XCX engine quick/cheap blur AA combined with a sharpen pass.
This aproximates original setting but scales to any res.
Edit sharpen_strength to personal preference
const float sharpen_strength = 0.2; //0 off, 1 full (edge haloing)
note, off = use only blur aa
Add - God ray stencil scaling. Actually does improve quality.. just hard
to notice
Fix - Sky colour banding, increase depth + dithering
Improve - Brightness truncation banding, increase depth + dithering
Improve - AA "fix" edges was still using old logic