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package com.badlogic.gamedev.samples;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import javax.microedition.khronos.opengles.GL10;

import android.os.Bundle;

import com.badlogic.gamedev.tools.GameActivity;
import com.badlogic.gamedev.tools.GameListener;

/**
 * Example showing how to use vertex arrays to draw a
 * simple triangle with OpenGL ES.
 * 
 * @author mzechner
 *
 */
public class TriangleSample extends GameActivity implements GameListener 
{
	private FloatBuffer vertices;
	
	public void onCreate( Bundle savedInstance )
	{
		super.onCreate( savedInstance );
		setGameListener( this );
	}

	
	@Override
	public void setup(GameActivity activity, GL10 gl) 
	{
		ByteBuffer buffer = ByteBuffer.allocateDirect( 3 * 4 * 3 );
		buffer.order(ByteOrder.nativeOrder());
		vertices = buffer.asFloatBuffer();
		
		vertices.put( -0.5f );
		vertices.put( -0.5f );
		vertices.put( 0 );
		
		vertices.put( 0.5f );
		vertices.put( -0.5f );
		vertices.put( 0 );
		
		vertices.put( 0 );
		vertices.put( 0.5f );
		vertices.put( 0 );
		
		vertices.position(0);			
	}
	
	@Override
	public void mainLoopIteration(GameActivity activity, GL10 gl) 
	{	
		gl.glViewport(0, 0, getViewportWidth(), getViewportHeight());
		gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
		gl.glEnableClientState(GL10.GL_VERTEX_ARRAY );    
		gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertices);
		gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3);
	}
	
}