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/*
 * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

package javax.media.j3d;

import java.util.ArrayList;

import javax.vecmath.Color3f;

/**
 * The LinearFog leaf node defines distance parameters for
 * linear fog.
 */
class LinearFogRetained extends FogRetained {
    /**
     * Fog front and back   distance
     */
    private double frontDistance = 0.1;
    private double backDistance = 1.0;
    private double frontDistanceInEc;
    private double backDistanceInEc;

    // dirty bits for LinearFog
    static final int FRONT_DISTANCE_CHANGED	= FogRetained.LAST_DEFINED_BIT << 1;
    static final int BACK_DISTANCE_CHANGED	= FogRetained.LAST_DEFINED_BIT << 2;

    LinearFogRetained() {
        this.nodeType = NodeRetained.LINEARFOG;
    }

    /**
     * Initializes front  distance for fog before the object is live
     */
    void initFrontDistance(double frontDistance){
	this.frontDistance = frontDistance;
    }

    /**
     * Sets front   distance for fog and sends a message
     */
    void setFrontDistance(double frontDistance){
	this.frontDistance = frontDistance;
	J3dMessage createMessage = new J3dMessage();
	createMessage.threads = targetThreads;
	createMessage.type = J3dMessage.FOG_CHANGED;
	createMessage.universe = universe;
	createMessage.args[0] = this;
	createMessage.args[1]= new Integer(FRONT_DISTANCE_CHANGED);
	createMessage.args[2] = new Double(frontDistance);
	VirtualUniverse.mc.processMessage(createMessage);

    }

    /**
     * Gets front   distance for fog
     */
    double getFrontDistance(){
	return this.frontDistance;
    }

    /**
     * Initializes back   distance for fog
     */
    void initBackDistance(double backDistance){
	this.backDistance = backDistance;
    }
    /**
     * Sets back  distance for fog
     */
    void setBackDistance(double backDistance){
	this.backDistance = backDistance;
	J3dMessage createMessage = new J3dMessage();
	createMessage.threads = targetThreads;
	createMessage.type = J3dMessage.FOG_CHANGED;
	createMessage.universe = universe;
	createMessage.args[0] = this;
	createMessage.args[1]= new Integer(BACK_DISTANCE_CHANGED);
	createMessage.args[2] = new Double(backDistance);
	VirtualUniverse.mc.processMessage(createMessage);
    }

    /**
     * Gets back   distance for fog
     */
    double getBackDistance(){
	return this.backDistance;
    }
    /**
     * This method and its native counterpart update the native context
     * fog values.
     */
    @Override
    void update(Context ctx, double scale) {
	validateDistancesInEc(scale);
	Pipeline.getPipeline().updateLinearFog(ctx,
                color.x, color.y, color.z, frontDistanceInEc, backDistanceInEc);
    }



    @Override
    void setLive(SetLiveState s) {
	super.setLive(s);

	// Initialize the mirror object, this needs to be done, when
	// renderBin is not accessing any of the fields
	J3dMessage createMessage = new J3dMessage();
	createMessage.threads = J3dThread.UPDATE_RENDERING_ENVIRONMENT;
	createMessage.universe = universe;
	createMessage.type = J3dMessage.FOG_CHANGED;
	createMessage.args[0] = this;
	// a snapshot of all attributes that needs to be initialized
	// in the mirror object
	createMessage.args[1]= new Integer(INIT_MIRROR);
	ArrayList addScopeList = new ArrayList();
	for (int i = 0; i < scopes.size(); i++) {
		GroupRetained group = scopes.get(i);
	    tempKey.reset();
	    group.addAllNodesForScopedFog(mirrorFog, addScopeList, tempKey);
	}
	Object[] scopeInfo = new Object[2];
	scopeInfo[0] = ((scopes.size() > 0) ? Boolean.TRUE:Boolean.FALSE);
	scopeInfo[1] = addScopeList;
	createMessage.args[2] = scopeInfo;
	Color3f clr = new Color3f(color);
	createMessage.args[3] = clr;

	Object[] obj = new Object[6];
	obj[0] = boundingLeaf;
	obj[1] = (regionOfInfluence != null?regionOfInfluence.clone():null);
	obj[2] = (inBackgroundGroup? Boolean.TRUE:Boolean.FALSE);
	obj[3] = geometryBackground;
	obj[4] = new Double(frontDistance);
	obj[5] = new Double(backDistance);

	createMessage.args[4] = obj;
	VirtualUniverse.mc.processMessage(createMessage);

    }


    // The update Object function.
    // Note : if you add any more fields here , you need to update
    // updateFog() in RenderingEnvironmentStructure
    @Override
    synchronized void updateMirrorObject(Object[] objs) {

	int component = ((Integer)objs[1]).intValue();

	if ((component & FRONT_DISTANCE_CHANGED) != 0)
	    ((LinearFogRetained)mirrorFog).frontDistance = ((Double)objs[2]).doubleValue();
	if ((component & BACK_DISTANCE_CHANGED) != 0)
	    ((LinearFogRetained)mirrorFog).backDistance = ((Double)objs[2]).doubleValue();
	if ((component & INIT_MIRROR) != 0) {
	    ((LinearFogRetained)mirrorFog).frontDistance = ((Double)((Object[])objs[4])[4]).doubleValue();
	    ((LinearFogRetained)mirrorFog).backDistance = ((Double)((Object[])objs[4])[5]).doubleValue();

	}
	((LinearFogRetained)mirrorFog).setLocalToVworldScale(getLastLocalToVworld().getDistanceScale());

	super.updateMirrorObject(objs);
    }

    /**
     * Scale distances from local to eye coordinate
     */
    @Override
    protected void validateDistancesInEc(double vworldToCoexistenceScale) {
        // vworldToCoexistenceScale can be used here since
        // CoexistenceToEc has a unit scale
        double localToEcScale = getLocalToVworldScale() * vworldToCoexistenceScale;

        frontDistanceInEc = frontDistance * localToEcScale;
        backDistanceInEc = backDistance * localToEcScale;
    }

}