Re: [B2-devel] Rudimentary port to SDL2

[David L. <dl...@po...>]

What about using, or just allowing, a combination of the following, for
high-res monitors?:

1. use aspect-correct scaling, with the displayed size being the same ratio
as the emulated screen's size. If the native screen was a different aspect
ratio, then employ solid-color bars on the appropriate sides.  I.e. use
letter-boxing where appropriate.

2. have an option to only scale up/down in non-fractional amounts.  When
doing so, be sure to disable anti-aliasing (*).  This should, in theory,
allow for non-blurred pixels.

* - nowadays, SDL pretty much always uses either OpenGL or D3D,
behind-the-scenes.

On Sun, Aug 13, 2017 at 1:39 PM, Ricky Zhang <zha...@gm...>
wrote:

> Regarding to the preference part in UI or in ~/.basilisk_ii_prefs, it is a
> piece of cake. I can help you for this.
>
> But I’m not sure we are on the same page regarding to up scaling.
>
> In current implementation i.e SDL v1, I can make BII in full screen mode
> in Mac OS X under 1920x1080 resolution. IMO, stretching always don’t look
> great in full screen mode. I have 21:9 screen. I feel the pain when playing
> low-res vintage game in full screen mode. If it is stretched ,it get
> distorted. If it is not, it is way too small to see.
>
> So I wonder what need to be done to up scale the guest OS properly either
> in windows mode or in full screen mode under hi-res monitor. I’m 30
> something now. I can image that if I grow older and have far sighted issue,
> I will have trouble to see the text or play game even under hi-res monitor.
>
> I believe up-scaling is applying some sort of filter on the original
> frame. It may not need SDL v2 to do the trick though if acceleration is not
> needed.
>
> I’m glad that you start an initiative to port SDL2 to BII. But in order to
> convince the folks to upgrade, we’d better have a killing features.
>
>
> On Aug 13, 2017, at 12:18 PM, David Ludwig <dl...@po...> wrote:
>
> Side note to point #1, regarding aspect ratio: the scaling only works, at
> present, in fullscreen mode.  A means to scale in windowed mode might be
> nice, although, I suspect it could require either a new setting, or a
> modification to the "screen" setting's syntax.
>
> On Sun, Aug 13, 2017 at 12:16 PM, David Ludwig <dl...@po...> wrote:
>
>> The SDL2 port should, in theory, already be scaling the guest OS'
>> resolution up to the host OS', albeit only in fullscreen mode.  What it
>> doesn't do, however, is:
>>
>> 1. maintain aspect ratio.  It'll stretch the guest OS' display to match
>> the host OS'.  SDL2 does have functionality to help with this, though.
>>
>> 2. use anti-aliasing when either of the scaling ratios have fractional
>> components.  This seems like an easy enough add, though.
>>
>> I'll record TODOs/issues for both of these, at my port's repo (at
>> https://github.com/davidludwig/macemu).
>>
>>
>> On Sat, Aug 12, 2017 at 8:25 AM, Ricky Zhang <zha...@gm...>
>> wrote:
>>
>>> Thanks for sharing this! This will be a superb work to renovate BII.
>>>
>>> I don’t mean to hijack your thread. But since you touch SDL2 topic, I
>>> wonder how to make it looks nicer in hi-res monitor. Even in 2K monitor
>>> nowadays, I think the font size and game screen is way too small.
>>>
>>> I know that mini Mac has zoom 2X feature. My educated guess is that the
>>> zoom implement this way — If there is a pixel like [x, y, RGB(r,g,b)], then
>>> zoom 2 X is to draw a 2X2 matrix:
>>>
>>> [x, y, RGB(r,g,b)],     [x+1, y, RGB(r,g,b)]
>>> [x, y+1, RGB(r,g,b)], [x+1, y+1, RGB(r,g,b)]
>>>
>>> I can imagine in some cases it won’t looks good. Thus, we need to smooth
>>> it with anti-aliasing. But this is beyond my expertise.
>>>
>>> If anyone has insight to solve this problem in hi-res, please let me
>>> know.
>>>
>>> thanks,
>>> Ricky
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>>
>>
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