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# Default code to handle VTK backends. The module.cmake files specify
# which backend the modules are in. We can specify some more specific
# documentation for backends in this file that will be displayed in
# cmake-gui and ccmake.
#
# The OpenGL backend is the current default, and the OpenGL2 backend is
# the new rendering code. This differs from groups in that only one backend
# can be built/linked to at any given time. The backend modules should use a
# naming convention where the backend name is the final word in the
# module name, i.e. vtkRenderingOpenGL for OpenGL and vtkRenderingOpenGL2
# for OpenGL2.
# is the current backend not a valid value?
set (_options ${VTK_BACKENDS} "None")
list (FIND _options "${VTK_RENDERING_BACKEND}" _index)
if (${_index} EQUAL -1)
# has the application defined a desired default for the backend?
# if not, use VTKs default of OpenGL
if(NOT DEFINED VTK_RENDERING_BACKEND_DEFAULT)
set(VTK_RENDERING_BACKEND_DEFAULT "OpenGL")
endif()
# if it is in the cache as a bad value we need to reset it
if(DEFINED VTK_RENDERING_BACKEND)
message(STATUS "The cache contains an illegal value for VTK_RENDERING_BACKEND, forcing it to the default value of '${VTK_RENDERING_BACKEND_DEFAULT}'.")
set(VTK_RENDERING_BACKEND "${VTK_RENDERING_BACKEND_DEFAULT}" CACHE STRING
"Choose the rendering backend." FORCE)
else()
# otherwise just initialize it to the default determined above
message(STATUS "Setting rendering backend to '${VTK_RENDERING_BACKEND_DEFAULT}' as none was specified.")
set(VTK_RENDERING_BACKEND "${VTK_RENDERING_BACKEND_DEFAULT}" CACHE STRING
"Choose the rendering backend.")
endif()
# Set the possible values of rendering backends for cmake-gui
set_property(CACHE VTK_RENDERING_BACKEND PROPERTY
STRINGS ${_options})
endif()
# Now iterate through and enable the one that was selected.
foreach(backend ${VTK_BACKENDS})
message(STATUS "Backend ${backend} modules: ${VTK_BACKEND_${backend}_MODULES}")
if(${backend} STREQUAL "${VTK_RENDERING_BACKEND}")
message(STATUS "Enabling modules for ${backend}.")
foreach(module ${VTK_BACKEND_${backend}_MODULES})
list(APPEND ${${module}_IMPLEMENTS}_IMPLEMENTATIONS ${module})
endforeach()
endif()
endforeach()
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