diff options
Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthrange.gl')
-rw-r--r-- | nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthrange.gl | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthrange.gl b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthrange.gl new file mode 100644 index 000000000..b68b32e2a --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthrange.gl @@ -0,0 +1,79 @@ +_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(DepthRange,specify mapping of depth values from normalized device coordinates to window coordinates) +_names(DepthRange) +.EQ +delim $$ +.EN +.SH PARAMETERS +_phead(_param1) +Specifies the mapping of the near clipping plane to window coordinates. +The initial value is 0. +_phead(_param2) +Specifies the mapping of the far clipping plane to window coordinates. +The initial value is 1. +.SH DESCRIPTION +After clipping and division by \f2w\fP, +depth coordinates range from \-1 to 1, +corresponding to the near and far clipping planes. +_cmnd specifies a linear mapping of the normalized depth coordinates +in this range to window depth coordinates. +Regardless of the actual depth buffer implementation, +window coordinate depth values are treated as though they range +from 0 through 1 (like color components). +Thus, +the values accepted by _cmnd are both clamped to this range +before they are accepted. +.P +The setting of (0,1) maps the near plane to 0 and +the far plane to 1. +With this mapping, +the depth buffer range is fully utilized. +.SH NOTES +It is not necessary that _param1 be less than _param2. +Reverse mappings such as $_eqnparam1 ~=~ 1$, and $_eqnparam2 ~=~ 0$ +are acceptable. +.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(DEPTH_RANGE) +.SH SEE ALSO +_cmnd(DepthFunc), +_cmnd(PolygonOffset), +_cmnd(Viewport) |