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Use GL time query to probe polydata mapper rendering time.

Joachim Pouderoux requested to merge jpouderoux/vtk:AddGLTimerQueryToPolyDataMapper into master

So far the TimeToDraw was always set to 0.0001. Now the time take by the rendering calls performed by the mapper is evaluated using the time query provided by the GPU.

This patch allows to make vtkLODMapper work as expected. Limitation:

  • for new backend only.
  • not supported by GLES

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