[PATCH] wined3d: Don't accept WINED3DFMT_NULL

[Stefan Dösinger]

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Am 2016-05-22 um 13:23 schrieb Józef Kucia:
> Yes, the handling of WINED3DFMT_NULL textures could be improved. We
> should ensure that WINED3DFMT_NULL won't ever have a GL texture 
> allocated.
I'd love to have D3DFMT_NULL textures handled in d3d8 / d3d9, and just
set the render target to NULL in wined3d in that case. Afaik having no
render target is valid in d3d10.

Obviously that means we'll have to handle mapping those textures in
the client libraries, which might make this approach uglier than the
current one.
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