From:	davin AT cosc DOT canterbury DOT ac DOT nz (Davin Pearson)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Glitch-free scrolling under Win95?
Date:	18 Aug 1997 02:21:21 GMT
Organization:	University of Canterbury
Lines:	20
Message-ID:	<5t8bj1$c91$1@cantuc.canterbury.ac.nz>
NNTP-Posting-Host:	132.181.12.74
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I have just installed the Allegro libraries and demos and have noticed
that my Win95 box makes some of the screen scrolling demos glitch
about twice every second.

I used to program on the Amiga, where you could write a demo that
scrolled around a huge bitmap with no glitches whatsoever.  Is such a
thing possible on Win95?  If so, how do you do it using Allegro?

I am writing a car game, in which the view point of the cars is a 
birds-eye view, and so the graphics engine is simply a piece of code
to scroll around a super bitmap (in main memory).  The problem is that
glitches are much more noticable when you are scrolling a huge bitmap
as opposed to moving sprites and pixels around the screen like
all those asteroid-clone games.

If someone has written some Win95-glitch-free code under DJGPP, could
they post a pointer to it?

ta, Davin.

- Raw text -