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OpenGL 3.x Mac Lion

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  • J Offline
    J Offline
    jmacey
    wrote on last edited by
    #3

    Not sure it's a bug as such just a lack of feature for the new version of OpenGL. According to the new version of glview 3.2 is supported but I'm presuming it's just not activated in the current qtgl library as it's so new. I will download the source and drill into the lib to see where the context in the QGLWidget is created and see if I can patch it.

    If anyone knows a good place to start let me know.

    It will be good to be able to convert all my code to
    Glsl 150 as I won't have to support separate shaders for mac vs Linux and windows for next years teaching.

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    • D Offline
      D Offline
      dangelog
      wrote on last edited by
      #4

      src/opengl/qgl_mac.mm sounds like a good place to start :)

      Software Engineer
      KDAB (UK) Ltd., a KDAB Group company

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      • J Offline
        J Offline
        jmacey
        wrote on last edited by
        #5

        cheers, downloading the 4.8 beta for a test then will get the source and have a play

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        • J Offline
          J Offline
          jmacey
          wrote on last edited by
          #6

          it seems that Qt 4.8 Beta gives me the core profile under Lion ;-) however Lion has two drivers (compatibility and core) the compat is 2.0 only so I just need to remove a few deprecated functions from my library first.

          For more details on the Mac GL this is good http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&p=104206#104206

          Thanks for the help

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          • J Offline
            J Offline
            jmacey
            wrote on last edited by
            #7

            spoke too soon, seem I had some legacy Mac code in my initializeGL function, the driver is initialsed and reports 3.2 but the context isn't created to the same so get crashes, oh well. Will download the 4.7 source and hack

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            • M Offline
              M Offline
              mcdi
              wrote on last edited by
              #8

              In case if it is still actual topic. Here is some code, which allows to get opengl 3.2 core without hacking Qt4.7.

              test_ogl_core_context.cpp:
              @
              #include <QApplication>

              #include <QGLWidget>
              #include <QGLContext>

              #include <iostream>

              void* select_3_2_mac_visual(GDHandle handle);

              struct Core3_2_context : public QGLContext
              {
              Core3_2_context(const QGLFormat& format, QPaintDevice* device) : QGLContext(format,device) {}
              Core3_2_context(const QGLFormat& format) : QGLContext(format) {}

              virtual void* chooseMacVisual(GDHandle handle)
              

              {
              return select_3_2_mac_visual(handle);
              }
              };

              struct OglWidget : public QGLWidget
              {
              OglWidget() : QGLWidget(new Core3_2_context(QGLFormat::defaultFormat()))
              {
              }
              virtual void initializeGL()
              {
              std::cout<<glGetString(GL_VERSION)<<std::endl;
              }
              virtual void paintGL()
              {
              glClearColor(0,1,0,1);
              glClear(GL_COLOR_BUFFER_BIT);
              }
              };

              int main(int argc, char *argv[])
              {
              QApplication app(argc,argv);

              OglWidget w;
              w.show();

              return app.exec();
              }
              @

              core_profile_attributes.mm:
              @
              #include <QGLContext>

              void* select_3_2_mac_visual(GDHandle handle)
              {
              static const int Max = 40;
              NSOpenGLPixelFormatAttribute attribs[Max];
              int cnt = 0;

              attribs[cnt++] = NSOpenGLPFAOpenGLProfile;
              attribs[cnt++] = NSOpenGLProfileVersion3_2Core;
              
              attribs[cnt++] = NSOpenGLPFADoubleBuffer;
              
              attribs[cnt++] = NSOpenGLPFADepthSize;
              attribs[cnt++] = (NSOpenGLPixelFormatAttribute)16;
              
              attribs[cnt] = 0;
              Q_ASSERT(cnt < Max);
              
              
              return [[NSOpenGLPixelFormat alloc] initWithAttributes:attribs];
              

              }
              @

              CMakeLists.txt:
              @
              PROJECT(qt4_lion_ogl32)
              cmake_minimum_required(VERSION 2.8)

              FIND_PACKAGE(Qt4)
              SET( QT_USE_QTOPENGL true )
              INCLUDE( ${QT_USE_FILE} )

              FIND_PACKAGE(OpenGL)

              ADD_EXECUTABLE( test_ogl_core_context
              #test_ogl_core_context.cpp
              core_profile_attributes.mm
              )
              TARGET_LINK_LIBRARIES( test_ogl_core_context
              ${QT_LIBRARIES}
              ${OPENGL_LIBRARIES}
              "-framework Foundation"
              "-framework Cocoa"
              )
              @

              Sorry, if it is written not in the best way. I am new for Mac.

