Merge branch 'qt6' into 'master'

Qt6 integration

See merge request OpenMesh/OpenMesh!304

.gitlab-ci.yml

@@ -32,6 +32,231 @@ cppcheck:
     paths:
       - cppcheck.log
 
+#-----------  Job Informations:
+# Type:       Build: debug
+# OS:         Linux
+# Compiler:   gcc
+# Language:   cpp11
+# QT Version: qt6.0.0
+
+build-debug-gcc-cpp11-qt6.0.0:
+  stage: build
+  script: "CI/ci-linux-build.sh"
+  #image: gitlab.vci.rwth-aachen.de:4567/docker/docker/docker-openmesh-container
+  tags:
+    - Linux
+    - stretch
+  variables:
+    COMPILER: "gcc"
+    LANGUAGE: "cpp11"
+    BUILD_TYPE: "debug"
+    QTVERSION: "qt6.0.0"
+    IWYU: "no"
+    VECTORCHECKS: "yes"
+  artifacts:
+    paths:
+    - build-gcc-cpp11-qt6.0.0-debug-vectorchecks/
+
+#-----------  Job Informations:
+# Type:       Test: debug
+# OS:         Linux
+# Compiler:   gcc
+# Language:   cpp11
+
+test-debug-gcc-cpp11-qt6.0.0:
+  stage: test
+  script: "CI/ci-linux-test.sh"
+  #image: gitlab.vci.rwth-aachen.de:4567/docker/docker/docker-openmesh-container
+  tags:
+    - Linux
+    - stretch
+    - MultiThreads
+  variables:
+    COMPILER: "gcc"
+    LANGUAGE: "cpp11"
+    BUILD_TYPE: "debug"
+    QTVERSION: "qt6.0.0"
+    IWYU: "no"
+    VECTORCHECKS: "yes"
+  dependencies: [build-debug-gcc-cpp11-qt6.0.0]
+  needs: [build-debug-gcc-cpp11-qt6.0.0]
+  artifacts:
+    reports:
+      junit:
+        - build-gcc-cpp11-qt6.0.0-debug-vectorchecks/Unittests/report.xml
+        - build-gcc-cpp11-qt6.0.0-debug-vectorchecks/Unittests/report-customvec.xml
+        - build-gcc-cpp11-qt6.0.0-debug-vectorchecks/Unittests/report-doublevec.xml
+
+
+#-----------  Job Informations:
+# Type:       Build: release
+# OS:         Linux
+# Compiler:   gcc
+# Language:   cpp11
+# QT Version: qt6.0.0
+
+build-release-gcc-cpp11-qt6.0.0:
+  stage: build
+  script: "CI/ci-linux-build.sh"
+  #image: gitlab.vci.rwth-aachen.de:4567/docker/docker/docker-openmesh-container
+  tags:
+    - Linux
+    - stretch
+  variables:
+    COMPILER: "gcc"
+    LANGUAGE: "cpp11"
+    BUILD_TYPE: "release"
+    QTVERSION: "qt6.0.0"
+    IWYU: "no"
+    VECTORCHECKS: "yes"
+  artifacts:
+    paths:
+    - build-gcc-cpp11-qt6.0.0-release-vectorchecks/
+
+#-----------  Job Informations:
+# Type:       Test: release
+# OS:         Linux
+# Compiler:   gcc
+# Language:   cpp11
+
+test-release-gcc-cpp11-qt6.0.0:
+  stage: test
+  script: "CI/ci-linux-test.sh"
+  #image: gitlab.vci.rwth-aachen.de:4567/docker/docker/docker-openmesh-container
+  tags:
+    - Linux
+    - stretch
+    - MultiThreads
+  variables:
+    COMPILER: "gcc"
+    LANGUAGE: "cpp11"
+    BUILD_TYPE: "release"
+    QTVERSION: "qt6.0.0"
+    IWYU: "no"
+    VECTORCHECKS: "yes"
+  dependencies: [build-release-gcc-cpp11-qt6.0.0]
+  needs: [build-release-gcc-cpp11-qt6.0.0]
+  artifacts:
+    reports:
+      junit:
+        - build-gcc-cpp11-qt6.0.0-release-vectorchecks/Unittests/report.xml
+        - build-gcc-cpp11-qt6.0.0-release-vectorchecks/Unittests/report-customvec.xml
+        - build-gcc-cpp11-qt6.0.0-release-vectorchecks/Unittests/report-doublevec.xml
+
+
+#-----------  Job Informations:
+# Type:       Build: debug
+# OS:         Linux
+# Compiler:   clang
+# Language:   cpp11
+# QT Version: qt6.0.0
+
+build-debug-clang-cpp11-qt6.0.0:
