glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
// Shift down and right so 0,0 is the top left corner
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
// Shift down and right so 0,0 is the top left corner
glTranslatef(0.0, 0.0, -(far + near) / 2);
glDisable(GL_DEPTH_TEST);
glTranslatef(0.0, 0.0, -(far + near) / 2);
glDisable(GL_DEPTH_TEST);