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Code Issues 134 Wiki Activity

state_manager: Optimize computation of position from distance along the track (#141)

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TSegment::GetTFromS() is a significant hotspot in the non-rendering part of the state_manager update (about 13%). This change introduces a FastGetTFromS() version that interpolates from precomputed values instead of doing the whole calculation on every call. Computing position from track distance is now done in constant time. This reduces the contribution to about 0.3%.
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combolek
2026-07-19 06:06:56 -07:00
committed by GitHub
parent 8fbdf21ab8
commit b17a86bc18
2 changed files with 53 additions and 7 deletions
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5
world/Segment.h
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@@ -46,7 +46,8 @@ class TSegment
fRoll1 { 0.f },
fRoll2 { 0.f }; // przechyłka na końcach
double fLength { -1.0 }; // długość policzona
std::vector<double> fTsBuffer; // wartości parametru krzywej dla równych odcinków
std::vector<double> fTsBuffer; // wartości parametru krzywej t dla równych odcinków s
std::vector<double> fTsSlope; // nachylenie dt/du (= dt/ds * fStep) w tych samych punktach
double fStep = 0.0;
int iSegCount = 0; // ilość odcinków do rysowania krzywej
double fDirection = 0.0; // Ra: kąt prostego w planie; dla łuku kąt od Point1
@@ -56,7 +57,9 @@ class TSegment
glm::dvec3 GetFirstDerivative(double const fTime) const;
double RombergIntegral(double const fA, double const fB) const;
void InitTFromSInterpolateData();
double GetTFromS(double const s) const;
double FastGetTFromS(double const s) const;
glm::dvec3 RaInterpolate(double const t) const;
glm::dvec3 RaInterpolate0(double const t) const;