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75 lines
2.5 KiB
Lua
75 lines
2.5 KiB
Lua
--[[
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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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local bench = script and require(script.Parent.bench_support) or require("bench_support")
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function test()
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local loops = 15
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local nx = 120
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local nz = 120
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local function morph(a, f)
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local PI2nx = math.pi * 8/nx
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local sin = math.sin
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local f30 = -(50 * sin(f*math.pi*2))
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for i = 0,nz-1 do
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for j = 0,nx-1 do
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a[3*(i*nx+j)+1] = sin((j-1) * PI2nx ) * -f30
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end
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end
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end
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local a = {}
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for i = 0,nx*nz*3-1 do
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a[i] = 0
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end
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for i = 0,loops-1 do
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morph(a, i/loops)
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end
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testOutput = 0;
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for i = 0,nx-1 do
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testOutput = testOutput + a[3*(i*nx+i)+1];
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end
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a = nil;
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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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local epsilon = 1e-13;
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if (math.abs(testOutput) >= epsilon) then
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assert(false, "Error: bad test output: expected magnitude below " .. epsilon .. " but got " .. testOutput);
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end
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end
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bench.runCode(test, "3d-morph")
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