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author | Reinhard Tartler <siretart@tauware.de> | 2011-10-10 17:43:39 +0200 |
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committer | Reinhard Tartler <siretart@tauware.de> | 2011-10-10 17:43:39 +0200 |
commit | f4092abdf94af6a99aff944d6264bc1284e8bdd4 (patch) | |
tree | 2ac1c9cc16ceb93edb2c4382c088dac5aeafdf0f /nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/viewport.gl | |
parent | a840692edc9c6d19cd7c057f68e39c7d95eb767d (diff) | |
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Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1
Summary: Imported nx-X11-3.1.0-1.tar.gz
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Imported nx-X11-3.1.0-1.tar.gz
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Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/viewport.gl')
-rw-r--r-- | nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/viewport.gl | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/viewport.gl b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/viewport.gl new file mode 100644 index 000000000..b923cb8e7 --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/viewport.gl @@ -0,0 +1,84 @@ +_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(Viewport,set the viewport) +_names(Viewport) +.EQ +delim $$ +.EN +.SH PARAMETERS +_phead(_param1 _param2) +Specify the lower left corner of the viewport rectangle, +in pixels. The initial value is (0,0). +_phead(_param3 _param4) +Specify the width and height +of the viewport. +When a GL context is first attached to a window, +_param3 and _param4 are set to the dimensions of that window. +.SH DESCRIPTION +_cmnd specifies the affine transformation of $x$ and $y$ from +normalized device coordinates to window coordinates. +Let ($x sub nd$, $y sub nd$) be normalized device coordinates. +Then the window coordinates ($x sub w$, $y sub w$) are computed as follows: +.sp +.ce +.EQ +x sub w ~=~ ( x sub nd ~+~ 1 ) left ( _eqnparam3 over 2 right ) ~+~ _eqnparam1 +.EN +.sp +.ce +.EQ +y sub w ~=~ ( y sub nd ~+~ 1 ) left ( _eqnparam4 over 2 right ) ~+~ _eqnparam2 +.EN +.RE +.P +Viewport width and height are silently clamped +to a range that depends on the implementation. +To query this range, call _cmnd(Get) with argument +_const(MAX_VIEWPORT_DIMS). +.SH ERRORS +_const(INVALID_VALUE) is generated if either _param3 or _param4 is negative. +.P +_const(INVALID_OPERATION) is generated if _cmnd +is executed between the execution of _cmnd(Begin) +and the corresponding execution of _cmnd(End). +.bp +.SH ASSOCIATED GETS +_cmnd(Get) with argument _const(VIEWPORT) +.br +_cmnd(Get) with argument _const(MAX_VIEWPORT_DIMS) +.SH SEE ALSO +_cmnd(DepthRange) |