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CMain: Use QueryPerformanceCounter for frame limiter on Windows

This commit is contained in:
Luke Street 2021-06-29 00:12:41 -04:00
parent d8e5f03886
commit 6e12554026
1 changed files with 32 additions and 1 deletions
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33
Runtime/CMain.cpp
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@ -40,7 +40,7 @@ public:
auto start = delta_clock::now();
duration_t adjustedSleepTime = SleepTime(targetFrameTime);
if (adjustedSleepTime.count() > 0) {
std::this_thread::sleep_for(adjustedSleepTime);
NanoSleep(adjustedSleepTime);
duration_t overslept = TimeSince(start) - adjustedSleepTime;
if (overslept < duration_t{targetFrameTime}) {
m_overheadTimes[m_overheadTimeIdx] = overslept;
@ -68,6 +68,37 @@ private:
duration_t TimeSince(delta_clock::time_point start) {
return std::chrono::duration_cast<duration_t>(delta_clock::now() - start);
}
#if _WIN32
bool m_initialized;
double m_countPerNs;
void NanoSleep(const duration_t duration) {
if (!m_initialized) {
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
m_countPerNs = static_cast<double>(freq.QuadPart) / 1000000000.0;
m_initialized = true;
}
DWORD ms = std::chrono::duration_cast<std::chrono::milliseconds>(duration).count();
auto tickCount = static_cast<LONGLONG>(static_cast<double>(duration.count()) * m_countPerNs);
LARGE_INTEGER count;
QueryPerformanceCounter(&count);
if (ms > 10) {
// Adjust for Sleep overhead
::Sleep(ms - 10);
}
auto end = count.QuadPart + tickCount;
do {
QueryPerformanceCounter(&count);
} while (count.QuadPart < end);
}
#else
void NanoSleep(const duration_t duration) {
std::this_thread::sleep_for(duration);
}
#endif
};
extern hecl::SystemString ExeDir;