Hi,
when I move a gl window to the right and/or bottom edge of the screen,
a one pixel wide line/row is not redrawn correctly. Sometimes parts of
previous frames remain visible and even hide new stuff. It looks to me
as if the z-buffer is not cleared in that line/row.
I can reproduce the problem with the xscreensaver circuit demo, quake2
without fullscreen and quake1. Probably more non-fullscreen apps which
draw till the edge of the window.
My color depth is 16 bits. I tried the resolutions 1152x864 and
1024x768. While I was experimenting with different color depths I saw
some more problems. With 24 bits I see everything like through a mesh,
but slightly different meshes in different parts of the screen. It is
black in the beginning but it can be overwritten by very close objects
like my own gun (sometimes) or the polygons drawn to flash the screen.
So it may be z-buffer related as well. With 15 bits colors look
strange. I guess the driver generates 16 bit colors and puts them on a
15 bit screen. And in quake3 fullscreen the resolution is not changed.
I just get a small quake3 "window" in the bottom left corner of a black
screen. But that might be a problem in the Xvidmode extension, not the
DRI.
With 15 bits I have the same artefacts on the right/bottom edge. With
24 bits ... I can't tell ;-)
Regards,
Felix
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