131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
/*
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UtilFloorwrap(Test) - verify integer scale remainder wrapping
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Copyright (C) Lumiera.org
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2011, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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#include "lib/test/run.hpp"
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#include "lib/util.hpp"
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#include <cmath>
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//#include <vector>
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#include <iostream>
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#include <boost/format.hpp>
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using ::Test;
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using std::cout;
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//using std::rand;
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using boost::format;
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namespace util {
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namespace test {
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namespace{ // Test data and operations
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div_t
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floorwrap (int num, int den)
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{
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div_t res = div (num,den);
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if (0 > (num^den) && res.rem)
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{ // wrap similar to floor()
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--res.quot;
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res.rem = den - (-res.rem);
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}
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return res;
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}
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void
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showWrap (int val, int scale)
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{
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div_t wrap = floorwrap(val,scale);
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cout << format ("% 3d /% 1d =% 1d %% =% d floor=% 4.1f wrap = (%2d,%2d) \n")
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% val % scale % (val/scale)
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% (val%scale) % floor(double(val)/scale)
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% wrap.quot % wrap.rem;
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}
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} // (End) test data and operations
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/**********************************************************************
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* @test Evaluate a custom built integer floor function.
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* This function is crucial for Lumiera's rule of quantisation
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* of time values into frame intervals. This rule requires time
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* points to be rounded towards the next lower frame border always,
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* irrespective of the relation to the actual time origin.
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* Contrast this to the built-in integer division operator, which
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* truncates towards zero.
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*
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* @note if invoked with an non empty parameter, this test performs
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* some interesting timing comparisons, which initially were
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* used to tweak the implementation a bit.
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* @see util.hpp
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* @see QuantiserBasics_test
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*/
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class UtilFloorwrap_test : public Test
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{
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virtual void
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run (Arg arg)
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{
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showWrap ( 12,4);
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showWrap ( 11,4);
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showWrap ( 10,4);
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showWrap ( 9,4);
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showWrap ( 8,4);
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showWrap ( 7,4);
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showWrap ( 6,4);
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showWrap ( 5,4);
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showWrap ( 4,4);
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showWrap ( 3,4);
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showWrap ( 2,4);
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showWrap ( 1,4);
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showWrap ( 0,4);
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showWrap (- 1,4);
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showWrap (- 2,4);
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showWrap (- 3,4);
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showWrap (- 4,4);
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showWrap (- 5,4);
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showWrap (- 6,4);
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showWrap (- 7,4);
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showWrap (- 8,4);
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showWrap (- 9,4);
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showWrap (-10,4);
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showWrap (-11,4);
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showWrap (-12,4);
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}
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};
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LAUNCHER (UtilFloorwrap_test, "unit common");
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}} // namespace util::test
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