src/glu/sgi/libnurbs/internals/curvelist.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  * curvelist.c++
  37  *
  38  */
  39
  40 #include "glimports.h"
  41 #include "myassert.h"
  42 #include "mystdio.h"
  43 #include "quilt.h"
  44 #include "curvelist.h"
  45 #include "curve.h"
  46 #include "nurbsconsts.h"
  47 #include "types.h"
  48
  49 Curvelist::Curvelist( Quilt *quilts, REAL pta, REAL ptb )
  50 {
  51     curve = 0;
  52     for( Quilt *q = quilts; q; q = q->next )
  53         curve = new Curve( q, pta, ptb, curve );
  54     range[0] = pta;
  55     range[1] = ptb;
  56     range[2] = ptb - pta;
  57 }
  58
  59 Curvelist::Curvelist( Curvelist &upper, REAL value )
  60 {
  61     Curvelist &lower = *this;
  62     curve = 0;
  63     for( Curve *c = upper.curve; c; c = c->next )
  64         curve = new Curve( *c, value, curve );
  65
  66     lower.range[0] = upper.range[0];
  67     lower.range[1] = value;
  68     lower.range[2] = value - upper.range[0];
  69     upper.range[0] = value;
  70     upper.range[2] = upper.range[1] - value;
  71 }
  72
  73 Curvelist::~Curvelist()
  74 {
  75     while( curve ) {
  76         Curve *c = curve;
  77         curve = curve->next;
  78         delete c;
  79     }
  80 }
  81
  82 int
  83 Curvelist::cullCheck( void )
  84 {
  85     for( Curve *c = curve; c; c = c->next )
  86         if( c->cullCheck() == CULL_TRIVIAL_REJECT )
  87             return CULL_TRIVIAL_REJECT;
  88     return CULL_ACCEPT;
  89 }
  90
  91 void
  92 Curvelist::getstepsize( void )
  93 {
  94     stepsize = range[2];
  95     Curve *c;
  96     for( c = curve; c; c = c->next ) {
  97         c->getstepsize();
  98         c->clamp();
  99         stepsize =  ((c->stepsize < stepsize) ? c->stepsize : stepsize);
 100         if( c->needsSamplingSubdivision() ) break;
 101     }
 102     needsSubdivision = ( c ) ? 1 : 0;
 103 }
 104
 105 int
 106 Curvelist::needsSamplingSubdivision( void )
 107 {
 108     return needsSubdivision;
 109 }
 110