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Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/project.gl')
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diff --git a/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/project.gl b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/project.gl new file mode 100644 index 000000000..51068e539 --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/project.gl @@ -0,0 +1,91 @@ +_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) + |