[nitrogen]

FWIW the rainbow link gives this console error in Firefox on a Surface Book with Intel graphics:

    Uncaught TypeError: rgHalfFloatLinear is null

I assume that means it doesn't support 16-bit float pixel formats; maybe this is something that could be detected and shown as an error message in the page?

The original HN link works great, though, very cool!

[haxiomic]

Ahh that's a shame, yeah looks like 16-bit float textures aren't supported but 32 bit are. Thanks for the heads up – I should really be checking if either are supported here!