Engine-design related questions. How code is structured.

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2
votes
1answer
65 views

Mixing old and new state of game objects?

If I have a group of game objects that are being updated each frame, and some of them query each others data like position and such, is it common practice to not care that a game object might get ...
41
votes
7answers
4k views

How can I set up a flexible framework for handling achievements?

Specifically, what is the best way to implement an achievement system flexible enough to handle going beyond simple statistics-driven achievements such as "kill x enemies." I'm looking for something ...
0
votes
0answers
21 views

How can I avoid duplication of jBox2D physics attributes?

I'm using jBox2D for physics and collision detection in a game engine with an entity-component system. It works, but I'm unsure how to structure my code with respect to the values represented in the ...
0
votes
2answers
244 views

Component based architecture: “pure” or some inheritance?

(I asked a similar question, but it had more questions inside it and I feel it wasn't clear enough, so I'm opening a new one). Until recently I implemented all my games using an inheritance ...
0
votes
0answers
21 views

Component systems: No inheritance hierarchy at all, or a basic one? [duplicate]

(I asked a similar question, but it had more questions inside it and I feel it wasn't clear enough, so I'm opening a new one). Until recently I implemented all my games using an inheritance ...
7
votes
3answers
257 views

How do AI agents access information about their environment?

This might be kind of a trivial question, but I am having trouble understanding this. Would very much appreciate your help. In game development using object oriented design, I want to understand how ...
2
votes
2answers
81 views

What is the advantage of wrapping D3D in a class versus a namespace?

Almost all the tutorials and books use a class wrapper for Direct3D. But I haven't found any scenario in which using more than one instance of Direct3D system (the "device" and state, et cetera) is ...
11
votes
3answers
730 views

Does Unity have existing support for Timelines?

I am planning the development of a game in Unity3D, and trying to come to terms with what the engine has already provided, and what I must code myself. The game itself is going to be a rhythm game, ...
9
votes
1answer
1k views

How to benefit from cpu cache in a entity component system game engine?

I often read in the ECS game engine documentations that is a good architecture for using cpu cache wisely. But I can't figure how we can benefit from cpu cache. If components are saved in an array ...
0
votes
2answers
160 views

Best practice for handling “dead” objects and their particles

I'm developing a side-scrolling run'n'gun game (but with planes! :P). I'm an experienced coder, but new to game development. When an enemy plane collides with a friendly missile, I start an explosion ...
-1
votes
1answer
528 views

Distributed Multiplayer Game Server Architecture [closed]

I'm programming a multiplayer game for mobile phones.I'm working on a distributed server architecture for handling lots of concurrent players. Here is my architecture on my mind: Some questions ...
7
votes
1answer
256 views

Optimize state changes within a render queue

I am refactoring some parts of the game engine I am working on. This engine is made in C# with XNA. The part I have trouble with is shader/material and the render queue. In the new version I will ...
84
votes
3answers
29k views

Tips for writing the main game loop? [closed]

Can anyone recommend some good tips, articles, sites, etc. for writing the main game loop? What are some things that you should do in the game loop, and what are some things that you shouldn't do in ...
6
votes
5answers
1k views

What is Java missing that might make it difficult to develop fully-featured 2D games?

Without using any external libraries, does Java, including all officially supported APIs give you enough to develop fully-featured 2D games? The reason I ask is that I hear a lot of "bad-mouthing" ...
-2
votes
2answers
137 views

Should collision sounds and UI responses be deferred or processed immediately?

When checking for collisions between entities, should you play a collision sound immediately on discovering a collision or queue every collision and process the sounds later? Similarly for user user ...
0
votes
1answer
71 views

How are vertices determined complex geometries in an ever changing game state

For example say you wanted to draw a 3D cube you can define an array of hard coded vertices using float3, here is an example. http://msdn.microsoft.com/en-us/library/windows/desktop/jj552949.aspx But ...
5
votes
2answers
2k views

Component based game engine and dependencies - singletons [closed]

I am thinking about how to create component based game engine. I understand that all things should be very similar as in Data Oriented Design (each object is a collection of various structures as ...
43
votes
8answers
11k views

Event-driven Communication in a Game Engine: Yes or No?

I am reading Game Coding Complete and the author recommends Event Driven communication among game objects and modules. Basically, all living game actors should communicate with the key modules ...
0
votes
1answer
121 views

When entities don't draw themselves, who actually does?

There are countless questions here about whether entities should draw themselves or not. The answer is almost universally no, there should be a renderer. And I do see a point in having a single place ...
2
votes
3answers
2k views

How do I code a 2D tile map? [closed]

I'm new to game development and I want to know how to create a tile map. The map should be divided into squares, such that each square represents a location like x : 10, y : 10. The width and height ...
6
votes
3answers
2k views

How to avoid “Blob-Systems” in an entity component system?

Currently I am facing the following problem: I am trying to write a pong clone by using an entity component system (ECS). I wrote the "framework" all by myself. So there is a class which manages ...
1
vote
1answer
322 views

Adjusting server-side tickrate dynamically

I know nothing of game development/this site, so I apologise if this is completely foobar. Today I experimented with building a small game loop for a network game (think MW3, CSGO etc). I was ...
5
votes
1answer
433 views

How do you parameterize turn based AI?

I would like to create/find an AI algorithm/process that can be parameterized such that a change in the parameters causes a change in the AI behavior. I am specifically looking to apply this to a turn ...
0
votes
2answers
2k views

I need an enemy spawning algorithm for a 2D tower defense

I need an enemies spawning algorithm for a 2D tower defense game. I have 4 maps, each has 4 stages and each stage has 40 rounds. I need to create an algorithm which will instantiate waves, increase ...
5
votes
2answers
232 views

Is having a master builder object a bad idea?

