package test;


import java.awt.GraphicsDevice;

import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.awt.GLCanvas;
import javax.media.opengl.glu.GLU;
import javax.swing.JFrame;

import com.sun.opengl.util.FPSAnimator;
import com.sun.opengl.util.gl2.GLUT;

public class Test extends JFrame implements GLEventListener{
	// When is the last time we measured? 
	long lastMeasure = 0; 
	int frameCounter = 0; 
	float fps = 0; 
	
	GLUT glut = new GLUT();
	
    public static void main(String[] args) {
    	new Test(); 
    }
    
    public Test(){
        super( "hey ho!" ); 
        setSize( 300, 300 ); 
        setDefaultCloseOperation( EXIT_ON_CLOSE ); 
        setUndecorated( true ); 
        
        //GraphicsDevice device = getGraphicsConfiguration().getDevice(); 
        //device.setFullScreenWindow( this ); 
        
        final GLCanvas canvas = new GLCanvas();
        canvas.addGLEventListener( this ); 
        getContentPane().add( canvas );

        
        setVisible( true );
    }

	@Override
	public void display( GLAutoDrawable drawable ){
		frameCounter ++; 
		
		if( System.currentTimeMillis() - lastMeasure > 1000 ){
			fps = frameCounter * 1000f / ( System.currentTimeMillis() - lastMeasure ); 
			lastMeasure = System.currentTimeMillis(); 
			frameCounter = 0; 
			
			System.out.println( fps ); 
		}
		
		GL2 gl = drawable.getGL().getGL2();
		gl.glLoadIdentity();  
		gl.glClearColor( 0, 0, 0, 1 );
		gl.glClear( GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT );
		
		gl.setSwapInterval( 0 ); 
		gl.glColor3f( 1, 1, 1 ); 
		gl.glRasterPos2i( 0, 0 ); 
		glut.glutBitmapString( GLUT.BITMAP_8_BY_13, fps + " fps" ); 
	}

	// All the code from here on is just annoying boilerplate. 
	@Override
	public void init( final GLAutoDrawable drawable ){
		System.out.println( "Init!" );
		GL2 gl = drawable.getGL().getGL2();
		
        gl.glShadeModel( GL2.GL_SMOOTH );
        gl.glClearDepth( 1.0 );
        gl.glDepthFunc( GL.GL_LEQUAL );
        gl.glEnable( GL.GL_DEPTH_TEST );
        gl.glHint( GL2.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST );
        
        gl.setSwapInterval( 0 ); 
        FPSAnimator animator = new FPSAnimator( drawable, 1000 );
        animator.start(); 
        
        // Also doesn't work: 
        // Animator animator2 = new Animator( drawable ); 
        // animator2.setRunAsFastAsPossible( true ); 
        // animator2.start();
	}

	@Override
	public void reshape( GLAutoDrawable drawable, int x, int y, int width, int height ){
		GL2 gl = drawable.getGL().getGL2();
		GLU glu = new GLU(); 
        gl.glViewport( 0, 0, width, height );
        gl.glMatrixMode( GL2.GL_PROJECTION );
        gl.glLoadIdentity();
        glu.gluPerspective( 45.0f, 0, 0.1f, 1000.0f);
        gl.glMatrixMode( GL2.GL_MODELVIEW );
        gl.glLoadIdentity(); 
        gl.setSwapInterval( 0 ); 
	}

	@Override
	public void dispose(GLAutoDrawable arg0) {
		// TODO Auto-generated method stub
	}
}