C++ QueryPerformanceCounter和QueryPerformanceFrequency

Question

我一直在试图为我的游戏创建一个计时器，并且我听说过QueryPerformanceCounter和QueryPerformanceFrequency。有人能解释一下如何用这些来计算游戏循环中的时间/ fps /滴答？

Answer 1

Microsoft支持拥有知识库文章明确这一点：

How To Use QueryPerformanceCounter to Time Code

基本上你使用QueryPerformanceCounter之前，你想不想来一次活动后获得高分辨率定时器的值。

然后使用QueryPerformanceFrequency来获得每秒的滴答数。将时间差值除以该值以将该值转换为秒。

Answer 2

LARGE_INTEGER m_liPerformanceFrequency; 
QueryPerformanceFrequency(&m_liPerformanceFrequency); 

//... 

LARGE_INTEGER liPerformanceCount; 
QueryPerformanceCounter(&liPerformanceCount); 
double dTime = double(liPerformanceCount.QuadPart)/double(m_liPerformanceFrequency.QuadPart);