/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2024, Paul Elder * * Fixed / Floating point utility tests */ #include #include #include #include #include "../src/ipa/libipa/fixedpoint.h" #include "test.h" using namespace std; using namespace libcamera; using namespace ipa; class FixedPointUtilsTest : public Test { protected: /* R for real, I for integer */ template int testFixedToFloat(I input, R expected) { R out = fixedToFloatingPoint(input); R prec = 1.0 / (1 << FracPrec); if (std::abs(out - expected) > prec) { cerr << "Reverse conversion expected " << input << " to convert to " << expected << ", got " << out << std::endl; return TestFail; } return TestPass; } template int testSingleFixedPoint(double input, T expected) { T ret = floatingToFixedPoint(input); if (ret != expected) { cerr << "Expected " << input << " to convert to " << expected << ", got " << ret << std::endl; return TestFail; } /* * The precision check is fairly arbitrary but is based on what * the rkisp1 is capable of in the crosstalk module. */ double f = fixedToFloatingPoint(ret); if (std::abs(f - input) > 0.005) { cerr << "Reverse conversion expected " << ret << " to convert to " << input << ", got " << f << std::endl; return TestFail; } return TestPass; } int testFixedPoint() { /* * The second 7.992 test is to test that unused bits don't * affect the result. */ std::map testCases = { { 7.992, 0x3ff }, { 0.2, 0x01a }, { -0.2, 0x7e6 }, { -0.8, 0x79a }, { -0.4, 0x7cd }, { -1.4, 0x74d }, { -8, 0x400 }, { 0, 0 }, }; int ret; for (const auto &testCase : testCases) { ret = testSingleFixedPoint<4, 7, uint16_t>(testCase.first, testCase.second); if (ret != TestPass) return ret; } /* Special case with a superfluous one in the unused bits */ ret = testFixedToFloat<4, 7, uint16_t, double>(0xbff, 7.992); if (ret != TestPass) return ret; return TestPass; } int run() { /* fixed point conversion test */ if (testFixedPoint() != TestPass) return TestFail; return TestPass; } }; TEST_REGISTER(FixedPointUtilsTest) streaming Jacopo Mondi's clone of libcameragit repository hosting on libcamera.org

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