[Bug 111247] [WebGL Conformance] clipping work incorrectly on y-axis

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111247

--- Comment #11 from Tapani Pälli <lemody at gmail.com> ---
(In reply to Fritz Koenig from comment #9)
> I see a few issues in this bug.  I dug into the clipping issue as it applies
> to GL_MESA_framebuffer_flip_y in
> (https://bugs.chromium.org/p/chromium/issues/detail?id=964010#c22)
> 
> My takeaway was that Mesa was performing differently with system
> framebuffers and user framebuffers.  GL_MESA_framebuffer_flip_y allows the
> user framebuffer to follow the path of the system framebuffer and therefore
> come out upside down. 
>  But, according to the spec they are both correct because of the diamond
> exit rule.
> 
> I'm also a little confused how this is affecting FF.  Chromium is using the
> extension for GLES.  Is FF also using the extension?  Or did enabling this
> extension change the functionality of Mesa when the extension did not
> enabled?

Independent of what's going on with FF, this bug is easy to reproduce with
chrome. I noticed that the subtest starts to pass if I disable
GL_MESA_framebuffer_flip_y extension in i965 driver, maybe chrome does
something wrong when the extension is enabled?

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