Water colour varies on pitch

[rakiru]

Looking lower than 0 degrees (horizontal, unsure if that is technically 0 degrees) hides the water colour, and makes the water transparent. The waving effect around the arms/gun show the colour, however.

AMD Radeon 7850, Windows 7 x64

SystemMessages.log, in case it's useful:

[noway]

Same hardware and same problem for me. AMD Radeon 7850, ubuntu 13.10 amd64.
Also, similar shader problem with this hardware appears in Counter Strike: Source and Half-Life: episode 2. Sometimes the water becomes completely transparent like on second screen by @rakiru

Looks like it's problem with drivers or even hardware itself. Maybe there is workaround for this?

[mueba]

Same bug, radeon 7850, win7 x64

[yvt]

This issue could be reproduced with other video cards by removing certain abs call, so I moved the call to abs function. I'm not sure if this does.

[noway]

I tested, now water looks as should. It's working!