EaglercraftX 1.8

Play Minecraft 1.8 in your browser, supports singleplayer and multiplayer

This repository contains:

• Utilities to decompile Minecraft 1.8 and apply patch files to it
• Source code to provide the LWJGL keyboard, mouse, and OpenGL APIs in a browser
• Patch files to mod the Minecraft 1.8 source code to make it browser compatible
• Browser-modified portions of Minecraft 1.8's open-source dependencies

This repository does NOT contain:

• Any portion of the decompiled Minecraft 1.8 source code or resources
• Any portion of Mod Coder Pack and it's config files
• Data that can be used alone to reconstruct portions of the game's source code

Getting Started:

To compile the latest version of the JavaScript client, on Windows:

1. Make sure you have at least Java 11 installed and added to your PATH, it is recommended to use Java 17
2. Download (clone) this repository to your computer
3. Double click CompileLatestClient.bat, a GUI resembling a classic windows installer should open
4. Follow the steps shown to you in the new window to finish compiling

To compile the latest version of the JavaScript client, on Linux/macOS:

1. Make sure you have at least Java 11 installed, it is recommended to use Java 17
2. Download (clone) this repository to your computer
3. Open a terminal in the folder the repository was cloned to
4. Type chmod +x CompileLatestClient.sh and hit enter
5. Type ./CompileLatestClient.sh and hit enter, a GUI resembling a classic windows installer should open
6. Follow the steps shown to you in the new window to finish compiling

To set up the development environment

1. Prepare the required files in the mcp918 folder (readme)
2. Run the build_init script
3. Run the build_make_workspace script

Browser Compatibility

The JavaScript runtime of EaglercraftX 1.8 is currently known to work on browsers as old as Chrome 38 on Windows XP, the game supports both WebGL 1.0 and WebGL 2.0 however features such as dynamic lighting and PBR shaders require WebGL 2.0. The game also supports mobile browsers that don't have a keyboard or mouse, the game will enter touch screen mode automatically when touch input is detected. The game also includes an embedded OGG codec (JOrbis) for loading audio files on iOS where the browsers don't support loading OGG files in an AudioContext.

WebAssembly GC Support

EaglercraftX 1.8 also has an experimental WebAssembly GC (WASM-GC) runtime, almost all of the features supported on the JavaScript runtime are also supported on the WebAssembly GC runtime, however it is still incompatible with several major browsers (especially Safari) and will not run in Chrome unless you can access the chrome://flags menu or request an origin trial token from Google for your website. Its based on experimental technology and may still crash sometimes, mostly due to browser bugs. Hopefully in the coming months the required feature (JSPI, WebAssembly JavaScript Promise Integration) will become enabled by default on the Chrome browser. It performs significantly better than the JavaScript client, around 50% more FPS and TPS in some cases, and will hopefully replace it someday. Just make sure you enable VSync when you play it, otherwise the game will run "too fast" and choke the browser's event loop, causing input lag.

There is no GUI for compiling the WASM-GC client at the moment, you need to compile it using the MakeWASMClientBundle script in the development environment.

Singleplayer

EaglercraftX 1.8 fully supports singleplayer mode through an integrated server. Worlds are saved to your browser's local storage and are available even if your device does not have an internet connection. You can also import and export worlds in EaglercraftX as EPK files to copy them between devices and send them to your friends.

You can also import and export your existing vanilla Minecraft 1.8 worlds into EaglercraftX using ZIP files if you want to try playing all your old 1.8 maps in a modern browser. The glitch that caused some chunks to become corrupt when exporting worlds as vanilla in Eaglercraft 1.5.2 no longer happens in EaglercraftX 1.8, its perfect now. Beware that the inventories of LAN world players are not saved when the world is converted to vanilla, and pets (dogs, cats, horses, etc) might sometimes forget their owners due to the UUID changes.

Shared Worlds

This feature used to be known as "LAN Worlds" but has been renamed to "Shared Worlds" to avoid confusion

If you would like to invite other players to join your singleplayer world and play the game together, use the "Invite" button in the pause menu. You can configure gamemode and cheats for the other players joining your world, you can also decide if you would like to hide your world from other people on your wifi network or advertise your world to them. If hidden is "off" then other people on your same wifi network will see your world listed on their game's "Multiplayer" screen with all of their servers like how sharing LAN worlds behave in vanilla Minecraft 1.8.

Once you press "Start Shared World", EaglercraftX 1.8 will give you a "join code" (usually 5 letters) to share with your friends. On a different device, go the "Multiplayer" screen and press "Direct Connect" and press "Join Shared World", enter the join code given to you when you started the shared world and press "Join World". Given a few seconds, the client should successfully be able to join your shared world from any other device on the internet that also has unrestricted internet access. If it does not work, check the "Network Settings" screen and make sure you and your friends all have the same set of shared world relay URLs configured or your clients will not be able to find each other.

