Detect WebGL availability?

Is there a way to detect WebGL availability?

I'm working on a game that requires WebGL.

I would like to be able to detect a lack of WebGL support, and display a, "This game requires WebGL", notice.

--- Edit:

I just thought of a workaround.

I can make my "WebGL Required" notice cover the game's title screen, and then place a WebGL shader on it that makes it transparent. If WebGL is working, then you won't see the notice. If WebGL is not working then the notice will show up.

I'm still interested to know if there is an event condition that can check for WebGL support, if anyone knows of one.

Thanks.

fisholith You can display on screen if you game is currently using Canvas/WebGL.

I made you a Capx check it out and let me know if this is what you are looking for.

https://www.dropbox.com/s/kbf03l3vq84yf ... nning.capx

Edit to your Edit: In that Capx is a Expression/Event that checks if WebGL is working!

can i for example check device in order to enable or desable webgl ?

for exemple ... detect if its iphone 4 then disable webgl else activate it ???

The system condition 'Effects are supported' is true when WebGL is supported, and the system expression 'renderer' returns "webgl" in WebGL mode (else "canvas2d").

Wow, very helpful replies.

Thanks Ashley, "Effects are supported" sounds like exactly what I'm looking for.

Likewise SHG, thanks for making a demo cap. That's awesome.