Dee Sharpe
Sent from my iPhone
Begin forwarded message:
From: Dee Sharpe <[email protected]>
Date: April 6, 2009 8:04:08 AM CDT
To: Michel Dänzer <[email protected]>
Subject: Re: Gallium HW Drivers & DRI/DRM
Our persistent memory objects are called 'areas', but they're
located in main memory, is that an issue? Also, does this mean that
agp access should be initialized in winsys? I'm assuming that the
drivers have their own ways of handling VRAM.
Dee Sharpe
Sent from my iPhone
On Apr 6, 2009, at 12:55 AM, Michel Dänzer <[email protected]> wrot
e:
[ mesa3d-dev is more appropriate I think ]
On Sun, 2009-04-05 at 16:38 -0700, Corbin Simpson wrote:
[email protected] wrote:
So that means that I can get hardware acceleration by writing the
winsys for Syllable, regardless of the fact that we don't use DRI/
DRM?? I guess the main question is, "Do I have to use the DRI/DRM
drivers in order to use the current hardware pipes?"
And the main answer is, "no, DRI/DRM is not required." r300, i915,
and
i965 use a batchbuffer technique, and the nvxx pipes map the ring
buffer
into userspace, but none of them really know or care about how
that's
set up by the winsys.
Your first target should probably be getting softpipe to run.
Softpipe
is, as the name suggests, a pipe that does all of its rendering in
software, and it can run on top of any winsys.
That's not quite true. Every Gallium core driver (what you call 'a
pipe') defines an interface which the winsys module (which is kind
of a
misnomer - it's not just about windowing systems but generally about
backend details - but we haven't come up with a better name yet)
needs
to implement to be able to use it.
It's a design goal of Gallium to make the core driver completely
independent of API frontend or windowing system / OS environment
backend
details, so in order to use Gallium on Syllable you should only
need to
touch the winsys modules, and there should be no requirement to use
DRI/DRM. That said, Gallium does presume relatively advanced memory
management with persistent buffer objects.
--
Earthling Michel Dänzer | http://www.vmware.co
m
Libre software enthusiast | Debian, X and DRI
developer
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