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https://github.com/killedbyapixel/os13k

A Tiny OS and Mini Game Engine
https://github.com/killedbyapixel/os13k

codegolf dwitter js13k operating-system shadertoy tinycode

Last synced: 22 days ago
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A Tiny OS and Mini Game Engine

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README 

        
# Welcome to OS13k!

OS13k is a tiny operating system that fits in a 13 kb zip file.



It includes native support for Shadertoys, Dweets, ZzFX sounds, music, trophies, touch input, and much more.



# [Live Demo](https://killedbyapixel.github.io/OS13k) -  [JS13k Submission](https://js13kgames.com/entries/os13k) - [Discord](https://discord.gg/n8vxUcZ)



## What is OS13k?

- OS13k is a tiny web based pseudo OS and game engine designed for creative coding purposes

- The core of OS13k is around 10k zipped including all the system apps

- OS13k can connect with other JS13k games via local storage to add music and trophies

- Users can extend OS13k by addinng their own programs and shaders



## Features

- ZzFX sound effects with support for sound seeds

- ZzFXM music system, player, and visualizer

- Trophy system and viewer

- Centralized input system

- Custom user programs

- Dwitter, ShaderToy, and WebGL support

- GUI with window manger, taskbar, tray and settings

- Mobile/touch support



## Programming Info

- OS13k stores it's list of programs in programs.js

- For fast iteration when developing, most recent active window is opened on startup



Add an icon config to programs.js to register your program, examples...

- [icon, src, width, height, flags, name, help, folder]

- ['?','help.html']

- ['✌️😄','system/systemTest.html',,,full|resize|code|sticky]

- ['🌊','dweets/underwaterCavern.dweet.js']

- ['☯','toys/infiniteYinYangs.shader.txt',500,500,full,'Put instructions here.']



### Programs

- OS13k can open any html file and it will work the same as if opened directly

- Chrome is recommended, but Firefox is also supported

- [Viewing OS13k locally may not work if it treats local files as cross-origin](https://discourse.mozilla.org/t/firefox-68-local-files-now-treated-as-cross-origin-1558299/42493/9)

- Prefix all local storage keys with OS13kYourProgramName to prevent collisions during JS13k (use at least 2 letters)

- When the reload button is clicked, OS13kReload is called if it exists instead of reloading the iframe

- For development we recommend [VSCode](https://code.visualstudio.com/) with the [Live Server Plugin](https://marketplace.visualstudio.com/items?itemName=ritwickdey.LiveServer)

- You can also create a custom program to edit code directly in OS13k



 ### Trophies

 - Trophies are perhaps the most important part of OS13k and have many uses

 - Apps can register trophies for their games, the OS tracks which are unlocked

 - To unlock trophies use OS13k.Trophy(icon, gameName, trophyName, message)

 - You can pass in a value as the message, like a high score for example

 - *HTML tags and commas can not be used in trophy data*

 - When a new trophy is unlocked or the message is changed a popup will automatically appear

 - Total trophy count is shown in the taskbar and the trophy case shows all unlocked trophies

 - *You can use tophies to store data!* Use OS13k.GetTrophy to get a trophy message



### Trophy Functions

 - OS13k.Trophy(game='', icon='', name='', message='') - Unlock a trophy

 - OS13k.GetTrophy(game, name) - Get most recent matching trophy, 0 if no trophy

 - OS13k.Trophies() - Get full list of trophy objects

 

### Sound

- ZzFx sounds are supported by default and several other audio functions are provided

- ZzFX is open source sound effect generator with an easy to use sound designer https://zzfx.3d2k.com/

- A seeded ZzFX sound player is available to save space with much smaller sound calls

- OS13k.PlaySeed(seed, lengthScale=1, volume=1, randomness=.05, frequency) - Play a zzfx sound from seed

- OS13k.PlaySamples(samples, sampleRate=44100) - Play audio samples

- OS13k.Note(semitoneOffset=0, rootNoteFrequency=440) - Get frequency of a note on a musical scale

- OS13k.Speak(text, language='en', stopSpeech, volume=1, rate=1, pitch=1) - Play speech of the text

- Seeds can also be strings (will be hashed) or full ZzFX sounds

- A custom gain node is created for every sound, use sound.gain.gain.value to change



### Music

- [ZzFXM by Keith Clark](https://github.com/keithclark/ZzFXM) is the music player

- OS13k.PlayMusic(song) - plays the song with zzfxm

- OS13k.GetAnalyser() - returns a 32x32 music analyser canvas

- OS13k.GetAnalyserData(i) - returns index into a 32 length array of frequency volumes normalized between 0-1

- OS13k.StringToMusic(string, validate) - Converts a string to a music array and checks if valid



### System Calls

- The OS13k object is set in your program after load, if you need it on load use parent.OS13k

- zzfx also becomes available after your program loads and can be called directly

