From Kevtris:
Here's some example scanline tests from the scanline generator I was working on tonight. I have finished scalers 100% and that is done, so I started on the scanline generators.
http://blog.kevtris.org/blogfiles... ... es/latest/
I ran into a problem which I knew I'd have on 1080p (and PAL modes). That is, each NES scanline requires a non-integer number of scanlines on the HDMI display. Namely at 1080p, each NES scanline needs 4.5 HDMI scanlines.
This means that the height of each subsequent NES scanline alternates 4/5/4/5/4/5 HDMI lines.
To counter this (you can see an example of what this type looks like, see below) I came up with a scan line generator that "free runs" in relation to the NES video, instead of trying to "scanline" each NES line on the HDMI display. The results of this method are in the above /latest/ directory.
There's also a scanline generator that is tied to the actual NES scanlines, but it can look bad (especially on PAL) due to the afore-mentioned problem. Those are here:
http://blog.kevtris.org/blogfiles...
the filename describes how "Deep" the scanline effect is. 0 = no scanlines at all, FF = maximum.