reactos/dll/win32/glu32/libnurbs/internals/flist.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  * flist.c++
  37  *
  38  * $Date$ $Revision: 1.1 $
  39  * $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libnurbs/internals/flist.cc,v 1.1 2004/02/02 16:39:11 navaraf Exp $
  40  */
  41
  42 #include "glimports.h"
  43 #include "myassert.h"
  44 #include "mystdio.h"
  45 #include "flist.h"
  46
  47 /*----------------------------------------------------------------------------
  48  * Flist::Flist - initialize a REAL number array
  49  *----------------------------------------------------------------------------
  50  */
  51 Flist::Flist( void )
  52 {
  53     npts = 0;
  54     pts = 0;
  55     start = end = 0;
  56 }
  57
  58 /*----------------------------------------------------------------------------
  59  * Flist::~Flist - free a REAL number array
  60  *----------------------------------------------------------------------------
  61  */
  62 Flist::~Flist( void )
  63 {
  64     if( npts ) delete[] pts;
  65 }
  66
  67 void
  68 Flist::add( REAL x )
  69 {
  70     pts[end++] = x;
  71     assert( end <= npts );
  72 }
  73
  74 /*----------------------------------------------------------------------------
  75  * Flist::filter - remove duplicate numbers from array
  76  *----------------------------------------------------------------------------
  77  */
  78 void Flist::filter( void )
  79 {
  80     sorter.qsort( pts, end );
  81     start = 0;
  82
  83     int j = 0;
  84     for( int i = 1; i < end; i++ ) {
  85         if( pts[i] == pts[i-j-1] )
  86             j++;
  87         pts[i-j] = pts[i];
  88     }
  89     end -= j;
  90 }
  91
  92 /*----------------------------------------------------------------------------
  93  * Flist::grow - ensure that array is large enough
  94  *----------------------------------------------------------------------------
  95  */
  96 void Flist::grow( int maxpts )
  97 {
  98     if( npts < maxpts ) {
  99         if( npts ) delete[] pts;
 100         npts = 2 * maxpts;
 101         pts = new REAL[npts];
 102         assert( pts != 0 );
 103     }
 104     start = end = 0;
 105 }
 106
 107 /*----------------------------------------------------------------------------
 108  * Flist::taper - ignore head and tail of array
 109  *----------------------------------------------------------------------------
 110  */
 111 void Flist::taper( REAL from, REAL to )
 112 {
 113     while( pts[start] != from )
 114         start++;
 115
 116     while( pts[end-1] != to )
 117         end--;
 118 }
 119
 120