Game Engine Skill
Build web-based games and game engines using HTML5 Canvas, WebGL, and JavaScript. This skill includes starter templates, reference documentation, and step-by-step workflows for 2D and 3D game development with frameworks such as Phaser, Three.js, Babylon.js, and A-Frame.
When to Use This Skill
- Building a game engine or game from scratch using web technologies
- Implementing game loops, physics, collision detection, or rendering
- Working with HTML5 Canvas, WebGL, or SVG for game graphics
- Adding game controls (keyboard, mouse, touch, gamepad)
- Creating 2D platformers, breakout-style games, maze games, or 3D experiences
- Working with tilemaps, sprites, or animations
- Adding audio to web games
- Implementing multiplayer features with WebRTC or WebSockets
- Optimizing game performance
- Publishing and distributing web games
Prerequisites
- Basic knowledge of HTML, CSS, and JavaScript
- A modern web browser with Canvas/WebGL support
- A text editor or IDE
- Optional: Node.js for build tooling and local development servers
Core Concepts
The following concepts form the foundation of every web-based game engine.
Game Loop
Every game engine revolves around the game loop -- a continuous cycle of:
- Process Input - Read keyboard, mouse, touch, or gamepad input
- Update State - Update game object positions, physics, AI, and logic
- Render - Draw the current game state to the screen
Use requestAnimationFrame for smooth, browser-optimized rendering.
Rendering
- Canvas 2D - Best for 2D games, sprite-based rendering, and tilemaps
- WebGL - Hardware-accelerated 3D and advanced 2D rendering
- SVG - Vector-based graphics, good for UI elements
- CSS - Useful for DOM-based game elements and transitions
Physics and Collision Detection
- 2D Collision Detection - AABB, circle, and SAT-based collision
- 3D Collision Detection - Bounding box, bounding sphere, and raycasting
- Velocity and Acceleration - Basic Newtonian physics for movement
- Gravity - Constant downward acceleration for platformers
Controls
- Keyboard - Arrow keys, WASD, and custom key bindings
- Mouse - Click, move, and pointer lock for FPS-style controls
- Touch - Mobile touch events and virtual joysticks
- Gamepad - Gamepad API for controller support
Audio
- Web Audio API - Programmatic sound generation and spatial audio
- HTML5 Audio - Simple audio playback for music and sound effects
Step-by-Step Workflows
Creating a Basic 2D Game
- Set up an HTML file with a
<canvas> element
- Get the 2D rendering context
- Implement the game loop using
requestAnimationFrame
- Create game objects with position, velocity, and size properties
- Handle keyboard/mouse input for player control
- Implement collision detection between game objects
- Add scoring, lives, and win/lose conditions
- Add sound effects and music
Building a 3D Game
- Choose a framework (Three.js, Babylon.js, A-Frame, or PlayCanvas)
- Set up the scene, camera, and renderer
- Load or create 3D models and textures
- Implement lighting and shaders
- Add physics and collision detection
- Implement player controls and camera movement
- Add audio and visual effects
Publishing a Game
- Optimize assets (compress images, minify code)
- Test across browsers and devices
- Choose distribution platform (web, app stores, game portals)
- Implement monetization if needed
- Promote through game communities and social media
Game Templates
Starter templates are available in the assets/ folder. Each template provides a complete, working example that can be used as a starting point for a new project.
| Template |
Description |
paddle-game-template.md |
2D Breakout-style game with pure JavaScript |
2d-maze-game.md |
Maze game with device orientation controls |
2d-platform-game.md |
Platformer game using Phaser framework |
gameBase-template-repo.md |
Game base template repository structure |
simple-2d-engine.md |
Simple 2D platformer engine with collisions |
Reference Documentation
Detailed reference material is available in the references/ folder. Consult these files for in-depth coverage of specific topics.