+  stage: build
+  script: "CI/ci-linux-build.sh"
+  #image: gitlab.vci.rwth-aachen.de:4567/docker/docker/docker-openmesh-container
+  tags:
+    - Linux
+    - stretch
+  variables:
+    COMPILER: "clang"
+    LANGUAGE: "cpp11"
+    BUILD_TYPE: "debug"
+    QTVERSION: "qt6.0.0"
+    IWYU: "no"
+    VECTORCHECKS: "yes"
+  artifacts:
+    paths:
+    - build-clang-cpp11-qt6.0.0-debug-vectorchecks/
+
+#-----------  Job Informations:
+# Type:       Test: debug
+# OS:         Linux
+# Compiler:   clang
+# Language:   cpp11
+
+test-debug-clang-cpp11-qt6.0.0:
+  stage: test
+  script: "CI/ci-linux-test.sh"
+  #image: gitlab.vci.rwth-aachen.de:4567/docker/docker/docker-openmesh-container
+  tags:
+    - Linux
+    - stretch
+    - MultiThreads
+  variables:
+    COMPILER: "clang"
+    LANGUAGE: "cpp11"
+    BUILD_TYPE: "debug"
+    QTVERSION: "qt6.0.0"
+    IWYU: "no"
+    VECTORCHECKS: "yes"
+  dependencies: [build-debug-clang-cpp11-qt6.0.0]
+  needs: [build-debug-clang-cpp11-qt6.0.0]
+  artifacts:
+    reports:
+      junit:
+        - build-clang-cpp11-qt6.0.0-debug-vectorchecks/Unittests/report.xml
+        - build-clang-cpp11-qt6.0.0-debug-vectorchecks/Unittests/report-customvec.xml
+        - build-clang-cpp11-qt6.0.0-debug-vectorchecks/Unittests/report-doublevec.xml
+
+
+#-----------  Job Informations:
+# Type:       Build: release
+# OS:         Linux
+# Compiler:   clang
+# Language:   cpp11
+# QT Version: qt6.0.0
+
+build-release-clang-cpp11-qt6.0.0:
+  stage: build
+  script: "CI/ci-linux-build.sh"
+  #image: gitlab.vci.rwth-aachen.de:4567/docker/docker/docker-openmesh-container
+  tags:
+    - Linux
+    - stretch
+  variables:
+    COMPILER: "clang"
+    LANGUAGE: "cpp11"
+    BUILD_TYPE: "release"
+    QTVERSION: "qt6.0.0"
+    IWYU: "no"
+    VECTORCHECKS: "yes"
+  artifacts:
+    paths:
+    - build-clang-cpp11-qt6.0.0-release-vectorchecks/
+
+#-----------  Job Informations:
+# Type:       Test: release
+# OS:         Linux
+# Compiler:   clang
+# Language:   cpp11
+
+test-release-clang-cpp11-qt6.0.0:
+  stage: test
+  script: "CI/ci-linux-test.sh"
+  #image: gitlab.vci.rwth-aachen.de:4567/docker/docker/docker-openmesh-container
+  tags:
+    - Linux
+    - stretch
+    - MultiThreads
+  variables:
+    COMPILER: "clang"
+    LANGUAGE: "cpp11"
+    BUILD_TYPE: "release"
+    QTVERSION: "qt6.0.0"
+    IWYU: "no"
+    VECTORCHECKS: "yes"
+  dependencies: [build-release-clang-cpp11-qt6.0.0]
+  needs: [build-release-clang-cpp11-qt6.0.0]
+  artifacts:
+    reports:
+      junit:
+        - build-clang-cpp11-qt6.0.0-release-vectorchecks/Unittests/report.xml
+        - build-clang-cpp11-qt6.0.0-release-vectorchecks/Unittests/report-customvec.xml
+        - build-clang-cpp11-qt6.0.0-release-vectorchecks/Unittests/report-doublevec.xml
+
+
+
 #-----------  Job Informations:
 # Type:       Build: debug
 # OS:         Linux
@@ -638,7 +863,7 @@ build-VS2019-x64-shared-TRUE-apps:
   script: "CI\\Windows.bat"
   tags:
     - VS2019
-    - Qt5150
+    - Qt612
   artifacts:
     paths:
       - build-release/*.exe
@@ -666,7 +891,7 @@ build-VS2019-x64-shared-FALSE-apps:
   script: "CI\\Windows.bat"
   tags:
     - VS2019
-    - Qt5150
+    - Qt612
   artifacts:
     paths:
       - build-release/*.exe

