Path: utzoo!mnetor!uunet!husc6!cmcl2!nrl-cmf!ames!pasteur!ucbvax!UMDD.BITNET!BBOURBIN
From: BBOURBIN@UMDD.BITNET (Brett S Bourbin)
Newsgroups: comp.sys.amiga.tech
Subject: multiple viewports and color registers
Message-ID: <8804281803.AA28189@jade.berkeley.edu>
Date: 28 Apr 88 17:29:37 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 21

Does anyone know of a "Official" way of setting the screen colors of a
multiple viewport display, on the second viewport?  I have a split display
that has different color palettes and I want to write a VBLANK routine to
control the colors in the bottom port.  I am going to use the VBLANK to
fade in and out the colors.  Now, I thought that I could use the LoadRGB4()
system call during the vblank to change them, but this would not change the
Copper list that MakeVPort() and MrgCop() created to do the split screen.
I don't think I could issue calls to make a new Copper list during the vblank
so I guess my only hope is to go to the hardware directly and create a new
Copper list every time I want to change the colors.

Now, I have tried very hard to use all system routines and have not gone to
the hardware in my game, but I can not see a way to do what I want without
direct hardware access.  Does anyone else see a better way?  Also, does
LoadRGB4() change the custom chip color registers along with updating the
viewports ColorMap structure?

Brett S Bourbin
Instructional Computer Programs, University of Maryland
bbourbin@umdd.BITNET
brett@rover.umd.edu