Re: [hatari-devel] aspect ratio problems

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On perjantai 09 elokuu 2013, Douglas Little wrote:
> Just to inform....
> 
> "--aspect off" did solve my problem - thanks.

Good.


> IMO setting the aspect ratio based on resolution is probably ok for ST,
> TT etc. where the video modes have known/fixed configurations with only
> a few variations for borders etc. but isn't reliable on the Falcon.
> 
> The Videl allows pixel size and resolution to be programmed independently
> - so while this works most of the time (most programs use the full
> screen area), it can go wrong for programs which deviate from this -
> widescreen effects etc. esp. if the scanning area is moved dynamically
> (for example a fade/wipe which changes the line count would cause Hatari
> to flip ratios several times).

There's ifdeffed out code in videl.c::VIDEL_getMonitorScale() which
tries to do similar thing based on Videl registers, but it was found
out that deducting the scaling factors from screen size is more robust.


> However I have a workaround so I'm ok with that :)

Note that one of the roles of aspect correction is avoiding extra hostscreen
resolution changes.  Without it some Falcon demos weren't viewable on PC,
(some) LCDs just wouldn't keep up with demos resolution changes.


	- Eero