CI/Windows.bat

@@ -25,12 +25,12 @@ IF "%BUILD_PLATFORM%" == "VS2015" (
 
     IF "%ARCHITECTURE%" == "x64" (
       set QT_INSTALL_PATH=E:\Qt\Qt5.6.0-vs2015-%STRING_ARCH%\5.6\msvc2015_64
-      set QT_BASE_CONFIG=-DQT_INSTALL_PATH=E:\Qt\Qt5.6.0-vs2015-%STRING_ARCH%\5.6\msvc2015_64
+      set QT_BASE_CONFIG=-DQT_INSTALL_PATH=E:\Qt\Qt5.6.0-vs2015-%STRING_ARCH%\5.6\msvc2015_64 -DQT_VERSION=5
     )
 
     IF "%ARCHITECTURE%" == "x32" (
       set QT_INSTALL_PATH=E:\Qt\Qt5.6.0-vs2015-%STRING_ARCH%\5.6\msvc2015
-      set QT_BASE_CONFIG=-DQT_INSTALL_PATH=E:\Qt\Qt5.6.0-vs2015-%STRING_ARCH%\5.6\msvc2015
+      set QT_BASE_CONFIG=-DQT_INSTALL_PATH=E:\Qt\Qt5.6.0-vs2015-%STRING_ARCH%\5.6\msvc2015 -DQT_VERSION=5
     )
 
 ) 
@@ -43,7 +43,7 @@ IF "%BUILD_PLATFORM%" == "VS2017" (
 
     IF "%ARCHITECTURE%" == "x64" (
       set QT_INSTALL_PATH=E:\Qt\Qt5.10.1\5.10.1\msvc2017_64
-      set QT_BASE_CONFIG=-DQT_INSTALL_PATH=E:\Qt\Qt5.10.1\5.10.1\msvc2017_64
+      set QT_BASE_CONFIG=-DQT_INSTALL_PATH=E:\Qt\Qt5.10.1\5.10.1\msvc2017_64 -DQT_VERSION=5
     )
 
 ) 
@@ -56,8 +56,8 @@ IF "%BUILD_PLATFORM%" == "VS2019" (
     set VS_PATH="C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\Common7\IDE\devenv.com"
 
     IF "%ARCHITECTURE%" == "x64" (
-      set QT_INSTALL_PATH=E:\Qt\5.15.2\msvc2019_64
-      set QT_BASE_CONFIG=-DQT_INSTALL_PATH=E:\Qt\5.15.2\msvc2019_64
+      set QT_INSTALL_PATH=E:\Qt\6.1.2\msvc2019_64
+      set QT_BASE_CONFIG=-DQT_INSTALL_PATH=E:\Qt\6.1.2\msvc2019_64 -DQT_VERSION=6
     )
 
 )

CI/ci-linux-prepare.sh

@@ -8,7 +8,12 @@ MAKE_OPTIONS=""
 BUILDPATH=""
 
