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      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