Weight glow samples to reduce fireflies #54409
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Fixes: #52066
This is a rather simple idea. Tonemap the raw image data before blurring to reduce the impact of fireflies, then reverse the tonemap to restore the range. Described by Brian Karis here: https://graphicrants.blogspot.com/2013/12/tone-mapping.html discovered while looking at some ideas presented here: http://www.iryoku.com/next-generation-post-processing-in-call-of-duty-advanced-warfare
The same basic idea could be backported to 3.x, but in 3.x it won't be as efficient or elegant because it will have to be applied to every sample as it is sampled.