    <button onclick='core.close_world(true)'>
+        @Save and Quit to Menu
+    </button>
+</panel>
--- a/res/layouts/pages/settings.xml
+++ b/res/layouts/pages/settings.xml
@ -0,0 +1,14 @@
+<container size='668,418' color='#0F1E2DB2' context='menu'>
+    <panel pos='6' size='250' color='0' interval='1'>
+        <button id='s_aud' onclick='set_page("s_aud", "settings_audio")'>@Audio</button>
+        <button id='s_gfx' onclick='set_page("s_gfx", "settings_graphics")'>@Graphics</button>
+        <button id='s_ctl' onclick='set_page("s_ctl", "settings_controls")'>@Controls</button>
+    </panel>
+    <pagebox id='menu' pos='260,6' size='400'>
+    </pagebox>
+
+    <panel margin='6' gravity='bottom-left' size='250' color='0' interval='1'>
+        <button onclick='menu.page="languages"' id='langs_btn'>-</button>
+        <button onclick='menu:back()'>@Back</button>
+    </panel>
+</container>
--- a/res/layouts/pages/settings.xml.lua
+++ b/res/layouts/pages/settings.xml.lua
@ -0,0 +1,15 @@
+function on_open()
+    document.langs_btn.text = string.format(
+        "%s: %s", gui.str("Language", "settings"),
+        gui.get_locales_info()[core.get_setting("ui.language")].name
+    )
+    set_page("s_gfx", "settings_graphics")
+end
+
+function set_page(btn, page)
+    document.s_aud.enabled = true
+    document.s_gfx.enabled = true
+    document.s_ctl.enabled = true
+    document[btn].enabled = false
+    document.menu.page = page
+end
--- a/res/layouts/pages/settings_audio.xml
+++ b/res/layouts/pages/settings_audio.xml
@ -0,0 +1,2 @@
+<panel size='400' color='0' interval='1'>
+</panel>
--- a/res/layouts/pages/settings_audio.xml.lua
+++ b/res/layouts/pages/settings_audio.xml.lua
@ -0,0 +1,33 @@
+function create_setting(id, name, step, postfix)
+    local info = core.get_setting_info(id)
+    postfix = postfix or ""
+    document.root:add(gui.template("track_setting", {
+        id=id,
+        name=gui.str(name, "settings"),
+        value=core.get_setting(id),
+        min=info.min,
+        max=info.max,
+        step=step,
+        postfix=postfix
+    }))
+    update_setting(core.get_setting(id), id, name, postfix)
+end
+
+function update_setting(x, id, name, postfix)
+    core.set_setting(id, x)
+    -- updating label
+    document[id..".L"].text = string.format(
+        "%s: %s%s", 
+        gui.str(name, "settings"), 
+        core.str_setting(id), 
+        postfix
+    )
+end
+
+function on_open()
+    create_setting("audio.volume-master", "Master Volume", 0.01)
+    create_setting("audio.volume-regular", "Regular Sounds", 0.01)
+    create_setting("audio.volume-ui", "UI Sounds", 0.01)
+    create_setting("audio.volume-ambient", "Ambient", 0.01)
+    create_setting("audio.volume-music", "Music", 0.01)
+end
--- a/res/layouts/pages/settings_controls.xml
+++ b/res/layouts/pages/settings_controls.xml
@ -0,0 +1,10 @@
+<panel size='400' color='0'>
+    <label id='sensitivity_label'>-</label>
+    <trackbar id='sensitivity_track' 
+              min='0.1' max='10' value='2' step='0.1'
+              consumer='change_sensitivity'>
+    </trackbar>
+    <panel id='bindings_panel' size='380,204' padding='2' interval='1' max-length='350' color='#0000004C'>
+        <!-- content is generated in script -->
+    </panel>
+</panel>
--- a/res/layouts/pages/settings_controls.xml.lua
+++ b/res/layouts/pages/settings_controls.xml.lua
@ -0,0 +1,25 @@
+function refresh_sensitivity()
+    document.sensitivity_label.text = string.format(
+        "%s: %s", 
+        gui.str("Mouse Sensitivity", "settings"),
+        core.str_setting("camera.sensitivity")
+    )
+end
+
+function change_sensitivity(val)
+    core.set_setting("camera.sensitivity", val)
+    refresh_sensitivity()
+end
+
+function on_open()
+    document.sensitivity_track.value = core.get_setting("camera.sensitivity")
+    refresh_sensitivity()
+
+    local panel = document.bindings_panel
+    local bindings = core.get_bindings()
+    for i,name in ipairs(bindings) do
+        panel:add(gui.template("binding", {
+            id=name, name=gui.str(name)
+        }))
+    end
+end
--- a/res/layouts/pages/settings_graphics.xml
+++ b/res/layouts/pages/settings_graphics.xml
@ -0,0 +1,2 @@
+<panel size='400' color='0' interval='1' context='menu'>
+</panel>
--- a/res/layouts/pages/settings_graphics.xml.lua
+++ b/res/layouts/pages/settings_graphics.xml.lua
@ -0,0 +1,44 @@
+function create_setting(id, name, step, postfix)
+    local info = core.get_setting_info(id)
+    postfix = postfix or ""
+    document.root:add(gui.template("track_setting", {
+        id=id,
+        name=gui.str(name, "settings"),
+        value=core.get_setting(id),
+        min=info.min,
+        max=info.max,
+        step=step,
+        postfix=postfix
+    }))
+    update_setting(core.get_setting(id), id, name, postfix)
+end
+
+function update_setting(x, id, name, postfix)
+    core.set_setting(id, x)
+    -- updating label
+    document[id..".L"].text = string.format(
+        "%s: %s%s", 
+        gui.str(name, "settings"), 
+        core.str_setting(id), 
+        postfix
+    )
+end
+
+function create_checkbox(id, name)
+    document.root:add(string.format(
+        "<checkbox consumer='function(x) core.set_setting(\"%s\", x) end' checked='%s'>%s</checkbox>", 
+        id, core.str_setting(id), gui.str(name, "settings")
+    ))
+end
+
+function on_open()
+    create_setting("chunks.load-distance", "Load Distance", 1)
+    create_setting("chunks.load-speed", "Load Speed", 1)
+    create_setting("graphics.fog-curve", "Fog Curve", 0.1)
+    create_setting("graphics.gamma", "Gamma", 0.05)
+    create_setting("camera.fov", "FOV", 1, "°")
+    create_checkbox("display.fullscreen", "Fullscreen")
+    create_checkbox("display.vsync", "V-Sync")
+    create_checkbox("graphics.backlight", "Backlight")
+    create_checkbox("camera.shaking", "Camera Shaking")
+end
--- a/res/layouts/process.xml
+++ b/res/layouts/process.xml
@ -0,0 +1,4 @@
+<panel size='400' padding='8' interval='1' color='#00000080'>
+    <label id='title_label'>???</label>
+    <label id='progress_label'>-</label>
+</panel>
--- a/res/layouts/process.xml.lua
+++ b/res/layouts/process.xml.lua
@ -0,0 +1,10 @@
+function on_progress(done, total)
+    local progress = done / total
+    document.progress_label.text = string.format(
+        "%s/%s (%s%%)", done, total, math.floor(progress*100)
+    )
+end
+
+function on_open(title)
+    document.title_label.text = title
+end
--- a/res/layouts/reports/missing_content.xml
+++ b/res/layouts/reports/missing_content.xml
@ -0,0 +1,7 @@
+<panel size='500' color='#00000080' padding='8' context='menu'>
+    <label>@missing-content</label>
+    <panel id='content_panel' size='480,100' color='#00000080' scrollable='true' max-length='400'>
+        <!-- content is generated in script -->
+    </panel>
+    <button onclick='menu:back()'>@Back to Main Menu</button>
+</panel>
--- a/res/layouts/reports/missing_content.xml.lua
+++ b/res/layouts/reports/missing_content.xml.lua
@ -0,0 +1,5 @@
+function on_open(report)
+    for i, entry in ipairs(report.content) do
+        document.content_panel:add(gui.template("content_entry", entry))
+    end
+end
--- a/res/layouts/templates/binding.xml
+++ b/res/layouts/templates/binding.xml
@ -0,0 +1,4 @@
+<panel size='400,40' padding='4' color='0' orientation='horizontal'>
+    <bindbox binding='%{id}'/>
+    <label margin='6'>%{name}</label>
+</panel>
--- a/res/layouts/templates/content_entry.xml
+++ b/res/layouts/templates/content_entry.xml
@ -0,0 +1,4 @@
+<panel size='500,20' color='0' orientation='horizontal' padding='2'>
+    <label color='#80808080'>[%{type}]</label>
+    <label color='#FF333380'>"%{name}</label>
+</panel>
--- a/res/layouts/templates/generator.xml
+++ b/res/layouts/templates/generator.xml
@ -0,0 +1,4 @@
+<container onclick='%{callback}' size='80,30' hover-color='#FFFFFF10'>
+    <label pos='80,4' size='300,25' color='#FFFFFF80' align='right'>[%{id}]</label>
+    <label pos='0,8'>%{name}</label>
+</container>
--- a/res/layouts/templates/pack.xml
+++ b/res/layouts/templates/pack.xml
@ -0,0 +1,15 @@
+<container id='pack_%{id}' onclick='%{callback}' size='0,80' color='#00000040' hover-color='#00000080' z-index="%{index}">
+    <label color='#FFFFFF80' size='300,25' align='right' gravity='top-right'>
+        [%{id_verbose}]
+    </label>
+    <label pos='78,6'>%{title}</label>
+    <label if='%{creator}' color='#CCFFE5B2' size='300,20' align='right' 
+           gravity='bottom-right'>
+        %{creator}
+    </label>
+    <label if='%{error}' pos='80,28' size='355,50' multiline='true' color='#FF4040'>%{error}</label>
+    <label ifnot='%{error}' pos='80,28' size='355,50' multiline='true' color='#FFFFFFB2'>
+        %{description}
+    </label>
+    <image pos='8,8' src='%{icon}' size='64'/>
+</container>
--- a/res/layouts/templates/track_setting.xml
+++ b/res/layouts/templates/track_setting.xml
@ -0,0 +1,6 @@
+<panel color='0' context='settings'>
+    <label id='%{id}.L' margin='0,3,0,0'>%{name}: %{value}%{postfix}</label>
+    <trackbar 
+        value='%{value}' min='%{min}' max='%{max}' step='%{step}'
+        consumer='function(x) update_setting(x, "%{id}", "%{name}", "%{postfix}") end'/>
+</panel>
--- a/res/layouts/templates/world.xml
+++ b/res/layouts/templates/world.xml
@ -0,0 +1,17 @@
+<container 
+    size='380,66'
+    color='#0F1E2DB2'
+    hover-color='#162B3399'
+    onclick='core.open_world("%{name}")'
+>
+    <image pos='1' src='%{icon}' size='96,64'></image>
+    <label pos='104,8'>%{name}</label>
+    <button margin='4'
+            gravity='center-right'
+            color='#00000000'
+            hover-color='#FFFFFF2B'
+            padding='0'
+            onclick='core.delete_world("%{name}")'>
+        <image src='gui/delete_icon' size='32,32' color='#FFFFFF50'/>
+    </button>
+</container>
--- a/res/preload.json
+++ b/res/preload.json
@ -11,4 +11,3 @@
        "gui/crosshair"
    ]
 }
-
--- a/res/scripts/stdcmd.lua
+++ b/res/scripts/stdcmd.lua
@ -0,0 +1,89 @@
+local SEPARATOR = "________________"
+SEPARATOR = SEPARATOR..SEPARATOR..SEPARATOR
+
+function build_scheme(command)
+    local str = command.name.." "
+    for i,arg in ipairs(command.args) do
+        if arg.optional then
+            str = str.."["..arg.name.."] "
+        else
+            str = str.."<"..arg.name.."> "
+        end
+    end
+    return str
+end
+
+console.add_command(
+    "help name:str=''",
+    "Show help infomation for the specified command",
+    function (args, kwargs)
+        local name = args[1]
+        if #name == 0 then
+            local commands = console.get_commands_list()
+            table.sort(commands)
+            local str = "Available commands:"
+            for i,k in ipairs(commands) do
+                str = str.."\n  "..build_scheme(console.get_command_info(k))
+            end
+            return str.."\nuse 'help <command>'"
+        end
+        local command = console.get_command_info(name)
+        if command == nil then
+            return string.format("command %q not found", name)
+        end
+        local where = ""
+        local str = SEPARATOR.."\n"..command.description.."\n"..name.." "
+        for i,arg in ipairs(command.args) do
+            where = where.."\n  "..arg.name.." - "..arg.type
+            if arg.optional then
+                str = str.."["..arg.name.."] "
+                where = where.." (optional)"
+            else
+                str = str.."<"..arg.name.."> "
+            end
+        end
+        if #command.args then
+            str = str.."\nwhere"..where
+        end
+        
+        return str.."\n"..SEPARATOR
+    end
+)
+
+console.add_command(
+    "obj.tp obj:sel=$obj.id x:num~pos.x y:num~pos.y z:num~pos.z",
+    "Teleport object",
+    function (args, kwargs)
+        player.set_pos(unpack(args))
+    end
+)
+console.add_command(
+    "echo value:str",
+    "Print value to the console",
+    function (args, kwargs)
+        return args[1]
+    end
+)
+console.add_command(
+    "time.set value:num",
+    "Set day time [0..1] where 0 is midnight, 0.5 is noon",
+    function (args, kwargs)
+        return world.set_day_time(args[1])
+    end
+)
+console.add_command(
+    "blocks.fill id:str x:num~pos.x y:num~pos.y z:num~pos.z w:int h:int d:int",
+    "Fill specified zone with blocks",
+    function (args, kwargs)
+        local name, x, y, z, w, h, d = unpack(args)
+        local id = block.index(name)
+        for ly=0,h-1 do
+            for lz=0,d-1 do
+                for lx=0,w-1 do
+                    block.set(x+lx, y+ly, z+lz, id)
+                end
+            end
+        end
+        return tostring(w*h*d).." blocks set"
+    end
+)
--- a/res/scripts/stdlib.lua
+++ b/res/scripts/stdlib.lua
@ -131,7 +131,9 @@ events = {
 }

 function events.on(event, func)
-    events.handlers[event] = events.handlers[event] or {}
+    -- why an array? length is always = 1
+    -- FIXME: temporary fixed
+    events.handlers[event] = {} -- events.handlers[event] or {}
    table.insert(events.handlers[event], func)
 end

@ -175,11 +177,114 @@ Document = {}
 function Document.new(docname)
    return setmetatable({name=docname}, {
        __index=function(self, k)
-            return Element.new(self.name, k)
+            local elem = Element.new(self.name, k)
+            rawset(self, k, elem)
+            return elem
        end
    })
 end

+_GUI_ROOT = Document.new("core:root")
+_MENU = _GUI_ROOT.menu
+menu = _MENU
+
+local __post_runnables = {}
+
+function __process_post_runnables()
+    if #__post_runnables then
+        for _, func in ipairs(__post_runnables) do
+            func()
+        end
+        __post_runnables = {}
+    end
+end
+
+function time.post_runnable(runnable)
+    table.insert(__post_runnables, runnable)
+end
+
+function gui.template(name, params)
+    local text = file.read(file.find("layouts/templates/"..name..".xml"))
+    for k,v in pairs(params) do
+        local arg = tostring(v):gsub("'", "\\'"):gsub('"', '\\"')
+        text = text:gsub("(%%{"..k.."})", arg)
+    end
+    text = text:gsub("if%s*=%s*'%%{%w+}'", "if=''")
+    text = text:gsub("if%s*=%s*\"%%{%w+}\"", "if=\"\"")
+    -- remove unsolved properties: attr='%{var}'
+    text = text:gsub("%w+%s*=%s*'%%{%w+}'%s?", "")
+    text = text:gsub("%w+%s*=%s*\"%%{%w+}\"%s?", "")
+    return text
+end
+
+session = {
+    entries={}
+}
+
+function session.get_entry(name)
+    local entry = session.entries[name]
+    if entry == nil then
+        entry = {}
+        session.entries[name] = entry
+    end
+    return entry
+end
+
+function session.reset_entry(name)
+    session.entries[name] = nil
+end
+
+function timeit(func, ...)
+    local tm = time.uptime()
+    func(...)
+    print("[time mcs]", (time.uptime()-tm) * 1000000)
+end
+
+function table.has(t, x)
+    for i,v in ipairs(t) do
+        if v == x then
+            return true
+        end
+    end
+    return false
+end
+
+function table.index(t, x)
+    for i,v in ipairs(t) do
+        if v == x then
+            return i
+        end
+    end
+    return -1
+end
+
+function table.remove_value(t, x)
+    local index = table.index(t, x)
+    if index ~= -1 then
+        table.remove(t, index)
+    end
+end
+
+function table.tostring(t)
+    local s = '['
+    for i,v in ipairs(t) do
+        s = s..tostring(v)
+        if i < #t then
+            s = s..', '
+        end
+    end
+    return s..']'
+end
+
+function file.readlines(path)
+    local str = file.read(path)
+    local lines = {}
+    for s in str:gmatch("[^\r\n]+") do
+        table.insert(lines, s)
+    end
+    return lines
+end
+
 -- Deprecated functions
 block_index = block.index
 block_name = block.name
--- a/res/texts/de_DE.txt
+++ b/res/texts/de_DE.txt
@ -0,0 +1,70 @@
+# Общее
+Yes=Ja
+No=Nein
+Ok=OK
+Cancel=Stornieren
+Back=Zurück
+Continue=Weitermachen
+Add=Hinzufügen
+Converting world...=Weltkonvertierung im Gange...
+
+error.pack-not-found=Paket konnte nicht gefunden werden
+error.dependency-not-found=Die verwendete Abhängigkeit wurde nicht gefunden
+pack.remove-confirm=Alle vom Paket bereitgestellten Inhalte (dauerhaft) aus der Welt löschen?
+
+# Меню
+menu.Apply=Anwenden
+menu.Audio=Klang
+menu.Back to Main Menu=Zurück zum Menü
+menu.Content Error=Inhaltsfehler
+menu.Content=Inhalt
+menu.Continue=Weitermachen
+menu.Controls=Kontrolle
+menu.Create World=Erschaffe eine Welt
+menu.missing-content=Fehlender Inhalt!
+menu.New World=Neue Welt
+menu.Quit=Ausfahrt
+menu.Save and Quit to Menu=Speichern und zum Menü zurückkehren
+menu.Settings=Einstellungen
+
+world.Seed=Mais
+world.Name=Name
+world.World generator=Weltgenerator
+world.generators.default=Normal
+world.generators.flat=Wohnung
+world.Create World=Welt Erschaffen
+world.convert-request=Es gibt Änderungen in den Indizes! Die Welt bekehren?
+world.delete-confirm=Die Welt dauerhaft löschen?
+
+# Настройки
+settings.Ambient=Hintergrund
+settings.Backlight=Hintergrundbeleuchtung
+settings.Camera Shaking=Wackelnde Kamera
+settings.Fog Curve=Nebelkurve
+settings.FOV=Sichtlinie
+settings.Language=Sprache
+settings.Load Distance=Ladeentfernung
+settings.Load Speed=Download-Geschwindigkeit
+settings.Master Volume=Allgemeine Lautstärke
+settings.Mouse Sensitivity=Maus-Empfindlichkeit
+settings.Music=Musik
+settings.Regular Sounds=Normale Geräusche
+settings.UI Sounds=Interface-Sounds
+settings.V-Sync=Vertikale Synchronisation
+
+# Управление
+movement.forward=Vorwärts
+movement.back=Zurück
+movement.left=Links
+movement.right=Rechts
+movement.jump=Prallen
+movement.sprint=Beschleunigung
+movement.crouch=Stehlen
+movement.cheat=Schummeln
+hud.inventory=Inventar
+player.pick=Wählen Sie Blockieren
+player.attack=Angriff / Pause
+player.build=Setzen Sie einen Block
+player.flight=Flug
+camera.zoom=Annäherung
+camera.mode=Kameramodus ändern
--- a/res/texts/en_US.txt
+++ b/res/texts/en_US.txt
@ -1,7 +1,7 @@
 # Menu
 menu.missing-content=Missing Content!
 world.convert-request=Content indices have changed! Convert world files?
-pack.remove-confirm=Do you want to erase all pack content from the world forever?
+pack.remove-confirm=Do you want to erase all pack(s) content from the world forever?
 error.pack-not-found=Could not to find pack
 error.dependency-not-found=Dependency pack is not found
 world.delete-confirm=Do you want to delete world forever?
@ -9,6 +9,7 @@ world.generators.default=Default
 world.generators.flat=Flat

 # Bindings
+devtools.console=Console
 movement.forward=Forward
 movement.back=Back
 movement.left=Left
@ -24,4 +25,4 @@ player.build=Place Block
 player.flight=Flight
 player.noclip=No-clip
 camera.zoom=Zoom
-camera.mode=Switch Camera Mode
+camera.mode=Switch Camera Mode
--- a/res/texts/fi_FI.txt
+++ b/res/texts/fi_FI.txt
@ -1,33 +1,39 @@
 # Общее
 Yes=Joo
 No=Ei
-Ok = Kyllä
-Cancel= Hylää
-Back = Takaisin
+Ok=Ok
+Cancel=Hylää
+Back=Takaisin
 Continue=Jatka
+Add=lisätä
+Converting world...=Maailman muuttuminen on käynnissä...

 error.pack-not-found=Pakettia ei löytynyt!
+error.dependency-not-found=Käytetty riippuvuutta ei löytynyt
+pack.remove-confirm=Poistetaanko kaikki pakettien sisältö maailmasta (peruuttamattomasti)?

 # Меню
-menu.New World = Uusi Maailma
+menu.New World=Uusi Maailma
 menu.Quit=Poistu
 menu.Continue=Jatka
 menu.Save and Quit to Menu=Tallenna ja poistu valikkoon
-menu.missing-content=Puuttuu lisäosia!
-menu.Content Error=Lisäosa virhe!
+menu.missing-content=Ei ole sisältöä!
+menu.Content Error=Sisältövirhe
 menu.Controls=Ohjaus
 menu.Back to Main Menu=Takaisin Valikoon
 menu.Settings=Asetukset
-menu.Content=Lisäosat
-menu.Seed=Siemen
-menu.Name=Nimi
+menu.Content=Sisältö
+menu.Audio=Audio
+world.Seed=Siemen
+world.Name=Nimi
+
+world.World generator=Maailman generaattori
+world.generators.default=Tavallinen
+world.generators.flat=Tasainen
 menu.Create World=Luo Maailma

-world.World generator=Valon generaattori
-world.generators.default=Äärimmäinen
-world.generators.flat=Tasainen
-world.convert-request=Indeksit vaihdettu! Lataa maailma uudeleen?
-world.delete-confirm=Poistetaanko maailma ikuisesti?
+world.convert-request=Indeksit ovat muuttuneet! Luodaanko maailma uudeleen?
+world.delete-confirm=Poistetaanko maailma peruuttamattomasti?

