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It turns out, unless I'm mistaken, that in a 24-bit framebuffer setup, narrower bit depths (4, 8, 12) are duplicated internally when in double-buffered mode. The actual source buffer is specified by a bit in one of the drawing mode registers, described as "double-buffer source".
Meanwhile, destination buffer is implied by the write mask register. The fast-fill and indexed-color registers only specify data for one lane, with the data being duplicated.
That is to say, a 12bpp index of 7FB would be treated as 7FB7FB internally, with a write mask of FFF000 or 000FFF restricting the write to one buffer or the other. However, a mask of FFFFFF permits writing to both buffers at the same time!
It's such an obvious bit of functionality in retrospect, yet only Alias/Wavefront PowerAnimator really beats on this functionality in order to draw its menu bars.
Without the duplication of lower-bit-depth colors or color indices, the end result is that the menu bar flashes wildly during camera movement, because it's swapping buffers but the menu has only been written to one of the two buffers.
There are still some things to work out, like why the X/Y/Z arrows are miscolored, but it's already so much better than it was.
Having said all that, I'm waffling on whether to commit and push what I've got so far, because I haven't yet thrown the full battery of SGI demos at my changes, and that will literally take hours.
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