 # set GTEST path
-OPTIONS="-DGTEST_ROOT=~/sw/gtest-1.10.0"
+if [ -d "$HOME/sw/gtest-1.10.0" ]; then
+  OPTIONS="-DGTEST_ROOT=$HOME/sw/gtest-1.10.0"
+  export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$HOME/sw/gtest-1.10.0/lib"
+else
+  OPTIONS="-DGTEST_ROOT=/usr/src/gtest/"
+fi
 
 if [ "$COMPILER" == "gcc" ]; then
   echo "Building with GCC";
@@ -42,27 +47,35 @@ fi
 if [ "$QTVERSION" == "qt5.13.0" ]; then
   echo "Using QT5.13.0";
   BUILDPATH="$BUILDPATH-qt5.13.0"
-  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.13.0/gcc_64"
+  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.13.0/gcc_64 -DQT_VERSION=5"
 elif [ "$QTVERSION" == "qt5.12.2" ]; then
   echo "Using QT5.12.2";
   BUILDPATH="$BUILDPATH-qt5.12.2"
-  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.12.2/gcc_64"
+  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.12.2/gcc_64 -DQT_VERSION=5"
 elif [ "$QTVERSION" == "qt5.11.2" ]; then
   echo "Using QT5.11.2";
   BUILDPATH="$BUILDPATH-qt5.11.2"
-  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.11.2/gcc_64"
+  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.11.2/gcc_64 -DQT_VERSION=5"
 elif [ "$QTVERSION" == "qt5.9.0" ]; then
   echo "Using QT5.9.0";
   BUILDPATH="$BUILDPATH-qt5.9.0"
-  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.9/gcc_64"
+  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.9/gcc_64 -DQT_VERSION=5"
 elif [ "$QTVERSION" == "qt5.13.2" ]; then
   echo "Using QT5.13.2";
   BUILDPATH="$BUILDPATH-qt5.13.2"
-  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.13.2/gcc_64"
+  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.13.2/gcc_64 -DQT_VERSION=5"
 elif [ "$QTVERSION" == "qt5.15.1" ]; then
   echo "Using QT5.15.1";
   BUILDPATH="$BUILDPATH-qt5.15.1"
-  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.15.1/gcc_64"
+  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/5.15.1/gcc_64 -DQT_VERSION=5"
+elif [ "$QTVERSION" == "qt6.0.0" ]; then
+  echo "Using QT6.0.0";
+  BUILDPATH="$BUILDPATH-qt6.0.0"
+  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/6.0.0/gcc_64 -DQT_VERSION=6"
+elif [ "$QTVERSION" == "qt6.0.3" ]; then
+  echo "Using QT6.0.3";
+  BUILDPATH="$BUILDPATH-qt6.0.3"
+  OPTIONS="$OPTIONS -DQT_INSTALL_PATH=~/sw/Qt/6.0.3/gcc_64 -DQT_VERSION=6"
 fi
 
 #=====================================

CI/gitlab-ci/assemble-gitlab-ci.py

@@ -2,7 +2,7 @@
 
 import sys, os, re, yaml, hashlib
 
-# Version 3.2
+# Version 3.3
 
 # Script for automated gitlab-ci creation
 # Assembles the gitlab ci from master template file:
@@ -76,7 +76,7 @@ def fetchVariableReplacers(variablesGrep):
 
         if (key != None and value != None):
             key = key.strip()
-            result[key] = value
+            result[key] = value.strip()
 
     return result
 
@@ -174,3 +174,4 @@ def main():
 # Execute main function
 if __name__ == '__main__':
     main()
+

CI/gitlab-ci/linux.yml

@@ -12,6 +12,9 @@ cppcheck:
     paths:
       - cppcheck.log
 
+{linux-template-job.yml, COMPILER=gcc, LANGUAGE=cpp11, QT_VERSION=qt6.0.0}
+{linux-template-job.yml, COMPILER=clang, LANGUAGE=cpp11, QT_VERSION=qt6.0.0}
+
 {linux-template-job.yml, COMPILER=gcc, LANGUAGE=cpp11, QT_VERSION=qt5.15.1}
 {linux-template-job.yml, COMPILER=clang, LANGUAGE=cpp11, QT_VERSION=qt5.15.1}
 {linux-template-job.yml, COMPILER=gcc, LANGUAGE=cpp14, QT_VERSION=qt5.15.1}

