unity-webgl

[ English | 中文 ]

unity-webgl provides an easy solution for embedding Unity WebGL builds in your web applications, with two-way communication and interaction between your webApp and Unity application with advanced API's.

🚨 Reminder

v4.x has been updated significantly and the API is not compatible with v3.x and earlier versions. For upgrades, please refer to Changelogs

Based on react-unity-webgl

Features

• 📦 Easy integration, framework-agnostic
• 📩 Bidirectional communication between WebApp and Unity
• ⏰ Comprehensive event handling mechanism
• 🧲 Built-in Vue components (vue2/3)

Installation

npm

npm install unity-webgl

Browser

<script src="https://cdn.jsdelivr.net/npm/unity-webgl/dist/index.min.js"></script>

Quick Start

• Live Demo
• vue3 Demo

🚨 Important:
Communication and interaction with the web application are only possible after the Unity instance is successfully created (when the mounted event is triggered).
Recommended to include a loading progress bar when opening the page.

import UnityWebgl from 'unity-webgl'

const unityContext = new UnityWebgl('#canvas', {
	loaderUrl: 'path/to/unity.loader.js',
	dataUrl: 'path/to/unity.data',
	frameworkUrl: 'path/to/unity.framework.js',
	codeUrl: 'path/to/unity.code',
})

unityContext
	.on('progress', (progress) => console.log('Loaded: ', progress))
	.on('mounted', () => {
		// ⚠️ Unity instance created, ready for communication
		unityContext.sendMessage('GameObject', 'ReceiveRole', 'Tanya')
	})

// For Unity to call
unityContext.addUnityListener('gameStart', (msg) => {
	console.log('from Unity : ', msg)
})
// window.dispatchUnityEvent('gameStart', '{score: 0}')

Vue Demo

<script setup>
	import UnityWebgl from 'unity-webgl'
	import VueUnity from 'unity-webgl/vue'

	const unityContext = new UnityWebgl({
		loaderUrl: 'path/to/unity.loader.js',
		dataUrl: 'path/to/unity.data',
		frameworkUrl: 'path/to/unity.framework.js',
		codeUrl: 'path/to/unity.code',
	})

	unityContext.addUnityListener('gameStart', (msg) => {
		console.log('from Unity : ', msg)
	})
</script>

<template>
	<VueUnity :unity="unityContext" width="800" height="600" />
</template>

API

Constructor

new UnityWebgl(canvas: HTMLCanvasElement | string, config?:UnityConfig)

// or

const unityContext = new UnityWebgl(config: UnityConfig)
unityContext.create(canvas: HTMLCanvasElement | string)

• canvas : Render Unity canvas elements or selectors.
• config : Initializes the Unity application's configuration items.

config

Initializes the Unity application's configuration items.

Property	Type	Description	Required
loaderUrl	string	Unity resource loader file	✅
dataUrl	string	File containing resource data and scenes	✅
frameworkUrl	string	File with runtime and plugin code	✅
codeUrl	string	WebAssembly binary file with native code	✅
streamingAssetsUrl	string	URL for streaming resources	Optional
memoryUrl	string	URL for generated framework files	Optional
symbolsUrl	string	URL for generated Unity code files	Optional
companyName	string	Metadata: Company name	Optional
productName	string	Metadata: Product name	Optional
productVersion	string	Metadata: Product version	Optional
devicePixelRatio	number	Canvas device pixel ratio. @seedevicePixelRatio	Optional
matchWebGLToCanvasSize	boolean	Disable automatic WebGL canvas size sync. @seematchWebGLToCanvasSize	Optional
webglContextAttributes	object	WebGL rendering context options. @seeWebGLRenderingContext	Optional

Methods

Instance methods :

⭐️ create(canvas: HTMLCanvasElement | string): void;

Create a Unity WebGL instance on the specified canvas.

• canvas : canvas element

await unityContext.create('#canvas')

⭐️ unload(): Promise<void>;

Unload the Unity WebGL instance.

await unityContext.unload()

⭐️ sendMessage(objectName: string, methodName: string, value?: any): this;

Send a message to invoke a public method in the Unity scene.

• objectName: Object Name in Unity Scene
• methodName: Unity script method name
• value: Passed value

unityContext.sendMessage('GameObject', 'gameStart', { role: 'Tanya' })

requestPointerLock(): void;

Request pointer lock on the Unity canvas.

takeScreenshot(dataType?: string, quality?: any): string | undefined;

Capture a screenshot of the Unity canvas.

• dataType: Type of image data
• quality: Image quality

const screenshot = unityContext.takeScreenshot('image/jpeg', 0.92)

setFullscreen(enabled: boolean): void;

Toggle fullscreen mode.

unityContext.setFullscreen(true)

Event methods :

on(name: string, listener: EventListener, options?: { once?: boolean }): this;

Register for listening events.

unityContext.on('progress', (progress) => {
	console.log('Progress:', progress)
})

off(name: string, listener?: EventListener): this;

Remove event listener.

unityContext.off('progress', listener)

Unity Communication methods :

addUnityListener(name: string, listener: EventListener, options?: { once?: boolean }): this;

Register a specific listener for Unity to call.

unityContext.addUnityListener('GameStarted', (level) => {
	console.log('Game started at level:', level)
})

// then call it in Unity
window.dispatchUnityEvent('GameStarted', 3)

removeUnityListener(name: string, listener?: EventListener): this;

Remove registered listeners.

unityContext.removeUnityListener('GameStarted', listener)

window.dispatchUnityEvent(name: string, ...args: any[])

The way to dispatch a registered listener on the Unity side. (Calling JS methods in unity)

window.dispatchUnityEvent('GameStarted', 3)

Events

Event Name	Description
beforeMount	Triggered before Unity instance creation
mounted	Triggered after Unity instance creation
beforeUnmount	Triggered before Unity instance unload
unmounted	Triggered after Unity instance unload
progress	Unity resource loading progress
error	Error events
debug	Debug messages from Unity

Unity-JavaScript Communication

• Unity Docs: Interaction with browser scripting

1. Call Unity script functions from JavaScript

const unityContext = new UnityWebgl()

/**
 * @param {string} objectName Name of an object in your scene.
 * @param {string} methodName Public method name.
 * @param {any} value Passed value.
 */
unityContext.sendMessage('GameObject', 'StartGame', { role: 'Tanya' })

2. Call JavaScript functions from Unity scripts

1. First register the listener for Unity to call via addUnityListener on the web side.

unityContext.addUnityListener('gameStart', (level) => {
	console.log('Game started at level:', level)
})

2. Add the registered gameStart method to your Unity project.

// javascript_extend.jslib
mergeInto(LibraryManager.library, {
	Hello: function () {
		window.alert('Hello, world!')
	},

	GameStart: function (level) {
		//window.alert(UTF8ToString(str));
		window.dispatchUnityEvent('gameStart', UTF8ToString(level))
	},
})

3. Call these functions in unity's C# scripts:

using UnityEngine;
using System.Runtime.InteropServices;

public class WebGLPluginJS : MonoBehaviour
{
    [DllImport("__Internal")]
    public static extern void Hello();

    [DllImport("__Internal")]
    public static extern void GameStart(string level);

    void Start()
    {
        Hello();
        GameStart("2");
    }
}

Issues

• Keyboard Input and Focus Handling
• Debug and troubleshoot Web builds
• Web performance considerations

Contributing

Contributions are welcome! Please submit a Pull Request.

License

Apache-2.0 License

Support

For issues or questions, please file an issue on the GitHub repository.