wined3d: Only update the sampler map when needed

[Stefan Dösinger]

On Tuesday 26 July 2011 23:13:53 Henri Verbeet wrote:
> > +        device->fixed_function_usage_map = 0xff;
> This looks questionable, it will cause unused textures to be loaded.
I'll try to cover this with my draw overhead test, but I have to get rid of 
its use of a pixel shader first.

Performance concerns aside, I don't really like loading textures depending on 
the shader or ffp settings. Currently its not an issue because we preload all 
used textures every draw, but if we want to change that one day we'll have to 
keep track of the ffp and shader states to figure out which textures to 
preload. If we ignore the shader/ffp setup when deciding which textures to 
preload we keep the states independent.
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