CI/gitlab-ci/windows.yml

@@ -2,8 +2,8 @@
 # Windows tasks
 # -----------------
 
-{windows-template-job-apps.yml, ARCHITECTURE=x64, SHARED=TRUE, VSVERSION=VS2019, QTTAG=Qt5150}
-{windows-template-job-apps.yml, ARCHITECTURE=x64, SHARED=FALSE, VSVERSION=VS2019, QTTAG=Qt5150}
+{windows-template-job-apps.yml, ARCHITECTURE=x64, SHARED=TRUE, VSVERSION=VS2019, QTTAG=Qt612}
+{windows-template-job-apps.yml, ARCHITECTURE=x64, SHARED=FALSE, VSVERSION=VS2019, QTTAG=Qt612}
 
 {windows-template-job-apps.yml, ARCHITECTURE=x64, SHARED=TRUE, VSVERSION=VS2017, QTTAG=Qt5101}
 {windows-template-job-apps.yml, ARCHITECTURE=x64, SHARED=FALSE, VSVERSION=VS2017, QTTAG=Qt5101}

CMakeLists.txt

@@ -170,7 +170,9 @@ if(${CMAKE_PROJECT_NAME} MATCHES "OpenMesh")
        "${CMAKE_BINARY_DIR}/fixbundle.cmake" @ONLY IMMEDIATE)
 
     # let bundle generation depend on all targets
+    if (QT_FOUND)
         add_dependencies (fixbundle DecimaterGui ProgViewer QtViewer SubdividerGui)
+    endif()
 
     # Required for Snow leopard, and the latest qt. Then the resources have to be copied
     if ( EXISTS "/opt/local/libexec/qt4-mac/lib/QtGui.framework/Versions/4/Resources/qt_menu.nib" )

src/OpenMesh/Apps/CMakeLists.txt

@@ -41,12 +41,15 @@ if ( BUILD_APPS )
     find_package (OpenGL)
 
     # For the apps, we need qt and opengl to build them
-    if (NOT QT5_FOUND)
-      set(QT5_REQUIRED_PACKAGES
-        Qt5Core
-        Qt5Widgets
-        Qt5OpenGL
-        Qt5Gui
+    if (NOT QT_FOUND)
+      set(QT_REQUIRED_PACKAGES
+        Core
+        Widgets
+        OpenGL
+        Gui
+        )
+      set(QT6_REQUIRED_PACKAGES
+        OpenGLWidgets
         )
       vci_qt ()
       set(CMAKE_AUTOMOC ON)
@@ -57,7 +60,7 @@ if ( BUILD_APPS )
     endif()
 
     # check for OpenGL as our required dependencies
-    if (( QT5_FOUND ) AND OPENGL_FOUND AND NOT "${CMAKE_GENERATOR}" MATCHES "MinGW Makefiles" )
+    if (( QT_FOUND ) AND OPENGL_FOUND AND NOT "${CMAKE_GENERATOR}" MATCHES "MinGW Makefiles" )
 
       add_subdirectory (Decimating/DecimaterGui)
       add_subdirectory (QtViewer)
@@ -95,8 +98,8 @@ if ( BUILD_APPS )
 
     else () # QT ,Opengl or glut not found
       
-      if (NOT QT5_FOUND)
-	    message ("QT5 not found! Skipping some apps.")
+      if (NOT QT_FOUND)
+	    message ("QT not found! Skipping some apps.")
       endif ()
 
       if (NOT OPENGL_FOUND)

src/OpenMesh/Apps/Decimating/DecimaterGui/CMakeLists.txt

@@ -29,7 +29,13 @@ endif ()
 target_link_libraries (DecimaterGui
   OpenMeshCore
   OpenMeshTools
-  Qt5::OpenGL
+  ${QT_TARGET}::OpenGL
+  ${QT_TARGET}::Widgets
+  ${QT_TARGET}::Gui
   ${OPENGL_LIBRARIES}
 )
 
