Cache bloom prefilter data #27
Merged
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Let me know if the function to calculate the data is alright where it is.
Also technically storing bloomThreshold as a separate value is redundant now since it's stored inside R3D.env.bloomPrefilter.x for the shader uniform as well, but I think it's more readable and maintainable the way it is. If you'd prefer to not have it there, I can alter it.