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

[Brian Paul]

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=9601815b4be886f4d92bf74916de98f3bdb7275c

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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