2004-02-02 16:39:16 +00:00
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/*
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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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**
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** http://oss.sgi.com/projects/FreeB
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**
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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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**
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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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**
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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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*/
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/*
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* trimregion.c++
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*
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2005-01-06 13:58:04 +00:00
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* $Date$ $Revision: 1.1 $
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2004-02-02 16:39:16 +00:00
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* $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libnurbs/internals/trimregion.cc,v 1.1 2004/02/02 16:39:13 navaraf Exp $
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*/
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#include "glimports.h"
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#include "myassert.h"
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#include "mystdio.h"
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#include "trimregion.h"
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#include "backend.h"
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TrimRegion::TrimRegion( void )
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{
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}
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void
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TrimRegion::setDu( REAL du )
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{
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oneOverDu = 1.0/du;
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}
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void
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TrimRegion::init( long npts, Arc_ptr extrema )
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{
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left.init( npts, extrema, extrema->pwlArc->npts - 1 );
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left.getNextPt();
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right.init( npts, extrema, 0 );
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right.getPrevPt();
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}
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void
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TrimRegion::getPts( Arc_ptr extrema )
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{
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left.getNextPts( extrema );
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right.getPrevPts( extrema );
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}
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void
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TrimRegion::getPts( Backend &backend )
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{
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left.getNextPts( bot.vval, backend );
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right.getPrevPts( bot.vval, backend );
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}
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void
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TrimRegion::getGridExtent( void )
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{
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getGridExtent( left.last(), right.last() );
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}
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void
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TrimRegion::getGridExtent( TrimVertex *l, TrimVertex *r )
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{
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bot.ustart = (long) ((l->param[0] - uarray.uarray[0])*oneOverDu);
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if( l->param[0] >= uarray.uarray[bot.ustart] ) bot.ustart++;
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// if( l->param[0] > uarray.uarray[bot.ustart] ) bot.ustart++;
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assert( l->param[0] <= uarray.uarray[bot.ustart] );
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assert( l->param[0] >= uarray.uarray[bot.ustart-1] );
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bot.uend = (long) ((r->param[0] - uarray.uarray[0])*oneOverDu);
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if( uarray.uarray[bot.uend] >= r->param[0] ) bot.uend--;
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// if( uarray.uarray[bot.uend] > r->param[0] ) bot.uend--;
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assert( r->param[0] >= uarray.uarray[bot.uend] );
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assert( r->param[0] <= uarray.uarray[bot.uend+1] );
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}
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int
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TrimRegion::canTile( void )
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{
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TrimVertex *lf = left.first();
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TrimVertex *ll = left.last();
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TrimVertex *l = ( ll->param[0] > lf->param[0] ) ? ll : lf;
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TrimVertex *rf = right.first();
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TrimVertex *rl = right.last();
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TrimVertex *r = ( rl->param[0] < rf->param[0] ) ? rl : rf;
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return (l->param[0] <= r->param[0]) ? 1 : 0;
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}
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