osb/source/game/StarInterpolationTracker.cpp

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2023-06-20 04:33:09 +00:00
#include "StarInterpolationTracker.hpp"
#include "StarRoot.hpp"
#include "StarAssets.hpp"
namespace Star {
InterpolationTracker::InterpolationTracker(Json config) {
if (config.isNull()) {
config = JsonObject();
} else if (config.type() == Json::Type::String) {
auto assets = Root::singleton().assets();
config = assets->json(config.toString());
}
m_interpolationEnabled = config.getBool("interpolationEnabled", false);
m_entityUpdateDelta = config.getUInt("enittyUpdateDelta", 3);
m_stepLead = config.getUInt("stepLead", 0);
m_extrapolationHint = config.getUInt("extrapolationHint", 0);
m_stepTrackFactor = config.getDouble("stepTrackFactor", 1.0);
m_stepMaxDistance = config.getDouble("stepMaxDistance", 0.0);
m_currentStep = 0.0;
}
bool InterpolationTracker::interpolationEnabled() const {
return m_interpolationEnabled;
}
unsigned InterpolationTracker::extrapolationHint() const {
if (m_interpolationEnabled)
return m_extrapolationHint;
else
return 0;
}
unsigned InterpolationTracker::entityUpdateDelta() const {
return m_entityUpdateDelta;
}
void InterpolationTracker::receiveStepUpdate(double remoteStep) {
m_lastStepUpdate = remoteStep;
}
void InterpolationTracker::update(double newLocalStep) {
double dt = newLocalStep - m_currentStep;
m_currentStep = newLocalStep;
if (!m_predictedStep || !m_lastStepUpdate || dt < 0.0f) {
m_predictedStep = m_lastStepUpdate;
} else {
*m_lastStepUpdate += dt;
*m_predictedStep += dt;
*m_predictedStep += (*m_lastStepUpdate - *m_predictedStep) * m_stepTrackFactor;
m_predictedStep = clamp<double>(*m_predictedStep, *m_lastStepUpdate - m_stepMaxDistance, *m_lastStepUpdate + m_stepMaxDistance);
}
}
float InterpolationTracker::interpolationLeadSteps() const {
if (!m_interpolationEnabled || !m_predictedStep || !m_lastStepUpdate)
return 0.0f;
return *m_lastStepUpdate - *m_predictedStep + m_stepLead;
}
}