Hello OpenGL

GLSurfaceView 를 상속받아 View 를 만드는 일.


GLSurfaceView.Renderer 를 상속받아 renderer 를 만드는 일.






--------------------------------------------------------------



import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

private GLSurfaceView mGLView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
   
        super.onCreate(savedInstanceState);       
        
        //setContentView(R.layout.activity_main);
        
        
        // Create a GLSurfaceView instance and set it
        // as the ContentView for this Activity.
        
        mGLView = new MyGLSurfaceView(this);
        setContentView( mGLView);        
        
    }
    

    @Override
    protected void onPause() {
   
        super.onPause();
        
        // The following call pauses the rendering thread.
        // If your OpenGL application is memory intensive,
        // you should consider de-allocating objects that
        // consume significant memory here.
        mGLView.onPause();
    }
    
    @Override
    protected void onResume() {
   
        super.onResume();
        
        // The following call resumes a paused rendering thread.
        // If you de-allocated graphic objects for onPause()
        // this is a good place to re-allocate them.
        mGLView.onResume();
    }    


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        // getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

--------------------------------------------------------------

import android.content.Context;

import android.opengl.GLSurfaceView;

public class MyGLSurfaceView extends GLSurfaceView {

public MyGLSurfaceView(Context context) {

super(context);

// Create an OpenGL ES 2.0 context

setEGLContextClientVersion(2);

// Set the Renderer for drawing on the GLSurfaceView

setRenderer( new MyRenderer());

// Render the view only when there is a change in the drawing data

setRenderMode( GLSurfaceView.RENDERMODE_WHEN_DIRTY);

}

}

--------------------------------------------------------------

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.opengles.GL10;

import android.opengl.GLES20;

import android.opengl.GLSurfaceView;

public class MyRenderer implements GLSurfaceView.Renderer {

@Override

public void onSurfaceCreated(GL10 gl, EGLConfig config) {

// Set the background frame color

GLES20.glClearColor( 1.0f, 0.0f, 0.0f, 1.0f);

}

@Override

public void onDrawFrame(GL10 gl) {

// Redraw background color

GLES20.glClear( GLES20.GL_COLOR_BUFFER_BIT );

}

@Override

public void onSurfaceChanged(GL10 gl, int width, int height) {

GLES20.glViewport( 0, 0, width, height);

}

}