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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2024, Paul Elder <paul.elder@ideasonboard.com>
*
* Fixed / Floating point utility tests
*/
#include <cmath>
#include <iostream>
#include <map>
#include <stdint.h>
#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<unsigned int IntPrec, unsigned int FracPrec, typename I, typename R>
int testFixedToFloat(I input, R expected)
{
R out = fixedToFloatingPoint<IntPrec, FracPrec, R>(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<unsigned int IntPrec, unsigned int FracPrec, typename T>
int testSingleFixedPoint(double input, T expected)
{
T ret = floatingToFixedPoint<IntPrec, FracPrec, T>(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<IntPrec, FracPrec, double>(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<double, uint16_t> 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)
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