Modify DDP occlusion queries for OGL ES 3.0.
Modify DDP occlusion queries for OGL ES 3.0.

ES 3.0 only supports the ANY_SAMPLES_PASSED query, so use that instead.
We ignore the occlusion ratio in this case, and instead will only
abort early if all fragments pass (essentially acting as though
OcclusionRatio == 0.).

SimVascular/VTK,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix,keithroe/vtkoptix,SimVascular/VTK,SimVascular/VTK,keithroe/vtkoptix,keithroe/vtkoptix,keithroe/vtkoptix,SimVascular/VTK,SimVascular/VTK,SimVascular/VTK