Emulator

This was already broken in r5895, probably "fixed" by r5896, which started to use the broken depth result from the vertex shader instead of the correct(?) one from the pixel shader. r6056, r6061 and r6078 modified the depth calculation in the vertex shader to give the same result as the calculation in the pixel shader.

I compared the results of r5895, r6055 and r6078 against a youtube video captured from the real game at the place visible in fog1heq9.png, and none of them were correct.
r5895 showed "depthbanding"(i.E. abrupt change of fogginess visible on the walls)
r6055 shows too few fog, the far door should be much more grayish
r6078 is similar to r5895 again

One of the bands in r5895/r6078 looks right, but the banding is still wrong.

Please try r6217 which should fix this issue.

I have rechecked the issue with r6269 and I can say it´s 99% fixed,
you need a loupe and very good eyes to see the remaining graphical issue.
I would say you can put the Status to fixed, good job pierre :)