Subject: [stella] Weird horizontal positioning?|
From: emooney@xxxxxxxxxxxxxxxx (Erik Mooney)
Date: Sat, 12 Apr 1997 06:00:57 GMT
For whatever reason, it seems that player graphics display one pixel further right than missiles and balls when identical code for positioning and identical HMOVE values is used for both. After RESPx, there's a five-pixel delay before the player serial graphics begin, but a four-pixel delay for missiles and the ball. This seems to be reproducible both on PC Atari and the Supercharger, and happens both with the Air-Sea Battle fine-coarse convert routine and a standard subtract-15 convert. Anyone else notice this? (For that matter, has anyone else written anything using missiles and balls, or is everyone just working on sprites?) Also, I discovered a flaw in PC Atari's emulation.. if missile 0 is one-copy single-width, hitting RESMP0 resets the missile's horizontal position to line up with the fourth bit of the player.. on the real Stella under the same conditions, the missile's horizontal position becomes even with the _fifth_ pixel of the player. Both the fourth and fifth pixels can be considered the "center" of the 8-bit wide player, so this inconsistency does kinda make sense =) -- Archives available at http://www.biglist.com/lists/stella/archives/ E-mail UNSUBSCRIBE in the body to stella-request@xxxxxxxxxxx to be removed.