| From: | James L Boyd |
| Date: | 13 Aug 99 at 18:31:07 |
| Subject: | A CyberGraphX BUG question. (fwd) |
Hi all,
I received this from someone and thought I'd post it for anyone
who isn't on whatever database I signed up to (and have forgotten
about ;)
Maybe someone else can help the guy?
*** Begin of forwarded message ***
Date: 13-Aug-99 19:25:44
From: Emanuele Cesaroni <emacesa@tin.it>
Subject: A CyberGraphX BUG question.
--- Forwarded message follows ---
Hello member of the Amiga Programmers Database.
I am Emanuele an Italian coder and i am writing you to do you gently a
question.
>From about two years i am developing a game, a PuzzleBobble clone, named
PuzzleBOBS, a AmigaOS friendly game which is able to exploit graphic boards
and
other Amiga expansions.
For this reason supports CyberGraphX and Picasso96, but while with Picasso96
and custom Amiga screens all is ok, with CyberGraphX i get a very big
problem.
I examined this problem and now i know that it is due to the replacement
done
by the Cgx team of a system graphic function BltMaskBitMapRastPort() that do
not allow to do blits with inverted masks,a blit allowed by the
standard amiga bitmaps and Picasso96 bitmaps.
This blit has as minterm $b8 [ (NOTB and A) or (B and C)] but has the same
effect of the $e2 minterm [(B and A) or (NOT B and C)] (in theory should
do the inverted action).
I tryed to do all the 256 combinations in a Cgx screen using the
BltMaskBitMapRastPort() function and i saw that i get only two types of
blits.
One is the right blit trought a mask ($ca,$e2) and the rimanent 128 blits
look like
the dest=src minterm blit.
I ask you gently if you know this problem, and if you do if you can say me
why Cgx do not allows this type of blit.
If you are not able to help me, gently i ask you if is possible to find
somebody with whom i can speak directly about this trouble.
Thank you very much for your attention and availability, and excuse
me for my (very little) english.
Bye.
Emanuele Cesaroni.
emacesa@tin.it
*** End of forwarded message ***
See ya,
>From the moment I picked your book up until I laid it down I
was convulsed with laughter. Some day I intend reading it.
-- Groucho Marx
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