PerformanceTests/SunSpider/tests/sunspider-1.0/3d-morph.js

/*
 * Copyright (C) 2007 Apple Inc.  All rights reserved.
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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 expected = 6;
if (("" + testOutput)[0] != expected)
    throw "Error: bad test output: expected leading digit to be " + expected + " but got " + testOutput;