Ah, I recalled there was a way to ask the window manager to not bother
with uploading to the GPU, but I may be mistaken. I cant find it, so I
may have imagined it :) Disregard my suggestion :P
to On Aug 17, 2009, at 9:58 PM, Christopher Wright wrote:
BTW Why is there readback? The Gif is never on the GPU, you can
tell the window to reside in main memory.
basic data flow:
gif lives on harddrive. gets loaded to memory (this is probably the
slowest operation).
in memory, gets decoded.
gets drawn to a window (even if offscreen, this is probably gpu-
backed). This involves a sysram ->vram transfer (slow, but not a
show stopper).
Then, we need to get window contents in a texture QC can deal with.
We can grab a texture of the window, and call it a day. We could do
this slowly (glReadPixels) to do 2 more sysram->vram transfers, or
we could use a fast copy (glWhateverWeUseToReadInVram, i'm tired and
don't recall off the top of my head). Unless there's a fancy way to
use an actual window's contents as a texture directly -- this is
probably possible (and would avoid readback), but I've not seen it
actually done/know if it's supported.
--
[ christopher wright ]
[email protected]
http://kineme.net/
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