The central code loop responsible for handling the running gameplay. At its most basic state, it accepts input, resolves the actions of entities, and renders the scene.

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10
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4answers
3k views

Is a separate thread for game loop compulsory for simple games?

I am new to game development. In order to learn I am recreating this game on android platform. You can observe the game-play video at the above link. It is a simple game. I have read a lot of ...
2
votes
1answer
5k views

Game Update in Libgdx

In libgdx, the game loop is the render() method. But why is that, and is there a way where I can make an update() method that is called 60 times a second? As in the update() method, I would add the ...
1
vote
3answers
122 views

Why is my FPS computation yielding higher numbers than I expect?

I have following code: void Game::execute() { isExit = false; init(); double dt = 1.0 / 60.0; boost::timer timer; double accumulator = 0.0; boost::timer fps_timer; int ...
1
vote
3answers
1k views

Delta times and frame lag in the game loop

Let's say we have a standard gameloop like this, in pseudocode: while (true) { dt = GetDeltaTime(); Update(dt); Render(); } Here Update(dt) either uses a true variable timestep, or it ...
5
votes
2answers
889 views

Why is my gameloop slightly faster than 60 per second?

Here is my gameloop (taken from http://www.koonsolo.com/news/dewitters-gameloop/) which is supposed to limit the game (logic) updates to 60 per seconds and render as fast as the device allows: long ...
0
votes
3answers
940 views

How can I avoid a busy-wait in this game loop implementation?

I've been developing a small framework for OpenGL and WinApi for some research purposes. My biggest problem right now is the game loop. Simplified I did something like this: Main thread: HANDLE ...
1
vote
0answers
362 views

iOS OpenGLES - Multithread Game loop - Render and Update

I am trying to implementing multi-threaded game loop in iOS. (Actaully, two thread - Render and Update) This is my structure. Update Loop Has logic and at the end of loop, save update state. ...
4
votes
2answers
1k views

HTML5 game fps render lag

I am currently creating a flappyBird-like HTML5 game using Proccessing.js You can see current work here: http://files.tips4design.com/flappySlothRelease/ The problem is that even though the FPS is ...
2
votes
1answer
337 views

Why game loop should be running on a separate thread?

I am struggling to fully understand the responsiveness argument suggesting to run the game loop on a separate thread other than main thread. When OS sends a user event (touch, mouse move, etc.) it ...
4
votes
1answer
110 views

Dealing with interpolation and object creation/destruction

I've implemented a game loop similar to that in Glenn Fiedler's Fix Your Timestep! article. I have an update step running at 50Hz and a render step running at 60Hz (monitor refresh rate). To keep ...
0
votes
1answer
524 views

moving first person camera with the mouse on right click

I am new to game development and I am trying to get the game input working. I have successfully got all the movement keys for walking/running/looking around working; however, I am having a terrible ...
1
vote
1answer
713 views

Game Loop: Best way to limit the fps? [duplicate]

My game-loop looks like this: public void run() { init(); final double amountOfTicks = 60.0; double ns = 1000000000.0 / amountOfTicks; long ...
2
votes
1answer
396 views

does order of updates and renders matter?

I know in a game loop there needs to be an order like physics should update before rendering. So, I have created two separate functions: update and render and the game loops like below: ...
2
votes
2answers
733 views

Physics engine deltaTime and force acceleration

I am working on a physics engine that uses basic Euler integration to compute forces. So, here is the thing: function applyForce (rigidbody, force) { rigidbody.forces.add(force); } function ...
0
votes
0answers
228 views

Server Character Movement calculation

I am creating the movement function for an 3D MMO game server. It seems that I cant no get the position calculation to match the client and was wondering the best way to do this. Let me explain. The ...
2
votes
1answer
1k views

Implement an upper FPS limit in the gameloop

I implemented my game-loop as described in deWiTTER's article, using the last approach with an unlimited FPS and a constant game-speed. My problem is, that the unlimited FPS cranks up my CPU usage to ...
1
vote
2answers
175 views

Should the game update loop compensate for slowness

I am building a game engine and considering the design for the core game loop that will drive the game. In the most basic form, the implementation looks similar to this (in pseudo-code): while ...
21
votes
2answers
11k views

What is the standard C# / Windows Forms game loop?

