Cube.java

package com.marcodinacci.android.commons.opengl;

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

import javax.microedition.khronos.opengles.GL10;

public class Cube {
	
	private FloatBuffer mVertexBuffer;
	private FloatBuffer mColorBuffer;
	private ByteBuffer  mIndexBuffer;
	
	private float vertices[] = {
			            -1.0f, -1.0f, -1.0f,
			            1.0f, -1.0f, -1.0f,
			            1.0f,  1.0f, -1.0f,
			            -1.0f, 1.0f, -1.0f,
			            -1.0f, -1.0f,  1.0f,
			            1.0f, -1.0f,  1.0f,
			            1.0f,  1.0f,  1.0f,
			            -1.0f,  1.0f,  1.0f
			    		};
    
	private float colors[] = {
			            0.0f,  1.0f,  0.0f,  1.0f,
			            0.0f,  1.0f,  0.0f,  1.0f,
			            1.0f,  0.5f,  0.0f,  1.0f,
			            1.0f,  0.5f,  0.0f,  1.0f,
			            1.0f,  0.0f,  0.0f,  1.0f,
			            1.0f,  0.0f,  0.0f,  1.0f,
			            0.0f,  0.0f,  1.0f,  1.0f,
			            1.0f,  0.0f,  1.0f,  1.0f
			    		};
   
	private byte indices[] = {
			            0, 4, 5, 0, 5, 1,
			            1, 5, 6, 1, 6, 2,
			            2, 6, 7, 2, 7, 3,
			            3, 7, 4, 3, 4, 0,
			            4, 7, 6, 4, 6, 5,
			            3, 0, 1, 3, 1, 2
						};
		
	public Cube() {
		ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4);
		byteBuf.order(ByteOrder.nativeOrder());
		mVertexBuffer = byteBuf.asFloatBuffer();
		mVertexBuffer.put(vertices);
		mVertexBuffer.position(0);
		
		byteBuf = ByteBuffer.allocateDirect(colors.length * 4);
		byteBuf.order(ByteOrder.nativeOrder());
		mColorBuffer = byteBuf.asFloatBuffer();
		mColorBuffer.put(colors);
		mColorBuffer.position(0);
		
		mIndexBuffer = ByteBuffer.allocateDirect(indices.length);
		mIndexBuffer.put(indices);
		mIndexBuffer.position(0);
	}

	public void draw(GL10 gl) {		
		gl.glFrontFace(GL10.GL_CW);
		
		gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVertexBuffer);
		gl.glColorPointer(4, GL10.GL_FLOAT, 0, mColorBuffer);
		
		gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
		gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
		
		gl.glDrawElements(GL10.GL_TRIANGLES, 36, GL10.GL_UNSIGNED_BYTE, 
				mIndexBuffer);
		
		gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
		gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
	}
}