[Mesa-dev] [Mesa-stable] [PATCH] nvc0: do not follow the push path for indexed draws

Samuel Pitoiset samuel.pitoiset at gmail.com
Wed Jul 27 15:01:45 UTC 2016

On 07/27/2016 03:45 PM, Ilia Mirkin wrote:
> On Wed, Jul 27, 2016 at 9:42 AM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
>> On 8 June 2016 at 18:08, Samuel Pitoiset <samuel.pitoiset at gmail.com> wrote:
>>> This fixes a lot of flickering in The Talos Principle on Fermi+
>>> (tested on both GF119 and GK106). My guess is that some indices
>>> and/or some vertex attributes are incorrectly set when emitting
>>> data directly into the command stream rather than uploading a
>>> user VBO.
>>> The NV50 driver also doesn't use the push path for indexed draws
>>> which makes confident enough with this fix. Furthermore, this
>>> doesn't introduce any regressions with piglit.
>>> As a side-effect, this also improves performance with The Talos
>>> Principle (+~20% fps) and probably with other games which use indexed
>>> draws. This is because uploading a user VBO is more efficient than
>>> pushing data directly into the pushbuf.
>>> There is still an issue in this game (sometimes walls become green),
>>> but this seems to be totally unrelated to the first issue (disabling
>>> the push path doesn't help here).
>>> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90513
>>> Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
>>> CC: "11.1 11.2" <mesa-stable at lists.freedesktop.org>
>> Gents, this patch can be considered superseded in favour of
>> 154c0a42a23187c61ea0a1307198fae667398eba, correct ?
> Correct.



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