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The game loop is the heartbeat of every game, no game can run without it. But unfortunately for every new game programmer, there aren’t any good articles on the internet who provide the proper information on this topic. But fear not, because you have just stumbled upon the one and only article that gives the game loop the attention it deserves. Thanks to my job as a game programmer, I come into contact with a lot of code for small mobile games. And it always amazes me how many game loop implementations are out there. You might wonder yourself how a simple thing like that can be written in different ways. Well, it can, and I will discuss the pros and cons of the most popular implementations, and give you the (in my opinion) best solution of implementing a game loop.

(Thanks to Kao Cardoso Félix this article is also available in Brazilian Portuguese, and thanks to Damian/MORT in Polish)

The Game Loop

Every game consists of a sequence of getting user input, updating the game state, handling AI, playing music and sound effects, and displaying the game. This sequence is handled through the game loop. Just like I said in the introduction, the game loop is the heartbeat of every game. In this article I will not go into details on any of the above mentioned tasks, but will concentrate on the game loop alone. That’s also why I simplified the tasks to only 2 functions: updating the game and displaying it. Here is some example code of the game loop in it’s most simplest form:

The problem with this simple loop is that it doesn’t handle time, the game just runs. On slower hardware the game runs slower, and on faster hardware faster. Back in the old days when the speed of the hardware was known, this wasn’t a problem, but nowadays there are so many hardware platforms out there, that we have to implement some sort of time handling. There are many ways to do this, and I’ll discuss them in the following sections. First, let me explain 2 terms that are used throughout this article:

FPS: FPS is an abbreviation for Frames Per Second. In the context of the above implementation, it is the number of times display_game() is called per second.
Game Speed: Game Speed is the number of times the game state gets updated per second, or in other words, the number of times update_game() is called per second.

FPS dependent on Constant Game Speed

Implementation

An easy solution to the timing issue is to just let the game run on a steady 25 frames per second. The code then looks like this:

This is a solution with one huge benefit: it’s simple! Since you know that update_game() gets called 25 times per second, writing your game code is quite straight forward. For example, implementing a replay function in this kind of game loop is easy. If no random values are used in the game, you can just log the input changes of the user and replay them later. On your testing hardware you can adapt the FRAMES_PER_SECOND to an ideal value, but what will happen on faster or slower hardware? Well, let’s find out.

Slow hardware

If the hardware can handle the defined FPS, no problem. But the problems will start when the hardware can’t handle it. The game will run slower. In the worst case the game has some heavy chunks where the game will run really slow, and some chunks where it runs normal. The timing becomes variable which can make your game unplayable.

Fast hardware

The game will have no problems on fast hardware, but you are wasting so many precious clock cycles. Running a game on 25 or 30 FPS when it could easily do 300 FPS… shame on you! You will lose a lot of visual appeal with this, especially with fast moving objects. On the other hand, with mobile devices, this can be seen as a benefit. Not letting the game constantly run at it’s edge could save some battery time.

Conclusion

Making the FPS dependent on a constant game speed is a solution that is quickly implemented and keeps the game code simple. But there are some problems: Defining a high FPS will pose problems on slower hardware, and defining a low FPS will waste visual appeal on fast hardware.

Game Speed dependent on Variable FPS

Implementation

Another implementation of a game loop is to let it run as fast as possible, and let the FPS dictate the game speed. The game is updated with the time difference of the previous frame.

The game code becomes a bit more complicated because we now have to consider the time difference in the update_game() function. But still, it’s not that hard. At first sight this looks like the ideal solution to our problem. I have seen many smart programmers implement this kind of game loop. Some of them probably wished they would have read this article before they implemented their loop. I will show you in a minute that this loop can have serious problems on both slow and fast (yes, FAST!) hardware.

Slow Hardware

Slow hardware can sometimes cause certain delays at some points, where the game gets “heavy”. This can definitely occur with a 3D game, where at a certain time too many polygons get shown. This drop in frame rate will affect the input response time, and therefore also the player’s reaction time. The updating of the game will also feel the delay and the game state will be updated in big time-chunks. As a result the reaction time of the player, and also that of the AI, will slow down and can make a simple maneuver fail, or even impossible. For example, an obstacle that could be avoided with a normal FPS, can become impossible to avoid with a slow FPS. A more serious problem with slow hardware is that when using physics, your simulation can even explode!

Fast Hardware

You are probably wondering how the above game loop can go wrong on fast hardware. Unfortunately, it can, and to show you, let me first explain something about math on a computer. The memory space of a float or double value is limited, so some values cannot be represented. For example, 0.1 cannot be represented binary, and therefore is rounded when stored in a double. Let me show you using python:

This itself is not dramatic, but the consequences are. Let’s say you have a race-car that has a speed of 0.001 units per millisecond. After 10 seconds your race-car will have traveled a distance of 10.0. If you split this calculation up like a game would do, you have the following funct