I have wondered about using the following approach to creating Entity objects in a personal project. What I want is to be able to keep track of all Entity objects that get created, so whenever an ...
9
votes
2answers
752 views

Should the content pipeline tools be embedded in the engine?

How minimal should a games engine be? How much of the content pipeline should be embedded in the engine? Some use cases where the super engine might be useful: When loading user content, the user ...
1
vote
2answers
181 views

Circular dependency when creating entities

I have the following problem: I have a a class called Stage, that keeps an list of entities, which it iterates over every update loop, and updates them. One of these entities might be a weapon (PEW ...
2
votes
3answers
209 views

How do I implement Breakout's “multiball” powerup?

I'm just starting out and making a breakout clone as my first game. I'm implementing all kinds of powerups, but I'm stuck on multiball. The powerup adds additional bouncing balls to the game. So far, ...
1
vote
1answer
1k views

How should I handle animation states in Mecanim?

I did a tutorial which associated an integer to each state and manually set transitions from one state to another based on that integer, but that seems really sloppy. Is there a more elegant way? I ...
0
votes
1answer
223 views

How to architect collision detection in SFML

I have a pretty simple game engine that I'm making for a 2d platformer game. I don't want it to be super advanced, but it does have some basic properties. Most important to this question is a class ...
0
votes
1answer
175 views

Representing multi-tile objects in a tilemap

I'm building an isometric tiled game, where the terrain and objects are represented by a 2-dimensional array of lists. Depth of objects on the map is derived from the tile (and a per-tile sorting ...
0
votes
0answers
61 views

How can I position different size creatures in a group automaticly

I'm doing a game (in xna) on my free time, as I'm not in the game market, I'm pretty sure I'm missing something that would help me get this right. Think of Ogre Battle. A group of unit moves, and ...
2
votes
1answer
228 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 ...
3
votes
4answers
1k views

How to make a game without OOP? [closed]

I am currenty studying game development and practicing making games. I use a lot of OOP in my games. For example, each missile that is shot is an instance of a Missile object, and added to a list of ...
3
votes
3answers
895 views

Event/Trigger System Architecture

The Plan I am up to write write an own Trigger/Event System, an event engine or how you call it. I would like to achive something similar to Blizzard's most level editors, like Starcraft 1-2, ...
2
votes
2answers
139 views

Materials and Mesh association

I'm trying to implement a Material system in a small engine for training and I've got questions about materials. Currently I've got that: Material: A Material with array of Technique Technique: ...
2
votes
1answer
103 views

Where should the collision response/resolution code go?

I've got a collision response/resolution function that does the same for any pair of two entities. It's is in the World class right now. But right before that function is invoked, I have some ...
0
votes
2answers
197 views

Manage shader parameters

I'm making some test with OpenGL and I've got a problem with my application design. Currently, I've got something like that in pseudo code: // Ask to draw a given scene. renderer->drawScene( ...
1
vote
0answers
65 views

Designing & Implementing a generic actions & communication system [closed]

I'm currently in the process of redesigning the action/communication/sound system of some small game. This part currently handles characters speech and emotes. The game itself allows for a lot of ...
1
vote
1answer
71 views

Swapping function definitions at runtime

I am developing an cross-platform game-engine with a friend using C++, OpenGL ( 2 + 4 ) and some other Low Level API provided by the platform. So far we've finished window initalisation and some ...
0
votes
1answer
226 views

How to implement status-changing effects for attack class in turn based RPG?

I'm implementing "On Attack" and "On Receive Damage" within my game and from these two answers(Implementing flexible buff system,Implementing attack class in RPG ) I got that I will be implementing ...
1
vote
1answer
164 views

How do I keep user input and rendering independent of the implementation environment?

I'm writing a Tetris clone in JavaScript. I have a fair amount of experience in programming in general, but am rather new to game development. I want to separate the core game code from the code that ...
1
vote
1answer
72 views

How do I implement references or relations for entities within a serialized savegame?

I have a 2D tile based RPG for which I'm developing save game function. In particular, I'm trying to save this structure: A caster can have multiple buffs that he maintains. Each buff can have ...
2
votes
2answers
142 views

Should widgets be part of a scene in a 2D game?

I'm in the middle of separating logic and drawing of a 2D game, i.e. I'm moving from scenes/entities that draw themselves to scenes/entities that merely store and update data, getting drawn by a ...
3
votes
2answers
201 views

How can I organise the code for an episodic game?

We're working on a game that's going to be split into three episodes, which we'll release one after another as they get finished. I'm worried that our typical somewhat monolithic architecture is not a ...
6
votes
4answers
293 views

Should references between assets be handled by name or ID or something else?

How should content or asset items be referenced in their serialized form? For example, a material might need to reference several textures. The simplest way would be to use a path, relative to the ...
1
vote
0answers
232 views

Game editor architecture [closed]

I'm looking in to developing a game editor - essentially a level editor for my game but a little more advanced i.e edit menus and loading screens and what not. So far, I have come up with a ...
1
vote
2answers
142 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 ...
2
votes
0answers
196 views

How do you deal with loot in an RPG where all mosters drop their full inventory? [closed]

I currently have a system where both players and monsters in an RPG use equipment. This means that when an enemy is killed, I can technically drop everything they have. These are armor and weapons ...
18
votes
3answers
1k views

How to create a Ghost Replay feature in a game?

When you set a personal best lap time in a console racing game, you have the option to compete against your ghost. How can this feature be created for a single player casual type game?