[Bug 52625] Vertex texture fetch advertised on R300-R500 class AMD GPUs

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52625

--- Comment #2 from Stefan Dösinger <stefan at codeweavers.com> ---
Advertising VTF on r500 HW is something we shouldn't do, that sounds like a
bug. Sadly I don't have access to my r500 GPU at the moment, and won't have for
a while.

Regarding FETCH4, it is indeed unimplemented in wined3d. The reason is that we
don't know of a game that needs it and can't be made to work in some other way.
The games I know of all have some "more standard" codepath that either already
works or could be made to work - e.g. a d3d10/11 renderer that has
textureGather in its official API set, PCF shadows via regular d3d shadow
formats (aka GL_ARB_shadow). I know that e.g. 3DMark 2006 can use FETCH4, but
it will happily use the regular PCF support built into D3DFMT_D24S8, which we
do support.

Is there some GL interface to implement FETCH4 on r500 hardware? I believe the
driver supports GL_ARB_shadow, so we should be good for most situations.

(There's a better argument that can be made for DF16/DF24, which is linked to
FETCH4 though)

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