I am trying to use raw OpenGL with Qt and I am trying to strictly use the Qt API to do so. I am using OpenGL 2.1 because that is our hardware limitation. I am able to build without any errors but the first instance of a gl* fails. The first opengl function is glGetIntergv(GL_ENUM, int*) and through the debugger I am able to see that is where I crash first. I am just curious if anyone can see what I am missing because my guess is I have to do something special to initialize these functions (which I thought initializeOpenGLFunctions() accomplished). Any help or direction would be great!!

I am subclassing with QOpenGLFunctions_2_1 like so:
Qt Code: 
  1. class GLWidget : public QGLWidget, protected QOpenGLFunctions_2_1
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These are the relevant source file functions
Qt Code: 
  1. GLWidget::GLWidget(QWidget *parent) :
  2.     QGLWidget(QGLFormat(QGL::DoubleBuffer | QGL::Rgba | QGL::DepthBuffer),parent)
  3. {
  4.     createActions();
  5.     createMenus();
  6. }
  7.  
  8. void GLWidget::initializeGL()
  9. {
  10.     initializeOpenGLFunctions();
  11.  
  12.     pixels[0] = pixels[1] = pixels[2] = NULL;
  13.     frameGood[0] = frameGood[1] = frameGood[2] = GL_FALSE;
  14.  
  15.     qDebug() << "Pixel Buffer Object Demo";
  16.  
  17.     QGLFunctions funcs(QGLContext::currentContext());
  18.     bool isNonPowerTwo = funcs.hasOpenGLFeature(QGLFunctions::NPOTTextures);
  19.  
  20. //    // Make sure required functionality is available!
  21. //    if (!GLEE_VERSION_2_1 && !GLEE_ARB_pixel_buffer_object)
  22. //    {
  23. //        qDebug() << "PBO extension is not available!";
  24. ////        fprintf(stderr, "PBO extension is not available!\n");
  25. //        Sleep(2000);
  26. //        exit(0);
  27. //    }
  28.  
  29.     if (isNonPowerTwo)
  30.     {
  31.         npotTexturesAvailable = GL_TRUE;
  32.     }
  33.     else
  34.     {
  35.         qDebug() << "GL_ARB_texture_non_power_of_two extension is not available!";
  36.         qDebug() << "Only portion of window will be used for rendering";
  37.     }
  38.  
  39.     // Check for minimum resources
  40.     GLint intVal = 0;
  41.     glGetIntegerv(GL_MAX_TEXTURE_UNITS, &intVal);
  42.  
  43.     if (intVal < 3)
  44.     {
  45.         qDebug() << "Fewer than 3 texture units available!";
  46.         Sleep(2000);
  47.         exit(0);
  48.     }
  49.     glGetIntegerv(GL_MAX_TEXTURE_SIZE, &intVal);
  50.     if (intVal < 1024)
  51.     {
  52.         qDebug() << "1024x1024 texture not supported!";
  53.         Sleep(2000);
  54.         exit(0);
  55.     }
  56.  
  57.     qDebug() << "Controls:";
  58.     qDebug() << "\tRight-click for menu";
  59.     qDebug() << "\tb\tToggle motion blur";
  60.     qDebug() << "\tp\tToggle PBO usage";
  61.     qDebug() << "\tarrows\t+/- rotation speed";
  62.     qDebug() << "\tq\t\tExit demo";
  63.  
  64.     // Colors
  65.     glClearColor(0.0f, 0.0f, 0.0f, 1.0f );
  66.     glColor4f(0.0f, 0.0f, 0.0f, 1.0f );
  67.  
  68.     // Texture matrix is the only one we'll change
  69.     glMatrixMode(GL_TEXTURE);
  70.  
  71.     // Set up textures
  72.     SetupTextures();
  73. }
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And as stated above the first call to glGetIntergv is what fails . Any ideas?