 # Настройки
 settings.Load Distance=Latausalue
@ -35,6 +41,12 @@ settings.Load Speed=Latausnopeus
 settings.Fog Curve=Sumun tiheys
 settings.Backlight=Taustavalo
 settings.V-Sync=Pystytahdistus
+settings.Camera Shaking=Kameran tärähdys
+settings.Master Volume=Pää-äänekkyys
+settings.Regular Sounds=Tavalliset äänet
+settings.UI Sounds=Käyttöliittymän äänet
+settings.Ambient=Tausta
+settings.Music=Musiikki

 settings.FOV=Näkökenttä
 settings.Mouse Sensitivity=Hiiren nopeus
--- a/res/texts/langs.json
+++ b/res/texts/langs.json
@ -3,6 +3,9 @@
    	"be_BY": {
            "name": "Беларуская"
        },
+	"de_DE": {
+            "name": "Deutsch"
+        },
        "en_US": {
            "name": "English"
        },
--- a/res/texts/pl_PL.txt
+++ b/res/texts/pl_PL.txt
@ -5,38 +5,53 @@ Ok=OK
 Cancel=Anulowanie
 Back=Powrót
 Continue=Kontynuacja
+Add=Dodać
+Converting world...=Konwersja świata w toku...

 error.pack-not-found=Nie udało się znaleźć pakietu

 # Menu
-menu.New World=Nowy Świat
-menu.Quit=Wyjście
-menu.Continue=Kontynuacja
-menu.Save and Quit to Menu=Zapisz i wyjdź do menu
-menu.missing-content=Brak treści!
-menu.Controls=Zarządzanie
+menu.Apply=Zastosować
+menu.Audio=Dźwięki
 menu.Back to Main Menu=Powrót do menu
-menu.Settings=Ustawienia
 menu.Content=Treść
+menu.Continue=Kontynuacja
+menu.Controls=Zarządzanie
+menu.Graphics=Grafika
+menu.Create World=Stwórz świat
+menu.missing-content=Brakująca treść!
+menu.New World=Nowy Świat
+menu.Page not found=Strona nie znaleziona
+menu.Quit=Wyjście
+menu.Save and Quit to Menu=Zapisz i wyjdź do menu
+menu.Settings=Ustawienia
+
 world.Seed=Ziarno
 world.Name=Nazwa
-menu.Create World=Stwórz świat
-
 world.World generator=Generator światła
 world.generators.default=Ekstremalne
 world.generators.flat=Mieszkanie
+world.Create World=Stwórz świat
 world.convert-request=Szykują się zmiany w indeksach! Przekształcić świat?
+world.delete-confirm=Trwale usunąć świat?

 # Ustawienia
+settings.Ambient=Tło
+settings.Backlight=Podświetlenie
+settings.Camera Shaking=Drżąca kamera
+settings.Fog Curve=Krzywa mgły
+settings.FOV=Wzrok
+settings.Fullscreen=Pełny ekran
+settings.Gamma=Gamma
+settings.Language=Język
 settings.Load Distance=Odległość ładowania
 settings.Load Speed=Prędkość pobierania
-settings.Fog Curve=Krzywa mgły
-settings.Backlight=Podświetlenie
-settings.V-Sync=Synchronizacja pionowa
-
-settings.FOV=Wzrok
+settings.Master Volume=Głośność główna
 settings.Mouse Sensitivity=Wrażliwość myszy
-settings.Language=Język
+settings.Music=Muzyka
+settings.Regular Sounds=Normalne dźwięki
+settings.UI Sounds=Dźwięki interfejsu
+settings.V-Sync=Synchronizacja pionowa

 # Zarządzanie
 movement.forward=Naprzód
--- a/res/texts/ru_RU.txt
+++ b/res/texts/ru_RU.txt
@ -10,49 +10,53 @@ Converting world...=Выполняется конвертация мира...

 error.pack-not-found=Не удалось найти пакет
 error.dependency-not-found=Используемая зависимость не найдена
-pack.remove-confirm=Удалить весь поставляемый паком контент из мира (безвозвратно)?
+pack.remove-confirm=Удалить весь поставляемый паком/паками контент из мира (безвозвратно)?

 # Меню
-menu.New World=Новый Мир
-menu.Quit=Выход
-menu.Continue=Продолжить
-menu.Save and Quit to Menu=Сохранить и Выйти в Меню
-menu.missing-content=Отсутствует Контент!
-menu.Content Error=Ошибка Контента
-menu.Controls=Управление
-menu.Back to Main Menu=Вернуться в Меню
-menu.Settings=Настройки
-menu.Content=Контент
+menu.Apply=Применить
 menu.Audio=Звук
+menu.Back to Main Menu=Вернуться в Меню
+menu.Content Error=Ошибка Контента
+menu.Content=Контент
+menu.Continue=Продолжить
+menu.Controls=Управление
+menu.Graphics=Графика
+menu.missing-content=Отсутствует Контент!
+menu.New World=Новый Мир
+menu.Page not found=Страница не найдена
+menu.Quit=Выход
+menu.Save and Quit to Menu=Сохранить и Выйти в Меню
+menu.Settings=Настройки
+
 world.Seed=Зерно
 world.Name=Название
-
 world.World generator=Генератор мира
 world.generators.default=Обычный
 world.generators.flat=Плоский
-menu.Create World=Создать Мир
-
+world.Create World=Создать Мир
 world.convert-request=Есть изменения в индексах! Конвертировать мир?
 world.delete-confirm=Удалить мир безвозвратно?

 # Настройки
+settings.Ambient=Фон
+settings.Backlight=Подсветка
+settings.Camera Shaking=Тряска Камеры
+settings.Fog Curve=Кривая Тумана
+settings.FOV=Поле Зрения
+settings.Fullscreen=Полный экран
+settings.Gamma=Гамма
+settings.Language=Язык
 settings.Load Distance=Дистанция Загрузки
 settings.Load Speed=Скорость Загрузки
-settings.Fog Curve=Кривая Тумана
-settings.Backlight=Подсветка
-settings.V-Sync=Вертикальная Синхронизация
-settings.Camera Shaking=Тряска Камеры
 settings.Master Volume=Общая Громкость
+settings.Mouse Sensitivity=Чувствительность Мыши
+settings.Music=Музыка
 settings.Regular Sounds=Обычные Звуки
 settings.UI Sounds=Звуки Интерфейса
-settings.Ambient=Фон
-settings.Music=Музыка
-
-settings.FOV=Поле Зрения
-settings.Mouse Sensitivity=Чувствительность Мыши
-settings.Language=Язык
+settings.V-Sync=Вертикальная Синхронизация

 # Управление
+devtools.console=Консоль
 movement.forward=Вперёд
 movement.back=Назад
 movement.left=Влево
@ -67,4 +71,4 @@ player.attack=Атаковать / Сломать
 player.build=Поставить Блок
 player.flight=Полёт
 camera.zoom=Приближение
-camera.mode=Сменить Режим Камеры
+camera.mode=Сменить Режим Камеры
--- a/res/texts/uk_UA.txt
+++ b/res/texts/uk_UA.txt
@ -9,46 +9,48 @@ Add=Додати
 Converting world...=Виконується конвертація світу...

 error.pack-not-found=Не вдалося знайти пакет
-error.dependency-not-found=Використовувана залежність не знайдена
-pack.remove-confirm=Видалити назавжди весь контент, що постачається паком, зі світу?

 # Меню
-menu.New World=Новий Світ
-menu.Quit=Вихід
-menu.Continue=Продовжити
-menu.Save and Quit to Menu=Зберегти і Вийти в Меню
-menu.missing-content=Відсутній Контент!
-menu.Controls=Керування
-menu.Back to Main Menu=Повернутися до Меню
-menu.Settings=Налаштування
-menu.Content=Контент
+menu.Apply=Застосувати
 menu.Audio=Звук
+menu.Back to Main Menu=Повернутися до Меню
+menu.Content Error=Помилка Контенту
+menu.Content=Контент
+menu.Continue=Продовжити
+menu.Controls=Керування
+menu.Graphics=Графіка
+menu.missing-content=Відсутній Контент!
+menu.New World=Новий Світ
+menu.Page not found=Сторінка не знайдена
+menu.Quit=Вихід
+menu.Save and Quit to Menu=Зберегти і Вийти в Меню
+menu.Settings=Налаштування
 world.Seed=Зерно
 world.Name=Назва
 menu.Create World=Створити Світ

 world.World generator=Генератор світу
-world.generators.default=Звичайний
-world.generators.flat=Плоский
+world.generators.default=Звичайні
+world.generators.flat=Плоскі
 world.convert-request=Є зміни в індексах! Конвертувати світ?
-world.delete-confirm=Видалити світ назавжди?

 # Налаштування
+settings.Ambient=Фон
+settings.Backlight=Підсвічування
+settings.Camera Shaking=Тряска Камери
+settings.Fog Curve=Крива Туману
+settings.FOV=Поле зору
+settings.Fullscreen=Повний екран
+settings.Gamma=Гамма
+settings.Language=Мова
 settings.Load Distance=Дистанція Завантаження
 settings.Load Speed=Швидкість Завантаження
-settings.Fog Curve=Крива Туману
-settings.Backlight=Підсвічування
-settings.V-Sync=Вертикальна Синхронізація
-settings.Camera Shaking=Коливання Камери
 settings.Master Volume=Загальна Гучність
-settings.Regular Sounds=Звичайні Звуки
-settings.UI Sounds=Звуки Інтерфейсу
-settings.Ambient=Середовище
-settings.Music=Музика
-
-settings.FOV=Поле зору
 settings.Mouse Sensitivity=Чутливість Миші
-settings.Language=Мова
+settings.Music=Музика
+settings.Regular Sounds=Звичайні Звуки
+settings.UI Sounds=Звуки інтерфейсу
+settings.V-Sync=Вертикальна Синхронізація

 # Керування
 movement.forward=Уперед
--- a/res/textures/gui/circle.png
+++ b/res/textures/gui/circle.png
--- a/res/textures/gui/cross.png
+++ b/res/textures/gui/cross.png
--- a/res/textures/gui/menubg.png
+++ b/res/textures/gui/menubg.png
--- a/res/textures/gui/no_icon.png
+++ b/res/textures/gui/no_icon.png
--- a/res/textures/gui/no_world_icon.png
+++ b/res/textures/gui/no_world_icon.png
--- a/res/textures/gui/refresh.png
+++ b/res/textures/gui/refresh.png
--- a/src/assets/Assets.cpp
+++ b/src/assets/Assets.cpp
@ -1,112 +1,87 @@
-#include "Assets.h"
+#include "Assets.hpp"

-#include "../audio/audio.h"
-#include "../graphics/Texture.h"
-#include "../graphics/Shader.h"
-#include "../graphics/Atlas.h"
-#include "../graphics/Font.h"
-#include "../frontend/UiDocument.h"
-#include "../logic/scripting/scripting.h"
+#include "../audio/audio.hpp"
+#include "../graphics/core/Texture.hpp"
+#include "../graphics/core/Shader.hpp"
+#include "../graphics/core/Atlas.hpp"
+#include "../graphics/core/Font.hpp"
+#include "../frontend/UiDocument.hpp"
+#include "../logic/scripting/scripting.hpp"

 Assets::~Assets() {
 }

 Texture* Assets::getTexture(std::string name) const {
-	auto found = textures.find(name);
-	if (found == textures.end())
-		return nullptr;
-	return found->second.get();
+    auto found = textures.find(name);
+    if (found == textures.end())
+        return nullptr;
+    return found->second.get();
 }

 void Assets::store(Texture* texture, std::string name){
-	textures.emplace(name, texture);
+    textures.emplace(name, texture);
 }


 Shader* Assets::getShader(std::string name) const{
-	auto found = shaders.find(name);
-	if (found == shaders.end())
-		return nullptr;
-	return found->second.get();
+    auto found = shaders.find(name);
+    if (found == shaders.end())
+        return nullptr;
+    return found->second.get();
 }

 void Assets::store(Shader* shader, std::string name){
-	shaders.emplace(name, shader);
+    shaders.emplace(name, shader);
 }

 Font* Assets::getFont(std::string name) const {
-	auto found = fonts.find(name);
-	if (found == fonts.end())
-		return nullptr;
-	return found->second.get();
+    auto found = fonts.find(name);
+    if (found == fonts.end())
+        return nullptr;
+    return found->second.get();
 }

 void Assets::store(Font* font, std::string name){
-	fonts.emplace(name, font);
+    fonts.emplace(name, font);
 }

 Atlas* Assets::getAtlas(std::string name) const {
-	auto found = atlases.find(name);
-	if (found == atlases.end())
-		return nullptr;
-	return found->second.get();
+    auto found = atlases.find(name);
+    if (found == atlases.end())
+        return nullptr;
+    return found->second.get();
 }

 void Assets::store(Atlas* atlas, std::string name){
-	atlases.emplace(name, atlas);
+    atlases.emplace(name, atlas);
 }

 audio::Sound* Assets::getSound(std::string name) const {
-	auto found = sounds.find(name);
-	if (found == sounds.end())
-		return nullptr;
-	return found->second.get();
+    auto found = sounds.find(name);
+    if (found == sounds.end())
+        return nullptr;
+    return found->second.get();
 }

 void Assets::store(audio::Sound* sound, std::string name) {
-	sounds.emplace(name, sound);
+    sounds.emplace(name, sound);
 }

 const std::vector<TextureAnimation>& Assets::getAnimations() {
-	return animations;
+    return animations;
 }

 void Assets::store(const TextureAnimation& animation) {
-	animations.emplace_back(animation);
+    animations.emplace_back(animation);
 }

 UiDocument* Assets::getLayout(std::string name) const {
-	auto found = layouts.find(name);
-	if (found == layouts.end())
-		return nullptr;
-	return found->second.get();
+    auto found = layouts.find(name);
+    if (found == layouts.end())
+        return nullptr;
+    return found->second.get();
 }

 void Assets::store(UiDocument* layout, std::string name) {
-	layouts.emplace(name, layout);
-}
-
-void Assets::extend(const Assets& assets) {
-    for (auto entry : assets.textures) {
-        textures[entry.first] = entry.second;
-    }
-    for (auto entry : assets.shaders) {
-        shaders[entry.first] = entry.second;
-    }
-    for (auto entry : assets.fonts) {
-        fonts[entry.first] = entry.second;
-    }
-    for (auto entry : assets.atlases) {
-        atlases[entry.first] = entry.second;
-    }
-	for (auto entry : assets.layouts) {
-		layouts[entry.first] = entry.second;
-	}
-	for (auto entry : assets.sounds) {
-		sounds[entry.first] = entry.second;
-	}
-    animations.clear();
-	for (auto entry : assets.animations) {
-		animations.emplace_back(entry);
-	}
+    layouts[name] = std::shared_ptr<UiDocument>(layout);
 }
--- a/src/assets/Assets.h
+++ b/src/assets/Assets.h
@ -1,55 +0,0 @@
-#ifndef ASSETS_ASSETS_H_
-#define ASSETS_ASSETS_H_
-
-#include "../graphics/TextureAnimation.h"
-
-#include <string>
-#include <memory>
-#include <unordered_map>
-#include <vector>
-
-class Texture;
-class Shader;
-class Font;
-class Atlas;
-class UiDocument;
-
-namespace audio {
-	class Sound;
-}
-
-class Assets {
-	std::unordered_map<std::string, std::shared_ptr<Texture>> textures;
-	std::unordered_map<std::string, std::shared_ptr<Shader>> shaders;
-	std::unordered_map<std::string, std::shared_ptr<Font>> fonts;
-	std::unordered_map<std::string, std::shared_ptr<Atlas>> atlases;
-	std::unordered_map<std::string, std::shared_ptr<UiDocument>> layouts;
-	std::unordered_map<std::string, std::shared_ptr<audio::Sound>> sounds;
-	std::vector<TextureAnimation> animations;
-public:
-	~Assets();
-	Texture* getTexture(std::string name) const;
-	void store(Texture* texture, std::string name);
-
-	Shader* getShader(std::string name) const;
-	void store(Shader* shader, std::string name);
-
-	Font* getFont(std::string name) const;
-	void store(Font* font, std::string name);
-
-	Atlas* getAtlas(std::string name) const;
-	void store(Atlas* atlas, std::string name);
-
-	audio::Sound* getSound(std::string name) const;
-	void store(audio::Sound* sound, std::string name);
-
-	const std::vector<TextureAnimation>& getAnimations();
-	void store(const TextureAnimation& animation);
-
-	UiDocument* getLayout(std::string name) const;
-	void store(UiDocument* layout, std::string name);
-
-    void extend(const Assets& assets);
-};
-
-#endif /* ASSETS_ASSETS_H_ */
--- a/src/assets/Assets.hpp
+++ b/src/assets/Assets.hpp
@ -0,0 +1,63 @@
+#ifndef ASSETS_ASSETS_HPP_
+#define ASSETS_ASSETS_HPP_
+
+#include "../graphics/core/TextureAnimation.hpp"
+
+#include <string>
+#include <memory>
+#include <functional>
+#include <unordered_map>
+#include <vector>
+
+class Texture;
+class Shader;
+class Font;
+class Atlas;
+class Assets;
+class UiDocument;
+
+namespace audio {
+    class Sound;
+}
+
+namespace assetload {
+    /// @brief final work to do in the main thread
+    using postfunc = std::function<void(Assets*)>;
+}
+
+class Assets {
+    std::unordered_map<std::string, std::shared_ptr<Texture>> textures;
+    std::unordered_map<std::string, std::shared_ptr<Shader>> shaders;
+    std::unordered_map<std::string, std::shared_ptr<Font>> fonts;
+    std::unordered_map<std::string, std::shared_ptr<Atlas>> atlases;
+    std::unordered_map<std::string, std::shared_ptr<UiDocument>> layouts;
+    std::unordered_map<std::string, std::shared_ptr<audio::Sound>> sounds;
+    std::vector<TextureAnimation> animations;
+public:
+    Assets() {}
+    Assets(const Assets&) = delete;
+    ~Assets();
+    
+    Texture* getTexture(std::string name) const;
+    void store(Texture* texture, std::string name);
+
+    Shader* getShader(std::string name) const;
+    void store(Shader* shader, std::string name);
+
+    Font* getFont(std::string name) const;
+    void store(Font* font, std::string name);
+
+    Atlas* getAtlas(std::string name) const;
+    void store(Atlas* atlas, std::string name);
+
+    audio::Sound* getSound(std::string name) const;
+    void store(audio::Sound* sound, std::string name);
+
+    const std::vector<TextureAnimation>& getAnimations();
+    void store(const TextureAnimation& animation);
+
+    UiDocument* getLayout(std::string name) const;
+    void store(UiDocument* layout, std::string name);
+};
+
+#endif // ASSETS_ASSETS_HPP_
--- a/src/assets/AssetsLoader.cpp
+++ b/src/assets/AssetsLoader.cpp
@ -1,58 +1,74 @@
-#include "AssetsLoader.h"
-#include "Assets.h"
+#include "AssetsLoader.hpp"

-#include "assetload_funcs.h"
+#include "Assets.hpp"
+#include "assetload_funcs.hpp"
+#include "../util/ThreadPool.hpp"
+#include "../constants.hpp"
+#include "../data/dynamic.hpp"
+#include "../debug/Logger.hpp"
+#include "../coders/imageio.hpp"
+#include "../files/files.hpp"
+#include "../files/engine_paths.hpp"
+#include "../content/Content.hpp"
+#include "../content/ContentPack.hpp"
+#include "../graphics/core/Texture.hpp"
+#include "../logic/scripting/scripting.hpp"

 #include <iostream>
 #include <memory>

-#include "../constants.h"
-#include "../data/dynamic.h"
-#include "../files/files.h"
-#include "../files/engine_paths.h"
-#include "../content/Content.h"
-#include "../content/ContentPack.h"
-#include "../logic/scripting/scripting.h"
+static debug::Logger logger("assets-loader");

 AssetsLoader::AssetsLoader(Assets* assets, const ResPaths* paths) 
  : assets(assets), paths(paths) 
 {
-	addLoader(AssetType::shader, assetload::shader);
-	addLoader(AssetType::texture, assetload::texture);
-	addLoader(AssetType::font, assetload::font);
-	addLoader(AssetType::atlas, assetload::atlas);
+    addLoader(AssetType::shader, assetload::shader);
+    addLoader(AssetType::texture, assetload::texture);
+    addLoader(AssetType::font, assetload::font);
+    addLoader(AssetType::atlas, assetload::atlas);
    addLoader(AssetType::layout, assetload::layout);
    addLoader(AssetType::sound, assetload::sound);
 }

 void AssetsLoader::addLoader(AssetType tag, aloader_func func) {
-	loaders[tag] = func;
+    loaders[tag] = func;
 }

 void AssetsLoader::add(AssetType tag, const std::string filename, const std::string alias, std::shared_ptr<AssetCfg> settings) {
-	entries.push(aloader_entry{tag, filename, alias, settings});
+    entries.push(aloader_entry{tag, filename, alias, settings});
 }

 bool AssetsLoader::hasNext() const {
-	return !entries.empty();
+    return !entries.empty();
+}
+
+aloader_func AssetsLoader::getLoader(AssetType tag) {
+    auto found = loaders.find(tag);
+    if (found == loaders.end()) {
+        throw std::runtime_error(
+            "unknown asset tag "+std::to_string(static_cast<int>(tag))
+        );
+    }
+    return found->second;
 }

 bool AssetsLoader::loadNext() {
-	const aloader_entry& entry = entries.front();
-	std::cout << "    loading " << entry.filename << " as " << entry.alias << std::endl;
-	std::cout.flush();
-	auto found = loaders.find(entry.tag);
-	if (found == loaders.end()) {
-		std::cerr << "unknown asset tag " << static_cast<int>(entry.tag) << std::endl;
-		return false;
-	}
-	aloader_func loader = found->second;
-	bool status = loader(*this, assets, paths, entry.filename, entry.alias, entry.config);
-	entries.pop();
-	return status;
+    const aloader_entry& entry = entries.front();
+    logger.info() << "loading " << entry.filename << " as " << entry.alias;
+    try {
+        aloader_func loader = getLoader(entry.tag);
+        auto postfunc = loader(this, paths, entry.filename, entry.alias, entry.config);
+        postfunc(assets);
+        entries.pop();
+        return true;
+    } catch (std::runtime_error& err) {
+        logger.error() << err.what();
+        entries.pop();
+        return false;
+    }
 }

-void addLayouts(int env, const std::string& prefix, const fs::path& folder, AssetsLoader& loader) {
+void addLayouts(scriptenv env, const std::string& prefix, const fs::path& folder, AssetsLoader& loader) {
    if (!fs::is_directory(folder)) {
        return;
    }
@ -100,7 +116,7 @@ void AssetsLoader::processPreload(
    switch (tag) {
        case AssetType::sound:
            add(tag, path, name, std::make_shared<SoundCfg>(
-                map->getBool("keep-pcm", false)
+                map->get("keep-pcm", false)
            ));
            break;
        default:
@ -115,13 +131,14 @@ void AssetsLoader::processPreloadList(AssetType tag, dynamic::List* list) {
    }
    for (uint i = 0; i < list->size(); i++) {
        auto value = list->get(i);
-        switch (value->type) {
-            case dynamic::valtype::string:
-                processPreload(tag, *value->value.str, nullptr);
+        switch (static_cast<dynamic::Type>(value.index())) {
+            case dynamic::Type::string:
+                processPreload(tag, std::get<std::string>(value), nullptr);
                break;
-            case dynamic::valtype::map: {
-                auto name = value->value.map->getStr("name");
-                processPreload(tag, name, value->value.map);
+            case dynamic::Type::map: {
+                auto map = std::get<dynamic::Map_sptr>(value);
+                auto name = map->get<std::string>("name");
+                processPreload(tag, name, map.get());
                break;
            }
            default:
@ -161,9 +178,11 @@ void AssetsLoader::addDefaults(AssetsLoader& loader, const Content* content) {
    loader.add(AssetType::texture, TEXTURES_FOLDER+"/gui/menubg", "gui/menubg");
    loader.add(AssetType::texture, TEXTURES_FOLDER+"/gui/delete_icon", "gui/delete_icon");
    loader.add(AssetType::texture, TEXTURES_FOLDER+"/gui/no_icon", "gui/no_icon");
+    loader.add(AssetType::texture, TEXTURES_FOLDER+"/gui/no_world_icon", "gui/no_world_icon");
    loader.add(AssetType::texture, TEXTURES_FOLDER+"/gui/warning", "gui/warning");
    loader.add(AssetType::texture, TEXTURES_FOLDER+"/gui/error", "gui/error");
    loader.add(AssetType::texture, TEXTURES_FOLDER+"/gui/cross", "gui/cross");
+    loader.add(AssetType::texture, TEXTURES_FOLDER+"/gui/refresh", "gui/refresh");
    if (content) {
        loader.processPreloadConfigs(content);

