Subject: Re: [stella] Tetris brainstorming From: Erik Mooney <emooney@xxxxxxxxxxxxxxxxxxxxxxx> Date: Sun, 07 Jan 2001 03:08:41 -0500 |
>I had a chance to play a couple of Tetris clones for the 2600 recently. >They all seem to pretty much just use playfield graphics for the blocks, >except Colin Hughes' Tetris26 which adds grid lines that look great but >seem to introduce some flicker in emulation (didn't try it on a real 2600, >and I'm only assuming it's the gridlines causing the flicker since it's >what's different.) Today while waiting in a Sam's Club checkout line it Inspiration can strike in the strangest places... :) >occurred to me that there's no need for the flicker if you use both players >set to 3 copies each. > >Suppose the playfield is set appropriately, and each player is set to > >00010001 > >So you could set them to three copies each, both colored black, and get this: > > 1 1 2 2 3 3 4 4 5 5 6 6 > >where the 1's are player 1, copy 1, the 2's are player 2 copy 1, the 3's >are player 1 copy 2, etc. This is enough to get a 12 column wide tetris >game going. If that's not wide enough (I'm not a huge Tetris fan so I Official Tetris is 10 columns wide. Many knockoffs make it wider (very few make it narrower), and that takes a lot away from the game because you have a lot more room to put unwanted pieces. (Sorry, just a personal dislike. :) ) And note that you'd actually need 13 lines to enclose 12 columns, so you'd have to use one missile. >don't know offhand) you could add both missiles and get 6 more columns for >a total of 18. As a bonus, you could set all the players' and missiles' >positions at the top of the screen, and just switch them off when you draw Not sure exactly what you mean by "switch them off"...? >the frame containing the game. You could add the horizontal grid lines by >vblanking every 8th scanline, or just changing the playfield color to black. > >Am I missing something or would this accomplish what Colin has done without >introducing any flicker? It does sound like it would work, as long as you don't need the players or missiles for anything else. -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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