Re: DRM/KMS: vmwgfx driver is now available

[Martin Husemann <martin%duskware.de@localhost>]

On Sat, Jul 22, 2023 at 01:23:39PM +0000, Taylor R Campbell wrote:
> Is there a way we could just use or add a simple hook in genfb or
> rasops for when there's dirty areas to update, so we don't have to
> copy & paste all of that cruft from genfb and drmfb?
> 
> It looks like a painful maintenance burden; maintaining genfb on its
> own is bad enough, and there's a lot of API cleanup warranted in
> genfb, rasops, and wscons.

Don't we have a "shadow" thing that does a quick access framebuffer
in main ram and causes (sometimes delayed) copy back to hardware for
slower graphic cards? See the comments about "shadow framebuffer"
in rasops.h (ri_hwbits vs. ri_bits). It is used e.g. in dev/sbus/cgtwelve.c.

Martin