public class Renderer implements GLEventListener
{
	private GLU glu = new GLU();
	private LinkedList<Entity> entities = new LinkedList<Entity>();

	public Renderer()
	{
		entities.add(new FloorEntity());
		//entities.add(new BlockEntity());
	}
	
	public void display(GLAutoDrawable gLDrawable)
	{
		final GL gl = gLDrawable.getGL();
		gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
		
		glu.gluLookAt(1.0, 1.0, 1.0,
					  0.0, 0.0, 0.0,
					  0.0, 1.0, 0.0);
		
		for (Entity e : entities)
		{
			e.render(gl);
		}
	}

	public void init(GLAutoDrawable gLDrawable)
	{
		GL gl = gLDrawable.getGL();
		gl.glShadeModel(GL.GL_SMOOTH);
		gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
		
		float[] specular = new float[] {1.0f, 1.0f, 1.0f, 1.0f};
		gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE, specular, 0);
		
		float[] position = new float[] {2.0f, 2.0f, -2.0f, 1.0f};
		gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, position, 1);
		
		gl.glEnable(GL.GL_LIGHTING);
		gl.glEnable(GL.GL_LIGHT0);
	}


	public void reshape(GLAutoDrawable gLDrawable, int x, int y, int width, int height)
	{
		final GL gl = gLDrawable.getGL();

		if (height <= 0) { height = 1; } // avoid a divide by zero error!
		final float h = (float) width / (float) height;
		gl.glViewport(0, 0, width, height);
		
		gl.glMatrixMode(GL.GL_PROJECTION);
		gl.glLoadIdentity();
		
		gl.glMatrixMode(GL.GL_MODELVIEW);
		gl.glLoadIdentity();
	}
}