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bezier: Optimize CBezierCurve::getYForPoint (#3321)
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@ -48,27 +48,25 @@ float CBezierCurve::getXForT(float t) {
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// Todo: this probably can be done better and faster
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// Todo: this probably can be done better and faster
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float CBezierCurve::getYForPoint(float x) {
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float CBezierCurve::getYForPoint(float x) {
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if (x >= 1.0)
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if (x >= 1.f)
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return 1.0;
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return 1.f;
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// binary search for the range UPDOWN X
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int index = 0;
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int upperT = BAKEDPOINTS - 1;
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bool below = true;
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int lowerT = 0;
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for (int step = (BAKEDPOINTS + 1) / 2; step > 0; step /= 2) {
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int mid = upperT / 2;
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if (below)
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index += step;
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else
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index -= step;
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while (std::abs(upperT - lowerT) > 1) {
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below = m_aPointsBaked[index].x < x;
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if (m_aPointsBaked[mid].x > x) {
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upperT = mid;
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} else {
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lowerT = mid;
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}
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mid = (upperT + lowerT) / 2;
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}
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}
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int lowerIndex = index - (!below || index == BAKEDPOINTS - 1);
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// in the name of performance i shall make a hack
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// in the name of performance i shall make a hack
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const auto LOWERPOINT = &m_aPointsBaked[std::clamp(lowerT, 0, BAKEDPOINTS - 1)];
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const auto LOWERPOINT = &m_aPointsBaked[lowerIndex];
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const auto UPPERPOINT = &m_aPointsBaked[std::clamp(upperT, 0, BAKEDPOINTS - 1)];
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const auto UPPERPOINT = &m_aPointsBaked[lowerIndex + 1];
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const auto PERCINDELTA = (x - LOWERPOINT->x) / (UPPERPOINT->x - LOWERPOINT->x);
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const auto PERCINDELTA = (x - LOWERPOINT->x) / (UPPERPOINT->x - LOWERPOINT->x);
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@ -76,4 +74,4 @@ float CBezierCurve::getYForPoint(float x) {
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return 0.f;
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return 0.f;
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return LOWERPOINT->y + (UPPERPOINT->y - LOWERPOINT->y) * PERCINDELTA;
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return LOWERPOINT->y + (UPPERPOINT->y - LOWERPOINT->y) * PERCINDELTA;
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}
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}
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