glPassThrough.3gl

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

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Last Edited: Mon, May 22, 1995

AFV