The ShadeBob Demo Effect V1.1
                           3rd  January 1998
                James Rutherford (Mr.Frosty / Hex Heroes)

                http://www.netyaroze-europe.com/~mrfrosty
                       j.t.rutherford@sms.ed.ac.uk


              [Please ensure you read the cautionary note]


   A pretty GsSPRITE routine reminiscent of the shadebob effects
commonly found on the Amiga demo scene. This sort of thing is actually
pretty simple to do with Yaroze because the transparency effects need no
extra coding. 450 transparent sprites follow a complex sin-wave track
across the screen (I could possibly squeeze a few more out, but I'm
erring on the side of 1-frame caution).

   Standard and analogue pads are supported.

------------------------------------------------------------------------

Standard Pad and Analogue Pad shared controls:

   Triangle Button - Transparency rate 0               // 0.5*B + 0.5*F
   Square Button   - Transparency rate (1<<28)         // 1.0*B + 1.0*F
   Circle Button   - Transparency rate (1<<29)         // 1.0*B - 1.0*F
   Cross Button    - Transparency rate (1<<28)+(1<<29) // 1.0*B + 0.25*F

      [for explanation of semi-transpareny rates see the section
         about GsSPRITEs in the Yaroze Library reference manual]

   Shoulder right 1 - Increase sprite spacing
   Shoulder right 2 - Decrease sprite spacing

   Start  - Quit
   Select - Freeze screen

Standard Pad Only:

   Direction up    - Increase screen red
   Direction down  - Decrease screen red
   Direction right - Increase screen green
   Direction left  - Decrease screen green
   Shoulder left 1 - Increase screen blue
   Shoulder left 2 - Decrease screen blue

Analogue Pad Only:

   Left stick right  - Increase screen red
   Left stick left   - Decrease screen red
   Left stick up     - Increase screen green
   Left stick down   - Decrease screen green
   Right stick right - Increase screen blue
   Right stick left  - Decrease screen blue

------------------------------------------------------------------------

   CAUTION: If you think you are susceptible to epileptic seizures then
   take it easy with the analogue sticks and the transparency flipping.


   To run, load djsetup and type 'siocons auto'.


   Things to try:

   *  Find loopy patterns.

   *  Hold select to freeze the screen and use R1 and R2 to make the
         sprite snakes stretch.

   *  Find nice colour / transparency rate combinations.

   *  Turn off the lights, bung a CD on loud and use like one of Yak's
         light-synths.

   *  Learn about semitransparency?

   *  Use it as a screensaver.

   *  Set the transparency rate to something freaky and twiddle the
         analogue sticks for all you're worth!

   *  Set it running in the background at a party.



   Possible future implementations:

   *  An automatic mode (music controlled??)


   Whatever, have fun with it, post me a comment and visit the mrfrosty
      homepage on the SCEE server once in a while!

                                    James Rutherford (mrfrosty).