Android is booming like never before, with millions of devices shipping every day. It's never been a better time to learn how to create your own 3D games and live wallpaper for Android. You'll find out all about shaders and the OpenGL pipeline, and discover the power of OpenGL ES 2.0, which is much more feature-rich than its predecessor. If you can program in Java and you have a creative vision that you'd like to share with the world, then this is the book for you.
This book will teach you everything you need to know to create compelling graphics on Android. You'll learn the basics of OpenGL by building a simple game of air hockey, and along the way, you'll see how to initialize OpenGL and program the graphics pipeline using shaders. Each lesson builds upon the one before it, as you add colors, shading, 3D projections, touch interaction, and more.
Then, you'll find out how to turn your idea into a live wallpaper that can run on the home screen. You'll learn about more advanced effects involving particles, lighting models, and the depth buffer. You'll understand what to look for when debugging your program, and what to watch out for when deploying to the market.
OpenGL can be somewhat of a dark art to the uninitiated. As you read this book, you'll learn each new concept from first principles. You won't just learn about a feature; you'll also understand how it works, and why it works the way it does. Everything you learn is forward-compatible with the just-released OpenGL ES 3, and you can even apply these techniques to other platforms, such as iOS or HTML5 WebGL.
Printed in full color.
Author(s): Kevin Brothaler
Publisher: Pragmatic Bookshelf
Year: 2013
Language: English
Pages: 325
Cover
Table of Contents
Foreword
Acknowledgments
Welcome to OpenGL ES for Android!
What Will We Cover?
Who Should Read This book?
How to Read This Book
Conventions
Online Resources
Let's Get Started!
1. Getting Started
Installing the Tools
Creating Our First Program
Initializing OpenGL
Creating a Renderer Class
Using Static Imports
A Review
Part I—A Simple Game of Air Hockey
2. Defining Vertices and Shaders
Why Air Hockey?
Don't Start from Scratch
Defining the Structure of Our Air Hockey Table
Making the Data Accessible to OpenGL
Introducing the OpenGL Pipeline
The OpenGL Color Model
A Review
3. Compiling Shaders and Drawing to the Screen
Loading Shaders
Compiling Shaders
Linking Shaders Together into an OpenGL Program
Making the Final Connections
Drawing to the Screen
A Review
Exercises
4. Adding Color and Shade
Smooth Shading
Introducing Triangle Fans
Adding a New Color Attribute
Rendering with the New Color Attribute
A Review
Exercises
5. Adjusting to the Screen's Aspect Ratio
We Have an Aspect Ratio Problem
Working with a Virtual Coordinate Space
Linear Algebra 101
Defining an Orthographic Projection
Adding an Orthographic Projection
A Review
Exercises
6. Entering the Third Dimension
The Art of 3D
Transforming a Coordinate from the Shader to the Screen
Adding the W Component to Create Perspective
Moving to a Perspective Projection
Defining a Perspective Projection
Creating a Projection Matrix in Our Code
Switching to a Projection Matrix
Adding Rotation
A Review
Exercises
7. Adding Detail with Textures
Understanding Textures
Loading Textures into OpenGL
Creating a New Set of Shaders
Creating a New Class Structure for Our Vertex Data
Adding Classes for Our Shader Programs
Drawing Our Texture
A Review
Exercises
8. Building Simple Objects
Combining Triangle Strips and Triangle Fans
Adding a Geometry Class
Adding an Object Builder
Updating Our Objects
Updating Shaders
Integrating Our Changes
A Review
Exercises
9. Adding Touch Feedback: Interacting with Our Air Hockey Game
Adding Touch Support to Our Activity
Adding Intersection Tests
Moving Around an Object by Dragging
Adding Collision Detection
A Review and Wrap-Up
Exercises
Part II—Building a 3D World
10. Spicing Things Up with Particles
Creating a Set of Shaders for a Simple Particle System
Adding the Particle System
Drawing the Particle System
Spreading Out the Particles
Adding Gravity
Mixing the Particles with Additive Blending
Customizing the Appearance of Our Points
Drawing Each Point as a Sprite
A Review
Exercises
11. Adding a Skybox
Creating a Skybox
Loading a Cube Map into OpenGL
Creating a Cube
Adding a Skybox Shader Program
Adding the Skybox to Our Scene
Panning the Camera Around the Scene
A Review
Exercises
12. Adding Terrain
Creating a Height Map
Creating Vertex and Index Buffer Objects
Loading in the Height Map
Drawing the Height Map
Occluding Hidden Objects
A Review
Exercises
13. Lighting Up the World
Simulating the Effects of Light
Implementing a Directional Light with Lambertian Reflectance
Adding Point Lights
A Review
Exercises
14. Creating a Live Wallpaper
Implementing the Live Wallpaper Service
Playing Nicely with the Rest of the System
A Review
Exercises
15. Taking the Next Step
Looking Toward Other Platforms
Learning About More Advanced Techniques
Sharing Your Artistic Vision with the World
A1. The Matrix Math Behind the Projections
The Math Behind Orthographic Projections
The Math Behind Perspective Projections
A2. Debugging
Debugging with glGetError
Using Tracer for OpenGL ES
Pitfalls to Watch Out For
Bibliography
Index
– SYMBOLS –
– DIGITS –
– A –
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– G –
– H –
– I –
– J –
– L –
– M –
– N –
– O –
– P –
– Q –
– R –
– S –
– T –
– U –
– V –
– W –
– X –
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