Hi Fabien,

I'm currently integrating your changes.  First thumbs up from me,
you've made the integration of NVTT very clean and maintainable :-)

Now.. the tricky bits.. I've download
nvidia-texture-tools-2.0.8-1.tar.gz and compiled it.  It uses CMake
which is great, I built and installed and then attempted to configure
VPB to pick on the libs, but it didn't fine the libs.  For my build
NTT placed static libs in /usr/local/lib/static so I then added
lib/static and lib64/static to the FindNVTT script and it found them.
 Then on buildingt VPB I got an error about needing to build NVTT with
-fPIC:

/usr/bin/ld: /usr/local/lib/static/libnvtt.a(Compressor.cpp.o):
relocation R_X86_64_32S against `vtable for nv::BoxFilter' can not be
used when making a shared object; recompile with -fPIC
/usr/local/lib/static/libnvtt.a: could not read symbols: Bad value
collect2: ld returned 1 exit status

So I went into CMake and added -fPIC, rebuilt NVTT and then installed.
 This got me a bit further, but then got the error:

Linking CXX shared library ../../lib/libvpb.so
[ 88%] Built target vpb
[ 91%] Building CXX object
applications/osgdem/CMakeFiles/application_osgdem.dir/osgdem.o
Linking CXX executable ../../bin/osgdem
../../lib/libvpb.so.0.9.11: undefined reference to
`nv::Image::pixels()'
../../lib/libvpb.so.0.9.11: undefined reference to
`nv::Image::Image()'
../../lib/libvpb.so.0.9.11: undefined reference to
`nv::AlphaBlockDXT5::index(unsigned int) const'
../../lib/libvpb.so.0.9.11: undefined reference to
`nv::FloatImage::createImage(unsigned int, unsigned int) const'


Which suggests to me that I need to added NVTT to library list of
osgdem, vpbmaster, or possible just the vpb lib.   I have to go out
right now so can't tinker further.

What platform did you build and test with?

Cheers,
Robert.
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