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/*
 * Copyright (c) 2009-2021 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions 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 'jMonkeyEngine' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */
package com.jme3.water;

import com.jme3.math.Plane;
import com.jme3.math.Vector3f;
import com.jme3.renderer.Camera;
import com.jme3.util.TempVars;

/**
 *
 * @author Nehon
 */
public class WaterUtils {    
    /**
     * A private constructor to inhibit instantiation of this class.
     */
    private WaterUtils() {
    }

    public static void updateReflectionCam(Camera reflectionCam, Plane plane, Camera sceneCam){
        
        TempVars vars = TempVars.get();
        // temporary vectors for reflection cam orientation calculation:
        Vector3f sceneTarget =  vars.vect1;
        Vector3f  reflectDirection =  vars.vect2;
        Vector3f  reflectUp =  vars.vect3;
        Vector3f  reflectLeft = vars.vect4;
        Vector3f  camLoc = vars.vect5;
        camLoc = plane.reflect(sceneCam.getLocation(), camLoc);
        reflectionCam.setLocation(camLoc);
        reflectionCam.setFrustum(sceneCam.getFrustumNear(),
                sceneCam.getFrustumFar(),
                sceneCam.getFrustumLeft(),
                sceneCam.getFrustumRight(),
                sceneCam.getFrustumTop(),
                sceneCam.getFrustumBottom());
        reflectionCam.setParallelProjection(sceneCam.isParallelProjection());

        sceneTarget.set(sceneCam.getLocation()).addLocal(sceneCam.getDirection(vars.vect6));
        reflectDirection = plane.reflect(sceneTarget, reflectDirection);
        reflectDirection.subtractLocal(camLoc);

        sceneTarget.set(sceneCam.getLocation()).subtractLocal(sceneCam.getUp(vars.vect6));
        reflectUp = plane.reflect(sceneTarget, reflectUp);
        reflectUp.subtractLocal(camLoc);

        sceneTarget.set(sceneCam.getLocation()).addLocal(sceneCam.getLeft(vars.vect6));
        reflectLeft = plane.reflect(sceneTarget, reflectLeft);
        reflectLeft.subtractLocal(camLoc);

        reflectionCam.setAxes(reflectLeft, reflectUp, reflectDirection);

        vars.release();
    }
}