Through-mode smart texture filtering

[hrydgard]

Adds a new option, "Smart 2D texture filtering" to switch to nearest (pixel) filtering mode if we detect "pixel-mapped" graphics in RECT draws.

Helps #18460 (the issue with the idea), though we might want a compat flag to argue that it fixes it.

Things that get fixed when enabled:

• Fixes the problem in Metal Slug Anthology - texture issue at title screen #15757
• Weird color bleeding in dialog boxes in Final Fantasy gets fixed
• Text gets really sharp in Ridge Racer menus, but some filtering glitches remain
  
  

Things I hoped would be fixed but are NOT:

• Outrun text rendering and other glitches (it doesn't use through mode, plus draws with tristrips)
• Metal Slug XX - texture issue at combat school #15755 (it doesn't use through mode, plus draws with tristrips)

Dubious results:

• Soul Calibur character select turns unfiltered, which doesn't really look much better, though subjective

Untested:

• Lines Showing up in specific spots even on the default settings  #15449

Draft because there are some open questions:

• Should this be a setting, or another texture filtering mode along with Auto etc? "Smart?". Combine with Auto max quality? A new setting
• To fix dialog frames in FFI, which are mistakenly filtered causing color fringes, we need to accept 1-dimensional stretching, which isn't true pixel mapping but due to the nature of the situation, it acts like it in this case. (this seems ok, let's keep it)
• Would like to remove the gstate_c global, maybe

Additional fixes since original PR:

• Small 2D through-mode triangle draws now get checked. Helps multiple games, including some things the previous method missed in Ridge Racer menus

Possible future expansion:

• Detect this for multiple through-mode triangles.
• Detect if projection matrix/viewport params together set up something equivalent to through mode. Outrun has a good example of this, same with Wipeout Pure menus. Then we can use similar logic on top of that.

[hrydgard]

Breaks BoF III due to DetectOffsetTexture not working correctly with unscaled coordinates.

[LunaMoo]

Due to "dubious results" and the fact it's never soo black and white with people's preferences, it probably shouldn't replace any of the existing filtering types, but it would be fine either as an option or as a new type of filtering combined with auto max.

Naming might be hard, but it could use tooltip for explanation or just use "smart" as you proposed, and be explained somewhere in the docs.

[hrydgard]

Yeah, probably the best. Just undecided if it should be separate, since it makes sense to combine it both with the old Auto and the newer Auto Max Quality..

[Narugakuruga]

We can add a single tick box ☑️.
If this is an extra feature, it can be chosen when auto and auto max quality is selected.
And the tick box is supposed to hide itself when linear and nearest is selected, because it's "forced texture filter"

[Narugakuruga]

Also if this proves to be useful for some 3D games, then auto max quality will benefit from both mipmap generation and smart filtering.

[hrydgard]

This no longer breaks BOFIII (after #18653 ). Went ahead and added a new setting to play with.

It's quite nice now in Ridge Racer menus, and many other games too, if you prefer a sharper pixel-perfect look over sometimes-ugly bilinear.

We are not yet able to detect this in situations where games don't use through-mode for their UI, unfortunately.

[hrydgard]

I feel this is useful enough already that we can include it in 1.17, though plan to improve it further in 1.18.