[comp.graphics] sun graphics help

landru@stan.com (Mike Rosenlof) (09/13/88)

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!