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authorMike Gabriel <mike.gabriel@das-netzwerkteam.de>2015-02-02 15:02:49 +0100
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2015-02-02 15:02:49 +0100
commitb16b9e4656e7199c2aec74a4c8ebc7a875d3ba73 (patch)
tree4361edef0d42d5bf5ac984ef72b4fac35426eae7 /nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/project.gl
parent0d5a83e986f39982c0924652a3662e60b1f23162 (diff)
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-_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_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $
-_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(Project, map object coordinates to window coordinates)
-_names(Project)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1 _param2 _param3)
-Specify the object coordinates.
-_phead(_param4)
-Specifies the current modelview matrix (as from a _glcmnd(GetDoublev) call).
-_phead(_param5)
-Specifies the current projection matrix (as from a _glcmnd(GetDoublev) call).
-_phead(_param6)
-Specifies the current viewport (as from a _glcmnd(GetIntegerv) call).
-_phead(_param7 _param8 _param9)
-Return the computed window coordinates.
-.SH DESCRIPTION
-_cmnd transforms the specified object coordinates into window coordinates
-using _param4, _param5, and _param6. The result is stored
-in _param7, _param8, and _param9. A return value of
-_const(TRUE) indicates success, a return value of _const(FALSE)
-indicates failure.
-.P
-To compute the coordinates,
-let $v ~=~ (_eqnparam1, _eqnparam2, _eqnparam3, 1.0)$
-represented as a matrix with 4 rows and 1 column.
-Then _cmnd computes $v sup prime$
-as follows:
-.sp
-.EQ
-v sup prime ~=~ P ~times~ M ~times~ v
-.EN
-.sp
-where $P$ is the current projection matrix _param5, $M$ is the current
-modelview matrix _param4 (both represented as
-$4 times 4$ matrices in column-major order) and '$times$' represents
-matrix multiplication.
-.P
-The window coordinates are then computed as follows:
-.sp
-.EQ
-_eqnparam7 ~=~ _eqnparam6 (0) ~+~ _eqnparam6 (2) ~*~ (v sup prime (0) ~+~ 1)~/~2
-.EN
-.sp
-.EQ
-_eqnparam8 ~=~ _eqnparam6 (1) ~+~ _eqnparam6 (3)~*~(v sup prime (1) ~+~ 1)~/~2 .EN
-.sp
-.EQ
-_eqnparam9 ~=~ (v sup prime (2) ~+~ 1)~/~ 2
-.EN
-.sp
-.SH SEE ALSO
-_glcmnd(Get), _cmnd(UnProject)
-