pouët.net

TSCHAK information 6 glöps

• general:
• level: user
• personal:
• first name: Thomas
• last name: Cherryhomes

• demo Amiga OCS/ECS Boing by Dale Luck & RJ Mical
• I would like to confirm what previous posts have said:
  
  * yes, it does run on a custom screen. It uses the OS to do the initial drawing and the setting of the color registers (for color cycling, background grid etc.)
  
  * yes, it does alter the bitplane offsets for horizontal motion, going as far as creating 8 copies of the background, each shifted by 1 pixel, so that the bitplanes of the background can appear to be locked into place, while the viewport is shifted.
  
  * the bitplanes are also larger than it appears, vertically, so that the viewports can be shifted for the vertical motion.
  
  Using these techniques, combined with simply pointing Paula at the loaded samples in chip memory, and triggering paula to play them at the appropriate times, you get a demo that uses almost no CPU time, and thus, can multitask very cleanly...it really was quite effective, and made those of us used to seeing tiny 16x16 or 32x32 sprites drop our jaws to the floor. :)
• isokadded on the 2014-05-01 21:15:16
• 128b Atari VCS transmat by Tschak
• It's even more interesting on real hardware, as the slipping vertical sync, sometimes causes intermittent tearing of the video signal. :)
• isokadded on the 2013-06-30 01:22:48