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

Digression: helper routines

Here, we should describe a couple of functions used in control calculations.

In the preceding code, we used the ClampVec2() routine, which calculates the length of a vector V, compares this length to MaxValue, and returns either the same vector V or its clamped coaxial version of the MaxValue length:

inline vec2 ClampVec2(const vec2& V, float MaxValue)
  float L = V.Length();
  return (L > MaxValue) ? V.GetNormalized() * MaxValue : V;

Another bunch of methods include random number generation routines. The RandomFloat() method uses the C++11 standard library to generate uniformly distributed floating-point values in the 0…1 interval:

std::random_device rd;
std::mt19937 gen( rd() );
std::uniform_real_distribution<> dis( 0.0, 1.0 );
float RandomFloat()
  return static_cast<float>( dis( gen ) );

The RandomVec2Range() method uses the RandomFloat() function twice to return a vector with random components within a specified interval:

vec2 RandomVec2Range...