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Fix gradient background for tiled displays

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:adapt-background-for-tiled-viewports into master
  • address paraview/paraview#22559
  • The rendering of textured/gradient backgrounds is now implemented using abstract VTK rendering classes like it was done prior to !10297 (merged)
  • Basically, the previous procedure rendered a full-screen quadrilateral as an overlay by using a vtkActor2D and vtkPolyDataMapper2D. This had the benefit of correct viewport coordinate calculations when using tiled displays.
  • this MR rolls back to that approach and customizes the fragment shader for texturing or custom gradient directions.
  • It was neither possible to customize shader code of 2D actors, nor pass custom uniforms. Therefore, an additional commit adds support and tests for customizing shader code of 2D actors.
  • Even the OpenGL ES 3.0 2D mapper was updated to support custom shader replacements and uniforms.

backport: paraview/release

Edited by Jaswant Panchumarti (Kitware)

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