@ -179,13 +198,68 @@ void AssetsLoader::addDefaults(AssetsLoader& loader, const Content* content) {
            auto pack = entry.second.get();
            auto& info = pack->getInfo();
            fs::path folder = info.folder / fs::path("layouts");
-            addLayouts(pack->getEnvironment()->getId(), info.id, folder, loader);
+            addLayouts(pack->getEnvironment(), info.id, folder, loader);
        }
    }
    loader.add(AssetType::atlas, TEXTURES_FOLDER+"/blocks", "blocks");
    loader.add(AssetType::atlas, TEXTURES_FOLDER+"/items", "items");
 }

-const ResPaths* AssetsLoader::getPaths() const {
-	return paths;
+bool AssetsLoader::loadExternalTexture(
+    Assets* assets,
+    const std::string& name,
+    std::vector<std::filesystem::path> alternatives
+) {
+    if (assets->getTexture(name) != nullptr) {
+        return true;
+    }
+    for (auto& path : alternatives) {
+        if (fs::exists(path)) {
+            try {
+                auto image = imageio::read(path.string());
+                assets->store(Texture::from(image.get()).release(), name);
+                return true;
+            } catch (const std::exception& err) {
+                logger.error() << "error while loading external " 
+                    << path.u8string() << ": " << err.what();
+            }
+        }
+    }
+    return false;
+}
+
+const ResPaths* AssetsLoader::getPaths() const {
+    return paths;
+}
+
+class LoaderWorker : public util::Worker<aloader_entry, assetload::postfunc> {
+    AssetsLoader* loader;
+public:
+    LoaderWorker(AssetsLoader* loader) : loader(loader) {
+    }
+
+    assetload::postfunc operator()(const std::shared_ptr<aloader_entry>& entry) override {
+        aloader_func loadfunc = loader->getLoader(entry->tag);
+        return loadfunc(loader, loader->getPaths(), entry->filename, entry->alias, entry->config);
+    }
+};
+
+std::shared_ptr<Task> AssetsLoader::startTask(runnable onDone) {
+    auto pool = std::make_shared<
+        util::ThreadPool<aloader_entry, assetload::postfunc>
+    >(
+        "assets-loader-pool", 
+        [=](){return std::make_shared<LoaderWorker>(this);},
+        [=](assetload::postfunc& func) {
+            func(assets);
+        }
+    );
+    pool->setOnComplete(onDone);
+    while (!entries.empty()) {
+        const aloader_entry& entry = entries.front();
+        auto ptr = std::make_shared<aloader_entry>(entry);
+        pool->enqueueJob(ptr);
+        entries.pop();
+    }
+    return pool;
 }
--- a/src/assets/AssetsLoader.h
+++ b/src/assets/AssetsLoader.h
@ -1,94 +0,0 @@
-#ifndef ASSETS_ASSETS_LOADER_H
-#define ASSETS_ASSETS_LOADER_H
-
-#include <string>
-#include <memory>
-#include <filesystem>
-#include <functional>
-#include <map>
-#include <queue>
-
-namespace dynamic {
-	class Map;
-	class List;
-}
-
-enum class AssetType {
-	texture,
-	shader,
-	font,
-	atlas,
-	layout,
-	sound
-};
-
-class ResPaths;
-class Assets;
-class AssetsLoader;
-class Content;
-
-struct AssetCfg {
-	virtual ~AssetCfg() {}
-};
-
-struct LayoutCfg : AssetCfg {
-    int env;
-
-    LayoutCfg(int env) : env(env) {}
-};
-
-struct SoundCfg : AssetCfg {
-	bool keepPCM;
-	
-	SoundCfg(bool keepPCM) : keepPCM(keepPCM) {}
-};
-
-using aloader_func = std::function<bool(AssetsLoader&, Assets*, const ResPaths*, const std::string&, const std::string&, std::shared_ptr<AssetCfg>)>;
-
-struct aloader_entry {
-	AssetType tag;
-	const std::string filename;
-	const std::string alias;
-    std::shared_ptr<AssetCfg> config;
-};
-
-class AssetsLoader {
-	Assets* assets;
-	std::map<AssetType, aloader_func> loaders;
-	std::queue<aloader_entry> entries;
-	const ResPaths* paths;
-
-    void tryAddSound(std::string name);
-
-	void processPreload(AssetType tag, const std::string& name, dynamic::Map* map);
-	void processPreloadList(AssetType tag, dynamic::List* list);
-	void processPreloadConfig(std::filesystem::path file);
-	void processPreloadConfigs(const Content* content);
-public:
-	AssetsLoader(Assets* assets, const ResPaths* paths);
-	void addLoader(AssetType tag, aloader_func func);
-
-	/// @brief Enqueue asset load
-	/// @param tag asset type
-	/// @param filename asset file path
-	/// @param alias internal asset name
-	/// @param settings asset loading settings (based on asset type)
-	void add(
-        AssetType tag, 
-        const std::string filename, 
-        const std::string alias, 
-        std::shared_ptr<AssetCfg> settings=nullptr
-    );
-	
-	bool hasNext() const;
-	bool loadNext();
-
-	/// @brief Enqueue core and content assets
-	/// @param loader target loader
-	/// @param content engine content
-	static void addDefaults(AssetsLoader& loader, const Content* content);
-
-	const ResPaths* getPaths() const;
-};
-
-#endif // ASSETS_ASSETS_LOADER_H
--- a/src/assets/AssetsLoader.hpp
+++ b/src/assets/AssetsLoader.hpp
@ -0,0 +1,113 @@
+#ifndef ASSETS_ASSETS_LOADER_HPP_
+#define ASSETS_ASSETS_LOADER_HPP_
+
+#include "Assets.hpp"
+#include "../interfaces/Task.hpp"
+#include "../typedefs.hpp"
+#include "../delegates.hpp"
+
+#include <string>
+#include <memory>
+#include <filesystem>
+#include <functional>
+#include <map>
+#include <queue>
+
+namespace dynamic {
+    class Map;
+    class List;
+}
+
+enum class AssetType {
+    texture,
+    shader,
+    font,
+    atlas,
+    layout,
+    sound
+};
+
+class ResPaths;
+class AssetsLoader;
+class Content;
+
+struct AssetCfg {
+    virtual ~AssetCfg() {}
+};
+
+struct LayoutCfg : AssetCfg {
+    scriptenv env;
+
+    LayoutCfg(scriptenv env) : env(env) {}
+};
+
+struct SoundCfg : AssetCfg {
+    bool keepPCM;
+    
+    SoundCfg(bool keepPCM) : keepPCM(keepPCM) {}
+};
+
+using aloader_func = std::function<assetload::postfunc(
+    AssetsLoader*, // redundant?
+    const ResPaths*, 
+    const std::string&, 
+    const std::string&, 
+    std::shared_ptr<AssetCfg>)
+>;
+
+struct aloader_entry {
+    AssetType tag;
+    const std::string filename;
+    const std::string alias;
+    std::shared_ptr<AssetCfg> config;
+};
+
+class AssetsLoader {
+    Assets* assets;
+    std::map<AssetType, aloader_func> loaders;
+    std::queue<aloader_entry> entries;
+    const ResPaths* paths;
+
+    void tryAddSound(std::string name);
+
+    void processPreload(AssetType tag, const std::string& name, dynamic::Map* map);
+    void processPreloadList(AssetType tag, dynamic::List* list);
+    void processPreloadConfig(std::filesystem::path file);
+    void processPreloadConfigs(const Content* content);
+public:
+    AssetsLoader(Assets* assets, const ResPaths* paths);
+    void addLoader(AssetType tag, aloader_func func);
+
+    /// @brief Enqueue asset load
+    /// @param tag asset type
+    /// @param filename asset file path
+    /// @param alias internal asset name
+    /// @param settings asset loading settings (based on asset type)
+    void add(
+        AssetType tag, 
+        const std::string filename, 
+        const std::string alias, 
+        std::shared_ptr<AssetCfg> settings=nullptr
+    );
+    
+    bool hasNext() const;
+    bool loadNext();
+
+    std::shared_ptr<Task> startTask(runnable onDone);
+
+    const ResPaths* getPaths() const;
+    aloader_func getLoader(AssetType tag);
+
+    /// @brief Enqueue core and content assets
+    /// @param loader target loader
+    /// @param content engine content
+    static void addDefaults(AssetsLoader& loader, const Content* content);
+
+    static bool loadExternalTexture(
+        Assets* assets,
+        const std::string& name,
+        std::vector<std::filesystem::path> alternatives
+    );
+};
+
+#endif // ASSETS_ASSETS_LOADER_HPP_
--- a/src/assets/assetload_funcs.cpp
+++ b/src/assets/assetload_funcs.cpp
@ -1,55 +1,54 @@
-#include "assetload_funcs.h"
+#include "assetload_funcs.hpp"
+
+#include "Assets.hpp"
+#include "AssetsLoader.hpp"
+#include "../data/dynamic.hpp"
+#include "../audio/audio.hpp"
+#include "../files/files.hpp"
+#include "../files/engine_paths.hpp"
+#include "../coders/imageio.hpp"
+#include "../coders/json.hpp"
+#include "../coders/GLSLExtension.hpp"
+#include "../graphics/core/Shader.hpp"
+#include "../graphics/core/Texture.hpp"
+#include "../graphics/core/ImageData.hpp"
+#include "../graphics/core/Atlas.hpp"
+#include "../graphics/core/Font.hpp"
+#include "../graphics/core/TextureAnimation.hpp"
+#include "../frontend/UiDocument.hpp"

 #include <iostream>
+#include <stdexcept>
 #include <filesystem>
-#include "Assets.h"
-#include "AssetsLoader.h"
-#include "../audio/audio.h"
-#include "../files/files.h"
-#include "../files/engine_paths.h"
-#include "../coders/png.h"
-#include "../coders/json.h"
-#include "../graphics/Shader.h"
-#include "../graphics/Texture.h"
-#include "../graphics/ImageData.h"
-#include "../graphics/Atlas.h"
-#include "../graphics/Font.h"
-#include "../graphics/TextureAnimation.h"
-#include "../frontend/UiDocument.h"
-#include "../logic/scripting/scripting.h"

 namespace fs = std::filesystem;

 static bool animation(
-    Assets* assets, 
-    const ResPaths* paths, 
-    const std::string directory, 
-    const std::string name,
+    Assets* assets,
+    const ResPaths* paths,
+    const std::string& atlasName,
+    const std::string& directory,
+    const std::string& name,
    Atlas* dstAtlas
 );

-bool assetload::texture(
-    AssetsLoader&,
-    Assets* assets,
+assetload::postfunc assetload::texture(
+    AssetsLoader*,
    const ResPaths* paths,
-    const std::string filename, 
+    const std::string filename,
    const std::string name,
    std::shared_ptr<AssetCfg>
 ) {
-    std::unique_ptr<Texture> texture(
-        png::load_texture(paths->find(filename+".png").u8string())
+    std::shared_ptr<ImageData> image (
+        imageio::read(paths->find(filename+".png").u8string()).release()
    );
-    if (texture == nullptr) {
-        std::cerr << "failed to load texture '" << name << "'" << std::endl;
-        return false;
-    }
-    assets->store(texture.release(), name);
-    return true;
+    return [name, image](auto assets) {
+        assets->store(Texture::from(image.get()).release(), name);
+    };
 }

-bool assetload::shader(
-    AssetsLoader&,
-    Assets* assets,
+assetload::postfunc assetload::shader(
+    AssetsLoader*,
    const ResPaths* paths,
    const std::string filename, 
    const std::string name,
@ -61,43 +60,32 @@ bool assetload::shader(
    std::string vertexSource = files::read_string(vertexFile);
    std::string fragmentSource = files::read_string(fragmentFile);

-    Shader* shader = Shader::create(
-        vertexFile.string(),
-        fragmentFile.string(),
-        vertexSource, fragmentSource
-    );
+    vertexSource = Shader::preprocessor->process(vertexFile, vertexSource);
+    fragmentSource = Shader::preprocessor->process(fragmentFile, fragmentSource);

-    if (shader == nullptr) {
-        std::cerr << "failed to load shader '" << name << "'" << std::endl;
-        return false;
-    }
-    assets->store(shader, name);
-    return true;
+    return [=](auto assets) {
+        assets->store(Shader::create(
+            vertexFile.u8string(),
+            fragmentFile.u8string(),
+            vertexSource, fragmentSource
+        ), name);
+    };
 }

-static bool appendAtlas(AtlasBuilder& atlas, const fs::path& file) {
-    // png is only supported format
-    if (file.extension() != ".png")
-        return false;
+static bool append_atlas(AtlasBuilder& atlas, const fs::path& file) {
    std::string name = file.stem().string();
    // skip duplicates
    if (atlas.has(name)) {
        return false;
    }
-    std::unique_ptr<ImageData> image(png::load_image(file.string()));
-    if (image == nullptr) {
-        std::cerr << "could not to load " << file.string() << std::endl;
-        return false;
-    }
+    auto image = imageio::read(file.string());
    image->fixAlphaColor();
-    atlas.add(name, image.release());
-
+    atlas.add(name, std::move(image));
    return true;
 }

-bool assetload::atlas(
-    AssetsLoader&,
-    Assets* assets, 
+assetload::postfunc assetload::atlas(
+    AssetsLoader*,
    const ResPaths* paths,
    const std::string directory, 
    const std::string name,
@ -105,201 +93,219 @@ bool assetload::atlas(
 ) {
    AtlasBuilder builder;
    for (const auto& file : paths->listdir(directory)) {
-        if (!appendAtlas(builder, file)) continue;
+        if (!imageio::is_read_supported(file.extension().u8string()))
+            continue;
+        if (!append_atlas(builder, file))
+            continue;
    }
-    Atlas* atlas = builder.build(2);
-    assets->store(atlas, name);
-    for (const auto& file : builder.getNames()) {
-        animation(assets, paths, "textures", file, atlas);
-    }
-    return true;
+    std::set<std::string> names = builder.getNames();
+    Atlas* atlas = builder.build(2, false).release();
+    return [=](auto assets) {
+        atlas->prepare();
+        assets->store(atlas, name);
+        for (const auto& file : names) {
+            animation(assets, paths, name, directory, file, atlas);
+        }
+    };
 }

-bool assetload::font(
-    AssetsLoader&,
-    Assets* assets, 
+assetload::postfunc assetload::font(
+    AssetsLoader*,
    const ResPaths* paths,
    const std::string filename, 
    const std::string name,
    std::shared_ptr<AssetCfg>
 ) {
-    std::vector<std::unique_ptr<Texture>> pages;
+    auto pages = std::make_shared<std::vector<std::unique_ptr<ImageData>>>();
    for (size_t i = 0; i <= 4; i++) {
        std::string name = filename + "_" + std::to_string(i) + ".png"; 
        name = paths->find(name).string();
-        std::unique_ptr<Texture> texture (png::load_texture(name));
-        if (texture == nullptr) {
-            std::cerr << "failed to load bitmap font '" << name;
-            std::cerr << "' (missing page " << std::to_string(i) << ")";
-            std::cerr << std::endl;
-            return false;
-        }
-        pages.push_back(std::move(texture));
+        pages->push_back(imageio::read(name));
    }
-    int res = pages[0]->getHeight() / 16;
-    assets->store(new Font(std::move(pages), res, 4), name);
-    return true;
+    return [=](auto assets) {
+        int res = pages->at(0)->getHeight() / 16;
+        std::vector<std::unique_ptr<Texture>> textures;
+        for (auto& page : *pages) {
+            textures.emplace_back(Texture::from(page.get()));
+        }
+        assets->store(new Font(std::move(textures), res, 4), name);
+    };
 }

-bool assetload::layout(
-    AssetsLoader& loader,
-    Assets* assets,
+assetload::postfunc assetload::layout(
+    AssetsLoader*,
    const ResPaths* paths,
    const std::string file,
    const std::string name,
    std::shared_ptr<AssetCfg> config
 ) {
-    try {
-        auto cfg = dynamic_cast<LayoutCfg*>(config.get());
-        auto document = UiDocument::read(loader, cfg->env, name, file);
-        assets->store(document.release(), name);
-        return true;
-    } catch (const parsing_error& err) {
-        std::cerr << "failed to parse layout XML '" << file << "'" << std::endl;
-        std::cerr << err.errorLog() << std::endl;
-        return false;
-    }
+    return [=](auto assets) {
+        try {
+            auto cfg = std::dynamic_pointer_cast<LayoutCfg>(config);
+            auto document = UiDocument::read(cfg->env, name, file);
+            assets->store(document.release(), name);
+        } catch (const parsing_error& err) {
+            throw std::runtime_error(
+                "failed to parse layout XML '"+file+"':\n"+err.errorLog()
+            );
+        }
+    };
 }
-bool assetload::sound(
-    AssetsLoader& loader,
-    Assets* assets,
+assetload::postfunc assetload::sound(
+    AssetsLoader*,
    const ResPaths* paths,
    const std::string file,
    const std::string name,
    std::shared_ptr<AssetCfg> config
 ) {
-    auto cfg = dynamic_cast<SoundCfg*>(config.get());
+    auto cfg = std::dynamic_pointer_cast<SoundCfg>(config);
    bool keepPCM = cfg ? cfg->keepPCM : false;

    std::string extension = ".ogg";
-    try {
-        std::unique_ptr<audio::Sound> baseSound = nullptr;
+    std::unique_ptr<audio::Sound> baseSound = nullptr;

-        // looking for 'sound_name' as base sound
-        auto soundFile = paths->find(file+extension);
-        if (fs::exists(soundFile)) {
-            baseSound.reset(audio::load_sound(soundFile, keepPCM));
-        }
-        // looking for 'sound_name_0' as base sound
-        auto variantFile = paths->find(file+"_0"+extension);
-        if (fs::exists(variantFile)) {
-            baseSound.reset(audio::load_sound(variantFile, keepPCM));
-        }
-
-        // loading sound variants
-        for (uint i = 1; ; i++) {
-            auto variantFile = paths->find(file+"_"+std::to_string(i)+extension);
-            if (!fs::exists(variantFile)) {
-                break;
-            }
-            baseSound->variants.emplace_back(audio::load_sound(variantFile, keepPCM));
-        }
-        assets->store(baseSound.release(), name);
-    } 
-    catch (std::runtime_error& err) {
-        std::cerr << err.what() << std::endl;
-        return false;
+    // looking for 'sound_name' as base sound
+    auto soundFile = paths->find(file+extension);
+    if (fs::exists(soundFile)) {
+        baseSound = audio::load_sound(soundFile, keepPCM);
    }
-    return true;
+    // looking for 'sound_name_0' as base sound
+    auto variantFile = paths->find(file+"_0"+extension);
+    if (fs::exists(variantFile)) {
+        baseSound = audio::load_sound(variantFile, keepPCM);
+    }
+
+    // loading sound variants
+    for (uint i = 1; ; i++) {
+        auto variantFile = paths->find(file+"_"+std::to_string(i)+extension);
+        if (!fs::exists(variantFile)) {
+            break;
+        }
+        baseSound->variants.emplace_back(audio::load_sound(variantFile, keepPCM));
+    }
+
+    if (baseSound == nullptr) {
+        throw std::runtime_error("could not to find sound: " + file);
+    }
+    auto sound = baseSound.release();
+    return [=](auto assets) {
+        assets->store(sound, name);
+    };
+}
+
+static void read_anim_file(
+    const std::string& animFile,
+    std::vector<std::pair<std::string, int>>& frameList
+) {
+    auto root = files::read_json(animFile);
+    auto frameArr = root->list("frames");
+    float frameDuration = DEFAULT_FRAME_DURATION;
+    std::string frameName;
+
+    if (frameArr) {
+        for (size_t i = 0; i < frameArr->size(); i++) {
+            auto currentFrame = frameArr->list(i);
+
+            frameName = currentFrame->str(0);
+            if (currentFrame->size() > 1) {
+                frameDuration = currentFrame->integer(1);
+            }
+            frameList.emplace_back(frameName, frameDuration);
+        }
+    }
+}
+
+static TextureAnimation create_animation(
+    Atlas* srcAtlas,
+    Atlas* dstAtlas,
+    const std::string& name,
+    const std::set<std::string>& frameNames,
+    const std::vector<std::pair<std::string, int>>& frameList
+) {
+    Texture* srcTex = srcAtlas->getTexture();
+    Texture* dstTex = dstAtlas->getTexture();
+    UVRegion region = dstAtlas->get(name);
+
+    TextureAnimation animation(srcTex, dstTex);
+    Frame frame;
+
+    uint dstWidth = dstTex->getWidth();
+    uint dstHeight = dstTex->getHeight();
+
+    uint srcWidth = srcTex->getWidth();
+    uint srcHeight = srcTex->getHeight();
+
+    frame.dstPos = glm::ivec2(region.u1 * dstWidth, region.v1 * dstHeight);
+    frame.size = glm::ivec2(region.u2 * dstWidth, region.v2 * dstHeight) - frame.dstPos;
+
+    for (const auto& elem : frameList) {
+        if (!srcAtlas->has(elem.first)) {
+            std::cerr << "Unknown frame name: " << elem.first << std::endl;
+            continue;
+        }
+        region = srcAtlas->get(elem.first);
+        if (elem.second > 0) {
+            frame.duration = static_cast<float>(elem.second) / 1000.0f;
+        }
+        frame.srcPos = glm::ivec2(region.u1 * srcWidth, srcHeight - region.v2 * srcHeight);
+        animation.addFrame(frame);
+    }
+    return animation;
+}
+
+inline bool contains(
+    const std::vector<std::pair<std::string, int>>& frameList,
+    const std::string& frameName
+) {
+    for (const auto& elem : frameList) {
+        if (frameName == elem.first) {
+            return true;
+        }
+    }
+    return false;
 }

 static bool animation(
    Assets* assets, 
-    const ResPaths* paths, 
-    const std::string directory, 
-    const std::string name,
+    const ResPaths* paths,
+    const std::string& atlasName, 
+    const std::string& directory, 
+    const std::string& name,
    Atlas* dstAtlas
 ) {
-    std::string animsDir = directory + "/animations";
-    std::string blocksDir = directory + "/blocks";
+    std::string animsDir = directory + "/animation";

    for (const auto& folder : paths->listdir(animsDir)) {
        if (!fs::is_directory(folder)) continue;
-        if (folder.filename().string() != name) continue;
+        if (folder.filename().u8string() != name) continue;
        if (fs::is_empty(folder)) continue;
        
        AtlasBuilder builder;
-        appendAtlas(builder, paths->find(blocksDir + "/" + name + ".png"));
-
-        std::string animFile = folder.string() + "/animation.json";
-
-        std::vector<std::pair<std::string, float>> frameList;
+        append_atlas(builder, paths->find(directory + "/" + name + ".png"));

