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167 lines
5 KiB
C++
167 lines
5 KiB
C++
/*
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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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* hull.c++
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*
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* $Date$ $Revision: 1.1 $
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* $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libnurbs/internals/hull.cc,v 1.1 2004/02/02 16:39:11 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 "hull.h"
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#include "gridvertex.h"
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#include "gridtrimvertex.h"
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#include "gridline.h"
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#include "trimline.h"
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#include "uarray.h"
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#include "trimregion.h"
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Hull::Hull( void )
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{}
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Hull::~Hull( void )
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{}
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/*----------------------------------------------------------------------
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* Hull:init - this routine does the initialization needed before any
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* calls to nextupper or nextlower can be made.
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*----------------------------------------------------------------------
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*/
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void
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Hull::init( void )
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{
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TrimVertex *lfirst = left.first();
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TrimVertex *llast = left.last();
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if( lfirst->param[0] <= llast->param[0] ) {
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fakeleft.init( left.first() );
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upper.left = &fakeleft;
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lower.left = &left;
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} else {
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fakeleft.init( left.last() );
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lower.left = &fakeleft;
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upper.left = &left;
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}
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upper.left->last();
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lower.left->first();
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if( top.ustart <= top.uend ) {
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upper.line = ⊤
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upper.index = top.ustart;
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} else
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upper.line = 0;
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if( bot.ustart <= bot.uend ) {
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lower.line = ⊥
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lower.index = bot.ustart;
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} else
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lower.line = 0;
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TrimVertex *rfirst = right.first();
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TrimVertex *rlast = right.last();
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if( rfirst->param[0] <= rlast->param[0] ) {
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fakeright.init( right.last() );
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lower.right = &fakeright;
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upper.right = &right;
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} else {
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fakeright.init( right.first() );
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upper.right = &fakeright;
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lower.right = &right;
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}
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upper.right->first();
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lower.right->last();
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}
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/*----------------------------------------------------------------------
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* nextupper - find next vertex on upper hull of trim region.
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* - if vertex is on trim curve, set vtop point to
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* that vertex. if vertex is on grid, set vtop to
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* point to temporary area and stuff coordinants into
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* temporary vertex. Also, place grid coords in temporary
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* grid vertex.
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*----------------------------------------------------------------------
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*/
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GridTrimVertex *
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Hull::nextupper( GridTrimVertex *gv )
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{
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if( upper.left ) {
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gv->set( upper.left->prev() );
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if( gv->isTrimVert() ) return gv;
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upper.left = 0;
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}
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if( upper.line ) {
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assert( upper.index <= upper.line->uend );
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gv->set( uarray.uarray[upper.index], upper.line->vval );
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gv->set( upper.index, upper.line->vindex );
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if( upper.index++ == upper.line->uend ) upper.line = 0;
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return gv;
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}
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if( upper.right ) {
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gv->set( upper.right->next() );
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if( gv->isTrimVert() ) return gv;
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upper.right = 0;
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}
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return 0;
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}
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GridTrimVertex *
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Hull::nextlower( register GridTrimVertex *gv )
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{
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if( lower.left ) {
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gv->set( lower.left->next() );
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if( gv->isTrimVert() ) return gv;
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lower.left = 0;
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}
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if( lower.line ) {
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gv->set( uarray.uarray[lower.index], lower.line->vval );
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gv->set( lower.index, lower.line->vindex );
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if( lower.index++ == lower.line->uend ) lower.line = 0;
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return gv;
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}
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if( lower.right ) {
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gv->set( lower.right->prev() );
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if( gv->isTrimVert() ) return gv;
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lower.right = 0;
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}
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return 0;
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}
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