fix: add workaround to avoid viewer crash on MacOS

CMakeLists.txt

@@ -23,6 +23,11 @@ endif()
 option(USE_CLANG_TIDY "use clang-tidy" OFF)
 option(LINT_AS_ERRORS "clang-tidy warnings as errors" OFF)
 
+if(BUILD_QT)
+    option(QT3D_USE_RHI "Qt use RHI" OFF)
+    message(STATUS "QT3D_USE_RHI: ${QT3D_USE_RHI}")
+endif()
+
 find_program(
     CLANG_TIDY_EXE
     NAMES "clang-tidy"
@@ -149,8 +154,6 @@ endif()
 add_subdirectory(cpp/binary/pymod_modmesh)
 if(BUILD_QT)
 add_subdirectory(cpp/binary/viewer)
-set(ENV{QT3D_RENDERER} ${QT3D_RENDERER})
-message(STATUS "QT3D_RENDERER: " $ENV{QT3D_RENDERER})
 endif()
 
 add_custom_target(flake8)

Makefile

@@ -36,7 +36,7 @@ CMAKE_PREFIX_PATH ?=
 CMAKE_ARGS ?=
 VERBOSE ?=
 FORCE_CLANG_FORMAT ?=
-QT3D_RENDERER ?=
+QT3D_USE_RHI ?= OFF
 
 # !!! NOTE: USING ANY VENV IS STRONGLY DISCOURAGED IN DEVELOPING MODMESH !!!
 # This treatment is a "smarter" way to find python3-config executable.
@@ -92,7 +92,7 @@ CMAKE_CMD = cmake $(MODMESH_ROOT) \
 	-DUSE_CLANG_TIDY=$(USE_CLANG_TIDY) \
 	-DLINT_AS_ERRORS=ON \
 	-DMODMESH_PROFILE=$(MODMESH_PROFILE) \
-	-DQT3D_RENDERER=$(QT3D_RENDERER) \
+	-DQT3D_USE_RHI=$(QT3D_USE_RHI) \
 	$(CMAKE_ARGS)
 
 $(BUILD_PATH)/Makefile: CMakeLists.txt Makefile

cpp/binary/viewer/CMakeLists.txt

@@ -101,4 +101,4 @@ install(TARGETS viewer
     RUNTIME DESTINATION "${INSTALL_VIEWERDIR}"
     BUNDLE DESTINATION "${INSTALL_VIEWERDIR}"
     LIBRARY DESTINATION "${INSTALL_VIEWERDIR}"
-)
+)

cpp/modmesh/CMakeLists.txt

@@ -164,4 +164,12 @@ else () # MSVC
     )
 endif () # MSVC
 
+if(QT3D_USE_RHI)
+    target_compile_options(modmesh_primary PRIVATE
+        ${COMMON_COMPILER_OPTIONS}
+        -DQT3D_USE_RHI
+    )
+endif() # QT3D_USE_RHI
+
+
 # vim: set ff=unix fenc=utf8 nobomb et sw=4 ts=4 sts=4:

cpp/modmesh/view/wrap_view.cpp

@@ -497,6 +497,12 @@ OneTimeInitializer<view_pymod_tag> & OneTimeInitializer<view_pymod_tag>::me()
 
 void initialize_view(pybind11::module & mod)
 {
+// TODO: There is some bug in QT RHI, this is a workaround to force QT use opengl directly
+#if defined (QT3D_USE_RHI)
+    qputenv("QT3D_RENDERER", "rhi");
+#else
+    qputenv("QT3D_RENDERER", "opengl");
+#endif // QT3D_USE_RHI
     auto initialize_impl = [](pybind11::module & mod)
     {
         wrap_view(mod);