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Haze
Reged: 09/23/03
Posts: 4494
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Re: MAME weird pixel stretching on SNES games
01/09/18 12:30 AM


> Most SNES games run on a internal res of 256x224, but because some games run on
> hi-res mode 512x448 I am always stuck on an uneven stretched res of 512x224 which
> make all filters to scale the image very badly, compared to other emulators like
> Snes9X, Bsnes, etc...
>
> So my question is, how can I force the snes driver to display on a internal and more
> standard res of 256x224, it doesn't matter if a few games get broken in the process,
> or is there another way to have the game properly scaled...
>
> By the way I tried already GroovyMAME stretch option, clean, unclean, unholy
> options... nothing worked so far...
>
> As a last attempt I took a look at the snes.c driver on the source and the ppu.c too
> if I can tweak some lines and after compiling it I didn't get any good results
> either...
>
> I appreciate any help, thanks!!!!!1

you can't.

this is a problem with shaders that assume things about pixels.

in reality a system doesn't have a fixed horizontal resolution, some even mix 'resolutions' between layers because different chips can output at different rates. (typical examples, Galaxian starfield and the PC-FX VDPs)

MAME drivers have to use a resolution that is the lowest multiple of all the possible selections (which is possible as they're all driven by the same clock) in order for things like mid-screen raster effects to work.

if you don't do that then you'd always have a frame delay between a game trying to use a mid-screen effect and MAME changing resolution to that, which wouldn't be correct.

proper shaders, like the CRT ones care less about pixels, much as the TV wouldn't care about pixels.







Entire thread
Subject Posted by Posted on
* MAME weird pixel stretching on SNES games Marcelo_20XX 01/09/18 12:19 AM
. * Re: MAME weird pixel stretching on SNES games TafoidAdministrator  01/09/18 10:05 PM
. * Re: MAME weird pixel stretching on SNES games Marcelo_20XX  01/09/18 10:35 PM
. * Re: MAME weird pixel stretching on SNES games Haze  01/09/18 12:30 AM
. * Re: MAME weird pixel stretching on SNES games anikom15  01/09/18 12:48 AM
. * Re: MAME weird pixel stretching on SNES games Haze  01/09/18 01:19 AM
. * Re: MAME weird pixel stretching on SNES games John Doe  01/09/18 03:44 PM
. * Re: MAME weird pixel stretching on SNES games Haze  01/09/18 05:48 PM
. * Re: MAME weird pixel stretching on SNES games John Doe  01/09/18 09:03 PM
. * Re: MAME weird pixel stretching on SNES games Haze  01/09/18 09:12 PM
. * Re: MAME weird pixel stretching on SNES games anikom15  01/09/18 01:58 AM
. * Re: MAME weird pixel stretching on SNES games Marcelo_20XX  01/09/18 01:38 AM
. * Re: MAME weird pixel stretching on SNES games Haze  01/09/18 02:02 AM
. * Re: MAME weird pixel stretching on SNES games Marcelo_20XX  01/09/18 02:40 AM
. * Re: MAME weird pixel stretching on SNES games Haze  01/09/18 02:59 AM
. * Re: MAME weird pixel stretching on SNES games Marcelo_20XX  01/09/18 03:06 AM
. * Re: MAME weird pixel stretching on SNES games anikom15  01/09/18 03:13 AM
. * Re: MAME weird pixel stretching on SNES games Marcelo_20XX  01/09/18 03:21 AM
. * Re: MAME weird pixel stretching on SNES games Haze  01/09/18 03:26 AM
. * Re: MAME weird pixel stretching on SNES games Dullaron  01/09/18 01:11 PM
. * Re: MAME weird pixel stretching on SNES games Marcelo_20XX  01/09/18 06:33 PM
. * Re: MAME weird pixel stretching on SNES games anikom15  01/09/18 04:35 AM
. * Re: MAME weird pixel stretching on SNES games John Doe  01/09/18 03:29 PM
. * Re: MAME weird pixel stretching on SNES games Haze  01/09/18 04:53 AM

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