WebGL (Web Graphics Library) is een JavaScript API voor het renderen van interactieve 3D en 2D graphics binnen elke compatibele webbrowser zonder het gebruik van plug-ins. WebGL daartoe worden een API die nauw overeenkomt met OpenGL ES 2.0 die kunnen worden gebruikt in HTML5 <canvas> elementen.
Ondersteuning voor WebGL is aanwezig in Firefox 4+, Google Chrome 9+, Opera 12+, Safari 5.1+ en Internet Explorer 11+; echter, moet het apparaat van de gebruiker ook hardware hebben die deze functies ondersteunt.
Het <canvas> element wordt ook gebruikt door Canvas 2D om 2D graphics te tonen op webpagina's.
Referenties
Handleidingen en Tutorials
- WebGL tutorial: Een beginners gids naar WebGL kern concepten. Een goede plek om te beginnen wanneer je nog geen WebGL ervaring hebt.
- 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.
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. |
| WebGL 2.0 | Editor's Draft |
Browser compatibility
| Feature | Firefox (Gecko) | Chrome | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 4.0 (2.0) | 9 | 11 | 12[1] | 5.1[1] |
OES_texture_float |
6.0 (6.0) | ? | ? | ? | ? |
OES_standard_derivatives |
10.0 (10.0) | ? | ? | ? | ? |
EXT_texture_filter_anisotropic |
13.0 (13.0) | ? | ? | ? | ? |
WEBGL_compressed_texture_s3tc |
15.0 (15.0) | ? | ? | ? | ? |
drawingBufferWidth and drawingBufferHeight attributes |
9.0 (9.0) | ? | ? | ? | ? |
| Feature | Firefox Mobile (Gecko) | Chrome for Android | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | 4 | 25[1] | Niet ondersteund | 12[1] | 8.1 |
drawingBufferWidth and drawingBufferHeight attributes |
9.0 (9.0) | 25 | ? | ? | ? |
OES_texture_float |
6.0 (6.0) | 25 | ? | ? | ? |
OES_standard_derivatives |
10.0 (10.0) | 25 | ? | ? | ? |
EXT_texture_filter_anisotropic |
13.0 (13.0) | 25 | ? | ? | ? |
OES_element_index_uint |
? | 25 | ? | ? | ? |
OES_vertex_array_object |
? | 25 | ? | ? | ? |
WEBGL_compressed_texture_s3tc |
15.0 (15.0) | 25WEBKIT_ | ? | ? | ? |
WEBKIT_EXT_texture_filter_nisotropic |
Niet ondersteund | 25 | Niet ondersteund | Niet ondersteund | ? |
[1] The implementation of this feature is experimental.
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 experimental-webgl2 in the future for testing.
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 isfalseby default. webgl.disable_extensions- A Boolean property that, when
true, disables all WebGL extensions. This isfalseby default.