我正确计算我的FPS吗？ [英] Am I calculating my FPS correctly?

问题描述

所以我想知道我是否正确计算我的FPS：

  Uint32 delayFrom（float startTime，float endTime）{ 
 return（endTime  -  startTime）; 
} 
 
 
 int main（）{
 int numFrames = 0; 
 Uint32 startTime = SDL_GetTicks（）; 
 while（！done）{
 frameTime = 0; 
 float fps =（numFrames /（float）（SDL_GetTicks（） -  startTime））* 1000; 
 cout<< fps<< endl; 
 SDL_Delay（delayFrom（frameTime，1/60））; 
 ++ numFrames; 
} 
} 
  

解决方案

p> int main（）{
int numFrames = 0;
Uint32 startTime = SDL_GetTicks（）;
while（！done）{
++ numFrames;
Uint32 elapsedMS = SDL_GetTicks（） - startTime; //从循环开始的时间
if（elapsedMS）{//跳过第一帧
double elapsedSeconds = elapsedMS / 1000.0; // Convert to seconds
double fps = numFrames / elapsedSeconds; // FPS is Frames / Seconds
cout<< fps<< endl;
}
SDL_Delay（1.0 / 60.0）; //使用浮点除法而不是整数
}
}


So I was wondering if I'm calculating my FPS correctly:

Uint32 delayFrom(float startTime, float endTime){
    return(endTime - startTime );
}


int main(){
    int numFrames = 0;
    Uint32 startTime = SDL_GetTicks();
    while(!done){
        frameTime = 0;
        float fps = ( numFrames/(float)(SDL_GetTicks() - startTime) )*1000;
        cout << fps << endl;
        SDL_Delay(delayFrom(frameTime, 1/60));
        ++numFrames;
    }
}

解决方案

int main() {
  int numFrames = 0;
  Uint32 startTime = SDL_GetTicks();
  while (!done) {
    ++numFrames;
    Uint32 elapsedMS = SDL_GetTicks() - startTime; // Time since start of loop
    if (elapsedMS) { // Skip this the first frame
      double elapsedSeconds = elapsedMS / 1000.0; // Convert to seconds
      double fps = numFrames / elapsedSeconds; // FPS is Frames / Seconds
      cout << fps << endl; 
    }
    SDL_Delay(1.0/60.0); // Use floating point division, not integer
  }
}

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