[Mesa-dev] [Mesa-users] Fwd: Issues with removal of classic OSMesa

[Zielinski, Jan]

Hi Andreas,

Just as a clarification - SWR supports OSMesa, but MSAA support is limited.

Jan 

-----Original Message-----
From: mesa-dev <mesa-dev-bounces at lists.freedesktop.org> On Behalf Of Andreas Fänger
Sent: Tuesday, January 5, 2021 8:08 AM
To: mesa-dev at lists.freedesktop.org
Subject: Re: [Mesa-dev] [Mesa-users] Fwd: Issues with removal of classic OSMesa

Hi Brian,

thanks.

>> BTW, when you say "antialiasing" below, what exactly do you mean?

We are using GL_POLYGON_SMOOTH_HINT
This works well for our use-case. However, if MSAA produces better results, then this would be good, too.

In general, quality is really important for us. That's why we need both features, similar to the classic swrast renderer (but with a better
performance)

Andreas

-----Ursprüngliche Nachricht-----
Von: mesa-users <mesa-users-bounces at lists.freedesktop.org> Im Auftrag von Brian Paul
Gesendet: Montag, 4. Januar 2021 20:47
An: mesa-dev at lists.freedesktop.org; mesa-users at lists.freedesktop.org
Betreff: [Mesa-users] Fwd: Issues with removal of classic OSMesa

Hi Andreas,

I'm forwarding your message to the mesa-dev list for better visibility.

BTW, when you say "antialiasing" below, what exactly do you mean?

-Brian


-------- Forwarded Message --------
Subject: 	[Mesa-users] Issues with removal of classic OSMesa
Date: 	Thu, 31 Dec 2020 12:56:04 +0100
From: 	Andreas Fänger <a.faenger at e-sign.com>
To: 	mesa-users at lists.freedesktop.org

Hi,

I've just seen that classic OSMesa has been removed (again) from Mesa3D a few weeks ago with this commit "mesa: Retire classic OSMesa".

We are still actively using classical OSMesa for high quality rendering of still images in a headless environment with no GPU support (server-based rendering on windows and linux)

Unfortunately, none of the alternative software renderers provide all the features that we require, which is antialiasing and anisotropic filtering.
The current state is (correct me if I'm wrong)

* softpipe: anisotropic filtering is supported, no antialiasing

* llvmpipe: no anisotropic filtering, has MSAA

* openswr: no anisotropic filtering, has MSAA, no OSMesa interface (?)

We had hoped that classical OSMesa is only removed when there is a full replacement after the discussions in 2016 when OSMesa was about to be removed for the first time

https://lists.freedesktop.org/archives/mesa-dev/2016-March/109665.html

https://lists.freedesktop.org/archives/mesa-users/2016-March/001132.html

and the commit that reverted the removal

http://cgit.freedesktop.org/mesa/mesa/commit/?id=9601815b4be886f4d92bf74916d
e98f3bdb7275c

Are there any plans to enhance the renderers so that at least one of them is providing both anisotropic filtering and antialiasing?

As far as I know, anisotropic texture filtering is also one of the OpenGL
4.6 requirements.

In 2016 I was told that there are only very few developers involved in llvmpipe and that chances are not high that someone is going to port the softpipe anisotropic filtering implementation as llvmpipe is much more complex. Is there any change in that situation?

If there are no such plans, is there any chance of reverting this commit again so that classical OSMesa is available for windows and linux in mesa
>20?

Regards,

Andreas Fänger


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