WebGL API

Support for WebGL is present in Firefox 4+, Google Chrome 9+, Opera 12+, Safari 5.1+ and Internet Explorer 11+; however, the user's device must also have hardware that supports these features.

The <canvas> element is also used by Canvas 2D to do 2D graphics on web pages.

Reference

Standard interfaces

Extensions

Events

• webglcontextlost
• webglcontextrestored
• webglcontextcreationerror

Constants and types

• WebGL constants
• WebGL types

WebGL 2

WebGL 2 is a major update to WebGL which is provided through the WebGL2RenderingContext interface. It is based on OpenGL ES 3.0 and new features include:

• 3D textures,
• Sampler objects,
• Uniform Buffer objects,
• Sync objects,
• Query objects,
• Tranform Feedback objects,
• Promoted extensions that are now core to WebGL 2: Vertex Array objects, instancing, multiple render targets, fragment depth.

See also the blog post "WebGL 2 lands in Firefox" and webglsamples.org/WebGL2Samples for a few demos.

Guides and tutorials

• WebGL tutorial: A beginner's guide to WebGL core concepts. A good place to start if you don't have previous WebGL experience.
• WebGL best practices: Tips and suggestions to improve your WebGL content.
• Using extensions: How to use extensions that are available in WebGL.

Advanced tutorials

• WebGL model view projection: A detailed explanation of the three core matrices that are typically used to represent a 3D object view: the model, view and projection matrices.
• Matrix math for the web: A useful guide to how 3D transform matrices work, and can be used on the web — both for WebGL calculations and in CSS3 transforms.

Resources

• Raw WebGL: An introduction to WebGL A talk by Nick Desaulniers that introduces the basics of WebGL. This is a great place to start if you've never done low-level graphics programming.
• Khronos WebGL site The main web site for WebGL at the Khronos Group.
• Learning WebGL A site with tutorials on how to use WebGL.
• WebGL Fundamentals A basic tutorial with fundamentals of WebGL.
• WebGL playground An online tool for creating and sharing WebGL projects. Good for quick prototyping and experimenting.
• WebGL Academy An HTML/JavaScript editor with tutorials to learn basics of webgl programming.
• WebGL Stats A site with statistics about WebGL capabilities in browsers on different platforms.

Libraries

• glMatrix JavaScript Matrix and Vector library for High Performance WebGL apps
• Sylvester An open source library for manipulating vectors and matrices. Not optimized for WebGL but extremely robust.

Specifications

Specification	Status	Comment
WebGL 1.0	Recommendation	Initial definition. Based on OpenGL ES 2.0
WebGL 2.0	Editor's Draft	Builds on top of WebGL 1. Based on OpenGL ES 3.0.
OpenGL ES 2.0	Standard
OpenGL ES 3.0	Standard

Browser compatibility

Compatibility notes

In addition to the browser, the GPU itself also needs to support the feature. So, for example, S3 Texture Compression (S3TC) is only available on Tegra-based tablets. Most browsers make the WebGL context available through the webgl context name, but older ones need experimental-webgl as well. In addition, the upcoming WebGL 2 is fully backwards-compatible and will have the context name webgl2.

Gecko notes

WebGL debugging and testing

Starting with Gecko 10.0 (Firefox 10.0 / Thunderbird 10.0 / SeaMonkey 2.7), there are two preferences available which let you control the capabilities of WebGL for testing purposes:

webgl.min_capability_mode

A Boolean property that, when true, enables a minimum capability mode. When in this mode, WebGL is configured to only support the bare minimum feature set and capabilities required by the WebGL specification. This lets you ensure that your WebGL code will work on any device or browser, regardless of their capabilities. This is false by default.

webgl.disable_extensions

A Boolean property that, when true, disables all WebGL extensions. This is false by default.

See also

• Canvas
• Compatibility info about WebGL extensions