title: OpenGL + Qt using CMake
body: <p>I have a <code>Qt</code> project created with a <code>*.pro</code> file that I need to migrate it to a <code>CMakeLists</code>. This project uses a simple <code>OpenGL</code> animation to show a 3D model of a hand. I already change it to use <code>CMake</code>, but I encounter 2 problems. (The program compiles but it doesn't run properly)</p>
  
  <ol>
  <li>The memory consumption of the program passes from being 20-50MB using the <code>*.pro</code> file, to 1.3GB using <code>CMake</code> (Maybe some library being loaded completely or something??)</li>
  <li>The program runs incredibly slow (like 1 frame every 5-10 seconds) in contrast with the speed from using the <code>*.pro</code> file (approx. 3 frames per second)</li>
  </ol>
  
  <p>The question is, what I am doing wrong and how can I fix it?</p>
  
  <p>Here is the <code>*.pro</code> file:</p>
  
  <pre><code>QT += core gui opengl
  
  TARGET   = RGBD_3D_Viewer
  TEMPLATE = app
  
  
  SOURCES +=  main.cpp\
              mainwindow.cpp \
              glwidget.cpp \
              glwidget_Camera.cpp \
              glwidget_Comm.cpp \
              glwidget_Extractors.cpp \
              glwidget_Rendering.cpp \
              glwidget_Video.cpp \
              glwidget_UI_Mouse.cpp \
              glwidget_OpenGL.cpp \
              mainwindow_Comm.cpp \
              mainwindow_GUI.cpp \
              model.cpp \
              cameraSet.cpp \
              model_Mesh.cpp \
              model_Skeleton.cpp \
              model_Skin.cpp \
              model_Extra_SkinningStuff.cpp \
              animation.cpp \
              animation_Transform.cpp \
              videoSequence.cpp \
              sequence.cpp \
              mainwindow_UI_Keyboard_Mouse.cpp \
              tracker.cpp \
              mainwindow_FrameNumber.cpp \
              model_Limits.cpp \
              animation_Files_CompleteSequence.cpp \
              mainwindow_MODELS_INFO.cpp \
              modelSET.cpp \
              animation_0_RotAxes_Limits.cpp \
              myMATH.cpp \
              types_Background.cpp \
              model_Extra_VOI.cpp \
              fingertipSet.cpp \
              tracker_OnIndexChange.cpp \
              tracker_wFeatureSet.cpp
  
  HEADERS  += mainwindow.h \
              glwidget.h \
              model.h \
              cameraSet.h \
              animation.h \
              videoSequence.h \
              sequence.h \
              tracker.h \
              mymath.h \
              modelSET.h \
              ui_mainwindow.h \
              featureSet.h \
              typesBackground.h \
              fingertipSet.h
  
  FORMS    += mainwindow.ui
  
  
  
  INCLUDEPATH += /usr/include/eigen3/
  
  INCLUDEPATH += /home/cvg11/projects/development/RGBD_3D_Viewer/glm
  
  
  LIBS += -L/usr/local/lib/
  LIBS += -lopencv_core
  LIBS += -lopencv_highgui
  
  
  QMAKE_CXXFLAGS += -O3
  QMAKE_CXXFLAGS += -frounding-math
  #QMAKE_CXXFLAGS += -std=c++0x
  </code></pre>
  
  <p>Here is the <code>CMakeLists.txt</code> file:</p>
  
  <pre><code>project(3d_viewer)
  cmake_minimum_required(VERSION 2.6 FATAL_ERROR)
  
  include_directories(${CMAKE_CURRENT_BINARY_DIR})
  include_directories( ${PROJECT_SOURCE_DIR}/include ${PROJECT_SOURCE_DIR}/glm)
  
  find_package( PkgConfig )
  pkg_check_modules( EIGEN3 REQUIRED eigen3 )
  include_directories( ${EIGEN3_INCLUDE_DIRS} )
  
  # Opencv required
  find_package(OpenCV COMPONENTS core highgui REQUIRED)
  include_directories(${OPENCV_INCLUDE_DIRS})
  link_directories(${OPENCV_LIBRARY_DIRS})
  add_definitions(${OPENCV_DEFINITIONS})
  
  message("\n\nFound OpenCV\n\n")
  
  
  # QT4 required
  find_package(Qt4 COMPONENTS QtCore QtGui QtOpenGL REQUIRED)
  set(QT_USE_QTOPENGL TRUE)
  include(${QT_USE_FILE})
  add_definitions(${QT_DEFINITIONS})
  
  message("\n\nFound QT4\n\n")
  
