[Bug 105224] Webgl Pointclouds flickers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105224

--- Comment #16 from Iago Toral <itoral at igalia.com> ---
I was surprised that this was never caught by Jenkins before, because in
theory, it should affect all situations that involve point sprite functionality
and we have tests for that in Piglit.

I did some investigation and it turns out that the tests are passing because
the point sprite varying is the only input to the FS in these tests and the
hardware has a requirement by which our URB must have at least one entry, so we
were padding the URB size to have exactly one offset. This means that when we
took the number of inputs from the URB size alone we would count 2, the minimum
we can have (each URB offset packs 2 slots), and since the test only required
one, it would work.

I'll try to add another test to piglit that adds some user varyings so we can
replicate the problem and add regression testing for it.

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