glPassThrough(3G)	       OpenGL Reference		     glPassThrough(3G)



NAME
     glPassThrough - place a marker in the feedback buffer



C SPECIFICATION
     void glPassThrough( GLfloat token )


PARAMETERS
     token  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
     glRenderMode 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	glFeedbackBuffer 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, glRenderMode














									Page 1