drop multiscreen support

[barbeque-squared]

In its current state, USDX has multiscreen support. Well, what that really means is:

• you can choose either 1 or 2 screens (it's not smart enough to do 6 players across 3 screens, for example)

if 2 screens are chosen:

• it only really does anything when playing with 4 or 6 players. 1, 2 and 3 players just duplicate the screen, and 8 and 12 were never really implemented in the first place.
• there's Z-depth issues on the second screen, at least in the M menu from the song selection screen.

I've only ever seen 2 screens used in this scenario at GalaCon. And people would still get confused where they were supposed to look.

Considering it's really only for 4 or 6 players and this massively overcomplicates any code that has to do with drawing anything, I propose dropping it altogether. I'm not saying that it'll never return, but I am saying that I believe that this is a feature for the <1%. Moreover, 6 players looks really good on a single 1080p screen, if that screen was actually rendered at 1080p and not 800x600 (which is one of the things I've been proof-of-concepting in locally-built versions for a few years now, but not committing because of the multiscreen code)

If you are a user that relies on multiscreen support extensively (and cannot have that usecase covered by much higher quality rendering of six players on a single screen) please make a comment about what exactly you use it for.

[GrueneNeun]

I use the 2 screen option for 6 players and have my whole setup built around it. It's really nice to have big UI elements on two different screens or projectors so you don't have to look that long for where exactly your line is. Using it at bigger events also makes it look more professional. Such a change would really stop me from updating.

[barbeque-squared]

Welp, guess I'm gonna have to do alllll of it the hard way then. I'll keep multiscreen as-is working then, but my overall priorities are at native resolution rendering, a truly variable number of players (still max 6 for the time being), and improvements to the theming system.

[basisbit]

+1 on keeping two-screen-support. It is rather common that events use two projectors for 2 players of karaoke.