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Optimize out unncessary OpenGL state queries

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:speed-up-selections into master
  • Adds a new method to retrieve the size of allocation of an OpenGL buffer object
  • Avoids calling glGetError in hardware selector pass when VTK is configured not to report OpenGL errors.
  • Follows tips from emscripten-Optimizing-WebGL
Edited by Jaswant Panchumarti (Kitware)

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