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** License Applicability. Except to the extent portions of this file are
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** made subject to an alternative license as permitted in the SGI Free
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** Software License B, Version 1.1 (the "License"), the contents of this
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** file are subject only to the provisions of the License. You may not use
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** this file except in compliance with the License. You may obtain a copy
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** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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** http://oss.sgi.com/projects/FreeB
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** Note that, as provided in the License, the Software is distributed on an
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** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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** Original Code. The Original Code is: OpenGL Sample Implementation,
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** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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** Copyright in any portions created by third parties is as indicated
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** elsewhere herein. All Rights Reserved.
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** Additional Notice Provisions: The application programming interfaces
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** established by SGI in conjunction with the Original Code are The
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** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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** Window System(R) (Version 1.3), released October 19, 1998. This software
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** was created using the OpenGL(R) version 1.2.1 Sample Implementation
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** published by SGI, but has not been independently verified as being
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** compliant with the OpenGL(R) version 1.2.1 Specification.
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* $Date: 2005/10/28 13:09:23 $ $Revision: 1.2 $
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* $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/trimline.cc,v 1.2 2005/10/28 13:09:23 brianp Exp $
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#include "glimports.h"
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size = 0; pts = 0; numverts = 0;
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tinterp = &t; binterp = &b;
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if( pts ) delete[] pts;
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Trimline::init( TrimVertex *v )
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Trimline::grow( long npts )
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if( pts ) delete[] pts;
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pts = new TrimVertex_p[size];
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Trimline::append( TrimVertex *v )
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assert( numverts != size );
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Trimline::init( long npts, Arc_ptr jarc, long last )
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jarcl.init( jarc, 0, last );
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TrimVertex *tmp=tinterp;
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Trimline::getNextPt()
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*binterp = *jarcl.getnextpt();
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Trimline::getPrevPt()
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*binterp = *jarcl.getprevpt();
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/*----------------------------------------------------------------------
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* getNextPts - make arrays of pointers to trim points on left and right
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* hulls of trim strip.
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*----------------------------------------------------------------------
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Trimline::getNextPts( REAL vval, Backend& backend )
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reset(); swap(); append( tinterp );
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assert( tinterp->param[1] >= vval );
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register TrimVertex *p;
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for( p=jarcl.getnextpt() ; p->param[1] >= vval; p=jarcl.getnextpt() ) {
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/* compute and copy pointer to final point on left hull */
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if( interpvert( last(), p, binterp, vval ) ) {
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binterp->nuid = p->nuid;
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backend.triangle( p, binterp, last() );
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(void) jarcl.getprevpt(); /* reset jarcl to proper position */
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Trimline::getPrevPts( REAL vval, Backend& backend )
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reset(); swap(); append( tinterp );
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assert( tinterp->param[1] >= vval );
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register TrimVertex *q;
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for( q=jarcl.getprevpt(); q->param[1] >= vval; q=jarcl.getprevpt() ) {
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/* compute and copy pointer to final point on right hull */
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if( interpvert( q, last(), binterp, vval ) ) {
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binterp->nuid = q->nuid;
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backend.triangle( last(), binterp, q );
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(void) jarcl.getnextpt(); /* reset jarcl to proper position */
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Trimline::getNextPts( Arc_ptr botarc )
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reset(); swap(); append( tinterp );
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PwlArc *lastpwl = botarc->prev->pwlArc;
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TrimVertex *lastpt1 = &lastpwl->pts[lastpwl->npts-1];
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TrimVertex *lastpt2 = botarc->pwlArc->pts;
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register TrimVertex *p = jarcl.getnextpt();
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for( append( p ); p != lastpt2; append( p ) ) {
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assert( p != lastpt1 );
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p = jarcl.getnextpt();
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Trimline::getPrevPts( Arc_ptr botarc )
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reset(); swap(); append( tinterp );
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PwlArc *lastpwl = botarc->prev->pwlArc;
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TrimVertex *lastpt1 = &lastpwl->pts[lastpwl->npts-1];
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TrimVertex *lastpt2 = botarc->pwlArc->pts;
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register TrimVertex *q = jarcl.getprevpt();
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for( append( q ); q != lastpt1; append( q ) ) {
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assert( q != lastpt2 );
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q = jarcl.getprevpt();
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Trimline::interpvert( TrimVertex *a, TrimVertex *b, TrimVertex *c, REAL vval )
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REAL denom = a->param[1] - b->param[1];
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if( vval == a->param[1] ) {
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c->param[0] = a->param[0];
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c->param[1] = a->param[1];
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} else if( vval == b->param[1] ) {
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c->param[0] = b->param[0];
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c->param[1] = b->param[1];
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REAL r = (a->param[1] - vval)/denom;
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c->param[0] = a->param[0] - r * (a->param[0] - b->param[0]);
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c->param[0] = a->param[0];
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c->param[1] = a->param[1];