[PATCH xf86-video-ati 0/3] Initial glamor and SI support.

[Alex Deucher]

On Tue, Jul 10, 2012 at 8:06 AM, Rafał Miłecki <zajec5 at gmail.com> wrote:
> 2012/7/10 Michel Dänzer <michel at daenzer.net>:
>> The main purpose of these changes is to allow using this driver on SI hardware
>> and playing with the (still quite limited) Gallium radeonsi driver in an X
>> environment.
>>
>> Longer term, glamor might be interesting for older Radeons as well. Right now,
>> its main drawbacks are missing XVideo support (shouldn't be hard to add to
>> glamor), and occasionally quite annoying diagonal tearing.
>
> Ups, I got lost. So do we drop idea of using xf86-video-modesetting
> for SI? I though we want to use xf86-video-modesetting and some
> Gallium state tracker for 2D acceleration.
>
> What's the difference between handling 2D acceleration in:
> 1) xf86-video-ati
> 2) xf86-video-modesetting + X/Gallium?

xf86-video-modesetting does not provide any acceleration and was just
an interim solution while we evaluated the options for SI 2D.  The
gallium xorg state tracker is a complete ddx on it's own and doesn't
depend on any other ddx.

>
>
> Also one question for below:
>
>> Defaults to shadowfb. 3D acceleration is available with glamor. 2D
>> acceleration is disabled until the radeonsi driver can handle glamor's
>> shaders.
>
> Could you explain what is glamor? I was sure it is supposed to provide
> 2D acceleration using OpenGL. What do you mean by providing 3D
> acceleration with glamor?

It's a 2D acceleration infrastructure that uses OpenGL.  Glamor uses
the 3D driver to to provide 2D acceleration.  You need a proper ddx to
enable 3D acceleration in X to provide the dri2 hooks and the 3D
driver name.  You can either do that with EXA, glamor, or something
similar.

Alex

>
> --
> Rafał
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