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Jobbo information 111 glöps

• general:
• level: user
• personal:
• first name: Richard
• last name: Jobling
• portals:
• demozoo: profile

• 40k Amiga OCS/ECS Water My Grey Beard by Loonies [web] & Struts
• Quote:

  ... notice that it only stays up for at most a second of activity before the screen goes black ...

  
  
  Wanted to correct that and say it's staying up for 4ish seconds.
• isokadded on the 2023-01-28 04:26:08
• 40k Amiga OCS/ECS Water My Grey Beard by Loonies [web] & Struts
• Quote:

  ... maybe something like an extra move (nop) after two lines in order to waste some extra time (2 cycles) ...

  
  
  So, yes I'd been trying exactly that, one nop every other line. It definitely works, you can display 56 colors on each line.
  
  The problem is that without the loops your code now has to fill all four rows with color data. With all the bitplane and copper activity there just isn't enough bandwidth to do that.
  
  
  Quote:

  Any bean-spiller intentions and willing to give a hint?

  
  
  In fact there isn't enough bandwidth in Blueberry's version to run the rot-zoom and fill just 54x71 colors.
  
  This is where Photon's version has an advantage, he has less bitplane activity because he's using the sprites in place of the right-hand side of the image.
  
  So, how is Blueberry's version running at 50hz? Well, notice that it only stays up for at most a second of activity before the screen goes black again.
  
  From what I can tell Blueberry is pre-filling a huge ring buffer of copper lists, then when the effect runs the code tries to keep filling but eventually the display drains the buffer and that's when it goes black.
  
  So, does that really count? I don't know, I really love it all the same!
  
  I'd love to hear from Blueberry, especially if I've gotten that all wrong.
• isokadded on the 2023-01-27 15:09:33
• 40k Amiga OCS/ECS Water My Grey Beard by Loonies [web] & Struts
• I’m pretty sure I know the main trick being pulled here. Very sneaky! Does it count as a record?
• isokadded on the 2023-01-26 04:49:51
• demo Amiga OCS/ECS Clubisque by SMFX & Lemon. & Insane [web]
• Love those unbelievably fast texture mappers!
• rulezadded on the 2023-01-23 23:30:23
• 40k Amiga OCS/ECS Water My Grey Beard by Loonies [web] & Struts
• Very cool! And the artwork really shows off 12bit color nicely.
  
  The copper list looks like nothing special to me, just 54 color moves racing the beam perfectly and a skip/jump pair to loop.
  
  Unless I'm missing something much trickier I am surprised no one managed this before, well maybe they did and it wasn't noticed?
  
  If I'm missing something and it's actually super hard then sorry.
  
  Could you get 56 colors by removing the loops and using the blitter to duplicate the lines or would that steal too many cycles from the cpu rotator code?
• rulezadded on the 2023-01-23 23:15:30
• demo Amiga OCS/ECS Batman Rises by Batman Group
• Rhino, thank you for all the hard work that went into this demo and for sharing some of the tech details.
  
  I can certainly appreciate the difficulty in pushing your player with frame and line buffering. It's very hard to tailor content to take full advantage of the brief extra capability you've made possible. I'd like to hear more about how the content was made to reach those limits.
  
  I'd also love to hear more explanation about how the other effects work and where they're pushing the limits. I particularly like the skull rotator, it seems like a variation on the skewing approach but I'd love to hear more.
  
  Excellent work!
• rulezadded on the 2022-12-31 18:05:06
• demo Amiga OCS/ECS Rink a Dink: REDUX by Lemon.
• Coming up on 10 years old! Probably should pay some respect.
• rulezadded on the 2022-12-22 06:09:08
• demo Amiga OCS/ECS Eon by The Black Lotus [web]
• Love this and needed to make sure I'd given it a thumbs up!
• rulezadded on the 2022-11-29 04:34:36
• 4k Amiga OCS/ECS Techno Insignia by Nah-Kolor [web]
• Nice amount of content for a 4k.
• rulezadded on the 2022-04-19 18:55:27
• 64k Amiga AGA Antelogium by Software Failure [web]
• Always love some nice vectors!
• rulezadded on the 2022-04-19 18:53:11