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COMP: Detect the VTK rendering backend from imported targets #6850

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Merged
hjmjohnson merged 1 commit into from
Sep 7, 2026
+26 −10
Merged

COMP: Detect the VTK rendering backend from imported targets #6850

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12 changes: 10 additions & 2 deletions Modules/Bridge/VtkGlue/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,11 @@ set(
set(VTK_DIR \"${VTK_DIR}\")
find_package(VTK 9.1 NO_MODULE REQUIRED)
if(NOT VTK_RENDERING_BACKEND)
set(VTK_RENDERING_BACKEND OpenGL2)
if(TARGET VTK::RenderingOpenGL2)
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set(VTK_RENDERING_BACKEND OpenGL2)
else()
set(VTK_RENDERING_BACKEND None)
endif()
endif()
set(_target_freetypeopengl)
if(TARGET VTK::RenderingFreeType\${VTK_RENDERING_BACKEND})
Expand Down Expand Up @@ -123,7 +127,11 @@ if(NOT ITK_BINARY_DIR)
set(VTK_DIR \"${VTK_DIR}\")
find_package(VTK 9.1 NO_MODULE REQUIRED)
if(NOT VTK_RENDERING_BACKEND)
set(VTK_RENDERING_BACKEND OpenGL2)
if(TARGET VTK::RenderingOpenGL2)
set(VTK_RENDERING_BACKEND OpenGL2)
else()
set(VTK_RENDERING_BACKEND None)
endif()
endif()
set(_target_freetypeopengl)
if(TARGET VTK::RenderingFreeType\${VTK_RENDERING_BACKEND})
Expand Down
7 changes: 6 additions & 1 deletion Modules/Bridge/VtkGlue/itk-module-init.cmake
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Expand Up @@ -16,8 +16,13 @@ set(VERSION_MIN "9.1.0")

find_package(VTK ${VERSION_MIN} NO_MODULE REQUIRED)

# VTK 9 omits VTK_RENDERING_BACKEND; infer rendering support from its OpenGL2 target.
if(NOT VTK_RENDERING_BACKEND)
set(VTK_RENDERING_BACKEND OpenGL2)
if(TARGET VTK::RenderingOpenGL2)
set(VTK_RENDERING_BACKEND OpenGL2)
else()
set(VTK_RENDERING_BACKEND None)
endif()
endif()

set(_target_freetypeopengl)
Expand Down
17 changes: 10 additions & 7 deletions Modules/Bridge/VtkGlue/wrapping/itkViewImage.wrap
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Original file line number Diff line number Diff line change
@@ -1,8 +1,11 @@
itk_wrap_class("itk::ViewImage")
unique(types "${WRAP_ITK_SCALAR}")
foreach(d ${ITK_WRAP_IMAGE_DIMS})
foreach(t ${types})
itk_wrap_template("${ITKM_I${t}${d}}" "${ITKT_I${t}${d}}")
# itk::ViewImage needs vtkRenderWindow, absent from a rendering-free VTK.
if(NOT VTK_RENDERING_BACKEND STREQUAL "None")
itk_wrap_class("itk::ViewImage")
unique(types "${WRAP_ITK_SCALAR}")
foreach(d ${ITK_WRAP_IMAGE_DIMS})
foreach(t ${types})
itk_wrap_template("${ITKM_I${t}${d}}" "${ITKT_I${t}${d}}")
endforeach()
endforeach()
endforeach()
itk_end_wrap_class()
itk_end_wrap_class()
endif()
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