Opengl/Qt Design Problem!

[IcePic]

Hello!

I have a problem concerning the design of a opengl/qt programm.

I create a subclass from QGLWidget and overwrite the paintGl-method to do my renderstuff.
My subclass should have a vector with drawables. Drawables is a abstract class with a renderfunction. In this function every subclass from drawable should do their opengl stuff.
Something like this:



class Drawable {
virtual void render()=0;
}

class MyFirstObject : public Drawable {

void render() {
glBegin(GL_QUAD)
...
glEnd()
}
}

class GLWidget: public QGLWidget {

void paintGl() {
for(int i=0; i< drawables.size();i++) {
drawables.render();
}
}


The problem is, that i don't have an active opengl context in my drawables and so the opengl functions don't work. How can i solve this problem?