package trvis.test;

import java.awt.BorderLayout;
import java.nio.FloatBuffer;

import javax.media.opengl.GL3;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.GLProfile;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;

import com.jogamp.common.nio.Buffers;

public class GlMapBufferTest extends GLCanvas implements GLEventListener {

	private int VBO = 0;

	public static void main(String[] args) {
		GLProfile.initSingleton();

		java.awt.EventQueue.invokeLater(new Runnable() {
			@Override
			public void run() {
				JFrame f = new JFrame("GlMapBuffer Test");
				f.setSize(100, 100);
				f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				f.getContentPane().setLayout(new BorderLayout());
				f.getContentPane().add(new GlMapBufferTest(), BorderLayout.CENTER);

				f.setVisible(true);
			}
		});
	}

	public GlMapBufferTest() {
		addGLEventListener(this);
	}

	@Override
	public void init(GLAutoDrawable glDrawable) {
		GL3 gl = glDrawable.getGL().getGL3();

		int handle[] = new int[1];
		gl.glGenBuffers(1, handle, 0);
		VBO = handle[0];

		// Create VBO for 3 float values
		gl.glBindBuffer(GL3.GL_ARRAY_BUFFER, VBO);
		gl.glBufferData(GL3.GL_ARRAY_BUFFER, 3 * Buffers.SIZEOF_FLOAT, null, GL3.GL_DYNAMIC_DRAW);
		gl.glBindBuffer(GL3.GL_ARRAY_BUFFER, 0);

	}

	@Override
	public void reshape(GLAutoDrawable glDrawable, int x, int y, int w, int h) {
	}

	@Override
	public void dispose(GLAutoDrawable glDrawable) {
		GL3 gl = glDrawable.getGL().getGL3();
		gl.glDeleteBuffers(1, new int[] { VBO }, 0);
	}

	@Override
	public void display(GLAutoDrawable glDrawable) {
		System.out.print("DISPLAY: ");
		long millis = System.currentTimeMillis();
		GL3 gl = glDrawable.getGL().getGL3();

		for (int i = 0; i < 100; i++) { // Map VBO 100 times
			gl.glBindBuffer(GL3.GL_ARRAY_BUFFER, VBO);
			FloatBuffer vboData = gl.glMapBuffer(GL3.GL_ARRAY_BUFFER, GL3.GL_WRITE_ONLY).asFloatBuffer();
			vboData.put(1).put(2).put(3);
			vboData.rewind();
			gl.glUnmapBuffer(GL3.GL_ARRAY_BUFFER);
			gl.glBindBuffer(GL3.GL_ARRAY_BUFFER, 0);
		}

		millis = System.currentTimeMillis() - millis;
		System.out.println(millis + "ms");
		System.out.flush();

		repaint(); // Refresh immediately
	}
}