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              • J Offline
                J Offline
                jmacey
                wrote on last edited by
                #9

                Thanks will give it a go

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                • J Offline
                  J Offline
                  jmacey
                  wrote on last edited by
                  #10

                  Just to say I've finally got back from Holiday and integrated your code with my own and it works, thanks mcdi really useful. Will write up a full blog report / post soon and add a link here as got basic Qt + OpenGL 3.x and glsl 150 working on the mac

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                  • T Offline
                    T Offline
                    tomato
                    wrote on last edited by
                    #11

                    It worked like a charm, pure "core profile"! Thanks a lot mcdi!
                    For noobs on mac platform, like me, here is the trick for mixing objective-C directly in .pro file :
                    @ mac {
                    OBJECTIVE_SOURCES += core_profile_attributes.mm
                    LIBS += -framework Foundation -framework Cocoa
                    }@
                    "source":http://el-tramo.be/blog/mixing-cocoa-and-qt

                    お前はもう死んでいる

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                    • Z Offline
                      Z Offline
                      ZapB
                      wrote on last edited by
                      #12

                      Not sure about mac as I have no way to test but support for getting an OpenGL Core profile context has been added to 4.8.0 in gitorious. See this "post":http://developer.qt.nokia.com/forums/viewthread/4856/P15/#30548

                      Nokia Certified Qt Specialist
                      Interested in hearing about Qt related work

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                      • M Offline
                        M Offline
                        miketopen
                        wrote on last edited by
                        #13

                        Hi everyone,
                        I tried to create a openGL 3.2 core context on my mac (mountain lion) with qt 4.8.3 and it was not possible....

                        Fortunately, when using the code above it was working! :-) A very helpful thread....

                        The .pro-file is simply for completeness here:

                        opengl3_and_qt.pro
                        @
                        QT += core gui opengl

                        TARGET = opengl3_and_qt
                        TEMPLATE = app

                        SOURCES += test_ogl_core_context.cpp
                        OBJECTIVE_SOURCES += core_profile_attributes.mm
                        LIBS += -framework Foundation -framework Cocoa
                        @

                        Now the question: is there an other and more clean way on the mac with qt to create an opengl 3.2 context??

                        Thanks

                        Mike
                        

                        www.topen.org

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                        • Z Offline
                          Z Offline
                          ZapB
                          wrote on last edited by
                          #14

                          OpenGL 3.2 Core Profile should work out of the box on OS X with Qt5 now.

                          Nokia Certified Qt Specialist
                          Interested in hearing about Qt related work

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                          • M Offline
                            M Offline
                            miketopen
                            wrote on last edited by
                            #15

                            [quote author="ZapB" date="1352755393"]OpenGL 3.2 Core Profile should work out of the box on OS X with Qt5 now.[/quote]

                            I tried to use the core profile on Mountain Lion with Qt 5.0.0, but it seems not to work. Does anyone has an working example (on OSX) with OpenGL 3.2 and Core Profile? All the OpenGL examples shipped with Qt are using OpenGL 2.

                            Thanks in advance

                            Mike

                            p.s. If there is a special git version of Qt I have to use I'm also fine with that.

                            www.topen.org

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                            • M Offline
                              M Offline
                              miketopen
                              wrote on last edited by
                              #16

                              Hi

                              I think I have to restate my sentence about "openGL 3.2 is not working". Actual it is working out of the box, but I used the "wrong" example. I tried it with this "tutorial":http://qt-project.org/wiki/How_to_use_OpenGL_Core_Profile_with_Qt unfortunately for Qt 5 the wrong headers are used, and then it is indeed not work....but this (shame to myself) is also written in the Qt documentation. However, after fixing the headers the simple example was working :-)

                              For the people interested I put the adopted variant "here":https://github.com/mikenicolai/qt5-opengl3-examples

                              Bests

                              Mike
                              

                              www.topen.org

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                              • E Offline
                                E Offline
                                eyetracker
                                wrote on last edited by
                                #17

                                Hi all,

                                I tried the above solution as well as the 07-core-profile from the wiki
                                "here":http://qt-project.org/wiki/How_to_useOpenGL_Core_Profile_with_Qt</a>, but on OS X 10.8.4, Qt 4.8.4 still won't budge out of GL version 2.1 with GLSL version 1.20. Here's the output from the above solution (with most of the shader stuff commented since the compiler was complaining about QOpenGLBuffer which I thought might be specific to Qt 5).

                                The output I get is:

                                Widget OpenGl: 1.0
                                Context valid: 1
                                Really used OpenGl: 1.0
                                OpenGl information: VENDOR: NVIDIA Corporation
                                RENDERDER: NVIDIA Quadro K5000 OpenGL Engine
                                VERSION: 2.1 NVIDIA-8.12.47 310.40.00.05f01
                                GLSL VERSION: 1.20

                                Any ideas what I might be missing? The 07-core-profile wiki entry has a bold comment about some OS X "issues" but I didn't see what those issues were or their resolution.

                                This started with me trying to use textureSize in a shader which should be supported under Mountain Lion (GLView app shows GL version 3.2 along with the Quadro K5000 NVidia driver as identified above).

                                Thanks!

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