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Assembly 1994 - The 3rd Phase
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ASMROM94.mdf
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3dstars.txt
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1994-11-12
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{************************************************************************}
{* *}
{* STARS by Mark Mackey. Displays a starfield from a moving, *}
{* rotating viewpoint. Somewhat glitchy due to using only *}
{* 16-bit arithmetic (rotations aren't quite orthogonal), *}
{* but works OK as an example. Could also be sped up a bit *}
{* by rewriting the newstar() procedure in assembler and *}
{* fiddling with the update() code, but I couldn't be bothered. *}
{* If anyone wants to convert this to 32-bit arithmetic and *}
{* send me a copy I'd be quite grateful... *}
{* Alternatively, the star positions could be fixed and the *}
{* display positions re-evaluated each display cycle from the *}
{* orientation and position of the viewer, but this would make *}
{* wraparound harder and would probably be slower. *}
{* This code is released as freeware. You are free to use and *}
{* modify it as you see fit, but acknowledgement would be nice, *}
(* {$DEFINE DREAM_ON} as would $$$ {$UNDEF DREAM_ON}. *)
{* *}
{* Please send comments, suggestions, bugs etc to *}
{* mmackey@aqueous.ml.csiro.au. If mail bounces (I'm moving *}
{* soon) resend to mackey@aqueous.ml.csiro.au with 'MARK:' in *}
{* the subject header, and it'll get to me eventually... *}
{* *}
{* Hit 'x','y','z' to toggle rotation about that axis, '<' or '>' *}
{* to change rotation speed for currently selected axes, or *}
{* '+','-' to change speed. ESC exits. *}
{* *}
{* If this program crashes in a huge steaming heap then you've *}
{* probably got a 286. This program won't run on a 286. Sorry. *}
{* You lose :). *}
{* *}
{* (C) 1993 Mark Mackey *}
{************************************************************************}