GLSurfaceViewRenderer

GLSurfaceViewRenderer is a class that can be used to render content to a GLSurfaceView in Android. It is often used in conjunction with the GLSurfaceView.Renderer interface, which defines the methods that a renderer must implement.

The GLSurfaceView.Renderer interface has three main methods: onSurfaceCreated, onSurfaceChanged, and onDrawFrame.

onSurfaceCreated is called when the surface is created. This is where you should initialize your OpenGL ES components, such as setting the clear color and enabling depth testing.

onSurfaceChanged is called when the surface has changed size. This typically happens when the device is rotated. You should update your OpenGL ES viewport and projection matrix here to match the new surface dimensions.

onDrawFrame is called for each frame to be drawn. This is where you will perform your OpenGL ES drawing commands, such as clearing the screen, setting up camera matrices, and drawing your 3D objects.

A GLSurfaceViewRenderer can be set on a GLSurfaceView using the setRenderer method. The GLSurfaceView will then call the renderer's methods at the appropriate times to handle surface creation, changes, and frame drawing. This pattern allows for a clean separation of concerns, with the GLSurfaceView managing the EGL context and surface lifecycle, and the renderer handling the actual OpenGL ES rendering logic. Custom renderers can be implemented to display a wide range of graphical content, from simple shapes to complex 3D scenes.