[Bug 20626] r200 texgen with glVertex4f(x, y, z, w) error

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=20626





--- Comment #3 from raoxianhong <rao...@16...>  2009-03-12 23:16:32 PST ---
(In reply to comment #2)
> (In reply to comment #0)
> > When I use texgen with glVertex4f(x, y, z, w) on r200(ATI Radeon Mobility 9000
> > card), the s coord texgen use (px, py, pz, pw), but I found s coord always be
> > px * x + py * y + pz * z + pw, not expected px * x + py * y + pz * z + pw * w
> > as if w is always 1.0f.
> Note that the r200 has some hw limitations wrt to texgen, so some cases
> (particularly if you enable texgen only on some coords) might not work
> correctly. That said, what you're doing should work - I assume it does if you
> use sw tnl (tcl_mode=0 or use driconf)? You've got a very old mesa version
> however, does this also happen with something newer?

Thank for replay,
I use the texgen function use with GL_OBJECT_LINEAR option and expexted tex
coord as px * x + py * y + pz * z + pw * w, it looks like r200 set object coord
to normalized (x/w, y/w, z/w, 1.0), so the result is px * x / w + py * y / w +
pz * z / w + pw, is it a hw limitation or parameter setting bug?


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