js/src/correct/check-3d-morph.js

   1 /*
   2  * Copyright (C) 2007 Apple Inc.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 var loops = 15
  27 var nx = 120
  28 var nz = 120
  29
  30 function morph(a, f) {
  31     var PI2nx = Math.PI * 8/nx
  32     var sin = Math.sin
  33     var f30 = -(50 * sin(f*Math.PI*2))
  34
  35     for (var i = 0; i < nz; ++i) {
  36         for (var j = 0; j < nx; ++j) {
  37             a[3*(i*nx+j)+1]    = sin((j-1) * PI2nx ) * -f30
  38         }
  39     }
  40 }
  41
  42
  43 var a = Array()
  44 for (var i=0; i < nx*nz*3; ++i)
  45     a[i] = 0
  46
  47 for (var i = 0; i < loops; ++i) {
  48     morph(a, i/loops)
  49 }
  50
  51 testOutput = 0;
  52 for (var i = 0; i < nx; i++)
  53     testOutput += a[3*(i*nx+i)+1];
  54 a = null;
  55 print(testOutput == 6.394884621840902e-14)