[Mesa-dev] [Bug 96853] gl_PrimitiveID is zero when rendering points of size > 1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96853

--- Comment #5 from denis.fisseler at tu-dortmund.de ---
(In reply to Roland Scheidegger from comment #3) 
> In theory if there already is a user-provided gs (which doesn't output
> points) then the emulation code doesn't really apply. But I don't really
> know this code (other than knowing this is pretty tricky stuff...).

According to my testing, GS with Mesa3d show a kind of strange mixed behavior.
I have a GS, that fakes wide lines by constructing screen aligned quads from
lines. If I use it in VMware with Ubuntu 16.04 LTS and Mesa3d, it does not
construct wide lines, but only lines of width 1. Now if I abort the GS, using a
return statement right at the beginning of the main method and do not output
anything, lines of width 1 are still shown in the viewport. For those lines
however to be colored correctly, I have to output that color from my GS. So it
seems the geometry output part of the GS is somehow overridden, while other
parts of it are not.

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