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Add sample based for QtQuick/QML
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‎CMakeLists.txt‎

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add_subdirectory (occt-qwidget)
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add_subdirectory (occt-qopenglwidget)
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add_subdirectory (occt-qtquick)

‎ReadMe.md‎

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as Qt will be able to blend widgets together on its own.
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![sample screenshot](/images/occt-qopenglwidget-sample-x11.png)
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## OCCT QtQuick/QML sample
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Project within `occt-qtquick` subfolder shows initialization of OCCT 3D viewer
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from OpenGL context created by `QQuickFramebufferObject` within Qt5 QtQuick/QML application.
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The approach with `QQuickFramebufferObject` requires careful gluing layer for Qt and OCCT 3D Viewer to share common OpenGL context.
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`QtQuick` by default will attempt offloading rendering into a separate working thread (`QSGRenderThread`) on some systems,
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which requires addition of multithreading synchronization mechanism when dealing with OCCT 3D Viewer from GUI thread.
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Uncomment lines setting `QSG_RENDER_LOOP` environment variable,
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if these complexities are undesired to ask Qt managing rendering from GUI thread.

‎occt-qtquick/CMakeLists.txt‎

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cmake_minimum_required (VERSION 3.2)
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project (occt-qtquick-sample)
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set (CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../adm/cmake" ${CMAKE_MODULE_PATH})
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set (APP_VERSION_MAJOR 1)
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set (APP_VERSION_MINOR 0)
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# compiler flags
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set (CMAKE_CXX_STANDARD 11)
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if (MSVC)
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set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /fp:precise /EHa /MP")
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string (REGEX REPLACE "/EHsc" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
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add_definitions (-D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE -DUNICODE)
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else()
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set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fexceptions -fPIC")
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add_definitions (-DOCC_CONVERT_SIGNALS)
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endif()
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# increase compiler warnings level (-W3 for MSVC, -Wextra for GCC)
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if (MSVC)
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if (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
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string (REGEX REPLACE "/W[0-4]" "/W3" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
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else()
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set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W3")
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endif()
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elseif (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
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set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
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if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
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set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wshorten-64-to-32")
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endif()
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if (BUILD_SHARED_LIBS)
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if (APPLE)
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set (CMAKE_SHARED_LINKER_FLAGS "-lm ${CMAKE_SHARED_LINKER_FLAGS}")
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elseif (NOT WIN32)
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set (CMAKE_SHARED_LINKER_FLAGS "-lm ${CMAKE_SHARED_LINKER_FLAGS}")
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endif()
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endif()
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endif()
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# Find dependencies
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set (OpenCASCADE_DIR "" CACHE PATH "Path to Open CASCADE libraries.")
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if (MSVC)
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set (3RDPARTY_DLL_DIRS "" CACHE STRING "Paths to external DLLs separated by semicolon (FreeImage, FreeType, etc.)")
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endif()
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# Find OpenGL
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find_package (OpenGL REQUIRED)
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# Find Qt
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set (QT_VERSION "Qt5" CACHE STRING "Qt major version to use")
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set_property (CACHE QT_VERSION PROPERTY STRINGS Qt5 Qt6)
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set (CMAKE_AUTOUIC ON)
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set (CMAKE_AUTOMOC ON)
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set (CMAKE_AUTORCC ON)
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set_property (GLOBAL PROPERTY AUTOMOC_SOURCE_GROUP "Generated Files/Moc")
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set_property (GLOBAL PROPERTY AUTORCC_SOURCE_GROUP "Generated Files/Resources")
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set (Qt_COMPONENTS Core Gui Qml Quick QuickControls2 Widgets)
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set (Qt_LIBS)
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foreach (aLibIter ${Qt_COMPONENTS})
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list (APPEND Qt_LIBS "${QT_VERSION}::${aLibIter}")
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endforeach()
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find_package (${QT_VERSION} COMPONENTS ${Qt_COMPONENTS} REQUIRED)
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message (STATUS "Using ${QT_VERSION} from \"${${QT_VERSION}_DIR}\"")
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# Find Open CASCADE Technology
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find_package (OpenCASCADE REQUIRED)
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if (NOT OpenCASCADE_FOUND)
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message (FATAL_ERROR "could not find OpenCASCADE, please set OpenCASCADE_DIR variable" )
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else()
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message (STATUS "Using OpenCASCADE from \"${OpenCASCADE_INSTALL_PREFIX}\"" )
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message (STATUS "OpenCASCADE_INCLUDE_DIR=${OpenCASCADE_INCLUDE_DIR}")
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message (STATUS "OpenCASCADE_LIBRARY_DIR=${OpenCASCADE_LIBRARY_DIR}")
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include_directories(${OpenCASCADE_INCLUDE_DIR})
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link_directories (${OpenCASCADE_LIBRARY_DIR})
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endif()
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set (OpenCASCADE_LIBS TKRWMesh TKBinXCAF TKBin TKBinL TKOpenGl TKXCAF TKVCAF TKCAF TKV3d TKHLR TKMesh TKService TKShHealing TKPrim TKTopAlgo TKGeomAlgo TKBRep TKGeomBase TKG3d TKG2d TKMath TKLCAF TKCDF TKernel)
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# main project target
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add_executable (${PROJECT_NAME}
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main.cpp
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main.qml
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OcctGlTools.h
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OcctGlTools.cpp
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OcctQtTools.h
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OcctQQuickFramebufferViewer.h
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OcctQQuickFramebufferViewer.cpp
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occt-qtquick.qrc
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)
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target_link_libraries (${PROJECT_NAME} PRIVATE
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${Qt_LIBS}
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${OpenCASCADE_LIBS}
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${OPENGL_LIBRARIES}
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)
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# auxiliary development environment
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if (MSVC)
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set (X_COMPILER_BITNESS x64)
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get_target_property (QtCore_location ${QT_VERSION}::Core LOCATION)
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get_filename_component (QT_BINARY_DIR ${QtCore_location} DIRECTORY)
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set (QT_PLUGINS_DIR)
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if (EXISTS "${QT_BINARY_DIR}/../plugins")
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set (QT_PLUGINS_DIR "${QT_BINARY_DIR}/../plugins")
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endif()
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get_target_property (aTKernelRel "TKernel" IMPORTED_LOCATION_RELEASE)
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get_target_property (aTKernelDbg "TKernel" IMPORTED_LOCATION_DEBUG)
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get_filename_component (OpenCASCADE_BINARY_DIR_RELEASE ${aTKernelRel} DIRECTORY)
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get_filename_component (OpenCASCADE_BINARY_DIR_DEBUG ${aTKernelDbg} DIRECTORY)
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if (NOT EXISTS "${OpenCASCADE_BINARY_DIR_DEBUG}" AND EXISTS "${OpenCASCADE_BINARY_DIR_RELEASE}")
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set (OpenCASCADE_BINARY_DIR_DEBUG "${OpenCASCADE_BINARY_DIR_RELEASE}")
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elseif (NOT EXISTS "${OpenCASCADE_BINARY_DIR_RELEASE}" AND EXISTS "${OpenCASCADE_BINARY_DIR_DEBUG}")
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set (OpenCASCADE_BINARY_DIR_RELEASE "${OpenCASCADE_BINARY_DIR_DEBUG}")
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endif()
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set_target_properties (${PROJECT_NAME} PROPERTIES
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VS_DEBUGGER_ENVIRONMENT "\
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PATH=%PATH%;$<IF:$<CONFIG:Debug>,${OpenCASCADE_BINARY_DIR_DEBUG},${OpenCASCADE_BINARY_DIR_RELEASE}>;${3RDPARTY_DLL_DIRS};${QT_BINARY_DIR}\n\
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QT_PLUGIN_PATH=${QT_PLUGINS_DIR}"
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)
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endif()

