Subject: RE: [stella] disassembling River Raid From: Mark De Smet <de-smet@xxxxxxxxxxxxxxx> Date: Mon, 6 Aug 2001 19:30:21 -0500 (CDT) |
> > after disassembling Starmaster, I want to try River Raid now, because I > want to know exactly how the terrain generator works. I'd be interested in reading that ;-) > Oh, yeah!! I'm sure that the kernel code is the trick of the century. it > seems to use very big tables (maybe for smart position and drawing routines, > and the playfield graphics...) As Carol Shaw explained in "Stella at 20 V2"(Thanks Glenn!), it is generated with a Pseudo random number generator(a LFSR). IIRC in the video she debates the size of it, but thinks it is 15 bits, which would put it at 32767(*2 for the straight levels) different screens, without any tables necessary. Please let us know how it turns out! Mark Thomas, if you are unfamiliar with LFSR's, mention it, and I'm sure someone on the list can explain. I would probably help in figuring out the code. - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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