+        std::vector<std::pair<std::string, int>> frameList;
+        std::string animFile = folder.u8string() + "/animation.json";
        if (fs::exists(animFile)) {
-            auto root = files::read_json(animFile);
-
-            auto frameArr = root->list("frames");
-
-            float frameDuration = DEFAULT_FRAME_DURATION;
-            std::string frameName;
-
-            if (frameArr) {
-                for (size_t i = 0; i < frameArr->size(); i++) {
-                    auto currentFrame = frameArr->list(i);
-
-                    frameName = currentFrame->str(0);
-                    if (currentFrame->size() > 1) 
-                        frameDuration = static_cast<float>(currentFrame->integer(1)) / 1000;
-
-                    frameList.emplace_back(frameName, frameDuration);
-                }
-            }
+            read_anim_file(animFile, frameList);
        }
        for (const auto& file : paths->listdir(animsDir + "/" + name)) {
-            if (!frameList.empty()) {
-                bool contains = false;
-                for (const auto& elem : frameList) {
-                    if (file.stem() == elem.first) {
-                        contains = true;
-                        break;
-                    }
-                }
-                if (!contains) continue;
+            if (!frameList.empty() && !contains(frameList, file.stem().u8string())) {
+                continue;
            }
-            if (!appendAtlas(builder, file)) continue;
+            if (!append_atlas(builder, file)) 
+                continue;
        }
-
-        std::unique_ptr<Atlas> srcAtlas (builder.build(2));
-
-        Texture* srcTex = srcAtlas->getTexture();
-        Texture* dstTex = dstAtlas->getTexture();
-
-        TextureAnimation animation(srcTex, dstTex);
-        Frame frame;
-        UVRegion region = dstAtlas->get(name);
-
-        uint dstWidth = dstTex->getWidth();
-        uint dstHeight = dstTex->getHeight();
-
-        uint srcWidth = srcTex->getWidth();
-        uint srcHeight = srcTex->getHeight();
-
-        frame.dstPos = glm::ivec2(region.u1 * dstWidth, region.v1 * dstHeight);
-        frame.size = glm::ivec2(region.u2 * dstWidth, region.v2 * dstHeight) - frame.dstPos;
-
+        auto srcAtlas = builder.build(2, true);
        if (frameList.empty()) {
-            for (const auto& elem : builder.getNames()) {
-                region = srcAtlas->get(elem);
-                frame.srcPos = glm::ivec2(region.u1 * srcWidth, srcHeight - region.v2 * srcHeight);
-                animation.addFrame(frame);
+            for (const auto& frameName : builder.getNames()) {
+                frameList.emplace_back(frameName, 0);
            }
        }
-        else {
-            for (const auto& elem : frameList) {
-                if (!srcAtlas->has(elem.first)) {
-                    std::cerr << "Unknown frame name: " << elem.first << std::endl;
-                    continue;
-                }
-                region = srcAtlas->get(elem.first);
-                frame.duration = elem.second;
-                frame.srcPos = glm::ivec2(region.u1 * srcWidth, srcHeight - region.v2 * srcHeight);
-                animation.addFrame(frame);
-            }
-        }
-
-        assets->store(srcAtlas.release(), name + "_animation");
+        auto animation = create_animation(
+            srcAtlas.get(), dstAtlas, name, builder.getNames(), frameList
+        );
+        assets->store(srcAtlas.release(), atlasName + "/" + name + "_animation");
        assets->store(animation);
-
        return true;
    }
    return true;
--- a/src/assets/assetload_funcs.hpp
+++ b/src/assets/assetload_funcs.hpp
@ -1,5 +1,7 @@
-#ifndef ASSETS_ASSET_LOADERS_H_
-#define ASSETS_ASSET_LOADERS_H_
+#ifndef ASSETS_ASSET_LOADERS_HPP_
+#define ASSETS_ASSET_LOADERS_HPP_
+
+#include "Assets.hpp"

 #include <string>
 #include <memory>
@ -12,50 +14,44 @@ struct AssetCfg;

 /// @brief see AssetsLoader.h: aloader_func
 namespace assetload {
-    bool texture(
-        AssetsLoader&,
-        Assets*, 
+    postfunc texture(
+        AssetsLoader*,
        const ResPaths* paths,
        const std::string filename, 
        const std::string name,
        std::shared_ptr<AssetCfg> settings
    );
-    bool shader(
-        AssetsLoader&,
-        Assets*,
+    postfunc shader(
+        AssetsLoader*,
        const ResPaths* paths,
        const std::string filename, 
        const std::string name,
        std::shared_ptr<AssetCfg> settings
    );
-    bool atlas(
-        AssetsLoader&,
-        Assets*,
+    postfunc atlas(
+        AssetsLoader*,
        const ResPaths* paths, 
        const std::string directory, 
        const std::string name,
        std::shared_ptr<AssetCfg> settings
    );
-    bool font(
-        AssetsLoader&,
-        Assets*, 
+    postfunc font(
+        AssetsLoader*,
        const ResPaths* paths,
        const std::string filename, 
        const std::string name,
        std::shared_ptr<AssetCfg> settings
    );
-    bool layout(
-        AssetsLoader&,
-        Assets*,
+    postfunc layout(
+        AssetsLoader*,
        const ResPaths* paths,
        const std::string file,
        const std::string name,
        std::shared_ptr<AssetCfg> settings
    );

-    bool sound(
-        AssetsLoader&,
-        Assets*,
+    postfunc sound(
+        AssetsLoader*,
        const ResPaths* paths,
        const std::string file,
        const std::string name,
@ -63,4 +59,4 @@ namespace assetload {
    );
 }

-#endif // ASSETS_ASSET_LOADERS_H_
+#endif // ASSETS_ASSET_LOADERS_HPP_
--- a/src/audio/AL/ALAudio.cpp
+++ b/src/audio/AL/ALAudio.cpp
@ -1,7 +1,11 @@
-#include "ALAudio.h"
-#include "alutil.h"
+#include "ALAudio.hpp"
+
+#include "alutil.hpp"
+#include "../../debug/Logger.hpp"
+
 #include <string>
-#include <iostream>
+
+static debug::Logger logger("al-audio");

 using namespace audio;

@ -19,14 +23,14 @@ ALSound::~ALSound() {
    buffer = 0;
 }

-Speaker* ALSound::newInstance(int priority, int channel) const {
+std::unique_ptr<Speaker> ALSound::newInstance(int priority, int channel) const {
    uint source = al->getFreeSource();
    if (source == 0) {
        return nullptr;
    }
    AL_CHECK(alSourcei(source, AL_BUFFER, buffer));

-    auto speaker = new ALSpeaker(al, source, priority, channel);
+    auto speaker = std::make_unique<ALSpeaker>(al, source, priority, channel);
    speaker->duration = duration;
    return speaker;
 }
@ -62,7 +66,7 @@ bool ALStream::preloadBuffer(uint buffer, bool loop) {
    return true;
 }

-Speaker* ALStream::createSpeaker(bool loop, int channel) {
+std::unique_ptr<Speaker> ALStream::createSpeaker(bool loop, int channel) {
    this->loop = loop;
    uint source = al->getFreeSource();
    if (source == 0) {
@ -75,7 +79,7 @@ Speaker* ALStream::createSpeaker(bool loop, int channel) {
        }
        AL_CHECK(alSourceQueueBuffers(source, 1, &buffer));
    }
-    return new ALSpeaker(al, source, PRIORITY_HIGH, channel);
+    return std::make_unique<ALSpeaker>(al, source, PRIORITY_HIGH, channel);
 }


@ -203,10 +207,10 @@ ALSpeaker::~ALSpeaker() {
    }
 }

-void ALSpeaker::update(const Channel* channel, float masterVolume) {
+void ALSpeaker::update(const Channel* channel) {
    if (source == 0)
        return;
-    float gain = this->volume * channel->getVolume()*masterVolume;
+    float gain = this->volume * channel->getVolume();
    AL_CHECK(alSourcef(source, AL_GAIN, gain));
    
    if (!paused) {
@ -259,7 +263,7 @@ void ALSpeaker::play() {
    paused = false;
    stopped = false;
    auto channel = get_channel(this->channel);
-    AL_CHECK(alSourcef(source, AL_GAIN, volume * channel->getVolume()));
+    AL_CHECK(alSourcef(source, AL_GAIN, volume * channel->getVolume() * get_channel(0)->getVolume()));
    AL_CHECK(alSourcePlay(source));
 }

@ -341,14 +345,14 @@ ALAudio::ALAudio(ALCdevice* device, ALCcontext* context)
    alcGetIntegerv(device, ALC_ALL_ATTRIBUTES, size, &attrs[0]);
    for (size_t i = 0; i < attrs.size(); ++i){
       if (attrs[i] == ALC_MONO_SOURCES) {
-          std::cout << "AL: max mono sources: " << attrs[i+1] << std::endl;
+          logger.info() << "max mono sources: " << attrs[i+1];
          maxSources = attrs[i+1];
       }
    }
    auto devices = getAvailableDevices();
-    std::cout << "AL devices:" << std::endl;
+    logger.info() << "devices:";
    for (auto& name : devices) {
-        std::cout << "  " << name << std::endl;
+        logger.info() << "  " << name;
    }
 }

@ -368,21 +372,21 @@ ALAudio::~ALAudio() {
    AL_CHECK(alcMakeContextCurrent(context));
    alcDestroyContext(context);
    if (!alcCloseDevice(device)) {
-        std::cerr << "AL: device not closed!" << std::endl;
+        logger.error() << "device not closed!";
    }
    device = nullptr;
    context = nullptr;
 }

-Sound* ALAudio::createSound(std::shared_ptr<PCM> pcm, bool keepPCM) {
+std::unique_ptr<Sound> ALAudio::createSound(std::shared_ptr<PCM> pcm, bool keepPCM) {
    auto format = AL::to_al_format(pcm->channels, pcm->bitsPerSample);
    uint buffer = getFreeBuffer();
    AL_CHECK(alBufferData(buffer, format, pcm->data.data(), pcm->data.size(), pcm->sampleRate));
-    return new ALSound(this, buffer, pcm, keepPCM);
+    return std::make_unique<ALSound>(this, buffer, pcm, keepPCM);
 }

-Stream* ALAudio::openStream(std::shared_ptr<PCMStream> stream, bool keepSource) {
-    return new ALStream(this, stream, keepSource);
+std::unique_ptr<Stream> ALAudio::openStream(std::shared_ptr<PCMStream> stream, bool keepSource) {
+    return std::make_unique<ALStream>(this, stream, keepSource);
 }

 ALAudio* ALAudio::create() {
@ -395,7 +399,7 @@ ALAudio* ALAudio::create() {
        return nullptr;
    }
    AL_CHECK();
-    std::cout << "AL: initialized" << std::endl;
+    logger.info() << "initialized";
    return new ALAudio(device, context);
 }

@ -406,7 +410,7 @@ uint ALAudio::getFreeSource(){
        return source;
    }
    if (allsources.size() == maxSources){
-        std::cerr << "attempted to create new source, but limit is " << maxSources << std::endl;
+        logger.error() << "attempted to create new source, but limit is " << maxSources;
        return 0;
    }
    ALuint id;
@ -467,7 +471,8 @@ void ALAudio::setListener(glm::vec3 position, glm::vec3 velocity, glm::vec3 at,
    AL_CHECK(alListener3f(AL_POSITION, position.x, position.y, position.z));
    AL_CHECK(alListener3f(AL_VELOCITY, velocity.x, velocity.y, velocity.z));
    AL_CHECK(alListenerfv(AL_ORIENTATION, listenerOri));
+    AL_CHECK(alListenerf(AL_GAIN, get_channel(0)->getVolume()));
 }

-void ALAudio::update(double delta) {
+void ALAudio::update(double) {
 }
--- a/src/audio/AL/ALAudio.hpp
+++ b/src/audio/AL/ALAudio.hpp
@ -1,5 +1,8 @@
-#ifndef SRC_AUDIO_AUDIO_H_
-#define SRC_AUDIO_AUDIO_H_
+#ifndef SRC_AUDIO_AUDIO_HPP_
+#define SRC_AUDIO_AUDIO_HPP_
+
+#include "../audio.hpp"
+#include "../../typedefs.hpp"

 #include <queue>
 #include <vector>
@ -15,9 +18,6 @@
 #include <AL/alc.h>
 #endif

-#include "../audio.h"
-#include "../../typedefs.h"
-
 namespace audio {
    struct ALBuffer;
    class ALAudio;
@ -40,7 +40,7 @@ namespace audio {
            return pcm;
        }

-        Speaker* newInstance(int priority, int channel) const override;
+        std::unique_ptr<Speaker> newInstance(int priority, int channel) const override;
    };

    class ALStream : public Stream {
@ -65,7 +65,7 @@ namespace audio {

        std::shared_ptr<PCMStream> getSource() const override;
        void bindSpeaker(speakerid_t speaker) override;
-        Speaker* createSpeaker(bool loop, int channel) override;
+        std::unique_ptr<Speaker> createSpeaker(bool loop, int channel) override;
        speakerid_t getSpeaker() const override;
        void update(double delta) override;
        
@ -91,7 +91,7 @@ namespace audio {
        ALSpeaker(ALAudio* al, uint source, int priority, int channel);
        ~ALSpeaker();

-        void update(const Channel* channel, float masterVolume) override;
+        void update(const Channel* channel) override;
        int getChannel() const override;

        State getState() const override;
@ -135,7 +135,7 @@ namespace audio {
        std::vector<uint> allbuffers;
        std::vector<uint> freebuffers;

-        uint maxSources;
+        uint maxSources = 256;

        ALAudio(ALCdevice* device, ALCcontext* context);
    public:
@ -148,8 +148,8 @@ namespace audio {

        std::vector<std::string> getAvailableDevices() const;

-        Sound* createSound(std::shared_ptr<PCM> pcm, bool keepPCM) override;
-        Stream* openStream(std::shared_ptr<PCMStream> stream, bool keepSource) override;
+        std::unique_ptr<Sound> createSound(std::shared_ptr<PCM> pcm, bool keepPCM) override;
+        std::unique_ptr<Stream> openStream(std::shared_ptr<PCMStream> stream, bool keepSource) override;

        void setListener(
            glm::vec3 position,
@ -168,4 +168,4 @@ namespace audio {
    };
 }

-#endif /* SRC_AUDIO_AUDIO_H_ */
+#endif // SRC_AUDIO_AUDIO_HPP_
--- a/src/audio/AL/alutil.cpp
+++ b/src/audio/AL/alutil.cpp
@ -1,6 +1,7 @@
-#include "alutil.h"
+#include "alutil.hpp"
+
+#include "../../debug/Logger.hpp"

-#include <iostream>
 #include <fstream>
 #include <cstring>
 #include <memory>
@ -14,30 +15,31 @@
 #include <AL/alc.h>
 #endif

+static debug::Logger logger("open-al");
+
 bool AL::check_errors(const std::string& filename, const std::uint_fast32_t line){
    ALenum error = alGetError();
    if(error != AL_NO_ERROR){
-        std::cerr << "OpenAL ERROR (" << filename << ": " << line << ")\n" ;
+        logger.error() << filename << ": " << line;
        switch(error){
        case AL_INVALID_NAME:
-            std::cerr << "AL_INVALID_NAME: a bad name (ID) was passed to an OpenAL function";
+            logger.error() << "a bad name (ID) was passed to an OpenAL function";
            break;
        case AL_INVALID_ENUM:
-            std::cerr << "AL_INVALID_ENUM: an invalid enum value was passed to an OpenAL function";
+            logger.error() << "an invalid enum value was passed to an OpenAL function";
            break;
        case AL_INVALID_VALUE:
-            std::cerr << "AL_INVALID_VALUE: an invalid value was passed to an OpenAL function";
+            logger.error() << "an invalid value was passed to an OpenAL function";
            break;
        case AL_INVALID_OPERATION:
-            std::cerr << "AL_INVALID_OPERATION: the requested operation is not valid";
+            logger.error() << "the requested operation is not valid";
            break;
        case AL_OUT_OF_MEMORY:
-            std::cerr << "AL_OUT_OF_MEMORY: the requested operation resulted in OpenAL running out of memory";
+            logger.error() << "the requested operation resulted in OpenAL running out of memory";
            break;
        default:
-            std::cerr << "UNKNOWN AL ERROR: " << error;
+            logger.error() << "UNKNOWN AL ERROR: " << error;
        }
-        std::cerr << std::endl;
        return false;
    }
    return true;
--- a/src/audio/AL/alutil.hpp
+++ b/src/audio/AL/alutil.hpp
@ -1,5 +1,7 @@
-#ifndef SRC_AUDIO_AUDIOUTIL_H_
-#define SRC_AUDIO_AUDIOUTIL_H_
+#ifndef AUDIO_AUDIOUTIL_HPP_
+#define AUDIO_AUDIOUTIL_HPP_
+
+#include "../../typedefs.hpp"

 #include <string>
 #include <type_traits>
@ -12,7 +14,6 @@
 #endif

 #include <glm/glm.hpp>
-#include "../../typedefs.h"

 #define AL_CHECK(STATEMENT) STATEMENT; AL::check_errors(__FILE__, __LINE__)
 #define AL_GET_ERROR() AL::check_errors(__FILE__, __LINE__)
@ -80,4 +81,4 @@ namespace AL {
    }
 }

-#endif /* SRC_AUDIO_AUDIOUTIL_H_ */
+#endif // AUDIO_AUDIOUTIL_HPP_
--- a/src/audio/NoAudio.cpp
+++ b/src/audio/NoAudio.cpp
@ -1,4 +1,4 @@
-#include "NoAudio.h"
+#include "NoAudio.hpp"

 using namespace audio;

@ -9,12 +9,12 @@ NoSound::NoSound(std::shared_ptr<PCM> pcm, bool keepPCM) {
    }
 }

-Sound* NoAudio::createSound(std::shared_ptr<PCM> pcm, bool keepPCM) {
-    return new NoSound(pcm, keepPCM);
+std::unique_ptr<Sound> NoAudio::createSound(std::shared_ptr<PCM> pcm, bool keepPCM) {
+    return std::make_unique<NoSound>(pcm, keepPCM);
 }

-Stream* NoAudio::openStream(std::shared_ptr<PCMStream> stream, bool keepSource) {
-    return new NoStream(stream, keepSource);
+std::unique_ptr<Stream> NoAudio::openStream(std::shared_ptr<PCMStream> stream, bool keepSource) {
+    return std::make_unique<NoStream>(stream, keepSource);
 }

 NoAudio* NoAudio::create() {
--- a/src/audio/NoAudio.hpp
+++ b/src/audio/NoAudio.hpp
@ -1,7 +1,7 @@
-#ifndef AUDIO_NOAUDIO_H_
-#define AUDIO_NOAUDIO_H_
+#ifndef AUDIO_NOAUDIO_HPP_
+#define AUDIO_NOAUDIO_HPP_

-#include "audio.h"
+#include "audio.hpp"

 namespace audio {
    class NoSound : public Sound {
@ -19,7 +19,7 @@ namespace audio {
            return pcm;
        }

-        Speaker* newInstance(int priority, int channel) const override {
+        std::unique_ptr<Speaker> newInstance(int priority, int channel) const override {
            return nullptr;
        }
    };
@ -42,7 +42,7 @@ namespace audio {
        void bindSpeaker(speakerid_t speaker) override {
        }

-        Speaker* createSpeaker(bool loop, int channel) override{
+        std::unique_ptr<Speaker> createSpeaker(bool loop, int channel) override {
            return nullptr;
        }

@ -65,8 +65,8 @@ namespace audio {
    public:
        ~NoAudio() {}

-        Sound* createSound(std::shared_ptr<PCM> pcm, bool keepPCM) override;
-        Stream* openStream(std::shared_ptr<PCMStream> stream, bool keepSource) override;
+        std::unique_ptr<Sound> createSound(std::shared_ptr<PCM> pcm, bool keepPCM) override;
+        std::unique_ptr<Stream> openStream(std::shared_ptr<PCMStream> stream, bool keepSource) override;

        void setListener(
            glm::vec3 position,
@ -85,4 +85,4 @@ namespace audio {
    };
 }

-#endif // AUDIO_NOAUDIO_H_
+#endif // AUDIO_NOAUDIO_HPP_
--- a/src/audio/audio.cpp
+++ b/src/audio/audio.cpp
@ -1,14 +1,14 @@
-#include "audio.h"
+#include "audio.hpp"
+
+#include "NoAudio.hpp"
+#include "AL/ALAudio.hpp"
+
+#include "../coders/wav.hpp"
+#include "../coders/ogg.hpp"

 #include <iostream>
 #include <stdexcept>

-#include "NoAudio.h"
-#include "AL/ALAudio.h"
-
-#include "../coders/wav.h"
-#include "../coders/ogg.h"
-
 namespace audio {
    static speakerid_t nextId = 1;
    static Backend* backend;
@ -72,9 +72,6 @@ size_t PCMStream::readFully(char* buffer, size_t bufferSize, bool loop) {
        if (loop) {
            seek(0);
        }
-        if (bufferSize == 0) {
-            return size;
-        }
    } while (loop);
    return size;
 }
@ -94,7 +91,7 @@ public:
      seekable(seekable) 
    {}

-    size_t read(char* buffer, size_t bufferSize) override {
+    size_t read(char*, size_t bufferSize) override {
        if (closed) {
            return 0;
        }
@ -159,7 +156,7 @@ void audio::initialize(bool enabled) {
    create_channel("master");
 }

-PCM* audio::load_PCM(const fs::path& file, bool headerOnly) {
+std::unique_ptr<PCM> audio::load_PCM(const fs::path& file, bool headerOnly) {
    if (!fs::exists(file)) {
        throw std::runtime_error("file not found '"+file.u8string()+"'");
    }
@ -172,16 +169,16 @@ PCM* audio::load_PCM(const fs::path& file, bool headerOnly) {
    throw std::runtime_error("unsupported audio format");
 }

-Sound* audio::load_sound(const fs::path& file, bool keepPCM) {
-    std::shared_ptr<PCM> pcm(load_PCM(file, !keepPCM && backend->isDummy()));
+std::unique_ptr<Sound> audio::load_sound(const fs::path& file, bool keepPCM) {
+    std::shared_ptr<PCM> pcm(load_PCM(file, !keepPCM && backend->isDummy()).release());
    return create_sound(pcm, keepPCM);
 }

-Sound* audio::create_sound(std::shared_ptr<PCM> pcm, bool keepPCM) {
+std::unique_ptr<Sound> audio::create_sound(std::shared_ptr<PCM> pcm, bool keepPCM) {
    return backend->createSound(pcm, keepPCM);
 }

-PCMStream* audio::open_PCM_stream(const fs::path& file) {
+std::unique_ptr<PCMStream> audio::open_PCM_stream(const fs::path& file) {
    std::string ext = file.extension().u8string();
    if (ext == ".wav" || ext == ".WAV") {
        return wav::create_stream(file);
@ -191,7 +188,7 @@ PCMStream* audio::open_PCM_stream(const fs::path& file) {
    throw std::runtime_error("unsupported audio stream format");
 }

-Stream* audio::open_stream(const fs::path& file, bool keepSource) {
+std::unique_ptr<Stream> audio::open_stream(const fs::path& file, bool keepSource) {
    if (!keepSource && backend->isDummy()) {
        auto header = load_PCM(file, true);
        // using void source sized as audio instead of actual audio file
@ -206,7 +203,7 @@ Stream* audio::open_stream(const fs::path& file, bool keepSource) {
    );
 }

-Stream* audio::open_stream(std::shared_ptr<PCMStream> stream, bool keepSource) {
+std::unique_ptr<Stream> audio::open_stream(std::shared_ptr<PCMStream> stream, bool keepSource) {
    return backend->openStream(stream, keepSource);
 }

@ -258,16 +255,17 @@ speakerid_t audio::play(
            sound = sound->variants.at(index).get();
        }
    }
-    Speaker* speaker = sound->newInstance(priority, channel);
-    if (speaker == nullptr) {
+    auto speaker_ptr = sound->newInstance(priority, channel);
+    if (speaker_ptr == nullptr) {
        remove_lower_priority_speaker(priority);
-        speaker = sound->newInstance(priority, channel);
+        speaker_ptr = sound->newInstance(priority, channel);
    }
-    if (speaker == nullptr) {
+    if (speaker_ptr == nullptr) {
        return 0;
    }
+    auto speaker = speaker_ptr.get();
    speakerid_t id = nextId++;
-    speakers.emplace(id, speaker);
+    speakers.emplace(id, std::move(speaker_ptr));
    speaker->setPosition(position);
    speaker->setVolume(volume);
    speaker->setPitch(pitch);
@ -286,17 +284,18 @@ speakerid_t audio::play(
    bool loop,
    int channel
 ) {
-    Speaker* speaker = stream->createSpeaker(loop, channel);
-    if (speaker == nullptr) {
+    auto speaker_ptr = stream->createSpeaker(loop, channel);
+    if (speaker_ptr == nullptr) {
        remove_lower_priority_speaker(PRIORITY_HIGH);
-        speaker = stream->createSpeaker(loop, channel);
+        speaker_ptr = stream->createSpeaker(loop, channel);
    }
-    if (speaker == nullptr) {
+    if (speaker_ptr == nullptr) {
        return 0;
    }
+    auto speaker = speaker_ptr.get();
    speakerid_t id = nextId++;
    streams.emplace(id, stream);
-    speakers.emplace(id, speaker);
+    speakers.emplace(id, std::move(speaker_ptr));
    stream->bindSpeaker(id);

    speaker->setPosition(position);
@ -383,13 +382,12 @@ void audio::update(double delta) {
        entry.second->update(delta);
    }

