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Bezier: Fix incorrect binary search in bezier approx

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This commit is contained in:
vaxerski 2023-03-03 13:33:52 +00:00
parent 9c0e2bba54
commit 64f35c0e31
1 changed files with 12 additions and 9 deletions
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21
src/helpers/BezierCurve.cpp
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@ -45,24 +45,27 @@ float CBezierCurve::getXForT(float t) {
// Todo: this probably can be done better and faster // Todo: this probably can be done better and faster
float CBezierCurve::getYForPoint(float x) { float CBezierCurve::getYForPoint(float x) {
// binary search for the range UPDOWN X if (x >= 1.0)
float upperT = 1; return 1.0;
float lowerT = 0;
float mid = 0.5;
while (std::abs(upperT - lowerT) > INVBAKEDPOINTS) { // binary search for the range UPDOWN X
if (m_aPointsBaked[((int)(mid * (float)BAKEDPOINTS))].x > x) { int upperT = BAKEDPOINTS - 1;
int lowerT = 0;
int mid = upperT / 2;
while (std::abs(upperT - lowerT) > 1) {
if (m_aPointsBaked[mid].x > x) {
upperT = mid; upperT = mid;
} else { } else {
lowerT = mid; lowerT = mid;
} }
mid = (upperT + lowerT) / 2.f; mid = (upperT + lowerT) / 2;
} }
// in the name of performance i shall make a hack // in the name of performance i shall make a hack
const auto LOWERPOINT = &m_aPointsBaked[std::clamp((int)((float)BAKEDPOINTS * lowerT), 0, BAKEDPOINTS - 1)]; const auto LOWERPOINT = &m_aPointsBaked[std::clamp(lowerT, 0, BAKEDPOINTS - 1)];
const auto UPPERPOINT = &m_aPointsBaked[std::clamp((int)((float)BAKEDPOINTS * upperT), 0, BAKEDPOINTS - 1)]; const auto UPPERPOINT = &m_aPointsBaked[std::clamp(upperT, 0, BAKEDPOINTS - 1)];
const auto PERCINDELTA = (x - LOWERPOINT->x) / (UPPERPOINT->x - LOWERPOINT->x); const auto PERCINDELTA = (x - LOWERPOINT->x) / (UPPERPOINT->x - LOWERPOINT->x);