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🧪 Add tests for isinr and icosr scaling functions #3

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Merged
perim merged 1 commit into from
May 22, 2026
Merged

🧪 Add tests for isinr and icosr scaling functions #3

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31 changes: 31 additions & 0 deletions tests/test_direction.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -30,5 +30,36 @@ int main()
printf("min: %i max: %i\n", min, max);
assert(min <= 2 && max <= 2);

const int distances[] = {0, 1, 10, 100, 1000, 10000, 65536, 100000, 1000000};
for (int dist : distances)
{
int32_t rmax = 0, rmin = 0;
for (int i = 0; i <= UINT16_MAX; i++)
{
double exact = dist * sin(2 * M_PI * i / 65536.0) / 16.0;
int s = lround(exact);
int s5d = isinr(i, dist);
int err = s - s5d;
if (err > rmax) rmax = err;
if (err < rmin) rmin = err;
}
int limit = dist > 0 ? (dist * 2 / 65536) + 2 : 0;
printf("isinr dist %i min: %i max: %i (limit: %i)\n", dist, rmin, rmax, limit);
assert(rmin >= -limit && rmax <= limit);

rmax = 0; rmin = 0;
for (int i = 0; i <= UINT16_MAX; i++)
{
double exact = dist * cos(2 * M_PI * i / 65536.0) / 16.0;
int c = lround(exact);
int c5d = icosr(i, dist);
int err = c - c5d;
if (err > rmax) rmax = err;
if (err < rmin) rmin = err;
}
printf("icosr dist %i min: %i max: %i (limit: %i)\n", dist, rmin, rmax, limit);
assert(rmin >= -limit && rmax <= limit);
}

return 0;
}
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