heads up: hw acceleration for crmfb

[Michael Lorenz <macallan%netbsd.org@localhost>]

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Hello,

I just committed code to support hardware acceleration in crmfb. To  
use the drawing engine we
have to run the framebuffer in native, tiled mode which currently  
breaks X but now that I know more
or less how the thing works I think I'll come up with a driver for X  
pretty soon.
There are a few more things I could do to speed things up. Right now  
we always wait for the engine to become completely idle before  
issuing another command, mainly because I haven't
found the register holding the pipeline level yet.
We use the rendering engine for everything except character drawing -  
crime doesn't support colour expansion so we draw them into an off- 
screen buffer and blit them into place, that way
we don't have to teach rasops about tiled framebuffers.

have fun
Michael
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