From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2004-11-01 02:21:13
Okay I'll bite. :)
http://starbase.globalpc.net/~jbevren/videosys.txt
it's a 4AM invention, but the concepts are there. ;-)
I agree with screen clearing btw. Two things would help tremendously:
First, clearing the screen quickly is a must. I'd consider setting up a
rectangle fill in hardware if possible, or just a memory fill if not.
Second, double buffering would be nice so that data can be drawn offscreen.
We all like this of course.
-David
On Sun, 31 Oct 2004, Steve Judd wrote:
> Hey Hatch,
>
> Want to know one of the more time-consuming operations in 3D graphics?
> Clearing the screen. No matter how fast of a plotting algorithm I have,
> it still takes at least 8*40*25*4=32000 cycles to clear a full screen --
> about two frames. If you had a way to instantly clear out a section of
> memory...
>
> As to organization, vertical organization is preferred for any plotting.
> That's why people use charmaps. That is, if you can simply ldy ycoord
> then algorithms become simpler.
>
> You can add bitplanes if you want, but they'll be useful mostly for static
> graphics (or very small graphic areas). Forget chunky modes. The reason
> is that you just can't push much data around at 1MHz.
>
> The biggest problem you'll run into? Finding someone to program the
> thing! But it sounds like a fun hardware project!
>
> cu,
>
> -Steve
>
>
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>
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