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Opengl doesn't work with Qt

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  • F Offline
    F Offline
    fery13
    wrote on 27 Jun 2011, 14:30 last edited by
    #6

    Hi Guys sorry for my late reply, here is errors :

    C:\Users\FGHASSEMIT\ne1\ne1.cpp:-1: error: undefined reference to __glutInitWithExit@12' C:\Users\FGHASSEMIT\ne1\ne1.cpp:-1: error: undefined reference to glutInitDisplayMode@4'
    C:\Users\FGHASSEMIT\ne1\ne1.cpp:-1: error: undefined reference to glutInitWindowSize@8' C:\Users\FGHASSEMIT\ne1\ne1.cpp:-1: error: undefined reference to glutInitWindowPosition@8'
    C:\Users\FGHASSEMIT\ne1\ne1.cpp:-1: error: undefined reference to __glutCreateWindowWithExit@8' C:\Users\FGHASSEMIT\ne1\ne1.cpp:-1: error: undefined reference to glutDisplayFunc@4'
    C:\Users\FGHASSEMIT\ne1\ne1.cpp:-1: error: undefined reference to `glutMainLoop@0'
    :-1: error: collect2: ld returned 1 exit status

    and here is my .pro file :

    TARGET = ne1

    TEMPLATE = app

    DEPENDPATH += .

    INCLUDEPATH += .

    SOURCES += ne1.cpp

    HEADERS += ne1.h
    ne1_global.h

    CONFIG += opengl
    release

    QT += opengl

    LIBS += -glut32 -glut


    for "LIBS += " I changed for only -glut but still the same errors come ...
    Looking forward for your solution
    Thanks in advance .

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    • Z Offline
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      ZapB
      wrote on 27 Jun 2011, 14:36 last edited by
      #7

      @
      LIBS += -lglut
      @

      notice the -l. The following .pro file works for me with a simple OpenGL example that uses glut:

      @
      QT += opengl

      TARGET = 06-solar-system
      TEMPLATE = app

      SOURCES += main.cpp
      solarsystem.cpp

      HEADERS += solarsystem.h

      LIBS += -lglut
      @

      Nokia Certified Qt Specialist
      Interested in hearing about Qt related work

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      • F Offline
        F Offline
        fery13
        wrote on 27 Jun 2011, 14:47 last edited by
        #8

        I guess you work with linux, I used this command as well then I have error that says can not find lglut, one of my colleague work with linux and uses LIBS += -lglut and he can work but for me it doenst work since I am using windows 7 ....
        :(

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        • Z Offline
          Z Offline
          ZapB
          wrote on 27 Jun 2011, 14:53 last edited by
          #9

          True. I'll try it on windows tonight.

          Nokia Certified Qt Specialist
          Interested in hearing about Qt related work

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          • F Offline
            F Offline
            fery13
            wrote on 27 Jun 2011, 14:58 last edited by
            #10

            oh many many thanks ... I am eagerly looking forward to hear good news from you ...... :)

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            • L Offline
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              ludde
              wrote on 27 Jun 2011, 17:27 last edited by
              #11

              If you really want ot use GLUT, I think you'll have to find a Windows port of GLUT, and install it, e.g. "this one":http://www.xmission.com/~nate/glut.html. Then, you must add the library, as well as the path to where you installed it, to the LIBS variable. And possible set the include path as well.

              But, most of the things you get from using GLUT are things you don't really need when you use OpenGL with Qt. It makes sense to use GLUT or Qt, but not really both.

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              • F Offline
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                fery13
                wrote on 27 Jun 2011, 17:35 last edited by
                #12

                Is it something different with the glut which I am currently using in c++ under the same windows ??? because in c++ I have no problem with openGl and all its library only in Qt ...

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                • L Offline
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                  ludde
                  wrote on 27 Jun 2011, 17:44 last edited by
                  #13

                  You are saying that you can use GLUT from plain C++ code, but not from Qt code? In that case you must have it installed somewhere already. You just need to tell where, in your .pro file, so that qmake can find it. I.e., you must add something like:
                  @
                  LIBS += -lglut
                  LIBS += -LC:/location/of/glut
                  @
                  I'm not sure this is what's missing, though. Since you don't get an error saying it cannot find the glut library. Looks like it actually finds it, but not the symbols it needs. Strange.

                  Which compiler are you using? The same one you use when compiling plain C++ code?

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                  • F Offline
                    F Offline
                    fery13
                    wrote on 27 Jun 2011, 17:53 last edited by
                    #14

                    Yes I am using in plain C++ without problem,
                    But I can not find any file like lglut in my pc(where can I get this file) ??????
                    I have only glut, glut32 (header file and lib file )....
                    but I never tried the second line which you mentioned above, I will try the second one seems by the second line error should be gone hopefully by the way now I uninstall the Qt and trying to get the new version as soon as I install I will apply this and I will let you know about it .... many many thanks to you that spend your time for my problem .....

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                    • U Offline
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                      ucomesdag
                      wrote on 27 Jun 2011, 18:03 last edited by
                      #15

                      -l stands for library and -L for library path, see "qmake doc":http://doc.qt.nokia.com/4.7/qmake-variable-reference.html#libs
                      [quote author="fery13" date="1309197219"]Yes I am using in plain C++ without problem,
                      But I can not find any file like lglut in my pc(where can I get this file) ??????
                      I have only glut, glut32 (header file and lib file ).... [/quote]

                      Write “Qt”, not “QT” (QuickTime).