-    float masterVolume = channels.at(0)->getVolume();
    for (auto it = speakers.begin(); it != speakers.end();) {
        auto speaker = it->second.get();
        int speakerChannel = speaker->getChannel();
        auto channel = get_channel(speakerChannel);
        if (channel != nullptr) {
-            speaker->update(channel, speakerChannel == 0 ? 1.0f : masterVolume);
+            speaker->update(channel);
        }
        if (speaker->isStopped()) {
            streams.erase(it->first);
--- a/src/audio/audio.hpp
+++ b/src/audio/audio.hpp
@ -1,11 +1,12 @@
-#ifndef AUDIO_AUDIO_H_
-#define AUDIO_AUDIO_H_
+#ifndef AUDIO_AUDIO_HPP_
+#define AUDIO_AUDIO_HPP_
+
+#include "../typedefs.hpp"

 #include <vector>
 #include <memory>
 #include <filesystem>
 #include <glm/glm.hpp>
-#include "../typedefs.h"

 namespace fs = std::filesystem;

@ -178,7 +179,7 @@ namespace audio {
        /// @param loop is stream looped (required for correct buffers preload)
        /// @param channel channel index
        /// @return speaker id or 0
-        virtual Speaker* createSpeaker(bool loop, int channel) = 0;
+        virtual std::unique_ptr<Speaker> createSpeaker(bool loop, int channel) = 0;

        /// @brief Unbind previous speaker and bind new speaker to the stream
        /// @param speaker speaker id or 0 if all you need is unbind speaker
@ -224,7 +225,7 @@ namespace audio {
        /// @param channel channel index
        /// @return new speaker with sound bound or nullptr 
        /// if all speakers are in use
-        virtual Speaker* newInstance(int priority, int channel) const = 0;
+        virtual std::unique_ptr<Speaker> newInstance(int priority, int channel) const = 0;
    };

    /// @brief Audio source controller interface.
@ -235,8 +236,7 @@ namespace audio {

        /// @brief Synchronize the speaker with channel settings
        /// @param channel speaker channel
-        /// @param masterVolume volume of the master channel
-        virtual void update(const Channel* channel, float masterVolume) = 0;
+        virtual void update(const Channel* channel) = 0;

        /// @brief Check speaker channel index
        virtual int getChannel() const = 0;
@ -336,8 +336,8 @@ namespace audio {
    public:
        virtual ~Backend() {};

-        virtual Sound* createSound(std::shared_ptr<PCM> pcm, bool keepPCM) = 0;
-        virtual Stream* openStream(std::shared_ptr<PCMStream> stream, bool keepSource) = 0;
+        virtual std::unique_ptr<Sound> createSound(std::shared_ptr<PCM> pcm, bool keepPCM) = 0;
+        virtual std::unique_ptr<Stream> openStream(std::shared_ptr<PCMStream> stream, bool keepSource) = 0;
        virtual void setListener(
            glm::vec3 position, 
            glm::vec3 velocity, 
@ -353,52 +353,52 @@ namespace audio {

    /// @brief Initialize audio system or use no audio mode
    /// @param enabled try to initialize actual audio
-    extern void initialize(bool enabled);
+    void initialize(bool enabled);

    /// @brief Load audio file info and PCM data
    /// @param file audio file
    /// @param headerOnly read header only
    /// @throws std::runtime_error if I/O error ocurred or format is unknown 
    /// @return PCM audio data
-    extern PCM* load_PCM(const fs::path& file, bool headerOnly);
+    std::unique_ptr<PCM> load_PCM(const fs::path& file, bool headerOnly);

    /// @brief Load sound from file
    /// @param file audio file path
    /// @param keepPCM store PCM data in sound to make it accessible with Sound::getPCM
    /// @throws std::runtime_error if I/O error ocurred or format is unknown 
    /// @return new Sound instance
-    extern Sound* load_sound(const fs::path& file, bool keepPCM);
+    std::unique_ptr<Sound> load_sound(const fs::path& file, bool keepPCM);

    /// @brief Create new sound from PCM data
    /// @param pcm PCM data
    /// @param keepPCM store PCM data in sound to make it accessible with Sound::getPCM
    /// @return new Sound instance 
-    extern Sound* create_sound(std::shared_ptr<PCM> pcm, bool keepPCM);
+    std::unique_ptr<Sound> create_sound(std::shared_ptr<PCM> pcm, bool keepPCM);

    /// @brief Open new PCM stream from file
    /// @param file audio file path
    /// @throws std::runtime_error if I/O error ocurred or format is unknown
    /// @return new PCMStream instance
-    extern PCMStream* open_PCM_stream(const fs::path& file);
+    std::unique_ptr<PCMStream> open_PCM_stream(const fs::path& file);

    /// @brief Open new audio stream from file
    /// @param file audio file path
    /// @param keepSource store PCMStream in stream to make it accessible with Stream::getSource
    /// @return new Stream instance
-    extern Stream* open_stream(const fs::path& file, bool keepSource);
+    std::unique_ptr<Stream> open_stream(const fs::path& file, bool keepSource);

    /// @brief Open new audio stream from source
    /// @param stream PCM data source
    /// @param keepSource store PCMStream in stream to make it accessible with Stream::getSource
    /// @return new Stream instance
-    extern Stream* open_stream(std::shared_ptr<PCMStream> stream, bool keepSource);
+    std::unique_ptr<Stream> open_stream(std::shared_ptr<PCMStream> stream, bool keepSource);

    /// @brief Configure 3D listener
    /// @param position listener position
    /// @param velocity listener velocity (used for Doppler effect)
    /// @param lookAt point the listener look at
    /// @param up camera up vector
-    extern void set_listener(
+    void set_listener(
        glm::vec3 position, 
        glm::vec3 velocity, 
        glm::vec3 lookAt, 
@ -416,7 +416,7 @@ namespace audio {
    /// (PRIORITY_LOW, PRIORITY_NORMAL, PRIORITY_HIGH)
    /// @param channel channel index
    /// @return speaker id or 0
-    extern speakerid_t play(
+    speakerid_t play(
        Sound* sound,
        glm::vec3 position,
        bool relative,
@ -436,7 +436,7 @@ namespace audio {
    /// @param loop loop stream
    /// @param channel channel index
    /// @return speaker id or 0
-    extern speakerid_t play(
+    speakerid_t play(
        std::shared_ptr<Stream> stream,
        glm::vec3 position,
        bool relative,
@ -455,7 +455,7 @@ namespace audio {
    /// @param loop loop stream
    /// @param channel channel index
    /// @return speaker id or 0
-    extern speakerid_t play_stream(
+    speakerid_t play_stream(
        const fs::path& file,
        glm::vec3 position,
        bool relative,
@ -468,49 +468,49 @@ namespace audio {
    /// @brief Get speaker by id
    /// @param id speaker id
    /// @return speaker or nullptr
-    extern Speaker* get_speaker(speakerid_t id);
+    Speaker* get_speaker(speakerid_t id);

    /// @brief Create new channel. 
    /// All non-builtin channels will be destroyed on audio::reset() call
    /// @param name channel name
    /// @return new channel index
-    extern int create_channel(const std::string& name);
+    int create_channel(const std::string& name);

    /// @brief Get channel index by name
    /// @param name channel name
    /// @return channel index or -1
-    extern int get_channel_index(const std::string& name);
+    int get_channel_index(const std::string& name);

    /// @brief Get channel by index. 0 - is master channel
    /// @param index channel index
    /// @return channel or nullptr
-    extern Channel* get_channel(int index);
+    Channel* get_channel(int index);

    /// @brief Get channel by name.
    /// @param name channel name
    /// @return channel or nullptr
-    extern Channel* get_channel(const std::string& name);
+    Channel* get_channel(const std::string& name);

    /// @brief Get stream associated with speaker
    /// @param id speaker id
    /// @return stream or nullptr
-    extern std::shared_ptr<Stream> get_associated_stream(speakerid_t id);
+    std::shared_ptr<Stream> get_associated_stream(speakerid_t id);

    /// @brief Get alive speakers number (including paused)
-    extern size_t count_speakers();
+    size_t count_speakers();

    /// @brief Get playing streams number (including paused) 
-    extern size_t count_streams();
+    size_t count_streams();

    /// @brief Update audio streams and sound instanced
    /// @param delta time elapsed since the last update (seconds)
-    extern void update(double delta);
+    void update(double delta);

    /// @brief Stop all playing audio in channel, reset channel state
-    extern void reset_channel(int channel);
+    void reset_channel(int channel);
    
    /// @brief Finalize audio system
-    extern void close();
+    void close();
 };

-#endif // AUDIO_AUDIO_H_
+#endif // AUDIO_AUDIO_HPP_
--- a/src/coders/GLSLExtension.cpp
+++ b/src/coders/GLSLExtension.cpp
@ -1,11 +1,13 @@
-#include "GLSLExtension.h"
+#include "GLSLExtension.hpp"
+
+#include "../util/stringutil.hpp"
+#include "../typedefs.hpp"
+#include "../files/files.hpp"
+#include "../files/engine_paths.hpp"
+
 #include <iostream>
 #include <sstream>
 #include <stdexcept>
-#include "../util/stringutil.h"
-#include "../typedefs.h"
-#include "../files/files.h"
-#include "../files/engine_paths.h"

 namespace fs = std::filesystem;

@ -81,7 +83,7 @@ inline void source_line(std::stringstream& ss, uint linenum) {
    ss << "#line " << linenum << "\n";
 }

-const std::string GLSLExtension::process(const fs::path file, const std::string& source) {
+const std::string GLSLExtension::process(const fs::path& file, const std::string& source) {
    std::stringstream ss;
    size_t pos = 0;
    uint linenum = 1;
--- a/src/coders/GLSLExtension.hpp
+++ b/src/coders/GLSLExtension.hpp
@ -1,5 +1,5 @@
-#ifndef CODERS_GLSL_EXTESION_H_
-#define CODERS_GLSL_EXTESION_H_
+#ifndef CODERS_GLSL_EXTESION_HPP_
+#define CODERS_GLSL_EXTESION_HPP_

 #include <string>
 #include <vector>
@ -29,7 +29,10 @@ public:
    bool hasHeader(const std::string& name) const;
    bool hasDefine(const std::string& name) const;

-    const std::string process(const std::filesystem::path file, const std::string& source);
+    const std::string process(
+        const std::filesystem::path& file, 
+        const std::string& source
+    );
 };

-#endif // CODERS_GLSL_EXTESION_H_
+#endif // CODERS_GLSL_EXTESION_HPP_
--- a/src/coders/binary_json.cpp
+++ b/src/coders/binary_json.cpp
@ -1,29 +1,32 @@
-#include "binary_json.h"
+#include "binary_json.hpp"
+
+#include "gzip.hpp"
+#include "byte_utils.hpp"
+#include "../data/dynamic.hpp"

 #include <stdexcept>

-#include "gzip.h"
-#include "byte_utils.h"
-
 using namespace json;
 using namespace dynamic;

-static void to_binary(ByteBuilder& builder, const Value* value) {
-    switch (value->type) {
-        case valtype::map: {
-            std::vector<ubyte> bytes = to_binary(value->value.map);
+static void to_binary(ByteBuilder& builder, const Value& value) {
+    switch (static_cast<Type>(value.index())) {
+        case Type::none:
+            throw std::runtime_error("none value is not implemented");
+        case Type::map: {
+            auto bytes = to_binary(std::get<Map_sptr>(value).get());
            builder.put(bytes.data(), bytes.size());
            break;
        }
-        case valtype::list:
+        case Type::list:
            builder.put(BJSON_TYPE_LIST);
-            for (auto& element : value->value.list->values) {
-                to_binary(builder, element.get());
+            for (auto& element : std::get<List_sptr>(value)->values) {
+                to_binary(builder, element);
            }
            builder.put(BJSON_END);
            break;
-        case valtype::integer: {
-            int64_t val = value->value.integer;
+        case Type::integer: {
+            auto val = std::get<integer_t>(value);
            if (val >= 0 && val <= 255) {
                builder.put(BJSON_TYPE_BYTE);
                builder.put(val);
@ -39,22 +42,22 @@ static void to_binary(ByteBuilder& builder, const Value* value) {
            }
            break;
        }
-        case valtype::number:
+        case Type::number:
            builder.put(BJSON_TYPE_NUMBER);
-            builder.putFloat64(value->value.decimal);
+            builder.putFloat64(std::get<number_t>(value));
            break;
-        case valtype::boolean:
-            builder.put(BJSON_TYPE_FALSE + value->value.boolean);
+        case Type::boolean:
+            builder.put(BJSON_TYPE_FALSE + std::get<bool>(value));
            break;
-        case valtype::string:
+        case Type::string:
            builder.put(BJSON_TYPE_STRING);
-            builder.put(*value->value.str);
+            builder.put(std::get<std::string>(value));
            break;
    }
 }

-static List* array_from_binary(ByteReader& reader);
-static Map* object_from_binary(ByteReader& reader);
+static std::unique_ptr<List> array_from_binary(ByteReader& reader);
+static std::unique_ptr<Map> object_from_binary(ByteReader& reader);

 std::vector<ubyte> json::to_binary(const Map* obj, bool compress) {
    if (compress) {
@ -70,7 +73,7 @@ std::vector<ubyte> json::to_binary(const Map* obj, bool compress) {
    // writing entries
    for (auto& entry : obj->values) {
        builder.putCStr(entry.first.c_str());
-        to_binary(builder, entry.second.get());
+        to_binary(builder, entry.second);
    }
    // terminating byte
    builder.put(BJSON_END);
@ -80,79 +83,56 @@ std::vector<ubyte> json::to_binary(const Map* obj, bool compress) {
    return builder.build();
 }

-static Value* value_from_binary(ByteReader& reader) {
+static Value value_from_binary(ByteReader& reader) {
    ubyte typecode = reader.get();
-    valtype type;
-    valvalue val;
    switch (typecode) {
        case BJSON_TYPE_DOCUMENT:
-            type = valtype::map;
            reader.getInt32();
-            val.map = object_from_binary(reader);
-            break;
+            return Map_sptr(object_from_binary(reader).release());
        case BJSON_TYPE_LIST:
-            type = valtype::list;
-            val.list = array_from_binary(reader);
-            break;
+            return List_sptr(array_from_binary(reader).release());
        case BJSON_TYPE_BYTE:
-            type = valtype::integer;
-            val.integer = reader.get();
-            break;
+            return static_cast<integer_t>(reader.get());
        case BJSON_TYPE_INT16:
-            type = valtype::integer;
-            val.integer = reader.getInt16();
-            break;
+            return static_cast<integer_t>(reader.getInt16());
        case BJSON_TYPE_INT32:
-            type = valtype::integer;
-            val.integer = reader.getInt32();
-            break;
+            return static_cast<integer_t>(reader.getInt32());
        case BJSON_TYPE_INT64:
-            type = valtype::integer;
-            val.integer = reader.getInt64();
-            break;
+            return reader.getInt64();
        case BJSON_TYPE_NUMBER:
-            type = valtype::number;
-            val.decimal = reader.getFloat64();
-            break;
+            return reader.getFloat64();
        case BJSON_TYPE_FALSE:
        case BJSON_TYPE_TRUE:
-            type = valtype::boolean;
-            val.boolean = typecode - BJSON_TYPE_FALSE;
-            break;
+            return (typecode - BJSON_TYPE_FALSE) != 0;
        case BJSON_TYPE_STRING:
-            type = valtype::string;
-            val.str = new std::string(reader.getString());
-            break;
+            return reader.getString();
        default:
            throw std::runtime_error(
-                  "type "+std::to_string(typecode)+" is not supported");
+                "type "+std::to_string(typecode)+" is not supported"
+            );
    }
-    return new Value(type, val);
 }

-static List* array_from_binary(ByteReader& reader) {
+static std::unique_ptr<List> array_from_binary(ByteReader& reader) {
    auto array = std::make_unique<List>();
-    auto& items = array->values;
    while (reader.peek() != BJSON_END) {
-        items.push_back(std::unique_ptr<Value>(value_from_binary(reader)));
+        array->put(value_from_binary(reader));
    }
    reader.get();
-    return array.release();
+    return array;
 }

-static Map* object_from_binary(ByteReader& reader) {
+static std::unique_ptr<Map> object_from_binary(ByteReader& reader) {
    auto obj = std::make_unique<Map>();
-    auto& map = obj->values;
    while (reader.peek() != BJSON_END) {
        const char* key = reader.getCString();
-        Value* value = value_from_binary(reader);
-        map.insert(std::make_pair(key, value));
+        obj->put(key, value_from_binary(reader));
    }
    reader.get();
-    return obj.release();
+    return obj;
 }

-std::unique_ptr<Map> json::from_binary(const ubyte* src, size_t size) {
+std::shared_ptr<Map> json::from_binary(const ubyte* src, size_t size) {
    if (size < 2) {
        throw std::runtime_error("bytes length is less than 2");
    }
@ -162,12 +142,12 @@ std::unique_ptr<Map> json::from_binary(const ubyte* src, size_t size) {
        return from_binary(data.data(), data.size());
    } else {
        ByteReader reader(src, size);
-        std::unique_ptr<Value> value (value_from_binary(reader));
-        if (value->type != valtype::map) {
+        Value value = value_from_binary(reader);
+
+        if (auto map = std::get_if<Map_sptr>(&value)) {
+            return *map;
+        } else {
            throw std::runtime_error("root value is not an object");
        }
-        std::unique_ptr<Map> obj (value->value.map);
-        value->value.map = nullptr;
-        return obj;
    }
 }
--- a/src/coders/binary_json.hpp
+++ b/src/coders/binary_json.hpp
@ -1,9 +1,14 @@
-#ifndef CODERS_BINARY_JSON_H_
-#define CODERS_BINARY_JSON_H_
+#ifndef CODERS_BINARY_JSON_HPP_
+#define CODERS_BINARY_JSON_HPP_
+
+#include "../typedefs.hpp"

 #include <vector>
 #include <memory>
-#include "../data/dynamic.h"
+
+namespace dynamic {
+    class Map;
+}

 namespace json {
    const int BJSON_END = 0x0;
@ -22,7 +27,7 @@ namespace json {
    const int BJSON_TYPE_CDOCUMENT = 0x1F;

    extern std::vector<ubyte> to_binary(const dynamic::Map* obj, bool compress=false);
-    extern std::unique_ptr<dynamic::Map> from_binary(const ubyte* src, size_t size);
+    extern std::shared_ptr<dynamic::Map> from_binary(const ubyte* src, size_t size);
 }

-#endif // CODERS_BINARY_JSON_H_
+#endif // CODERS_BINARY_JSON_HPP_
--- a/src/coders/byte_utils.cpp
+++ b/src/coders/byte_utils.cpp
@ -1,4 +1,4 @@
-#include "byte_utils.h"
+#include "byte_utils.hpp"

 #include <cstring>
 #include <limits>
--- a/src/coders/byte_utils.hpp
+++ b/src/coders/byte_utils.hpp
@ -1,9 +1,10 @@
-#ifndef CODERS_BYTE_UTILS_H_
-#define CODERS_BYTE_UTILS_H_
+#ifndef CODERS_BYTE_UTILS_HPP_
+#define CODERS_BYTE_UTILS_HPP_
+
+#include "../typedefs.hpp"

 #include <string>
 #include <vector>
-#include "../typedefs.h"

 /* byteorder: little-endian */
 class ByteBuilder {
@ -44,7 +45,7 @@ public:
    std::vector<ubyte> build();
 };

-/* byteorder: little-endian */
+/// byteorder: little-endian
 class ByteReader {
    const ubyte* data;
    size_t size;
@ -54,26 +55,29 @@ public:
    ByteReader(const ubyte* data);

    void checkMagic(const char* data, size_t size);
-    /* Read one byte (unsigned 8 bit integer) */
+    /// @brief Read one byte (unsigned 8 bit integer)
    ubyte get();
-    /* Read one byte (unsigned 8 bit integer) without pointer move */
+    /// @brief Read one byte (unsigned 8 bit integer) without pointer move
    ubyte peek();
-    /* Read signed 16 bit integer */
+    /// @brief Read signed 16 bit integer
    int16_t getInt16();
-    /* Read signed 32 bit integer */
+    /// @brief Read signed 32 bit integer
    int32_t getInt32();
-    /* Read signed 64 bit integer */
+    /// @brief Read signed 64 bit integer
    int64_t getInt64();
-    /* Read 32 bit floating-point number */
+    /// @brief Read 32 bit floating-point number
    float getFloat32();
-    /* Read 64 bit floating-point number */
+    /// @brief Read 64 bit floating-point number
    double getFloat64();
+    /// @brief Read C-String
    const char* getCString();
+    /// @brief Read string with unsigned 32 bit number before (length)
    std::string getString();
+    /// @return true if there is at least one byte remains
    bool hasNext() const;

    const ubyte* pointer() const;
    void skip(size_t n);
 };

