[SDL3] [PS2] Framebuffer resolution + 240p/480p + PAL support

[Fierelier]

I've been wanting to use the lowres 240p mode on PS2 as I like to do software rendering, and the CPU is somewhat weak. These changes allow for that.

Description

This adds the special hints: SDL_HINT_PS2_GS_WIDTH, SDL_HINT_PS2_GS_HEIGHT, SDL_HINT_PS2_GS_PROGRESSIVE, SDL_HINT_PS2_GS_MODE

They allow for the framebuffer width and height to be set, progressive to be turned on/off and to decide which regional format to use for the signal (PAL/NTSC). Furthermore, the region is no longer overridden by default, so the console will use its native region, instead of NTSC.

Existing Issue(s)

ps2dev/ps2sdk-ports#183
#13969

[slouken]

This generally looks good. I made some SDL-style changes, can you check and see if they look good to you?

[Fierelier]

Looks good to me.

[slouken]

Merged, thanks!

In general we are just making changes like this in SDL3. Is there a reason you can't use that for your project and need the SDL2 PR?

[Fierelier]

@slouken
I've yet to explore and implement SDL3 in my abstraction layer, which will likely only happen once I'm completely satisfied with the layer, since I already maintain both SDL1 and SDL2 compatibility.

This isn't a breaking change, unless you expect a PAL PS2 to output an NTSC signal, which it won't even do in OSDSYS (the browser). -- By default, the framebuffer assumes the resolution of the smaller NTSC signal (448px), regardless of region, just as before. It is simply centered on a PAL console. Pre-existing games should work absolutely fine.

[slouken]

Okay, I've cherry-picked the changes for the next SDL2 release.