[Bug 109519] Input sample mask has unexpected values

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109519

Danylo <danylo.piliaiev at gmail.com> changed:

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--- Comment #1 from Danylo <danylo.piliaiev at gmail.com> ---
Created attachment 143510
  --> https://bugs.freedesktop.org/attachment.cgi?id=143510&action=edit
resulting image on anv

Hi, sorry for the delay.

I checked an output of the test in RenderDoc and saw this (see attachment).
There is a diagonal of pixels having a *wrong* mask.

It is happening because this test draws a big triangle which covers the whole
render area and this triangle is being clipped which divides it and creates new
geometry.

So on this diagonal there are two fragments per one pixel and to get the right
coverage you should add their coverages together.

e.g. you can achieve this by having ssbo and atomic adding sample mask to the
corresponding fragment's position (suggested by Lionel on irc).

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