-#endif // CODERS_BYTE_UTILS_H_
+#endif // CODERS_BYTE_UTILS_HPP_
--- a/src/coders/commons.cpp
+++ b/src/coders/commons.cpp
@ -1,344 +1,337 @@
-#include "commons.h"
-
-#include <sstream>
-#include <stdexcept>
-#include <math.h>
-
-inline double power(double base, int64_t power) {
-    double result = 1.0;
-    for (int64_t i = 0; i < power; i++) {
-        result *= base;
-    }
-    return result;
-}
-
-parsing_error::parsing_error(
-    std::string message, 
-    std::string filename, 
-    std::string source, 
-    uint pos, 
-    uint line, 
-    uint linestart)
-    : std::runtime_error(message), filename(filename), source(source), 
-      pos(pos), line(line), linestart(linestart) {
-}
-
-std::string parsing_error::errorLog() const {
-    std::stringstream ss;
-    uint linepos = pos - linestart;
-    ss << "parsing error in file '" << filename;
-    ss << "' at " << (line+1) << ":" << linepos << ": " << this->what() << "\n";
-    size_t end = source.find("\n", linestart);
-    if (end == std::string::npos) {
-        end = source.length();
-    }
-    ss << source.substr(linestart, end-linestart) << "\n";
-    for (uint i = 0; i < linepos; i++) {
-        ss << " ";
-    }
-    ss << "^";
-    return ss.str();
-
-}
-
-std::string escape_string(std::string s) {
-    std::stringstream ss;
-    ss << '"';
-    for (char c : s) {
-        switch (c) {
-            case '\n': ss << "\\n"; break;
-            case '\r': ss << "\\r"; break;
-            case '\t': ss << "\\t"; break;
-            case '\f': ss << "\\f"; break;
-            case '\b': ss << "\\b"; break;
-            case '"': ss << "\\\""; break;
-            case '\\': ss << "\\\\"; break;
-            default:
-                if (c < ' ') {
-                    ss << "\\" << std::oct << uint(ubyte(c));
-                    break;
-                }
-                ss << c;
-                break;
-        }
-    }
-    ss << '"';
-    return ss.str();
-}
-
-BasicParser::BasicParser(std::string file, std::string source) : filename(file), source(source) {
-}
-
-void BasicParser::skipWhitespace() {
-    while (hasNext()) {
-        char next = source[pos];
-        if (next == '\n') {
-            line++;
-            linestart = ++pos;
-            continue;
-        }
-        if (is_whitespace(next)) {
-            pos++;
-        } else {
-            break;
-        }
-    }
-}
-
-void BasicParser::skip(size_t n) {
-    n = std::min(n, source.length()-pos);
-
-    for (size_t i = 0; i < n; i++) {
-        char next = source[pos++];
-        if (next == '\n') {
-            line++;
-            linestart = pos;
-        }
-    }
-}
-
-void BasicParser::skipLine() {
-    while (hasNext()) {
-        if (source[pos] == '\n') {
-            pos++;
-            linestart = pos;
-            line++;
-            break;
-        }
-        pos++;
-    }
-}
-
-bool BasicParser::skipTo(const std::string& substring) {
-    size_t idx = source.find(substring, pos);
-    if (idx == std::string::npos) {
-        skip(source.length()-pos);
-        return false;
-    } else {
-        skip(idx-pos);
-        return true;
-    }
-}
-
-bool BasicParser::hasNext() {
-    return pos < source.length();
-}
-
-bool BasicParser::isNext(const std::string& substring) {
-    if (source.length() - pos < substring.length()) {
-        return false;
-    }
-    return source.substr(pos, substring.length()) == substring;
-}
-
-char BasicParser::nextChar() {
-    if (!hasNext()) {
-        throw error("unexpected end");
-    }
-    return source[pos++];
-}
-
-void BasicParser::expect(char expected) {
-    char c = peek();
-    if (c != expected) {
-        throw error("'"+std::string({expected})+"' expected");
-    }
-    pos++;
-}
-
-void BasicParser::expect(const std::string& substring) {
-    if (substring.empty())
-        return;
-    for (uint i = 0; i < substring.length(); i++) {
-        if (source.length() <= pos + i || source[pos+i] != substring[i]) {
-            throw error(escape_string(substring)+" expected");
-        }
-    }
-    pos += substring.length();
-}
-
-void BasicParser::expectNewLine() {
-    while (hasNext()) {
-        char next = source[pos];
-        if (next == '\n') {
-            line++;
-            linestart = ++pos;
-            return;
-        }
-        if (is_whitespace(next)) {
-            pos++;
-        } else {
-            throw error("line separator expected");
-        }
-    }
-}
-
-void BasicParser::goBack() {
-    if (pos) pos--;
-}
-
-char BasicParser::peek() {
-    skipWhitespace();
-    if (pos >= source.length()) {
-        throw error("unexpected end");
-    }
-    return source[pos];
-}
-
-std::string BasicParser::parseName() {
-    char c = peek();
-    if (!is_identifier_start(c)) {
-        if (c == '"') {
-            pos++;
-            return parseString(c);
-        }
-        throw error("identifier expected");
-    }
-    int start = pos;
-    while (hasNext() && is_identifier_part(source[pos])) {
-        pos++;
-    }
-    return source.substr(start, pos-start);
-}
-
-int64_t BasicParser::parseSimpleInt(int base) {
-    char c = peek();
-    int index = hexchar2int(c);
-    if (index == -1 || index >= base) {
-        throw error("invalid number literal");
-    }
-    int64_t value = index;
-    pos++;
-    while (hasNext()) {
-        c = source[pos];
-        while (c == '_') {
-            c = source[++pos];
-        }
-        index = hexchar2int(c);
-        if (index == -1 || index >= base) {
-            return value;
-        }
-        value *= base;
-        value += index;
-        pos++;
-    }
-    return value;
-}
-
-bool BasicParser::parseNumber(int sign, number_u& out) {
-    char c = peek();
-    int base = 10;
-    if (c == '0' && pos + 1 < source.length() && 
-          (base = is_box(source[pos+1])) != 10) {
-        pos += 2;
-        out.ival = parseSimpleInt(base);
-        return true;
-    } else if (c == 'i' && pos + 2 < source.length() && source[pos+1] == 'n' && source[pos+2] == 'f') {
-        pos += 3;
-        out.fval = INFINITY * sign;
-        return false;
-    } else if (c == 'n' && pos + 2 < source.length() && source[pos+1] == 'a' && source[pos+2] == 'n') {
-        pos += 3;
-        out.fval = NAN * sign;
-        return false;
-    }
-    int64_t value = parseSimpleInt(base);
-    if (!hasNext()) {
-        out.ival = value * sign;
-        return true;
-    }
-    c = source[pos];
-    if (c == 'e' || c == 'E') {
-        pos++;
-        int s = 1;
-        if (peek() == '-') {
-            s = -1;
-            pos++;
-        } else if (peek() == '+'){
-            pos++;
-        }
-        out.fval = sign * value * power(10.0, s * parseSimpleInt(10));
-        return false;
-    }
-    if (c == '.') {
-        pos++;
-        int64_t expo = 1;
-        while (hasNext() && source[pos] == '0') {
-            expo *= 10;
-            pos++;
-        }
-        int64_t afterdot = 0;
-        if (hasNext() && is_digit(source[pos])) {
-            afterdot = parseSimpleInt(10);
-        }
-        expo *= power(10, fmax(0, log10(afterdot) + 1));
-        c = source[pos];
-
-        double dvalue = (value + (afterdot / (double)expo));
-        if (c == 'e' || c == 'E') {
-            pos++;
-            int s = 1;
-            if (peek() == '-') {
-                s = -1;
-                pos++;
-            } else if (peek() == '+'){
-                pos++;
-            }
-            out.fval = sign * dvalue * power(10.0, s * parseSimpleInt(10));
-            return false;
-        }
-        out.fval = sign * dvalue;
-        return false;
-    }
-    out.ival = sign * value;
-    return true;
-}
-
-std::string BasicParser::parseString(char quote, bool closeRequired) {
-    std::stringstream ss;
-    while (hasNext()) {
-        char c = source[pos];
-        if (c == quote) {
-            pos++;
-            return ss.str();
-        }
-        if (c == '\\') {
-            pos++;
-            c = nextChar();
-            if (c >= '0' && c <= '7') {
-                pos--;
-                ss << (char)parseSimpleInt(8);
-                continue;
-            }
-            switch (c) {
-                case 'n': ss << '\n'; break;
-                case 'r': ss << '\r'; break;
-                case 'b': ss << '\b'; break;
-                case 't': ss << '\t'; break;
-                case 'f': ss << '\f'; break;
-                case '\'': ss << '\\'; break;
-                case '"': ss << '"'; break;
-                case '\\': ss << '\\'; break;
-                case '/': ss << '/'; break;
-                case '\n': pos++; continue;
-                default:
-                    throw error("'\\" + std::string({c}) + 
-                                "' is an illegal escape");
-            }
-            continue;
-        }
-        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);
-}
+#include "commons.hpp"
+
+#include "../util/stringutil.hpp"
+
+#include <sstream>
+#include <stdexcept>
+#include <math.h>
+
+inline double power(double base, int64_t power) {
+    double result = 1.0;
+    for (int64_t i = 0; i < power; i++) {
+        result *= base;
+    }
+    return result;
+}
+
+parsing_error::parsing_error(
+    std::string message,
+    std::string_view filename,
+    std::string_view source,
+    uint pos,
+    uint line,
+    uint linestart
+) : std::runtime_error(message), filename(filename), 
+    pos(pos), line(line), linestart(linestart)
+{
+    size_t end = source.find("\n", linestart);
+    if (end == std::string::npos) {
+        end = source.length();
+    }
+    this->source = source.substr(linestart, end-linestart);
+}
+
+std::string parsing_error::errorLog() const {
+    std::stringstream ss;
+    uint linepos = pos - linestart;
+    ss << "parsing error in file '" << filename;
+    ss << "' at " << (line+1) << ":" << linepos << ": " << this->what() << "\n";
+    ss << source << "\n";
+    for (uint i = 0; i < linepos; i++) {
+        ss << " ";
+    }
+    ss << "^";
+    return ss.str();
+}
+
+BasicParser::BasicParser(
+    std::string_view file,
+    std::string_view source
+) : filename(file), source(source) {
+}
+
+void BasicParser::skipWhitespace() {
+    while (hasNext()) {
+        char next = source[pos];
+        if (next == '\n') {
+            line++;
+            linestart = ++pos;
+            continue;
+        }
+        if (is_whitespace(next)) {
+            pos++;
+        } else {
+            break;
+        }
+    }
+}
+
+void BasicParser::skip(size_t n) {
+    n = std::min(n, source.length()-pos);
+
+    for (size_t i = 0; i < n; i++) {
+        char next = source[pos++];
+        if (next == '\n') {
+            line++;
+            linestart = pos;
+        }
+    }
+}
+
+void BasicParser::skipLine() {
+    while (hasNext()) {
+        if (source[pos] == '\n') {
+            pos++;
+            linestart = pos;
+            line++;
+            break;
+        }
+        pos++;
+    }
+}
+
+bool BasicParser::skipTo(const std::string& substring) {
+    size_t idx = source.find(substring, pos);
+    if (idx == std::string::npos) {
+        skip(source.length()-pos);
+        return false;
+    } else {
+        skip(idx-pos);
+        return true;
+    }
+}
+
+bool BasicParser::hasNext() {
+    return pos < source.length();
+}
+
+bool BasicParser::isNext(const std::string& substring) {
+    if (source.length() - pos < substring.length()) {
+        return false;
+    }
+    return source.substr(pos, substring.length()) == substring;
+}
+
+char BasicParser::nextChar() {
+    if (!hasNext()) {
+        throw error("unexpected end");
+    }
+    return source[pos++];
+}
+
+void BasicParser::expect(char expected) {
+    char c = peek();
+    if (c != expected) {
+        throw error("'"+std::string({expected})+"' expected");
+    }
+    pos++;
+}
+
+void BasicParser::expect(const std::string& substring) {
+    if (substring.empty())
+        return;
+    for (uint i = 0; i < substring.length(); i++) {
+        if (source.length() <= pos + i || source[pos+i] != substring[i]) {
+            throw error(util::quote(substring)+" expected");
+        }
+    }
+    pos += substring.length();
+}
+
+void BasicParser::expectNewLine() {
+    while (hasNext()) {
+        char next = source[pos];
+        if (next == '\n') {
+            line++;
+            linestart = ++pos;
+            return;
+        }
+        if (is_whitespace(next)) {
+            pos++;
+        } else {
+            throw error("line separator expected");
+        }
+    }
+}
+
+void BasicParser::goBack(size_t count) {
+    if (pos < count) {
+        throw std::runtime_error("pos < jump");
+    }
+    if (pos) { 
+        pos -= count;
+    }
+}
+
+char BasicParser::peek() {
+    skipWhitespace();
+    if (pos >= source.length()) {
+        throw error("unexpected end");
+    }
+    return source[pos];
+}
+
+char BasicParser::peekNoJump() {
+    if (pos >= source.length()) {
+        throw error("unexpected end");
+    }
+    return source[pos];
+}
+
+std::string_view BasicParser::readUntil(char c) {
+    int start = pos;
+    while (hasNext() && source[pos] != c) {
+        pos++;
+    }
+    return source.substr(start, pos-start);
+}
+
+std::string BasicParser::parseName() {
+    char c = peek();
+    if (!is_identifier_start(c)) {
+        if (c == '"') {
+            pos++;
+            return parseString(c);
+        }
+        throw error("identifier expected");
+    }
+    int start = pos;
+    while (hasNext() && is_identifier_part(source[pos])) {
+        pos++;
+    }
+    return std::string(source.substr(start, pos-start));
+}
+
+int64_t BasicParser::parseSimpleInt(int base) {
+    char c = peek();
+    int index = hexchar2int(c);
+    if (index == -1 || index >= base) {
+        throw error("invalid number literal");
+    }
+    int64_t value = index;
+    pos++;
+    while (hasNext()) {
+        c = source[pos];
+        while (c == '_') {
+            c = source[++pos];
+        }
+        index = hexchar2int(c);
+        if (index == -1 || index >= base) {
+            return value;
+        }
+        value *= base;
+        value += index;
+        pos++;
+    }
+    return value;
+}
+
+dynamic::Value BasicParser::parseNumber(int sign) {
+    char c = peek();
+    int base = 10;
+    if (c == '0' && pos + 1 < source.length() && 
+          (base = is_box(source[pos+1])) != 10) {
+        pos += 2;
+        return parseSimpleInt(base);
+    } else if (c == 'i' && pos + 2 < source.length() && source[pos+1] == 'n' && source[pos+2] == 'f') {
+        pos += 3;
+        return INFINITY * sign;
+    } else if (c == 'n' && pos + 2 < source.length() && source[pos+1] == 'a' && source[pos+2] == 'n') {
+        pos += 3;
+        return NAN * sign;
+    }
+    int64_t value = parseSimpleInt(base);
+    if (!hasNext()) {
+        return value * sign;
+    }
+    c = source[pos];
+    if (c == 'e' || c == 'E') {
+        pos++;
+        int s = 1;
+        if (peek() == '-') {
+            s = -1;
+            pos++;
+        } else if (peek() == '+'){
+            pos++;
+        }
+        return sign * value * power(10.0, s * parseSimpleInt(10));
+    }
+    if (c == '.') {
+        pos++;
+        int64_t expo = 1;
+        while (hasNext() && source[pos] == '0') {
+            expo *= 10;
+            pos++;
+        }
+        int64_t afterdot = 0;
+        if (hasNext() && is_digit(source[pos])) {
+            afterdot = parseSimpleInt(10);
+        }
+        expo *= power(10, fmax(0, log10(afterdot) + 1));
+        c = source[pos];
+
+        double dvalue = (value + (afterdot / (double)expo));
+        if (c == 'e' || c == 'E') {
+            pos++;
+            int s = 1;
+            if (peek() == '-') {
+                s = -1;
+                pos++;
+            } else if (peek() == '+'){
+                pos++;
+            }
+            return sign * dvalue * power(10.0, s * parseSimpleInt(10));
+        }
+        return sign * dvalue;
+    }
+    return sign * value;
+}
+
+std::string BasicParser::parseString(char quote, bool closeRequired) {
+    std::stringstream ss;
+    while (hasNext()) {
+        char c = source[pos];
+        if (c == quote) {
+            pos++;
+            return ss.str();
+        }
+        if (c == '\\') {
+            pos++;
+            c = nextChar();
+            if (c >= '0' && c <= '7') {
+                pos--;
+                ss << (char)parseSimpleInt(8);
+                continue;
+            }
+            switch (c) {
+                case 'n': ss << '\n'; break;
+                case 'r': ss << '\r'; break;
+                case 'b': ss << '\b'; break;
+                case 't': ss << '\t'; break;
+                case 'f': ss << '\f'; break;
+                case '\'': ss << '\\'; break;
+                case '"': ss << '"'; break;
+                case '\\': ss << '\\'; break;
+                case '/': ss << '/'; break;
+                case '\n': pos++; continue;
+                default:
+                    throw error("'\\" + std::string({c}) + 
+                                "' is an illegal escape");
+            }
+            continue;
+        }
+        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);
+}
--- a/src/coders/commons.hpp
+++ b/src/coders/commons.hpp
@ -1,14 +1,11 @@
-#ifndef CODERS_COMMONS_H_
-#define CODERS_COMMONS_H_
+#ifndef CODERS_COMMONS_HPP_
+#define CODERS_COMMONS_HPP_
+
+#include "../data/dynamic.hpp"
+#include "../typedefs.hpp"

 #include <string>
 #include <stdexcept>
-#include "../typedefs.h"
-
-union number_u {
-    double fval;
-    int64_t ival;
-};

 inline int is_box(int c) {
    switch (c) {
@ -34,11 +31,11 @@ inline bool is_whitespace(int c) {
 }

 inline bool is_identifier_start(int c) {
-    return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_' || c == '-' || c == '.';
+    return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_' || c == '.';
 }

 inline bool is_identifier_part(int c) {
-    return is_identifier_start(c) || is_digit(c);
+    return is_identifier_start(c) || is_digit(c) || c == '-';
 }

 inline int hexchar2int(int c) {
@ -54,8 +51,6 @@ inline int hexchar2int(int c) {
    return -1;
 }

-extern std::string escape_string(std::string s);
-
 class parsing_error : public std::runtime_error {
 public:
    std::string filename;
@ -64,20 +59,21 @@ public:
    uint line;
    uint linestart;

-    parsing_error(std::string message, 
-                    std::string filename, 
-                    std::string source, 
-                    uint pos, 
-                    uint line, 
-                    uint linestart);
-
+    parsing_error(
+        std::string message, 
+        std::string_view filename, 
+        std::string_view source, 
+        uint pos, 
+        uint line, 
+        uint linestart
+    );
    std::string errorLog() const;
 };

 class BasicParser {
 protected:
-    std::string filename;
-    std::string source;
+    std::string_view filename;
+    std::string_view source;
    uint pos = 0;
    uint line = 1;
    uint linestart = 0;
@ -88,21 +84,25 @@ protected:
    bool skipTo(const std::string& substring);
    void expect(char expected);
    void expect(const std::string& substring);
-    char peek();
-    char nextChar();
-    bool hasNext();
    bool isNext(const std::string& substring);
    void expectNewLine();
-    void goBack();
+    void goBack(size_t count=1);

-    std::string parseName();
    int64_t parseSimpleInt(int base);
-    bool parseNumber(int sign, number_u& out);
+    dynamic::Value parseNumber(int sign);
    std::string parseString(char chr, bool closeRequired=true);

    parsing_error error(std::string message);

-    BasicParser(std::string filename, std::string source);
+public:
+    std::string_view readUntil(char c);
+    std::string parseName();
+    bool hasNext();
+    char peek();
+    char peekNoJump();
+    char nextChar();
+
+    BasicParser(std::string_view file, std::string_view source);
 };

-#endif // CODERS_COMMONS_H_
+#endif // CODERS_COMMONS_HPP_
--- a/src/coders/gzip.cpp
+++ b/src/coders/gzip.cpp
@ -1,10 +1,11 @@
-#include "gzip.h"
+#include "gzip.hpp"
+
+#include "byte_utils.hpp"

 #define ZLIB_CONST
 #include <zlib.h>
 #include <math.h>
 #include <memory>
-#include "byte_utils.h"

 std::vector<ubyte> gzip::compress(const ubyte* src, size_t size) {
    size_t buffer_size = 23+size*1.01;
--- a/src/coders/gzip.hpp
+++ b/src/coders/gzip.hpp
@ -1,8 +1,8 @@
-#ifndef CODERS_GZIP_H_
-#define CODERS_GZIP_H_
+#ifndef CODERS_GZIP_HPP_
+#define CODERS_GZIP_HPP_

+#include "../typedefs.hpp"
 #include <vector>
-#include "../typedefs.h"

 namespace gzip {
    const unsigned char MAGIC[] = "\x1F\x8B";
@ -18,4 +18,4 @@ namespace gzip {
    std::vector<ubyte> decompress(const ubyte* src, size_t size);
 }

-#endif // CODERS_GZIP_H_
+#endif // CODERS_GZIP_HPP_
--- a/src/coders/imageio.cpp
+++ b/src/coders/imageio.cpp
@ -0,0 +1,49 @@
+#include "imageio.hpp"
+
+#include "png.hpp"
+#include "../graphics/core/ImageData.hpp"
+
+#include <filesystem>
+#include <functional>
+#include <unordered_map>
+
+namespace fs = std::filesystem;
+
+using image_reader = std::function<std::unique_ptr<ImageData>(const std::string&)>;
+using image_writer = std::function<void(const std::string&, const ImageData*)>;
+
+static std::unordered_map<std::string, image_reader> readers {
+    {".png", png::load_image},
+};
+
+static std::unordered_map<std::string, image_writer> writers {
+    {".png", png::write_image},
+};
+
+bool imageio::is_read_supported(const std::string& extension) {
+    return readers.find(extension) != readers.end();
+}
+
+bool imageio::is_write_supported(const std::string& extension) {
+    return writers.find(extension) != writers.end();
+}
+
+inline std::string extensionOf(const std::string& filename) {
+    return fs::u8path(filename).extension().u8string();
+}
+
+std::unique_ptr<ImageData> imageio::read(const std::string& filename) {
+    auto found = readers.find(extensionOf(filename));
+    if (found == readers.end()) {
+        throw std::runtime_error("file format is not supported (read): "+filename);
+    }
+    return std::unique_ptr<ImageData>(found->second(filename));
+}
+
+void imageio::write(const std::string& filename, const ImageData* image) {
+    auto found = writers.find(extensionOf(filename));
+    if (found == writers.end()) {
+        throw std::runtime_error("file format is not supported (write): "+filename);
+    }
+    return found->second(filename, image);
+}
--- a/src/coders/imageio.hpp
+++ b/src/coders/imageio.hpp
@ -0,0 +1,19 @@
+#ifndef CODERS_IMAGEIO_HPP_
+#define CODERS_IMAGEIO_HPP_
+
+#include <string>
+#include <memory>
+
+class ImageData;
+
+namespace imageio {
+    inline const std::string PNG = ".png";
+
+    bool is_read_supported(const std::string& extension);
+    bool is_write_supported(const std::string& extension);
+
+    std::unique_ptr<ImageData> read(const std::string& filename);
+    void write(const std::string& filename, const ImageData* image);
+}
+
+#endif // CODERS_IMAGEIO_HPP_
--- a/src/coders/json.cpp
+++ b/src/coders/json.cpp
@ -1,19 +1,31 @@
-#include "json.h"
+#include "json.hpp"
+
+#include "../data/dynamic.hpp"
+#include "../util/stringutil.hpp"

 #include <math.h>
 #include <sstream>
 #include <iomanip>
 #include <memory>

-#include "commons.h"
-#include "../data/dynamic.h"
-
 using namespace json;
 using namespace dynamic;

-inline void newline(std::stringstream& ss, 
-                    bool nice, uint indent, 
-                    const std::string& indentstr) {
+class Parser : BasicParser {
+    std::unique_ptr<dynamic::List> parseList();
+    std::unique_ptr<dynamic::Map> parseObject();
+    dynamic::Value parseValue();
+public:
+    Parser(std::string_view filename, std::string_view source);
+    
+    std::unique_ptr<dynamic::Map> parse();
+};
+
+inline void newline(
+    std::stringstream& ss, 
+    bool nice, uint indent, 
+    const std::string& indentstr
+) {
    if (nice) {
        ss << "\n";
        for (uint i = 0; i < indent; i++) {
@ -24,39 +36,37 @@ inline void newline(std::stringstream& ss,
    }
 }

-void stringify(const Value* value, 
-               std::stringstream& ss, 
-               int indent, 
-               const std::string& indentstr, 
-               bool nice);
+void stringifyObj(
+    const Map* obj, 
+    std::stringstream& ss, 
+    int indent, 
+    const std::string& indentstr, 
+    bool nice
+);

-void stringifyObj(const Map* obj, 
-               std::stringstream& ss, 
-               int indent, 
-               const std::string& indentstr, 
-               bool nice);
-
-void stringify(const Value* value, 
-               std::stringstream& ss, 
-               int indent, 
-               const std::string& indentstr, 
-               bool nice) {
-    if (value->type == valtype::map) {
-        stringifyObj(value->value.map, ss, indent, indentstr, nice);
+void stringifyValue(
+    const Value& value, 
+    std::stringstream& ss, 
+    int indent, 
+    const std::string& indentstr, 
+    bool nice
+) {
+    if (auto map = std::get_if<Map_sptr>(&value)) {
+        stringifyObj(map->get(), ss, indent, indentstr, nice);
    }
-    else if (value->type == valtype::list) {
-        auto list = value->value.list;
+    else if (auto listptr = std::get_if<List_sptr>(&value)) {
+        auto list = *listptr;
        if (list->size() == 0) {
            ss << "[]";
            return;
        }
        ss << '[';
        for (uint i = 0; i < list->size(); i++) {
-            Value* value = list->get(i);
+            Value& value = list->get(i);
            if (i > 0 || nice) {
                newline(ss, nice, indent, indentstr);
            }
-            stringify(value, ss, indent+1, indentstr, nice);
+            stringifyValue(value, ss, indent+1, indentstr, nice);
            if (i + 1 < list->size()) {
                ss << ',';
            }
@ -65,23 +75,26 @@ void stringify(const Value* value,
            newline(ss, true, indent - 1, indentstr);
        }
        ss << ']';
-    } else if (value->type == valtype::boolean) {
-        ss << (value->value.boolean ? "true" : "false");
-    } else if (value->type == valtype::number) {
-        ss << std::setprecision(15);
-        ss << value->value.decimal;
-    } else if (value->type == valtype::integer) {
-        ss << value->value.integer;
-    } else if (value->type == valtype::string) {
-        ss << escape_string(*value->value.str);
+    } else if (auto flag = std::get_if<bool>(&value)) {
+        ss << (*flag ? "true" : "false");
+    } else if (auto num = std::get_if<number_t>(&value)) {
+        ss << std::setprecision(15) << *num;
+    } else if (auto num = std::get_if<integer_t>(&value)) {
+        ss << *num;
+    } else if (auto str = std::get_if<std::string>(&value)) {
+        ss << util::escape(*str);
+    } else {
+        ss << "null";
    }
 }

