Corbin Simpson wrote:
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> The attached patches enable GL_EXT_fog_coord for r300, and also enable
> SW TCL to correctly route fog coordinates. This is sufficient to get fog
> coords working on the current git head.
>
> I'd like some review, because although it's a cool thought to think that
> just these few lines, plus the recent change in fragment program
> generation, magically make things work, I've fought against fog for too
> long to just assume that it's "that simple." :3
Nice, never imagined it could be that simple.
Wow on my r500 definitely looks a lot better with this patches :).
But with enabled fragment/vertex shaders the fog effect disappears.
Also progs/tests/fogcoord doesn't work here.
IIRC with enabled vertex/fragment shaders the fixed function fog stuff
is bypassed, and we should rewrite the shaders to emulate the fog behaviour.
Also the r500 specs mentions in section 6.5.1 :
Discrete Fog resides in one of Color 0-3 alpha.
I'm not even sure Discrete Fog are fog coordinates.
Just some thoughts.
Markus
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