> Yes, several people reported a completely grey 2D panel with Radeon
> 7000/7500 cards with the DRI drivers. I also get this (with XFree86 4.1.0)
> and didn't manage to find a fix posted. The problem goes away when
> software rendering is used. It also affects the 3D panel instrument
> needles, which flicker, and disappear when the view is set exactly straight
> forwards. The cub is not affected by this though.
I think we have already identified this as related to the depth buffer
on two elements (panel and background) which have the same depth --
then, depending on rounding errors, one or the other will be rendered
on top.
May I suggest a straight-forward solution:
- For 2D panels, disable GL_DEPTH_TEST altogether. It just doesn't
make sense. The only thing you have to be careful with is that all
scenery is drawn before the panel is banged on top.
- For 3D panels, they should be made "real" 3D panels -- needles
should be some 2mm closer to the viewer than the scale. If you're
worried about performance of the many glVertex3* commands, you can
glPushMatrix, introduce a glTranslate, render the object with
glVertex2*, then glPopMatrix. I think this is a much more robust
approach than the polygon offset, which seems to be driver-specific
(sorry, still haven't had time to look at the GL specs).
What do you think?
Andras
===========================================================================
Major Andras
e-mail: [EMAIL PROTECTED]
www: http://andras.webhop.org/
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