- OS13k.CreateShader(canvas, shaderCode) - Create a shadertoy compatible webgl shader

- OS13k.RenderShader(canvas, shaderProgram, time=0, frame=0) - Render a shader

- OS13k.StripHTML(string) - Removes all HTML tags in a string

- OS13k.Hash(string) - Returns numeric hash code for a string

- OS13k.Popup(html, speak) - Shows a popup with html body and optional speech and sound



### Math Library

- OS13k.Random(max=1, min=0) - Get a seeded random value clamped between min and max

- OS13k.randomSeed - You must set the seed before calling OS13k.Random

- OS13k.Clamp(a, max=1, min=0) - Clamp value between max and min

- OS13k.Percent(v, a, b) - Get clamped percent between a and b

- OS13k.Lerp(p, a, b) - Lerp clamped percent between a and b



### Dweets and Shadertoys

- Programs with the extension .dweet.js or .shader.txt or will automatically load as Dweets or Shadertoys!

- Dweets and Shadertoys are automatically paused when they don't have focus (after a 1 second warmup)

- They also automatically have the show code option by default unless explictly disabled

- Dweets can do anything that other programs can do including calling OS13k functions and ZzFX

- Dweets and Shadertoys are automatically paused when not focused (unless awake is set)

- Shaders support iTime, iFrame, iMouse, iResolution, and iChannel0

- iChannel0 is an image of the previous frame, this can be used to make effects or store game logic



### Input System

- OS13k provides an easy to use input system to help eliminate redundant code

- Call OS13k.Input(window) to get the input object

- the object format is {x, y, keypress, keydown, mousex, mousey, mousepress, mousedown}

- x and y is a -1 to 1 direction from WASD or direction buttons

- mousex and mousey is the mouse position

- wheel is the mouse wheel delta

- keypress and mousepress are arrays, an element is 1 if that key is pressed

- keydown and mousedown are arrays, an element is 1 if that key is down

- *See System/Test/InputTest for an example*



### Program Settings and Defaults

- name - Display name (if absent will build nice name from camel case src filename)

- src - Source filename

- icon - Can contain html tags, fits about 2 emojis

- don't close html tags, they will automatically be closed

- width (720) and height (405) - Size of window (default is 16:9 aspect)

- help (optional) - Help message, shows an icon on the window's titlebar (try to keep it short)

- author (optional) - Name of creator

- sticky (0) - Will automatically open of program on restart if it was open

- reload (1) - Shows the reload option

- awake (1) - Prevents window dim and and pausing dweets/shaders when not focused

- full (1) - Enables full screen option

- code (0) - Shows code option, defaults to true for dweets/shaders, help is shown instead if it exists

- rezize (1) - Allows resizing the window

- shortcut (0) - Shows shortcut icon on the desktop

 

### User Programs

 - You can create and access custom programs in the user programs folder

 - *User programs have the same capabilities as any other program!*

 - It auto detects HTML (starts with <), Shadertoy (has void mainImage), or Dweet

 - This can be used to iterate on dweets or small shaders, or to load a full program.

 - Drag and drop a file into the text box to load it

 - The screenshot button is available for Dweets and Shadertoys

 - User Dweets has loop protection to help prevent freeze ups, though it can still occur

 - Press Alt+Enter to reload when live edit is disabled

 - User programs will not run until clicked to prevent executing bad code



 ### Any JS13k game can add trophies and music, even if not part of OS13k!

 - *To add a trophy or music track, just save a special key to localStorage!*

 - The smallest way to add a single trophy (like for winning) is localStorage['OS13kTrophy,Icon,GameName'] = ''

 - For more control use localStorage['OS13kTrophy,Icon,Game Name,Trophy Name'] = Message

 - You can change the message to update the trophy, like a highscore for example

 - Music works the same way, use localStorage['OS13kMusic,Song Name'] = JSON.stringify(song)

 - OS13k automatically checks localStorage and display popups for new trophies and songs from other games

 - This is possible because all JS13k games share the same local storage! Pretty cool right?

 - You can test locally by pasting your trophy code into the OS13k's console app

 

## Contribuitors



Most of the OS was created by myself, but there were many other people helping out. Thank you to everyone for their efforts, I could not have done it alone!



- Keith Clark - ZzFXM

- Tomxor - Don't Fall

- Niklas Berg - Shedding Snake

- Pavel - Visualizer and 404

- Rodrigo Siqueira - Sticky Note

- Kang Seonghoon - Roadroller



Additional help by...



- Katkip, Jaburns, Xem, Rebecca König, Cantelope, DaSpider, Lionleaf, Yurume, Magna, Thomas Brierley, Nicholas Ortenzio, Yuanchuan, Jani Ylikangas, Martinn Kleppe, Erik Sombroek



![OS13k Image](/favicon.ico)