[PATCH 3/7] d3dx9: Implement D3DXCheckTextureRequirements.

[Philip Nilsson]

This could use some more work, but I doubt people really use it much in
weird ways.

Tested on Vista and Wine inside and outside a chroot.  I found it
depended almost entirely on the results of CheckDeviceFormat, so it's
not that easy to test.  Wine's especially doesn't support as many
formats as Windows does.

I intend to rewrite it using something that's more in line with what's
described on MSDN, some kind of list where you filter away all the
entries that do not match, and so on.  It'd probably require copying
over the pixel format table from wined3d though (and perhaps extending
it further).
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