OpenGL glutDisplayFunc()

[H-N-N]

Hi there,

I want to set the OpenGL paint function by calling

glutDisplayFunc( paintGL() )

paintGL(void) returns void and includes glBegin() & glEnd() etc...

My compiler (VC++ 6) says:
"cannot convert parameter 1 from 'void (void)' to 'void (__cdecl *)(void)"

This project should be independant of MFC and MS specific functions. Calling

glutDisplayFunc( &paintGL() )

does not change anything.

This function looks like followed:

void View::paintGL(void)
{
 glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
 
 glLoadIdentity();
 gluLookAt(0,0,5,0,0,0,0,1,0);
 
 glBegin(GL_LINES);
  glVertex3f(-0.5,-0.5,0.0);
  glVertex3f(0.5,0.0,0.0);
  glVertex3f(0.0,0.5,0.0);
 
   glutSwapBuffers(); 
 glEnd();
 glFlush();
}

Do you have a clue what could be wrong?
Thank you alot in advance!!

Holger

[zach]

glutDisplayFunc() is a C function which does not accept member functions (C++ calling conventions). Try making it a global function for testing purposes. Maybe making it static could solve the problem, but I'm not sure about this.

[Bornish]

Try:

glutDisplayFunc( &View::paintGL )

Regards,

[H-N-N]

Thanks guys,

I now declared them as static. That helped!

Thanks alot!



Holger