Re:Understanding the working of X11 from the ground up (2017)
by gmueckl on Sunday September 22, 2019 @03:13PM
(#21043261)
Every time I tested with Mesa and had issues, it turned out that Mesa was out of spec and quite specifically lying about that fact. And this was with absolutely essential features like rendering into floating point textures. So no, Mesa is not an indicator for spec compliance, either.
Re:Understanding the working of X11 from the ground up (2017)
by shmerl on Sunday September 22, 2019 @04:31PM
(#21043736)
I suppose that was a long time ago? Today Mesa is compliant a lot more than Nvidia blob.
See also: https://www.phoronix.com/scan.php?page=news_item&px=OpenGL-T...
Re:Understanding the working of X11 from the ground up (2017)
by gmueckl on Sunday September 22, 2019 @04:43PM
(#21043807)
Well, that was just one example that I found really egregious. I am usually right to distrust Mesa more than the nVidia blob.
Re:Understanding the working of X11 from the ground up (2017)
by shmerl on Sunday September 22, 2019 @04:57PM
(#21043887)
So when was it exactly? I doubt recently. Mesa progressed to the point of full compliance a few years ago. Today, it's trusted a lot more than the blob, due to the later silently swallowing errors frequently and messing around with substituting shaders behind the scenes.
Try testing current Mesa versions. Previous experiences are no longer relevant.
The fact that Nvidia blob fails you less is not a good indicator for you, unless you test with Mesa as well in each case. Mesa is a lot stricter about OpenGL spec compliance. So if you only test on Nvidia, you likely have bugs that you didn't notice.