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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/pointsize.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/pointsize.gl')
-rw-r--r-- | nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/pointsize.gl | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/pointsize.gl b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/pointsize.gl new file mode 100644 index 000000000..0795df0d8 --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/pointsize.gl @@ -0,0 +1,145 @@ +_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(PointSize,specify the diameter of rasterized points) +_names(PointSize) +.EQ +delim $$ +.EN +.SH PARAMETERS +_phead(_param1) +Specifies the diameter of rasterized points. +The initial value is 1. +.SH DESCRIPTION +_cmnd specifies the rasterized diameter of both aliased and antialiased +points. +Using a point size other than 1 has different effects, +depending on whether point antialiasing is enabled. +To enable and disable point antialiasing, call +_cmnd(Enable) and _cmnd(Disable) +with argument _const(POINT_SMOOTH). Point antialiasing is initially disabled. +.P +If point antialiasing is disabled, +the actual size is determined by rounding the supplied size +to the nearest integer. +(If the rounding results in the value 0, +it is as if the point size were 1.) +If the rounded size is odd, +then the center point +($ x $, $ y $) +of the pixel fragment that represents the point is computed as +.sp +.ce +( $ \(lf ~ x sub w ~ \(rf ~+~ .5 $, $ \(lf ~ y sub w ~ \(rf ~+~ .5 $) +.sp +where $w$ subscripts indicate window coordinates. +All pixels that lie within the square grid of the rounded size centered at +($ x $, $ y $) +make up the fragment. +If the size is even, +the center point is +.sp +.ce +( $ \(lf ~ x sub w ~+~ .5 ~ \(rf$, $ \(lf ~ y sub w ~+~ .5 ~ \(rf $) +.sp +and the rasterized fragment's centers are the half-integer window coordinates +within the square of the rounded size centered at +($ x $, $ y $). +All pixel fragments produced in rasterizing a nonantialiased point are +assigned the same associated data, +that of the vertex corresponding to the point. +.P +If antialiasing is enabled, +then point rasterization produces a fragment for each pixel square +that intersects the region lying within the circle having diameter +equal to the current point size and centered at the point's +($ x sub w $, $ y sub w $). +The coverage value for each fragment is the window coordinate area +of the intersection of the circular region with the corresponding pixel square. +This value is saved and used in the final rasterization step. +The data associated with each fragment is the data associated with +the point being rasterized. +.P +Not all sizes are supported when point antialiasing is enabled. +If an unsupported size is requested, +the nearest supported size is used. +Only size 1 is guaranteed to be supported; +others depend on the implementation. +To query the range of supported sizes and the size difference between +supported sizes within the range, call +_cmnd(Get) with arguments +_const(SMOOTH_POINT_SIZE_RANGE) and +_const(SMOOTH_POINT_SIZE_GRANULARITY). +For aliased points, query the supported ranges and granularity with +_cmnd(Get) with arguments +_const(ALIASED_POINT_SIZE_RANGE) and +_const(ALIASED_POINT_SIZE_GRANULARITY). +.SH NOTES +The point size specified by _cmnd is always returned when _const(POINT_SIZE) +is queried. +Clamping and rounding for aliased and antialiased points have no effect +on the specified value. +.P +A non-antialiased point size may be clamped to an implementation-dependent +maximum. +Although this maximum cannot be queried, +it must be no less than the maximum value for antialiased points, +rounded to the nearest integer value. +.P +_const(POINT_SIZE_RANGE) and _const(POINT_SIZE_GRANULARITY) are +deprecated in GL versions 1.2 and greater. Their functionality has been +replaced by _const(SMOOTH_POINT_SIZE_RANGE) and +_const(SMOOTH_POINT_SIZE_GRANULARITY). +.SH ERRORS +_const(INVALID_VALUE) is generated if _param1 is less than or equal to 0. +.P +_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(POINT_SIZE) +.br +_cmnd(Get) with argument _const(ALIASED_POINT_SIZE_RANGE) +.br +_cmnd(Get) with argument _const(ALIASED_POINT_SIZE_GRANULARITY) +.br +_cmnd(Get) with argument _const(SMOOTH_POINT_SIZE_RANGE) +.br +_cmnd(Get) with argument _const(SMOOTH_POINT_SIZE_GRANULARITY) +.br +_cmnd(IsEnabled) with argument _const(POINT_SMOOTH) +.SH SEE ALSO +_cmnd(Enable) |