-void stringifyObj(const Map* obj, 
-                  std::stringstream& ss, 
-                  int indent, 
-                  const std::string& indentstr, 
-                  bool nice) {
+void stringifyObj(
+    const Map* obj, 
+    std::stringstream& ss, 
+    int indent, 
+    const std::string& indentstr, 
+    bool nice
+) {
    if (obj->values.empty()) {
        ss << "{}";
        return;
@ -93,9 +106,9 @@ void stringifyObj(const Map* obj,
        if (index > 0 || nice) {
            newline(ss, nice, indent, indentstr);
        }
-        Value* value = entry.second.get();
-        ss << escape_string(key) << ": ";
-        stringify(value, ss, indent+1, indentstr, nice);
+        const Value& value = entry.second;
+        ss << util::escape(key) << ": ";
+        stringifyValue(value, ss, indent+1, indentstr, nice);
        index++;
        if (index < obj->values.size()) {
            ss << ',';
@ -108,19 +121,30 @@ void stringifyObj(const Map* obj,
 }

 std::string json::stringify(
-        const Map* obj, 
-        bool nice, 
-        const std::string& indent) {
+    const Map* obj, 
+    bool nice, 
+    const std::string& indent
+) {
    std::stringstream ss;
    stringifyObj(obj, ss, 1, indent, nice);
    return ss.str();
 }

-Parser::Parser(std::string filename, std::string source) 
-      : BasicParser(filename, source) {    
+std::string json::stringify(
+    const dynamic::Value& value, 
+    bool nice, 
+    const std::string& indent
+) {
+    std::stringstream ss;
+    stringifyValue(value, ss, 1, indent, nice);
+    return ss.str();
 }

-Map* Parser::parse() {
+Parser::Parser(std::string_view filename, std::string_view source) 
+    : BasicParser(filename, source) {    
+}
+
+std::unique_ptr<Map> Parser::parse() {
    char next = peek();
    if (next != '{') {
        throw error("'{' expected");
@ -128,7 +152,7 @@ Map* Parser::parse() {
    return parseObject();
 }

-Map* Parser::parseObject() {
+std::unique_ptr<Map> Parser::parseObject() {
    expect('{');
    auto obj = std::make_unique<Map>();
    auto& map = obj->values;
@ -154,10 +178,10 @@ Map* Parser::parseObject() {
        }
    }
    pos++;
-    return obj.release();
+    return obj;
 }

-List* Parser::parseList() {
+std::unique_ptr<List> Parser::parseList() {
    expect('[');
    auto arr = std::make_unique<List>();
    auto& values = arr->values;
@ -166,7 +190,7 @@ List* Parser::parseList() {
            skipLine();
            continue;
        }
-        values.push_back(std::unique_ptr<Value>(parseValue()));
+        values.push_back(parseValue());

        char next = peek();
        if (next == ',') {
@ -178,75 +202,49 @@ List* Parser::parseList() {
        }
    }
    pos++;
-    return arr.release();
+    return arr;
 }

-Value* Parser::parseValue() {
+Value Parser::parseValue() {
    char next = peek();
-    dynamic::valvalue val;
    if (next == '-' || next == '+') {
        pos++;
-        number_u num;
-        valtype type;
-        if (parseNumber(next == '-' ? -1 : 1, num)) {
-            val.integer = num.ival;
-            type = valtype::integer;
-        } else {
-            val.decimal = num.fval;
-            type = valtype::number;
-        }
-        return new Value(type, val);
+        return parseNumber(next == '-' ? -1 : 1);
    }
    if (is_identifier_start(next)) {
        std::string literal = parseName();
        if (literal == "true") {
-            val.boolean = true;
-            return new Value(valtype::boolean, val);
+            return true;
        } else if (literal == "false") {
-            val.boolean = false;
-            return new Value(valtype::boolean, val);
+            return false;
        } else if (literal == "inf") {
-            val.decimal = INFINITY;
-            return new Value(valtype::number, val);
+            return INFINITY;
        } else if (literal == "nan") {
-            val.decimal = NAN;
-            return new Value(valtype::number, val);
+            return NAN;
        }
        throw error("invalid literal ");
    }
    if (next == '{') {
-        val.map = parseObject();
-        return new Value(valtype::map, val);
+        return Map_sptr(parseObject().release());
    }
    if (next == '[') {
-        val.list = parseList();
-        return new Value(valtype::list, val);
+        return List_sptr(parseList().release());
    }
    if (is_digit(next)) {
-        number_u num;
-        valtype type;
-        if (parseNumber(1, num)) {
-            val.integer = num.ival;
-            type = valtype::integer;
-        } else {
-            val.decimal = num.fval;
-            type = valtype::number;
-        }
-        return new Value(type, val);  
+        return parseNumber(1);
    }
    if (next == '"' || next == '\'') {
        pos++;
-        val.str = new std::string(parseString(next));
-        return new Value(valtype::string, val);
+        return parseString(next);
    }
    throw error("unexpected character '"+std::string({next})+"'");
 }

-std::unique_ptr<Map> json::parse(std::string filename, std::string source) {
+std::unique_ptr<Map> json::parse(const std::string& filename, const std::string& source) {
    Parser parser(filename, source);
-    return std::unique_ptr<Map>(parser.parse());
+    return parser.parse();
 }

-std::unique_ptr<Map> json::parse(std::string source) {
+std::unique_ptr<Map> json::parse(const std::string& source) {
    return parse("<string>", source);
 }
--- a/src/coders/json.h
+++ b/src/coders/json.h
@ -1,41 +0,0 @@
-#ifndef CODERS_JSON_H_
-#define CODERS_JSON_H_
-
-#include <vector>
-#include <string>
-#include <stdint.h>
-#include <stdexcept>
-#include <unordered_map>
-
-#include "commons.h"
-#include "../typedefs.h"
-
-#include "binary_json.h"
-
-namespace dynamic {
-    class Map;
-    class List;
-    class Value;
-}
-
-namespace json {
-    class Parser : public BasicParser {
-        dynamic::List* parseList();
-        dynamic::Map* parseObject();
-        dynamic::Value* parseValue();
-    public:
-        Parser(std::string filename, std::string source);
-        
-        dynamic::Map* parse();
-    };
-
-    extern std::unique_ptr<dynamic::Map> parse(std::string filename, std::string source);
-    extern std::unique_ptr<dynamic::Map> parse(std::string source);
-
-    extern std::string stringify(
-        const dynamic::Map* obj, 
-        bool nice, 
-        const std::string& indent);
-}
-
-#endif // CODERS_JSON_H_
--- a/src/coders/json.hpp
+++ b/src/coders/json.hpp
@ -0,0 +1,33 @@
+#ifndef CODERS_JSON_HPP_
+#define CODERS_JSON_HPP_
+
+#include "commons.hpp"
+#include "binary_json.hpp"
+
+#include "../data/dynamic.hpp"
+#include "../typedefs.hpp"
+
+#include <vector>
+#include <string>
+#include <stdint.h>
+#include <stdexcept>
+#include <unordered_map>
+
+namespace json {
+    std::unique_ptr<dynamic::Map> parse(const std::string& filename, const std::string& source);
+    std::unique_ptr<dynamic::Map> parse(const std::string& source);
+
+    std::string stringify(
+        const dynamic::Map* obj, 
+        bool nice, 
+        const std::string& indent
+    );
+
+    std::string stringify(
+        const dynamic::Value& value,
+        bool nice,
+        const std::string& indent
+    );
+}
+
+#endif // CODERS_JSON_HPP_
--- a/src/coders/ogg.cpp
+++ b/src/coders/ogg.cpp
@ -1,13 +1,16 @@
-#include "ogg.h"
+#include "ogg.hpp"
+
+#include "../debug/Logger.hpp"
+#include "../audio/audio.hpp"
+#include "../typedefs.hpp"

 #include <string>
-#include <iostream>
 #include <vorbis/codec.h>
 #include <vorbis/vorbisfile.h>

-#include "../audio/audio.h"
-#include "../typedefs.h"
+static debug::Logger logger("ogg");

+namespace fs = std::filesystem;
 using namespace audio;

 static inline std::string vorbis_error_message(int code) {
@ -31,7 +34,7 @@ static inline std::string vorbis_error_message(int code) {
    }
 }

-audio::PCM* ogg::load_pcm(const std::filesystem::path& file, bool headerOnly) {
+std::unique_ptr<audio::PCM> ogg::load_pcm(const fs::path& file, bool headerOnly) {
    OggVorbis_File vf;
    int code;
    if ((code = ov_fopen(file.u8string().c_str(), &vf))) {
@ -56,7 +59,7 @@ audio::PCM* ogg::load_pcm(const std::filesystem::path& file, bool headerOnly) {
            if (ret == 0) {
                eof = true;
            } else if (ret < 0) {
-                std::cerr << "ogg::load_pcm: " << vorbis_error_message(ret) << std::endl;
+                logger.error() << "ogg::load_pcm: " << vorbis_error_message(ret);
            } else {
                data.insert(data.end(), std::begin(buffer), std::begin(buffer)+ret);
            }
@ -64,7 +67,9 @@ audio::PCM* ogg::load_pcm(const std::filesystem::path& file, bool headerOnly) {
        totalSamples = data.size() / channels / 2;
    }
    ov_clear(&vf);
-    return new PCM(std::move(data), totalSamples, channels, 16, sampleRate, seekable);
+    return std::make_unique<PCM>(
+        std::move(data), totalSamples, channels, 16, sampleRate, seekable
+    );
 }

 class OggStream : public PCMStream {
@ -98,7 +103,7 @@ public:
        int bitstream = 0;
        long bytes = ov_read(&vf, buffer, bufferSize, 0, 2, true, &bitstream);
        if (bytes < 0) {
-            std::cerr << "ogg::load_pcm: " << vorbis_error_message(bytes) << " " << bytes << std::endl;
+            logger.error() << "ogg::load_pcm: " << vorbis_error_message(bytes) << " " << bytes;
            return PCMStream::ERROR;
        }
        return bytes;
@ -147,11 +152,11 @@ public:
    }
 };

-PCMStream* ogg::create_stream(const std::filesystem::path& file) {
+std::unique_ptr<PCMStream> ogg::create_stream(const fs::path& file) {
    OggVorbis_File vf;
    int code;
    if ((code = ov_fopen(file.u8string().c_str(), &vf))) {
        throw std::runtime_error("vorbis: "+vorbis_error_message(code));
    }
-    return new OggStream(std::move(vf));
+    return std::make_unique<OggStream>(std::move(vf));
 }
--- a/src/coders/ogg.h
+++ b/src/coders/ogg.h
@ -1,16 +0,0 @@
-#ifndef CODERS_OGG_H_
-#define CODERS_OGG_H_
-
-#include <filesystem>
-
-namespace audio {
-    struct PCM;
-    class PCMStream;
-}
-
-namespace ogg {
-    extern audio::PCM* load_pcm(const std::filesystem::path& file, bool headerOnly);
-    extern audio::PCMStream* create_stream(const std::filesystem::path& file);
-}
-
-#endif // CODERS_OGG_H_
--- a/src/coders/ogg.hpp
+++ b/src/coders/ogg.hpp
@ -0,0 +1,16 @@
+#ifndef CODERS_OGG_HPP_
+#define CODERS_OGG_HPP_
+
+#include <filesystem>
+
+namespace audio {
+    struct PCM;
+    class PCMStream;
+}
+
+namespace ogg {
+    std::unique_ptr<audio::PCM> load_pcm(const std::filesystem::path& file, bool headerOnly);
+    std::unique_ptr<audio::PCMStream> create_stream(const std::filesystem::path& file);
+}
+
+#endif // CODERS_OGG_HPP_
--- a/src/coders/png.cpp
+++ b/src/coders/png.cpp
@ -1,12 +1,14 @@
-#include "png.h"
+#include "png.hpp"
+
+#include "../graphics/core/ImageData.hpp"
+#include "../graphics/core/Texture.hpp"
+#include "../files/files.hpp"
+#include "../debug/Logger.hpp"

 #include <iostream>
-#include <memory>
 #include <GL/glew.h>

-#include "../graphics/ImageData.h"
-#include "../graphics/Texture.h"
-#include "../files/files.h"
+static debug::Logger logger("png-coder");

 #ifndef _WIN32
 #define LIBPNG
@ -19,78 +21,76 @@
 int _png_write(const char* filename, uint width, uint height, const ubyte* data, bool alpha) {
    uint pixsize = alpha ? 4 : 3;

-	// Open file for writing (binary mode)
-	FILE* fp = fopen(filename, "wb");
-	if (fp == nullptr) {
-		fprintf(stderr, "Could not open file %s for writing\n", filename);
-		fclose(fp);
-		return 1;
-	}
+    // Open file for writing (binary mode)
+    FILE* fp = fopen(filename, "wb");
+    if (fp == nullptr) {
+        logger.error() << "could not open file " << filename << " for writing";
+        fclose(fp);
+        return 1;
+    }

-	// Initialize write structure
-	png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
-	if (png_ptr == nullptr) {
-		fprintf(stderr, "Could not allocate write struct\n");
-		fclose(fp);
-		png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
-		return 1;
-	}
+    // Initialize write structure
+    png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
+    if (png_ptr == nullptr) {
+        logger.error() << "could not allocate write struct";
+        fclose(fp);
+        return 1;
+    }

-	// Initialize info structure
-	png_infop info_ptr = png_create_info_struct(png_ptr);
-	if (info_ptr == nullptr) {
-		fprintf(stderr, "Could not allocate info struct\n");
-		fclose(fp);
-		png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-		png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
-		return 1;
-		
-	}
+    // Initialize info structure
+    png_infop info_ptr = png_create_info_struct(png_ptr);
+    if (info_ptr == nullptr) {
+        logger.error() << "could not allocate info struct";
+        fclose(fp);
+        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+        png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
+        return 1;
+        
+    }

-	// Setup Exception handling
-	if (setjmp(png_jmpbuf(png_ptr))) {
-		fprintf(stderr, "Error during png creation\n");
-		fclose(fp);
-		png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-		png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
-		return 1;
-	}
+    // Setup Exception handling
+    if (setjmp(png_jmpbuf(png_ptr))) {
+        logger.error() << "error during png creation";
+        fclose(fp);
+        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        return 1;
+    }

-	png_init_io(png_ptr, fp);
+    png_init_io(png_ptr, fp);

-	// Write header (8 bit colour depth)
-	png_set_IHDR(png_ptr, info_ptr, width, height,
-			8, 
+    // Write header (8 bit colour depth)
+    png_set_IHDR(png_ptr, info_ptr, width, height,
+            8, 
            alpha ? PNG_COLOR_TYPE_RGBA : 
                       PNG_COLOR_TYPE_RGB, 
            PNG_INTERLACE_NONE,
-			PNG_COMPRESSION_TYPE_BASE, 
+            PNG_COMPRESSION_TYPE_BASE, 
            PNG_FILTER_TYPE_BASE);

-	png_write_info(png_ptr, info_ptr);
+    png_write_info(png_ptr, info_ptr);

-	std::unique_ptr<png_byte[]> row(new png_byte[pixsize * width]);
-
-	// Write image data
-	for (uint y = 0; y < height; y++) {
-		for (uint x = 0; x < width; x++) {
+    auto row = std::make_unique<png_byte[]>(pixsize * width);
+    // Write image data
+    for (uint y = 0; y < height; y++) {
+        for (uint x = 0; x < width; x++) {
            for (uint i = 0; i < pixsize; i++) {
                row[x * pixsize + i] = (png_byte)data[(y * width + x) * pixsize + i];
            }
-		}
-		png_write_row(png_ptr, row.get());
-	}
+        }
+        png_write_row(png_ptr, row.get());
+    }

-	// End write
-	png_write_end(png_ptr, nullptr);
+    // End write
+    png_write_end(png_ptr, nullptr);

-	fclose(fp);
-	png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-	png_destroy_write_struct(&png_ptr, (png_infopp)nullptr);
-	return 0;
+    fclose(fp);
+    png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+    png_destroy_write_struct(&png_ptr, &info_ptr);
+    return 0;
 }

-ImageData* _png_load(const char* file){
+std::unique_ptr<ImageData> _png_load(const char* file){
    FILE* fp = nullptr;
    if ((fp = fopen(file, "rb")) == nullptr) {
        return nullptr;
@ -175,12 +175,12 @@ ImageData* _png_load(const char* file){
            format = ImageFormat::rgb888;
            break;
        default:
-            printf("Color type %d not supported!\n", color_type);
+            logger.error() << "color type " << color_type << " is not supported!";
            png_destroy_read_struct(&png, &info, &end_info);
-			fclose(fp);
+            fclose(fp);
            return nullptr;
    }
-    ImageData* image = new ImageData(format, width, height, (void*)image_data.release());
+    auto image = std::make_unique<ImageData>(format, width, height, (void*)image_data.release());
    png_destroy_read_struct(&png, &info, &end_info);
    fclose(fp);
    return image;
@ -194,172 +194,159 @@ ImageData* _png_load(const char* file){
 static const int SPNG_SUCCESS = 0;
 //returns spng result code
 int _png_write(const char* filename, uint width, uint height, const ubyte* data, bool alpha) {
-	int fmt;
-	int ret = 0;
-	spng_ctx* ctx = nullptr;
-	spng_ihdr ihdr = { 0 };
-	uint pixsize = alpha ? 4 : 3;
+    int fmt;
+    int ret = 0;
+    spng_ctx* ctx = nullptr;
+    spng_ihdr ihdr = { 0 };
+    uint pixsize = alpha ? 4 : 3;

-	ctx = spng_ctx_new(SPNG_CTX_ENCODER);
-	spng_set_option(ctx, SPNG_ENCODE_TO_BUFFER, 1);
+    ctx = spng_ctx_new(SPNG_CTX_ENCODER);
+    spng_set_option(ctx, SPNG_ENCODE_TO_BUFFER, 1);

-	ihdr.width = width;
-	ihdr.height = height;
-	ihdr.color_type = alpha ? SPNG_COLOR_TYPE_TRUECOLOR_ALPHA : SPNG_COLOR_TYPE_TRUECOLOR;
-	ihdr.bit_depth = 8;
+    ihdr.width = width;
+    ihdr.height = height;
+    ihdr.color_type = alpha ? SPNG_COLOR_TYPE_TRUECOLOR_ALPHA : SPNG_COLOR_TYPE_TRUECOLOR;
+    ihdr.bit_depth = 8;

-	spng_set_ihdr(ctx, &ihdr);
-	fmt = SPNG_FMT_PNG;
-	ret = spng_encode_image(ctx, data, (size_t)width * (size_t)height * pixsize , fmt, SPNG_ENCODE_FINALIZE);
-	if (ret != SPNG_SUCCESS) {
-		printf("spng_encode_image() error: %s\n", spng_strerror(ret));
-		fflush(stdout);
-		spng_ctx_free(ctx);
-		return ret;
-	}
+    spng_set_ihdr(ctx, &ihdr);
+    fmt = SPNG_FMT_PNG;
+    ret = spng_encode_image(ctx, data, (size_t)width * (size_t)height * pixsize , fmt, SPNG_ENCODE_FINALIZE);
+    if (ret != SPNG_SUCCESS) {
+        logger.error() << "spng_encode_image() error: " << spng_strerror(ret);
+        spng_ctx_free(ctx);
+        return ret;
+    }

-	size_t png_size;
-	void* png_buf = spng_get_png_buffer(ctx, &png_size, &ret);
+    size_t png_size;
+    void* png_buf = spng_get_png_buffer(ctx, &png_size, &ret);

-	if (png_buf == nullptr) {
-		printf("spng_get_png_buffer() error: %s\n", spng_strerror(ret));
-	}
-	else {
-		files::write_bytes(filename, (const unsigned char*)png_buf, png_size);
-	}
-	fflush(stdout);
-	spng_ctx_free(ctx);
-	return ret;
+    if (png_buf == nullptr) {
+        logger.error() << "spng_get_png_buffer() error: " << spng_strerror(ret);
+    }
+    else {
+        files::write_bytes(filename, (const unsigned char*)png_buf, png_size);
+    }
+    spng_ctx_free(ctx);
+    return ret;
 }

-ImageData* _png_load(const char* file){
-	int r = 0;
-	FILE *png = nullptr;
-	char *pngbuf = nullptr;
-	spng_ctx *ctx = nullptr;
-	unsigned char *out = nullptr;
+std::unique_ptr<ImageData> _png_load(const char* file){
+    int r = 0;
+    FILE *png = nullptr;
+    char *pngbuf = nullptr;
+    spng_ctx *ctx = nullptr;
+    unsigned char *out = nullptr;

-	png = fopen(file, "rb");
-	if (png == nullptr){
-		std::cerr << "could not to open file " << file << std::endl;
-		return nullptr;
-	}
+    png = fopen(file, "rb");
+    if (png == nullptr){
+        logger.error() << "could not to open file " << file;
+        return nullptr;
+    }

-	fseek(png, 0, SEEK_END);
-	long siz_pngbuf = ftell(png);
-	rewind(png);
-	if(siz_pngbuf < 1) {
-		fclose(png);
-		std::cerr << "could not to read file " << file << std::endl;
-		return nullptr;
-	}
-	pngbuf = new char[siz_pngbuf];
-	if(fread(pngbuf, siz_pngbuf, 1, png) != 1){ //check of read elements count
-		fclose(png);
-		delete[] pngbuf;
-		std::cerr << "fread() failed" << std::endl;
-		return nullptr;
-	}
-	fclose(png); // <- finally closing file
-	ctx = spng_ctx_new(0);
-	if (ctx == nullptr){
-		delete[] pngbuf;
-		std::cerr << "spng_ctx_new() failed" << std::endl;
-		return nullptr;
-	}
-	r = spng_set_crc_action(ctx, SPNG_CRC_USE, SPNG_CRC_USE);
-	if (r != SPNG_SUCCESS){
-		delete[] pngbuf;
-		spng_ctx_free(ctx);
-		std::cerr << "spng_set_crc_action() error: " << spng_strerror(r) << std::endl;
-		return nullptr;
-	}
-	r = spng_set_png_buffer(ctx, pngbuf, siz_pngbuf);
-	if (r != SPNG_SUCCESS){
-		delete[] pngbuf;
-		spng_ctx_free(ctx);
-		std::cerr << "spng_set_png_buffer() error: " << spng_strerror(r) << std::endl;
-		return nullptr;
-	}
+    fseek(png, 0, SEEK_END);
+    long siz_pngbuf = ftell(png);
+    rewind(png);
+    if(siz_pngbuf < 1) {
+        fclose(png);
+        logger.error() << "could not to read file " << file;
+        return nullptr;
+    }
+    pngbuf = new char[siz_pngbuf];
+    if(fread(pngbuf, siz_pngbuf, 1, png) != 1){ //check of read elements count
+        fclose(png);
+        delete[] pngbuf;
+        logger.error() << "fread() failed: " << file;
+        return nullptr;
+    }
+    fclose(png); // <- finally closing file
+    ctx = spng_ctx_new(0);
+    if (ctx == nullptr){
+        delete[] pngbuf;
+        logger.error() << "spng_ctx_new() failed";
+        return nullptr;
+    }
+    r = spng_set_crc_action(ctx, SPNG_CRC_USE, SPNG_CRC_USE);
+    if (r != SPNG_SUCCESS){
+        delete[] pngbuf;
+        spng_ctx_free(ctx);
+        logger.error() << "spng_set_crc_action(): " << spng_strerror(r);
+        return nullptr;
+    }
+    r = spng_set_png_buffer(ctx, pngbuf, siz_pngbuf);
+    if (r != SPNG_SUCCESS){
+        delete[] pngbuf;
+        spng_ctx_free(ctx);
+        logger.error() << "spng_set_png_buffer(): " << spng_strerror(r);
+        return nullptr;
+    }