When writing a game in C# that uses plain-old Windows Forms and some graphics API wrapper like SlimDX or OpenTK, how should the main game loop be structured? A canonical Windows Forms application has ...
1
vote
1answer
411 views

Python game loop approach?

I intend to write a game in Python and, later, if needed, offload any performance-critical sections of code to C++. I want to use Python basically because I am really familiar with the language and I ...
-1
votes
1answer
304 views

why are there draw rate and update rate in fixed time step game loop?

http://www.gameprogblog.com/generic-game-loop/ Java boolean onLoop( Game game, GameState state, GameInput input, Graphics2D gr ) { long nanosElapsed = state.tick(); updateTime += nanosElapsed; ...
1
vote
2answers
309 views

LUA - Keeping track of game state for a digital card trading game

I am building a card game. Let's say it's similar to Magic the Gathering, Hearthstone, etc. The problem I am trying to figure out is how to architect "auras" and how much damage each card takes. ...
23
votes
4answers
2k views

What is the point of “delta” in this code? Does it reflect a standard thing in game dev?

I know very little about game programming but would like to learn more. I am trying to understand the code for this game. I am trying to understand why the code is passing a "delta" to ...
1
vote
2answers
566 views

Cocos2d: Moving background on update: offsett issue

working with Objective C, iOS and Cocos2d I am developing a vertical scrolling shooter game for iPhone (retina display models with 640 width x 960 height pixel resolution). My basic algorithm works ...
1
vote
2answers
217 views

Input of mouseclick not always registered in XNA Update method

I have a problem that not all inputs of my mouse events seem to be registered. The update logic is checking a 2 dimensional array of 10x10 . It's logic for a jewel matching game. So when i switch my ...
1
vote
0answers
273 views

Delay command execution over sockets

I've been trying to fix the game loop in a real time (tick delay) MUD. I realized using Thread.Sleep would seem clunky when the user spammed commands through their choice of client (Zmud, etc) e.g. ...
4
votes
1answer
270 views

How to manage sleep/awake state of physics body

I have a loop, which updates all the physics, inside the loop I'm updating the position of the objects, first thing is the gravity, which pulls all the objects to the bottom. Now my question is, how ...
0
votes
1answer
366 views

Framerate and game loop on mobile

I'm searching how to manage game framerate on mobiles devices, here is my problem: On a computer with got something like that: void main() { while(game.isRunning()) { ...
5
votes
1answer
273 views

Game Logic Update Order

Is there a commonly-accepted general approach to the order of processing logic updates? My current 2D platformer has objects that implement different concerns, including the following: Notifiable - ...
3
votes
3answers
162 views

Should I use select() for networking in my gameloop?

I'm writing a simple networked game in C/C++. To keep things simple I'm using TCP. In my server's game loop I'm using a POSIX select() with a zero second timeout for two things: Discover incoming ...
0
votes
1answer
3k views

How to use C++11 chrono header for a clock

In first, sorry for my bad english. :) I'm making a game using SFML and C++11 new features, but I've got a problem with my custom Clock class (made to replace the SFML one). When I get the elapsed ...
2
votes
0answers
180 views

Game Loop on Server [closed]

I'm writing a simple mobile game with the following requirements: Server needs to update all active games at frequent and regular interval (i.e. I need a game loop running on a server but the update ...
0
votes
2answers
235 views

declaring variables in a render/game loop: good idea or bad?

I was just wondering how most of you like to declare your variables: for a variable you know will be used and changed frequently (i.e. every frame), do you declare those outside of the loop and simply ...
5
votes
4answers
4k views

Game loop on windows

I have seen different "basic" game loops both from books like "Introduction to 3D game programming with DX11" or online tutorial ( Rastertek ) and if we take off all the fancy stuff to control ...
2
votes
1answer
289 views

Implementing a time scale in game with fixed physics update

I'm currently putting together my game loop based on the "Fix Your Timestep" article at gafferongames.com. This is going fine, but I'm also trying to implement a 'time scale', i.e. a way to control ...
2
votes
2answers
852 views

Why do my update and draw loops throw a concurrent access exception?

