wined3d: Add WINED3D_BUFFER_HASDESC at index buffer creation

[Norbert Lataille]

Hi,

Goal of this patch is to help creation of buffer objects for Index buffers.
I currently see many cases where wined3d doesn't create Buffer Objects
for Indexes,
which looks like an unwanted side effect of VBO Desc logic.

Patch is forcing WINED3D_BUFFER_HASDESC flag at Index Buffer creation time,
but there may be other (better) ways to achieve the same result in buffer.c

Performance gains on 3dmark06: http://norbert.lataille.free.fr/boindex.html
Impact on X3TC, WoW is less visible:
http://norbert.lataille.free.fr/perf.html (line: Index).

Comments are welcome,

Thanks,

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 dlls/wined3d/buffer.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
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