使用Gtk+的OpenGL，尽管背景被清除，但是形状并没有被绘制

I am trying to get OpenGL to work with gtk+. It seemed to be working size I was able to clear the background color. However, when I went to draw something it is not there. Am I missing something. I put the eye at 10, 10, 10 and I am looking at the origin. I should see a back triangle near the origin.I am trying to get OpenGL to work with gtk+. It