Confused at OpenGL version in -current

dive · 08-24-2014, 02:36 PM

I've just been informed that 'glxinfo | grep OpenGL' provides the following info for -current:

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) 945G
OpenGL version string: 2.1 Mesa 10.2.4
OpenGL shading language version string: 1.20

So it appears to be version 2.1. But, in 14.1 we have:

OpenGL core profile version string: 3.1 (Core Profile) Mesa 9.1.7
OpenGL core profile shading language version string: 1.40
OpenGL core profile context flags: (none)
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 9.1.7

So why do we appear to be downgrading? Or what is happening?

I have a precompiled binary of UT4 which is built against OpenGL 3.2.

ReaperX7 · 08-24-2014, 02:47 PM

Mesa 10.2.5 and 10.2.6 have been released since then and has some bug fixes. You could always download the source and use the SlackBuild scripts to rebuild MesaLib.

dive · 08-24-2014, 02:49 PM

Yeah but it's the OpenGL version that I'm interesting in, and why it appears to go down instead of up.

ReaperX7 · 08-24-2014, 03:33 PM

Could be a bug from the specific version.

Are you running driconf by chance?

dive · 08-24-2014, 03:37 PM

I used to have driconf, but don't know if the person (hitest) who gave me the -current version is.

ReaperX7 · 08-24-2014, 03:39 PM

I would rebuild MesaLib then. It's probably just a bug.

dive · 08-24-2014, 06:50 PM

It would seem that it depends on which xorg driver module is loaded.

If anyone has an intel GPU and can run 'glxinfo | grep OpenGL' it would be hugely appreciated.

ReaperX7 · 08-24-2014, 06:58 PM

Which version of xf86-video-intel do you have installed?

dive · 08-24-2014, 07:01 PM

ReaperX7, it's not about what I have on 14.1. I want info on what is in -current.

Hitest apparently has an i915 same as me so that makes his glxinfo even more confusing.

ReaperX7 · 08-24-2014, 07:21 PM

-Current uses version 2.99.914 of xf86-video-intel and mesa-10.2.4... so it should be up to date. Otherwise, it's a bug with Mesa displaying the incorrect versioning numbers.

mlangdn · 08-25-2014, 03:46 AM

From the -Current Changelog:

Code:

Wed Jul 16 05:31:30 UTC 2014
x/xf86-video-intel-2.99.912-x86_64-1.txz: Upgraded.
       Looks like the stable driver won't compile with the new xorg-server, so
       we'll try this one.

Maybe this is the reason? I may be off base here and no help at all to your question, especially since I use Nvidia.

ppr:kut · 08-25-2014, 01:02 PM

I hat a look at the git history of mesa and this is what happened. In Mesa 9.1, the intel dri code for i915 and i965 had a shared source tree under src/mesa/drivers/dri/intel. The OpenGL version is defined in that shared part. In Mesa 10.2 this is now no longer shared. i965 still support OpenGL >= 3.0, but i915 tops out at OpenGL 2.1. So either this was a false value to begin with (ie. i915 doesn't support anything higher than OpenGL 2.1) or this is an upstream bug.

dive · 08-25-2014, 01:55 PM

Thanks ppr:kut. That explains the odd results.

Nille_kungen · 08-28-2014, 06:50 AM

I had a similar problem with AMD radeon hardware but the latest mesa update to 10.2.6 made it look as it should and also added OpenGL ES, maybe it also made changes for intel hardware.
I had some OpenGL problems with wine and so on but the latest update seems to have sort them all out.

Before update

Code:

$ glxinfo |grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD ARUBA
OpenGL version string: 2.1 Mesa 10.2.4
OpenGL shading language version string: 1.30
OpenGL extensions:

After update

Code:

$ glxinfo|grep  OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD ARUBA
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.2.6
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 10.2.6
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 10.2.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.0
OpenGL ES profile extensions:

ppr:kut · 08-28-2014, 07:15 AM

The latest mesa update enables support for floating point textures for all drivers. Before only the intel driver had it enabled because it ignores the ./configure parameter.
Floating point textures are a requirement for OpenGL 3.0, so that's why some drivers might show support for a newer version now.
This should indeed also be the case for the i915 driver