  
  INCLUDE_DIRECTORIES(${QT_QTOPENGL_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR} )
  
  #set the default path for built executables to the "bin" directory
  set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
  #set the default path for built libraries to the "lib" directory
  set(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)
  
  
  file(GLOB VIEWER_SOURCES src/*.cpp)
  
  file(GLOB VIEWER_INCLUDES include/*.h)
  
  
  # set QT headers
  SET(QT_HEADERS
      include/mainwindow.h
      include/glwidget.h
      )
  
  #set QT forms
  SET(QT_FORMS
      ui/mainwindow.ui
  )
  
  # create moc for QT
  QT4_WRAP_CPP(QT_MOC ${QT_HEADERS})
  
  # process ui
  QT4_WRAP_UI(QT_FORMS_HEADERS ${QT_FORMS})
  
  ADD_EXECUTABLE(3d_viewer ${VIEWER_SOURCES} ${VIEWER_INCLUDES}
      ${QT_HEADERS}
      ${QT_MOC}
      ${QT_FORMS})
  
  TARGET_LINK_LIBRARIES(3d_viewer ${QT_LIBRARIES} ${OpenCV_LIBS} )
  set_property(TARGET 3d_viewer PROPERTY COMPILE_DEFINITIONS QT_SHARED)
  </code></pre>
  
  <p>EDIT:</p>
  
  <p>Here are the two outputs of <code>make VERBOSE=1</code> (I just show the last link and one of the files since the rest of the files are the same)</p>
  
  <p><code>CMake</code>:</p>
  
  <pre><code>[100%] Building CXX object CMakeFiles/3d_viewer.dir/include/moc_glwidget.cxx.o
  /usr/bin/c++   -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_SHARED -O3 -DNDEBUG -I/home/cvg11/projects/development/RGBD_3D_Viewer/build -I/home/cvg11/projects/development/RGBD_3D_Viewer/include -I/home/cvg11/projects/development/RGBD_3D_Viewer/glm -I/usr/include/eigen3 -I/usr/local/include/opencv -I/usr/local/include -isystem /usr/include/qt4 -isystem /usr/include/qt4/QtOpenGL -isystem /usr/include/qt4/QtGui -isystem /usr/include/qt4/QtCore    -o CMakeFiles/3d_viewer.dir/include/moc_glwidget.cxx.o -c /home/cvg11/projects/development/RGBD_3D_Viewer/build/include/moc_glwidget.cxx
  Linking CXX executable ../bin/3d_viewer
  /usr/local/bin/cmake -E cmake_link_script CMakeFiles/3d_viewer.dir/link.txt --verbose=1
  /usr/bin/c++   -O3 -DNDEBUG    CMakeFiles/3d_viewer.dir/src/mainwindow_FrameNumber.cpp.o CMakeFiles/3d_viewer.dir/src/animation.cpp.o CMakeFiles/3d_viewer.dir/src/glwidget_OpenGL.cpp.o CMakeFiles/3d_viewer.dir/src/main.cpp.o CMakeFiles/3d_viewer.dir/src/mainwindow_Comm.cpp.o CMakeFiles/3d_viewer.dir/src/glwidget_Comm.cpp.o CMakeFiles/3d_viewer.dir/src/myMATH.cpp.o CMakeFiles/3d_viewer.dir/src/model.cpp.o CMakeFiles/3d_viewer.dir/src/glwidget_Rendering.cpp.o CMakeFiles/3d_viewer.dir/src/model_Extra_VOI.cpp.o CMakeFiles/3d_viewer.dir/src/videoSequence.cpp.o CMakeFiles/3d_viewer.dir/src/cameraSet.cpp.o CMakeFiles/3d_viewer.dir/src/model_Extra_SkinningStuff.cpp.o CMakeFiles/3d_viewer.dir/src/mainwindow_MODELS_INFO.cpp.o CMakeFiles/3d_viewer.dir/src/animation_0_RotAxes_Limits.cpp.o CMakeFiles/3d_viewer.dir/src/modelSET.cpp.o CMakeFiles/3d_viewer.dir/src/glwidget_Video.cpp.o CMakeFiles/3d_viewer.dir/src/animation_Transform.cpp.o CMakeFiles/3d_viewer.dir/src/glwidget_Camera.cpp.o CMakeFiles/3d_viewer.dir/src/sequence.cpp.o CMakeFiles/3d_viewer.dir/src/animation_Files_CompleteSequence.cpp.o CMakeFiles/3d_viewer.dir/src/glwidget_UI_Mouse.cpp.o CMakeFiles/3d_viewer.dir/src/model_Skin.cpp.o CMakeFiles/3d_viewer.dir/src/tracker_wFeatureSet.cpp.o CMakeFiles/3d_viewer.dir/src/tracker_OnIndexChange.cpp.o CMakeFiles/3d_viewer.dir/src/mainwindow.cpp.o CMakeFiles/3d_viewer.dir/src/types_Background.cpp.o CMakeFiles/3d_viewer.dir/src/glwidget_Extractors.cpp.o CMakeFiles/3d_viewer.dir/src/model_Limits.cpp.o CMakeFiles/3d_viewer.dir/src/model_Skeleton.cpp.o CMakeFiles/3d_viewer.dir/src/tracker.cpp.o CMakeFiles/3d_viewer.dir/src/model_Mesh.cpp.o CMakeFiles/3d_viewer.dir/src/mainwindow_UI_Keyboard_Mouse.cpp.o CMakeFiles/3d_viewer.dir/src/fingertipSet.cpp.o CMakeFiles/3d_viewer.dir/src/mainwindow_GUI.cpp.o CMakeFiles/3d_viewer.dir/src/glwidget.cpp.o CMakeFiles/3d_viewer.dir/include/moc_mainwindow.cxx.o CMakeFiles/3d_viewer.dir/include/moc_glwidget.cxx.o  -o ../bin/3d_viewer  -L/usr/local/cuda/lib64 -rdynamic -lglut -lXmu -lXi -lQtOpenGL -lQtGui -lQtCore /usr/local/lib/libopencv_core.so.2.4.9 /usr/local/lib/libopencv_highgui.so.2.4.9 /usr/local/lib/libopencv_core.so.2.4.9 -Wl,-rpath,/usr/local/cuda/lib64:/usr/local/lib -Wl,-rpath-link,/usr/local/lib 
  make[2]: Leaving directory `/home/cvg11/projects/development/RGBD_3D_Viewer/build'
  /usr/local/bin/cmake -E cmake_progress_report /home/cvg11/projects/development/RGBD_3D_Viewer/build/CMakeFiles  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
  [100%] Built target 3d_viewer
  </code></pre>
  
