RE: [4/8] [d3d9] handle invalid usage/pool combinations in CreateVolumeTexture

[Stefan Dösinger]

> As you note in your comment, most of this should go into wined3d. I
> also think this should for the most part use the same code that is
> used for CheckDeviceFormat in dlls/wined3d/directx.c. Roderick would
> probably be able to help you best there, but he's currently away.

I am not sure, ddraw has different pool requirements and behaviors I think.
e.g. ddraw can create sysmem render targets it seems. (Of course ddraw
doesn't do volume textures, but I think we shouldn't apply different rules
to volume and 2D textures)