Support RTCW enable/disable shader per-stage fogging about spearmint HOT 3 CLOSED

not sure this is doable... fog the whole shader at the end, would need to mask images to apply fog to correct parts.

I should look at what the usage of this even is. Maybe it's used to disable double fogging on transparent layers? (In which case might not need it for software fog.)

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Actually last comment may be completely wrong. Found a patch I wrote that might work, but hasn't been tested...

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It looks like all the shaders 'fog on' is used in RTCW are to avoid adding fog color multiple times when blending stages. Finished adding 'software fog' support in f015e62 (apply fog color if any stage uses 'fog on') and 228d418 (fix fogging some shaders that use 'fog on').

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