NAME

passthrough − passes a single token through the Geometry Pipeline

SPECIFICATION

C
passthrough(token)
short token;

FORTRAN
subroutine passth(token)
integer*4 token

Pascal
procedure passthrough(token: longint);

DESCRIPTION

passthrough passes a single 16-bit integer through the Geometry Pipeline. Use it in feedback mode to parse the returned information. 

For example, you can use passthrough between every pair of points that is being transformed and clipped by the Geometry Engines.  If a point is clipped out, two passthrough tokens appear in a row in the output buffer.  It is dangerous to use passthrough when not in feedback mode; it can send a random routine to the raster subsystem. 

SEE ALSO

Programming Guide, Section 10.2, Feedback Mode

NOTE

This routine is available only in feedback mode. 

Version 3.6  —  December 20, 1987