+if (QT_VERSION_MAJOR GREATER 5)
+  target_link_libraries (DecimaterGui ${QT_TARGET}::OpenGLWidgets)
+endif()
+

src/OpenMesh/Apps/Decimating/decimaterviewer.cc

@@ -50,6 +50,7 @@
 #include <OpenMesh/Tools/Utils/getopt.h>
 #include <qapplication.h>
 #include <qmessagebox.h>
+#include <QOpenGLContext>
 
 #include "DecimaterViewerWidget.hh"
 
@@ -65,7 +66,11 @@ int main(int argc, char **argv)
   // OpenGL check
   QApplication app(argc,argv);
 
+#if QT_VERSION_MAJOR < 6
   if ( !QGLFormat::hasOpenGL() ) {
+#else
+  if ( QOpenGLContext::openGLModuleType() != QOpenGLContext::LibGL ) {
+#endif
     QString msg = "System has no OpenGL support!";
     QMessageBox::critical( nullptr, "OpenGL", msg + argv[1] );
     return -1;

src/OpenMesh/Apps/ProgViewer/CMakeLists.txt

@@ -28,7 +28,13 @@ endif ()
 target_link_libraries ( ProgViewer
   OpenMeshCore
   OpenMeshTools
-  Qt5::OpenGL
+  ${QT_TARGET}::OpenGL
+  ${QT_TARGET}::Widgets
+  ${QT_TARGET}::Gui
   ${OPENGL_LIBRARIES}
 )
 
+if (QT_VERSION_MAJOR GREATER 5)
+  target_link_libraries (ProgViewer ${QT_TARGET}::OpenGLWidgets)
+endif()
+

src/OpenMesh/Apps/ProgViewer/progviewer.cc

@@ -51,15 +51,20 @@
 #include <OpenMesh/Apps/ProgViewer/ProgViewerWidget.hh>
 #include <QString>
 #include <QApplication>
-#include <QGLWidget>
-
+#if QT_VERSION_MAJOR > 5
+#include <QOpenGLContext>
+#endif
 
 int main(int argc, char **argv)
 {
   // OpenGL check
   QApplication app(argc,argv);
 
+#if QT_VERSION_MAJOR < 6
   if ( !QGLFormat::hasOpenGL() ) {
+#else
+  if ( QOpenGLContext::openGLModuleType() != QOpenGLContext::LibGL ) {
+#endif
     std::cerr << "This system has no OpenGL support.\n";
     return -1;
   }

src/OpenMesh/Apps/QtViewer/CMakeLists.txt

@@ -30,7 +30,13 @@ endif ()
 target_link_libraries (QtViewer
   OpenMeshCore
   OpenMeshTools
-  Qt5::OpenGL
+  ${QT_TARGET}::OpenGL
+  ${QT_TARGET}::Widgets
+  ${QT_TARGET}::Gui
   ${OPENGL_LIBRARIES}
 )
 
+if (QT_VERSION_MAJOR GREATER 5)
+  target_link_libraries (QtViewer ${QT_TARGET}::OpenGLWidgets)
+endif()
+

src/OpenMesh/Apps/QtViewer/MeshViewerWidgetT_impl.hh

@@ -233,7 +233,7 @@ bool MeshViewerWidgetT<M>::set_texture( QImage& _texsrc )
     _texsrc = _texsrc.scaled( tex_w, tex_h, Qt::IgnoreAspectRatio, Qt::SmoothTransformation );
   }
 
-  QImage texture( QGLWidget::convertToGLFormat ( _texsrc ) );
+  QImage texture = _texsrc.convertToFormat(QImage::Format_ARGB32).rgbSwapped();
   
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
   glPixelStorei(GL_UNPACK_SKIP_ROWS,   0);

src/OpenMesh/Apps/QtViewer/QGLViewerWidget.cc

@@ -60,6 +60,7 @@
 #include <QImage>
 #include <QDateTime>
 #include <QMouseEvent>
+#include <QActionGroup>
 // --------------------
 #include <OpenMesh/Apps/QtViewer/QGLViewerWidget.hh>
 #include <OpenMesh/Tools/Utils/Timer.hh>
@@ -68,6 +69,10 @@
 #  define M_PI 3.1415926535897932
 #endif
 
