[Webkit-unassigned] [Bug 73932] Using discard in a fragment shader results in a crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=73932





--- Comment #6 from Dean Jackson <dino at apple.com>  2012-04-04 15:29:24 PST ---
(In reply to comment #2)
> We did bug it to Apple months back but still occurs.

How did you report it? Email, via bugreporter.apple.com or here on bugs.webkit.org? I'd like to track it down if was the latter two.

> It also occurs on Firefox 10+ (but not 9) and also native OpenGL. It crashes in various underlying gl* calls e.g. even glClear if there is an active program.
> 
> I think is something about the shader compilation/validation that's broken with 10.7 and that Radeon driver. The same shaders run on everything else (other Macs and a broad range of Winodws and Linux machines). 
> 
> I narrowed it down more and it was the use of 'gl_FragCoord.w' and 'discard' in a fragment program that caused the issue - knocking out either and it was ok.

Thanks. I'd really like to get an example to see if it reproduces. It sounds like it would need a driver-level fix.

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