计算帧每秒的游戏 [英] Calculating frames per second in a game

问题描述

什么是好的算法来计算帧每秒的游戏？我想它显示为一个数字在屏幕的角落。如果我只是看花了多长时间来渲染一帧的数量变化太快了。

What's a good algorithm for calculating frames per second in a game? I want to show it as a number in the corner of the screen. If I just look at how long it took to render the last frame the number changes too fast.

如果你的答案更新每个帧不收敛时，不同帧​​速率在增加VS减少。加分

Bonus points if your answer updates each frame and doesn't converge differently when the frame rate is increasing vs decreasing.

推荐答案

您需要一个平滑平均值，最简单的方法是采取目前的答案（时间绘制的最后一帧），并使用previous结合起来的回答。

You need a smoothed average, the easiest way is to take the current answer (the time to draw the last frame) and combine it with the previous answer.

// eg.
float smoothing = 0.9; // larger=more smoothing
measurement = (measurement * smoothing) + (current * (1.0-smoothing))

通过调整0.9 / 0.1的比例可以改变'时间常数' - 那就是如何快速地数响应变化。赞成老答案较大部分给出了一个更慢更流畅的变化，很大一部分有利于新的答案给出了一个快速变化的值。显然，这两个因素必须添加到一个！

By adjusting the 0.9 / 0.1 ratio you can change the 'time constant' - that is how quickly the number responds to changes. A larger fraction in favour of the old answer gives a slower smoother change, a large fraction in favour of the new answer gives a quicker changing value. Obviously the two factors must add to one!

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