karl%sugar.uu.net@UDEL.EDU (10/04/88)
Received: from CUNYVM by CUNYVM.BITNET (Mailer X2.00) with BSMTP id 2468; Sat, 01 Oct 88 18:42:46 EDT Received: from UDEL.EDU by CUNYVM.CUNY.EDU (IBM VM SMTP R1.1) with TCP; Sat, 01 Oct 88 18:42:28 EDT Received: from Louie.UDEL.EDU by Louie.UDEL.EDU id aa17717; 30 Sep 88 21:09 EDT Received: from USENET by Louie.UDEL.EDU id aa17593; 30 Sep 88 21:00 EDT From: Karl Lehenbauer <karl@sugar.uu.net> Subject: glitching sprites while doing ScrollVPort Message-ID: <2716@sugar.uu.net> Date: 30 Sep 88 22:47:55 GMT Organization: Sugar Land Unix - Houston, TX To: amiga-relay@UDEL.EDU Sender: amiga-relay-request@UDEL.EDU I'm having some problems with a little technology demonstrator I'm cooking up. It is a lunar lander that vertically and horizontally scrolls a 320X200 screen over a 640X400 IFF ILBM using ScrollVPort. The problem is that when the screen is scrolling, the sprites glitch, show as vertical crud for the whole height of the display and such. I was wondering if anybody knows offhand what I should be doing that I'm not. It's possibly just a dumb bug inside the program, though, 'cuz it's kind of hacked, but it's so strongly correlated with the scrolling, I thought there might be something I missed. -- -- "Insert the disk at your own risk." -- Firesign Theater -- uunet!sugar!karl, Unix BBS (713) 438-5018
karl%sugar.uu.net@UDEL.EDU (10/04/88)
Received: from CUNYVM by CUNYVM.BITNET (Mailer X2.00) with BSMTP id 5230; Sun, 02 Oct 88 00:45:02 EDT Received: from UDEL.EDU by CUNYVM.CUNY.EDU (IBM VM SMTP R1.1) with TCP; Sun, 02 Oct 88 00:45:00 EDT Received: from Louie.UDEL.EDU by Louie.udel.EDU id aa03946; 1 Oct 88 23:05 EDT Received: from USENET by Louie.UDEL.EDU id ab03937; 1 Oct 88 23:04 EDT From: Karl Lehenbauer <karl@sugar.uu.net> Subject: Re: glitching sprites while doing ScrollVPort Message-ID: <2724@sugar.uu.net> Date: 2 Oct 88 00:47:41 GMT Organization: Sugar Land Unix - Houston, TX To: amiga-relay@UDEL.EDU Sender: amiga-relay-request@UDEL.EDU [I curse the day I first started using an overscan Workbench] In article <6084@pasteur.Berkeley.EDU>, koster@cory.Berkeley.EDU (Anonymous user) writes: > The symptoms you describe (tall vertical lines, garbage sprites that come > in and out) are exactly the ones I found when someone had his preferences > display position way to the left, and was running a program that used > sprite 5. That was REALLY fun to debug! I just assumed it was my fault, and > just couldn't find the bug. Bingo. I shifted the screen to the right with Preferences and the problem went away. Whew, thanks to sub-24-hour news turnaround, I didn't burn too much time on this honker. -- -- "If it's soft and hard to find, it's wimpy!" -- Wimpy's Software -- uunet!sugar!karl, Unix BBS (713) 438-5018