Game Development Patterns with Unity 2021: Explore practical game development using software design patterns and best practices in Unity and C#. 2 Ed

Cover....1

Title Page....2

Copyright and Credits....3

Dedication....4

Contributors....5

Table of Contents....7

Preface....12

Sections 1: Fundamentals....18

Chapter 1: Before We Begin....19

Notes about the new edition....19

The philosophy of the book....20

What are design patterns?....21

Which subjects aren't covered in this book?....21

The game project....22

Summary....23

Chapter 2: The Game Design Document....24

The design document....25

Game overview....25

Unique selling points....25

Minimum requirements....26

Game synopsis....26

Game objectives....27

Game rules....28

Game loop....28

Game environment....29

Camera, control, character (3Cs)....29

Camera....29

Character....30

Character description....30

Character metrics....31

Character states....31

Controller....32

Game ingredients....32

Superbikes....33

Pickups....33

Obstacles....34

Weaponry....34

Game systems....34

Game menu....36

Game HUD....36

Summary....37

Further reading....37

Chapter 3: A Short Primer to Programming in Unity....38

What you should already know....39

C# language features....39

Unity engine features ....43

Summary....45

Further reading....45

Section 2: Core Patterns....46

Chapter 4: Implementing a Game Manager with the Singleton....47

Technical requirements....48

Understanding the Singleton pattern....48

Benefits and drawbacks....50

Designing a Game Manager....50

Implementing the Game Manager....51

Testing the Game Manager....56

Summary....58

Chapter 5: Managing Character States with the State Pattern....59

Technical requirements....60

An overview of the State pattern....60

Defining character states....62

Implementing the State pattern....63

Implementing the State pattern....64

Testing the State pattern implementation....69

Benefits and drawbacks of the State pattern....70

Reviewing alternative solutions....72

Summary....73

Chapter 6: Managing Game Events with the Event Bus....74

Technical requirements....75

Understanding the Event Bus pattern....75

Benefits and drawbacks of the Event Bus pattern....77

When to use the Event Bus....78

Managing global race events....78

Implementing a Race Event Bus....79

Testing the Race Event Bus....81

Reviewing the Event Bus implementation....86

Reviewing some alternative solutions....87

Summary....87

Chapter 7: Implement a Replay System with the Command Pattern....88

Technical requirements....89

Understanding the Command pattern....89

Benefits and drawbacks of the Command pattern....92

When to use the Command pattern....92

Designing a replay system....93

Implementing a replay system....95

Implementing the replay system....95

Testing the replay system....99

Reviewing the implementation....103

Reviewing alternative solutions....104

Summary....104

Chapter 8: Optimizing with the Object Pool Pattern....105

Technical requirements....106

Understanding the Object Pool pattern....106

Benefits and drawbacks of the Object Pool pattern....107

When to use the Object Pool pattern....108

Implementing the Object Pool pattern....109

Steps for implementing the Object Pool pattern....109

Testing the Object Pool implementation....114

Reviewing the Object Pool implementation....116

Reviewing alternative solutions....116

Summary....116

Chapter 9: Decoupling Components with the Observer Pattern....117

Technical requirements....118

Understanding the Observer pattern....118

Benefits and drawbacks of the Observer pattern....119

When to use the Observer pattern....120

Decoupling core components with the Observer pattern....120

Implementing the Observer pattern....122

Testing the Observer pattern implementation....128

Reviewing alternative solutions....130

Summary....130

Chapter 10: Implementing Power-Ups with the Visitor Pattern....131

Technical requirements....132

Understanding the Visitor pattern....132

Benefits and drawbacks of the Visitor pattern....134

Designing a power-up mechanic....135

Implementing a power-up mechanic....136

Implementing the power-up system....136

Testing the power-up system implementation....142

Reviewing the power-up system implementation....144

Summary....145

Chapter 11: Implementing a Drone with the Strategy Pattern....146

Technical requirements....147

Understanding the Strategy pattern....147

Benefits and drawbacks of the Strategy pattern....148

When to use the Strategy pattern....149

Designing an enemy drone....150

Implementing an enemy drone....152

Steps to implementing an enemy drone....152

Testing the enemy drone implementation....157

Reviewing the enemy drone implementation....159

Reviewing alternative solutions....159

Summary....160

Chapter 12: Using the Decorator to Implement a Weapon System....161

Technical requirements....161

Understanding the Decorator pattern....162

Benefits and drawbacks of the Decorator pattern....163

When to use the Decorator pattern....164

Designing a weapon system....165

Implementing a weapon system....166

Implementing the weapon system....166

Testing the weapon system....173

Reviewing the weapon system....176

Reviewing alternative solutions....177

Summary....177

Chapter 13: Implementing a Level Editor with Spatial Partition....178

Technical requirements....179

Understanding the Spatial Partition pattern....179

When to use the Spatial Partition pattern....181

Designing a level editor....181

Implementing a level editor....184

Steps for implementing a level editor....184

Using the level editor....190

Reviewing the level-editor implementation....190

Reviewing alternative solutions....190

Summary....191

Section 3: Alternative Patterns....192

Chapter 14: Adapting Systems with an Adapter....193

Technical requirements....194

Understanding the Adapter pattern....194

Benefits and drawbacks of the Adapter pattern....196

When to use the Adapter pattern....197

Implementing the Adapter pattern....198

Implementing the Adapter pattern....198

Testing the Adapter pattern implementation....201

Summary....202

Chapter 15: Concealing Complexity with a Facade Pattern....203

Technical requirements....203

Understanding the Facade pattern....204

Benefits and drawbacks....205

Designing a bike engine....206

Implementing a bike engine....207

Testing the engine facade....212

Reviewing alternative solutions....213

Summary....213

Chapter 16: Managing Dependencies with the Service Locator Pattern....214

Technical requirements....215

Understanding the Service Locator pattern....215

Benefits and drawbacks of the Service Locator pattern....217

When to use the Service Locator pattern....217

Implementing a Service Locator pattern....218

Testing the Service Locator pattern....222

Reviewing alternative solutions....223

Summary....224

About Packt....225

Other Books You May Enjoy....226

Index....229

While writing this book, I realized that it was almost impossible to satisfy every potential reader's needs when it comes to game development. Game development is a diverse industry with many different platforms and genres, and each one has its own unique characteristics that cannot be covered in a single book. Therefore, I decided to focus on a specific audience: game programmers who are working on mobile or indie games using the Unity engine. These programmers are in the process of refactoring their code to make it more maintainable and scalable, and they have a basic understanding of the Unity engine and the C# language. Senior programmers working on larger-scale games may find some examples in this book to be limited, but they will still find valuable insights into the challenges they face in their own projects.Daily, however, the content of this book may offer another perspective on the use of design patterns in Unity. Therefore, feel free to skip any chapter if you are already familiar with the theory and would like to see how I have implemented a specific pattern.