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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.math.Vec4f;
import net.java.joglutils.msg.misc.State;
import net.java.joglutils.msg.misc.StateIndex;
import net.java.joglutils.msg.nodes.Blend;
/** Represents the blending state of the OpenGL fixed-function pipeline. */
public class BlendElement extends Element {
// Boilerplate
private static StateIndex index = State.registerElementType();
public StateIndex getStateIndex() { return index; }
public Element newInstance() {
return new BlendElement();
}
/** Returns the instance of this element in the passed State. */
public static BlendElement getInstance(State state) {
return (BlendElement) 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) {
BlendElement tmp = new BlendElement();
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);
}
// These defaults match those in the Blend node -- is there a better way of factoring them out?
// Whether blending is enabled
protected boolean enabled;
protected Vec4f blendColor = new Vec4f();
protected int srcFunc = Blend.ONE;
protected int destFunc = Blend.ZERO;
protected int blendEquation = Blend.FUNC_ADD;
/** Sets all of the portions of the blending state in the passed State object. */
public static void set(State state,
boolean enabled,
Vec4f blendColor,
int srcFunc,
int destFunc,
int blendEquation) {
getInstance(state).setElt(enabled,
blendColor,
srcFunc,
destFunc,
blendEquation);
}
/** Returns whether blending is enabled. */
public static boolean getEnabled(State state) {
return getInstance(state).enabled;
}
/** Returns the blending color. */
public static Vec4f getBlendColor(State state) {
return getInstance(state).blendColor;
}
/** Returns the source function for blending. */
public static int getSourceFunc(State state) {
return getInstance(state).srcFunc;
}
/** Returns the destination function for blending. */
public static int getDestFunc(State state) {
return getInstance(state).destFunc;
}
/** Returns the blending equation. */
public static int getBlendEquation(State state) {
return getInstance(state).blendEquation;
}
public void push(State state) {
BlendElement prev = (BlendElement) getNextInStack();
if (prev != null) {
// Pull down the data from the previous element
enabled = prev.enabled;
blendColor.set(prev.blendColor);
srcFunc = prev.srcFunc;
destFunc = prev.destFunc;
blendEquation = prev.blendEquation;
}
}
/** Sets all of the portions of the blending state in this element. */
public void setElt(boolean enabled,
Vec4f blendColor,
int srcFunc,
int destFunc,
int blendEquation) {
this.enabled = enabled;
this.blendColor.set(blendColor);
this.srcFunc = srcFunc;
this.destFunc = destFunc;
this.blendEquation = blendEquation;
}
}
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