| From: | Bart King |
| Date: | 6 Jul 2000 at 18:33:24 |
| Subject: | Re: Gfx cards + AGA |
"Paul Hill" <paul@lagernet.clara.co.uk> wrote:
> There's a 6 year old AGA guide on Aminet.
News to me. If it were officially written by Commodore, it would have been
available in hard copy.
> AGA has very powerfull support for scrolling. You can scroll the screen in
> *less than* 1 pixel increments (35ns or 1 shres pixel). Even High-res
> screens are as fast. And because of the copper (ever seen one of these on
> a gfx card?) you can scroll different areas at different speeds with ease.
I guess this is in an assembler only environment with the operating system
removed. I do not program assembler insofar to program custom chips,
therefore I based what I said on using C system calls and the operating
system - I have never hacked anything, probably because I don't have
relevant documentation.
But then, I haven't touched AGA for a couple of years and probably never
will :)
> No it doesn't. You can pan the video 'window' anywhere through the 2Mb
> of chip ram by changing a couple of registers. Admittingly you need to
> draw the new data at the edges but that's only a small amount.
OK, agreed. But, I meant moving the actual data and not the display. While
this is fine for scrolling the whole display, I tend to scroll portions of
the display, with things like ScrollRaster() etc..
Yes, you can use View's, which is what I think you're suggesting. But
View's can't be with an Intuition windowed environment without making it
disappear.
> Several platforms support planular gfx. Even VGA.
Going by experience, all images I've dealt with on Windows (yes, I haven't
hacked DOS either :) were all chunky. But I guess what DirectX says should
be taken with a pinch of dynamite - who knows what the graphics card
drivers do.
> What have you been smoking? (and can I have some :-)
Strictly non-smoker, thanks.
> >beam sweep, you'll get the effect of a blurred scrolling, which can look
> >cool or shit depending on how you look at it.
>
> It's an old problem. But when have you ever seen it in any Amiga game?
No, because they don't use the OS and/or they scroll the display and not
the image.
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