home *** CD-ROM | disk | FTP | other *** search
- G'day all,
-
- I am currently working on an 8-way hardware scrolling routine,
- and have just come across a minor snag.
- Scrolling to the right is fine (as should to the left when I get
- that going), but scrolling down (and consequently up), is causing
- me difficulties.
-
- The problem seems to be that "block" doesn't blit to the screen
- fast enough. I'm trying to blit 20 blocks across the bottom of the
- screen (just out of view), and across the top of the screen (again
- just out of view. I'm therefore trying to blit 40 blocks at once.
- When the scrolling is going, there is a very very minor jerk,
- (hardly noticeble, but I can see it, and I don't like it!). This
- doesn't occur if I blit only 18 blocks on top and bottom (36 in
- total).
-
- I could just reduce the width of my displayed screen by 32
- pixels, but would like full screen (and even overscan if possible),
- but "block" isn't fast enough.
-
- What I would like to know is this: Is there an even faster
- blitting command than block??
- How have other people got around this problem??
-
- Thanks in advance,
- Dave
-
- -----------------------------------------------------------
- Dave Cole | Please contact me for info
- s933384@yallara.cs.rmit.oz.au | about
- s933384@minyos.xx.rmit.oz.au | The Warhammer
- David_Cole@guru.apana.org.au | Compendium
- -----------------------------------------------------------
-
-