[PATCH 2/5] wined3d: Handle fog_start==fog_end with table fog(try 2)

[Stefan Dösinger]

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Am 2013-06-18 12:53, schrieb Henri Verbeet:
> (And that one is only supported by Mesa anyway, so there should be 
> no reason to not just fix the driver instead.)
Well, in theory. In practice I'd need the register documentation. I
had a very quick look at the mesa code, and it isn't as simple as
removing something like "if (start == end) annoy_wine();". There's a
register flag R200_FOG_TABLE that may or may not provide what d3d wants.

Supposedly the register documentation of r200 is available, but Google
doesn't find it.

>> I can deal with ARB in another way, by implementing the fog 
>> equation myself instead of using #option ARB_fog_linear. That 
>> would throw pre-sm2 hardware under the bus though.
>> 
> Yeah, we probably don't want that. I think the value of the ARB 
> program backend is limited, but it's main target should be pre-SM2
>  hardware that can't do GLSL. (And potentially still has dedicated 
> fog hardware.)
Since I'm still maintaining the ARB code, I prefer something like the
attached patch over failing tests any time.
(It's not quite done yet. The patch needs splitting, the quirk test
should test an ARB shader and I'll probably limit the custom code to
start == end cases.)

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