title: OpenGL Geometry Shader Mac OS X
body: <p>I'm trying to get a simple pass through geometry shader to work under Mac OS X 10.6.  The code compiles and links without problem, but for some reason no geometry is being drawn to the screen.  Here's my shader code:</p>
  
  <pre><code>#version 120
  #extension GL_EXT_geometry_shader4: enable
  
  void main()
  {
      gl_Position = gl_PositionIn[0];
      EmitVertex();
  
      EndPrimitive();
  }
  </code></pre>
  
  <p>If anybody could help I'd appreciate it.</p>