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author | marha <marha@users.sourceforge.net> | 2012-09-03 09:54:39 +0200 |
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committer | marha <marha@users.sourceforge.net> | 2012-09-03 09:54:39 +0200 |
commit | b86e8562b1ddca2a8bc29f22a79451a041bf5293 (patch) | |
tree | 60fead0638fce6922b4043767fa991ff1f0e3488 /mesalib/src/glu/sgi/libnurbs/internals/monotonizer.cc | |
parent | 53192e17e55aa9ed3e3721bf4fdcb2b01a595202 (diff) | |
download | vcxsrv-b86e8562b1ddca2a8bc29f22a79451a041bf5293.tar.gz vcxsrv-b86e8562b1ddca2a8bc29f22a79451a041bf5293.tar.bz2 vcxsrv-b86e8562b1ddca2a8bc29f22a79451a041bf5293.zip |
mesa xkeyboard-config git update 3 sep 2012
Diffstat (limited to 'mesalib/src/glu/sgi/libnurbs/internals/monotonizer.cc')
-rw-r--r-- | mesalib/src/glu/sgi/libnurbs/internals/monotonizer.cc | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/mesalib/src/glu/sgi/libnurbs/internals/monotonizer.cc b/mesalib/src/glu/sgi/libnurbs/internals/monotonizer.cc deleted file mode 100644 index 5845d310b..000000000 --- a/mesalib/src/glu/sgi/libnurbs/internals/monotonizer.cc +++ /dev/null @@ -1,260 +0,0 @@ -/* -** License Applicability. Except to the extent portions of this file are -** made subject to an alternative license as permitted in the SGI Free -** Software License B, Version 1.1 (the "License"), the contents of this -** file are subject only to the provisions of the License. You may not use -** this file except in compliance with the License. You may obtain a copy -** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 -** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: -** -** http://oss.sgi.com/projects/FreeB -** -** Note that, as provided in the License, the Software is distributed on an -** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS -** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND -** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A -** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. -** -** Original Code. The Original Code is: OpenGL Sample Implementation, -** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, -** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. -** Copyright in any portions created by third parties is as indicated -** elsewhere herein. All Rights Reserved. -** -** Additional Notice Provisions: The application programming interfaces -** established by SGI in conjunction with the Original Code are The -** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released -** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version -** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X -** Window System(R) (Version 1.3), released October 19, 1998. This software -** was created using the OpenGL(R) version 1.2.1 Sample Implementation -** published by SGI, but has not been independently verified as being -** compliant with the OpenGL(R) version 1.2.1 Specification. -*/ - -/* - * monotonizer.c++ - * - */ - -#include "glimports.h" -#include "mystdio.h" -#include "myassert.h" -#include "arc.h" -#include "arctess.h" -#include "bezierarc.h" -#include "bin.h" -#include "mapdesc.h" -#include "nurbsconsts.h" -#include "subdivider.h" - -/*----------------------------------------------------------------------------- - * Subdivider::decompose - break all curves into monotone arcs - *----------------------------------------------------------------------------- - */ -int -Subdivider::decompose( Bin& bin, REAL geo_stepsize ) -{ - Arc_ptr jarc; - for( jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) { - if( ! jarc->isTessellated() ) { - /* points have not been transformed, therefore they may be either - homogeneous or inhomogeneous */ - tessellate( jarc, geo_stepsize ); - if( jarc->isDisconnected() || jarc->next->isDisconnected() ) - return 1; - } - } - - for( jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) { - monotonize( jarc, bin ); - } - -#ifndef NDEBUG - for( jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) { - assert( isMonotone( jarc ) != 0 ); - } -#endif - - return 0; -} - -void -Subdivider::tessellate( Arc_ptr jarc, REAL geo_stepsize ) -{ - BezierArc *b = jarc->bezierArc; - Mapdesc *mapdesc = b->mapdesc; - - if( mapdesc->isRational() ) { - REAL max = mapdesc->calcVelocityRational( b->cpts, b->stride, b->order ); - REAL arc_stepsize = (max > 1.0) ? (1.0/max) : 1.0; - if( jarc->bezierArc->order != 2 ) - arctessellator.tessellateNonlinear( jarc, geo_stepsize, arc_stepsize, 1 ); - else { - arctessellator.tessellateLinear( jarc, geo_stepsize, arc_stepsize, 1 ); - } - } else { - REAL max = mapdesc->calcVelocityNonrational( b->cpts, b->stride, b->order ); - REAL arc_stepsize = (max > 1.0) ? (1.0/max) : 1.0; - if( jarc->bezierArc->order != 2 ) - arctessellator.tessellateNonlinear( jarc, geo_stepsize, arc_stepsize, 0 ); - else { - arctessellator.tessellateLinear( jarc, geo_stepsize, arc_stepsize, 0 ); - } - } -} - -/*------------------------------------------------------------------------- - * Subdivider::monotonize - break up a jordan arc into s,t-monotone - * components. This code will remove degenerate segments, including - * arcs of only a single point. - *------------------------------------------------------------------------- - */ -void -Subdivider::monotonize( Arc_ptr jarc, Bin& bin ) -{ - TrimVertex *firstvert = jarc->pwlArc->pts; - TrimVertex *lastvert = firstvert + (jarc->pwlArc->npts - 1); - long uid = jarc->nuid; - arc_side side = jarc->getside(); - dir sdir = none; - dir tdir = none; - int degenerate = 1; - - int nudegenerate; - int change; - - TrimVertex *vert; - for( vert = firstvert; vert != lastvert; vert++ ) { - - nudegenerate = 1; - change = 0; - - /* check change relative to s axis, clear degenerate bit if needed */ - REAL sdiff = vert[1].param[0] - vert[0].param[0]; - if( sdiff == 0 ) { - if( sdir != same ) { - sdir = same; - change = 1; - } - } else if( sdiff < 0.0 ) { - if( sdir != down ) { - sdir = down; - change = 1; - } - nudegenerate = 0; - } else { - if( sdir != up ) { - sdir = up; - change = 1; - } - nudegenerate = 0; - } - - /* check change relative to t axis, clear degenerate bit if needed */ - REAL tdiff = vert[1].param[1] - vert[0].param[1]; - if( tdiff == 0 ) { - if( tdir != same ) { - tdir = same; - change = 1; - } - } else if( tdiff < 0.0 ) { - if( tdir != down ) { - tdir = down; - change = 1; - } - nudegenerate = 0; - } else { - if( tdir != up ) { - tdir = up; - change = 1; - } - nudegenerate = 0; - } - - if( change ) { - if( ! degenerate ) { - /* make last segment into separate pwl curve */ - jarc->pwlArc->npts = vert - firstvert + 1; - jarc = (new(arcpool) Arc( side, uid ))->append( jarc ); - jarc->pwlArc = new(pwlarcpool) PwlArc(); - bin.addarc( jarc ); - } - firstvert = jarc->pwlArc->pts = vert; - degenerate = nudegenerate; - } - } - jarc->pwlArc->npts = vert - firstvert + 1; - - if( degenerate ) { - /* remove jarc from circularly linked list */ - jarc->prev->next = jarc->next; - jarc->next->prev = jarc->prev; - - assert( jarc->prev->check( ) != 0 ); - assert( jarc->next->check( ) != 0 ); - - /* remove jarc from bin */ - bin.remove_this_arc( jarc ); - - jarc->pwlArc->deleteMe( pwlarcpool ); jarc->pwlArc = 0; - jarc->deleteMe( arcpool ); - } -} - -/*------------------------------------------------------------------------- - * Subdivider::isMonotone - return true if arc is monotone AND non-degenerate - *------------------------------------------------------------------------- - */ -int -Subdivider::isMonotone( Arc_ptr jarc ) -{ - TrimVertex *firstvert = jarc->pwlArc->pts; - TrimVertex *lastvert = firstvert + (jarc->pwlArc->npts - 1); - - if( firstvert == lastvert ) return 1; - - TrimVertex *vert = firstvert; - enum dir sdir; - enum dir tdir; - - REAL diff = vert[1].param[0] - vert[0].param[0]; - if( diff == 0.0 ) - sdir = same; - else if( diff < 0.0 ) - sdir = down; - else - sdir = up; - - diff = vert[1].param[1] - vert[0].param[1]; - if( diff == 0.0 ) - tdir = same; - else if( diff < 0.0 ) - tdir = down; - else - tdir = up; - - if( (sdir == same) && (tdir == same) ) return 0; - - for( ++vert ; vert != lastvert; vert++ ) { - diff = vert[1].param[0] - vert[0].param[0]; - if( diff == 0.0 ) { - if( sdir != same ) return 0; - } else if( diff < 0.0 ) { - if( sdir != down ) return 0; - } else { - if( sdir != up ) return 0; - } - - diff = vert[1].param[1] - vert[0].param[1]; - if( diff == 0.0 ) { - if( tdir != same ) return 0; - } else if( diff < 0.0 ) { - if( tdir != down ) return 0; - } else { - if( tdir != up ) return 0; - } - } - return 1; -} - |