Book Image

SDL Game Development

By : Shaun Mitchell
5 (1)
Book Image

SDL Game Development

5 (1)
By: Shaun Mitchell

Overview of this book

SDL 2.0 is the latest release of the popular Simple DirectMedia Layer API, which is designed to make life easier for C++ developers, allowing you simple low-level access to various multiplatform audio, graphics, and input devices.SDL Game Development guides you through creating your first 2D game using SDL and C++. It takes a clear and practical approach to SDL game development, ensuring that the focus remains on creating awesome games.Starting with the installation and setup of SDL, you will quickly become familiar with useful SDL features, covering sprites, state management, and OOP, leading to a reusable framework that is extendable for your own games. SDL Game Development culminates in the development of two exciting action games that utilize the created framework along with tips to improve the framework.
Table of Contents (16 chapters)
SDL Game Development
About the Author
About the Reviewers

Implementing finite state machines

What we really need is the ability to define our states outside the game class, and have the state itself take care of what it needs to load, render, and update. For this we can create what is known as an FSM. The definition of FSM, as we will use it, is a machine that can exist in a finite number of states, can exist in only one state at a time (known as the current state), and can change from one state to another (known as a transition).

A base class for game states

Let's start our implementation by creating a base class for all of our states; create a header file called GameState.h:

class GameState
  virtual void update() = 0;
  virtual void render() = 0;

  virtual bool onEnter() = 0;
  virtual bool onExit() = 0;

  virtual std::string getStateID() const = 0;

Just like our GameObject class, this is an abstract base class; we aren't actually putting any functionality into it, we just want all of our derived classes to...