luau/bench/tests/sunspider/3d-morph.lua

--[[
 * Copyright (C) 2007 Apple Inc.  All rights reserved.
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 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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local function prequire(name) local success, result = pcall(require, name); return success and result end
local bench = script and require(script.Parent.bench_support) or prequire("bench_support") or require("../../bench_support")

function test()

local loops = 15
local nx = 120
local nz = 120

local function morph(a, f)
    local PI2nx = math.pi * 8/nx
    local sin = math.sin
    local f30 = -(50 * sin(f*math.pi*2))
    
    for i = 0,nz-1 do
        for j = 0,nx-1 do
            a[3*(i*nx+j)+1]    = sin((j-1) * PI2nx ) * -f30
        end
    end
end

    
local a = {}
for i = 0,nx*nz*3-1 do 
    a[i] = 0
end

for i = 0,loops-1 do
    morph(a, i/loops)
end

testOutput = 0;
for i = 0,nx-1 do
    testOutput = testOutput + a[3*(i*nx+i)+1];
end

a = nil;

-- 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.
local epsilon = 1e-13;
if (math.abs(testOutput) >= epsilon) then
    assert(false, "Error: bad test output: expected magnitude below " .. epsilon .. " but got " .. testOutput);
end

end

bench.runCode(test, "3d-morph")