I've been looking at the fog support on Radeon hardware (by way of
{r200,radeon}_reg.h). I've come to the conclusion that EXT_fog_coord is
supported on that hardware by way of the alpha component of the secondary /
specular color.
I've done some experiments, and I *believe* that this only works when the
secondary color uses a float format. The gotcha with this is that neither
the R100 or the R200 driver seem to support a float-format secondary color
(I haven't looked at that part of the R200 driver that closely, so I may be
wrong).
It would be easy enough to determine that the float-format should be used,
however. If I'm not mistaken, it would only be used if
FOG_COORDINATE_SOURCE_EXT == FOG_COORDINATE_SOURCE_EXT.
Is adding support for float-format secondary color already on anybody's todo
list? I don't want to work on something that somebody else is already
working on...
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