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From: landru@stan.com (Mike Rosenlof)
Newsgroups: comp.windows.x,comp.graphics
Subject: sun graphics help
Keywords: CG3
Message-ID: <232@stan.com>
Date: 13 Sep 88 16:52:01 GMT
Reply-To: stan!landru@boulder.edu
Organization: Solbourne Computer Inc., Longmont, Co.
Lines: 16



Hello, world.

I'm writing a driver for the Sun CG3, and don't really want to go through
pixrect.  Can somebody give me a few pointers on this graphics device?

I think I understand everything pretty well including the function of the
ROP processors, but in the file '/usr/include/pixrect/cg2reg.h', I am a
little confused over the 'ropcontrol' in the frame buffer descriptor.
It's declared as a union of the 'normal register access' rop control
registers and offset by 2048 bytes, a 'for pixmode src reg prime byte
xfer loads alternate src register'.  Any insignt to the workings of this
alternate would be most helpful.

thanks!