+#if QT_VERSION_MAJOR > 5
+#define swapBuffers()
+#endif
+
 const double TRACKBALL_RADIUS = 0.6;
 
 
@@ -81,21 +86,22 @@ std::string QGLViewerWidget::nomode_ = "";
 
 //----------------------------------------------------------------------------
 
-QGLViewerWidget::QGLViewerWidget( QWidget* _parent )
-  : QGLWidget( _parent )
+#if QT_VERSION_MAJOR < 6
+QGLViewerWidget::QGLViewerWidget( QWidget* _parent ) : QGLWidget( _parent )
+#else
+QGLViewerWidget::QGLViewerWidget( QWidget* _parent ) : QOpenGLWidget( _parent )
+#endif
 {    
   init();
 }
 
-//----------------------------------------------------------------------------
+//---------------------------------------------------------------------------
 
-QGLViewerWidget::
-QGLViewerWidget( QGLFormat& _fmt, QWidget* _parent )
-  : QGLWidget( _fmt, _parent )
-{
-  init();
+#if QT_VERSION_MAJOR > 5
+void QGLViewerWidget::updateGL() {
+    update();
 }
-
+#endif
 
 //----------------------------------------------------------------------------
 
@@ -330,7 +336,7 @@ QGLViewerWidget::mouseMoveEvent( QMouseEvent* _event )
 
   
   // move in z direction
-  if ( (_event->buttons() == (LeftButton+MidButton)) ||
+  if ( (_event->buttons() == (LeftButton|MiddleButton)) ||
 	  (_event->buttons() == LeftButton && _event->modifiers() == ControlModifier))
   {
     float value_y = radius_ * dy * 3.0 / h;
@@ -339,7 +345,7 @@ QGLViewerWidget::mouseMoveEvent( QMouseEvent* _event )
 	
 
   // move in x,y direction
-  else if ( (_event->buttons() == MidButton) ||
+  else if ( (_event->buttons() == MiddleButton) ||
 			(_event->buttons() == LeftButton && _event->modifiers() == AltModifier) )
   {
     float z = - (modelview_matrix_[ 2]*center_[0] + 
@@ -417,7 +423,7 @@ void QGLViewerWidget::wheelEvent(QWheelEvent* _event)
 {
   // Use the mouse wheel to zoom in/out
 
-  float d = -(float)_event->delta() / 120.0 * 0.2 * radius_;
+  float d = -(float)( _event->angleDelta().y() / 120.0 * 0.2 * radius_ );
   translate(Vec3f(0.0, 0.0, d));
   updateGL();
   _event->accept();

src/OpenMesh/Apps/QtViewer/QGLViewerWidget.hh

@@ -47,14 +47,15 @@
 
 
 //== INCLUDES =================================================================
-
-
 #include <OpenMesh/Core/Geometry/VectorT.hh>
-#include <QGLWidget>
 #include <string>
 #include <vector>
 #include <map>
-
+#if QT_VERSION_MAJOR < 6
+    #include <QGLWidget>
+#else
+    #include <QtOpenGLWidgets/QOpenGLWidget>
+#endif
 
 //== FORWARD DECLARATIONS =====================================================
 
@@ -64,21 +65,25 @@ class QAction;
 
 //== CLASS DEFINITION =========================================================
 
-  
+#if QT_VERSION_MAJOR < 6
 class QGLViewerWidget : public QGLWidget
+#else
+class QGLViewerWidget : public QOpenGLWidget
+#endif
 {
-
   Q_OBJECT
 
+  
 public:
+  #if QT_VERSION_MAJOR < 6
   typedef QGLWidget Super;
+  #else
+  typedef QOpenGLWidget Super;
+  #endif
    
   // Default constructor.
   explicit QGLViewerWidget( QWidget* _parent=0 );
 
-  // 
-  QGLViewerWidget( QGLFormat& _fmt, QWidget* _parent=0 );
-
   // Destructor.
   virtual ~QGLViewerWidget();
 
@@ -88,6 +93,11 @@ private:
 
 public:
 
