Overlays

[Substring]

This is how I see things according to what I've understood so far :

• overlays without integer scale is as easy as killing babies with axes : consoles (not handheld) will be stretched to max size (which is screen height * 4/3). Handhelds are natively pixel perfect, so it's the same story almost. Any overlay for non IS game will just fill a pair of side borders
• using overlays on 1280x1024 screens is worthless but for vertical shmup
• I still think overlays are much more worth when integer scale is on
• handheld consoles should be easy for there IS screen resolution
• nothing is set yet on how to manage arcade
• the aim os to make some overlay models for each console, for a few different screens, even if i think 1080p and 720p are the only worth ones
• integer scale is, as i understood, the fact of multiplying both the emulator resolution by a single integer. It has no impact on scaling the video to 4:3
• for arcade, i think we should keep the original rom resolution (or smhumps would be stretched) => Pixel Perfect mode for arcade. One of my next tasks for arcade is to list all mame supported games with their resolution. Haven't checked yet how it is stored on fba

Of course, this is my personnal opinion. I think we put things plain, time to decide ^^

For consoles, based on the link i posted earlier on the libretro forum, this is what i suggest as resolutions :

• SNES : 299x224
• Megadrive : 299x224
• NES : 299x224
• SMS : 256x192
• FDS : 299x224
• NeoGeo : 299x224 (though i wonder, looks like it crops the image)

[ironic]

299/224 = 1.3348
It's the nearest 1.3333 CRT (4/3) aspect ratio.

If our monitors have a square pixel, everything is good.
If the pixels are not square, we must recalculate the resolution.

On my LCD1280x1024 IBM ThinkVision 17 "5/4:
X = 340mm
Y = 271mm

340/1280 = 0.265
271/1024 = 0.264
A pixel is 0.26mm x 0.26mm

We can say that the pixels are square.
Somebody can calculate pixel size on 16/9 monitor?

Various resolutions will be used:
1280x1024, 1280x720, 1920x1080

The basis for the resolution is 4/3 of 299/224.
With a vertical Integer Scale and the largest image:

1280/1024:
299/224 × 4 = 1196x896

1280 * 720:
299/224 x 3 = 897x672

1920/1080:
299/224 × 4 = 1196x896

With this resolution, image quality will be the best, with and Without scanline shader.
And give area for an overlay.

Arcade games resolution and other:
Arcade Infos Games

For arcade games, overlays are very differents. It's impossible to set a resolution.
Each game must have his resolution.

[Substring]

Very nice job ironic.

Concernning lcd monitors square pixels, let it be a dogma : they are square, can't bother for every recalboxer ...

For arcade, as I said earlier, the aim of the topic is to go step by step, and find some rules and scales for overlays. I'd love to offer some masks (png / psd) for people (like @screech) who want to generate overlays

so far we haven't spoken yet of handhelds, but they all have a lcd screen, just need to find their resolutions, and their integer scale values for 1080p and 5:4

@ironic the SMS is the only one with a resolution different from 299x224 : 256/192, which is 4/3. So this perticular overlay should be slightly different than others. We also means quite some consoles, namely vectrex as you've worked quite much on its overlays

As, quite often, most consoles have several resolutions, should we force a 4/3 custom ratio in retroarch or can wa consider afterall that those consoles would anyway render to 299x224 ?

For the pixel aspect ratio of any screen : you can do it much faster. The panel size ratio MUST equal the resolution aspect ratio.
In yur case, you just pray that 340/1280 = 271/1024 => 1280/1024 = 340/271. 5/4 = 1.25, 340/271 = 1.262

Anyway, no need to check monitors, that's a user problem that we can't solve through recalbox as it depends on parameters (the real lcd panel size) that we can't programmatically get.

[ironic]

Arcade Overlays :

Let's try to scale an overlay :
Dragon Ninja (256x240)

This is a pixel perfect 256x240

To see how it really must be, scale it to 4/3 (320x240)

The Bezel is square, how can we scale it to fit 4/3, 5/4 or 16/9 screen ?

I don't know.
Here, the game screen is very very small...

We can find some 16/9 truncated Bezels for 16/9 as :
(This one is 1.32 Ratio)

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The viewport of the bezel is too small. Such a game 320x240 once stretched to 4:3 will be "integer-scaled".
For 1280x1024 : factor 4 => 1280x960
For 1920x1080 : factor 4 => 1280x960, but with bigger borders

This is how I wee things. This example prooves once again that 1280x1024 is not worth for overlays unless you want the viewport to look like a stamp

[paradadf]

https://github.com/libretro/mame2003-libretro/pull/53

There has been some corrections about aspect ratio in mame2003. This last pr reverts some stuff. I suppose it is relevant so I post it here.

[codyv59]

[ironic]

Oh la la, très très jolie Overlay/Bezel, bravo

[Substring]

our friends over at HFS made a nice wiki and if you go to http://wiki.hfsplay.fr/doku.php?id=tutos:install_hfsbox15k#l_installation_des_drivers_runtimes_directxand scroll a little down, you have all resolutions for CRT consoles. The rest of the topic is very interesting to read too, despite being in French

[Substring]

The complete list of MAME 0.78 resolutions / La liste complete des resolutions MAME à mettre en exergue avec https://forum.recalbox.com/topic/3475/recalbox-sur-tv-crt-en-rgb/308

1020x1020
1024x768
1024x772
1024x780
1024x800
1024x808
1024x840
1024x848
1024x912
1040x880
1050x900
1056x864
160x200
208x232
224x224
224x232
224x240
232x224
240x176
240x192
240x216
240x224
240x232
240x240
240x248
240x256
248x208
248x224
248x240
248x256
250x280
254x232
256x184
256x192
256x200
256x208
256x216
256x222
256x224
256x230
256x232
256x234
256x240
256x248
256x256
256x288
256x448
256x480
260x240
264x224
264x232
272x216
272x224
272x232
272x236
272x256
276x240
280x216
280x224
280x240
284x240
288x208
288x216
288x224
288x256
292x230
292x240
296x224
296x240
300x260
304x224
304x232
304x240
304x248
304x256
318x222
320x152
320x200
320x204
320x224
320x232
320x240
320x256
320x416
336x238
336x239
336x240
338x236
338x240
352x240
352x256
360x224
360x240
360x244
368x224
368x232
368x240
368x448
376x224
376x240
376x248
380x224
384x224
384x240
384x254
384x256
384x280
394x240
396x256
400x248
400x254
400x256
404x254
410x256
416x224
420x400
432x224
448x224
448x240
464x224
480x440
480x480
488x384
496x232
496x384
496x480
500x440
512x192
512x224
512x236
512x238
512x240
512x256
512x288
512x352
512x384
512x400
512x448
512x480
520x400
540x400
580x400
580x500
580x570
638x240
640x232
640x240
640x480
672x240
720x768
768x240
832x448
864x224
900x600

[TheRealFox]

Can someone explain ( a little tuto), please, how to save overlays for every rom separately in mame core, in order to initiate automaticaly with the previsously choosen one on the rom load?