Maciej Cencora wrote:
> Hi,
>
> here are patches for EXT_fog_coords support for r300-r500 hw. I tested it
> only
> on rs690 hw (no tcl), so probably I've missed some code for hw tcl path.
> Progs
> I have tested the fog with:
> tests/fog
> tests/fogcoord
> demos/fogcoord
> demos/tunnel
>
>
> Here's how it works:
> 1. dedicated fog unit is disabled
> 2. stuff fog coords (along with mesa other params) as tex coord and pass it
> down to the fp (can't stuff it into color vector because GA/GB unit is
> clamping all colors to [0..1] range - the clamping can be disabled on r500 hw
> only)
> 3. calculate result color in fragment shader (fragment program is
> automagically added by mesa code).
>
> I've rewritten RS setup a little, I think it's little bit more clean now. W
> pos support in fp is probably screwed up with those patches.
>
> The fog probably could be done with dedicated fog unit but there's the
> clamping problem for r300 hw (possible solution is to scale the fog coords in
> vertex shader so they fit in [0..1] range).
>
> I'd appreciate all comments and test reports.
>
I gave it a try on a r300 and r500:
tests/fog:
- r300 : all triangles black
- r500: corrupted triangles but correct color
tests/focoord: r300/r500 all triangles white
demos/fogcoord: r300/r500 fog seems ok, but corrupted geometry
demos/tunnel: r300/r500 GPU lockups :(
Wow 3.0.8: r300/r500 GPU lockups
The patch didn't apply cleanly for me to git/master. Splitting the patch
up in rs rewrite/fogcoord stuff would make regression testing easier.
Markus
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