Book Image

Mastering Android NDK

Book Image

Mastering Android NDK

Overview of this book

Android NDK is used for multimedia applications that require direct access to system resources. NDK is also the key for portability, which in turn allows a reasonably comfortable development and debugging process using familiar tools such as GCC and Clang toolchains. This is a hands-on guide to extending your game development skills with Android NDK. The book takes you through many clear, step-by-step example applications to help you further explore the features of Android NDK and some popular C++ libraries and boost your productivity by debugging the development process. Through the course of this book, you will learn how to write portable multi-threaded native code, use HTTP networking in C++, play audio files, use OpenGL ES 3, and render high-quality text. Each chapter aims to take you one step closer to building your application. By the end of this book, you will be able to create an engaging, complete gaming application.
Table of Contents (17 chapters)
Mastering Android NDK
About the Authors
About the Reviewers

Collective behaviors

By now, we have defined only the clWanderBehaviour class. To implement flocking algorithms, we need to store information about all the boids at once. Such a collection is called a Swarm here. The clSwarm class holds a vector of clBoid objects and implements a number of routines used in boid control calculations:

class clSwarm: public iIntrusiveCounter
  std::vector< clPtr<clBoid> > m_Boids;
  clSwarm() {}

For debugging and visual demonstration purposes, the GenerateRandom() method allocates a number of clBoid objects with random positions and zero velocities:

  void GenerateRandom( size_t N )
    m_Boids.reserve( N );
    for ( size_t i = 0; i != N; i++ )
      m_Boids.emplace_back( make_intrusive<clBoid>() );

By default, each boid has a Wandering behavior:

      m_Boids.back()->m_Behaviour = make_intrusive<clWanderBehaviour>();
      m_Boids.back()->m_Swarm = this;

Positions are random and are also kept within the -1..+1 range...