Function I_WaitForTic

source/common/utility/i_time.cpp:120–148

}

int I_WaitForTic(int prevtic, double const ticrate)
{
	// Waits until the current tic is greater than prevtic. Time must not be frozen.

	int time;
	while ((time = I_GetTime(ticrate)) <= prevtic)
	{
		// Windows-specific note:
		// The minimum amount of time a thread can sleep is controlled by timeBeginPeriod.
		// We set this to 1 ms in DoMain.

		const uint64_t next = FirstFrameStartTime + TicToNS(prevtic + 1, ticrate);
		const uint64_t now = I_nsTime();

		if (next > now)
		{
			const uint64_t sleepTime = NSToMS(next - now);

			if (sleepTime > 2)
			{
				std::this_thread::sleep_for(std::chrono::milliseconds(sleepTime - 2));
			}
		}

		I_SetFrameTime();
	}

	return time;
}

uint64_t I_nsTime()
{