Android NDK Beginner`s Guide - Second Edition

Time for action – initializing OpenGL ES

Let's rewrite our GraphicsManager to initialize an OpenGL ES context:

1. Modify jni/GraphicsManager.hpp by performing the following:
   • Include EGL/egl.h to bind OpenGL ES to the Android platform and GLES2/gl2.h to render graphics
   • Add a method stop() to unbind the OpenGL rendering context and free graphics resources when you're leaving the activity
   • Define EGLDisplay, EGLSurface, and EGLContext member variables, which represent handles to system resources, as shown here:

     ...
     #include "Types.hpp"
     
     #include <android_native_app_glue.h>
     #include <GLES2/gl2.h>
     #include <EGL/egl.h>
     ...
     
     class GraphicsManager {
     public:
         ...
         status start();
         void stop(); status update(); private: ... int32_t mRenderWidth; int32_t mRenderHeight; ...