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