_C_ License Applicability. Except to the extent portions of this file are _C_ made subject to an alternative license as permitted in the SGI Free _C_ Software License B, Version 1.1 (the "License"), the contents of this _C_ file are subject only to the provisions of the License. You may not use _C_ this file except in compliance with the License. You may obtain a copy _C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 _C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: _C_ _C_ http://oss.sgi.com/projects/FreeB _C_ _C_ Note that, as provided in the License, the Software is distributed on an _C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS _C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND _C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A _C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT. _C_ _C_ Original Code. The Original Code is: OpenGL Sample Implementation, _C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, _C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. _C_ Copyright in any portions created by third parties is as indicated _C_ elsewhere herein. All Rights Reserved. _C_ _C_ Additional Notice Provisions: The application programming interfaces _C_ established by SGI in conjunction with the Original Code are The _C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released _C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version _C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X _C_ Window System(R) (Version 1.3), released October 19, 1998. This software _C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation _C_ published by SGI, but has not been independently verified as being _C_ compliant with the OpenGL(R) version 1.2.1 Specification. _C_ _C_ The first character in this file must be an '_'! _C_ Anything on a line after _C_ is ignored _define(_filters,eqn)_C_ _C_ eqn is automatically replaced with neqn for nroff _header(PassThrough,place a marker in the feedback buffer) _names(PassThrough) .SH PARAMETERS _phead(_param1) Specifies a marker value to be placed in the feedback buffer following a _const(PASS_THROUGH_TOKEN). .SH DESCRIPTION .P Feedback is a GL render mode. The mode is selected by calling _cmnd(RenderMode) with _const(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 _cmnd(FeedbackBuffer) reference page for a description of the feedback buffer and the values in it. .P _cmnd inserts a user-defined marker in the feedback buffer when it is executed in feedback mode. _param1 is returned as if it were a primitive; it is indicated with its own unique identifying value: _const(PASS_THROUGH_TOKEN). The order of _cmnd commands with respect to the specification of graphics primitives is maintained. .SH NOTES _cmnd is ignored if the GL is not in feedback mode. .SH ERRORS _const(INVALID_OPERATION) is generated if _cmnd is executed between the execution of _cmnd(Begin) and the corresponding execution of _cmnd(End). .SH ASSOCIATED GETS _cmnd(Get) with argument _const(RENDER_MODE) .SH SEE ALSO _cmnd(FeedbackBuffer), _cmnd(RenderMode)