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81 lines
2.5 KiB
81 lines
2.5 KiB
/**************************************************************************
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* *
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* Copyright (C) 1992, Silicon Graphics, Inc. *
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* *
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* These coded instructions, statements, and computer programs contain *
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* unpublished proprietary information of Silicon Graphics, Inc., and *
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* are protected by Federal copyright law. They may not be disclosed *
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* to third parties or copied or duplicated in any form, in whole or *
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* in part, without the prior written consent of Silicon Graphics, Inc. *
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* *
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**************************************************************************/
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/*
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* curvesub.c++ - $Revision: 1.1 $
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* Derrick Burns - 1991
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*/
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#include "glimport.h"
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#include "myassert.h"
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#include "mystdio.h"
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#include "subdivid.h"
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#include "renderhi.h"
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#include "backend.h"
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#include "quilt.h"
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#include "curvelis.h"
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#include "curve.h"
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#include "nurbscon.h"
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/*--------------------------------------------------------------------------
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* drawCurves - main curve rendering entry point
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*--------------------------------------------------------------------------
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*/
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void
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Subdivider::drawCurves( void )
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{
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REAL from[1], to[1];
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Flist bpts;
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qlist->getRange( from, to, bpts );
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renderhints.init( );
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backend.bgncurv();
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for( int i=bpts.start; i<bpts.end-1; i++ ) {
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REAL pta, ptb;
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pta = bpts.pts[i];
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ptb = bpts.pts[i+1];
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qlist->downloadAll( &pta, &ptb, backend );
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Curvelist curvelist( qlist, pta, ptb );
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samplingSplit( curvelist, renderhints.maxsubdivisions );
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}
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backend.endcurv();
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}
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/*--------------------------------------------------------------------------
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* samplingSplit - recursively subdivide patch, cull check each subpatch
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*--------------------------------------------------------------------------
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*/
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void
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Subdivider::samplingSplit( Curvelist& curvelist, int subdivisions )
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{
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if( curvelist.cullCheck() == CULL_TRIVIAL_REJECT ) return;
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curvelist.getstepsize();
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if( curvelist.needsSamplingSubdivision() && (subdivisions > 0) ) {
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REAL mid = ( curvelist.range[0] + curvelist.range[1] ) * 0.5;
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Curvelist lowerlist( curvelist, mid );
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samplingSplit( lowerlist, subdivisions-1 ); // lower
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samplingSplit( curvelist, subdivisions-1 ); // upper
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} else {
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long nu = 1 + ((long) (curvelist.range[2] / curvelist.stepsize));
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backend.curvgrid( curvelist.range[0], curvelist.range[1], nu );
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backend.curvmesh( 0, nu );
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}
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}
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