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Hello,
On Mar 6, 2008, at 16:40, Alex Deucher wrote:
On Thu, Mar 6, 2008 at 4:26 PM, Michael Lorenz
<macallan@xxxxxxxxxx> wrote:
On Mar 6, 2008, at 15:58, Alex Deucher wrote:
On Thu, Mar 6, 2008 at 2:58 PM, Michael Lorenz
<macallan@xxxxxxxxxx> wrote:
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Hello,
On Mar 6, 2008, at 14:12, Alex Deucher wrote:
On Thu, Mar 6, 2008 at 2:00 PM, Michael Lorenz
EXA has prepare/finish access hooks for CPU access to buffers. I
don't think XAA has anything similar. There's also an wrapable FB
module, although I think it's only available in Xorg.
I'll have a look at that - the main reason I'm using XFree86 is
that
it's already working on NetBSD/sgimips, Xorg needs some more work
but
I'll eventually do it.
Hmm, some drivers access video memory through tiny apertures like
the
VGA range - maybe I can do something like this - let the rest
of the
Xserver render into my DMA buffer and then blit it in place.
Use shadowfb and hook in a custom shadowupdate() function.
Wouldn't that interfere with XAA? If I could catch the framebuffer
writes that bypass XAA that way that would solve my problem.
Thanks!
Yeah, you gotta pick one or the other IIRC. However for most modern
desktops you either have to be entirely SW or entirely HW or
performance sucks. You lose if any sort of fallbacks cause a pixmap
migration to/from vram.
In my case VRAM is RAM, and the CPU is pretty slow - I've had things
running entirely SW and performance sucked. Not the slowest I've ever
seen but nowhere near what the HW can do.
Also, many X applications have trouble with the HW's native pixel
format, cairo for instance just crashes. Using the DMA engine I can
pretend it's using something more common - ABGR - and those
applications just work fine. I think the next thing I'll try is to
pretend that we're accessing VRAM through a small window, there must
be prior art for that somewhere in the source tree.
have fun
Michael
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