[Open-graphics] Sample VGA translation code, for nanocontroller

[Mark]

Timothy Normand Miller wrote:
> On 9/5/07, Dieter <netbsd at sopwith.solgatos.com> wrote:
> AT 1024x768, we could do an integer 1.5 scaling.  Heck, we could even
> do a smooth scaling where a 2x2 set of pixels from the font are scaled
> in the nanocontroller to 3x3.  That would bring us up to 960x600,
> which wouldn't look too bad centered.
> 
> For 1280x1024, a simple 2x scaling to 1280x800 would look just fine.
> 
> For 1600x1200, I would suggest a 2x scaling.  2.5 would look a little
> better but the computation cost would be too high if we did it
> smoothly.  We'd have to see how it looked if we did an integer
> scaling, where alternate columns/rows are scaled 2x and 3x.  We might
> scale vertically by 3x or 2.5x.  I'm trying to avoid using the GPU
> here, in part because it would be best if we had VGA done BEFORE the
> GPU was finished.
> 
> For 1920x1200, it's a simple 3x scaling to 1920x1200.  For 1920x1080,
> we'd have to do 3x horizontally and 2x or 2.5x vertically.
> 
I sort of assumed (perhaps naively) that this kind of scaling was taken 
care of by the monitor.  I mean, isn't it just receiving a stream of 
pixel data along with Hsync & Vsync that correspond to 720x400x60Hz (or 
whatever)?