/*
 * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
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 * modification, are permitted provided that the following conditions are
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 * - Redistribution in binary form must reproduce the above copyright
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 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
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 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
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package net.java.joglutils.msg.elements;

import java.nio.*;
import javax.media.opengl.*;

import net.java.joglutils.msg.misc.*;

/** Represents the current set of coordinates, which are assembled to
    draw geometry. */

public class CoordinateElement extends Element {
  // Boilerplate
  private static StateIndex index = State.registerElementType();
  public StateIndex getStateIndex() { return index; }
  public Element newInstance() {
    return new CoordinateElement();
  }
  public static CoordinateElement getInstance(State state) {
    return (CoordinateElement) state.getElement(index);
  }
  public static void enable(State defaultState) {
    CoordinateElement tmp = new CoordinateElement();
    defaultState.setElement(tmp.getStateIndex(), tmp);
  }

  // The actual coordinate data
  protected FloatBuffer coords;

  /** Sets the coordinate data in the passed state. */
  public static void set(State state, FloatBuffer coords) {
    getInstance(state).setElt(coords);
  }

  /** Returns the coordinate data in the passed state. */
  public static FloatBuffer get(State state) {
    return getInstance(state).coords;
  }

  public void push(State state) {
    CoordinateElement prev = (CoordinateElement) getNextInStack();
    if (prev != null) {
      // Pull down the data from the previous element
      coords = prev.coords;
    }
  }

  /** Sets the coordinate data in this element. */
  public void setElt(FloatBuffer coords) {
    this.coords = coords;
  }
}