https://github.com/vispy/vispy/blob/081a1216e336e8c2c9aa4c61b926ba771bb5479f/vispy/glsl/math/double.glsl#L8 Link is dead. I presume the correct page is this one https://blog.cyclemap.link/2011-06-09-glsl-part2-emu/
vispy/vispy/glsl/math/double.glsl
Line 8 in 081a121
Link is dead. I presume the correct page is this one https://blog.cyclemap.link/2011-06-09-glsl-part2-emu/