-	spng_ihdr ihdr;
-	r = spng_get_ihdr(ctx, &ihdr);
-	if (r != SPNG_SUCCESS){
-		delete[] pngbuf;
-		spng_ctx_free(ctx);
-		std::cerr << "spng_get_ihdr() error: " << spng_strerror(r) << std::endl;
-		return nullptr;
-	}
-	//// Unused "something"
-	//const char *clr_type_str;
-	//if(ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE)
-	//	clr_type_str = "grayscale";
-	//else if(ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR)
-	//	clr_type_str = "truecolor";
-	//else if(ihdr.color_type == SPNG_COLOR_TYPE_INDEXED)
-	//	clr_type_str = "indexed color";
-	//else if(ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA)
-	//	clr_type_str = "grayscale with alpha";
-	//else
-	//	clr_type_str = "truecolor with alpha";
+    spng_ihdr ihdr;
+    r = spng_get_ihdr(ctx, &ihdr);
+    if (r != SPNG_SUCCESS){
+        delete[] pngbuf;
+        spng_ctx_free(ctx);
+        logger.error() << "spng_get_ihdr(): " << spng_strerror(r);
+        return nullptr;
+    }

-	size_t out_size;
-	r = spng_decoded_image_size(ctx, SPNG_FMT_RGBA8, &out_size);
-	if (r != SPNG_SUCCESS){
-		delete[] pngbuf;
-		spng_ctx_free(ctx);
-		std::cerr << "spng_decoded_image_size() error: " << spng_strerror(r) << std::endl;
-		return nullptr;
-	}
-	out = new unsigned char[out_size];
-	r = spng_decode_image(ctx, out, out_size, SPNG_FMT_RGBA8, 0);
-	if (r != SPNG_SUCCESS){
-		delete[] out;
-		delete[] pngbuf;
-		spng_ctx_free(ctx);
-		std::cerr << "spng_decode_image() error: " << spng_strerror(r) << std::endl;
-		return nullptr;
-	}
+    size_t out_size;
+    r = spng_decoded_image_size(ctx, SPNG_FMT_RGBA8, &out_size);
+    if (r != SPNG_SUCCESS){
+        delete[] pngbuf;
+        spng_ctx_free(ctx);
+        logger.error() << "spng_decoded_image_size(): " << spng_strerror(r);
+        return nullptr;
+    }
+    out = new unsigned char[out_size];
+    r = spng_decode_image(ctx, out, out_size, SPNG_FMT_RGBA8, 0);
+    if (r != SPNG_SUCCESS){
+        delete[] out;
+        delete[] pngbuf;
+        spng_ctx_free(ctx);
+        logger.error() << "spng_decode_image(): " << spng_strerror(r);
+        return nullptr;
+    }

-	unsigned char* flipped = new unsigned char[out_size];
+    unsigned char* flipped = new unsigned char[out_size];

-	for (size_t i = 0; i < ihdr.height; i+=1){
-		size_t rowsize = ihdr.width*4;
-		for (size_t j = 0; j < rowsize; j++){
-			flipped[(ihdr.height-i-1)*rowsize+j] = out[i*rowsize+j];
-		}
-	}
-	delete[] out; // <- finally delete out // no, delete spng usage
+    for (size_t i = 0; i < ihdr.height; i+=1){
+        size_t rowsize = ihdr.width*4;
+        for (size_t j = 0; j < rowsize; j++){
+            flipped[(ihdr.height-i-1)*rowsize+j] = out[i*rowsize+j];
+        }
+    }
+    delete[] out; // <- finally delete out // no, delete spng usage

-    ImageData* image = new ImageData(ImageFormat::rgba8888, ihdr.width, ihdr.height, (void*)flipped);
+    auto image = std::make_unique<ImageData>(ImageFormat::rgba8888, ihdr.width, ihdr.height, (void*)flipped);

-	delete[] pngbuf;
-	spng_ctx_free(ctx);
+    delete[] pngbuf;
+    spng_ctx_free(ctx);

    return image;
 }
 #endif

-ImageData* png::load_image(std::string filename) {
-	ImageData* image (_png_load(filename.c_str()));
-	if (image == nullptr) {
-		std::cerr << "Could not load image " << filename << std::endl;
-		return nullptr;
-	}
+std::unique_ptr<ImageData> png::load_image(const std::string& filename) {
+    auto image = _png_load(filename.c_str());
+    if (image == nullptr) {
+        throw std::runtime_error("could not load image "+filename);
+    }
    return image;
 }

-Texture* png::load_texture(std::string filename) {
-	std::unique_ptr<ImageData> image (_png_load(filename.c_str()));
-	if (image == nullptr){
-		std::cerr << "Could not load texture " << filename << std::endl;
-		return nullptr;
-	}
-	auto texture = Texture::from(image.get());
+std::unique_ptr<Texture> png::load_texture(const std::string& filename) {
+    auto image = load_image(filename);
+    auto texture = Texture::from(image.get());
    texture->setNearestFilter();
    return texture;
 }

-void png::write_image(std::string filename, const ImageData* image) {
-    _png_write(filename.c_str(), image->getWidth(), image->getHeight(), (const ubyte*)image->getData(), image->getFormat() == ImageFormat::rgba8888);
-}
+void png::write_image(const std::string& filename, const ImageData* image) {
+    _png_write(
+        filename.c_str(), 
+        image->getWidth(), 
+        image->getHeight(), 
+        (const ubyte*)image->getData(), 
+        image->getFormat() == ImageFormat::rgba8888
+    );
+}
--- a/src/coders/png.h
+++ b/src/coders/png.h
@ -1,16 +0,0 @@
-#ifndef CODERS_PNG_H_
-#define CODERS_PNG_H_
-
-#include <string>
-#include "../typedefs.h"
-
-class Texture;
-class ImageData;
-
-namespace png {
-    extern ImageData* load_image(std::string filename);
-    extern void write_image(std::string filename, const ImageData* image);
-    extern Texture* load_texture(std::string filename);
-}
-
-#endif /* CODERS_PNG_H_ */
--- a/src/coders/png.hpp
+++ b/src/coders/png.hpp
@ -0,0 +1,16 @@
+#ifndef CODERS_PNG_HPP_
+#define CODERS_PNG_HPP_
+
+#include <memory>
+#include <string>
+
+class Texture;
+class ImageData;
+
+namespace png {
+    std::unique_ptr<ImageData> load_image(const std::string& filename);
+    void write_image(const std::string& filename, const ImageData* image);
+    std::unique_ptr<Texture> load_texture(const std::string& filename);
+}
+
+#endif // CODERS_PNG_HPP_
--- a/src/coders/rle.cpp
+++ b/src/coders/rle.cpp
@ -0,0 +1,90 @@
+#include "rle.hpp"
+
+size_t rle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
+    size_t offset = 0;
+    for (size_t i = 0; i < srclen;) {
+        ubyte len = src[i++];
+        ubyte c = src[i++];
+        for (size_t j = 0; j <= len; j++) {
+            dst[offset++] = c;
+        }
+    }
+    return offset;
+}
+
+size_t rle::encode(const ubyte* src, size_t srclen, ubyte* dst) {
+    if (srclen == 0) {
+        return 0;
+    }
+    size_t offset = 0;
+    ubyte counter = 0;
+    ubyte c = src[0];
+    for (size_t i = 1; i < srclen; i++) {
+        ubyte cnext = src[i];
+        if (cnext != c || counter == 255) {
+            dst[offset++] = counter;
+            dst[offset++] = c;
+            c = cnext;
+            counter = 0;
+        }
+        else {
+            counter++;
+        }
+    }
+    dst[offset++] = counter;
+    dst[offset++] = c;
+    return offset;
+}
+
+
+size_t extrle::decode(const ubyte* src, size_t srclen, ubyte* dst) {
+    size_t offset = 0;
+    for (size_t i = 0; i < srclen;) {
+        uint len = src[i++];
+        if (len & 0x80) {
+            len &= 0x7F;
+            len |= ((uint)src[i++]) << 7;
+        }
+        ubyte c = src[i++];
+        for (size_t j = 0; j <= len; j++) {
+            dst[offset++] = c;
+        }
+    }
+    return offset;
+}
+
+size_t extrle::encode(const ubyte* src, size_t srclen, ubyte* dst) {
+    if (srclen == 0) {
+        return 0;
+    }
+    size_t offset = 0;
+    uint counter = 0;
+    ubyte c = src[0];
+    for (size_t i = 1; i < srclen; i++) {
+        ubyte cnext = src[i];
+        if (cnext != c || counter == max_sequence) {
+            if (counter >= 0x80) {
+                dst[offset++] = 0x80 | (counter & 0x7F);
+                dst[offset++] = counter >> 7;
+            }
+            else {
+                dst[offset++] = counter;
+            }
+            dst[offset++] = c;
+            c = cnext;
+            counter = 0;
+        }
+        else {
+            counter++;
+        }
+    }
+    if (counter >= 0x80) {
+        dst[offset++] = 0x80 | (counter & 0x7F);
+        dst[offset++] = counter >> 7;
+    }
+    else {
+        dst[offset++] = counter;
+    }
+    dst[offset++] = c;
+    return offset;
+}
--- a/src/coders/rle.hpp
+++ b/src/coders/rle.hpp
@ -0,0 +1,17 @@
+#ifndef CODERS_RLE_HPP_
+#define CODERS_RLE_HPP_
+
+#include "../typedefs.hpp"
+
+namespace rle {
+    size_t encode(const ubyte* src, size_t length, ubyte* dst);
+    size_t decode(const ubyte* src, size_t length, ubyte* dst);
+}
+
+namespace extrle {
+    constexpr uint max_sequence = 0x7FFF;
+    size_t encode(const ubyte* src, size_t length, ubyte* dst);
+    size_t decode(const ubyte* src, size_t length, ubyte* dst);
+}
+
+#endif // CODERS_RLE_HPP_
--- a/src/coders/toml.cpp
+++ b/src/coders/toml.cpp
@ -1,249 +1,133 @@
-#include "toml.h"
-#include "commons.h"
-
-#include <math.h>
-#include <iostream>
-#include <iomanip>
-#include <sstream>
-#include <assert.h>
-
-using std::string;
-
-using namespace toml;
-
-Section::Section(string name) : name(name) {
-}
-
-void Section::add(std::string name, Field field) {
-    if (fields.find(name) != fields.end()) {
-        throw std::runtime_error("field duplication");
-    }
-    fields[name] = field;
-    keyOrder.push_back(name);
-}
-
-void Section::add(string name, bool* ptr) {
-    add(name, {fieldtype::ftbool, ptr});
-}
-
-void Section::add(string name, int* ptr) {
-    add(name, {fieldtype::ftint, ptr});
-}
-
-void Section::add(string name, uint* ptr) {
-    add(name, {fieldtype::ftuint, ptr});
-}
-
-void Section::add(string name, float* ptr) {
-    add(name, {fieldtype::ftfloat, ptr});
-}
-
-void Section::add(string name, string* ptr) {
-    add(name, {fieldtype::ftstring, ptr});
-}
-
-string Section::getName() const {
-    return name;
-}
-
-const Field* Section::field(std::string name) const {
-    auto found = fields.find(name);
-    if (found == fields.end()) {
-        return nullptr;
-    }
-    return &found->second;
-}
-
-const std::vector<std::string>& Section::keys() const {
-    return keyOrder;
-}
-
-Wrapper::~Wrapper() {
-    for (auto entry : sections) {
-        delete entry.second;
-    }
-}
-
-Section& Wrapper::add(std::string name) {
-    if (sections.find(name) != sections.end()) {
-        throw std::runtime_error("section duplication");
-    }
-    Section* section = new Section(name);
-    sections[name] = section;
-    keyOrder.push_back(name);
-    return *section;
-}
-
-Section* Wrapper::section(std::string name) {
-    auto found = sections.find(name);
-    if (found == sections.end()) {
-        return nullptr;
-    }
-    return found->second;
-}
-
-std::string Wrapper::write() const {
-    std::stringstream ss;
-    for (string key : keyOrder) {
-        const Section* section = sections.at(key);
-        ss << "[" << key << "]\n";
-        for (const string& key : section->keys()) {
-            ss << key << " = ";
-            const Field* field = section->field(key);
-            assert(field != nullptr);
-            switch (field->type) {
-                case fieldtype::ftbool:
-                    ss << (*((bool*)field->ptr) ? "true" : "false");
-                    break;
-                case fieldtype::ftint: ss << *((int*)field->ptr); break;
-                case fieldtype::ftuint: ss << *((uint*)field->ptr); break;
-                case fieldtype::ftfloat: ss << *((float*)field->ptr); break;
-                case fieldtype::ftstring: 
-                    ss << escape_string(*((const string*)field->ptr)); 
-                    break;
-            }
-            ss << "\n";
-        }
-        ss << "\n";
-    }
-    return ss.str();
-}
-
-Reader::Reader(Wrapper* wrapper, string file, string source) : BasicParser(file, source), wrapper(wrapper) {
-}
-
-void Reader::skipWhitespace() {
-    BasicParser::skipWhitespace();
-    if (hasNext() && source[pos] == '#') {
-        skipLine();
-        if (hasNext() && is_whitespace(peek())) {
-            skipWhitespace();
-        }
-    }
-}
-
-void Reader::read() {
-    skipWhitespace();
-    if (!hasNext()) {
-        return;
-    }
-    readSection(nullptr);
-}
-
-inline bool is_numeric_type(fieldtype type) {
-    return type == fieldtype::ftint || type == fieldtype::ftfloat;
-}
-
-void Section::set(string name, double value) {
-    const Field* field = this->field(name);
-    if (field == nullptr) {
-        std::cerr << "warning: unknown key '" << name << "'" << std::endl;
-    } else {
-        switch (field->type) {
-        case fieldtype::ftbool: *(bool*)(field->ptr) = fabs(value) > 0.0; break;
-        case fieldtype::ftint: *(int*)(field->ptr) = value; break;
-        case fieldtype::ftuint: *(uint*)(field->ptr) = value; break;
-        case fieldtype::ftfloat: *(float*)(field->ptr) = value; break;
-        case fieldtype::ftstring: *(string*)(field->ptr) = std::to_string(value); break;
-        default:
-            std::cerr << "error: type error for key '" << name << "'" << std::endl;
-        }
-    }
-}
-
-void Section::set(std::string name, bool value) {
-    const Field* field = this->field(name);
-    if (field == nullptr) {
-        std::cerr << "warning: unknown key '" << name << "'" << std::endl;
-    } else {
-        switch (field->type) {
-        case fieldtype::ftbool: *(bool*)(field->ptr) = value; break;
-        case fieldtype::ftint: *(int*)(field->ptr) = (int)value; break;
-        case fieldtype::ftuint: *(uint*)(field->ptr) = (uint)value; break;
-        case fieldtype::ftfloat: *(float*)(field->ptr) = (float)value; break;
-        case fieldtype::ftstring: *(string*)(field->ptr) = value ? "true" : "false"; break;
-        default:
-            std::cerr << "error: type error for key '" << name << "'" << std::endl;
-        }
-    }
-}
-
-void Section::set(std::string name, std::string value) {
-    const Field* field = this->field(name);
-    if (field == nullptr) {
-        std::cerr << "warning: unknown key '" << name << "'" << std::endl;
-    } else {
-        switch (field->type) {
-        case fieldtype::ftstring: *(string*)(field->ptr) = value; break;
-        default:
-            std::cerr << "error: type error for key '" << name << "'" << std::endl;
-        }
-    }
-}
-
-void Reader::readSection(Section* section /*nullable*/) {
-    while (hasNext()) {
-        skipWhitespace();
-        if (!hasNext()) {
-            break;
-        }
-        char c = nextChar();
-        if (c == '[') {
-            string name = parseName();
-            Section* section = wrapper->section(name);
-            pos++;
-            readSection(section);
-            return;
-        }
-        pos--;
-        string name = parseName();
-        expect('=');
-        c = peek();
-        if (is_digit(c)) {
-            number_u num;
-            if (parseNumber(1, num)) {
-                if (section)
-                    section->set(name, (double)num.ival);
-            } else {
-                if (section)
-                    section->set(name, num.fval);
-            }
-        } else if (c == '-' || c == '+') {
-            int sign = c == '-' ? -1 : 1;
-            pos++;
-            number_u num;
-            if (parseNumber(sign, num)) {
-                if (section)
-                    section->set(name, (double)num.ival);
-            } else {
-                if (section)
-                    section->set(name, num.fval);
-            }
-        } else if (is_identifier_start(c)) {
-            string identifier = parseName();
-            if (identifier == "true" || identifier == "false") {
-                bool flag = identifier == "true";
-                if (section) {
-                    section->set(name, flag);
-                }
-            } else if (identifier == "inf") {
-                if (section) {
-                    section->set(name, INFINITY);
-                }
-            } else if (identifier == "nan") {
-                if (section) {
-                    section->set(name, NAN);
-                }
-            }
-        } else if (c == '"' || c == '\'') {
-            pos++;
-            string str = parseString(c);
-            if (section) {
-                section->set(name, str);
-            }
-        } else {
-            throw error("feature is not supported");
-        }
-        expectNewLine();
-    }
-}
+#include "toml.hpp"
+
+#include "commons.hpp"
+#include "../data/setting.hpp"
+#include "../data/dynamic.hpp"
+#include "../util/stringutil.hpp"
+#include "../files/settings_io.hpp"
+
+#include <math.h>
+#include <iostream>
+#include <iomanip>
+#include <sstream>
+#include <assert.h>
+
+using namespace toml;
+
+class Reader : BasicParser {
+    SettingsHandler& handler;
+
+    void skipWhitespace() override {
+        BasicParser::skipWhitespace();
+        if (hasNext() && source[pos] == '#') {
+            skipLine();
+            if (hasNext() && is_whitespace(peek())) {
+                skipWhitespace();
+            }
+        }
+    }
+    void readSection(const std::string& section) {
+        while (hasNext()) {
+            skipWhitespace();
+            if (!hasNext()) {
+                break;
+            }
+            char c = nextChar();
+            if (c == '[') {
+                std::string name = parseName();
+                pos++;
+                readSection(name);
+                return;
+            }
+            pos--;
+            std::string name = section+"."+parseName();
+            expect('=');
+            c = peek();
+            if (is_digit(c)) {
+                auto num = parseNumber(1);
+                if (handler.has(name)) {
+                    handler.setValue(name, num);
+                }
+            } else if (c == '-' || c == '+') {
+                int sign = c == '-' ? -1 : 1;
+                pos++;
+                auto num = parseNumber(sign);
+                if (handler.has(name)) {
+                    handler.setValue(name, num);
+                }
+            } else if (is_identifier_start(c)) {
+                std::string identifier = parseName();
+                if (handler.has(name)) {
+                    if (identifier == "true" || identifier == "false") {
+                        bool flag = identifier == "true";
+                        handler.setValue(name, flag);
+                    } else if (identifier == "inf") {
+                        handler.setValue(name, INFINITY);
+                    } else if (identifier == "nan") {
+                        handler.setValue(name, NAN);
+                    }
+                }
+            } else if (c == '"' || c == '\'') {
+                pos++;
+                std::string str = parseString(c);
+                if (handler.has(name)) {
+                    handler.setValue(name, str);
+                }
+            } else {
+                throw error("feature is not supported");
+            }
+            expectNewLine();
+        }
+    }
+
+public:
+    Reader(
+        SettingsHandler& handler,
+        std::string_view file, 
+        std::string_view source) 
+    : BasicParser(file, source), handler(handler) {
+    }
+
+    void read() {
+        skipWhitespace();
+        if (!hasNext()) {
+            return;
+        }
+        readSection("");
+    }
+};
+
+void toml::parse(
+    SettingsHandler& handler, 
+    const std::string& file, 
+    const std::string& source
+) {
+    Reader reader(handler, file, source);
+    reader.read();
+}
+
+std::string toml::stringify(SettingsHandler& handler) {
+    auto& sections = handler.getSections();
+
+    std::stringstream ss;
+    for (auto& section : sections) {
+        ss << "[" << section.name << "]\n";
+        for (const std::string& key : section.keys) {
+            ss << key << " = ";
+            auto setting = handler.getSetting(section.name+"."+key);
+            assert(setting != nullptr);
+            if (auto integer = dynamic_cast<IntegerSetting*>(setting)) {
+                ss << integer->get();
+            } else if (auto number = dynamic_cast<NumberSetting*>(setting)) {
+                ss << number->get();
+            } else if (auto flag = dynamic_cast<FlagSetting*>(setting)) {
+                ss << (flag->get() ? "true" : "false");
+            } else if (auto string = dynamic_cast<StringSetting*>(setting)) {
+                ss << util::escape(string->get());
+            }
+            ss << "\n";
+        }
+        ss << "\n";
+    }
+    return ss.str();
+}
--- a/src/coders/toml.h
+++ b/src/coders/toml.h
@ -1,68 +0,0 @@
-#ifndef CODERS_TOML_H_
-#define CODERS_TOML_H_
-
-#include <string>
-#include <vector>
-#include <unordered_map>
-
-#include "commons.h"
-
-namespace toml {
-    enum class fieldtype {
-        ftbool,
-        ftint,
-        ftuint,
-        ftfloat,
-        ftstring,
-    };
-
-    struct Field {
-        fieldtype type;
-        void* ptr;
-    };
-
-    class Section {
-        std::unordered_map<std::string, Field> fields;
-        std::vector<std::string> keyOrder;
-        std::string name;
-        void add(std::string name, Field field);
-    public:
-        Section(std::string name);
-        void add(std::string name, bool* ptr);
-        void add(std::string name, int* ptr);
-        void add(std::string name, uint* ptr);
-        void add(std::string name, float* ptr);
-        void add(std::string name, std::string* ptr);
-
-        const Field* field(std::string name) const;
-
-        void set(std::string name, double value);
-        void set(std::string name, bool value);
-        void set(std::string name, std::string value);
-    
-        std::string getName() const;
-        const std::vector<std::string>& keys() const;
-    };
-
-    class Wrapper {
-        std::unordered_map<std::string, Section*> sections;
-        std::vector<std::string> keyOrder;
-    public:
-        ~Wrapper();
-        Section& add(std::string section);
-        Section* section(std::string name);
-
-        std::string write() const;
-    };
-
-    class Reader : public BasicParser {
-        Wrapper* wrapper;
-        void skipWhitespace() override;
-        void readSection(Section* section);
-    public:
-        Reader(Wrapper* wrapper, std::string file, std::string source);
-        void read();
-    };
-}
-
-#endif // CODERS_TOML_H_
--- a/src/coders/toml.hpp
+++ b/src/coders/toml.hpp
@ -0,0 +1,20 @@
+#ifndef CODERS_TOML_HPP_
+#define CODERS_TOML_HPP_
+
+#include "commons.hpp"
+
+#include <string>
+
+class SettingsHandler;
+
+namespace toml {
+    std::string stringify(SettingsHandler& handler);
+
+    void parse(
+        SettingsHandler& handler, 
+        const std::string& file, 
+        const std::string& source
+    );
+}
+
+#endif // CODERS_TOML_HPP_
--- a/Show More
+++ b/Show More