80 lines
1.2 KiB
C++
80 lines
1.2 KiB
C++
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#include <iostream>
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#include <Spectre/Game/GameTime.h>
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#include <Spectre/System/System.h>
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namespace sp {
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GameTime::GameTime(unsigned long updates_per_sec)
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{
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m_acc = 0;
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m_current = system::getMilliseconds();
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m_lastUpdate = m_current;
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setTimeStep(updates_per_sec);
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}
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double GameTime::getTimeStep() const
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{
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return m_slice;
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}
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void GameTime::setTimeStep(unsigned long updates_per_sec)
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{
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m_slice = (1000.0f / ((double) updates_per_sec));
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reset();
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}
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unsigned long GameTime::getElapsed() const
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{
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return m_current - m_lastUpdate;
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}
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bool GameTime::beginFrame()
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{
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reset();
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accumulateTime();
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if (m_acc > m_slice) {
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m_inLoop = true;
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}
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return m_inLoop;
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}
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bool GameTime::tick()
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{
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if (m_acc > m_slice) {
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m_acc -= m_slice;
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return true;
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}
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return false;
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}
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void GameTime::reset()
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{
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m_lastUpdate = m_current;
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m_inLoop = false;
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}
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void GameTime::accumulateTime()
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{
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updateTime();
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m_acc += (double) (m_current - m_lastUpdate);
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if (m_acc > (1000.f / m_slice)) {
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m_acc = 1000.f / m_slice;
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}
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}
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void GameTime::updateTime()
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{
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m_current = system::getMilliseconds();
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// Just to be safe. check so we don't get a negative interval.
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if (m_current < m_lastUpdate) {
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m_lastUpdate = m_current;
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}
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}
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} // namespace sp
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