Graphics support

[Michael <macallan1888@gmail.com>]

Hello,

is anyone still interested in graphics support on HP hardware? If so, I
made some progress on Visualize EG, HCRX and Visualize FX.

Full disclosure - I'm a NetBSD developer, I used some docs found on
parisc.docs.kernel.org, this is my attempt at giving back / comparing notes.

Recently I wrote native drivers for Visualize EG, HCRX and Visualize FX
4, they all support framebuffer access, basic acceleration, cursor
sprite, and on the HCRX, 24bit colour. I also wrote an Xorg driver that
supports whatever acceleration I could figure out, which is copy, fill
and hardware cursor, on all of the above, except ROPs on Visualize FX.

EG, HCRX etc. register functions are here:
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/dev/ic/stireg.h
PCI Visualize EG / Graffiti driver:
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/hppa/dev/gftfb.c
HCRX / hyperdrive:
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/hppa/dev/hyperfb.c

Visualize FX stuff, mostly found by disassembling the STI ROM on my FX4,
comparing notes with docs and hints found on parisc.docs.kernel.org,
and a lot of experimentation:
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/dev/ic/summitreg.h
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/hppa/dev/summitfb.c

The Xorg driver lives here:
http://cvsweb.netbsd.org/bsdweb.cgi/xsrc/external/mit/xf86-video-ngle/dist/src/

What I haven't been able to figure out so far:
- how to do ROPs on Visualize FX. I can do colour expansion, STI colour
  change and plain fills and copies
- access off-screen memory on HCRX. All we can mess with is 1280x1024
  in both 24bit and the 8bit overlay. I'm sure the thing has more
  memory than that, but blitter ops wrap at those boundaries and FB
  reads return garbage.
- off-screen memory on Visualize FX. STI reports 2048x2048 but what's
  actually accessible is screen width rounded up to the next multiple
  of 512 by screen height. There is a clipping register which STI sets
  to match the video mode but setting it to 2048x2048 does not allow
  access to anything else, blitter ops wrap like on HCRX. I *know* this
  thing has more memory than that. On the PCI EG we get full 2048x2048
  no matter what mode we're in.
- 24bit colour on the FX. I can switch the FB wndow to 32bit mode but
  that doesn't result in 24bit pixels being displayed.

hope this helps
Michael