If you would like to host your own relay, the JAR file and instructions can be downloaded from the "Network Settings" screen in the client. EaglercraftX 1.8 uses the same "LAN world" relay server that is used by Eaglercraft 1.5.2, however there have been several bug fixes. The current version is available in the sp-relay/SharedWorldRelay folder.

PBR Shaders

EaglercraftX 1.8 includes a deferred physically-based renderer modeled after the GTA V rendering engine with many new improvements and a novel raytracing technique for fast realistic reflections. It can be enabled in the "Shaders" menu in the game's options screen. Shader packs in EaglercraftX are just a component of resource packs, so any custom shaders you install will be in the form of a resource pack. EaglercraftX also comes with a very well optimized built-in PBR shader pack and also a built-in PBR material texture pack to give all blocks and items in the game realistic lighting and materials that looks better than most vanilla Minecraft shader packs. The default shader and texture packs were created from scratch by lax1dude, shaders packs made for vanilla Minecraft will not work in EaglercraftX and no shaders in EaglercraftX were taken from vanilla Minecraft shader packs. The shaders are not available in WebGL 1.0 mode or if floating point HDR render targets are not fully supported.

Voice Chat

EaglercraftX 1.8 includes an integrated voice-chat service that can be used in shared worlds and also on multiplayer servers when it is enabled by the server owner. This feature also uses WebRTC like shared worlds, so be careful that you don't leak your IP address accidentally by using it on a public server. If you own a website and don't want people to use voice chat on it, edit the eaglercraftXOpts variable in your index.html and add allowVoiceClient: false.

Resource Packs

EaglercraftX 1.8 allows you to use any vanilla Minecraft 1.8 resource pack in your browser by importing it as a zip file, resource packs are saved to your browser's local storage and are saved between page refreshes. This can be used to add the original C418 soundtrack back into the game, download and import this pack to add music back to Eaglercraft. A known bug with the debug desktop runtime is that sound files in resource packs do not play, this may be fixed in the future but is not a high priority issue.

If you are creating a resource pack and want to disable the blur filter on the main menu panorama, create a file called assets/minecraft/textures/gui/title/background/enable_blur.txt in your pack and set it's contents to enable_blur=0

Making a Server

To make a server for EaglercraftX 1.8 the recommended software to use is EaglercraftXServer ("EaglerXServer"), which you can get from lax1dude here: https://lax1dude.net/eaglerxserver/

Launch Options

The EaglercraftX 1.8 client is configured primarily through a variable called window.eaglercraftXOpts that must be set before the client starts up.

The default eaglercraftXOpts values is this:

const relayId = Math.floor(Math.random() * 3);
window.eaglercraftXOpts = {
    demoMode: false,
    container: "game_frame",
    assetsURI: "assets.epk",
    localesURI: "lang/",
    worldsDB: "worlds",
    servers: [
        { addr: "ws://localhost:8081/", name: "Local test server" }
    ],
    relays: [
        { addr: "wss://relay.deev.is/", comment: "lax1dude relay #1", primary: relayId == 0 },
        { addr: "wss://relay.lax1dude.net/", comment: "lax1dude relay #2", primary: relayId == 1 },
        { addr: "wss://relay.shhnowisnottheti.me/", comment: "ayunami relay #1", primary: relayId == 2 }
    ]
};

