Android NDK Beginner's Guide - Second Edition

Time for action – initializing OpenGL ES

Let's now see how to implement a sprite batch in DroidBlaster:

1. Modify jni/GraphicsManager.hpp. Create the class GraphicsComponent, which defines a common interface for all rendering techniques starting with sprite batches. Define a few new methods such as:
   • getProjectionMatrix() which provides an OpenGL matrix to project 2D graphics on screen
   • loadShaderProgram() to load a vertex and fragment shader and link them together into an OpenGL program
   • registerComponent() which records a list of GraphicsComponent to initialize and render

   Create the RenderVertex private structure representing the structure of an individual sprite vertex.

   Also, declare a few new member variables such as:

   • mProjectionMatrix to store an orthographic ...