Version: 2021.1
Embedded Resources on WebGL
WebGL Player settings

Getting started with WebGL development

This section provides an overview of the platform support and other useful technical information required to build your project using the WebGL option.

Technical Overview

Unity uses the emscriptenThe toolchain that Unity uses to convert from C and C++ to WebAssembly. More info
See in Glossary
compiler toolchain to cross-compile the Unity runtime code (written in C and C++) into WebAssembly (also known as Wasm). It is designed to be small in size, load-time and memory efficient as well as able to deliver close to native speed execution. For more information about WebAssembly in Unity, check this blog post.

To convert the .NET game code (your C# scripts) into WebAssembly, we use a technology called IL2CPPA Unity-developed scripting back-end which you can use as an alternative to Mono when building projects for some platforms. More info
See in Glossary
. IL2CPP takes .NET bytecode and converts it to corresponding C++ source files, which is then compiled using emscripten to convert your scriptsA piece of code that allows you to create your own Components, trigger game events, modify Component properties over time and respond to user input in any way you like. More info
See in Glossary
to Wasm.

Platform support

Unity WebGL content is supported in the current versions of most major browsers on the desktop, however there are differences in the level of support offered by the different browsers. Mobile devices are not supported by Unity WebGL.

Not all features of Unity are available in WebGL builds, mostly due to constraints of the platform. Specifically:

  • Threads are not supported due to the lack of threading supporting in JavaScript. This applies to both Unity’s internal use of threads to speed up performance, and to the use of threads in script code and managed dlls. Essentially, anything in the System.Threading namespace is not supported.

  • WebGL builds cannot be debugged in Visual Studio. See: Debugging and trouble shooting WebGL builds.

  • Browsers do not allow direct access to IP sockets for networkingThe Unity system that enables multiplayer gaming across a computer network. More info
    See in Glossary
    , due to security concerns. See: WebGL Networking.

  • The WebGL graphics API is equivalent to OpenGL ES 2.0 and 3.0, which has some limitations. See: WebGL Graphics.

  • WebGL builds use a custom backend for Audio, based on the Web Audio API. This supports only basic audio functionality. See: Using Audio in WebGL.

  • WebGL is an AOT platform, so it does not allow dynamic generation of code using System.Reflection.Emit. This is the same on all other IL2CPP platforms, iOSApple’s mobile operating system. More info
    See in Glossary
    , and most consoles.

Embedded Resources on WebGL
WebGL Player settings
Copyright © 2023 Unity Technologies
优美缔软件(上海)有限公司 版权所有
"Unity"、Unity 徽标及其他 Unity 商标是 Unity Technologies 或其附属机构在美国及其他地区的商标或注册商标。其他名称或品牌是其各自所有者的商标。