From: "jakub" Newsgroups: comp.os.msdos.djgpp Subject: Allegro demo ship flickers Date: Tue, 21 Jul 1998 21:20:29 +1000 Organization: OzEmail Ltd. Lines: 35 Message-ID: <6p1tdc$vir$1@reader1.reader.news.ozemail.net> NNTP-Posting-Host: slsdn3p22.ozemail.com.au To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Precedence: bulk Hi, When I run the allegro demo game, choosing autodetect 640x480, the ship flickers. I don't know if this is the right word for it. I can see 2 ships on top of each other slightly apart, it seems as if I am seeing the last position of the sprite. This happens when I hold down the left or right arrow keys to move the ship. In page flipping mode I get about 37fps, the 'ghosting' effect is most noticeable here. Double buffering gives me about 41fps, the effect is still there if only slightly better. Dirty rectangles seems to be the best, 220fps, the effect is almost gone, however the ship still is not completely 'smooth' its a touch jerky. I mean jerky in its display. Is this normal? I have a Pentium Pro 200, 32meg ram, Graphic Blaster MA202 (standard 2meg card). I've been trying to write a little space invaders type game using page flipping, I only have a little blue rectangle sprite for the ship, and have managed to make it shoot. However it is very flickery or whatever you want to call it, the bullet is very smooth. But moving the ship, causes this jerky, ghosting effect. -- ------------------------------------------------------------------------