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Fix HardwarePicking for OpenGL ES 3

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:fix-hardware-selector-gles into master
  • The Z buffer cannot be read with glReadPixels(.., GL_DEPTH_COMPONENT,..) in gles.
  • This commit works around by reading the depth attachment into a color attachment (RGBA).
  • The acceptable combinations of glformat, gltype arguments for glReadPixels is very constrained, hence we need to cast as needed.
  • Define GL_BACK_[RIGHT, LEFT], GL_FRONT_[RIGHT, LEFT]* as GL_BACK and GL_FRONT for gles.
  • closes #18734 (closed)
Edited by Jaswant Panchumarti (Kitware)

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