/*
 * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * 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
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * 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.FloatBuffer;

import net.java.joglutils.msg.misc.State;
import net.java.joglutils.msg.misc.StateIndex;

/** Represents the current set of texture coordinates, which are
    applied on a per-vertex basis to any drawn geometry. */

public class TextureCoordinateElement extends Element {
  // Boilerplate
  private static StateIndex index = State.registerElementType();
  public StateIndex getStateIndex() { return index; }
  public Element newInstance() {
    return new TextureCoordinateElement();
  }
  /** Returns the instance of this element in the passed State. */
  public static TextureCoordinateElement getInstance(State state) {
    return (TextureCoordinateElement) state.getElement(index);
  }
  /** Enables this element in the passed state, which should be the
      default for a given action. */
  public static void enable(State defaultState) {
    TextureCoordinateElement tmp = new TextureCoordinateElement();
    defaultState.setElement(tmp.getStateIndex(), tmp);
  }
  /** Indicates whether this element is enabled in the given default
      state for a particular action. */
  public static boolean isEnabled(State state) {
    return (state.getDefaults().getElement(index) != null);
  }

  // The actual coordinate data
  protected FloatBuffer coords;

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

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

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

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