[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 #9 from Fritz Koenig <frkoenig at chromium.org> ---
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?

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