+#if QT_VERSION_MAJOR > 5
+  /* Updates the gui - used to provide backwards compability */
+  void updateGL();
+#endif
+
   /* Sets the center and size of the whole scene. 
      The _center is used as fixpoint for rotations and for adjusting
      the camera/viewer (see view_all()). */

src/OpenMesh/Apps/QtViewer/meshviewer.cc

@@ -44,12 +44,16 @@
 #endif
 
 #include <iostream>
+
 #include <fstream>
 #include <QApplication>
 #include <QMessageBox>
 #include <QMainWindow>
 #include <QMenuBar>
 #include <QFileDialog>
+#if QT_VERSION_MAJOR > 5
+#include <QOpenGLContext>
+#endif
 
 #include "MeshViewerWidget.hh"
 
@@ -62,7 +66,11 @@ int main(int argc, char **argv)
   // OpenGL check
   QApplication app(argc,argv);
 
+#if QT_VERSION_MAJOR < 6
     if ( !QGLFormat::hasOpenGL() ) {
+#else
+    if ( QOpenGLContext::openGLModuleType() != QOpenGLContext::LibGL ) {
+#endif
     QString msg = "System has no OpenGL support!";
     QMessageBox::critical( nullptr, QString("OpenGL"), msg + QString(argv[1]) );
     return -1;

src/OpenMesh/Apps/Subdivider/SubdividerGui/CMakeLists.txt

@@ -28,7 +28,12 @@ endif ()
 target_link_libraries (SubdividerGui
   OpenMeshCore
   OpenMeshTools
-  Qt5::OpenGL
+  ${QT_TARGET}::OpenGL
+  ${QT_TARGET}::Widgets
+  ${QT_TARGET}::Gui
   ${OPENGL_LIBRARIES}
 )
 
+if (QT_VERSION_MAJOR GREATER 5)
+  target_link_libraries (SubdividerGui ${QT_TARGET}::OpenGLWidgets)
+endif()

src/OpenMesh/Apps/Subdivider/qtsubdivider.cc

@@ -51,13 +51,20 @@
 #include <QApplication>
 #include <QMessageBox>
 #include "SubdivideWidget.hh"
+#if QT_VERSION_MAJOR > 5
+#include <QOpenGLContext>
+#endif
 
 int main(int argc, char **argv)
 {
   // OpenGL check
   QApplication app(argc,argv);
 
+#if QT_VERSION_MAJOR < 6
   if ( !QGLFormat::hasOpenGL() ) {
+#else
+  if ( QOpenGLContext::openGLModuleType() != QOpenGLContext::LibGL ) {
+#endif
     QString msg = "System has no OpenGL support!";
     QMessageBox::critical( nullptr, "OpenGL", msg + argv[1], QMessageBox::Ok );
     return -1;

src/OpenMesh/Apps/VDProgMesh/Synthesizer/CMakeLists.txt

@@ -25,6 +25,12 @@ endif ()
 target_link_libraries (Synthesizer
   OpenMeshCore
   OpenMeshTools
-  Qt5::OpenGL
+  ${QT_TARGET}::OpenGL
+  ${QT_TARGET}::Widgets
+  ${QT_TARGET}::Gui
   ${OPENGL_LIBRARIES}
 )
+
+if (QT_VERSION_MAJOR GREATER 5)
+  target_link_libraries (Synthesizer ${QT_TARGET}::OpenGLWidgets)
+endif()

src/OpenMesh/Apps/VDProgMesh/Synthesizer/vdpmsynthesizer.cc

@@ -49,6 +49,9 @@
 
 #include <QString>
 #include <QApplication>
+#if QT_VERSION_MAJOR > 5
+#include <QOpenGLContext>
+#endif
 
 #include "VDPMSynthesizerViewerWidget.hh"
 
@@ -58,7 +61,11 @@ int main(int argc, char **argv)
   QApplication app(argc,argv);
 
 
+#if QT_VERSION_MAJOR < 6
   if ( !QGLFormat::hasOpenGL() ) {
+#else
+  if ( QOpenGLContext::openGLModuleType() != QOpenGLContext::LibGL ) {
+#endif
     std::cerr << "This system has no OpenGL support.\n";
     return 1;
   }