/* * Copyright (C) 2007 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ var loops = 15 var nx = 120 var nz = 120 function morph(a, f) { var PI2nx = Math.PI * 8/nx var sin = Math.sin var f30 = -(50 * sin(f*Math.PI*2)) for (var i = 0; i < nz; ++i) { for (var j = 0; j < nx; ++j) { a[3*(i*nx+j)+1] = sin((j-1) * PI2nx ) * -f30 } } } var a = Array() for (var i=0; i < nx*nz*3; ++i) a[i] = 0 for (var i = 0; i < loops; ++i) { morph(a, i/loops) } testOutput = 0; for (var i = 0; i < nx; i++) testOutput += a[3*(i*nx+i)+1]; a = null; // This has to be an approximate test since ECMAscript doesn't formally specify // what sin() returns. Even if it did specify something like for example what Java 7 // says - that sin() has to return a value within 1 ulp of exact - then we still // would not be able to do an exact test here since that would allow for just enough // low-bit slop to create possibly big errors due to testOutput being a sum. var epsilon = 1e-13; if (Math.abs(testOutput) >= epsilon) throw "Error: bad test output: expected magnitude below " + epsilon + " but got " + testOutput;