88 lines
1.9 KiB
C++
88 lines
1.9 KiB
C++
#include "StarTickRateMonitor.hpp"
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#include "StarTime.hpp"
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namespace Star {
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TickRateMonitor::TickRateMonitor(double window) : m_window(window) {
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reset();
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}
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double TickRateMonitor::window() const {
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return m_window;
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}
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void TickRateMonitor::reset() {
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m_lastTick = Time::monotonicTime() - m_window;
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m_ticks = 0;
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}
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double TickRateMonitor::tick(unsigned count) {
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double currentTime = Time::monotonicTime();
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if (m_lastTick > currentTime) {
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m_lastTick = currentTime - m_window;
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m_ticks = 0;
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} else if (m_lastTick < currentTime) {
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double timePast = currentTime - m_lastTick;
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double rate = m_ticks / m_window;
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m_ticks = max(0.0, m_ticks - timePast * rate);
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m_lastTick = currentTime;
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}
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m_ticks += count;
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return m_ticks / m_window;
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}
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double TickRateMonitor::rate() const {
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return TickRateMonitor(*this).tick(0);
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}
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TickRateApproacher::TickRateApproacher(double targetTickRate, double window)
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: m_tickRateMonitor(window), m_targetTickRate(targetTickRate) {}
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double TickRateApproacher::window() const {
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return m_tickRateMonitor.window();
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}
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void TickRateApproacher::setWindow(double window) {
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if (window != m_tickRateMonitor.window()) {
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m_tickRateMonitor = TickRateMonitor(window);
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tick(m_targetTickRate * window);
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}
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}
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double TickRateApproacher::targetTickRate() const {
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return m_targetTickRate;
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}
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void TickRateApproacher::setTargetTickRate(double targetTickRate) {
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m_targetTickRate = targetTickRate;
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}
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void TickRateApproacher::reset() {
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setWindow(window());
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}
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double TickRateApproacher::tick(unsigned count) {
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return m_tickRateMonitor.tick(count);
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}
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double TickRateApproacher::rate() const {
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return m_tickRateMonitor.rate();
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}
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double TickRateApproacher::ticksBehind() {
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return (m_targetTickRate - m_tickRateMonitor.rate()) * window();
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}
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double TickRateApproacher::ticksAhead() {
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return -ticksBehind();
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}
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double TickRateApproacher::spareTime() {
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return ticksAhead() / m_targetTickRate;
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}
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}
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