75 lines
1.5 KiB
C++
75 lines
1.5 KiB
C++
#include "..\ebase.h"
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#include <thread>
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#include <chrono>
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using namespace std::chrono;
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// 游戏开始时间
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static steady_clock::time_point s_tStart;
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// 当前时间
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static steady_clock::time_point s_tNow;
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// 上一帧刷新时间
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static steady_clock::time_point s_tFixedUpdate;
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// 上一次更新时间
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static steady_clock::time_point s_tLastUpdate;
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// 上一帧与当前帧的时间间隔
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static int s_nInterval = 0;
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// 游戏开始时长
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static float s_fTotalTime = 0;
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// 每一帧间隔
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static milliseconds s_tExceptedInvertal;
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float e2d::Time::getTotalTime()
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{
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return s_fTotalTime;
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}
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int e2d::Time::getDeltaTime()
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{
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return s_nInterval;
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}
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bool e2d::Time::__init()
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{
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s_tStart = s_tLastUpdate = s_tFixedUpdate = s_tNow = steady_clock::now();
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s_tExceptedInvertal = milliseconds(17);
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return true;
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}
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void e2d::Time::__uninit()
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{
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}
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bool e2d::Time::__isReady()
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{
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return s_tExceptedInvertal < duration_cast<milliseconds>(s_tNow - s_tFixedUpdate);
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}
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void e2d::Time::__updateNow()
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{
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// 刷新时间
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s_tNow = steady_clock::now();
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}
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void e2d::Time::__updateLast()
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{
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s_tFixedUpdate += s_tExceptedInvertal;
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s_tLastUpdate = s_tNow;
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s_tNow = steady_clock::now();
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s_nInterval = static_cast<int>(duration_cast<milliseconds>(s_tNow - s_tLastUpdate).count());
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s_fTotalTime = static_cast<float>(duration_cast<milliseconds>(s_tNow - s_tStart).count()) / 1000.0f;
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}
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void e2d::Time::__sleep()
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{
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// 计算挂起时长
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int nWaitMS = 16 - static_cast<int>(duration_cast<milliseconds>(s_tNow - s_tFixedUpdate).count());
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if (nWaitMS > 1)
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{
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// 挂起线程，释放 CPU 占用
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std::this_thread::sleep_for(milliseconds(nWaitMS));
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}
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} |