replaced explicit call to glViewport with call to wxGLCanvas::OnSize, which might help with problem seen on Linux
replaced explicit call to glViewport with call to wxGLCanvas::OnSize, which might help with problem seen on Linux

nakijun/vtp,seanisom/vtp,seanisom/vtp,markraz/vtp,markraz/vtp,nakijun/vtp,markraz/vtp,seanisom/vtp,markraz/vtp,nakijun/vtp,seanisom/vtp,nakijun/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp