Asteroids test task for ZeptoLab.
The game was created and compiled in Visual Studio 2015.
Tested on:
- nVidia Shield Tablet.
- Nexus 4.
- x86 Emulator.
- ARM Emulator.
The code is written in C++11. While I was creating the game I created several mini libraries to help in the development of the game which later on I open sourced, you can find them all in my github account (http://github.com/arajar).
The game features:
- Full shader based OpenGL ES 2 renderer.
- Read files from within the APK package (http://github.com/arajar/android_file_utils)
- Vector Math library (http://github.com/arajar/math).
- Header-only Entity Component System micro framework (http://github.com/arajar/ecs).
- Custom BMP loader.
- Particle Systems.
- Game States.
- Procedural Asteroid generator: all the asteroids are generated with different shapes.
- Two virtual joystics, one for movement and another one for shooting. Twin stick action!
I used the entity-component-system extensively to control all the aspects of the game:
- Spawn System: Checks that there are enough asteroids on the world and spawns new ones.
- Collision System: Super fast collision detection using spheres, checks if the entities are colliding with each other.
- Movement System: Takes the current position, direction and speed and moves the entities. Also checks the limits of the screen and moves the entities accordingly.
- Shoot System: Checks if the minimum time between shoots has passed and then creates missiles that point in the current direction of the player's ship.
- Render System: Creates the needed transformation matrixes for every entity and renders them.
- Debug Render System: Used to help debug the collision and shoot system, renders debug spheres around the entities.
The code is organized in two main folders:
- framework: where the "engine" is located. There is no gameplay code here.
- ecs: the header-only entity component system micro framework.
- graphics: utility classes to load textures and shaders.
- input: virtual joysticks.
- math: my vector math library.
- particles: the particle systems.
- states: game state manager.
- util: some utility classes (singletons, circual arrays, tweeners and file handling).
- game: where all the game code is located.
- entities: all the needed components and systems for the game.
- states: menu and gameplay states.
- util: utilities to create 2d shapes (asteroids, ship, missiles and circles).
I enjoyed a lot the creation of this game, and if it's ok with you I would love to open source it on Github and maybe continue working on the game.
While creating the game I identified some optimizations for future updates:
- Batching all the particles, asteroids and missiles.
- Binding the shaders only per type of entity.
And also new features, like postfx or more types of particle systems.
Luis.