Commits on Mar 16, 2017

1. Performance fixes and cleanups found during terabyte volume rendering …

   * Fix GL texture upload 'blocking' rendering: mmap to UVF data blocks must be
     resolved/copied first before giving it to GL; otherwise driver will load
     data and locks any other concurrent GL call
   * Only upload 1 block per frame in async case to increase responsivness
   * Add idle rendering state which is active if user stops interacting; otherwise
     rendering takes minLOD level to speedup interaction
   * Fix reporting of cache sizes and hits
   * Add linear filtering support

   

   tribal-tec committed Mar 16, 2017
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