passthrough man page on IRIX

passthrough man page on IRIX

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passthrough(3G)						       passthrough(3G)

NAME
     passthrough - passes a single token through the Geometry Pipeline

C SPECIFICATION
     void passthrough(token)
     short token;

PARAMETERS
     token   expects an integer which is used to mark specific sections in
	     input data so that when it is returned from the feedback buffer
	     the data is easier to decipher.

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.

NOTE
     This routine is available only in feedback mode; otherwise it is ignored.

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