[Public WebGL] Blacklisting and get.webgl.org

Gregg Tavares (wrk) [email protected]
Mon Feb 14 00:04:59 PST 2011

On Sun, Feb 13, 2011 at 2:38 PM, Benoit Jacob <[email protected]> wrote:

> ----- Original Message -----
> > Well, the blacklisting of my driver just rolled in with the latest
> > Firefox nightly...and I can report that the blacklist definitely
> > works!
> >
> > One thing that bothers me though is that my web site does the usual
> > WebGL detection - finds a problem and punts the user off to
> > http://get.webgl.org - which (of course) tells me:
> >
> > Your browser doesn't appear to support WebGL.
> > An up-to-date list of browsers that do support WebGL, is available
> > here.
> >
> > ...which of course is untrue. My browser DOES support WebGL - and it's
> > on the "available here" list. So this web page is definitely going to
> > confuse our users. Ideally, it needs to say that my graphics card
> > driver is out of date and provide a convenient link back to nVidia's
> > site to upgrade it...but without being able to get useful data out of
> > the VENDOR/RENDERER/VERSION strings - that's going to be impossible in
> > Firefox.
> One wouldn't want to implement this at the level of the website, anyway.
> What could be useful is if canvas.getContext generated an error message
> string for the website to show the user.
> I'm not sure what the API for this could look like (maybe just let
> getContext pass this string as an exception?), but if an API can be agreed
> on, that would be easy to implement, since we already have the code
> generating this string and it's already exposed to Javascript (we use it in
> about:support).

The API already does this.

#1) Check if your browser supports webgl

 if (!window.WebGLRenderingContext)
    // this browser does not support webgl. Send to get.webgl.org

#2) Try to get a context and handle the error

canvas.addEventListener("webglcontextcreationerror", handleError, false);
ctx = canvas.getContext("webgl");
if (!ctx) {
return; // do nothing if null is returned. The spec REQUIRES that a
// webglcontextcreationerror event generated.

  function handleError(event) {
     // display event.message to user and/or send the user to
get.webgl.org/troubleshooting (which needs to be filled in)

> Benoit
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