Texturing in a QGLWidget

Hey,

I'm just trying to setup a minimal example trying to draw a textured quad and already failing on this one. Code looks like this:

Code:

---

class Foo : public QGLWidget
{
public:
  Foo( QWidget* parent ) : QGLWidget( parent )
  {
  }
 
  void initializeGL( )
  {
    glDisable( GL_LIGHTING );
    glEnable( GL_TEXTURE_2D );
    glViewport( 0, 0, width( ), height( ) );
 
    glMatrixMode( GL_PROJECTION );
    glLoadIdentity( );
 
    gluPerspective( 45.0f, (GLfloat)width( ) / (GLfloat)height( ), 0.1f, 100.0f );
 
    glMatrixMode( GL_MODELVIEW );
    glLoadIdentity( );
 
    texId = bindTexture( "test.png" );
  }
 
  void paintGL( ) override
  {
    glClearColor( 1.0f, 1.0f, 1.0f, 1.0f );
    glClear( GL_COLOR_BUFFER_BIT );    
 
    glLoadIdentity();
    glTranslatef( 0.0f, 0.0f, -6.0f );
    //drawTexture( rect( ), texId);
    glBegin( GL_QUADS );
      glTexCoord2f( 0.0f, 0.0f );
      glVertex3f( -1.0f, 1.0f, 0.0f );
      glTexCoord2f( 1.0f, 0.0f );
      glVertex3f( 1.0f, 1.0f, 0.0f );
      glTexCoord2f( 1.0f, 1.0f );
      glVertex3f( 1.0f, -1.0f, 0.0f );
      //glColor3f( 0.0f, 1.0f, 0.0f );
      glTexCoord2f( 0.0f, 1.0f );
      glVertex3f( -1.0f, -1.0f, 0.0f );
    glEnd( );
  }
 
private:
  GLuint texId;
};
 
/*
 * Application entry point.
 */
int main( int argc, char **argv )
{
  QApplication app(argc, argv);
 
  QMainWindow *window = new QMainWindow( );
  window->setFixedSize( 800, 600 );
  window->setWindowTitle( QString::fromUtf8( "test" ) );
 
  QWidget *centralWidget = new QWidget( window );
  QVBoxLayout* layout = new QVBoxLayout( centralWidget );
  Foo* foo = new Foo( centralWidget );
  layout->addWidget( foo );
 
  window->setCentralWidget( centralWidget );
  window->show( );
 
  return app.exec( );
}

---

I've also tried to manually bind the texture with glGenTexture, glBindTexture and converting the QImage to a OpenGL format and I've tried to experiment with drawTexture but nothing works. If I comment in the glColor line, my quad is rendered green, so it's definitely in my viewport. Am I maybe missing some other state variable or might this be a GL context problem?

Can I somehow double check that bindTexture worked as expected? Because texId will be 0 no matter if I input a valid or invalid filename. Are there any constraits about the texture's size? Because mine is 609x731.