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                      • L Offline
                        L Offline
                        ludde
                        wrote on 27 Jun 2011, 18:08 last edited by
                        #16

                        -lglut is like a command line option, which you use to tell qmake to use a library. -l is the option and glut the argument. On Windows, the file should be called glut.lib. -L is used to add a directory in which to look for libraries.

                        I don't think this is the problem, though. It seems to find GLUT and is unable to link with it. Maybe you simply cannot do this, because using those functions mentioned above together with Qt really makes no sense.

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                        • U Offline
                          U Offline
                          ucomesdag
                          wrote on 27 Jun 2011, 18:27 last edited by
                          #17

                          Try @LIBS += -L/path/to/your/lib -lLibfile_without_exstension@

                          Write “Qt”, not “QT” (QuickTime).

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                          • L Offline
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                            ludde
                            wrote on 27 Jun 2011, 19:08 last edited by
                            #18

                            Just had a look in my OpenGL installation, which is the one that comes with mingw / Qt Creator, and it contains glu, but not glut. So your glut must come from somewhere else.

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                            • F Offline
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                              fery13
                              wrote on 28 Jun 2011, 12:02 last edited by
                              #19

                              That's strange I tried all, but still errors, also I re install Qt ... here is my .pro:
                              @
                              #-------------------------------------------------

                              Project created by QtCreator 2011-06-23T18:42:17

                              #-------------------------------------------------

                              TARGET = open1

                              TEMPLATE = app

                              DEPENDPATH += .

                              INCLUDEPATH += .

                              SOURCES += open1.cpp

                              HEADERS += open1.h
                              open1_global.h

                              CONFIG += opengl
                              release

                              QT += opengl

                              LIBS += -lglut
                              LIBS += C:\Users\FGHASSEMIT\Documents\qt\GL\glut.lib
                              @
                              and here errors :

                              :-1: error: cannot find -lglut
                              :-1: error: collect2: ld returned 1 exit status

                              .................
                              this is the same if I write glut32 instead of glut ....
                              :(

                              Edit: Added @ tags

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                              • Z Offline
                                Z Offline
                                ZapB
                                wrote on 28 Jun 2011, 12:07 last edited by
                                #20

                                Try also adding:

                                @
                                LIBS += -LC:/path/to/your/glut/lib
                                @

                                Nokia Certified Qt Specialist
                                Interested in hearing about Qt related work

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                                • F Offline
                                  F Offline
                                  fery13
                                  wrote on 28 Jun 2011, 12:16 last edited by
                                  #21

                                  I did then I have again error :

                                  :-1: error: LC:/Users/FGHASSEMIT/Documents/qt/GL/glut.lib: Invalid argument

                                  I guess LC is used for Linux ....

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                                  • L Offline
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                                    ludde
                                    wrote on 28 Jun 2011, 12:18 last edited by
                                    #22

                                    You are now trying to link with glut twice... Your .pro file should contain
                                    @
                                    LIBS += -lglut
                                    LIBS += -LC:\Users\FGHASSEMIT\Documents\qt\GL
                                    @
                                    or just
                                    @
                                    LIBS += C:\Users\FGHASSEMIT\Documents\qt\GL\glut.lib
                                    @
                                    but not both.

                                    Nevertheless, I think you should try to get rid of the glut dependency, because using it with Qt will most likely create problems.

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                                    • F Offline
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                                      fery13
                                      wrote on 28 Jun 2011, 12:18 last edited by
                                      #23

                                      sorry I forget to put dash (-) behind so the errors turn to be like this :

                                      C:\Users\FGHASSEMIT\open1\open1.cpp:-1: error: undefined reference to __glutInitWithExit' C:\Users\FGHASSEMIT\open1\open1.cpp:-1: error: undefined reference to glutInitDisplayMode'
                                      C:\Users\FGHASSEMIT\open1\open1.cpp:-1: error: undefined reference to glutInitWindowSize' . . . C:\Users\FGHASSEMIT\open1\open1.cpp:-1: error: undefined reference to _imp__glBegin'
                                      C:\Users\FGHASSEMIT\open1\open1.cpp:-1: error: undefined reference to _imp__glVertex2f' C:\Users\FGHASSEMIT\open1\open1.cpp:-1: error: undefined reference to _imp__glEnd'
                                      C:\Users\FGHASSEMIT\open1\open1.cpp:-1: error: undefined reference to `_imp__glFlush'
                                      :-1: error: collect2: ld returned 1 exit status

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                                      • Z Offline
                                        Z Offline
                                        ZapB
                                        wrote on 28 Jun 2011, 12:26 last edited by
                                        #24

                                        I agree with ludde. You are trying to use glut to reproduce functionality that is already in Qt. Some glut functions can still make sense to use within Qt (ie for drawing basic geometric shapes such as a sphere).

                                        Take a look at my repository to see a few very simple OpenGL apps that use Qt rather than glut for the windowing functionality. Just use svn to checkout:

                                        @
                                        https://svn.theharmers.co.uk/svn/codes/public/opengl/trunk/
                                        @

                                        cd into one of the directories e.g. 06-solar-system then run:

                                        @
                                        qmake
                                        make
                                        @

                                        Nokia Certified Qt Specialist
                                        Interested in hearing about Qt related work

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                                        27 Jun 2011, 18:03

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