32-bit textures

[David Gobbi]

Hi All,

I've added some new methods to vtkTexture, but would like to check them
by everyone before committing them:

vtkTexture::SetQualityToDefault() 
vtkTexture::SetQualityTo16Bit()
vtkTexture::SetQualityTo32Bit()

These methods are needed on some systems to force VTK to use 
32-bit texture maps.  It can also be very useful to force VTK
to use 16-bit texture maps to save memory e.g. when using 
textures for volume rendering.

I'm also considering a SetQualityToIndex() method, which would
allow VTK to transfer the texture to OpenGL as set of colormap 
indices [0,255] as well as the texture's lookup table.  This would 
only be worthwhile on OpenGL implementations that can do color 
mapping in hardware, though -- is this a common feature of 
OpenGL video cards?  

 - David

--
  David Gobbi, MSc                    dgobbi at irus.rri.on.ca
  Advanced Imaging Research Group
  Robarts Research Institute, University of Western Ontario

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