Without Post Processing fog in nebula is broken since #1846.

[tomimaki]

As is visible in topic below, objects far away from player are not covered by fog when post_process is off. https://www.hard-light.net/forums/index.php?topic=96182.msg1891537#msg1891537 Before #1846 After #1846 Checked on Nvidia 1050 (441.66 drivers) and Intel (drivers from 2019-11-06)

[Baezon]

For posterity, I'll mention that this is caused by the srgb_to_linear conversion here https://github.com/scp-fs2open/fs2open.github.com/blob/master/code/def_files/data/effects/fog-f.sdr#L35. Without post processing, and that conversion removed it fogs to the correct color again. I've bought up only conditionally doing this step, but the other graphics coders seemed to prefer deprecating -no_post_proc entirely instead.

[JohnAFernandez]

Should probably stick a won't fix on this.

[MjnMixael]

Just checking in. If this is not going to be fixed then, given how critical the Nebula environment is to FS2 and many mods, the commandline flag should be deprecated and the Post Processing option should be removed.