> But that technique looks an awful lot like the 2018 GPU renderer from KiCad ;) And lastly, that glyph atlas for font rendering is only 1 channel? KiCad uses a technique using RGB for gradients so that the rendered glyphs can be anti-aliased without accidentally rounding sharp corners.

Is this stuff written down somewhere other than the code?

I use KiCad all the time and certainly never noticed this.