Re: [hatari-devel] New SYNC release - new comment on emulation :)

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 05/07/2020 à 18:46, Troed Sångberg a écrit :
> I'm not in favor of too many settings - but this might be a case where both emulating all these lines is correct, and at the same time by default not showing them. Else every single Hatari window will have an additional 18 lines at the top not doing anything, and which practically no ST system ever displayed.
>
> Does the windowed SDL approach preclude dynamically changing window size? My thinking is that, by default, if there's _no_ change to color 0 during those 18 lines, don't show them.

Hi

as you say, this might be tricky to decide this automatically. For 
example, your program change color 0 during these lines, so one could 
try to switch automatically to a larger top border to show them (SDL 
allows to change screen size on the fly, it happens already in falcon 
mode where some resolutions are sometimes "very different" in the same 
demo).

But on the other end, we have also the case of some depackers that write 
to ff8240 while depacking, thus potentialy writing to color 0 during 
those top lines just after vblank is off. Triggering a larger top border 
in that case could give strange result on screen (like top border going 
larger,then smaller, then larger and so on).

Another possibility I had in mind would be to have some kind of settings 
like the knobs on analog CRT monitor to define top/bottom visible line 
and left/right visible part too. For example, display screen from HBL 15 
to 298 and from horizontal cycles 4 to 480 (mixing the result with the 
state of VBLANK/HBLANK).

This could be combined with automatically displaying a few more top 
lines in SDL windowd if the 60/50 hz switch used to end VBLANK earlier 
is detected for 5 consecutive VBL for example.

Nicolas