[g2.2pre-1729-g849ee50] Slope height bug in OpenGL renderer

[ZZYZX]

This also seems to happen with earlier versions (at least devbuilds).

I've drawn a hemisphere-like shape and it seems to be drawn okay by software and GZDB, but fails to render properly under OpenGL.

GZDB (aka what's expected):


Software (of the same GZDoom version, with vid_renderer 0):


OpenGL:


Minimal example with this shape: http://www.mediafire.com/download/qp4pw ... e/ART2.wad

Happens in both 32bit and 64bit versions.

[Graf Zahl]

fixed