{************************************************************************}
{*                                                                      *}
{*     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        *}
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