Android NDK Beginner's Guide - Second Edition

Time for action – adapting resolution with off-screen rendering

Let's render the game scene off-screen:

1. Change jni/GraphicsManager.hpp, followed by these steps:
   • Define new getter methods for the screen width and height with their corresponding member variables
   • Create a new function initializeRenderBuffer(), which creates an off-screen buffer to render the scene:

     ...
     class GraphicsManager {
     public:
         ...
         int32_t getRenderWidth() { return mRenderWidth; }s
         int32_t getRenderHeight() { return mRenderHeight; }
         int32_t getScreenWidth() { return mScreenWidth; }
         int32_t getScreenHeight() { return mScreenHeight; }
         GLfloat* getProjectionMatrix() { return mProjectionMatrix[0]; }
     
     ...

2. While still being in the same file, follow these steps:
   • Declare a new RenderVertex ...