[Bug 5247] Star Wars Battlefront sky box drawn upside down

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=5247

------- Additional Comments From [e-mail]  2006-23-08 18:52 -------
pbuffers don't work.

It appears to be the projection matrix in the block at line 292 (approximately)
        if (!useVS && (This->last_was_rhw || !This->proj_valid)) {

I've tried modifying the values of invymat but I have no idea how to flip it.