[Coco] hardware scrolling

[Simon Jonassen]

Luis....

It doesn't have to be cpu intensive.....

If you just flip 2 pages with different colours and different offsets via a
vertical sync then there is hardly any overhead involved.....

But the flicker is a pig !

/Simon :-)
 

-----Oprindelig meddelelse-----
Fra: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] På
vegne af Luis Antoniosi (CoCoDemus)
Sendt: 28. oktober 2013 14:42
Til: CoCoList for Color Computer Enthusiasts
Emne: Re: [Coco] hardware scrolling

But this is too cpu intensive too and a nightmare to render sprites over it.

I think DragonFire is a masterpiece on that subject right ?


On Mon, Oct 28, 2013 at 6:16 AM, Simon Jonassen <simon at roust-it.dk> wrote:

> Nick...
>
> I have been trying to combine colours by page flipping aswell, but the 
> results are less than impressive....
>
> Quite alot of inherent flicker going on.....
>
> I'm trying to "re enable" the semigraphics feature that should have 
> been possible if they wired the vdg another way....
>
> The said feature is 2 different colours in 1 cell as it stands you can 
> have
> say: (yellow/black or Black/yellow or black/black Yellow/yellow) - 
> what would have been nice was the ability to have say yellow/green
etc......
>
> You can "simulate" this effect to a degree by chosing adjacent cells 
> in 2 locations but it's uses are limited...
>
> /Simon :-)
>
>
> -----Oprindelig meddelelse-----
> Fra: coco-bounces at maltedmedia.com 
> [mailto:coco-bounces at maltedmedia.com] På vegne af Nick Marentes
> Sendt: 28. oktober 2013 10:52
> Til: CoCoList
> Emne: [Coco] hardware scrolling
>
>
>  > Yes i have dabbled a little... You can scroll the screen in the
"broken"
> semi graphics mode.... The one where you can mix hires (only 7 bits) 
> and text/SG blocks !!
>
> Now that would be interesting to see! I wonder if a semigraphics 
> scroll is smooth enough?
>
> An 8 color mode with a black border. Semigraphics gives a completely 
> new look to the old green/buff screen modes of the VDG.
>
> 8 colors flickered between 2 pages to mix the colors gives a 
> theoretical
> 64 colors (theoretical).
>
> The first 64 color hardware scrolling tech demo for the CoCo 1/2.
>
> That'll have me changing my pants!   :)
>
> Nick
>
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