On 02/03/2017 07:48 PM, Bas Nieuwenhuizen wrote:
On Fri, Feb 3, 2017, at 19:24, Jason Ekstrand wrote:
On Fri, Feb 3, 2017 at 9:23 AM, Samuel Pitoiset
<samuel.pitoi...@gmail.com <mailto:samuel.pitoi...@gmail.com>> wrote:
This is similar to the MESA_GLSL_VERSION_OVERRIDE envvar (mainly
for developers). But this one has the advantage to be configured
for specific apps which require a context with an explicit version.
For example, when an app requires a 3.2 core context, RadeonSI
will return a 4.5 context but this might fail (eg. ARK games).
Why is returning a 4.5 context a problem? It's supposed to be
more-or-less backwards compatible.
I'm also a bit concerned about making this driconf option be global
across drivers without it being just a maximum. Suppose someone sets
it to 4.3 for some app that doesn't like 4.5. What happens if they
try to run that app on hardware that doesn't support 4.3? Do they get
a 4.3 context that just doesn't work?
As far as I can see[1], when the game detects GL 4.3+, the engine tries
to load a different set of shaders from disk, but the game developers
have not enabled the right flag during building, so the shaders for
GL4.3+ are not actually distributed with the game, which results in a
failure to load the game. From my POV this is entirely the fault of the
game.
I can confirm that these ARK games fail to start with a 4.3+ context.
But from my point of view, I'm not really *sure* it's a game fault
because as you said in the related ticket, the game starts correctly
with AMDGPU-pro because it returns the right context. Maybe we should
just do the same?
That said, the bug contains a report from someone else that it works on
intel with GL4.3+. I never got to test that or look deeper into this, so
it could very well be that I overlooked something during this analysis.
It would be interesting to get a confirmation, but I don't have any
intel hw here.
- Bas
[1]: https://bugs.freedesktop.org/show_bug.cgi?id=95374
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