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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/histogram.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/histogram.gl')
-rw-r--r-- | nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/histogram.gl | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/histogram.gl b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/histogram.gl new file mode 100644 index 000000000..011a0782e --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/histogram.gl @@ -0,0 +1,151 @@ +_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,tbl|eqn)_C_ +_header(Histogram,define histogram table) +_names(Histogram) +.EQ +delim $$ +.EN +_define(@<__target>@,@<_param1>@)_C_ +_define(@<__width>@,@<_param2>@)_C_ +_define(@<__internalformat>@,@<_param3>@)_C_ +_define(@<__sink>@,@<_param4>@)_C_ +.SH PARAMETERS +_phead(__target) +The histogram whose parameters are to be set. +Must be one of +_const(HISTOGRAM) or +_const(PROXY_HISTOGRAM). +_phead(__width) +The number of entries in the histogram table. Must be a power of 2. +_phead(__internalformat) +The format of entries in the histogram table. +Must be one of +_const(ALPHA), +_const(ALPHA4), +_const(ALPHA8), +_const(ALPHA12), +_const(ALPHA16), +_const(LUMINANCE), +_const(LUMINANCE4), +_const(LUMINANCE8), +_const(LUMINANCE12), +_const(LUMINANCE16), +_const(LUMINANCE_ALPHA), +_const(LUMINANCE4_ALPHA4), +_const(LUMINANCE6_ALPHA2), +_const(LUMINANCE8_ALPHA8), +_const(LUMINANCE12_ALPHA4), +_const(LUMINANCE12_ALPHA12), +_const(LUMINANCE16_ALPHA16), +_const(R3_G3_B2), +_const(RGB), +_const(RGB4), +_const(RGB5), +_const(RGB8), +_const(RGB10), +_const(RGB12), +_const(RGB16), +_const(RGBA), +_const(RGBA2), +_const(RGBA4), +_const(RGB5_A1), +_const(RGBA8), +_const(RGB10_A2), +_const(RGBA12), or +_const(RGBA16). +_phead(__sink) +If _const(TRUE), pixels will be consumed by the histogramming +process and no drawing or texture loading will take place. +If _const(FALSE), pixels will proceed to the minmax process after +histogramming. +.SH DESCRIPTION +When _const(HISTOGRAM) is enabled, RGBA color components are converted to +histogram table indices by clamping to the range [0,1], multiplying by +the width of the histogram table, and rounding to the nearest integer. +The table entries selected by the RGBA indices are then incremented. +(If the internal format of the histogram table includes luminance, then +the index derived from the R color component determines the luminance +table entry to be incremented.) If a histogram table entry is incremented +beyond its maximum value, then its value becomes undefined. (This is +not an error.) +.PP +Histogramming is performed only for RGBA pixels (though these may +be specified originally as color indices and converted to RGBA by +index table lookup). +Histogramming is enabled with _cmnd(Enable) and disabled with _cmnd(Disable). +.PP +When __target is _const(HISTOGRAM), _cmnd redefines the current +histogram table to have __width entries of the format specified by +__internalformat. +The entries are indexed 0 through $_eqnparam2 ~-~ 1$, and +all entries are initialized to zero. +The values in the previous histogram table, if any, are lost. +If __sink is _const(TRUE), then pixels are discarded after histogramming; +no further processing of the pixels takes place, and no drawing, +texture loading, or pixel readback will result. +.PP +When __target is _const(PROXY_HISTOGRAM), _cmnd computes all +state information as if the histogram table were to be redefined, +but does not actually define the new table. +If the requested histogram table is too large to be supported, then the +state information will be set to zero. +This provides a way to determine if a histogram table with the given +parameters can be supported. +.PP +.SH NOTES +_cmnd is present only if _arbstring(imaging) is returned when _cmnd(GetString) +is called with an argument of _const(EXTENSIONS). +.SH ERRORS +_const(INVALID_ENUM) is generated if __target is not one of the allowable +values. +.P +_const(INVALID_VALUE) is generated if __width is less than zero or is +not a power of 2. +.P +_const(INVALID_ENUM) is generated if __internalformat is not one of the +allowable values. +.P +_const(TABLE_TOO_LARGE) is generated if __target is _const(HISTOGRAM) +and the histogram table specified is too large for the implementation. +.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(GetHistogramParameter) +.SH SEE ALSO +_cmnd(GetHistogram), +_cmnd(ResetHistogram) |