Report lack of support of preserve-3d in Chrome if it's disabled thanks to the GPU

[gvsmirnov]

(From #762 (comment))

There is a peculiar case of when the browser reports that it "supports" preserve-3d, but actually doesn't. Reproduces on most linux machines in Google Chrome.

The thing is that it does not render preserve-3d on some hardware.

See this test case:
http://jsfiddle.net/bZ5sE/3/ -- on my machine (see the configuration here: jmpressjs/jmpress.js#133) it says "Looks like we have preserve-3d support - you should see red text below", but the red text itself is not visible.

I do realize that this is likely a bug to be reported to Webkit/Chromium, but it could take ages before it's fixed, and everyone has updated. So a workaround is a good idea.

[patrickkettner]

Have you reported this to crbug or webkit's bugzilla?

[gvsmirnov]

@patrickkettner not as of yet, I'm still trying to figure out where exactly the problem lies. As soon as it's clear, I will do so. (I've also looked for open issues there, but found none)

[patrickkettner]

You already have a pretty reduced test-case. I wouldn't wait, personally. Could be something very simple for them to fix, always hard to tell without being intimately familiar with the guts of the browser.
If I had to guess, though, I would think the GPU is crashing for some reason, or the GPU blacklisting is broken on those machines you mention.

[gvsmirnov]

Corresponding issue on webkit bugzilla: https://bugs.webkit.org/show_bug.cgi?id=125080 (really did take me long)

[patrickkettner]

Did you open one up on crbug.com as well?

[gvsmirnov]

Did now: https://code.google.com/p/chromium/issues/detail?id=324876

[patrickkettner]

beauty. thanks

[patrickkettner]

Unfortunately there isn't anything we can do in this case, as it is effectively a browser bug and only in certain situations ( not to mention that the GPU could crash in between the time that modernizr runs its test and your code runs ). Closing as a result, though am more than open to being persuaded otherwise.

[gvsmirnov]

@patrickkettner yeah, it indeed can't be fixed by Modernizr. Pity, really, as nobody has reacted to the bugs I posted to Chromium/Webkit. Do you happen to know if there is some way I can get someone to look at it? (Yeah, I know I could look at it myself :) )

[patrickkettner]

@paulirish may know someone, but its sortof a weird bug :/ The best thing we can do is to get as many people as possible to star the issue, as that is how google ranks its importance.

[marklundin]

I think the problem is due to the software renderer. In theory render of both hardware and software should produce exactly the same result. However it seems that 'preserve-3d' has not been implemented correctly in the software renderer which results in different outputs.