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https://bugs.freedesktop.org/show_bug.cgi?id=9710
------- Additional Comments From [EMAIL PROTECTED] 2007-01-23 08:29 -------
(In reply to comment #3)
> While it might be possible to implement offset this way, most hardware has
> dedicated support for it elsewhere. Most probably this is because running a
> fragment program which modifies the depth value forces the hardware to turn
> off
> all sorts of early-Z and hyper-Z optimizations.
>
> Are you certain that the hardware you're looking at (r300?) needs to implement
> offset this way?
>
> ALSO: texenvprogram.c isn't the right place to do this as it won't help the
> cases where a client-supplied fragment program is in use. It seems more
> likely
> that it would be necessary to append some instructions to the compiled program
> to implement depth offset. You wouldn't want to do this to the core mesa
> program as it would depend on whether offset were enabled or not, better add a
> dependency within the driver to make program (re)compilation dependent on
> polygon offset state.
>
> DOUBLE-ALSO: I'm not sure that you can get all the gradient information
> necessary to perform the calculations in the fragment program. So you may
> just
> end up unable to do it.
>
> I'm not sure this is a good way to go about doing offset. Probably any sane
> hardware will have support for it in a different, fixed-functionality place.
r300 has had glPolygonOffset support for as long as its been able to run q3.
Anyway, there are couple other extenssions where we would need to poke
t_vp_build.c to get things going. We, for instance, have to use 2 as base in
fogc calculations instead of Euler's number.
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