| Reference |
Topics Covered |
basics.md |
Game development introduction and anatomy |
web-apis.md |
Canvas, WebGL, Web Audio, Gamepad, and other web APIs |
techniques.md |
Collision detection, tilemaps, async scripts, audio |
3d-web-games.md |
3D theory, frameworks, shaders, WebXR |
game-control-mechanisms.md |
Touch, keyboard, mouse, and gamepad controls |
game-publishing.md |
Distribution, promotion, and monetization |
algorithms.md |
Raycasting, collision, physics, vector math |
terminology.md |
Game development glossary |
game-engine-core-principles.md |
Core design principles for game engines |
Troubleshooting
| Issue |
Solution |
| Canvas is blank |
Check that you are calling drawing methods after getting the context and inside the game loop |
| Game runs at different speeds |
Use delta time in update calculations instead of fixed values |
| Collision detection is inconsistent |
Use continuous collision detection or reduce time steps for fast-moving objects |
| Audio does not play |
Browsers require user interaction before playing audio; trigger playback from a click handler |
| Performance is poor |
Profile with browser dev tools, reduce draw calls, use object pooling, and optimize asset sizes |
| Touch controls are unresponsive |
Prevent default touch behavior and handle touch events separately from mouse events |
| WebGL context lost |
Handle the webglcontextlost event and restore state on webglcontextrestored |
1---2name: game-engine3description: building web-based game engines and games using HTML5, Canvas, WebGL, and JavaScript4---56# Game Engine Skill78Build web-based games and game engines using HTML5 Canvas, WebGL, and JavaScript. This skill includes starter templates, reference documentation, and step-by-step workflows for 2D and 3D game development with frameworks such as Phaser, Three.js, Babylon.js, and A-Frame.910## When to Use This Skill1112- Building a game engine or game from scratch using web technologies13- Implementing game loops, physics, collision detection, or rendering14- Working with HTML5 Canvas, WebGL, or SVG for game graphics15- Adding game controls (keyboard, mouse, touch, gamepad)16- Creating 2D platformers, breakout-style games, maze games, or 3D experiences17- Working with tilemaps, sprites, or animations18- Adding audio to web games19- Implementing multiplayer features with WebRTC or WebSockets20- Optimizing game performance21- Publishing and distributing web games2223## Prerequisites2425- Basic knowledge of HTML, CSS, and JavaScript26- A modern web browser with Canvas/WebGL support27- A text editor or IDE28- Optional: Node.js for build tooling and local development servers2930## Core Concepts3132The following concepts form the foundation of every web-based game engine.3334### Game Loop3536Every game engine revolves around the game loop -- a continuous cycle of:37381. **Process Input** - Read keyboard, mouse, touch, or gamepad input392. **Update State** - Update game object positions, physics, AI, and logic403. **Render** - Draw the current game state to the screen4142Use `requestAnimationFrame` for smooth, browser-optimized rendering.4344### Rendering4546- **Canvas 2D** - Best for 2D games, sprite-based rendering, and tilemaps47- **WebGL** - Hardware-accelerated 3D and advanced 2D rendering48- **SVG** - Vector-based graphics, good for UI elements49- **CSS** - Useful for DOM-based game elements and transitions5051### Physics and Collision Detection5253- **2D Collision Detection** - AABB, circle, and SAT-based collision54- **3D Collision Detection** - Bounding box, bounding sphere, and raycasting55- **Velocity and Acceleration** - Basic Newtonian physics for movement56- **Gravity** - Constant downward acceleration for platformers5758### Controls5960- **Keyboard** - Arrow keys, WASD, and custom key bindings61- **Mouse** - Click, move, and pointer lock for FPS-style controls62- **Touch** - Mobile touch events and virtual joysticks63- **Gamepad** - Gamepad API for controller support6465### Audio6667- **Web Audio API** - Programmatic sound generation and spatial audio68- **HTML5 Audio** - Simple audio playback for music and sound effects6970## Step-by-Step Workflows7172### Creating a Basic 2D Game73741. Set up an HTML file with a `<canvas>` element752. Get the 2D rendering context763. Implement the game loop using `requestAnimationFrame`774. Create game objects with position, velocity, and size properties785. Handle keyboard/mouse input for player control796. Implement collision detection between game objects807. Add scoring, lives, and win/lose conditions818. Add sound effects and music8283### Building a 3D Game84851. Choose a framework (Three.js, Babylon.js, A-Frame, or PlayCanvas)862. Set up the scene, camera, and renderer873. Load or create 3D models and textures884. Implement lighting and shaders895. Add physics and collision detection906. Implement player controls and camera movement917. Add audio and visual effects9293### Publishing a Game94951. Optimize assets (compress images, minify code)962. Test across browsers and devices973. Choose distribution platform (web, app stores, game portals)984. Implement monetization if needed995. Promote through game communities and social media100101## Game Templates102103Starter templates are available in the `assets/` folder. Each template provides a complete, working example that can be used as a starting point for a new project.104105| Template | Description |106|----------|-------------|107| `paddle-game-template.md` | 2D Breakout-style game with pure JavaScript |108| `2d-maze-game.md` | Maze game with device orientation controls |109| `2d-platform-game.md` | Platformer game using Phaser framework |110| `gameBase-template-repo.md` | Game base template repository structure |111| `simple-2d-engine.md` | Simple 2D platformer engine with collisions |112113## Reference Documentation114115Detailed reference material is available in the `references/` folder. Consult these files for in-depth coverage of specific topics.116117| Reference | Topics Covered |118|-----------|---------------|119| `basics.md` | Game development introduction and anatomy |120| `web-apis.md` | Canvas, WebGL, Web Audio, Gamepad, and other web APIs |121| `techniques.md` | Collision detection, tilemaps, async scripts, audio |122| `3d-web-games.md` | 3D theory, frameworks, shaders, WebXR |123| `game-control-mechanisms.md` | Touch, keyboard, mouse, and gamepad controls |124| `game-publishing.md` | Distribution, promotion, and monetization |125| `algorithms.md` | Raycasting, collision, physics, vector math |126| `terminology.md` | Game development glossary |127| `game-engine-core-principles.md` | Core design principles for game engines |128129## Troubleshooting130131| Issue | Solution |132|-------|----------|133| Canvas is blank | Check that you are calling drawing methods after getting the context and inside the game loop |134| Game runs at different speeds | Use delta time in update calculations instead of fixed values |135| Collision detection is inconsistent | Use continuous collision detection or reduce time steps for fast-moving objects |136| Audio does not play | Browsers require user interaction before playing audio; trigger playback from a click handler |137| Performance is poor | Profile with browser dev tools, reduce draw calls, use object pooling, and optimize asset sizes |138| Touch controls are unresponsive | Prevent default touch behavior and handle touch events separately from mouse events |139| WebGL context lost | Handle the `webglcontextlost` event and restore state on `webglcontextrestored` |
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