XPLMRegisterDrawCallback

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XPLMRegisterDrawCallback

XPLM_API int                  XPLMRegisterDrawCallback(
                                   XPLMDrawCallback_f   inCallback,    
                                   XPLMDrawingPhase     inPhase,    
                                   int                  inWantsBefore,    
                                   void *               inRefcon);    
This routine registers a low level drawing callback. Pass in the phase you want to be called for and whether you want to be called before or after. This routine returns 1 if the registration was successful, or 0 if the phase does not exist in this version of x-plane. You may register a callback multiple times for the same or different phases as long as the refcon is unique each time.