Engine-design related questions. How code is structured.

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27
votes
3answers
2k views

Several classes need to access the same data, where should the data be declared?

I have a basic 2D tower defense game in C++. Each map is a separate class which inherits from GameState. The map delegates the logic and drawing code to each object in the game and sets data such as ...
1
vote
1answer
339 views

What is the logic behind a 3D Projection 'Camera Perspective'? [closed]

Suppose I had a 3D Cube on a 2D plane (screen). And I wanted to use the keypad to move and rotate it. Without referring to a 3D Game Engine that could do this for me can you explain me the logic or ...
0
votes
1answer
191 views

An API independent way of managing video memory?

I'm developing a game. The game architecture is very modular. I have a "Graphics Engine", which uses either a Direct3D or OpenGL renderer. However the user does not have access to the renderers ...
2
votes
1answer
164 views

Architechture problem of implementation of a tutorial for a game

I'm creating one for my game and I'm confused a bit. I made special TutorialManager class and a number of steps to pass for player first time entered the game. The problem is that tutorial steps are ...
2
votes
1answer
126 views

Timestamps as ids in an entity manager?

I've built my own entity manager, as I found out some days ago, it is very similar to the Artemis framework. For now, I just use integers as entity ids. Behind the scenes, there is a simple integer ...
5
votes
3answers
255 views

Mismatch of Entity System and Savegames

There is a theoretical mismatch of the entity system and the savegame system, which is think is common, but I haven't found resources about that. Therefore I will explain both systems first, as short ...
2
votes
2answers
376 views

Level Representation in a 2D Game

I would like to create a 2D game, where a character should move on a stage/level. My stage would be static, constructed some little cubes, similar to the well-known Mario game: some of the elements ...
2
votes
1answer
99 views

Using an FSM, how do you clean up state related attributes that may be used from several states?

I'm making a game that plays a bit like Diablo, but you can harvest resources like in an RTS. I have the following states in my FSM: IdleState, ApproachingTargetCoordinateState, ...
4
votes
2answers
254 views

Mobile Multiplayer games and coping with high latency

I'm currently researching regarding a design for an online (realtime) mobile multiplayer game. As such, i'm taking into consideration that latencies (lag) is going to be high (perhaps higher than ...
4
votes
4answers
289 views

Networking gampeplay - Sending controller inputs vs. sending game actions

I'm reading about techniques for implementing game networking. Some of the resources i've read state that it is a common practice (at least for some games) to send the actual controller input across ...
16
votes
5answers
3k views

noSQL - Is it a valid option for web based game? [closed]

Out of an opportunity and boredom, a friend and I decided to make a web based game. This is the first 'game' I will be making, since usually I program web apps in django. I've opted to use the same ...
3
votes
1answer
197 views

Whats the best way to expose current settings to your classes? [duplicate]

Just as the title states, whats the best way to expose current settings like resolution to my classes? (I know this might have been asked, but I couldn't find anything) I was thinking of the ...
-5
votes
1answer
219 views

Should I use reference counting on entities in component-based entity system? [closed]

In component-based entity system, should game objects be reference counted? What about components? Tell me please your pro and contra.
1
vote
0answers
120 views

Saving/loading code structure

I have a tree of game entities composed of components. I want to save/load everything to xml file, where my saving/loading code must be located: Scene class containing root node and functions ...
8
votes
3answers
664 views

Grouping entities of the same component template to linear containers

EDIT: Looks like people are actually doing this! http://www.randygaul.net/2013/05/20/component-based-engine-design/ Another example of using this data accesing pattern. I've done a lot of research ...
2
votes
1answer
97 views

How do I persist the states of distant objects?

How would one manage the state of static living things like trees in a large sandbox world? Trees in Minecraft, for example: They grow even when the player is far away. One way is to save them with a ...
1
vote
1answer
601 views

Entity-System Architecture; Pools and Factories

I'm creating a 2D game based on entity-system architecture using C++, the C++ port of Artemis, and SFML. I've had to jump through a few hoops, but it's been fairly smooth until now. In this game, I ...
11
votes
4answers
479 views

How to determine range of possible movement in turn-based, distance-based strategy game?

I'm creating a 2-dimensional, turn-based strategy game using c++ and SFML-2.0. Movement is distance-based rather than grid-based, with several different triangle-shaped pieces that, on a given turn, ...
1
vote
1answer
77 views

Sending entities to connecting player

When a player connects to a game, he needs to be sent all the entities currently on the map. This is done by creating entities one by one. Three ways of implementing this come into my mind. Which one ...
1
vote
1answer
244 views

Best Practices for class usage and game architecture

I'm making a 2D game similar to mario in Java. I have some questions about class organization and proper method usage. I have the following classes: Main: runs the game in a JFrame GamePanel: ...
22
votes
4answers
2k views

Appropriate level of granularity for component-based architecture

I'm working on a game with a component-based architecture. An Entity owns a set of Component instances, each of which has a set of Slot instances with which to store, send, and receive values. Factory ...
1
vote
3answers
1k views

Entity System creating Components

Over every entity system I see implemented in C++, or even in Java/C# (e.g. the Artemis framework). I see components not allocated via a new operator (or something similar, e.g. std::make_shared). For ...
17
votes
4answers
2k views

Game architecture / design question - building an efficient engine while avoiding global instances (C++ game)

I had a question about game architecture: What is the best way to have different components communicate with each other? I do really apologize if this question has already been asked a million times, ...
1
vote
1answer
136 views

Positioning sprites in a Component-Entity engine

I'm building my first component/entity engine and I'm not so sure about some of my choices. I'm here asking suggestions on my first doubt. I draw objects with 2 different behaviours: 1) Position ...
8
votes
3answers
312 views

Object of arrays or array of objects?

