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Unfolding by Agenda
screenshot added by ilmenit on 2021-03-15 10:42:47
platform :
type :
release date : march 2021
release party : Lovebyte 2021
compo : combined 64b
ranked : 4th
  • 9
  • 1
  • 0
popularity : 43%
  • 0.90
alltime top: #27338
added on the 2021-03-15 10:42:47 by ilmenit ilmenit

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rulez added on the 2021-03-15 10:46:35 by MKM MKM
This intro is variation of "plasma effect". There is a "sine generator" - no sine instruction on 6502 (nor easily accessible in Atari OS) so had to be code-generated. The generated sine is iteratively modified by OS timer (xor) for having different patterns. In the same loop character set and colors are set.
Transition between effects is done by having proper state of registers on entrance to sine generator. Sound is an output of OS timer modified by register state in the screen drawing procedure.
For final optimization it uses code snippet I found in the OS for 16bit decrement, very useful for full-screen effect. Source code included in the download archive.
added on the 2021-03-15 13:21:59 by ilmenit ilmenit
rulez added on the 2021-03-15 15:02:48 by SuN SuN
I like idea
rulez added on the 2021-03-15 15:07:22 by frog frog
That has quite some style for 64B, nice.
rulez added on the 2021-03-15 19:02:07 by Ped Ped
rulez added on the 2021-03-15 22:46:29 by Blast! Blast!
rulez added on the 2021-03-16 10:59:14 by HellMood HellMood
cool idea with sine generator. Also, sexy looking
rulez added on the 2021-03-16 11:10:24 by g0blinish g0blinish
rulez added on the 2023-02-02 21:58:34 by ferris ferris
rulez added on the 2023-02-03 08:46:17 by tjahzi(aka Jimi) tjahzi(aka Jimi)

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