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