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

NAME    [Toc]    [Back]

     glPassThrough - place a marker in the feedback buffer

C SPECIFICATION    [Toc]    [Back]

     void glPassThrough( GLfloat token )

PARAMETERS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

     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	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    [Toc]    [Back]

     glPassThrough is ignored if the GL	is not in feedback mode.

ERRORS    [Toc]    [Back]

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

ASSOCIATED GETS    [Toc]    [Back]

     glGet with	argument GL_RENDER_MODE

SEE ALSO    [Toc]    [Back]

     glFeedbackBuffer, glRenderMode


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