[Bug 39057] Support for Indexed Vertex Blending

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39057

--- Comment #13 from swswine at gmail.com ---
Thank you very much for clarification.

I will get back to this and try implementing this patch through uniform buffer
objects within a couple of weeks when I have more time.

Regarding software & H/W vertex processing, the games I've seen using indexed
vertex blending (IVB) had configuration option to choose between software and
hardware vertex processing, but IVB was used in both modes. I had
MaxVertexBlendMatrixIndex constantly set to 0 initially in my patched wined3d
(updated this field setting in the patch later), this was ignored by these
games, they used as much VB matrices they wanted without any error. So is it
possible that at least some (or many) Windows drivers advertise 0 matrices in
H/W mode but actually support up to 256 if requested? If yes, should not wine
d3dx9 just do the same: just support IVB with 256 matrices in H/W mode (and in
software mode when it is in place) but advertise 0 in H/W mode (or let this
value to be configured)?

BTW I came across similar issue with number of supported uniforms in HLSL
shader. DX9 advertises max of 256 uniforms. I came through some games failing
to compile HLSL vertex shader under wine due to excessive number of uniforms
they were trying to use. I worked that around by simply increasing the constant
for max number of uniforms in wine d3d9, it worked. Apparently these games work
on Windows which means that Windows drivers do support bigger number of
uniforms per HLSL shader while advertising 256. Should not wine do the same:
advertise 256 but allow up to the limit actually supported by underlying GL
driver?

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