glClearColor(#f0:0.2:1#,#f0:0.2:1#,#f0:0.2:1#,0);
glClear(#eGL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT:GL_COLOR_BUFFER_BIT:GL_DEPTH_BUFFER_BIT#);

if (#e1:0#)
  glEnable(GL_DEPTH_TEST);
else
  glDisable(GL_DEPTH_TEST);