I've taken up the challenge of creating a basic 2D side-scrolling monster truck game for my little brother. It seems easy enough in theory, but jumping into Java out of XNA feels strange. My game ...
1
vote
1answer
558 views

How should I invoke a physics engine?

I'm new to writing games. I'm planning to write a 2D battle game which may require an physics engine. Suppose I've written one, but how can I combine it with the main routine of my game? Should I ...
1
vote
1answer
476 views

Mixing Objective-C and C++: Game Loop Parts

I'm trying to write all of my game in C++ except for drawing and game loop timing. Those parts are going to be in Objective-C for iOS. Right now, I have ViewController handling the update cycle, but ...
3
votes
2answers
1k views

How to implement the server-side game loop?

The server needs to handle the physics, because all the movement will be handled by it. So for that I need a game loop. The thing is that the server doesn't have the render part, it's just a console. ...
0
votes
1answer
133 views

either use a for loop or iterator for the List of sprites for loop Optimization in libgdx

I am making and there I am making a frequent use of java.util.ArrayList for enemies, coins and shots. Is there any other utility in libgdx better than this from the Performance point of view. ...
0
votes
2answers
198 views

Serious gameplay issue by spawning enemies according to elapsed time

EDIT: I have changed the title as I think that this is a general gamedevelopment question but, on a technical note, I am using Cocos2d v2.0 Some time ago I had asked a question on which was the most ...
1
vote
1answer
125 views

Picking game entities

What is the preferred methods for doing so, performance-wise? For example I want to pick certain objects in an area around a given point. What I have thought off so far is using invisible objects as ...
1
vote
2answers
215 views

Game loop delta, factoring execution time?

Was thinking this morning, I 99.9% of the time, only see a main game loop, looking like this, just as much so where the delta is passed into update(): while running getDeltaTime() ... f(deltatime) ...
-2
votes
1answer
429 views

How to add difficulty levels to a Guess The Number game using rand()? [closed]

User guesses a random number (between 1 and 100 or 5000 and 25,000 depending on difficulty) that the computer picks. User selects difficulty from list, difficulty (1, 2, 3, 4) is assigned to int ...
0
votes
1answer
535 views

Removing drawn Allegro texts and primitives

I'm working on a game with Allegro 5 that has a loop. I'd like to make the program write onto the screen, how much time the loop has ended. These are the rounds of a turn-based game, obviously. I use ...
1
vote
0answers
129 views

Accessing variables from non-neighbouring classes specifically in game development (Android) [closed]

Edit Using direct access while breaking the law of demeter looks like this: res.sprite.drawQuad(res.sprite.xScreen,res.sprite.yScreen, mMVPMatrix); Using proxy methods / getters / setter looks ...
-1
votes
1answer
339 views

Get distance between the edge of screen and a moving sprite

How to get the distance between the edge of the screen and a vector moving sprite? I want to get the distance between my moving sprite and the edge of the screen so that when my sprite touches the ...
0
votes
2answers
787 views

Android Loop : Draw Loop : How to pull off smooth FPS?

I am writing 2D side scrolling bullet hell-like game. I am at a point where I struggle to pull off smooth fps. I have separated loop that manages drawing. However I want update the position of ...
0
votes
6answers
1k views

Avoiding constant IF checks for loops

As an example, I have 3 different loops that are executed in certain conditions. I want to know if there's any way short of something like this: if(day) x++; else if(night) y++; else z++; ...
6
votes
1answer
1k views

Android game loop's effect on cpu/battery usage - unexpected results

I will try to keep this question as concise and as readable as I can. I recently came across an odd problem with my Android game that I'm developing. It's an openGL ES 2.0 game and initially I was ...
2
votes
1answer
270 views

How to implement a multi-platform Java 2D game engine's graphics?

I'm not sure whether this question should be posted here. I'm trying to make a basic generic game engine in Java. Here's what I have so far. public abstract class Device { public abstract void ...