133 lines
3.5 KiB
C++
133 lines
3.5 KiB
C++
#include "maths.hpp"
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#include "debug.hpp"
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#include "tap.hpp"
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#include <cstdlib>
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#include <cmath>
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#include <limits>
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using std::sqrt;
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using std::numeric_limits;
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void
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test_comparisons (void)
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{
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// Check pos/neg zeroes
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CHECK (almost_equal ( 0.f, 0.f));
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CHECK (almost_equal ( 0.f, -0.f));
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CHECK (almost_equal (-0.f, 0.f));
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CHECK (almost_equal (-0.f, -0.f));
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CHECK (almost_equal ( 0., 0.));
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CHECK (almost_equal ( 0., -0.));
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CHECK (almost_equal (-0., 0.));
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CHECK (almost_equal (-0., -0.));
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// Check zero comparison with values near the expected cutoff
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CHECK ( almost_zero (1e-45f));
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CHECK (!almost_zero (1e-40f));
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CHECK (!exactly_zero (1e-45f));
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// Compare values a little away from zero
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CHECK (!almost_equal (-2.0, 0.0));
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CHECK (!almost_equal (-2.f, 0.f));
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// Compare values at the maximum extreme
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CHECK (!almost_equal (-std::numeric_limits<float>::max (), 0.f));
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CHECK (!almost_equal (-std::numeric_limits<float>::max (),
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std::numeric_limits<float>::max ()));
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// Compare infinity values
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CHECK ( almost_equal (numeric_limits<double>::infinity (),
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numeric_limits<double>::infinity ()));
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CHECK (!almost_equal (numeric_limits<double>::infinity (), 0.0));
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// Compare NaNs
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CHECK (!almost_equal (0., numeric_limits<double>::quiet_NaN ()));
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CHECK (!almost_equal (numeric_limits<double>::quiet_NaN (), 0.));
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CHECK (!almost_equal (numeric_limits<double>::quiet_NaN (),
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numeric_limits<double>::quiet_NaN ()));
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}
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void
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test_normalisations (void)
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{
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// u8 to float
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{
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auto a = renormalise<uint8_t,float> (255);
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CHECK_EQ (a, 1.f);
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auto b = renormalise<uint8_t,float> (0);
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CHECK_EQ (b, 0.f);
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}
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// float to u8
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{
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struct {
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float a;
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uint8_t b;
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} TESTS[] = {
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{ 1.f, 255 },
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{ 0.f, 0 },
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{ 2.f, 255 },
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{ -1.f, 0 }
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};
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for (auto i: TESTS) {
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std::cerr << "x";
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auto v = renormalise<decltype(i.a),decltype(i.b)> (i.a);
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CHECK_EQ ((unsigned)v, (unsigned)i.b);
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}
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}
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}
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int
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main (int, char **) {
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// Max out the precision in case we trigger debug output
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std::cerr.precision (std::numeric_limits<double>::digits10);
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std::cout.precision (std::numeric_limits<double>::digits10);
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test_comparisons ();
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test_normalisations ();
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CHECK_EQ (util::min (-2, 0, 2), -2);
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CHECK_EQ (util::max (-2, 0, 2), 2);
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CHECK_EQ (pow2 (2), 4);
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CHECK_EQ (pow2 (4), 16);
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CHECK_EQ (rootsquare (2, 2), sqrt (8));
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double pos_zero = 1.0 / numeric_limits<double>::infinity ();
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double neg_zero = -1.0 / numeric_limits<double>::infinity ();
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CHECK_EQ (sign (-1), -1);
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CHECK_EQ (sign ( 1), 1);
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CHECK_EQ (sign (pos_zero), 1);
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CHECK_EQ (sign (neg_zero), -1);
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CHECK_EQ (sign ( numeric_limits<double>::infinity ()), 1);
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CHECK_EQ (sign (-numeric_limits<double>::infinity ()), -1);
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CHECK_EQ (to_degrees (PI<float>), 180.f);
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CHECK_EQ (to_degrees (PI<double>), 180.0);
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CHECK_EQ (to_radians (180.f), PI<float>);
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CHECK_EQ (to_radians (180.0), PI<double>);
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CHECK_EQ (log2 (8u), 3);
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CHECK_EQ (log2 (1u), 0);
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CHECK_EQ (log2 (9u), 3);
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CHECK_EQ (log2up (9u), 4);
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CHECK_EQ (log2up (8u), 3);
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CHECK_EQ (log2up (1u), 0);
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util::TAP::logger tap;
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tap.todo ("conver to TAP");
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}
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