List of available options

• container: the ID of the HTML element to create the canvas in (required)
• assetsURI: the URL of the assets.epk file (required)
• localesURI: the URL where extra .lang files can be found
• lang: the default language to use for the game (like "en_US")
• joinServer: server address to join when the game launches
• worldsDB: the name of the IndexedDB database to store worlds in
• resourcePacksDB: the name of the IndexedDB database to store resource packs in
• demoMode: whether to launch the game in java edition demo mode
• servers: a list of default servers to display on the Multiplayer screen
• relays: the default list of shared world relays to use for invites
• checkGLErrors: if the game should check for opengl errors
• checkShaderGLErrors: enables more verbose opengl error logging for the shaders
• enableDownloadOfflineButton: whether to show a "Download Offline" button on the title screen
• downloadOfflineButtonLink: overrides the download link for the "Download Offline" button
• html5CursorSupport: enables support for showing the CSS "pointer" cursor over buttons
• allowUpdateSvc: enables the certificate-based update system
• allowUpdateDL: allows the client to download new updates it finds
• logInvalidCerts: print update certificates with invalid signatures to console
• enableSignatureBadge: show a badge on the title screen indicating if digital signature is valid
• checkRelaysForUpdates: proprietary feature used in offline downloads
• allowVoiceClient: can be used to disable the voice chat feature
• allowFNAWSkins: can be used to disable the high poly FNAW skins
• localStorageNamespace: can be used to change the prefix of the local storage keys (Default: "_eaglercraftX")
• enableMinceraft: can be used to disable the "Minceraft" title screen
• crashOnUncaughtExceptions: display crash reports when window.onerror is fired
• openDebugConsoleOnLaunch: open debug console automatically at launch
• fixDebugConsoleUnloadListener: close debug console beforeunload instead of unload
• forceWebViewSupport: if the server info webview should be allowed even on browsers without the required safety features
• enableWebViewCSP: if the csp attibute should be set on the server info webview for extra security
• enableServerCookies: can be used to disable server cookies
• allowServerRedirects: if servers should be allowed to make the client reconnect to a different address
• autoFixLegacyStyleAttr: if the viewport meta tag and style attributes on old offline downloads and websites should be automatically patched
• showBootMenuOnLaunch: if the client should always show the boot menu on every launch
• bootMenuBlocksUnsignedClients: if the boot menu should only be allowed to launch signed clients
• allowBootMenu: can be used to disable the boot menu entirely
• forceProfanityFilter: if the profanity filter should be forced enabled
• forceWebGL1: if the game should force the browser to only use WebGL 1.0 for the canvas
• forceWebGL2: if the game should force the browser to only use WebGL 2.0 for the canvas
• allowExperimentalWebGL1: if the game should be allowed to create an experimental-webgl context
• useWebGLExt: can be used to disable all OpenGL ES extensions to test the game on a pure WebGL 1.0/2.0 context
• useDelayOnSwap: if the game should setTimeout(..., 0) every frame instead of using MessageChannel hacks
• useJOrbisAudioDecoder: if OGG vorbis files should be decoded using the JOrbis Java OGG decoder instead of using the browser
• useXHRFetch: if the game should use XMLHttpRequest for downloading resources instead of the fetch API
• useVisualViewport: if the game should resize some GUIs relative to window.visualViewport (needed on mobile browsers when the keyboard is open)
• deobfStackTraces: can be used to disable the runtime stack-trace deobfuscation, reduces micro stutters if the game is logging errors
• disableBlobURLs: if the game should use data: URLs instead of blob: URLs for loading certain resources
• eaglerNoDelay: can be used to disable "Vigg's Algorithm", an algorithm that delays and combines multiple EaglercraftX packets together if they are sent in the same tick (does not affect regular Minecraft 1.8 packets)
• ramdiskMode: if worlds and resource packs should be stored in RAM instead of IndexedDB
• singleThreadMode: if the game should run the client and integrated server in the same context instead of creating a worker object
• enableEPKVersionCheck: if the game should attempt to bypass the browser's cache and retry downloading assets.epk when its outdated
• enforceVSync: (WASM only) if the game should automatically re-enable VSync at launch if its disabled
• hooks: can be used to define JavaScript callbacks for certain events
  • localStorageSaved: JavaScript callback to save local storage keys (key, data)
  • localStorageLoaded: JavaScript callback to load local storage keys (key) returns data
  • crashReportShow: JavaScript callback when a crash report is shown (report, customMessageCB)
  • screenChanged: JavaScript callback when the screen changes/resizes (screenName, scaledWidth, scaledHeight, realWidth, realHeight, scaleFactor)

Using Hooks

You may want to implement some custom logic for loading/saving certain local storage keys. The eaglercraftXOpts hooks section can be used to override the client's local storage load and save functions. Currently, local storage keys are used to save game settings, the user's profile, custom servers, and shared world relays. Worlds and resource packs do not use local storage keys because modern browsers limit local storage keys to only 5 megabytes per domain which is too small for saving entire worlds and resource packs. Worlds and resource packs are saved using IndexedDB.

window.eaglercraftXOpts = {
    ...
    ...
    ...
    hooks: {
        localStorageSaved: function(key, data) {
            // 'key' is local storage key name as a string
            // 'data' is base64-encoded byte array as a string
            // function returns nothing
        },
        localStorageLoaded: function(key) {
            // 'key' is local storage key name as a string
            // function returns a base64-encoded byte array as a string
            // function returns null if the key does not exist
        }
    }
}

Be aware that the client will still save the key to the browser's local storage anyway even if you define a custom save handler, and will just attempt to load the key from the browser's local storage normally if you return null, these are meant to be used like event handlers for creating backups of keys instead of completely replacing the local storage save and load functions.

On a normal client you will only ever need to handle local storage keys called p (profile), g (game settings), s (server list), r (shared world relays), in your hooks functions. Feel free to just ignore any other keys. It is guaranteed that the data the client stores will always be valid base64, so it is best practice to decode it to raw binary first if possible to reduce it's size before saving it to something like a MySQL database in your backend if you are trying to implement some kind of profile syncing system for your website. The keys already have GZIP compression applied to them by default so don't bother trying to compress them yourself a second time because it won't reduce their size.

Crash Report Hook

The crashReportShow hook can be used to capture crash reports and append additional text to them. It takes two parameters, the crash report as a string and a callback function for appending text. Do not use the callback function outside the body of the hook.

hooks: {
    crashReportShow: function(report, customMessageCB) {
        // 'report' is crash report as a string
        customMessageCB("Hello from crashReportShow hook!");
    }
}

Developing a Client

There is currently no system in place to make forks of 1.8 and merge commits made to the patch files in this repository with the patch files or workspace of the fork, you're on your own if you try to keep a fork of this repo for reasons other than to contribute to it