如何调整游戏循环帧速率？ [英] How to adjust a game loop frame rate?
问题描述
我现在正试图编写我的第一个游戏在SFML（和我的第一个整体），但我遇到了问题，我得到一个口吃大约一秒钟。在这样的口吃时，Frametime是正常的3到4倍，真的很明显，因为我不运行真正高的FPS（300+）。
I'm at the moment trying to Programm my first Game in SFML (and my first overall) but i ran into the Problem that i get a stutter about once a second. During such a stutter the Frametime is 3 to 4 times higher than normal which is really noticeable as long i don't run really high FPS (300+).
没有问题（至少atm），因为效能不是问题，而是：
No Problem (at least atm) as performance is not an Issue, but:
运动方法真的很奇怪，并且移动方式慢，它应该做的。
When doing that my movement Method really freaks out and moves way way slower that it's supposed to do.
我的移动方法：
void Player::Update(float frametime){
mMovementSpeedTimefactor = frametime * 60 / 1000.0f;
setMovementVector(sf::Vector2f( mMovementVector.x * mMovementSpeedTimefactor, mMovementVector.y *mMovementSpeedTimefactor));
validateMovement();
//std::cout << mTestClock->restart().asMilliseconds() << std::endl;
moveObject();
this->updateAnimation();
}
frametime是以毫秒为单位的frametime，i乘以60，被设置为像素/秒的值而不是每帧。
frametime is the frametime in Milliseconds, and i Multiply by 60, as my movementspeed is set as a value for pixel/second and not per frame.
movespeed是5，所以字符应该每秒移动5像素，无论FPS（因此Frametime）我有。
movementspeed is 5, so the character should move 5 px per second, whatever FPS( and therefore Frametime) i have.
但是：这给了我真正的跳跃运动，因为那些stutterframes导致跳跃，并且在nto口吃帧，palyer移动比它应该慢得多。
But: that gives me really jumpy movement, as those "stutterframes" result in a jump, and on nto stuttering frames the palyer moves a lot slower than it should.
我的mainloop非常简单，只是
my mainloop is really simple, just
while(mMainWindow->isOpen()){
HandleEvents();
Update();
Render();
}
使用inbuild framelimiter（尝试写我自己的，同样的结果，只要我使用sf：sleep来调节FPS，没有cpu核心在100％负载运行）到300 FPS。
while using the inbuild framelimiter (tried writing my own, but i get the very same result, as long as i use sf:sleep to regulate FPS for not having the cpu core running at 100% load) to 300 FPS.
所以，我可以设置我的标准速度为1而不是5，但
setframeratelimit不是很准确，所以我得到一些变化的movespeed，我真的不喜欢。
So yeah, i could just set my standard speed to 1 instead of 5, but setframeratelimit is not very accurate, so i get some variation in movementspeed, that i really not like.
任何人都有一个想法，我最好做什么？也许我没有看到森林所有的树（我实际上不知道，如果你说英语：P），但因为这是我第一个游戏我没有经验回头看。
anyone has an idea, what i could best do? Maybe i'm not seeing the forest for all the trees ( i actually have no idea if you say that in english :P) but as this is my first game i have no experience to look back upon.
推荐答案
当 frametime 真的很高或真的很低时，由于浮动精度问题，工作正常。我建议设置标准速度，也许 500 和 mMovementSpeedTimeFactor 到 frametime * 60 / 10.0 f ，并检查问题是否仍然发生。
When frametime is really high or really low your calculations may not work correctly because of float precision issues. I suggest setting standard speed to, maybe, 500 and mMovementSpeedTimeFactor to frametime * 60 / 10.0f and check if the issue still happens.
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