  <p><code>*.pro</code> project:</p>
  
  <pre><code>g++ -c -pipe -frounding-math -O3 -O2 -w -D_REENTRANT -DQT_WEBKIT -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4 -I/usr/include/eigen3 -I../../projects/development/RGBD_3D_Viewer/glm -I/usr/X11R6/include -I. -I. -o moc_mainwindow.o moc_mainwindow.cpp
  /usr/bin/moc-qt4 -DQT_WEBKIT -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4 -I/usr/include/eigen3 -I../../projects/development/RGBD_3D_Viewer/glm -I/usr/X11R6/include -I. -I. glwidget.h -o moc_glwidget.cpp
  g++ -c -pipe -frounding-math -O3 -O2 -w -D_REENTRANT -DQT_WEBKIT -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4 -I/usr/include/eigen3 -I../../projects/development/RGBD_3D_Viewer/glm -I/usr/X11R6/include -I. -I. -o moc_glwidget.o moc_glwidget.cpp
  g++ -Wl,-O1 -o RGBD_3D_Viewer main.o mainwindow.o glwidget.o glwidget_Camera.o glwidget_Comm.o glwidget_Extractors.o glwidget_Rendering.o glwidget_Video.o glwidget_UI_Mouse.o glwidget_OpenGL.o mainwindow_Comm.o mainwindow_GUI.o model.o cameraSet.o model_Mesh.o model_Skeleton.o model_Skin.o model_Extra_SkinningStuff.o animation.o animation_Transform.o videoSequence.o sequence.o mainwindow_UI_Keyboard_Mouse.o tracker.o mainwindow_FrameNumber.o model_Limits.o animation_Files_CompleteSequence.o mainwindow_MODELS_INFO.o modelSET.o animation_0_RotAxes_Limits.o myMATH.o types_Background.o model_Extra_VOI.o fingertipSet.o tracker_OnIndexChange.o tracker_wFeatureSet.o moc_mainwindow.o moc_glwidget.o    -L/usr/lib/x86_64-linux-gnu -L/usr/X11R6/lib -L/usr/local/lib/ -lopencv_core -lopencv_highgui -lQtOpenGL -lQtGui -lQtCore -lGL -lpthread 
  </code></pre>
  
  <p>I tried adding/removing the -frounding-math flag without having any appreciable difference...</p>