Subject: Re: [stella] Re: the big sprite From: Eckhard Stolberg <Eckhard_Stolberg@xxxxxxxxxxxxxxxxxxxxx> Date: Mon, 06 Apr 1998 17:11:50 +0200 |
At 17:17 05.04.98 GMT, you wrote: >(There wouldn't be a cycle penalty if some of the pointers point to >different pages, right? As long as we never index across a page boundary?) That's right. We just need to make sure, that all columns for a certain set of animation frames would fit into one 2kb bank, since we can't switch the bank during display. >That's enough to load/store a color (8 cycles), and maybe even check and >turn on or off the ball or do a little bit of playfield. The two-sprite >kernel wouldn't have support for projectiles - perhaps the ball could be >used for that? Colour changes would be possible, but they would be 11 cycles, since we have to change colour for both player graphics. The ball and the playfield thing would be a bit difficult, since conditional branches would mess up the timing. Also, since the players are moveable, the writes to PFx or ENABL would occur at different cycles in the scanline. That means graphics left of the player would be affected one line earlier than graphics right of the player, which would look a bit jerky. Ciao, Eckhard Stolberg -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html Don't post pirate BINs to Stellalist. Be a programmer, not a pirate. Write the best game, win framed autographs of famous Atari alumni!!
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