package net.mitchtech.ioio;

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

import javax.microedition.khronos.opengles.GL10;

public class SnowCube
{
	private FloatBuffer m_vertexBuffer;
	private FloatBuffer m_colorBuffer;
	private ByteBuffer  m_indexBuffer;
	
	// »ï°¢Çü ÁÂÇ¥ ÀÔ·Â
	private float vertices[] = {-1.0f, -1.0f, -0.3f,
					            1.0f, -1.0f, -0.3f,	
					            1.0f,  1.0f, -0.3f,	
					            -1.0f, 1.0f, -0.3f,	
					            -1.0f, -1.0f,  0.3f,
					            1.0f, -1.0f,  0.3f,	
					            1.0f,  1.0f,  0.3f,	
					            -1.0f,  1.0f,  0.3f,};	
	
	
	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 SnowCube() 
	{
		ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4);
		byteBuf.order(ByteOrder.nativeOrder());
		m_vertexBuffer = byteBuf.asFloatBuffer();
		m_vertexBuffer.put(vertices);
		m_vertexBuffer.position(0);
		
		byteBuf = ByteBuffer.allocateDirect(colors.length * 4);
		byteBuf.order(ByteOrder.nativeOrder());
		m_colorBuffer = byteBuf.asFloatBuffer();
		m_colorBuffer.put(colors);
		m_colorBuffer.position(0);
		
		m_indexBuffer = ByteBuffer.allocateDirect(indices.length);
		m_indexBuffer.put(indices);
		m_indexBuffer.position(0);
	}
	
	public void draw(GL10 gl) 
	{
		gl.glFrontFace(GL10.GL_CW);		// ½Ã°è¹æÇ⠱׸®±â ¼³Á¤
		
		// VertexPointer ¹× ColorPointer ¼³Á¤
		gl.glVertexPointer(3, GL10.GL_FLOAT, 0, m_vertexBuffer);
		gl.glColorPointer(4, GL10.GL_FLOAT, 0, m_colorBuffer);
		
		// Vertex Array ¹× Color Array »ç¿ë °¡´ÉÇϵµ·Ï ¼³Á¤
		gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
		gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
		
		// »ï°¢Çü Strip ±×¸®±â
		gl.glDrawElements(GL10.GL_TRIANGLES, indices.length, GL10.GL_UNSIGNED_BYTE, m_indexBuffer);
		
		// Vertex Array ¹× Color Array »ç¿ë »óŸ¦ ´Ù½Ã ºÒ°¡´ÉÇϵµ·Ï ¼³Á¤
		gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
		gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
	}
}