STATE_engine_clip_edge

 

 



   returns one of the four
   EDGE_NOT_SEEN if the edge is outside the rendering window
  					in this case p1,p2 == clipped_p1,clipped_p2

   EDGE_FULLY_SEEN if the edge is fully inside the rendering window
  					in this case p1,p2 == clipped_p1,clipped_p2

   EDGE_PARTIALLY_SEEN if some of the edge is inside the window
  					in this case clipped_p1,clipped_p2 is the seen part

   VR_ERROR an error occurred 
  					in this case clipped_p1,clipped_p2 are not valid

 

 

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