\> Are there any mechanisms in place where I can do what I can do with DirectX
> under windows? There, my app can do an accelerated blit to off-screen
> memory that is on the display adapter (accelerated over AGP if
> appropriate), and then blit from offscreen to a mapped region onscreen.
Not really, actually, now that I am thinking about it. You will have to do a
memcpy to that shared memory in xvideo.
Wups, that's the answer to the other question I just dashed off :-).
There just aren't any methods under X that get that close to the hardware.
Not even close to as powerful as the newer directX's (versions seven and
eight), especially not for graphics. That API is designed to let you REALLY
get close to the hardware (for quite a few things, like texture memory and a
few other things).
It's unfortunate that we don't get this level of access in X. I realize that that's not what X was designed for, but on the desktop it's what we need (or what I think we need; I'd be more than happy to be proven wrong)
I don't know enough about your app to know if you could, but what resolution,
colorspace, etc are you working in? And how many fps are you getting (40+
streams? that sounds HUGE).
On AGP adapters I can display 25ish fps on a fairly large number of streams (enough 352x288 windows to tile a couple 1024x768 heads). The app in question is vic with the AccessGrid mods for DirectX rendering (www.accessgrid.org is the AG project).
--bob
