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https://bugs.freedesktop.org/show_bug.cgi?id=2766
Summary: texgen GL_SPHERE_MAP should not cause a tcl fallback
Product: Mesa
Version: CVS
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Drivers/DRI/r200
AssignedTo: dri-devel@lists.sourceforge.net
ReportedBy: [EMAIL PROTECTED]
currently, GL_SPHERE_MAP texgen causes a tcl fallback, which should not be
necessary (and this fallback causes lots of z fighting with for instance
tuxracer or nwn, though this is supposedly the apps fault).
The fallback is used since the results with hw tcl are wrong. Some analysis with
fglrx shows that this driver sets R200_LOCAL_VIEWER in the tcl lighting model
control with at least the simple samples/sphere app, and when hacking this into
the r200 driver (I have really no idea where and when...) this indeed fixes at
least isosurf (in reflect mode) and sphere as far as I can tell, and tuxracer
also seems to look correct. This also easily explains why sometimes the
GL_SPHERE_MAP indeed worked correctly (for instance in gloss, this sets the
GL_LIGHT_MODEL_LOCAL_VIEWER to true).
I do not really understand the lighting model nor its interaction with the r200
chip, so I have no idea how a proper fix would look like unfortunately. I guess
always setting this bit would cause errors in other places?
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