Garry,
My first name is "PrasannaKumar". I will use my full name to prevent
confusion :).
I want 3D acceleration for running Compiz or GNOME3 or KWin with
composition. Currently windows Displaylink driver compresses and
transfers pixel data where there is a change (only damaged area is
transferred) to reduce the amount of data transfer. It is able to play
HD video without dropping frames. So I think that 3D acceleration and
video playback acceleration is possible. High end games cannot be played
but the normal 3D and video operations should work without any issues.
When displaylink introduces USB 3.0 devices the bandwidth issue will go
away (I remember reading in Wikipedia that displaylink is working on a
USB 3.0 product).
The displaylink framebuffer driver that comes with linux (udlfb) also
compresses and transfers only the damaged region to conserve the USB
bandwidth. Also CPU usage for doing the compression is very less making
it ideal for mobile devices (may be an android mobile).
http://www.youtube.com/watch?v=3-bLOc1qnMM&feature=player_embedded shows
android mobile with displaylink device. When a mobile phone is able to
power a high resolution graphics normal desktops and notebooks can do
provide good quality output.
PrasannaKumar Muralidharan
On 31-05-2011 15:36, Garry Hurley Jr. wrote:
Kumar
I am going to make the assumption that your culture puts the family
name first, so please excuse me for calling you Kumar if that is not
your given name.
As to your question, I think I understand what you are asking for and
I was thinking similar things about displaying over ethernet about
five years ago. The problem is complex due to video refresh rates and
the latency of the connection. You would not get the same performance
on a video game, for example, unless you dropped a few dozen frames
per second, since the USB bus is slower than the PCI bus or even the
ISA bus. If you are talking about 3D acceleration, I presume you want
to game with it. The solution may lie in buffering, but again, your
performance would suffer unless you took the quality down a notch.
From the gamers I know, dropping quality for performance is a very
tricky balance. Each one is different about the quality he or she will
allow to be dropped in a game but when that balance is tipped, they
will complain or switch to a different technology.
I am not saying it is not possible, but I am asking if, knowing this,
you truly feel it is worth the effort to try to implement it.
Sent from my iPhone
On May 30, 2011, at 1:30 PM, PRASANNA KUMAR
<prasanna_tsm_ku...@yahoo.co.in
<mailto:prasanna_tsm_ku...@yahoo.co.in>> wrote:
USB graphics devices from displaylink does not have 3D hardware. To
get 3D effects (compiz, GNOME 3, KWin, OpenGL apps etc) with these
device in Linux the native (primary) GPU can be used to provide
hardware acceleration. All the graphics operation is done using the
native (primary) GPU and the end result is taken and send to the
displaylink device. Can this be achieved? If so is it possible to
implement a generic framework so that any device (USB, thunderbolt or
any new technology) can use this just by implementing device specific
(compression and) data transport? I am not sure this is the correct
mailing list.
Thanks,
Prasanna Kumar
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