paraview: drop the rendering backend option

ParaView now only supports the newer, OpenGL2 backend.

CMakeLists.txt

@@ -137,11 +137,6 @@ function (superbuild_sanity_check)
     message(SEND_ERROR "Cannot enable EGL and Mesa at the same time.")
   endif ()
 
-  # Sanity check: Must use OpenGL2 backed with EGL
-  if (egl_enabled AND NOT PARAVIEW_RENDERING_BACKEND STREQUAL "OpenGL2")
-    message(SEND_ERROR "Cannot enable EGL with the old VTK rendering backend at the same time.")
-  endif ()
-
   # Sanity check: Cannot have EGL and OSMesa at the same time.
   if (egl_enabled AND osmesa_enabled)
     message(SEND_ERROR "Cannot enable EGL and OSMesa at the same time.")

README.md

@@ -104,9 +104,8 @@ The `paraviewgettingstartedguide`, `paraviewtutorial`, `paraviewtutorialdata`,
 and `paraviewusersguide` packages add documentation to the package.
 
 ParaView supports multiple rendering engines including `egl`, `mesa`,
-`osmesa`, and `qt4`. All of these are incompatible with each other. In
-addition, the `egl` renderer requires the `OpenGL2` rendering backend. If none
-of these are chosen, a UI-less ParaView will be built (basically just
+`osmesa`, and `qt4`. All of these are incompatible with each other. If none of
+these are chosen, a UI-less ParaView will be built (basically just
 `pvpython`). `qt5` is also available, but is not known to be ready. On Windows
 and macOS, only the `qt` packages are available.
 
@@ -252,8 +251,6 @@ The following flags affect ParaView directly:
   * `CMAKE_BUILD_TYPE_paraview` (default is the same as the superbuild):
     ParaView may be built with a different build type (e.g., `Release` vs.
     `RelWithDebInfo`) as the rest of the superbuild using this variable.
-  * `PARAVIEW_RENDERING_BACKEND` (default `OpenGL2`): The rendering backend to
-    use with ParaView.
   * `PARAVIEW_BUILD_WEB_DOCUMENTATION` (default `OFF`): Have ParaView build
     its HTML documentation.
   * `mesa_USE_SWR` (default `ON`): If `mesa` is enabled, this enables

projects/paraview.cmake

@@ -31,12 +31,6 @@ if (qt4_enabled OR qt5_enabled)
   set(paraview_use_qt ON)
 endif ()
 
-set(PARAVIEW_RENDERING_BACKEND "OpenGL2"
-  CACHE STRING "Rendering backend to use for ParaView")
-set_property(CACHE PARAVIEW_RENDERING_BACKEND
-  PROPERTY
-    STRINGS "OpenGL;OpenGL2")
-
 option(PARAVIEW_BUILD_WEB_DOCUMENTATION "Build documentation for the web" OFF)
 
 set(paraview_all_plugins
@@ -151,7 +145,6 @@ superbuild_add_project(paraview
     -DVTK_USE_SYSTEM_PNG:BOOL=${png_enabled}
     -DVTK_USE_SYSTEM_ZLIB:BOOL=${zlib_enabled}
     -DModule_vtkIOADIOS:BOOL=${adios_enabled}
-    -DVTK_RENDERING_BACKEND:STRING=${PARAVIEW_RENDERING_BACKEND}
     -DVTK_SMP_IMPLEMENTATION_TYPE:STRING=${paraview_smp_backend}
     -DVTK_LEGACY_SILENT:BOOL=ON
     -DVTK_OPENGL_HAS_OSMESA:BOOL=${osmesa_enabled}

projects/paraview.suffix.cmake

@@ -9,10 +9,6 @@ if (qt5_enabled)
   list(APPEND package_suffix_items
     Qt5)
 endif ()
-if (paraview_enabled AND PARAVIEW_RENDERING_BACKEND STREQUAL "OpenGL2")
-  list(APPEND package_suffix_items
-    OpenGL2)
-endif ()
 if (mpi_enabled)
   list(APPEND package_suffix_items
     MPI)