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/*
* 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
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*/
package net.java.joglutils.msg.elements;
import net.java.joglutils.msg.misc.State;
import net.java.joglutils.msg.misc.StateIndex;
/** Represents the depth test state of the OpenGL fixed-function pipeline. */
public class DepthTestElement extends Element {
// Boilerplate
private static StateIndex index = State.registerElementType();
public StateIndex getStateIndex() { return index; }
public Element newInstance() {
return new DepthTestElement();
}
/** Returns the instance of this element in the passed State. */
public static DepthTestElement getInstance(State state) {
return (DepthTestElement) 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) {
DepthTestElement tmp = new DepthTestElement();
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);
}
// TODO: eventually we'll want to add other state associated with
// depth testing, such as the the depth function and values
protected boolean enabled;
/** Sets the depth test state. */
public static void set(State state, boolean enabled) {
getInstance(state).setElt(enabled);
}
/** Returns whether depth testing is enabled. */
public static boolean getEnabled(State state) {
return getInstance(state).enabled;
}
public void push(State state) {
DepthTestElement prev = (DepthTestElement) getNextInStack();
if (prev != null) {
// Pull down the data from the previous element
enabled = prev.enabled;
}
}
/** Sets all of the portions of the depth test state in this element. */
public void setElt(boolean enabled) {
this.enabled = enabled;
}
}
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