‎occt-qtquick/OcctGlTools.cpp‎

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// Copyright (c) 2023 Kirill Gavrilov
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#include "OcctGlTools.h"
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#include <OpenGl_GraphicDriver.hxx>
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#include <OpenGl_FrameBuffer.hxx>
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#include <OpenGl_View.hxx>
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#include <OpenGl_Window.hxx>
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// ================================================================
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// Function : GetGlContext
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// ================================================================
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Handle(OpenGl_Context) OcctGlTools::GetGlContext(const Handle(V3d_View)& theView)
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{
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Handle(OpenGl_View) aGlView = Handle(OpenGl_View)::DownCast(theView->View());
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return aGlView->GlWindow()->GetGlContext();
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}

‎occt-qtquick/OcctGlTools.h‎

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// Copyright (c) 2023 Kirill Gavrilov
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#ifndef _OcctGlTools_HeaderFile
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#define _OcctGlTools_HeaderFile
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#include <V3d_View.hxx>
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class OpenGl_Context;
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//! Auxiliary wrapper to avoid OpenGL macros collisions between Qt and OCCT headers.
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class OcctGlTools
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{
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public:
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//! Return GL context.
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static Handle(OpenGl_Context) GetGlContext(const Handle(V3d_View)& theView);
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};
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#endif // _OcctGlTools_HeaderFile

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