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Diffstat (limited to 'src/glu/sgi/libnurbs/internals/trimregion.cc')
| -rw-r--r-- | src/glu/sgi/libnurbs/internals/trimregion.cc | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/glu/sgi/libnurbs/internals/trimregion.cc b/src/glu/sgi/libnurbs/internals/trimregion.cc new file mode 100644 index 00000000000..64b4ffc10e3 --- /dev/null +++ b/src/glu/sgi/libnurbs/internals/trimregion.cc @@ -0,0 +1,116 @@ +/* +** 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. +*/ + +/* + * trimregion.c++ + * + * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $ + * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/trimregion.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $ + */ + +#include "glimports.h" +#include "myassert.h" +#include "mystdio.h" +#include "trimregion.h" +#include "backend.h" + +TrimRegion::TrimRegion( void ) +{ +} + +void +TrimRegion::setDu( REAL du ) +{ + oneOverDu = 1.0/du; +} + +void +TrimRegion::init( long npts, Arc_ptr extrema ) +{ + left.init( npts, extrema, extrema->pwlArc->npts - 1 ); + left.getNextPt(); + + right.init( npts, extrema, 0 ); + right.getPrevPt(); +} + +void +TrimRegion::getPts( Arc_ptr extrema ) +{ + left.getNextPts( extrema ); + right.getPrevPts( extrema ); +} + +void +TrimRegion::getPts( Backend &backend ) +{ + left.getNextPts( bot.vval, backend ); + right.getPrevPts( bot.vval, backend ); +} + +void +TrimRegion::getGridExtent( void ) +{ + getGridExtent( left.last(), right.last() ); +} + +void +TrimRegion::getGridExtent( TrimVertex *l, TrimVertex *r ) +{ + bot.ustart = (long) ((l->param[0] - uarray.uarray[0])*oneOverDu); + if( l->param[0] >= uarray.uarray[bot.ustart] ) bot.ustart++; +// if( l->param[0] > uarray.uarray[bot.ustart] ) bot.ustart++; + assert( l->param[0] <= uarray.uarray[bot.ustart] ); + assert( l->param[0] >= uarray.uarray[bot.ustart-1] ); + + bot.uend = (long) ((r->param[0] - uarray.uarray[0])*oneOverDu); + if( uarray.uarray[bot.uend] >= r->param[0] ) bot.uend--; +// if( uarray.uarray[bot.uend] > r->param[0] ) bot.uend--; + assert( r->param[0] >= uarray.uarray[bot.uend] ); + assert( r->param[0] <= uarray.uarray[bot.uend+1] ); +} + +int +TrimRegion::canTile( void ) +{ + TrimVertex *lf = left.first(); + TrimVertex *ll = left.last(); + TrimVertex *l = ( ll->param[0] > lf->param[0] ) ? ll : lf; + + TrimVertex *rf = right.first(); + TrimVertex *rl = right.last(); + TrimVertex *r = ( rl->param[0] < rf->param[0] ) ? rl : rf; + return (l->param[0] <= r->param[0]) ? 1 : 0; +} + |