paraview: enable VRUI support only on linux and macos

The sockets implementation needs to be updated to build on Windows.

README.md

@@ -332,7 +332,7 @@ The following flags affect ParaView directly:
     for the build that are otherwise not exposed in the superbuild itself.
   * `PARAVIEW_ENABLE_VRPLUGIN` (default `ON`): Enables the VRPlugin. If
     `vrpn` is enabled, the VRPlugin will support input devices through a VRPN
-    connection. VRUI support is enabled unconditionally.
+    connection. VRUI support is enabled unconditionally on Linux.
 
 #### ParaView editions
 

projects/paraview.cmake

@@ -88,6 +88,13 @@ mark_as_advanced(PARAVIEW_ENABLE_MOTIONFX)
 option(PARAVIEW_ENABLE_VRPLUGIN "Enable VRPlugin" ON)
 mark_as_advanced(PARAVIEW_ENABLE_VRPLUGIN)
 
+# vrui support is only available on linux
+if (PARAVIEW_ENABLE_VRPLUGIN AND UNIX)
+  list(APPEND paraview_extra_cmake_options
+    -DPARAVIEW_PLUGIN_VRPlugin_USE_VRUI:BOOL=ON
+  )
+endif()
+
 set(paraview_use_raytracing OFF)
 if (ospray_enabled OR visrtx_enabled)
   set(paraview_use_raytracing ON)
@@ -185,7 +192,6 @@ superbuild_add_project(paraview
 
     # vrpn
     -DPARAVIEW_PLUGIN_ENABLE_VRPlugin:BOOL=${PARAVIEW_ENABLE_VRPLUGIN}
-    -DPARAVIEW_PLUGIN_VRPlugin_USE_VRUI:BOOL=${PARAVIEW_ENABLE_VRPLUGIN}
     -DPARAVIEW_PLUGIN_VRPlugin_USE_VRPN:BOOL=${vrpn_enabled}
 
     # vtkm