1 /* 2 ** License Applicability. Except to the extent portions of this file are 3 ** made subject to an alternative license as permitted in the SGI Free 4 ** Software License B, Version 1.1 (the "License"), the contents of this 5 ** file are subject only to the provisions of the License. You may not use 6 ** this file except in compliance with the License. You may obtain a copy 7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: 9 ** 10 ** http://oss.sgi.com/projects/FreeB 11 ** 12 ** Note that, as provided in the License, the Software is distributed on an 13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS 14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND 15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A 16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. 17 ** 18 ** Original Code. The Original Code is: OpenGL Sample Implementation, 19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, 20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. 21 ** Copyright in any portions created by third parties is as indicated 22 ** elsewhere herein. All Rights Reserved. 23 ** 24 ** Additional Notice Provisions: The application programming interfaces 25 ** established by SGI in conjunction with the Original Code are The 26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released 27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version 28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X 29 ** Window System(R) (Version 1.3), released October 19, 1998. This software 30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation 31 ** published by SGI, but has not been independently verified as being 32 ** compliant with the OpenGL(R) version 1.2.1 Specification. 33 */ 34 35 /* 36 * trimregion.c++ 37 * 38 */ 39 40 //#include "glimports.h" 41 //#include "myassert.h" 42 //#include "mystdio.h" 43 #include "trimregion.h" 44 45 TrimRegion::TrimRegion( void ) 46 { 47 } 48 49 void 50 TrimRegion::setDu( REAL du ) 51 { 52 oneOverDu = 1.0/du; 53 } 54 55 void 56 TrimRegion::init( long npts, Arc_ptr extrema ) 57 { 58 left.init( npts, extrema, extrema->pwlArc->npts - 1 ); 59 left.getNextPt(); 60 61 right.init( npts, extrema, 0 ); 62 right.getPrevPt(); 63 } 64 65 void 66 TrimRegion::getPts( Arc_ptr extrema ) 67 { 68 left.getNextPts( extrema ); 69 right.getPrevPts( extrema ); 70 } 71 72 void 73 TrimRegion::getPts( Backend &backend ) 74 { 75 left.getNextPts( bot.vval, backend ); 76 right.getPrevPts( bot.vval, backend ); 77 } 78 79 void 80 TrimRegion::getGridExtent( void ) 81 { 82 getGridExtent( left.last(), right.last() ); 83 } 84 85 void 86 TrimRegion::getGridExtent( TrimVertex *l, TrimVertex *r ) 87 { 88 bot.ustart = (long) ((l->param[0] - uarray.uarray[0])*oneOverDu); 89 if( l->param[0] >= uarray.uarray[bot.ustart] ) bot.ustart++; 90 // if( l->param[0] > uarray.uarray[bot.ustart] ) bot.ustart++; 91 assert( l->param[0] <= uarray.uarray[bot.ustart] ); 92 assert( l->param[0] >= uarray.uarray[bot.ustart-1] ); 93 94 bot.uend = (long) ((r->param[0] - uarray.uarray[0])*oneOverDu); 95 if( uarray.uarray[bot.uend] >= r->param[0] ) bot.uend--; 96 // if( uarray.uarray[bot.uend] > r->param[0] ) bot.uend--; 97 assert( r->param[0] >= uarray.uarray[bot.uend] ); 98 assert( r->param[0] <= uarray.uarray[bot.uend+1] ); 99 } 100 101 int 102 TrimRegion::canTile( void ) 103 { 104 TrimVertex *lf = left.first(); 105 TrimVertex *ll = left.last(); 106 TrimVertex *l = ( ll->param[0] > lf->param[0] ) ? ll : lf; 107 108 TrimVertex *rf = right.first(); 109 TrimVertex *rl = right.last(); 110 TrimVertex *r = ( rl->param[0] < rf->param[0] ) ? rl : rf; 111 return (l->param[0] <= r->param[0]) ? 1 : 0; 112 } 113 114