workbench/libs/mesa/src/glu/sgi/libnurbs/internals/trimregion.cc

   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