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游戏开发：如何限制FPS？

发布于 2024-09-07 02:27:15 字数 201 浏览 3 评论 0原文

我正在编写一个游戏，我看到 FPS 算法无法正常工作（当他必须计算更多时，他会睡更长的时间......）所以，问题很简单：如何计算具有正确 FPS 的睡眠时间？

我知道以微秒为单位更新游戏一帧需要多长时间，当然还有我想要达到的 FPS。

我正在疯狂地寻找一个简单的例子，但我找不到......

代码可能是Java、C++或伪代码......

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送你一个梦 2024-09-14 02:27:15

渲染一帧应花费的时间为 1/FPS 秒（如果您的目标是 10 FPS，则应在每一帧上花费 1/10 = 0.1 秒）。因此，如果渲染需要 X 秒，您应该“休眠”1/FPS - X 秒。

例如，将其转换为毫秒，您会得到

ms_to_sleep = 1000 / FPS - elapsed_ms;

如果由于某种原因花费了超过 1/FPS 来渲染帧，您将获得负睡眠时间，在这种情况下，您显然只是跳过睡眠。

The time you should spend on rendering one frame is 1/FPS seconds (if you're aiming for, say 10 FPS, you should spend 1/10 = 0.1 seconds on each frame). So if it took X seconds to render, you should "sleep" for 1/FPS - X seconds.

Translating that to for instance milliseconds, you get

ms_to_sleep = 1000 / FPS - elapsed_ms;

If it, for some reason took more than 1/FPS to render the frame, you'll get a negative sleep time in which case you obviously just skip the sleeping.

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嘿看小鸭子会跑 2024-09-14 02:27:15

每帧的微秒数为1000000/frames_per_second。如果您知道您已经花费了 elapsed_microseconds 进行计算，那么您需要睡眠的时间为：

(1000000 / frames_per_second) - elapsed_microseconds

The number of microseconds per frame is 1000000 / frames_per_second. If you know that you've spent elapsed_microseconds calculating, then the time that you need to sleep is:

(1000000 / frames_per_second) - elapsed_microseconds

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零度℉ 2024-09-14 02:27:15

尝试...

static const int NUM_FPS_SAMPLES = 64;
float fpsSamples[NUM_FPS_SAMPLES]
int currentSample = 0;

float CalcFPS(int dt)
{
    fpsSamples[currentSample % NUM_FPS_SAMPLES] = 1.0f / dt;
    float fps = 0;
    for (int i = 0; i < NUM_FPS_SAMPLES; i++)
        fps += fpsSamples[i];
    fps /= NUM_FPS_SAMPLES;
    return fps;
}

...按照 http://www.gamedev .net/community/forums/topic.asp?topic_id=510019

Try...

static const int NUM_FPS_SAMPLES = 64;
float fpsSamples[NUM_FPS_SAMPLES]
int currentSample = 0;

float CalcFPS(int dt)
{
    fpsSamples[currentSample % NUM_FPS_SAMPLES] = 1.0f / dt;
    float fps = 0;
    for (int i = 0; i < NUM_FPS_SAMPLES; i++)
        fps += fpsSamples[i];
    fps /= NUM_FPS_SAMPLES;
    return fps;
}

... as per http://www.gamedev.net/community/forums/topic.asp?topic_id=510019

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