glPassThrough man page on DigitalUNIX

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glPassThrough(3G)					     glPassThrough(3G)

NAME
       glPassThrough - place a marker in the feedback buffer

SYNOPSIS
       void glPassThrough(
	       GLfloat token );

PARAMETERS
       Specifies  a marker value to be placed in the feedback buffer following
       a GL_PASS_THROUGH_TOKEN.

DESCRIPTION
       Feedback is a GL render mode. The mode is selected by calling glRender‚Äź
       Mode() with GL_FEEDBACK. When the GL is in feedback mode, no pixels are
       produced by rasterization. Instead, information about  primitives  that
       would have been rasterized is fed back to the application using the GL.
       See the glFeedbackBuffer() reference page  for  a  description  of  the
       feedback buffer and the values in it.

       glPassThrough()	inserts	 a  user-defined marker in the feedback buffer
       when it is executed in feedback mode.  token is returned as if it  were
       a  primitive;  it  is  indicated with its own unique identifying value:
       GL_PASS_THROUGH_TOKEN.  The  order  of  glPassThrough()	commands  with
       respect to the specification of graphics primitives is maintained.

NOTES
       glPassThrough() is ignored if the GL is not in feedback mode.

ERRORS
       GL_INVALID_OPERATION   is  generated  if	 glPassThrough()  is  executed
       between the execution of glBegin() and the corresponding	 execution  of
       glEnd().

ASSOCIATED GETS
       glGet() with argument GL_RENDER_MODE

SEE ALSO
       glFeedbackBuffer(3), glRenderMode(3)

							     glPassThrough(3G)
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