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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.Mat4f;
import net.java.joglutils.msg.misc.State;
import net.java.joglutils.msg.misc.StateIndex;
/** Represents the viewing matrix, which contains the transformation
between the camera and the model. */
public class ViewingMatrixElement extends Element {
// Boilerplate
private static StateIndex index = State.registerElementType();
public StateIndex getStateIndex() { return index; }
public Element newInstance() {
return new ViewingMatrixElement();
}
/** Returns the instance of this element in the passed State. */
public static ViewingMatrixElement getInstance(State state) {
return (ViewingMatrixElement) 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) {
Element tmp = new ViewingMatrixElement();
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 matrix data
protected Mat4f matrix;
public ViewingMatrixElement() {
matrix = new Mat4f();
matrix.makeIdent();
}
/** Returns the current viewing matrix; callers should not mutate
this directly but instead use the accessor methods to change
it. */
public Mat4f getMatrix() {
return matrix;
}
public void push(State state) {
ViewingMatrixElement prev = (ViewingMatrixElement) getNextInStack();
if (prev != null) {
matrix.set(prev.matrix);
}
}
/** Sets the viewing matrix in the given state to the given one. */
public static void set(State state, Mat4f matrix) {
ViewingMatrixElement elt = getInstance(state);
elt.setElt(matrix);
}
/** Sets the viewing matrix in this element to the given one. */
public void setElt(Mat4f matrix) {
this.matrix.set(matrix);
}
}
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