I'm making a management sim game, something along the lines of Roller Coaster Tycoon. I want to know what the best way to structure my world objects is so to maximise performance. Let's say I have ...
35
votes
5answers
3k views

How to avoid the GameManager god object?

I just read an answer to a question about structuring game code. It made me wonder about the ubiquitous GameManager class, and how it often becomes an issue in a production environment. Let me ...
10
votes
2answers
500 views

How do I make good guy attacks only hit bad guys and vice versa?

My game has many different type of good guys and many different type of bad guys. They will all be firing projectiles at each other but I don't want any accidental collateral damage to occur for ...
1
vote
2answers
1k views

References about Game Engine Architecture in AAA Games [closed]

Last weeks I focused on game engine architecture and learned a lot about different approaches like component based, data driven, and so on. I used them in test applications and understand their ...
3
votes
2answers
206 views

Important aspects to consider while making a technical design document

I'm working on a open world strategy game for which I'm planning to make technical design documentation. How do we decide exactly what we need to include to ensure the design document is as complete ...
4
votes
2answers
619 views

Allocating Entities within an Entity System

I'm quite unsure how I should allocate/resemble my entities within my entity system. I have various options, but most of them seem to have cons associated with them. In all cases entities are ...
0
votes
3answers
425 views

Rendering order in an Entity System

Say I use a basic ES approach, and also inside Systems I hold lists of all entities that Systems are required to process. How do I maintain this list of entities in desired rendering order, i.e. for ...
0
votes
0answers
120 views

Resource/Asset Manager [duplicate]

I'm creating a ResourceManager. At the beginning i'm creating a groups of resources which contain a map of resources. The role of groups is to quick load/unload resources, to find some constant, never ...
25
votes
4answers
1k views

If two objects interact, what holds the interaction code?

Think of a bullet and an enemy, or the player and the floor. If these objects interact, what holds the interaction code?
2
votes
3answers
244 views

Desire advice on implementing this animation timeline system

I have read a lot of questions on here, as well as books regarding game architecture. I have a general question about the implementation of a game's animation timeline, on which many isolated ...
88
votes
9answers
9k views

Entity communication: Message queue vs Publish/Subscribe vs Signal/Slots

How do game engine entities communicate? Two use cases: How would entity_A send a take-damage message to entity_B? How would entity_A query entity_B's HP? Here's what I've encountered so far: ...
87
votes
11answers
13k views

Good resources for learning about game architecture?

Are there any good resources for learning about game architectures? I am looking for high level overviews of different architectures. I tend to find information about the various pieces of a game such ...
4
votes
2answers
695 views

Manage VBO/VAO in a graphic engine

I'm trying to make a 2D Graphic engine for training me. I've actually made it with immediate draw and I've made the renderer outside (so I can switch between OpenGL and DirectX). How can I manage ...
1
vote
1answer
88 views

How can I implement something like Destiny's public events?

Bungie has shown a gameplay trailer for their new game, Destiny. The part that really stood out for me was the 'public events' that can happen randomly while playing. Now I've thought about it for a ...
3
votes
1answer
151 views

simple adventure game mechanics stored in database

I plan to code a little adventure-like game. To be able to build multiple episodes without deploying new code I want to store any information possible in the database. This includes stuff like ...
15
votes
6answers
3k views

Do you actually use diagrams to model games? [closed]

I mean mostly UML but any method that works is viable. So - do you actually model your games with UML/other diagrams or different methods? I had a subject at my university about modelling with UML and ...
2
votes
1answer
590 views

Movement & Physics in an entity-component system

I'm currently playing around with entity-components systems and got started on the movement/collision/physics parts and would like to have some pointers! It's a basic 2D sidescrolling game, with the ...
1
vote
1answer
110 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 ...
2
votes
1answer
277 views

Combining 2D and 3D in game engine

I've implemented basic 3D functionality and made little "2.5D" demo in orthographic projection using OpenGL ES 2 and Box2D. Now I want to make completely two-dimensional game (using sprites) and ...
0
votes
1answer
68 views

Object generation from an existing object in a game engine

To simplify, let's say in en engine I'm coding for a game, I have the Main class an Object class. In the Main class' update method, I loop through the array of all Objects in the game. I also have a ...
2
votes
2answers
2k views

OpenGL - Understanding the relationship between Model, View and World Matrix

I am having a bit of trouble understanding how these matrixes work and how to set them up in relation to one another to get a proper system running. In my understanding the Model Matrix is the matrix ...
0
votes
0answers
331 views

Component based architecture - Rendering approach?

I'm planning to use a component based architecture for a new 3D game engine I plan to work on, however I don't know how to approach the rendering side of things. I can see two options here: Every ...
1
vote
0answers
44 views

Export matrices or IPOs?

I'm currently working on an exporter for Blender and corresponding importer for my engine, but I believe the same concepts apply to any other 3D animation software. When it comes to export animation ...
1
vote
1answer
170 views

When to use GameComponents?

I know what it is and I'm using it as a frame counter for example. But when should I use it? Does it make sense to say "I make all the input handling happen in a gamecomponent"? Is it flexible enough ...
1
vote
2answers
585 views

How to make a “GUI In Game”?

My game is very GUI based, the way how it works is that I have a GUI class, which contains the basic GUI elements, a parent GUI object, and a copy of the main game's class object. The game starts out ...
2
votes
1answer
259 views

Where to put common System functionality in Entity-System Design?

I am working on an Entity System design based largely off of Adam Martin's design and Ray Wenderlich's Objective-C Implementation. I am working on the AI system using a state machine with a System ...